Release v0.31.3

Maintainance of mapnik seems to have stalled, no ARM64 support
Memory requirements of Tensorflow too high, hangs/crashes on AMD64

.circleci/config.yml

@@ -0,0 +1,79 @@
+version: 2.1
+
+workflows:
+  build:
+    jobs:
+      - linux-arm64-glibc-node-14:
+          filters:
+            tags:
+              only: /^v.*/
+      - linux-arm64-musl-node-14:
+          filters:
+            tags:
+              only: /^v.*/
+      - linux-arm64-glibc-node-18:
+          filters:
+            tags:
+              only: /^v.*/
+      - linux-arm64-musl-node-18:
+          filters:
+            tags:
+              only: /^v.*/
+
+jobs:
+  linux-arm64-glibc-node-14:
+    resource_class: arm.medium
+    machine:
+      image: ubuntu-2004:current
+    steps:
+      - checkout
+      - run: |
+          sudo docker run -dit --name sharp --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp arm64v8/debian:bullseye
+          sudo docker exec sharp sh -c "apt-get update && apt-get install -y build-essential git python3 curl fonts-noto-core"
+          sudo docker exec sharp sh -c "curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -"
+          sudo docker exec sharp sh -c "echo 'deb https://deb.nodesource.com/node_14.x sid main' >/etc/apt/sources.list.d/nodesource.list"
+          sudo docker exec sharp sh -c "apt-get update && apt-get install -y nodejs"
+      - run: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
+      - run: sudo docker exec sharp sh -c "npm test"
+      - run: "[[ -n $CIRCLE_TAG ]] && sudo docker exec --env prebuild_upload sharp sh -c \"npx prebuild --runtime napi --target 7 --upload=$prebuild_upload\" || true"
+  linux-arm64-glibc-node-18:
+    resource_class: arm.medium
+    machine:
+      image: ubuntu-2004:current
+    steps:
+      - checkout
+      - run: |
+          sudo docker run -dit --name sharp --workdir /mnt/sharp arm64v8/debian:bullseye
+          sudo docker exec sharp sh -c "apt-get update && apt-get install -y build-essential git python3 curl fonts-noto-core"
+          sudo docker exec sharp sh -c "curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -"
+          sudo docker exec sharp sh -c "echo 'deb https://deb.nodesource.com/node_18.x sid main' >/etc/apt/sources.list.d/nodesource.list"
+          sudo docker exec sharp sh -c "apt-get update && apt-get install -y nodejs"
+          sudo docker exec sharp sh -c "mkdir -p /mnt/sharp"
+          sudo docker cp . sharp:/mnt/sharp/.
+      - run: sudo docker exec sharp sh -c "npm install --build-from-source"
+      - run: sudo docker exec sharp sh -c "npm test"
+  linux-arm64-musl-node-14:
+    resource_class: arm.medium
+    machine:
+      image: ubuntu-2004:current
+    steps:
+      - checkout
+      - run: |
+          sudo docker run -dit --name sharp --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:14-alpine3.12
+          sudo docker exec sharp sh -c "apk add build-base git python3 font-noto --update-cache"
+      - run: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
+      - run: sudo docker exec sharp sh -c "npm test"
+      - run: "[[ -n $CIRCLE_TAG ]] && sudo docker exec --env prebuild_upload sharp sh -c \"npx prebuild --runtime napi --target 7 --upload=$prebuild_upload\" || true"
+  linux-arm64-musl-node-18:
+    resource_class: arm.medium
+    machine:
+      image: ubuntu-2004:current
+    steps:
+      - checkout
+      - run: |
+          sudo docker run -dit --name sharp --workdir /mnt/sharp node:18-alpine3.14
+          sudo docker exec sharp sh -c "apk add build-base git python3 font-noto --update-cache"
+          sudo docker exec sharp sh -c "mkdir -p /mnt/sharp"
+          sudo docker cp . sharp:/mnt/sharp/.
+      - run: sudo docker exec sharp sh -c "npm install --build-from-source"
+      - run: sudo docker exec sharp sh -c "npm test"

.cirrus.yml

@@ -0,0 +1,16 @@
+freebsd_instance:
+  image_family: freebsd-14-0-snap
+
+task:
+  name: FreeBSD
+  env:
+    IGNORE_OSVERSION: yes
+  skip_notifications: true
+  prerequisites_script:
+    - pkg update -f
+    - pkg upgrade -y
+    - pkg install -y devel/pkgconf graphics/vips www/node16 www/npm
+  install_script:
+    - npm install --build-from-source --unsafe-perm
+  test_script:
+    - npm test

.github/CONTRIBUTING.md

@@ -12,47 +12,45 @@ New bugs are assigned a `triage` label whilst under investigation.
 
 ## Submit a new feature request
 
-If a [similar request](https://github.com/lovell/sharp/labels/enhancement) exists, it's probably fastest to add a comment to it about your requirement.
+If a [similar request](https://github.com/lovell/sharp/labels/enhancement) exists,
+it's probably fastest to add a comment to it about your requirement.
 
-Implementation is usually straightforward if _libvips_ [already supports](https://jcupitt.github.io/libvips/API/current/) the feature you need.
+Implementation is usually straightforward if libvips
+[already supports](https://www.libvips.org/API/current/func-list.html)
+the feature you need.
 
 ## Submit a Pull Request to fix a bug
 
 Thank you! To prevent the problem occurring again, please add unit tests that would have failed.
 
-Please select the `master` branch as the destination for your Pull Request so your fix can be included in the next minor release.
+Please select the `main` branch as the destination for your Pull Request so your fix can be included in the next minor release.
 
-Please squash your changes into a single commit using a command like `git rebase -i upstream/master`.
+Please squash your changes into a single commit using a command like `git rebase -i upstream/main`.
 
-To test C++ changes, you can compile the module using `npm install` and then run the tests using `npm test`.
+To test C++ changes, you can compile the module using `npm install --build-from-source` and then run the tests using `npm test`.
 
 ## Submit a Pull Request with a new feature
 
-Please add JavaScript [unit tests](https://github.com/lovell/sharp/tree/master/test/unit) to cover your new feature.
+Please add JavaScript [unit tests](https://github.com/lovell/sharp/tree/main/test/unit) to cover your new feature.
 A test coverage report for the JavaScript code is generated in the `coverage/lcov-report` directory.
 
 Where possible, the functional tests use gradient-based perceptual hashes
 based on [dHash](http://www.hackerfactor.com/blog/index.php?/archives/529-Kind-of-Like-That.html)
 to compare expected vs actual images.
 
-You deserve to add your details to the [list of contributors](https://github.com/lovell/sharp/blob/master/package.json#L5).
+You deserve to add your details to the [list of contributors](https://github.com/lovell/sharp/blob/main/package.json#L5).
 
 Any change that modifies the existing public API should be added to the relevant work-in-progress branch for inclusion in the next major release.
 
-| Release | WIP branch |
-| ------: | :--------- |
-| v0.21.0 | teeth      |
-| v0.22.0 | uptake     |
-
 Please squash your changes into a single commit using a command like `git rebase -i upstream/<wip-branch>`.
 
 ### Add a new public method
 
-The API tries to be as fluent as possible. Image processing concepts follow the naming conventions from _libvips_ and, to a lesser extent, _ImageMagick_.
+The API tries to be as fluent as possible.
+Image processing concepts follow the naming conventions from libvips and, to a lesser extent, ImageMagick.
 
-Most methods have optional parameters and assume sensible defaults. Methods with mandatory parameters often have names like `doSomethingWith(X)`.
+Most methods have optional parameters and assume sensible defaults.
-
+Please ensure backwards compatibility where possible.
-Please ensure backwards compatibility where possible. Methods to modify previously default behaviour often have names like `withoutOptionY()` or `withExtraZ()`.
 
 Feel free to create a [new issue](https://github.com/lovell/sharp/issues/new) to gather feedback on a potential API change.
 
@@ -60,7 +58,7 @@ Feel free to create a [new issue](https://github.com/lovell/sharp/issues/new) to
 
 A method to be removed should be deprecated in the next major version then removed in the following major version.
 
-By way of example, the [bilinearInterpolation method](https://github.com/lovell/sharp/blob/v0.6.0/index.js#L155) present in v0.5.0 was deprecated in v0.6.0 and removed in v0.7.0.
+By way of example, the `background()` method present in v0.20.0 was deprecated in v0.21.0 and removed in v0.22.0.
 
 ## Documentation
 
@@ -68,7 +66,7 @@ The public API is documented with [JSDoc](http://usejsdoc.org/) annotated commen
 
 These can be converted to Markdown by running:
 ```sh
-npm run docs
+npm run docs-build
 ```
 
 Please include documentation updates in any Pull Request that modifies the public API.
@@ -95,5 +93,5 @@ Please feel free to ask any questions via a
 [new issue](https://github.com/lovell/sharp/issues/new).
 
 If you're unable to post details publicly, please
-[e-mail](https://github.com/lovell/sharp/blob/master/package.json#L4)
+[e-mail](https://github.com/lovell/sharp/blob/main/package.json#L5)
 for private, paid consulting.

.github/FUNDING.yml

@@ -0,0 +1 @@
+open_collective: libvips

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Documentation
+    url: https://sharp.pixelplumbing.com/
+    about: Installation instructions, complete API documentation with examples, changelog

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,28 @@
+---
+name: Feature request
+about: Suggest an idea
+labels: enhancement
+
+---
+
+## Feature request
+
+### What are you trying to achieve?
+
+<!-- Please provide context here. -->
+
+### When you searched for similar feature requests, what did you find that might be related?
+
+<!-- Please demonstrate your research here. -->
+
+### What would you expect the API to look like?
+
+<!-- Please provide your suggestions here. -->
+
+### What alternatives have you considered?
+
+<!-- Please provide your ideas here. -->
+
+### Please provide sample image(s) that help explain this feature
+
+<!-- Please provide links to one or more images here. -->

.github/ISSUE_TEMPLATE/installation.md

@@ -0,0 +1,45 @@
+---
+name: Installation
+about: Something went wrong during either 'npm install sharp' or 'require("sharp")'
+labels: installation
+
+---
+
+<!-- Please try to answer as many of these questions as possible. -->
+
+## Possible install-time or require-time problem
+
+<!-- Please place an [x] in the box to confirm. -->
+
+- [ ] I have read the [documentation relating to installation](https://sharp.pixelplumbing.com/install).
+- [ ] I have ensured that the architecture and platform of Node.js used for `npm install` is the same as the architecture and platform of Node.js used at runtime.
+
+### Are you using the latest version of sharp?
+
+<!-- Please place an [x] in the box to confirm. -->
+
+- [ ] I am using the latest version of `sharp` as reported by `npm view sharp dist-tags.latest`.
+
+If you cannot confirm this, please upgrade to the latest version and try again before opening an issue.
+
+If you are using another package which depends on a version of `sharp` that is not the latest, please open an issue against that package instead.
+
+### Is this a problem with filesystem permissions?
+
+If you are using npm v6 or earlier and installing as a `root` or `sudo` user, have you tried with the `npm install --unsafe-perm` flag?
+
+If you are using npm v7 or later, does the user running `npm install` own the directory it is run in?
+
+If you are using the `ignore-scripts` feature of `npm`, have you tried with the `npm install --ignore-scripts=false` flag?
+
+### What is the complete output of running `npm install --verbose --foreground-scripts sharp` in an empty directory?
+
+<details>
+
+<!-- Please provide output of `npm install --verbose --foreground-scripts sharp` in an empty directory here. -->
+
+</details>
+
+### What is the output of running `npx envinfo --binaries --system --npmPackages=sharp --npmGlobalPackages=sharp`?
+
+<!-- Please provide output of `npx envinfo --binaries --system --npmPackages=sharp --npmGlobalPackages=sharp` here. -->

.github/ISSUE_TEMPLATE/possible-bug.md

@@ -0,0 +1,49 @@
+---
+name: Possible bug
+about: Installation of sharp was successful but then something unexpected occurred using one of its features
+labels: triage
+
+---
+
+<!-- If this issue relates to installation, please use https://github.com/lovell/sharp/issues/new?labels=installation&template=installation.md instead. -->
+
+## Possible bug
+
+### Is this a possible bug in a feature of sharp, unrelated to installation?
+
+<!-- Please place an [x] in the box to confirm. -->
+
+- [ ] Running `npm install sharp` completes without error.
+- [ ] Running `node -e "require('sharp')"` completes without error.
+
+If you cannot confirm both of these, please open an [installation issue](https://github.com/lovell/sharp/issues/new?labels=installation&template=installation.md) instead.
+
+### Are you using the latest version of sharp?
+
+<!-- Please place an [x] in the box to confirm. -->
+
+- [ ] I am using the latest version of `sharp` as reported by `npm view sharp dist-tags.latest`.
+
+If you cannot confirm this, please upgrade to the latest version and try again before opening an issue.
+
+If you are using another package which depends on a version of `sharp` that is not the latest, please open an issue against that package instead.
+
+### What is the output of running `npx envinfo --binaries --system --npmPackages=sharp --npmGlobalPackages=sharp`?
+
+<!-- Please provide output of the above command here. -->
+
+### What are the steps to reproduce?
+
+<!-- Please enter steps to reproduce here. -->
+
+### What is the expected behaviour?
+
+<!-- Please enter the expected behaviour here. -->
+
+### Please provide a minimal, standalone code sample, without other dependencies, that demonstrates this problem
+
+<!-- Please provide either formatted code or a link to a repo/gist that allows someone else to reproduce here. -->
+
+### Please provide sample image(s) that help explain this problem
+
+<!-- Please provide links to one or more images here. -->

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,26 @@
+---
+name: Question
+about: For help understanding an existing feature
+labels: question
+
+---
+
+<!-- If this issue relates to installation, please use https://github.com/lovell/sharp/issues/new?labels=installation&template=installation.md instead. -->
+
+## Question about an existing feature
+
+### What are you trying to achieve?
+
+<!-- Please provide context here. -->
+
+### When you searched for similar issues, what did you find that might be related?
+
+<!-- Please demonstrate your research here. -->
+
+### Please provide a minimal, standalone code sample, without other dependencies, that demonstrates this question
+
+<!-- Please provide either formatted code or a link to a repo/gist that helps someone else understand here. -->
+
+### Please provide sample image(s) that help explain this question
+
+<!-- Please provide links to one or more images here. -->

.github/workflows/ci-darwin-arm64v8.yml

@@ -0,0 +1,40 @@
+name: CI (MacStadium)
+on:
+  - push
+  - pull_request
+permissions: {}
+jobs:
+  CI:
+    permissions:
+      contents: write # for npx prebuild to make release
+    name: Node.js ${{ matrix.nodejs_version }} ${{ matrix.nodejs_arch }} ${{ matrix.prebuild && '- prebuild' }}
+    runs-on: macos-m1
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - nodejs_version: 14
+            nodejs_arch: x64
+          - nodejs_version: 18
+            nodejs_arch: arm64
+            prebuild: true
+    defaults:
+      run:
+        shell: /usr/bin/arch -arch arm64e /bin/bash -l {0}
+    steps:
+      - name: Dependencies (Node.js)
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.nodejs_version }}
+          architecture: ${{ matrix.nodejs_arch }}
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install
+        run: npm install --build-from-source --unsafe-perm
+      - name: Test
+        run: npm test
+      - name: Prebuild
+        if: matrix.prebuild && startsWith(github.ref, 'refs/tags/')
+        env:
+          prebuild_upload: ${{ secrets.GITHUB_TOKEN }}
+        run: npx prebuild --runtime napi --target 7

.github/workflows/ci.yml

@@ -0,0 +1,105 @@
+name: CI (GitHub)
+on:
+  - push
+  - pull_request
+permissions: {}
+jobs:
+  CI:
+    permissions:
+      contents: write # for npx prebuild to make release
+    name: ${{ matrix.container || matrix.os }} - Node.js ${{ matrix.nodejs_version }} ${{ matrix.nodejs_arch }} ${{ matrix.prebuild && '- prebuild' }}
+    runs-on: ${{ matrix.os }}
+    container: ${{ matrix.container }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-22.04
+            container: centos:7
+            nodejs_version: 14
+            prebuild: true
+          - os: ubuntu-22.04
+            container: centos:7
+            nodejs_version: 16
+          - os: ubuntu-22.04
+            container: rockylinux:8
+            nodejs_version: 18
+          - os: ubuntu-22.04
+            container: node:14-alpine3.12
+            prebuild: true
+          - os: ubuntu-22.04
+            container: node:16-alpine3.12
+          - os: ubuntu-22.04
+            container: node:18-alpine3.14
+          - os: macos-11
+            nodejs_version: 14
+            prebuild: true
+            nodejs_arch: x64
+          - os: macos-11
+            nodejs_version: 16
+            nodejs_arch: x64
+          - os: macos-11
+            nodejs_version: 18
+            nodejs_arch: x64
+          - os: windows-2019
+            nodejs_version: 14
+            nodejs_arch: x86
+            prebuild: true
+          - os: windows-2019
+            nodejs_version: 16
+            nodejs_arch: x86
+          - os: windows-2019
+            nodejs_version: 18
+            nodejs_arch: x86
+          - os: windows-2019
+            nodejs_version: 14
+            nodejs_arch: x64
+            prebuild: true
+          - os: windows-2019
+            nodejs_version: 16
+            nodejs_arch: x64
+          - os: windows-2019
+            nodejs_version: 18
+            nodejs_arch: x64
+    steps:
+      - name: Dependencies (Linux glibc)
+        if: contains(matrix.container, 'centos')
+        run: |
+          curl -sL https://rpm.nodesource.com/setup_${{ matrix.nodejs_version }}.x | bash -
+          yum install -y centos-release-scl
+          yum install -y devtoolset-11-gcc-c++ make git python3 nodejs fontconfig google-noto-sans-fonts
+          echo "/opt/rh/devtoolset-11/root/usr/bin" >> $GITHUB_PATH
+      - name: Dependencies (Rocky Linux glibc)
+        if: contains(matrix.container, 'rockylinux')
+        run: |
+          curl -sL https://rpm.nodesource.com/setup_${{ matrix.nodejs_version }}.x | bash -
+          dnf install -y gcc-toolset-11-gcc-c++ make git python3 nodejs fontconfig google-noto-sans-fonts
+          echo "/opt/rh/gcc-toolset-11/root/usr/bin" >> $GITHUB_PATH
+      - name: Dependencies (Linux musl)
+        if: contains(matrix.container, 'alpine')
+        run: apk add build-base git python3 font-noto --update-cache
+      - name: Dependencies (Python 3.10 - macOS, Windows)
+        if: contains(matrix.os, 'macos') || contains(matrix.os, 'windows')
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+      - name: Dependencies (Node.js - macOS, Windows)
+        if: contains(matrix.os, 'macos') || contains(matrix.os, 'windows')
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.nodejs_version }}
+          architecture: ${{ matrix.nodejs_arch }}
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Fix working directory ownership
+        if: matrix.container
+        run: chown root.root .
+      - name: Install
+        run: npm install --build-from-source --unsafe-perm
+      - name: Test
+        run: npm test
+      - name: Prebuild
+        if: matrix.prebuild && startsWith(github.ref, 'refs/tags/')
+        env:
+          prebuild_upload: ${{ secrets.GITHUB_TOKEN }}
+        run: npx prebuild --runtime napi --target 7

.gitignore

@@ -12,4 +12,7 @@ vendor
 .gitattributes
 .DS_Store
 .nyc_output
+.vscode/
 package-lock.json
+.idea
+.firebase

.mocharc.jsonc

@@ -0,0 +1,7 @@
+{
+  "parallel": true,
+  "slow": 1000,
+  "timeout": 30000,
+  "require": "./test/beforeEach.js",
+  "spec": "./test/unit/*.js"
+}

.npmignore

@@ -1,15 +0,0 @@
-build
-node_modules
-coverage
-.editorconfig
-.gitattributes
-.gitignore
-test
-.travis.yml
-appveyor.yml
-mkdocs.yml
-docs/css/
-vendor
-.prebuildrc
-.nyc_output
-CONTRIBUTING.md

.prebuildrc

@@ -1,4 +1,4 @@
 {
-  "include-regex": "(sharp\\.node|libvips-cpp\\.dll)",
+  "include-regex": "(sharp-.+\\.node|libvips-cpp\\.dll)",
   "strip": true
 }

.travis.yml

@@ -1,34 +0,0 @@
-language: node_js
-matrix:
-  include:
-    - os: linux
-      dist: trusty
-      sudo: false
-      node_js: "4"
-    - os: linux
-      dist: trusty
-      sudo: false
-      node_js: "6"
-    - os: linux
-      dist: trusty
-      sudo: false
-      node_js: "8"
-    - os: linux
-      dist: trusty
-      sudo: false
-      node_js: "10"
-    - os: osx
-      osx_image: xcode8.3
-      node_js: "4"
-    - os: osx
-      osx_image: xcode8.3
-      node_js: "6"
-    - os: osx
-      osx_image: xcode8.3
-      node_js: "8"
-    - os: osx
-      osx_image: xcode8.3
-      node_js: "10"
-after_success:
-  - npm install coveralls
-  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js

README.md

@@ -1,19 +1,14 @@
 # sharp
 
-```sh
+<img src="https://cdn.jsdelivr.net/gh/lovell/sharp@main/docs/image/sharp-logo.svg" width="160" height="160" alt="sharp logo" align="right">
-npm install sharp
-```
-
-```sh
-yarn add sharp
-```
 
 The typical use case for this high speed Node.js module
 is to convert large images in common formats to
-smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
+smaller, web-friendly JPEG, PNG, WebP, GIF and AVIF images of varying dimensions.
 
 Resizing an image is typically 4x-5x faster than using the
-quickest ImageMagick and GraphicsMagick settings.
+quickest ImageMagick and GraphicsMagick settings
+due to its use of [libvips](https://github.com/libvips/libvips).
 
 Colour spaces, embedded ICC profiles and alpha transparency channels are all handled correctly.
 Lanczos resampling ensures quality is not sacrificed for speed.
@@ -21,32 +16,64 @@ Lanczos resampling ensures quality is not sacrificed for speed.
 As well as image resizing, operations such as
 rotation, extraction, compositing and gamma correction are available.
 
-Most modern 64-bit OS X, Windows and Linux (glibc) systems running
+Most modern macOS, Windows and Linux systems running Node.js >= 14.15.0
-Node versions 4, 6, 8 and 10
 do not require any additional install or runtime dependencies.
 
+## Documentation
+
+Visit [sharp.pixelplumbing.com](https://sharp.pixelplumbing.com/) for complete
+[installation instructions](https://sharp.pixelplumbing.com/install),
+[API documentation](https://sharp.pixelplumbing.com/api-constructor),
+[benchmark tests](https://sharp.pixelplumbing.com/performance) and
+[changelog](https://sharp.pixelplumbing.com/changelog).
+
 ## Examples
 
+```sh
+npm install sharp
+```
+
 ```javascript
 const sharp = require('sharp');
 ```
 
+### Callback
+
 ```javascript
 sharp(inputBuffer)
   .resize(320, 240)
-  .toFile('output.webp', (err, info) => ... );
+  .toFile('output.webp', (err, info) => { ... });
-  // A Promises/A+ promise is returned when callback is not provided.
 ```
 
+### Promise
+
 ```javascript
 sharp('input.jpg')
   .rotate()
   .resize(200)
+  .jpeg({ mozjpeg: true })
   .toBuffer()
-  .then( data => ... )
+  .then( data => { ... })
-  .catch( err => ... );
+  .catch( err => { ... });
 ```
 
+### Async/await
+
+```javascript
+const semiTransparentRedPng = await sharp({
+  create: {
+    width: 48,
+    height: 48,
+    channels: 4,
+    background: { r: 255, g: 0, b: 0, alpha: 0.5 }
+  }
+})
+  .png()
+  .toBuffer();
+```
+
+### Stream
+
 ```javascript
 const roundedCorners = Buffer.from(
   '<svg><rect x="0" y="0" width="200" height="200" rx="50" ry="50"/></svg>'
@@ -55,7 +82,10 @@ const roundedCorners = Buffer.from(
 const roundedCornerResizer =
   sharp()
     .resize(200, 200)
-    .overlayWith(roundedCorners, { cutout: true })
+    .composite([{
+      input: roundedCorners,
+      blend: 'dest-in'
+    }])
     .png();
 
 readableStream
@@ -63,29 +93,21 @@ readableStream
   .pipe(writableStream);
 ```
 
-[![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.png?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)
+## Contributing
 
-### Documentation
+A [guide for contributors](https://github.com/lovell/sharp/blob/main/.github/CONTRIBUTING.md)
-
-Visit [sharp.pixelplumbing.com](http://sharp.pixelplumbing.com/) for complete
-[installation instructions](http://sharp.pixelplumbing.com/page/install),
-[API documentation](http://sharp.pixelplumbing.com/page/api),
-[benchmark tests](http://sharp.pixelplumbing.com/page/performance) and
-[changelog](http://sharp.pixelplumbing.com/page/changelog).
-
-### Contributing
-
-A [guide for contributors](https://github.com/lovell/sharp/blob/master/CONTRIBUTING.md)
 covers reporting bugs, requesting features and submitting code changes.
 
-### Licence
+[![Node-API v5](https://img.shields.io/badge/Node--API-v5-green.svg)](https://nodejs.org/dist/latest/docs/api/n-api.html#n_api_n_api_version_matrix)
 
-Copyright 2013, 2014, 2015, 2016, 2017, 2018 Lovell Fuller and contributors.
+## Licensing
+
+Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Lovell Fuller and contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
-[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0.html)
+[https://www.apache.org/licenses/LICENSE-2.0](https://www.apache.org/licenses/LICENSE-2.0)
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,

appveyor.yml

@@ -1,16 +0,0 @@
-os: Visual Studio 2015
-version: "{build}"
-build: off
-platform: x64
-environment:
-  matrix:
-  - nodejs_version: "4"
-  - nodejs_version: "6"
-  - nodejs_version: "8"
-  - nodejs_version: "10"
-install:
-  - ps: Install-Product node $env:nodejs_version x64
-  - npm install -g npm@5
-  - npm install
-test_script:
-  - npm test

binding.gyp

@@ -1,4 +1,9 @@
 {
+  'variables': {
+    'vips_version': '<!(node -p "require(\'./lib/libvips\').minimumLibvipsVersion")',
+    'platform_and_arch': '<!(node -p "require(\'./lib/platform\')()")',
+    'sharp_vendor_dir': './vendor/<(vips_version)/<(platform_and_arch)'
+  },
   'targets': [{
     'target_name': 'libvips-cpp',
     'conditions': [
@@ -10,25 +15,46 @@
           '_ALLOW_KEYWORD_MACROS'
         ],
         'sources': [
+          'src/libvips/cplusplus/VConnection.cpp',
           'src/libvips/cplusplus/VError.cpp',
+          'src/libvips/cplusplus/VImage.cpp',
           'src/libvips/cplusplus/VInterpolate.cpp',
-          'src/libvips/cplusplus/VImage.cpp'
+          'src/libvips/cplusplus/VRegion.cpp'
         ],
         'include_dirs': [
-          'vendor/include',
+          '<(sharp_vendor_dir)/include',
-          'vendor/include/glib-2.0',
+          '<(sharp_vendor_dir)/include/glib-2.0',
-          'vendor/lib/glib-2.0/include'
+          '<(sharp_vendor_dir)/lib/glib-2.0/include'
-        ],
-        'libraries': [
-          '../vendor/lib/libvips.lib',
-          '../vendor/lib/libglib-2.0.lib',
-          '../vendor/lib/libgobject-2.0.lib'
         ],
+        'link_settings': {
+          'library_dirs': ['<(sharp_vendor_dir)/lib'],
+          'libraries': [
+            'libvips.lib',
+            'libglib-2.0.lib',
+            'libgobject-2.0.lib'
+          ],
+        },
         'configurations': {
           'Release': {
             'msvs_settings': {
               'VCCLCompilerTool': {
-                'ExceptionHandling': 1
+                'ExceptionHandling': 1,
+                'Optimization': 1,
+                'WholeProgramOptimization': 'true'
+              },
+              'VCLibrarianTool': {
+                'AdditionalOptions': [
+                  '/LTCG:INCREMENTAL'
+                ]
+              },
+              'VCLinkerTool': {
+                'ImageHasSafeExceptionHandlers': 'false',
+                'OptimizeReferences': 2,
+                'EnableCOMDATFolding': 2,
+                'LinkIncremental': 1,
+                'AdditionalOptions': [
+                  '/LTCG:INCREMENTAL'
+                ]
               }
             },
             'msvs_disabled_warnings': [
@@ -42,16 +68,20 @@
       }]
     ]
   }, {
-    'target_name': 'sharp',
+    'target_name': 'sharp-<(platform_and_arch)',
+    'defines': [
+      'NAPI_VERSION=7'
+    ],
     'dependencies': [
+      '<!(node -p "require(\'node-addon-api\').gyp")',
       'libvips-cpp'
     ],
     'variables': {
       'runtime_link%': 'shared',
       'conditions': [
         ['OS != "win"', {
-          'pkg_config_path': '<!(node -e "console.log(require(\'./lib/libvips\').pkgConfigPath())")',
+          'pkg_config_path': '<!(node -p "require(\'./lib/libvips\').pkgConfigPath()")',
-          'use_global_libvips': '<!(node -e "console.log(Boolean(require(\'./lib/libvips\').useGlobalLibvips()).toString())")'
+          'use_global_libvips': '<!(node -p "Boolean(require(\'./lib/libvips\').useGlobalLibvips()).toString()")'
         }, {
           'pkg_config_path': '',
           'use_global_libvips': ''
@@ -64,11 +94,11 @@
       'src/stats.cc',
       'src/operations.cc',
       'src/pipeline.cc',
-      'src/sharp.cc',
+      'src/utilities.cc',
-      'src/utilities.cc'
+      'src/sharp.cc'
     ],
     'include_dirs': [
-      '<!(node -e "require(\'nan\')")'
+      '<!(node -p "require(\'node-addon-api\').include_dir")',
     ],
     'conditions': [
       ['use_global_libvips == "true"', {
@@ -90,70 +120,53 @@
       }, {
         # Use pre-built libvips stored locally within node_modules
         'include_dirs': [
-          'vendor/include',
+          '<(sharp_vendor_dir)/include',
-          'vendor/include/glib-2.0',
+          '<(sharp_vendor_dir)/include/glib-2.0',
-          'vendor/lib/glib-2.0/include'
+          '<(sharp_vendor_dir)/lib/glib-2.0/include'
         ],
         'conditions': [
           ['OS == "win"', {
             'defines': [
-              '_ALLOW_KEYWORD_MACROS'
+              '_ALLOW_KEYWORD_MACROS',
+              '_FILE_OFFSET_BITS=64'
             ],
-            'libraries': [
+            'link_settings': {
-              '../vendor/lib/libvips.lib',
+              'library_dirs': ['<(sharp_vendor_dir)/lib'],
-              '../vendor/lib/libglib-2.0.lib',
+              'libraries': [
-              '../vendor/lib/libgobject-2.0.lib'
+                'libvips.lib',
-            ]
+                'libglib-2.0.lib',
+                'libgobject-2.0.lib'
+              ]
+            }
           }],
           ['OS == "mac"', {
-            'libraries': [
+            'link_settings': {
-              '../vendor/lib/libvips-cpp.42.dylib',
+              'library_dirs': ['../<(sharp_vendor_dir)/lib'],
-              '../vendor/lib/libvips.42.dylib',
+              'libraries': [
-              '../vendor/lib/libglib-2.0.0.dylib',
+                'libvips-cpp.42.dylib'
-              '../vendor/lib/libgobject-2.0.0.dylib',
+              ]
-              # Ensure runtime linking is relative to sharp.node
+            },
-              '-rpath \'@loader_path/../../vendor/lib\''
+            'xcode_settings': {
-            ]
+              'OTHER_LDFLAGS': [
+                # Ensure runtime linking is relative to sharp.node
+                '-Wl,-rpath,\'@loader_path/../../<(sharp_vendor_dir)/lib\''
+              ]
+            }
           }],
           ['OS == "linux"', {
             'defines': [
-              '_GLIBCXX_USE_CXX11_ABI=0'
+              '_GLIBCXX_USE_CXX11_ABI=1'
             ],
-            'libraries': [
+            'link_settings': {
-              '../vendor/lib/libvips-cpp.so',
+              'library_dirs': ['../<(sharp_vendor_dir)/lib'],
-              '../vendor/lib/libvips.so',
+              'libraries': [
-              '../vendor/lib/libglib-2.0.so',
+                '-l:libvips-cpp.so.42'
-              '../vendor/lib/libgobject-2.0.so',
+              ],
-              # Dependencies of dependencies, included for openSUSE support
+              'ldflags': [
-              '../vendor/lib/libcairo.so',
+                # Ensure runtime linking is relative to sharp.node
-              '../vendor/lib/libcroco-0.6.so',
+                '-Wl,-s -Wl,--disable-new-dtags -Wl,-rpath=\'$$ORIGIN/../../<(sharp_vendor_dir)/lib\''
-              '../vendor/lib/libexif.so',
+              ]
-              '../vendor/lib/libffi.so',
+            }
-              '../vendor/lib/libfontconfig.so',
-              '../vendor/lib/libfreetype.so',
-              '../vendor/lib/libgdk_pixbuf-2.0.so',
-              '../vendor/lib/libgif.so',
-              '../vendor/lib/libgio-2.0.so',
-              '../vendor/lib/libgmodule-2.0.so',
-              '../vendor/lib/libgsf-1.so',
-              '../vendor/lib/libgthread-2.0.so',
-              '../vendor/lib/libharfbuzz.so',
-              '../vendor/lib/libjpeg.so',
-              '../vendor/lib/liblcms2.so',
-              '../vendor/lib/liborc-0.4.so',
-              '../vendor/lib/libpango-1.0.so',
-              '../vendor/lib/libpangocairo-1.0.so',
-              '../vendor/lib/libpangoft2-1.0.so',
-              '../vendor/lib/libpixman-1.so',
-              '../vendor/lib/libpng.so',
-              '../vendor/lib/librsvg-2.so',
-              '../vendor/lib/libtiff.so',
-              '../vendor/lib/libwebp.so',
-              '../vendor/lib/libxml2.so',
-              '../vendor/lib/libz.so',
-              # Ensure runtime linking is relative to sharp.node
-              '-Wl,--disable-new-dtags -Wl,-rpath=\'$${ORIGIN}/../../vendor/lib\''
-            ]
           }]
         ]
       }]
@@ -162,29 +175,58 @@
       '-std=c++0x',
       '-fexceptions',
       '-Wall',
-      '-O3'
+      '-Os'
     ],
     'xcode_settings': {
       'CLANG_CXX_LANGUAGE_STANDARD': 'c++11',
-      'CLANG_CXX_LIBRARY': 'libc++',
+      'MACOSX_DEPLOYMENT_TARGET': '10.9',
-      'MACOSX_DEPLOYMENT_TARGET': '10.7',
       'GCC_ENABLE_CPP_EXCEPTIONS': 'YES',
       'GCC_ENABLE_CPP_RTTI': 'YES',
       'OTHER_CPLUSPLUSFLAGS': [
         '-fexceptions',
         '-Wall',
-        '-O3'
+        '-Oz'
       ]
     },
     'configurations': {
       'Release': {
-        'msvs_settings': {
+        'conditions': [
-          'VCCLCompilerTool': {
+          ['OS == "linux"', {
-            'ExceptionHandling': 1
+            'cflags_cc': [
-          }
+              '-Wno-cast-function-type'
-        },
+            ]
-        'msvs_disabled_warnings': [
+          }],
-          4275
+          ['target_arch == "arm"', {
+            'cflags_cc': [
+              '-Wno-psabi'
+            ]
+          }],
+          ['OS == "win"', {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'ExceptionHandling': 1,
+                'Optimization': 1,
+                'WholeProgramOptimization': 'true'
+              },
+              'VCLibrarianTool': {
+                'AdditionalOptions': [
+                  '/LTCG:INCREMENTAL'
+                ]
+              },
+              'VCLinkerTool': {
+                'ImageHasSafeExceptionHandlers': 'false',
+                'OptimizeReferences': 2,
+                'EnableCOMDATFolding': 2,
+                'LinkIncremental': 1,
+                'AdditionalOptions': [
+                  '/LTCG:INCREMENTAL'
+                ]
+              }
+            },
+            'msvs_disabled_warnings': [
+              4275
+            ]
+          }]
         ]
       }
     },

docs/README.md

@@ -0,0 +1,88 @@
+# sharp
+
+<img src="https://cdn.jsdelivr.net/gh/lovell/sharp@main/docs/image/sharp-logo.svg" width="160" height="160" alt="sharp logo" align="right">
+
+The typical use case for this high speed Node.js module
+is to convert large images in common formats to
+smaller, web-friendly JPEG, PNG, WebP, GIF and AVIF images of varying dimensions.
+
+Resizing an image is typically 4x-5x faster than using the
+quickest ImageMagick and GraphicsMagick settings
+due to its use of [libvips](https://github.com/libvips/libvips).
+
+Colour spaces, embedded ICC profiles and alpha transparency channels are all handled correctly.
+Lanczos resampling ensures quality is not sacrificed for speed.
+
+As well as image resizing, operations such as
+rotation, extraction, compositing and gamma correction are available.
+
+Most modern macOS, Windows and Linux systems running Node.js >= 14.15.0
+do not require any additional install or runtime dependencies.
+
+### Formats
+
+This module supports reading JPEG, PNG, WebP, GIF, AVIF, TIFF and SVG images.
+
+Output images can be in JPEG, PNG, WebP, GIF, AVIF and TIFF formats as well as uncompressed raw pixel data.
+
+Streams, Buffer objects and the filesystem can be used for input and output.
+
+A single input Stream can be split into multiple processing pipelines and output Streams.
+
+Deep Zoom image pyramids can be generated,
+suitable for use with "slippy map" tile viewers like
+[OpenSeadragon](https://github.com/openseadragon/openseadragon).
+
+### Fast
+
+This module is powered by the blazingly fast
+[libvips](https://github.com/libvips/libvips) image processing library,
+originally created in 1989 at Birkbeck College
+and currently maintained by a small team led by
+[John Cupitt](https://github.com/jcupitt).
+
+Only small regions of uncompressed image data
+are held in memory and processed at a time,
+taking full advantage of multiple CPU cores and L1/L2/L3 cache.
+
+Everything remains non-blocking thanks to _libuv_,
+no child processes are spawned and Promises/async/await are supported.
+
+### Optimal
+
+The features of `mozjpeg` and `pngquant` can be used
+to optimise the file size of JPEG and PNG images respectively,
+without having to invoke separate `imagemin` processes.
+
+Huffman tables are optimised when generating JPEG output images
+without having to use separate command line tools like
+[jpegoptim](https://github.com/tjko/jpegoptim) and
+[jpegtran](http://jpegclub.org/jpegtran/).
+
+PNG filtering is disabled by default,
+which for diagrams and line art often produces the same result
+as [pngcrush](https://pmt.sourceforge.io/pngcrush/).
+
+The file size of animated GIF output is optimised
+without having to use separate command line tools such as
+[gifsicle](https://www.lcdf.org/gifsicle/).
+
+### Contributing
+
+A [guide for contributors](https://github.com/lovell/sharp/blob/main/.github/CONTRIBUTING.md)
+covers reporting bugs, requesting features and submitting code changes.
+
+### Licensing
+
+Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Lovell Fuller and contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+[https://www.apache.org/licenses/LICENSE-2.0](https://www.apache.org/licenses/LICENSE-2.0)
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

docs/api-channel.md

@@ -4,6 +4,8 @@
 
 Remove alpha channel, if any. This is a no-op if the image does not have an alpha channel.
 
+See also [flatten][1].
+
 ### Examples
 
 ```javascript
@@ -14,7 +16,42 @@ sharp('rgba.png')
   });
 ```
 
-Returns **Sharp** 
+Returns **Sharp** 
+
+## ensureAlpha
+
+Ensure the output image has an alpha transparency channel.
+If missing, the added alpha channel will have the specified
+transparency level, defaulting to fully-opaque (1).
+This is a no-op if the image already has an alpha channel.
+
+### Parameters
+
+*   `alpha` **[number][2]** alpha transparency level (0=fully-transparent, 1=fully-opaque) (optional, default `1`)
+
+### Examples
+
+```javascript
+// rgba.png will be a 4 channel image with a fully-opaque alpha channel
+await sharp('rgb.jpg')
+  .ensureAlpha()
+  .toFile('rgba.png')
+```
+
+```javascript
+// rgba is a 4 channel image with a fully-transparent alpha channel
+const rgba = await sharp(rgb)
+  .ensureAlpha(0)
+  .toBuffer();
+```
+
+*   Throws **[Error][3]** Invalid alpha transparency level
+
+Returns **Sharp** 
+
+**Meta**
+
+*   **since**: 0.21.2
 
 ## extractChannel
 
@@ -22,22 +59,28 @@ Extract a single channel from a multi-channel image.
 
 ### Parameters
 
--   `channel` **([Number][1] \| [String][2])** zero-indexed band number to extract, or `red`, `green` or `blue` as alternative to `0`, `1` or `2` respectively.
+*   `channel` **([number][2] | [string][4])** zero-indexed channel/band number to extract, or `red`, `green`, `blue` or `alpha`.
 
 ### Examples
 
 ```javascript
-sharp(input)
+// green.jpg is a greyscale image containing the green channel of the input
+await sharp(input)
   .extractChannel('green')
-  .toFile('input_green.jpg', function(err, info) {
+  .toFile('green.jpg');
-    // info.channels === 1
-    // input_green.jpg contains the green channel of the input image
-   });
 ```
 
--   Throws **[Error][3]** Invalid channel
+```javascript
+// red1 is the red value of the first pixel, red2 the second pixel etc.
+const [red1, red2, ...] = await sharp(input)
+  .extractChannel(0)
+  .raw()
+  .toBuffer();
+```
 
-Returns **Sharp** 
+*   Throws **[Error][3]** Invalid channel
+
+Returns **Sharp** 
 
 ## joinChannel
 
@@ -46,21 +89,22 @@ The meaning of the added channels depends on the output colourspace, set with `t
 By default the output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
 Channel ordering follows vips convention:
 
--   sRGB: 0: Red, 1: Green, 2: Blue, 3: Alpha.
+*   sRGB: 0: Red, 1: Green, 2: Blue, 3: Alpha.
--   CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha.
+*   CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha.
 
-Buffers may be any of the image formats supported by sharp: JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data.
+Buffers may be any of the image formats supported by sharp.
 For raw pixel input, the `options` object should contain a `raw` attribute, which follows the format of the attribute of the same name in the `sharp()` constructor.
 
 ### Parameters
 
--   `images` **([Array][4]<([String][2] \| [Buffer][5])> | [String][2] \| [Buffer][5])** one or more images (file paths, Buffers).
+*   `images` **([Array][5]<([string][4] | [Buffer][6])> | [string][4] | [Buffer][6])** one or more images (file paths, Buffers).
--   `options` **[Object][6]** image options, see `sharp()` constructor.
+*   `options` **[Object][7]** image options, see `sharp()` constructor.
 
+<!---->
 
--   Throws **[Error][3]** Invalid parameters
+*   Throws **[Error][3]** Invalid parameters
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
 
 ## bandbool
 
@@ -68,7 +112,7 @@ Perform a bitwise boolean operation on all input image channels (bands) to produ
 
 ### Parameters
 
--   `boolOp` **[String][2]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+*   `boolOp` **[string][4]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
 
 ### Examples
 
@@ -82,18 +126,20 @@ sharp('3-channel-rgb-input.png')
   });
 ```
 
--   Throws **[Error][3]** Invalid parameters
+*   Throws **[Error][3]** Invalid parameters
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
 
-[1]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+[1]: /api-operation#flatten
 
-[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
 
 [3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
 
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
+[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
 
-[5]: https://nodejs.org/api/buffer.html
+[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
 
-[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+[6]: https://nodejs.org/api/buffer.html
+
+[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object

docs/api-colour.md

@@ -1,23 +1,5 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->
 
-## background
-
-Set the background for the `embed`, `flatten` and `extend` operations.
-The default background is `{r: 0, g: 0, b: 0, alpha: 1}`, black without transparency.
-
-Delegates to the _color_ module, which can throw an Error
-but is liberal in what it accepts, clipping values to sensible min/max.
-The alpha value is a float between `0` (transparent) and `1` (opaque).
-
-### Parameters
-
--   `rgba` **([String][1] \| [Object][2])** parsed by the [color][3] module to extract values for red, green, blue and alpha.
-
-
--   Throws **[Error][4]** Invalid parameter
-
-Returns **Sharp** 
-
 ## tint
 
 Tint the image using the provided chroma while preserving the image luminance.
@@ -25,12 +7,19 @@ An alpha channel may be present and will be unchanged by the operation.
 
 ### Parameters
 
--   `rgb` **([String][1] \| [Object][2])** parsed by the [color][3] module to extract chroma values.
+*   `rgb` **([string][1] | [Object][2])** parsed by the [color][3] module to extract chroma values.
 
+### Examples
 
--   Throws **[Error][4]** Invalid parameter
+```javascript
+const output = await sharp(input)
+  .tint({ r: 255, g: 240, b: 16 })
+  .toBuffer();
+```
 
-Returns **Sharp** 
+*   Throws **[Error][4]** Invalid parameter
+
+Returns **Sharp**&#x20;
 
 ## greyscale
 
@@ -43,9 +32,15 @@ An alpha channel may be present, and will be unchanged by the operation.
 
 ### Parameters
 
--   `greyscale` **[Boolean][5]**  (optional, default `true`)
+*   `greyscale` **[Boolean][5]**  (optional, default `true`)
 
-Returns **Sharp** 
+### Examples
+
+```javascript
+const output = await sharp(input).greyscale().toBuffer();
+```
+
+Returns **Sharp**&#x20;
 
 ## grayscale
 
@@ -53,9 +48,54 @@ Alternative spelling of `greyscale`.
 
 ### Parameters
 
--   `grayscale` **[Boolean][5]**  (optional, default `true`)
+*   `grayscale` **[Boolean][5]**  (optional, default `true`)
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
+
+## pipelineColourspace
+
+Set the pipeline colourspace.
+
+The input image will be converted to the provided colourspace at the start of the pipeline.
+All operations will use this colourspace before converting to the output colourspace, as defined by [toColourspace][6].
+
+This feature is experimental and has not yet been fully-tested with all operations.
+
+### Parameters
+
+*   `colourspace` **[string][1]?** pipeline colourspace e.g. `rgb16`, `scrgb`, `lab`, `grey16` [...][7]
+
+### Examples
+
+```javascript
+// Run pipeline in 16 bits per channel RGB while converting final result to 8 bits per channel sRGB.
+await sharp(input)
+ .pipelineColourspace('rgb16')
+ .toColourspace('srgb')
+ .toFile('16bpc-pipeline-to-8bpc-output.png')
+```
+
+*   Throws **[Error][4]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.29.0
+
+## pipelineColorspace
+
+Alternative spelling of `pipelineColourspace`.
+
+### Parameters
+
+*   `colorspace` **[string][1]?** pipeline colorspace.
+
+<!---->
+
+*   Throws **[Error][4]** Invalid parameters
+
+Returns **Sharp**&#x20;
 
 ## toColourspace
 
@@ -64,12 +104,20 @@ By default output image will be web-friendly sRGB, with additional channels inte
 
 ### Parameters
 
--   `colourspace` **[String][1]?** output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][6]
+*   `colourspace` **[string][1]?** output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][8]
 
+### Examples
 
--   Throws **[Error][4]** Invalid parameters
+```javascript
+// Output 16 bits per pixel RGB
+await sharp(input)
+ .toColourspace('rgb16')
+ .toFile('16-bpp.png')
+```
 
-Returns **Sharp** 
+*   Throws **[Error][4]** Invalid parameters
+
+Returns **Sharp**&#x20;
 
 ## toColorspace
 
@@ -77,12 +125,13 @@ Alternative spelling of `toColourspace`.
 
 ### Parameters
 
--   `colorspace` **[String][1]?** output colorspace.
+*   `colorspace` **[string][1]?** output colorspace.
 
+<!---->
 
--   Throws **[Error][4]** Invalid parameters
+*   Throws **[Error][4]** Invalid parameters
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
 
 [1]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
 
@@ -94,4 +143,8 @@ Returns **Sharp**
 
 [5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
 
-[6]: https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568
+[6]: #tocolourspace
+
+[7]: https://github.com/libvips/libvips/blob/41cff4e9d0838498487a00623462204eb10ee5b8/libvips/iofuncs/enumtypes.c#L774
+
+[8]: https://github.com/libvips/libvips/blob/3c0bfdf74ce1dc37a6429bed47fa76f16e2cd70a/libvips/iofuncs/enumtypes.c#L777-L794

docs/api-composite.md

@@ -1,43 +1,90 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->
 
-## overlayWith
+## composite
 
-Overlay (composite) an image over the processed (resized, extracted etc.) image.
+Composite image(s) over the processed (resized, extracted etc.) image.
 
-The overlay image must be the same size or smaller than the processed image.
+The images to composite must be the same size or smaller than the processed image.
 If both `top` and `left` options are provided, they take precedence over `gravity`.
 
-If the overlay image contains an alpha channel then composition with premultiplication will occur.
+Any resize or rotate operations in the same processing pipeline
+will always be applied to the input image before composition.
+
+The `blend` option can be one of `clear`, `source`, `over`, `in`, `out`, `atop`,
+`dest`, `dest-over`, `dest-in`, `dest-out`, `dest-atop`,
+`xor`, `add`, `saturate`, `multiply`, `screen`, `overlay`, `darken`, `lighten`,
+`colour-dodge`, `color-dodge`, `colour-burn`,`color-burn`,
+`hard-light`, `soft-light`, `difference`, `exclusion`.
+
+More information about blend modes can be found at
+[https://www.libvips.org/API/current/libvips-conversion.html#VipsBlendMode][1]
+and [https://www.cairographics.org/operators/][2]
 
 ### Parameters
 
--   `overlay` **([Buffer][1] \| [String][2])** Buffer containing image data or String containing the path to an image file.
+*   `images` **[Array][3]<[Object][4]>** Ordered list of images to composite
--   `options` **[Object][3]?** 
+
-    -   `options.gravity` **[String][2]** gravity at which to place the overlay. (optional, default `'centre'`)
+    *   `images[].input` **([Buffer][5] | [String][6])?** Buffer containing image data, String containing the path to an image file, or Create object (see below)
-    -   `options.top` **[Number][4]?** the pixel offset from the top edge.
+
-    -   `options.left` **[Number][4]?** the pixel offset from the left edge.
+        *   `images[].input.create` **[Object][4]?** describes a blank overlay to be created.
-    -   `options.tile` **[Boolean][5]** set to true to repeat the overlay image across the entire image with the given `gravity`. (optional, default `false`)
+
-    -   `options.cutout` **[Boolean][5]** set to true to apply only the alpha channel of the overlay image to the input image, giving the appearance of one image being cut out of another. (optional, default `false`)
+            *   `images[].input.create.width` **[Number][7]?**&#x20;
-    -   `options.density` **[Number][4]** integral number representing the DPI for vector overlay image. (optional, default `72`)
+            *   `images[].input.create.height` **[Number][7]?**&#x20;
-    -   `options.raw` **[Object][3]?** describes overlay when using raw pixel data.
+            *   `images[].input.create.channels` **[Number][7]?** 3-4
-        -   `options.raw.width` **[Number][4]?** 
+            *   `images[].input.create.background` **([String][6] | [Object][4])?** parsed by the [color][8] module to extract values for red, green, blue and alpha.
-        -   `options.raw.height` **[Number][4]?** 
+        *   `images[].input.text` **[Object][4]?** describes a new text image to be created.
-        -   `options.raw.channels` **[Number][4]?** 
+
-    -   `options.create` **[Object][3]?** describes a blank overlay to be created.
+            *   `images[].input.text.text` **[string][6]?** text to render as a UTF-8 string. It can contain Pango markup, for example `<i>Le</i>Monde`.
-        -   `options.create.width` **[Number][4]?** 
+            *   `images[].input.text.font` **[string][6]?** font name to render with.
-        -   `options.create.height` **[Number][4]?** 
+            *   `images[].input.text.fontfile` **[string][6]?** absolute filesystem path to a font file that can be used by `font`.
-        -   `options.create.channels` **[Number][4]?** 3-4
+            *   `images[].input.text.width` **[number][7]** integral number of pixels to word-wrap at. Lines of text wider than this will be broken at word boundaries. (optional, default `0`)
-        -   `options.create.background` **([String][2] \| [Object][3])?** parsed by the [color][6] module to extract values for red, green, blue and alpha.
+            *   `images[].input.text.height` **[number][7]** integral number of pixels high. When defined, `dpi` will be ignored and the text will automatically fit the pixel resolution defined by `width` and `height`. Will be ignored if `width` is not specified or set to 0. (optional, default `0`)
+            *   `images[].input.text.align` **[string][6]** text alignment (`'left'`, `'centre'`, `'center'`, `'right'`). (optional, default `'left'`)
+            *   `images[].input.text.justify` **[boolean][9]** set this to true to apply justification to the text. (optional, default `false`)
+            *   `images[].input.text.dpi` **[number][7]** the resolution (size) at which to render the text. Does not take effect if `height` is specified. (optional, default `72`)
+            *   `images[].input.text.rgba` **[boolean][9]** set this to true to enable RGBA output. This is useful for colour emoji rendering, or support for pango markup features like `<span foreground="red">Red!</span>`. (optional, default `false`)
+            *   `images[].input.text.spacing` **[number][7]** text line height in points. Will use the font line height if none is specified. (optional, default `0`)
+    *   `images[].blend` **[String][6]** how to blend this image with the image below. (optional, default `'over'`)
+    *   `images[].gravity` **[String][6]** gravity at which to place the overlay. (optional, default `'centre'`)
+    *   `images[].top` **[Number][7]?** the pixel offset from the top edge.
+    *   `images[].left` **[Number][7]?** the pixel offset from the left edge.
+    *   `images[].tile` **[Boolean][9]** set to true to repeat the overlay image across the entire image with the given `gravity`. (optional, default `false`)
+    *   `images[].premultiplied` **[Boolean][9]** set to true to avoid premultipling the image below. Equivalent to the `--premultiplied` vips option. (optional, default `false`)
+    *   `images[].density` **[Number][7]** number representing the DPI for vector overlay image. (optional, default `72`)
+    *   `images[].raw` **[Object][4]?** describes overlay when using raw pixel data.
+
+        *   `images[].raw.width` **[Number][7]?**&#x20;
+        *   `images[].raw.height` **[Number][7]?**&#x20;
+        *   `images[].raw.channels` **[Number][7]?**&#x20;
+    *   `images[].animated` **[boolean][9]** Set to `true` to read all frames/pages of an animated image. (optional, default `false`)
+    *   `images[].failOn` **[string][6]** @see [constructor parameters][10] (optional, default `'warning'`)
+    *   `images[].limitInputPixels` **([number][7] | [boolean][9])** @see [constructor parameters][10] (optional, default `268402689`)
 
 ### Examples
 
+```javascript
+await sharp(background)
+  .composite([
+    { input: layer1, gravity: 'northwest' },
+    { input: layer2, gravity: 'southeast' },
+  ])
+  .toFile('combined.png');
+```
+
+```javascript
+const output = await sharp('input.gif', { animated: true })
+  .composite([
+    { input: 'overlay.png', tile: true, blend: 'saturate' }
+  ])
+  .toBuffer();
+```
+
 ```javascript
 sharp('input.png')
   .rotate(180)
   .resize(300)
-  .flatten()
+  .flatten( { background: '#ff6600' } )
-  .background('#ff6600')
+  .composite([{ input: 'overlay.png', gravity: 'southeast' }])
-  .overlayWith('overlay.png', { gravity: sharp.gravity.southeast } )
   .sharpen()
   .withMetadata()
   .webp( { quality: 90 } )
@@ -49,20 +96,32 @@ sharp('input.png')
   });
 ```
 
--   Throws **[Error][7]** Invalid parameters
+*   Throws **[Error][11]** Invalid parameters
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
 
-[1]: https://nodejs.org/api/buffer.html
+**Meta**
 
-[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+*   **since**: 0.22.0
 
-[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+[1]: https://www.libvips.org/API/current/libvips-conversion.html#VipsBlendMode
 
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+[2]: https://www.cairographics.org/operators/
 
-[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
 
-[6]: https://www.npmjs.org/package/color
+[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
 
-[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+[5]: https://nodejs.org/api/buffer.html
+
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[8]: https://www.npmjs.org/package/color
+
+[9]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[10]: /api-constructor#parameters
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error

docs/api-constructor.md

@@ -2,27 +2,67 @@
 
 ## Sharp
 
+Constructor factory to create an instance of `sharp`, to which further methods are chained.
+
+JPEG, PNG, WebP, GIF, AVIF or TIFF format image data can be streamed out from this object.
+When using Stream based output, derived attributes are available from the `info` event.
+
+Non-critical problems encountered during processing are emitted as `warning` events.
+
+Implements the [stream.Duplex][1] class.
+
 ### Parameters
 
--   `input` **([Buffer][1] \| [String][2])?** if present, can be
+*   `input` **([Buffer][2] | [Uint8Array][3] | [Uint8ClampedArray][4] | [Int8Array][5] | [Uint16Array][6] | [Int16Array][7] | [Uint32Array][8] | [Int32Array][9] | [Float32Array][10] | [Float64Array][11] | [string][12])?** if present, can be
-     a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
+    a Buffer / Uint8Array / Uint8ClampedArray containing JPEG, PNG, WebP, AVIF, GIF, SVG or TIFF image data, or
-     a String containing the path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file.
+    a TypedArray containing raw pixel image data, or
-     JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
+    a String containing the filesystem path to an JPEG, PNG, WebP, AVIF, GIF, SVG or TIFF image file.
--   `options` **[Object][3]?** if present, is an Object with optional attributes.
+    JPEG, PNG, WebP, AVIF, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
-    -   `options.failOnError` **[Boolean][4]** by default apply a "best effort"
+*   `options` **[Object][13]?** if present, is an Object with optional attributes.
-         to decode images, even if the data is corrupt or invalid. Set this flag to true
+
-         if you'd rather halt processing and raise an error when loading invalid images. (optional, default `false`)
+    *   `options.failOn` **[string][12]** when to abort processing of invalid pixel data, one of (in order of sensitivity): 'none' (least), 'truncated', 'error' or 'warning' (most), highers level imply lower levels, invalid metadata will always abort. (optional, default `'warning'`)
-    -   `options.density` **[Number][5]** integral number representing the DPI for vector images. (optional, default `72`)
+    *   `options.limitInputPixels` **([number][14] | [boolean][15])** Do not process input images where the number of pixels
-    -   `options.page` **[Number][5]** page number to extract for multi-page input (GIF, TIFF) (optional, default `0`)
+        (width x height) exceeds this limit. Assumes image dimensions contained in the input metadata can be trusted.
-    -   `options.raw` **[Object][3]?** describes raw pixel input image data. See `raw()` for pixel ordering.
+        An integral Number of pixels, zero or false to remove limit, true to use default limit of 268402689 (0x3FFF x 0x3FFF). (optional, default `268402689`)
-        -   `options.raw.width` **[Number][5]?** 
+    *   `options.unlimited` **[boolean][15]** Set this to `true` to remove safety features that help prevent memory exhaustion (JPEG, PNG, SVG, HEIF). (optional, default `false`)
-        -   `options.raw.height` **[Number][5]?** 
+    *   `options.sequentialRead` **[boolean][15]** Set this to `true` to use sequential rather than random access where possible.
-        -   `options.raw.channels` **[Number][5]?** 1-4
+        This can reduce memory usage and might improve performance on some systems. (optional, default `false`)
-    -   `options.create` **[Object][3]?** describes a new image to be created.
+    *   `options.density` **[number][14]** number representing the DPI for vector images in the range 1 to 100000. (optional, default `72`)
-        -   `options.create.width` **[Number][5]?** 
+    *   `options.pages` **[number][14]** number of pages to extract for multi-page input (GIF, WebP, AVIF, TIFF, PDF), use -1 for all pages. (optional, default `1`)
-        -   `options.create.height` **[Number][5]?** 
+    *   `options.page` **[number][14]** page number to start extracting from for multi-page input (GIF, WebP, AVIF, TIFF, PDF), zero based. (optional, default `0`)
-        -   `options.create.channels` **[Number][5]?** 3-4
+    *   `options.subifd` **[number][14]** subIFD (Sub Image File Directory) to extract for OME-TIFF, defaults to main image. (optional, default `-1`)
-        -   `options.create.background` **([String][2] \| [Object][3])?** parsed by the [color][6] module to extract values for red, green, blue and alpha.
+    *   `options.level` **[number][14]** level to extract from a multi-level input (OpenSlide), zero based. (optional, default `0`)
+    *   `options.animated` **[boolean][15]** Set to `true` to read all frames/pages of an animated image (equivalent of setting `pages` to `-1`). (optional, default `false`)
+    *   `options.raw` **[Object][13]?** describes raw pixel input image data. See `raw()` for pixel ordering.
+
+        *   `options.raw.width` **[number][14]?** integral number of pixels wide.
+        *   `options.raw.height` **[number][14]?** integral number of pixels high.
+        *   `options.raw.channels` **[number][14]?** integral number of channels, between 1 and 4.
+        *   `options.raw.premultiplied` **[boolean][15]?** specifies that the raw input has already been premultiplied, set to `true`
+            to avoid sharp premultiplying the image. (optional, default `false`)
+    *   `options.create` **[Object][13]?** describes a new image to be created.
+
+        *   `options.create.width` **[number][14]?** integral number of pixels wide.
+        *   `options.create.height` **[number][14]?** integral number of pixels high.
+        *   `options.create.channels` **[number][14]?** integral number of channels, either 3 (RGB) or 4 (RGBA).
+        *   `options.create.background` **([string][12] | [Object][13])?** parsed by the [color][16] module to extract values for red, green, blue and alpha.
+        *   `options.create.noise` **[Object][13]?** describes a noise to be created.
+
+            *   `options.create.noise.type` **[string][12]?** type of generated noise, currently only `gaussian` is supported.
+            *   `options.create.noise.mean` **[number][14]?** mean of pixels in generated noise.
+            *   `options.create.noise.sigma` **[number][14]?** standard deviation of pixels in generated noise.
+    *   `options.text` **[Object][13]?** describes a new text image to be created.
+
+        *   `options.text.text` **[string][12]?** text to render as a UTF-8 string. It can contain Pango markup, for example `<i>Le</i>Monde`.
+        *   `options.text.font` **[string][12]?** font name to render with.
+        *   `options.text.fontfile` **[string][12]?** absolute filesystem path to a font file that can be used by `font`.
+        *   `options.text.width` **[number][14]** integral number of pixels to word-wrap at. Lines of text wider than this will be broken at word boundaries. (optional, default `0`)
+        *   `options.text.height` **[number][14]** integral number of pixels high. When defined, `dpi` will be ignored and the text will automatically fit the pixel resolution defined by `width` and `height`. Will be ignored if `width` is not specified or set to 0. (optional, default `0`)
+        *   `options.text.align` **[string][12]** text alignment (`'left'`, `'centre'`, `'center'`, `'right'`). (optional, default `'left'`)
+        *   `options.text.justify` **[boolean][15]** set this to true to apply justification to the text. (optional, default `false`)
+        *   `options.text.dpi` **[number][14]** the resolution (size) at which to render the text. Does not take effect if `height` is specified. (optional, default `72`)
+        *   `options.text.rgba` **[boolean][15]** set this to true to enable RGBA output. This is useful for colour emoji rendering, or support for pango markup features like `<span foreground="red">Red!</span>`. (optional, default `false`)
+        *   `options.text.spacing` **[number][14]** text line height in points. Will use the font line height if none is specified. (optional, default `0`)
 
 ### Examples
 
@@ -63,59 +103,167 @@ sharp({
 .then( ... );
 ```
 
--   Throws **[Error][7]** Invalid parameters
-
-Returns **[Sharp][8]** 
-
-### format
-
-An Object containing nested boolean values representing the available input and output formats/methods.
-
-#### Examples
-
 ```javascript
-console.log(sharp.format);
+// Convert an animated GIF to an animated WebP
+await sharp('in.gif', { animated: true }).toFile('out.webp');
 ```
 
-Returns **[Object][3]** 
-
-### versions
-
-An Object containing the version numbers of libvips and its dependencies.
-
-#### Examples
-
 ```javascript
-console.log(sharp.versions);
+// Read a raw array of pixels and save it to a png
+const input = Uint8Array.from([255, 255, 255, 0, 0, 0]); // or Uint8ClampedArray
+const image = sharp(input, {
+  // because the input does not contain its dimensions or how many channels it has
+  // we need to specify it in the constructor options
+  raw: {
+    width: 2,
+    height: 1,
+    channels: 3
+  }
+});
+await image.toFile('my-two-pixels.png');
 ```
 
-## queue
+```javascript
+// Generate RGB Gaussian noise
+await sharp({
+  create: {
+    width: 300,
+    height: 200,
+    channels: 3,
+    noise: {
+      type: 'gaussian',
+      mean: 128,
+      sigma: 30
+    }
+ }
+}).toFile('noise.png');
+```
 
-An EventEmitter that emits a `change` event when a task is either:
+```javascript
+// Generate an image from text
+await sharp({
+  text: {
+    text: 'Hello, world!',
+    width: 400, // max width
+    height: 300 // max height
+  }
+}).toFile('text_bw.png');
+```
 
--   queued, waiting for _libuv_ to provide a worker thread
+```javascript
--   complete
+// Generate an rgba image from text using pango markup and font
+await sharp({
+  text: {
+    text: '<span foreground="red">Red!</span><span background="cyan">blue</span>',
+    font: 'sans',
+    rgba: true,
+    dpi: 300
+  }
+}).toFile('text_rgba.png');
+```
+
+*   Throws **[Error][17]** Invalid parameters
+
+Returns **[Sharp][18]**&#x20;
+
+## clone
+
+Take a "snapshot" of the Sharp instance, returning a new instance.
+Cloned instances inherit the input of their parent instance.
+This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream.
 
 ### Examples
 
 ```javascript
-sharp.queue.on('change', function(queueLength) {
+const pipeline = sharp().rotate();
-  console.log('Queue contains ' + queueLength + ' task(s)');
+pipeline.clone().resize(800, 600).pipe(firstWritableStream);
-});
+pipeline.clone().extract({ left: 20, top: 20, width: 100, height: 100 }).pipe(secondWritableStream);
+readableStream.pipe(pipeline);
+// firstWritableStream receives auto-rotated, resized readableStream
+// secondWritableStream receives auto-rotated, extracted region of readableStream
 ```
 
-[1]: https://nodejs.org/api/buffer.html
+```javascript
+// Create a pipeline that will download an image, resize it and format it to different files
+// Using Promises to know when the pipeline is complete
+const fs = require("fs");
+const got = require("got");
+const sharpStream = sharp({ failOn: 'none' });
 
-[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+const promises = [];
 
-[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+promises.push(
+  sharpStream
+    .clone()
+    .jpeg({ quality: 100 })
+    .toFile("originalFile.jpg")
+);
 
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+promises.push(
+  sharpStream
+    .clone()
+    .resize({ width: 500 })
+    .jpeg({ quality: 80 })
+    .toFile("optimized-500.jpg")
+);
 
-[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+promises.push(
+  sharpStream
+    .clone()
+    .resize({ width: 500 })
+    .webp({ quality: 80 })
+    .toFile("optimized-500.webp")
+);
 
-[6]: https://www.npmjs.org/package/color
+// https://github.com/sindresorhus/got/blob/main/documentation/3-streams.md
+got.stream("https://www.example.com/some-file.jpg").pipe(sharpStream);
 
-[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+Promise.all(promises)
+  .then(res => { console.log("Done!", res); })
+  .catch(err => {
+    console.error("Error processing files, let's clean it up", err);
+    try {
+      fs.unlinkSync("originalFile.jpg");
+      fs.unlinkSync("optimized-500.jpg");
+      fs.unlinkSync("optimized-500.webp");
+    } catch (e) {}
+  });
+```
 
-[8]: #sharp
+Returns **[Sharp][18]**&#x20;
+
+[1]: http://nodejs.org/api/stream.html#stream_class_stream_duplex
+
+[2]: https://nodejs.org/api/buffer.html
+
+[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array
+
+[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray
+
+[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Int8Array
+
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array
+
+[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Int16Array
+
+[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array
+
+[9]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Int32Array
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Float32Array
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Float64Array
+
+[12]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[13]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[14]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[15]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[16]: https://www.npmjs.org/package/color
+
+[17]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[18]: #sharp

docs/api-input.md

@@ -1,50 +1,56 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->
 
-## clone
+## metadata
 
-Take a "snapshot" of the Sharp instance, returning a new instance.
+Fast access to (uncached) image metadata without decoding any compressed pixel data.
-Cloned instances inherit the input of their parent instance.
+
-This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream.
+This is taken from the header of the input image.
+It does not include operations, such as resize, to be applied to the output image.
+
+Dimensions in the response will respect the `page` and `pages` properties of the
+[constructor parameters][1].
+
+A `Promise` is returned when `callback` is not provided.
+
+*   `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
+*   `size`: Total size of image in bytes, for Stream and Buffer input only
+*   `width`: Number of pixels wide (EXIF orientation is not taken into consideration, see example below)
+*   `height`: Number of pixels high (EXIF orientation is not taken into consideration, see example below)
+*   `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][2]
+*   `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
+*   `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...][3]
+*   `density`: Number of pixels per inch (DPI), if present
+*   `chromaSubsampling`: String containing JPEG chroma subsampling, `4:2:0` or `4:4:4` for RGB, `4:2:0:4` or `4:4:4:4` for CMYK
+*   `isProgressive`: Boolean indicating whether the image is interlaced using a progressive scan
+*   `pages`: Number of pages/frames contained within the image, with support for TIFF, HEIF, PDF, animated GIF and animated WebP
+*   `pageHeight`: Number of pixels high each page in a multi-page image will be.
+*   `loop`: Number of times to loop an animated image, zero refers to a continuous loop.
+*   `delay`: Delay in ms between each page in an animated image, provided as an array of integers.
+*   `pagePrimary`: Number of the primary page in a HEIF image
+*   `levels`: Details of each level in a multi-level image provided as an array of objects, requires libvips compiled with support for OpenSlide
+*   `subifds`: Number of Sub Image File Directories in an OME-TIFF image
+*   `background`: Default background colour, if present, for PNG (bKGD) and GIF images, either an RGB Object or a single greyscale value
+*   `compression`: The encoder used to compress an HEIF file, `av1` (AVIF) or `hevc` (HEIC)
+*   `resolutionUnit`: The unit of resolution (density), either `inch` or `cm`, if present
+*   `hasProfile`: Boolean indicating the presence of an embedded ICC profile
+*   `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
+*   `orientation`: Number value of the EXIF Orientation header, if present
+*   `exif`: Buffer containing raw EXIF data, if present
+*   `icc`: Buffer containing raw [ICC][4] profile data, if present
+*   `iptc`: Buffer containing raw IPTC data, if present
+*   `xmp`: Buffer containing raw XMP data, if present
+*   `tifftagPhotoshop`: Buffer containing raw TIFFTAG\_PHOTOSHOP data, if present
+
+### Parameters
+
+*   `callback` **[Function][5]?** called with the arguments `(err, metadata)`
 
 ### Examples
 
 ```javascript
-const pipeline = sharp().rotate();
+const metadata = await sharp(input).metadata();
-pipeline.clone().resize(800, 600).pipe(firstWritableStream);
-pipeline.clone().extract({ left: 20, top: 20, width: 100, height: 100 }).pipe(secondWritableStream);
-readableStream.pipe(pipeline);
-// firstWritableStream receives auto-rotated, resized readableStream
-// secondWritableStream receives auto-rotated, extracted region of readableStream
 ```
 
-Returns **Sharp** 
-
-## metadata
-
-Fast access to (uncached) image metadata without decoding any compressed image data.
-A Promises/A+ promise is returned when `callback` is not provided.
-
--   `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
--   `width`: Number of pixels wide (EXIF orientation is not taken into consideration)
--   `height`: Number of pixels high (EXIF orientation is not taken into consideration)
--   `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][1]
--   `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
--   `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...][2]
--   `density`: Number of pixels per inch (DPI), if present
--   `hasProfile`: Boolean indicating the presence of an embedded ICC profile
--   `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
--   `orientation`: Number value of the EXIF Orientation header, if present
--   `exif`: Buffer containing raw EXIF data, if present
--   `icc`: Buffer containing raw [ICC][3] profile data, if present
--   `iptc`: Buffer containing raw IPTC data, if present
--   `xmp`: Buffer containing raw XMP data, if present
-
-### Parameters
-
--   `callback` **[Function][4]?** called with the arguments `(err, metadata)`
-
-### Examples
-
 ```javascript
 const image = sharp(inputJpg);
 image
@@ -60,30 +66,47 @@ image
   });
 ```
 
-Returns **([Promise][5]&lt;[Object][6]> | Sharp)** 
+```javascript
+// Based on EXIF rotation metadata, get the right-side-up width and height:
+
+const size = getNormalSize(await sharp(input).metadata());
+
+function getNormalSize({ width, height, orientation }) {
+  return (orientation || 0) >= 5
+    ? { width: height, height: width }
+    : { width, height };
+}
+```
+
+Returns **([Promise][6]<[Object][7]> | Sharp)**&#x20;
 
 ## stats
 
 Access to pixel-derived image statistics for every channel in the image.
-A Promise is returned when `callback` is not provided.
+A `Promise` is returned when `callback` is not provided.
 
--   `channels`: Array of channel statistics for each channel in the image. Each channel statistic contains
+*   `channels`: Array of channel statistics for each channel in the image. Each channel statistic contains
-    -   `min` (minimum value in the channel)
+    *   `min` (minimum value in the channel)
-    -   `max` (maximum value in the channel)
+    *   `max` (maximum value in the channel)
-    -   `sum` (sum of all values in a channel)
+    *   `sum` (sum of all values in a channel)
-    -   `squaresSum` (sum of squared values in a channel)
+    *   `squaresSum` (sum of squared values in a channel)
-    -   `mean` (mean of the values in a channel)
+    *   `mean` (mean of the values in a channel)
-    -   `stdev` (standard deviation for the values in a channel)
+    *   `stdev` (standard deviation for the values in a channel)
-    -   `minX` (x-coordinate of one of the pixel where the minimum lies)
+    *   `minX` (x-coordinate of one of the pixel where the minimum lies)
-    -   `minY` (y-coordinate of one of the pixel where the minimum lies)
+    *   `minY` (y-coordinate of one of the pixel where the minimum lies)
-    -   `maxX` (x-coordinate of one of the pixel where the maximum lies)
+    *   `maxX` (x-coordinate of one of the pixel where the maximum lies)
-    -   `maxY` (y-coordinate of one of the pixel where the maximum lies)
+    *   `maxY` (y-coordinate of one of the pixel where the maximum lies)
--   `isOpaque`: Value to identify if the image is opaque or transparent, based on the presence and use of alpha channel
+*   `isOpaque`: Is the image fully opaque? Will be `true` if the image has no alpha channel or if every pixel is fully opaque.
--   `entropy`: Histogram-based estimation of greyscale entropy, discarding alpha channel if any (experimental)
+*   `entropy`: Histogram-based estimation of greyscale entropy, discarding alpha channel if any.
+*   `sharpness`: Estimation of greyscale sharpness based on the standard deviation of a Laplacian convolution, discarding alpha channel if any.
+*   `dominant`: Object containing most dominant sRGB colour based on a 4096-bin 3D histogram.
+
+**Note**: Statistics are derived from the original input image. Any operations performed on the image must first be
+written to a buffer in order to run `stats` on the result (see third example).
 
 ### Parameters
 
--   `callback` **[Function][4]?** called with the arguments `(err, stats)`
+*   `callback` **[Function][5]?** called with the arguments `(err, stats)`
 
 ### Examples
 
@@ -96,50 +119,31 @@ image
   });
 ```
 
-Returns **[Promise][5]&lt;[Object][6]>** 
+```javascript
+const { entropy, sharpness, dominant } = await sharp(input).stats();
+const { r, g, b } = dominant;
+```
 
-## limitInputPixels
+```javascript
+const image = sharp(input);
+// store intermediate result
+const part = await image.extract(region).toBuffer();
+// create new instance to obtain statistics of extracted region
+const stats = await sharp(part).stats();
+```
 
-Do not process input images where the number of pixels (width _ height) exceeds this limit.
+Returns **[Promise][6]<[Object][7]>**&#x20;
-Assumes image dimensions contained in the input metadata can be trusted.
-The default limit is 268402689 (0x3FFF _ 0x3FFF) pixels.
 
-### Parameters
+[1]: /api-constructor#parameters
 
--   `limit` **([Number][7] \| [Boolean][8])** an integral Number of pixels, zero or false to remove limit, true to use default limit.
+[2]: https://www.libvips.org/API/current/VipsImage.html#VipsInterpretation
 
+[3]: https://www.libvips.org/API/current/VipsImage.html#VipsBandFormat
 
--   Throws **[Error][9]** Invalid limit
+[4]: https://www.npmjs.com/package/icc
 
-Returns **Sharp** 
+[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
 
-## sequentialRead
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
 
-An advanced setting that switches the libvips access method to `VIPS_ACCESS_SEQUENTIAL`.
+[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
-This will reduce memory usage and can improve performance on some systems.
-
-The default behaviour _before_ function call is `false`, meaning the libvips access method is not sequential.
-
-### Parameters
-
--   `sequentialRead` **[Boolean][8]**  (optional, default `true`)
-
-Returns **Sharp** 
-
-[1]: https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L636
-
-[2]: https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L672
-
-[3]: https://www.npmjs.com/package/icc
-
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
-
-[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
-
-[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
-
-[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
-
-[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
-
-[9]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error

docs/api-operation.md

@@ -5,20 +5,29 @@
 Rotate the output image by either an explicit angle
 or auto-orient based on the EXIF `Orientation` tag.
 
-If an angle is provided, it is converted to a valid 90/180/270deg rotation.
+If an angle is provided, it is converted to a valid positive degree rotation.
 For example, `-450` will produce a 270deg rotation.
 
+When rotating by an angle other than a multiple of 90,
+the background colour can be provided with the `background` option.
+
 If no angle is provided, it is determined from the EXIF data.
 Mirroring is supported and may infer the use of a flip operation.
 
 The use of `rotate` implies the removal of the EXIF `Orientation` tag, if any.
 
-Method order is important when both rotating and extracting regions,
+Only one rotation can occur per pipeline.
-for example `rotate(x).extract(y)` will produce a different result to `extract(y).rotate(x)`.
+Previous calls to `rotate` in the same pipeline will be ignored.
+
+Method order is important when rotating, resizing and/or extracting regions,
+for example `.rotate(x).extract(y)` will produce a different result to `.extract(y).rotate(x)`.
 
 ### Parameters
 
--   `angle` **[Number][1]** angle of rotation, must be a multiple of 90. (optional, default `auto`)
+*   `angle` **[number][1]** angle of rotation. (optional, default `auto`)
+*   `options` **[Object][2]?** if present, is an Object with optional attributes.
+
+    *   `options.background` **([string][3] | [Object][2])** parsed by the [color][4] module to extract values for red, green, blue and alpha. (optional, default `"#000000"`)
 
 ### Examples
 
@@ -34,89 +43,161 @@ const pipeline = sharp()
 readableStream.pipe(pipeline);
 ```
 
--   Throws **[Error][2]** Invalid parameters
-
-Returns **Sharp** 
-
-## extract
-
-Extract a region of the image.
-
--   Use `extract` before `resize` for pre-resize extraction.
--   Use `extract` after `resize` for post-resize extraction.
--   Use `extract` before and after for both.
-
-### Parameters
-
--   `options` **[Object][3]** 
-    -   `options.left` **[Number][1]** zero-indexed offset from left edge
-    -   `options.top` **[Number][1]** zero-indexed offset from top edge
-    -   `options.width` **[Number][1]** dimension of extracted image
-    -   `options.height` **[Number][1]** dimension of extracted image
-
-### Examples
-
 ```javascript
-sharp(input)
+const rotateThenResize = await sharp(input)
-  .extract({ left: left, top: top, width: width, height: height })
+  .rotate(90)
-  .toFile(output, function(err) {
+  .resize({ width: 16, height: 8, fit: 'fill' })
-    // Extract a region of the input image, saving in the same format.
+  .toBuffer();
-  });
+const resizeThenRotate = await sharp(input)
+  .resize({ width: 16, height: 8, fit: 'fill' })
+  .rotate(90)
+  .toBuffer();
 ```
 
-```javascript
+*   Throws **[Error][5]** Invalid parameters
-sharp(input)
-  .extract({ left: leftOffsetPre, top: topOffsetPre, width: widthPre, height: heightPre })
-  .resize(width, height)
-  .extract({ left: leftOffsetPost, top: topOffsetPost, width: widthPost, height: heightPost })
-  .toFile(output, function(err) {
-    // Extract a region, resize, then extract from the resized image
-  });
-```
 
--   Throws **[Error][2]** Invalid parameters
+Returns **Sharp** 
-
-Returns **Sharp** 
 
 ## flip
 
-Flip the image about the vertical Y axis. This always occurs after rotation, if any.
+Flip the image about the vertical Y axis. This always occurs before rotation, if any.
 The use of `flip` implies the removal of the EXIF `Orientation` tag, if any.
 
 ### Parameters
 
--   `flip` **[Boolean][4]**  (optional, default `true`)
+*   `flip` **[Boolean][6]**  (optional, default `true`)
 
-Returns **Sharp** 
+### Examples
+
+```javascript
+const output = await sharp(input).flip().toBuffer();
+```
+
+Returns **Sharp** 
 
 ## flop
 
-Flop the image about the horizontal X axis. This always occurs after rotation, if any.
+Flop the image about the horizontal X axis. This always occurs before rotation, if any.
 The use of `flop` implies the removal of the EXIF `Orientation` tag, if any.
 
 ### Parameters
 
--   `flop` **[Boolean][4]**  (optional, default `true`)
+*   `flop` **[Boolean][6]**  (optional, default `true`)
 
-Returns **Sharp** 
+### Examples
+
+```javascript
+const output = await sharp(input).flop().toBuffer();
+```
+
+Returns **Sharp** 
+
+## affine
+
+Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any.
+
+You must provide an array of length 4 or a 2x2 affine transformation matrix.
+By default, new pixels are filled with a black background. You can provide a background color with the `background` option.
+A particular interpolator may also be specified. Set the `interpolator` option to an attribute of the `sharp.interpolator` Object e.g. `sharp.interpolator.nohalo`.
+
+In the case of a 2x2 matrix, the transform is:
+
+*   X = `matrix[0, 0]` \* (x + `idx`) + `matrix[0, 1]` \* (y + `idy`) + `odx`
+*   Y = `matrix[1, 0]` \* (x + `idx`) + `matrix[1, 1]` \* (y + `idy`) + `ody`
+
+where:
+
+*   x and y are the coordinates in input image.
+*   X and Y are the coordinates in output image.
+*   (0,0) is the upper left corner.
+
+### Parameters
+
+*   `matrix` **([Array][7]<[Array][7]<[number][1]>> | [Array][7]<[number][1]>)** affine transformation matrix
+*   `options` **[Object][2]?** if present, is an Object with optional attributes.
+
+    *   `options.background` **([String][3] | [Object][2])** parsed by the [color][4] module to extract values for red, green, blue and alpha. (optional, default `"#000000"`)
+    *   `options.idx` **[Number][1]** input horizontal offset (optional, default `0`)
+    *   `options.idy` **[Number][1]** input vertical offset (optional, default `0`)
+    *   `options.odx` **[Number][1]** output horizontal offset (optional, default `0`)
+    *   `options.ody` **[Number][1]** output vertical offset (optional, default `0`)
+    *   `options.interpolator` **[String][3]** interpolator (optional, default `sharp.interpolators.bicubic`)
+
+### Examples
+
+```javascript
+const pipeline = sharp()
+  .affine([[1, 0.3], [0.1, 0.7]], {
+     background: 'white',
+     interpolate: sharp.interpolators.nohalo
+  })
+  .toBuffer((err, outputBuffer, info) => {
+     // outputBuffer contains the transformed image
+     // info.width and info.height contain the new dimensions
+  });
+
+inputStream
+  .pipe(pipeline);
+```
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.27.0
 
 ## sharpen
 
 Sharpen the image.
+
 When used without parameters, performs a fast, mild sharpen of the output image.
+
 When a `sigma` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space.
-Separate control over the level of sharpening in "flat" and "jagged" areas is available.
+Fine-grained control over the level of sharpening in "flat" (m1) and "jagged" (m2) areas is available.
+
+See [libvips sharpen][8] operation.
 
 ### Parameters
 
--   `sigma` **[Number][1]?** the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+*   `options` **([Object][2] | [number][1])?** if present, is an Object with attributes
--   `flat` **[Number][1]** the level of sharpening to apply to "flat" areas. (optional, default `1.0`)
--   `jagged` **[Number][1]** the level of sharpening to apply to "jagged" areas. (optional, default `2.0`)
 
+    *   `options.sigma` **[number][1]?** the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`, between 0.000001 and 10000
+    *   `options.m1` **[number][1]** the level of sharpening to apply to "flat" areas, between 0 and 1000000 (optional, default `1.0`)
+    *   `options.m2` **[number][1]** the level of sharpening to apply to "jagged" areas, between 0 and 1000000 (optional, default `2.0`)
+    *   `options.x1` **[number][1]** threshold between "flat" and "jagged", between 0 and 1000000 (optional, default `2.0`)
+    *   `options.y2` **[number][1]** maximum amount of brightening, between 0 and 1000000 (optional, default `10.0`)
+    *   `options.y3` **[number][1]** maximum amount of darkening, between 0 and 1000000 (optional, default `20.0`)
+*   `flat` **[number][1]?** (deprecated) see `options.m1`.
+*   `jagged` **[number][1]?** (deprecated) see `options.m2`.
 
--   Throws **[Error][2]** Invalid parameters
+### Examples
 
-Returns **Sharp** 
+```javascript
+const data = await sharp(input).sharpen().toBuffer();
+```
+
+```javascript
+const data = await sharp(input).sharpen({ sigma: 2 }).toBuffer();
+```
+
+```javascript
+const data = await sharp(input)
+  .sharpen({
+    sigma: 2,
+    m1: 0,
+    m2: 3,
+    x1: 3,
+    y2: 15,
+    y3: 15,
+  })
+  .toBuffer();
+```
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
 
 ## median
 
@@ -125,79 +206,73 @@ When used without parameters the default window is 3x3.
 
 ### Parameters
 
--   `size` **[Number][1]** square mask size: size x size (optional, default `3`)
+*   `size` **[number][1]** square mask size: size x size (optional, default `3`)
-
-
--   Throws **[Error][2]** Invalid parameters
-
-Returns **Sharp** 
-
-## blur
-
-Blur the image.
-When used without parameters, performs a fast, mild blur of the output image.
-When a `sigma` is provided, performs a slower, more accurate Gaussian blur.
-
-### Parameters
-
--   `sigma` **[Number][1]?** a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
-
-
--   Throws **[Error][2]** Invalid parameters
-
-Returns **Sharp** 
-
-## extend
-
-Extends/pads the edges of the image with the colour provided to the `background` method.
-This operation will always occur after resizing and extraction, if any.
-
-### Parameters
-
--   `extend` **([Number][1] \| [Object][3])** single pixel count to add to all edges or an Object with per-edge counts
-    -   `extend.top` **[Number][1]?** 
-    -   `extend.left` **[Number][1]?** 
-    -   `extend.bottom` **[Number][1]?** 
-    -   `extend.right` **[Number][1]?** 
 
 ### Examples
 
 ```javascript
-// Resize to 140 pixels wide, then add 10 transparent pixels
+const output = await sharp(input).median().toBuffer();
-// to the top, left and right edges and 20 to the bottom edge
-sharp(input)
-  .resize(140)
-  .background({r: 0, g: 0, b: 0, alpha: 0})
-  .extend({top: 10, bottom: 20, left: 10, right: 10})
-  ...
 ```
 
--   Throws **[Error][2]** Invalid parameters
+```javascript
+const output = await sharp(input).median(5).toBuffer();
+```
 
-Returns **Sharp** 
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+## blur
+
+Blur the image.
+
+When used without parameters, performs a fast 3x3 box blur (equivalent to a box linear filter).
+
+When a `sigma` is provided, performs a slower, more accurate Gaussian blur.
+
+### Parameters
+
+*   `sigma` **[number][1]?** a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+
+### Examples
+
+```javascript
+const boxBlurred = await sharp(input)
+  .blur()
+  .toBuffer();
+```
+
+```javascript
+const gaussianBlurred = await sharp(input)
+  .blur(5)
+  .toBuffer();
+```
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
 
 ## flatten
 
-Merge alpha transparency channel, if any, with `background`.
+Merge alpha transparency channel, if any, with a background, then remove the alpha channel.
+
+See also [removeAlpha][9].
 
 ### Parameters
 
--   `flatten` **[Boolean][4]**  (optional, default `true`)
+*   `options` **[Object][2]?**&#x20;
 
-Returns **Sharp** 
+    *   `options.background` **([string][3] | [Object][2])** background colour, parsed by the [color][4] module, defaults to black. (optional, default `{r:0,g:0,b:0}`)
 
-## trim
+### Examples
 
-Trim "boring" pixels from all edges that contain values within a percentage similarity of the top-left pixel.
+```javascript
+await sharp(rgbaInput)
+  .flatten({ background: '#F0A703' })
+  .toBuffer();
+```
 
-### Parameters
+Returns **Sharp**&#x20;
-
--   `tolerance` **[Number][1]** value between 1 and 99 representing the percentage similarity. (optional, default `10`)
-
-
--   Throws **[Error][2]** Invalid parameters
-
-Returns **Sharp** 
 
 ## gamma
 
@@ -207,14 +282,18 @@ This can improve the perceived brightness of a resized image in non-linear colou
 JPEG and WebP input images will not take advantage of the shrink-on-load performance optimisation
 when applying a gamma correction.
 
+Supply a second argument to use a different output gamma value, otherwise the first value is used in both cases.
+
 ### Parameters
 
--   `gamma` **[Number][1]** value between 1.0 and 3.0. (optional, default `2.2`)
+*   `gamma` **[number][1]** value between 1.0 and 3.0. (optional, default `2.2`)
+*   `gammaOut` **[number][1]?** value between 1.0 and 3.0. (optional, defaults to same as `gamma`)
 
+<!---->
 
--   Throws **[Error][2]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
 
 ## negate
 
@@ -222,9 +301,25 @@ Produce the "negative" of the image.
 
 ### Parameters
 
--   `negate` **[Boolean][4]**  (optional, default `true`)
+*   `options` **[Object][2]?**&#x20;
 
-Returns **Sharp** 
+    *   `options.alpha` **[Boolean][6]** Whether or not to negate any alpha channel (optional, default `true`)
+
+### Examples
+
+```javascript
+const output = await sharp(input)
+  .negate()
+  .toBuffer();
+```
+
+```javascript
+const output = await sharp(input)
+  .negate({ alpha: false })
+  .toBuffer();
+```
+
+Returns **Sharp**&#x20;
 
 ## normalise
 
@@ -232,9 +327,15 @@ Enhance output image contrast by stretching its luminance to cover the full dyna
 
 ### Parameters
 
--   `normalise` **[Boolean][4]**  (optional, default `true`)
+*   `normalise` **[Boolean][6]**  (optional, default `true`)
 
-Returns **Sharp** 
+### Examples
+
+```javascript
+const output = await sharp(input).normalise().toBuffer();
+```
+
+Returns **Sharp**&#x20;
 
 ## normalize
 
@@ -242,9 +343,51 @@ Alternative spelling of normalise.
 
 ### Parameters
 
--   `normalize` **[Boolean][4]**  (optional, default `true`)
+*   `normalize` **[Boolean][6]**  (optional, default `true`)
 
-Returns **Sharp** 
+### Examples
+
+```javascript
+const output = await sharp(input).normalize().toBuffer();
+```
+
+Returns **Sharp**&#x20;
+
+## clahe
+
+Perform contrast limiting adaptive histogram equalization
+[CLAHE][10].
+
+This will, in general, enhance the clarity of the image by bringing out darker details.
+
+### Parameters
+
+*   `options` **[Object][2]**&#x20;
+
+    *   `options.width` **[number][1]** integer width of the region in pixels.
+    *   `options.height` **[number][1]** integer height of the region in pixels.
+    *   `options.maxSlope` **[number][1]** maximum value for the slope of the
+        cumulative histogram. A value of 0 disables contrast limiting. Valid values
+        are integers in the range 0-100 (inclusive) (optional, default `3`)
+
+### Examples
+
+```javascript
+const output = await sharp(input)
+  .clahe({
+    width: 3,
+    height: 3,
+  })
+  .toBuffer();
+```
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.28.3
 
 ## convolve
 
@@ -252,12 +395,13 @@ Convolve the image with the specified kernel.
 
 ### Parameters
 
--   `kernel` **[Object][3]** 
+*   `kernel` **[Object][2]**&#x20;
-    -   `kernel.width` **[Number][1]** width of the kernel in pixels.
+
-    -   `kernel.height` **[Number][1]** width of the kernel in pixels.
+    *   `kernel.width` **[number][1]** width of the kernel in pixels.
-    -   `kernel.kernel` **[Array][5]&lt;[Number][1]>** Array of length `width*height` containing the kernel values.
+    *   `kernel.height` **[number][1]** height of the kernel in pixels.
-    -   `kernel.scale` **[Number][1]** the scale of the kernel in pixels. (optional, default `sum`)
+    *   `kernel.kernel` **[Array][7]<[number][1]>** Array of length `width*height` containing the kernel values.
-    -   `kernel.offset` **[Number][1]** the offset of the kernel in pixels. (optional, default `0`)
+    *   `kernel.scale` **[number][1]** the scale of the kernel in pixels. (optional, default `sum`)
+    *   `kernel.offset` **[number][1]** the offset of the kernel in pixels. (optional, default `0`)
 
 ### Examples
 
@@ -275,25 +419,27 @@ sharp(input)
   });
 ```
 
--   Throws **[Error][2]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
 
 ## threshold
 
-Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
+Any pixel value greater than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
 
 ### Parameters
 
--   `threshold` **[Number][1]** a value in the range 0-255 representing the level at which the threshold will be applied. (optional, default `128`)
+*   `threshold` **[number][1]** a value in the range 0-255 representing the level at which the threshold will be applied. (optional, default `128`)
--   `options` **[Object][3]?** 
+*   `options` **[Object][2]?**&#x20;
-    -   `options.greyscale` **[Boolean][4]** convert to single channel greyscale. (optional, default `true`)
-    -   `options.grayscale` **[Boolean][4]** alternative spelling for greyscale. (optional, default `true`)
 
+    *   `options.greyscale` **[Boolean][6]** convert to single channel greyscale. (optional, default `true`)
+    *   `options.grayscale` **[Boolean][6]** alternative spelling for greyscale. (optional, default `true`)
 
--   Throws **[Error][2]** Invalid parameters
+<!---->
 
-Returns **Sharp** 
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
 
 ## boolean
 
@@ -304,43 +450,166 @@ the selected bitwise boolean `operation` between the corresponding pixels of the
 
 ### Parameters
 
--   `operand` **([Buffer][6] \| [String][7])** Buffer containing image data or String containing the path to an image file.
+*   `operand` **([Buffer][11] | [string][3])** Buffer containing image data or string containing the path to an image file.
--   `operator` **[String][7]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+*   `operator` **[string][3]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
--   `options` **[Object][3]?** 
+*   `options` **[Object][2]?**&#x20;
-    -   `options.raw` **[Object][3]?** describes operand when using raw pixel data.
-        -   `options.raw.width` **[Number][1]?** 
-        -   `options.raw.height` **[Number][1]?** 
-        -   `options.raw.channels` **[Number][1]?** 
 
+    *   `options.raw` **[Object][2]?** describes operand when using raw pixel data.
 
--   Throws **[Error][2]** Invalid parameters
+        *   `options.raw.width` **[number][1]?**&#x20;
+        *   `options.raw.height` **[number][1]?**&#x20;
+        *   `options.raw.channels` **[number][1]?**&#x20;
 
-Returns **Sharp** 
+<!---->
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
 
 ## linear
 
-Apply the linear formula a \* input + b to the image (levels adjustment)
+Apply the linear formula `a` \* input + `b` to the image to adjust image levels.
+
+When a single number is provided, it will be used for all image channels.
+When an array of numbers is provided, the array length must match the number of channels.
 
 ### Parameters
 
--   `a` **[Number][1]** multiplier (optional, default `1.0`)
+*   `a` **([number][1] | [Array][7]<[number][1]>)** multiplier (optional, default `[]`)
--   `b` **[Number][1]** offset (optional, default `0.0`)
+*   `b` **([number][1] | [Array][7]<[number][1]>)** offset (optional, default `[]`)
 
+### Examples
 
--   Throws **[Error][2]** Invalid parameters
+```javascript
+await sharp(input)
+  .linear(0.5, 2)
+  .toBuffer();
+```
 
-Returns **Sharp** 
+```javascript
+await sharp(rgbInput)
+  .linear(
+    [0.25, 0.5, 0.75],
+    [150, 100, 50]
+  )
+  .toBuffer();
+```
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+## recomb
+
+Recomb the image with the specified matrix.
+
+### Parameters
+
+*   `inputMatrix` **[Array][7]<[Array][7]<[number][1]>>** 3x3 Recombination matrix
+
+### Examples
+
+```javascript
+sharp(input)
+  .recomb([
+   [0.3588, 0.7044, 0.1368],
+   [0.2990, 0.5870, 0.1140],
+   [0.2392, 0.4696, 0.0912],
+  ])
+  .raw()
+  .toBuffer(function(err, data, info) {
+    // data contains the raw pixel data after applying the recomb
+    // With this example input, a sepia filter has been applied
+  });
+```
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.21.1
+
+## modulate
+
+Transforms the image using brightness, saturation, hue rotation, and lightness.
+Brightness and lightness both operate on luminance, with the difference being that
+brightness is multiplicative whereas lightness is additive.
+
+### Parameters
+
+*   `options` **[Object][2]?**&#x20;
+
+    *   `options.brightness` **[number][1]?** Brightness multiplier
+    *   `options.saturation` **[number][1]?** Saturation multiplier
+    *   `options.hue` **[number][1]?** Degrees for hue rotation
+    *   `options.lightness` **[number][1]?** Lightness addend
+
+### Examples
+
+```javascript
+// increase brightness by a factor of 2
+const output = await sharp(input)
+  .modulate({
+    brightness: 2
+  })
+  .toBuffer();
+```
+
+```javascript
+// hue-rotate by 180 degrees
+const output = await sharp(input)
+  .modulate({
+    hue: 180
+  })
+  .toBuffer();
+```
+
+```javascript
+// increase lightness by +50
+const output = await sharp(input)
+  .modulate({
+    lightness: 50
+  })
+  .toBuffer();
+```
+
+```javascript
+// decreate brightness and saturation while also hue-rotating by 90 degrees
+const output = await sharp(input)
+  .modulate({
+    brightness: 0.5,
+    saturation: 0.5,
+    hue: 90,
+  })
+  .toBuffer();
+```
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.22.1
 
 [1]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
 
-[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
 
-[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
 
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+[4]: https://www.npmjs.org/package/color
 
-[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
+[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
 
-[6]: https://nodejs.org/api/buffer.html
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
 
-[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
+
+[8]: https://www.libvips.org/API/current/libvips-convolution.html#vips-sharpen
+
+[9]: /api-channel#removealpha
+
+[10]: https://en.wikipedia.org/wiki/Adaptive_histogram_equalization#Contrast_Limited_AHE
+
+[11]: https://nodejs.org/api/buffer.html

docs/api-output.md

@@ -5,18 +5,24 @@
 Write output image data to a file.
 
 If an explicit output format is not selected, it will be inferred from the extension,
-with JPEG, PNG, WebP, TIFF, DZI, and libvips' V format supported.
+with JPEG, PNG, WebP, AVIF, TIFF, GIF, DZI, and libvips' V format supported.
 Note that raw pixel data is only supported for buffer output.
 
+By default all metadata will be removed, which includes EXIF-based orientation.
+See [withMetadata][1] for control over this.
+
+The caller is responsible for ensuring directory structures and permissions exist.
+
 A `Promise` is returned when `callback` is not provided.
 
 ### Parameters
 
--   `fileOut` **[String][1]** the path to write the image data to.
+*   `fileOut` **[string][2]** the path to write the image data to.
--   `callback` **[Function][2]?** called on completion with two arguments `(err, info)`.
+*   `callback` **[Function][3]?** called on completion with two arguments `(err, info)`.
     `info` contains the output image `format`, `size` (bytes), `width`, `height`,
     `channels` and `premultiplied` (indicating if premultiplication was used).
     When using a crop strategy also contains `cropOffsetLeft` and `cropOffsetTop`.
+    May also contain `textAutofitDpi` (dpi the font was rendered at) if image was created from text.
 
 ### Examples
 
@@ -32,31 +38,39 @@ sharp(input)
   .catch(err => { ... });
 ```
 
--   Throws **[Error][3]** Invalid parameters
+*   Throws **[Error][4]** Invalid parameters
 
-Returns **[Promise][4]<[Object][5]>** when no callback is provided
+Returns **[Promise][5]<[Object][6]>** when no callback is provided
 
 ## toBuffer
 
 Write output to a Buffer.
-JPEG, PNG, WebP, TIFF and RAW output are supported.
+JPEG, PNG, WebP, AVIF, TIFF, GIF and raw pixel data output are supported.
-By default, the format will match the input image, except GIF and SVG input which become PNG output.
+
+Use [toFormat][7] or one of the format-specific functions such as [jpeg][8], [png][9] etc. to set the output format.
+
+If no explicit format is set, the output format will match the input image, except SVG input which becomes PNG output.
+
+By default all metadata will be removed, which includes EXIF-based orientation.
+See [withMetadata][1] for control over this.
 
 `callback`, if present, gets three arguments `(err, data, info)` where:
 
--   `err` is an error, if any.
+*   `err` is an error, if any.
--   `data` is the output image data.
+*   `data` is the output image data.
--   `info` contains the output image `format`, `size` (bytes), `width`, `height`,
+*   `info` contains the output image `format`, `size` (bytes), `width`, `height`,
     `channels` and `premultiplied` (indicating if premultiplication was used).
     When using a crop strategy also contains `cropOffsetLeft` and `cropOffsetTop`.
+    May also contain `textAutofitDpi` (dpi the font was rendered at) if image was created from text.
 
 A `Promise` is returned when `callback` is not provided.
 
 ### Parameters
 
--   `options` **[Object][5]?** 
+*   `options` **[Object][6]?**&#x20;
-    -   `options.resolveWithObject` **[Boolean][6]?** Resolve the Promise with an Object containing `data` and `info` properties instead of resolving only with `data`.
+
--   `callback` **[Function][2]?** 
+    *   `options.resolveWithObject` **[boolean][10]?** Resolve the Promise with an Object containing `data` and `info` properties instead of resolving only with `data`.
+*   `callback` **[Function][3]?**&#x20;
 
 ### Examples
 
@@ -74,23 +88,50 @@ sharp(input)
 
 ```javascript
 sharp(input)
+  .png()
   .toBuffer({ resolveWithObject: true })
   .then(({ data, info }) => { ... })
   .catch(err => { ... });
 ```
 
-Returns **[Promise][4]&lt;[Buffer][7]>** when no callback is provided
+```javascript
+const { data, info } = await sharp('my-image.jpg')
+  // output the raw pixels
+  .raw()
+  .toBuffer({ resolveWithObject: true });
+
+// create a more type safe way to work with the raw pixel data
+// this will not copy the data, instead it will change `data`s underlying ArrayBuffer
+// so `data` and `pixelArray` point to the same memory location
+const pixelArray = new Uint8ClampedArray(data.buffer);
+
+// When you are done changing the pixelArray, sharp takes the `pixelArray` as an input
+const { width, height, channels } = info;
+await sharp(pixelArray, { raw: { width, height, channels } })
+  .toFile('my-changed-image.jpg');
+```
+
+Returns **[Promise][5]<[Buffer][11]>** when no callback is provided
 
 ## withMetadata
 
 Include all metadata (EXIF, XMP, IPTC) from the input image in the output image.
-The default behaviour, when `withMetadata` is not used, is to strip all metadata and convert to the device-independent sRGB colour space.
+This will also convert to and add a web-friendly sRGB ICC profile unless a custom
-This will also convert to and add a web-friendly sRGB ICC profile.
+output profile is provided.
+
+The default behaviour, when `withMetadata` is not used, is to convert to the device-independent
+sRGB colour space and strip all metadata, including the removal of any ICC profile.
+
+EXIF metadata is unsupported for TIFF output.
 
 ### Parameters
 
--   `withMetadata` **[Object][5]?** 
+*   `options` **[Object][6]?**&#x20;
-    -   `withMetadata.orientation` **[Number][8]?** value between 1 and 8, used to update the EXIF `Orientation` tag.
+
+    *   `options.orientation` **[number][12]?** value between 1 and 8, used to update the EXIF `Orientation` tag.
+    *   `options.icc` **[string][2]?** filesystem path to output ICC profile, defaults to sRGB.
+    *   `options.exif` **[Object][6]<[Object][6]>** Object keyed by IFD0, IFD1 etc. of key/value string pairs to write as EXIF data. (optional, default `{}`)
+    *   `options.density` **[number][12]?** Number of pixels per inch (DPI).
 
 ### Examples
 
@@ -101,9 +142,51 @@ sharp('input.jpg')
   .then(info => { ... });
 ```
 
--   Throws **[Error][3]** Invalid parameters
+```javascript
+// Set "IFD0-Copyright" in output EXIF metadata
+const data = await sharp(input)
+  .withMetadata({
+    exif: {
+      IFD0: {
+        Copyright: 'Wernham Hogg'
+      }
+    }
+  })
+  .toBuffer();
+```
 
-Returns **Sharp** 
+```javascript
+// Set output metadata to 96 DPI
+const data = await sharp(input)
+  .withMetadata({ density: 96 })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+## toFormat
+
+Force output to a given format.
+
+### Parameters
+
+*   `format` **([string][2] | [Object][6])** as a string or an Object with an 'id' attribute
+*   `options` **[Object][6]** output options
+
+### Examples
+
+```javascript
+// Convert any input to PNG output
+const data = await sharp(input)
+  .toFormat('png')
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** unsupported format or options
+
+Returns **Sharp**&#x20;
 
 ## jpeg
 
@@ -111,19 +194,21 @@ Use these JPEG options for output image.
 
 ### Parameters
 
--   `options` **[Object][5]?** output options
+*   `options` **[Object][6]?** output options
-    -   `options.quality` **[Number][8]** quality, integer 1-100 (optional, default `80`)
+
-    -   `options.progressive` **[Boolean][6]** use progressive (interlace) scan (optional, default `false`)
+    *   `options.quality` **[number][12]** quality, integer 1-100 (optional, default `80`)
-    -   `options.chromaSubsampling` **[String][1]** set to '4:4:4' to prevent chroma subsampling when quality &lt;= 90 (optional, default `'4:2:0'`)
+    *   `options.progressive` **[boolean][10]** use progressive (interlace) scan (optional, default `false`)
-    -   `options.trellisQuantisation` **[Boolean][6]** apply trellis quantisation, requires mozjpeg (optional, default `false`)
+    *   `options.chromaSubsampling` **[string][2]** set to '4:4:4' to prevent chroma subsampling otherwise defaults to '4:2:0' chroma subsampling (optional, default `'4:2:0'`)
-    -   `options.overshootDeringing` **[Boolean][6]** apply overshoot deringing, requires mozjpeg (optional, default `false`)
+    *   `options.optimiseCoding` **[boolean][10]** optimise Huffman coding tables (optional, default `true`)
-    -   `options.optimiseScans` **[Boolean][6]** optimise progressive scans, forces progressive, requires mozjpeg (optional, default `false`)
+    *   `options.optimizeCoding` **[boolean][10]** alternative spelling of optimiseCoding (optional, default `true`)
-    -   `options.optimizeScans` **[Boolean][6]** alternative spelling of optimiseScans (optional, default `false`)
+    *   `options.mozjpeg` **[boolean][10]** use mozjpeg defaults, equivalent to `{ trellisQuantisation: true, overshootDeringing: true, optimiseScans: true, quantisationTable: 3 }` (optional, default `false`)
-    -   `options.optimiseCoding` **[Boolean][6]** optimise Huffman coding tables (optional, default `true`)
+    *   `options.trellisQuantisation` **[boolean][10]** apply trellis quantisation (optional, default `false`)
-    -   `options.optimizeCoding` **[Boolean][6]** alternative spelling of optimiseCoding (optional, default `true`)
+    *   `options.overshootDeringing` **[boolean][10]** apply overshoot deringing (optional, default `false`)
-    -   `options.quantisationTable` **[Number][8]** quantization table to use, integer 0-8, requires mozjpeg (optional, default `0`)
+    *   `options.optimiseScans` **[boolean][10]** optimise progressive scans, forces progressive (optional, default `false`)
-    -   `options.quantizationTable` **[Number][8]** alternative spelling of quantisationTable (optional, default `0`)
+    *   `options.optimizeScans` **[boolean][10]** alternative spelling of optimiseScans (optional, default `false`)
-    -   `options.force` **[Boolean][6]** force JPEG output, otherwise attempt to use input format (optional, default `true`)
+    *   `options.quantisationTable` **[number][12]** quantization table to use, integer 0-8 (optional, default `0`)
+    *   `options.quantizationTable` **[number][12]** alternative spelling of quantisationTable (optional, default `0`)
+    *   `options.force` **[boolean][10]** force JPEG output, otherwise attempt to use input format (optional, default `true`)
 
 ### Examples
 
@@ -137,37 +222,59 @@ const data = await sharp(input)
   .toBuffer();
 ```
 
--   Throws **[Error][3]** Invalid options
+```javascript
+// Use mozjpeg to reduce output JPEG file size (slower)
+const data = await sharp(input)
+  .jpeg({ mozjpeg: true })
+  .toBuffer();
+```
 
-Returns **Sharp** 
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
 
 ## png
 
 Use these PNG options for output image.
 
-PNG output is always full colour at 8 or 16 bits per pixel.
+By default, PNG output is full colour at 8 or 16 bits per pixel.
 Indexed PNG input at 1, 2 or 4 bits per pixel is converted to 8 bits per pixel.
+Set `palette` to `true` for slower, indexed PNG output.
 
 ### Parameters
 
--   `options` **[Object][5]?** 
+*   `options` **[Object][6]?**&#x20;
-    -   `options.progressive` **[Boolean][6]** use progressive (interlace) scan (optional, default `false`)
+
-    -   `options.compressionLevel` **[Number][8]** zlib compression level, 0-9 (optional, default `9`)
+    *   `options.progressive` **[boolean][10]** use progressive (interlace) scan (optional, default `false`)
-    -   `options.adaptiveFiltering` **[Boolean][6]** use adaptive row filtering (optional, default `false`)
+    *   `options.compressionLevel` **[number][12]** zlib compression level, 0 (fastest, largest) to 9 (slowest, smallest) (optional, default `6`)
-    -   `options.force` **[Boolean][6]** force PNG output, otherwise attempt to use input format (optional, default `true`)
+    *   `options.adaptiveFiltering` **[boolean][10]** use adaptive row filtering (optional, default `false`)
+    *   `options.palette` **[boolean][10]** quantise to a palette-based image with alpha transparency support (optional, default `false`)
+    *   `options.quality` **[number][12]** use the lowest number of colours needed to achieve given quality, sets `palette` to `true` (optional, default `100`)
+    *   `options.effort` **[number][12]** CPU effort, between 1 (fastest) and 10 (slowest), sets `palette` to `true` (optional, default `7`)
+    *   `options.colours` **[number][12]** maximum number of palette entries, sets `palette` to `true` (optional, default `256`)
+    *   `options.colors` **[number][12]** alternative spelling of `options.colours`, sets `palette` to `true` (optional, default `256`)
+    *   `options.dither` **[number][12]** level of Floyd-Steinberg error diffusion, sets `palette` to `true` (optional, default `1.0`)
+    *   `options.force` **[boolean][10]** force PNG output, otherwise attempt to use input format (optional, default `true`)
 
 ### Examples
 
 ```javascript
-// Convert any input to PNG output
+// Convert any input to full colour PNG output
 const data = await sharp(input)
   .png()
   .toBuffer();
 ```
 
--   Throws **[Error][3]** Invalid options
+```javascript
+// Convert any input to indexed PNG output (slower)
+const data = await sharp(input)
+  .png({ palette: true })
+  .toBuffer();
+```
 
-Returns **Sharp** 
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
 
 ## webp
 
@@ -175,12 +282,19 @@ Use these WebP options for output image.
 
 ### Parameters
 
--   `options` **[Object][5]?** output options
+*   `options` **[Object][6]?** output options
-    -   `options.quality` **[Number][8]** quality, integer 1-100 (optional, default `80`)
+
-    -   `options.alphaQuality` **[Number][8]** quality of alpha layer, integer 0-100 (optional, default `100`)
+    *   `options.quality` **[number][12]** quality, integer 1-100 (optional, default `80`)
-    -   `options.lossless` **[Boolean][6]** use lossless compression mode (optional, default `false`)
+    *   `options.alphaQuality` **[number][12]** quality of alpha layer, integer 0-100 (optional, default `100`)
-    -   `options.nearLossless` **[Boolean][6]** use near_lossless compression mode (optional, default `false`)
+    *   `options.lossless` **[boolean][10]** use lossless compression mode (optional, default `false`)
-    -   `options.force` **[Boolean][6]** force WebP output, otherwise attempt to use input format (optional, default `true`)
+    *   `options.nearLossless` **[boolean][10]** use near\_lossless compression mode (optional, default `false`)
+    *   `options.smartSubsample` **[boolean][10]** use high quality chroma subsampling (optional, default `false`)
+    *   `options.effort` **[number][12]** CPU effort, between 0 (fastest) and 6 (slowest) (optional, default `4`)
+    *   `options.loop` **[number][12]** number of animation iterations, use 0 for infinite animation (optional, default `0`)
+    *   `options.delay` **([number][12] | [Array][13]<[number][12]>)?** delay(s) between animation frames (in milliseconds)
+    *   `options.minSize` **[boolean][10]** prevent use of animation key frames to minimise file size (slow) (optional, default `false`)
+    *   `options.mixed` **[boolean][10]** allow mixture of lossy and lossless animation frames (slow) (optional, default `false`)
+    *   `options.force` **[boolean][10]** force WebP output, otherwise attempt to use input format (optional, default `true`)
 
 ### Examples
 
@@ -191,24 +305,146 @@ const data = await sharp(input)
   .toBuffer();
 ```
 
--   Throws **[Error][3]** Invalid options
+```javascript
+// Optimise the file size of an animated WebP
+const outputWebp = await sharp(inputWebp, { animated: true })
+  .webp({ effort: 6 })
+  .toBuffer();
+```
 
-Returns **Sharp** 
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
+
+## gif
+
+Use these GIF options for the output image.
+
+The first entry in the palette is reserved for transparency.
+
+The palette of the input image will be re-used if possible.
+
+### Parameters
+
+*   `options` **[Object][6]?** output options
+
+    *   `options.reoptimise` **[boolean][10]** always generate new palettes (slow), re-use existing by default (optional, default `false`)
+    *   `options.reoptimize` **[boolean][10]** alternative spelling of `options.reoptimise` (optional, default `false`)
+    *   `options.colours` **[number][12]** maximum number of palette entries, including transparency, between 2 and 256 (optional, default `256`)
+    *   `options.colors` **[number][12]** alternative spelling of `options.colours` (optional, default `256`)
+    *   `options.effort` **[number][12]** CPU effort, between 1 (fastest) and 10 (slowest) (optional, default `7`)
+    *   `options.dither` **[number][12]** level of Floyd-Steinberg error diffusion, between 0 (least) and 1 (most) (optional, default `1.0`)
+    *   `options.interFrameMaxError` **[number][12]** maximum inter-frame error for transparency, between 0 (lossless) and 32 (optional, default `0`)
+    *   `options.interPaletteMaxError` **[number][12]** maximum inter-palette error for palette reuse, between 0 and 256 (optional, default `3`)
+    *   `options.loop` **[number][12]** number of animation iterations, use 0 for infinite animation (optional, default `0`)
+    *   `options.delay` **([number][12] | [Array][13]<[number][12]>)?** delay(s) between animation frames (in milliseconds)
+    *   `options.force` **[boolean][10]** force GIF output, otherwise attempt to use input format (optional, default `true`)
+
+### Examples
+
+```javascript
+// Convert PNG to GIF
+await sharp(pngBuffer)
+  .gif()
+  .toBuffer();
+```
+
+```javascript
+// Convert animated WebP to animated GIF
+await sharp('animated.webp', { animated: true })
+  .toFile('animated.gif');
+```
+
+```javascript
+// Create a 128x128, cropped, non-dithered, animated thumbnail of an animated GIF
+const out = await sharp('in.gif', { animated: true })
+  .resize({ width: 128, height: 128 })
+  .gif({ dither: 0 })
+  .toBuffer();
+```
+
+```javascript
+// Lossy file size reduction of animated GIF
+await sharp('in.gif', { animated: true })
+  .gif({ interFrameMaxError: 8 })
+  .toFile('optim.gif');
+```
+
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.30.0
+
+## jp2
+
+Use these JP2 options for output image.
+
+Requires libvips compiled with support for OpenJPEG.
+The prebuilt binaries do not include this - see
+[installing a custom libvips][14].
+
+### Parameters
+
+*   `options` **[Object][6]?** output options
+
+    *   `options.quality` **[number][12]** quality, integer 1-100 (optional, default `80`)
+    *   `options.lossless` **[boolean][10]** use lossless compression mode (optional, default `false`)
+    *   `options.tileWidth` **[number][12]** horizontal tile size (optional, default `512`)
+    *   `options.tileHeight` **[number][12]** vertical tile size (optional, default `512`)
+    *   `options.chromaSubsampling` **[string][2]** set to '4:2:0' to use chroma subsampling (optional, default `'4:4:4'`)
+
+### Examples
+
+```javascript
+// Convert any input to lossless JP2 output
+const data = await sharp(input)
+  .jp2({ lossless: true })
+  .toBuffer();
+```
+
+```javascript
+// Convert any input to very high quality JP2 output
+const data = await sharp(input)
+  .jp2({
+    quality: 100,
+    chromaSubsampling: '4:4:4'
+  })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.29.1
 
 ## tiff
 
 Use these TIFF options for output image.
 
+The `density` can be set in pixels/inch via [withMetadata][1] instead of providing `xres` and `yres` in pixels/mm.
+
 ### Parameters
 
--   `options` **[Object][5]?** output options
+*   `options` **[Object][6]?** output options
-    -   `options.quality` **[Number][8]** quality, integer 1-100 (optional, default `80`)
+
-    -   `options.force` **[Boolean][6]** force TIFF output, otherwise attempt to use input format (optional, default `true`)
+    *   `options.quality` **[number][12]** quality, integer 1-100 (optional, default `80`)
-    -   `options.compression` **[Boolean][6]** compression options: lzw, deflate, jpeg, ccittfax4 (optional, default `'jpeg'`)
+    *   `options.force` **[boolean][10]** force TIFF output, otherwise attempt to use input format (optional, default `true`)
-    -   `options.predictor` **[Boolean][6]** compression predictor options: none, horizontal, float (optional, default `'horizontal'`)
+    *   `options.compression` **[string][2]** compression options: none, jpeg, deflate, packbits, ccittfax4, lzw, webp, zstd, jp2k (optional, default `'jpeg'`)
-    -   `options.xres` **[Number][8]** horizontal resolution in pixels/mm (optional, default `1.0`)
+    *   `options.predictor` **[string][2]** compression predictor options: none, horizontal, float (optional, default `'horizontal'`)
-    -   `options.yres` **[Number][8]** vertical resolution in pixels/mm (optional, default `1.0`)
+    *   `options.pyramid` **[boolean][10]** write an image pyramid (optional, default `false`)
-    -   `options.squash` **[Boolean][6]** squash 8-bit images down to 1 bit (optional, default `false`)
+    *   `options.tile` **[boolean][10]** write a tiled tiff (optional, default `false`)
+    *   `options.tileWidth` **[number][12]** horizontal tile size (optional, default `256`)
+    *   `options.tileHeight` **[number][12]** vertical tile size (optional, default `256`)
+    *   `options.xres` **[number][12]** horizontal resolution in pixels/mm (optional, default `1.0`)
+    *   `options.yres` **[number][12]** vertical resolution in pixels/mm (optional, default `1.0`)
+    *   `options.resolutionUnit` **[string][2]** resolution unit options: inch, cm (optional, default `'inch'`)
+    *   `options.bitdepth` **[number][12]** reduce bitdepth to 1, 2 or 4 bit (optional, default `8`)
 
 ### Examples
 
@@ -217,70 +453,179 @@ Use these TIFF options for output image.
 sharp('input.svg')
   .tiff({
     compression: 'lzw',
-    squash: true
+    bitdepth: 1
   })
   .toFile('1-bpp-output.tiff')
   .then(info => { ... });
 ```
 
--   Throws **[Error][3]** Invalid options
+*   Throws **[Error][4]** Invalid options
 
-Returns **Sharp** 
+Returns **Sharp**&#x20;
 
-## raw
+## avif
 
-Force output to be raw, uncompressed uint8 pixel data.
+Use these AVIF options for output image.
+
+Whilst it is possible to create AVIF images smaller than 16x16 pixels,
+most web browsers do not display these properly.
+
+AVIF image sequences are not supported.
+
+### Parameters
+
+*   `options` **[Object][6]?** output options
+
+    *   `options.quality` **[number][12]** quality, integer 1-100 (optional, default `50`)
+    *   `options.lossless` **[boolean][10]** use lossless compression (optional, default `false`)
+    *   `options.effort` **[number][12]** CPU effort, between 0 (fastest) and 9 (slowest) (optional, default `4`)
+    *   `options.chromaSubsampling` **[string][2]** set to '4:2:0' to use chroma subsampling (optional, default `'4:4:4'`)
 
 ### Examples
 
 ```javascript
-// Extract raw RGB pixel data from JPEG input
+const data = await sharp(input)
+  .avif({ effort: 2 })
+  .toBuffer();
+```
+
+```javascript
+const data = await sharp(input)
+  .avif({ lossless: true })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.27.0
+
+## heif
+
+Use these HEIF options for output image.
+
+Support for patent-encumbered HEIC images using `hevc` compression requires the use of a
+globally-installed libvips compiled with support for libheif, libde265 and x265.
+
+### Parameters
+
+*   `options` **[Object][6]?** output options
+
+    *   `options.quality` **[number][12]** quality, integer 1-100 (optional, default `50`)
+    *   `options.compression` **[string][2]** compression format: av1, hevc (optional, default `'av1'`)
+    *   `options.lossless` **[boolean][10]** use lossless compression (optional, default `false`)
+    *   `options.effort` **[number][12]** CPU effort, between 0 (fastest) and 9 (slowest) (optional, default `4`)
+    *   `options.chromaSubsampling` **[string][2]** set to '4:2:0' to use chroma subsampling (optional, default `'4:4:4'`)
+
+### Examples
+
+```javascript
+const data = await sharp(input)
+  .heif({ compression: 'hevc' })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.23.0
+
+## jxl
+
+Use these JPEG-XL (JXL) options for output image.
+
+This feature is experimental, please do not use in production systems.
+
+Requires libvips compiled with support for libjxl.
+The prebuilt binaries do not include this - see
+[installing a custom libvips][14].
+
+Image metadata (EXIF, XMP) is unsupported.
+
+### Parameters
+
+*   `options` **[Object][6]?** output options
+
+    *   `options.distance` **[number][12]** maximum encoding error, between 0 (highest quality) and 15 (lowest quality) (optional, default `1.0`)
+    *   `options.quality` **[number][12]?** calculate `distance` based on JPEG-like quality, between 1 and 100, overrides distance if specified
+    *   `options.decodingTier` **[number][12]** target decode speed tier, between 0 (highest quality) and 4 (lowest quality) (optional, default `0`)
+    *   `options.lossless` **[boolean][10]** use lossless compression (optional, default `false`)
+    *   `options.effort` **[number][12]** CPU effort, between 3 (fastest) and 9 (slowest) (optional, default `7`)
+
+<!---->
+
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.31.3
+
+## raw
+
+Force output to be raw, uncompressed pixel data.
+Pixel ordering is left-to-right, top-to-bottom, without padding.
+Channel ordering will be RGB or RGBA for non-greyscale colourspaces.
+
+### Parameters
+
+*   `options` **[Object][6]?** output options
+
+    *   `options.depth` **[string][2]** bit depth, one of: char, uchar (default), short, ushort, int, uint, float, complex, double, dpcomplex (optional, default `'uchar'`)
+
+### Examples
+
+```javascript
+// Extract raw, unsigned 8-bit RGB pixel data from JPEG input
 const { data, info } = await sharp('input.jpg')
   .raw()
   .toBuffer({ resolveWithObject: true });
 ```
 
-Returns **Sharp** 
-
-## toFormat
-
-Force output to a given format.
-
-### Parameters
-
--   `format` **([String][1] \| [Object][5])** as a String or an Object with an 'id' attribute
--   `options` **[Object][5]** output options
-
-### Examples
-
 ```javascript
-// Convert any input to PNG output
+// Extract alpha channel as raw, unsigned 16-bit pixel data from PNG input
-const data = await sharp(input)
+const data = await sharp('input.png')
-  .toFormat('png')
+  .ensureAlpha()
+  .extractChannel(3)
+  .toColourspace('b-w')
+  .raw({ depth: 'ushort' })
   .toBuffer();
 ```
 
--   Throws **[Error][3]** unsupported format or options
+*   Throws **[Error][4]** Invalid options
-
-Returns **Sharp** 
 
 ## tile
 
 Use tile-based deep zoom (image pyramid) output.
+
 Set the format and options for tile images via the `toFormat`, `jpeg`, `png` or `webp` functions.
 Use a `.zip` or `.szi` file extension with `toFile` to write to a compressed archive file format.
 
-Warning: multiple sharp instances concurrently producing tile output can expose a possible race condition in some versions of libgsf.
+The container will be set to `zip` when the output is a Buffer or Stream, otherwise it will default to `fs`.
 
 ### Parameters
 
--   `tile` **[Object][5]?** 
+*   `options` **[Object][6]?**&#x20;
-    -   `tile.size` **[Number][8]** tile size in pixels, a value between 1 and 8192. (optional, default `256`)
+
-    -   `tile.overlap` **[Number][8]** tile overlap in pixels, a value between 0 and 8192. (optional, default `0`)
+    *   `options.size` **[number][12]** tile size in pixels, a value between 1 and 8192. (optional, default `256`)
-    -   `tile.angle` **[Number][8]** tile angle of rotation, must be a multiple of 90. (optional, default `0`)
+    *   `options.overlap` **[number][12]** tile overlap in pixels, a value between 0 and 8192. (optional, default `0`)
-    -   `tile.depth` **[String][1]?** how deep to make the pyramid, possible values are `onepixel`, `onetile` or `one`, default based on layout.
+    *   `options.angle` **[number][12]** tile angle of rotation, must be a multiple of 90. (optional, default `0`)
-    -   `tile.container` **[String][1]** tile container, with value `fs` (filesystem) or `zip` (compressed file). (optional, default `'fs'`)
+    *   `options.background` **([string][2] | [Object][6])** background colour, parsed by the [color][15] module, defaults to white without transparency. (optional, default `{r:255,g:255,b:255,alpha:1}`)
-    -   `tile.layout` **[String][1]** filesystem layout, possible values are `dz`, `zoomify` or `google`. (optional, default `'dz'`)
+    *   `options.depth` **[string][2]?** how deep to make the pyramid, possible values are `onepixel`, `onetile` or `one`, default based on layout.
+    *   `options.skipBlanks` **[number][12]** threshold to skip tile generation, a value 0 - 255 for 8-bit images or 0 - 65535 for 16-bit images (optional, default `-1`)
+    *   `options.container` **[string][2]** tile container, with value `fs` (filesystem) or `zip` (compressed file). (optional, default `'fs'`)
+    *   `options.layout` **[string][2]** filesystem layout, possible values are `dz`, `iiif`, `iiif3`, `zoomify` or `google`. (optional, default `'dz'`)
+    *   `options.centre` **[boolean][10]** centre image in tile. (optional, default `false`)
+    *   `options.center` **[boolean][10]** alternative spelling of centre. (optional, default `false`)
+    *   `options.id` **[string][2]** when `layout` is `iiif`/`iiif3`, sets the `@id`/`id` attribute of `info.json` (optional, default `'https://example.com/iiif'`)
+    *   `options.basename` **[string][2]?** the name of the directory within the zip file when container is `zip`.
 
 ### Examples
 
@@ -296,22 +641,83 @@ sharp('input.tiff')
   });
 ```
 
--   Throws **[Error][3]** Invalid parameters
+```javascript
+const zipFileWithTiles = await sharp(input)
+  .tile({ basename: "tiles" })
+  .toBuffer();
+```
 
-Returns **Sharp** 
+```javascript
+const iiififier = sharp().tile({ layout: "iiif" });
+readableStream
+  .pipe(iiififier)
+  .pipe(writeableStream);
+```
 
-[1]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+*   Throws **[Error][4]** Invalid parameters
 
-[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
+Returns **Sharp**&#x20;
 
-[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+## timeout
 
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
+Set a timeout for processing, in seconds.
+Use a value of zero to continue processing indefinitely, the default behaviour.
 
-[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+The clock starts when libvips opens an input image for processing.
+Time spent waiting for a libuv thread to become available is not included.
 
-[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+### Parameters
 
-[7]: https://nodejs.org/api/buffer.html
+*   `options` **[Object][6]**&#x20;
 
-[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+    *   `options.seconds` **[number][12]** Number of seconds after which processing will be stopped
+
+### Examples
+
+```javascript
+// Ensure processing takes no longer than 3 seconds
+try {
+  const data = await sharp(input)
+    .blur(1000)
+    .timeout({ seconds: 3 })
+    .toBuffer();
+} catch (err) {
+  if (err.message.includes('timeout')) { ... }
+}
+```
+
+Returns **Sharp**&#x20;
+
+**Meta**
+
+*   **since**: 0.29.2
+
+[1]: #withmetadata
+
+[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
+
+[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
+
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[7]: #toformat
+
+[8]: #jpeg
+
+[9]: #png
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[11]: https://nodejs.org/api/buffer.html
+
+[12]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[13]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
+
+[14]: https://sharp.pixelplumbing.com/install#custom-libvips
+
+[15]: https://www.npmjs.org/package/color

docs/api-resize.md

@@ -2,181 +2,327 @@
 
 ## resize
 
-Resize image to `width` x `height`.
+Resize image to `width`, `height` or `width x height`.
-By default, the resized image is centre cropped to the exact size specified.
 
-Possible kernels are:
+When both a `width` and `height` are provided, the possible methods by which the image should **fit** these are:
 
--   `nearest`: Use [nearest neighbour interpolation][1].
+*   `cover`: (default) Preserving aspect ratio, ensure the image covers both provided dimensions by cropping/clipping to fit.
--   `cubic`: Use a [Catmull-Rom spline][2].
+*   `contain`: Preserving aspect ratio, contain within both provided dimensions using "letterboxing" where necessary.
--   `lanczos2`: Use a [Lanczos kernel][3] with `a=2`.
+*   `fill`: Ignore the aspect ratio of the input and stretch to both provided dimensions.
--   `lanczos3`: Use a Lanczos kernel with `a=3` (the default).
+*   `inside`: Preserving aspect ratio, resize the image to be as large as possible while ensuring its dimensions are less than or equal to both those specified.
+*   `outside`: Preserving aspect ratio, resize the image to be as small as possible while ensuring its dimensions are greater than or equal to both those specified.
 
-### Parameters
+Some of these values are based on the [object-fit][1] CSS property.
 
--   `width` **[Number][4]?** pixels wide the resultant image should be. Use `null` or `undefined` to auto-scale the width to match the height.
+<img alt="Examples of various values for the fit property when resizing" width="100%" style="aspect-ratio: 998/243" src="https://cdn.jsdelivr.net/gh/lovell/sharp@main/docs/image/api-resize-fit.png">
--   `height` **[Number][4]?** pixels high the resultant image should be. Use `null` or `undefined` to auto-scale the height to match the width.
--   `options` **[Object][5]?** 
-    -   `options.kernel` **[String][6]** the kernel to use for image reduction. (optional, default `'lanczos3'`)
-    -   `options.fastShrinkOnLoad` **[Boolean][7]** take greater advantage of the JPEG and WebP shrink-on-load feature, which can lead to a slight moiré pattern on some images. (optional, default `true`)
 
-### Examples
+When using a **fit** of `cover` or `contain`, the default **position** is `centre`. Other options are:
 
-```javascript
+*   `sharp.position`: `top`, `right top`, `right`, `right bottom`, `bottom`, `left bottom`, `left`, `left top`.
-sharp(inputBuffer)
+*   `sharp.gravity`: `north`, `northeast`, `east`, `southeast`, `south`, `southwest`, `west`, `northwest`, `center` or `centre`.
-  .resize(200, 300, {
+*   `sharp.strategy`: `cover` only, dynamically crop using either the `entropy` or `attention` strategy.
-    kernel: sharp.kernel.nearest
-  })
-  .background('white')
-  .embed()
-  .toFile('output.tiff')
-  .then(function() {
-    // output.tiff is a 200 pixels wide and 300 pixels high image
-    // containing a nearest-neighbour scaled version, embedded on a white canvas,
-    // of the image data in inputBuffer
-  });
-```
 
--   Throws **[Error][8]** Invalid parameters
+Some of these values are based on the [object-position][2] CSS property.
-
-Returns **Sharp** 
-
-## crop
-
-Crop the resized image to the exact size specified, the default behaviour.
-
-Possible attributes of the optional `sharp.gravity` are `north`, `northeast`, `east`, `southeast`, `south`,
-`southwest`, `west`, `northwest`, `center` and `centre`.
 
 The experimental strategy-based approach resizes so one dimension is at its target length
 then repeatedly ranks edge regions, discarding the edge with the lowest score based on the selected strategy.
 
--   `entropy`: focus on the region with the highest [Shannon entropy][9].
+*   `entropy`: focus on the region with the highest [Shannon entropy][3].
--   `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
+*   `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
+
+Possible interpolation kernels are:
+
+*   `nearest`: Use [nearest neighbour interpolation][4].
+*   `cubic`: Use a [Catmull-Rom spline][5].
+*   `mitchell`: Use a [Mitchell-Netravali spline][6].
+*   `lanczos2`: Use a [Lanczos kernel][7] with `a=2`.
+*   `lanczos3`: Use a Lanczos kernel with `a=3` (the default).
+
+Only one resize can occur per pipeline.
+Previous calls to `resize` in the same pipeline will be ignored.
 
 ### Parameters
 
--   `crop` **[String][6]** A member of `sharp.gravity` to crop to an edge/corner or `sharp.strategy` to crop dynamically. (optional, default `'centre'`)
+*   `width` **[number][8]?** pixels wide the resultant image should be. Use `null` or `undefined` to auto-scale the width to match the height.
+*   `height` **[number][8]?** pixels high the resultant image should be. Use `null` or `undefined` to auto-scale the height to match the width.
+*   `options` **[Object][9]?**&#x20;
+
+    *   `options.width` **[String][10]?** alternative means of specifying `width`. If both are present this takes priority.
+    *   `options.height` **[String][10]?** alternative means of specifying `height`. If both are present this takes priority.
+    *   `options.fit` **[String][10]** how the image should be resized to fit both provided dimensions, one of `cover`, `contain`, `fill`, `inside` or `outside`. (optional, default `'cover'`)
+    *   `options.position` **[String][10]** position, gravity or strategy to use when `fit` is `cover` or `contain`. (optional, default `'centre'`)
+    *   `options.background` **([String][10] | [Object][9])** background colour when `fit` is `contain`, parsed by the [color][11] module, defaults to black without transparency. (optional, default `{r:0,g:0,b:0,alpha:1}`)
+    *   `options.kernel` **[String][10]** the kernel to use for image reduction. (optional, default `'lanczos3'`)
+    *   `options.withoutEnlargement` **[Boolean][12]** do not enlarge if the width *or* height are already less than the specified dimensions, equivalent to GraphicsMagick's `>` geometry option. (optional, default `false`)
+    *   `options.withoutReduction` **[Boolean][12]** do not reduce if the width *or* height are already greater than the specified dimensions, equivalent to GraphicsMagick's `<` geometry option. (optional, default `false`)
+    *   `options.fastShrinkOnLoad` **[Boolean][12]** take greater advantage of the JPEG and WebP shrink-on-load feature, which can lead to a slight moiré pattern on some images. (optional, default `true`)
 
 ### Examples
 
+```javascript
+sharp(input)
+  .resize({ width: 100 })
+  .toBuffer()
+  .then(data => {
+    // 100 pixels wide, auto-scaled height
+  });
+```
+
+```javascript
+sharp(input)
+  .resize({ height: 100 })
+  .toBuffer()
+  .then(data => {
+    // 100 pixels high, auto-scaled width
+  });
+```
+
+```javascript
+sharp(input)
+  .resize(200, 300, {
+    kernel: sharp.kernel.nearest,
+    fit: 'contain',
+    position: 'right top',
+    background: { r: 255, g: 255, b: 255, alpha: 0.5 }
+  })
+  .toFile('output.png')
+  .then(() => {
+    // output.png is a 200 pixels wide and 300 pixels high image
+    // containing a nearest-neighbour scaled version
+    // contained within the north-east corner of a semi-transparent white canvas
+  });
+```
+
 ```javascript
 const transformer = sharp()
-  .resize(200, 200)
+  .resize({
-  .crop(sharp.strategy.entropy)
+    width: 200,
-  .on('error', function(err) {
+    height: 200,
-    console.log(err);
+    fit: sharp.fit.cover,
+    position: sharp.strategy.entropy
   });
 // Read image data from readableStream
 // Write 200px square auto-cropped image data to writableStream
-readableStream.pipe(transformer).pipe(writableStream);
+readableStream
+  .pipe(transformer)
+  .pipe(writableStream);
 ```
 
--   Throws **[Error][8]** Invalid parameters
-
-Returns **Sharp** 
-
-## embed
-
-Preserving aspect ratio, resize the image to the maximum `width` or `height` specified
-then embed on a background of the exact `width` and `height` specified.
-
-If the background contains an alpha value then WebP and PNG format output images will
-contain an alpha channel, even when the input image does not.
-
-### Parameters
-
--   `embed` **[String][6]** A member of `sharp.gravity` to embed to an edge/corner. (optional, default `'centre'`)
-
-### Examples
-
 ```javascript
-sharp('input.gif')
+sharp(input)
-  .resize(200, 300)
+  .resize(200, 200, {
-  .background({r: 0, g: 0, b: 0, alpha: 0})
+    fit: sharp.fit.inside,
-  .embed()
+    withoutEnlargement: true
-  .toFormat(sharp.format.webp)
+  })
-  .toBuffer(function(err, outputBuffer) {
-    if (err) {
-      throw err;
-    }
-    // outputBuffer contains WebP image data of a 200 pixels wide and 300 pixels high
-    // containing a scaled version, embedded on a transparent canvas, of input.gif
-  });
-```
-
--   Throws **[Error][8]** Invalid parameters
-
-Returns **Sharp** 
-
-## max
-
-Preserving aspect ratio, resize the image to be as large as possible
-while ensuring its dimensions are less than or equal to the `width` and `height` specified.
-
-Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
-
-### Examples
-
-```javascript
-sharp(inputBuffer)
-  .resize(200, 200)
-  .max()
   .toFormat('jpeg')
   .toBuffer()
   .then(function(outputBuffer) {
-    // outputBuffer contains JPEG image data no wider than 200 pixels and no higher
+    // outputBuffer contains JPEG image data
-    // than 200 pixels regardless of the inputBuffer image dimensions
+    // no wider and no higher than 200 pixels
+    // and no larger than the input image
   });
 ```
 
-Returns **Sharp** 
+```javascript
+sharp(input)
+  .resize(200, 200, {
+    fit: sharp.fit.outside,
+    withoutReduction: true
+  })
+  .toFormat('jpeg')
+  .toBuffer()
+  .then(function(outputBuffer) {
+    // outputBuffer contains JPEG image data
+    // of at least 200 pixels wide and 200 pixels high while maintaining aspect ratio
+    // and no smaller than the input image
+  });
+```
 
-## min
+```javascript
+const scaleByHalf = await sharp(input)
+  .metadata()
+  .then(({ width }) => sharp(input)
+    .resize(Math.round(width * 0.5))
+    .toBuffer()
+  );
+```
 
-Preserving aspect ratio, resize the image to be as small as possible
+*   Throws **[Error][13]** Invalid parameters
-while ensuring its dimensions are greater than or equal to the `width` and `height` specified.
 
-Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
+Returns **Sharp**&#x20;
 
-Returns **Sharp** 
+## extend
 
-## ignoreAspectRatio
+Extends/pads the edges of the image with the provided background colour.
-
+This operation will always occur after resizing and extraction, if any.
-Ignoring the aspect ratio of the input, stretch the image to
-the exact `width` and/or `height` provided via `resize`.
-
-Returns **Sharp** 
-
-## withoutEnlargement
-
-Do not enlarge the output image if the input image width _or_ height are already less than the required dimensions.
-This is equivalent to GraphicsMagick's `>` geometry option:
-"_change the dimensions of the image only if its width or height exceeds the geometry specification_".
-Use with `max()` to preserve the image's aspect ratio.
-
-The default behaviour _before_ function call is `false`, meaning the image will be enlarged.
 
 ### Parameters
 
--   `withoutEnlargement` **[Boolean][7]**  (optional, default `true`)
+*   `extend` **([number][8] | [Object][9])** single pixel count to add to all edges or an Object with per-edge counts
 
-Returns **Sharp** 
+    *   `extend.top` **[number][8]**  (optional, default `0`)
+    *   `extend.left` **[number][8]**  (optional, default `0`)
+    *   `extend.bottom` **[number][8]**  (optional, default `0`)
+    *   `extend.right` **[number][8]**  (optional, default `0`)
+    *   `extend.background` **([String][10] | [Object][9])** background colour, parsed by the [color][11] module, defaults to black without transparency. (optional, default `{r:0,g:0,b:0,alpha:1}`)
 
-[1]: http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation
+### Examples
 
-[2]: https://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline
+```javascript
+// Resize to 140 pixels wide, then add 10 transparent pixels
+// to the top, left and right edges and 20 to the bottom edge
+sharp(input)
+  .resize(140)
+  .extend({
+    top: 10,
+    bottom: 20,
+    left: 10,
+    right: 10,
+    background: { r: 0, g: 0, b: 0, alpha: 0 }
+  })
+  ...
+```
 
-[3]: https://en.wikipedia.org/wiki/Lanczos_resampling#Lanczos_kernel
+```javascript
+// Add a row of 10 red pixels to the bottom
+sharp(input)
+  .extend({
+    bottom: 10,
+    background: 'red'
+  })
+  ...
+```
 
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+*   Throws **[Error][13]** Invalid parameters
 
-[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+Returns **Sharp**&#x20;
 
-[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+## extract
 
-[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+Extract/crop a region of the image.
 
-[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+*   Use `extract` before `resize` for pre-resize extraction.
+*   Use `extract` after `resize` for post-resize extraction.
+*   Use `extract` before and after for both.
 
-[9]: https://en.wikipedia.org/wiki/Entropy_%28information_theory%29
+### Parameters
+
+*   `options` **[Object][9]** describes the region to extract using integral pixel values
+
+    *   `options.left` **[number][8]** zero-indexed offset from left edge
+    *   `options.top` **[number][8]** zero-indexed offset from top edge
+    *   `options.width` **[number][8]** width of region to extract
+    *   `options.height` **[number][8]** height of region to extract
+
+### Examples
+
+```javascript
+sharp(input)
+  .extract({ left: left, top: top, width: width, height: height })
+  .toFile(output, function(err) {
+    // Extract a region of the input image, saving in the same format.
+  });
+```
+
+```javascript
+sharp(input)
+  .extract({ left: leftOffsetPre, top: topOffsetPre, width: widthPre, height: heightPre })
+  .resize(width, height)
+  .extract({ left: leftOffsetPost, top: topOffsetPost, width: widthPost, height: heightPost })
+  .toFile(output, function(err) {
+    // Extract a region, resize, then extract from the resized image
+  });
+```
+
+*   Throws **[Error][13]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+## trim
+
+Trim pixels from all edges that contain values similar to the given background colour, which defaults to that of the top-left pixel.
+
+Images with an alpha channel will use the combined bounding box of alpha and non-alpha channels.
+
+If the result of this operation would trim an image to nothing then no change is made.
+
+The `info` response Object, obtained from callback of `.toFile()` or `.toBuffer()`,
+will contain `trimOffsetLeft` and `trimOffsetTop` properties.
+
+### Parameters
+
+*   `trim` **([string][10] | [number][8] | [Object][9])** the specific background colour to trim, the threshold for doing so or an Object with both.
+
+    *   `trim.background` **([string][10] | [Object][9])** background colour, parsed by the [color][11] module, defaults to that of the top-left pixel. (optional, default `'top-left pixel'`)
+    *   `trim.threshold` **[number][8]** the allowed difference from the above colour, a positive number. (optional, default `10`)
+
+### Examples
+
+```javascript
+// Trim pixels with a colour similar to that of the top-left pixel.
+sharp(input)
+  .trim()
+  .toFile(output, function(err, info) {
+    ...
+  });
+```
+
+```javascript
+// Trim pixels with the exact same colour as that of the top-left pixel.
+sharp(input)
+  .trim(0)
+  .toFile(output, function(err, info) {
+    ...
+  });
+```
+
+```javascript
+// Trim only pixels with a similar colour to red.
+sharp(input)
+  .trim("#FF0000")
+  .toFile(output, function(err, info) {
+    ...
+  });
+```
+
+```javascript
+// Trim all "yellow-ish" pixels, being more lenient with the higher threshold.
+sharp(input)
+  .trim({
+    background: "yellow",
+    threshold: 42,
+  })
+  .toFile(output, function(err, info) {
+    ...
+  });
+```
+
+*   Throws **[Error][13]** Invalid parameters
+
+Returns **Sharp**&#x20;
+
+[1]: https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit
+
+[2]: https://developer.mozilla.org/en-US/docs/Web/CSS/object-position
+
+[3]: https://en.wikipedia.org/wiki/Entropy_%28information_theory%29
+
+[4]: http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation
+
+[5]: https://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline
+
+[6]: https://www.cs.utexas.edu/~fussell/courses/cs384g-fall2013/lectures/mitchell/Mitchell.pdf
+
+[7]: https://en.wikipedia.org/wiki/Lanczos_resampling#Lanczos_kernel
+
+[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[9]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[11]: https://www.npmjs.org/package/color
+
+[12]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[13]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error

docs/api-utility.md

@@ -1,18 +1,82 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->
 
+## format
+
+An Object containing nested boolean values representing the available input and output formats/methods.
+
+### Examples
+
+```javascript
+console.log(sharp.format);
+```
+
+Returns **[Object][1]**&#x20;
+
+## interpolators
+
+An Object containing the available interpolators and their proper values
+
+Type: [string][2]
+
+### nearest
+
+[Nearest neighbour interpolation][3]. Suitable for image enlargement only.
+
+### bilinear
+
+[Bilinear interpolation][4]. Faster than bicubic but with less smooth results.
+
+### bicubic
+
+[Bicubic interpolation][5] (the default).
+
+### locallyBoundedBicubic
+
+[LBB interpolation][6]. Prevents some "[acutance][7]" but typically reduces performance by a factor of 2.
+
+### nohalo
+
+[Nohalo interpolation][8]. Prevents acutance but typically reduces performance by a factor of 3.
+
+### vertexSplitQuadraticBasisSpline
+
+[VSQBS interpolation][9]. Prevents "staircasing" when enlarging.
+
+## versions
+
+An Object containing the version numbers of libvips and its dependencies.
+
+### Examples
+
+```javascript
+console.log(sharp.versions);
+```
+
+## vendor
+
+An Object containing the platform and architecture
+of the current and installed vendored binaries.
+
+### Examples
+
+```javascript
+console.log(sharp.vendor);
+```
+
 ## cache
 
-Gets or, when options are provided, sets the limits of _libvips'_ operation cache.
+Gets or, when options are provided, sets the limits of *libvips'* operation cache.
 Existing entries in the cache will be trimmed after any change in limits.
 This method always returns cache statistics,
 useful for determining how much working memory is required for a particular task.
 
 ### Parameters
 
--   `options` **([Object][1] \| [Boolean][2])** Object with the following attributes, or Boolean where true uses default cache settings and false removes all caching (optional, default `true`)
+*   `options` **([Object][1] | [boolean][10])** Object with the following attributes, or boolean where true uses default cache settings and false removes all caching (optional, default `true`)
-    -   `options.memory` **[Number][3]** is the maximum memory in MB to use for this cache (optional, default `50`)
+
-    -   `options.files` **[Number][3]** is the maximum number of files to hold open (optional, default `20`)
+    *   `options.memory` **[number][11]** is the maximum memory in MB to use for this cache (optional, default `50`)
-    -   `options.items` **[Number][3]** is the maximum number of operations to cache (optional, default `100`)
+    *   `options.files` **[number][11]** is the maximum number of files to hold open (optional, default `20`)
+    *   `options.items` **[number][11]** is the maximum number of operations to cache (optional, default `100`)
 
 ### Examples
 
@@ -26,23 +90,40 @@ sharp.cache( { files: 0 } );
 sharp.cache(false);
 ```
 
-Returns **[Object][1]** 
+Returns **[Object][1]**&#x20;
 
 ## concurrency
 
 Gets or, when a concurrency is provided, sets
-the number of threads _libvips'_ should create to process each image.
+the maximum number of threads *libvips* should use to process *each image*.
-The default value is the number of CPU cores.
+These are from a thread pool managed by glib,
-A value of `0` will reset to this default.
+which helps avoid the overhead of creating new threads.
-
-The maximum number of images that can be processed in parallel
-is limited by libuv's `UV_THREADPOOL_SIZE` environment variable.
 
 This method always returns the current concurrency.
 
+The default value is the number of CPU cores,
+except when using glibc-based Linux without jemalloc,
+where the default is `1` to help reduce memory fragmentation.
+
+A value of `0` will reset this to the number of CPU cores.
+
+Some image format libraries spawn additional threads,
+e.g. libaom manages its own 4 threads when encoding AVIF images,
+and these are independent of the value set here.
+
+The maximum number of images that sharp can process in parallel
+is controlled by libuv's `UV_THREADPOOL_SIZE` environment variable,
+which defaults to 4.
+
+[https://nodejs.org/api/cli.html#uv\_threadpool\_sizesize][12]
+
+For example, by default, a machine with 8 CPU cores will process
+4 images in parallel and use up to 8 threads per image,
+so there will be up to 32 concurrent threads.
+
 ### Parameters
 
--   `concurrency` **[Number][3]?** 
+*   `concurrency` **[number][11]?**&#x20;
 
 ### Examples
 
@@ -52,14 +133,29 @@ sharp.concurrency(2); // 2
 sharp.concurrency(0); // 4
 ```
 
-Returns **[Number][3]** concurrency
+Returns **[number][11]** concurrency
+
+## queue
+
+An EventEmitter that emits a `change` event when a task is either:
+
+*   queued, waiting for *libuv* to provide a worker thread
+*   complete
+
+### Examples
+
+```javascript
+sharp.queue.on('change', function(queueLength) {
+  console.log('Queue contains ' + queueLength + ' task(s)');
+});
+```
 
 ## counters
 
 Provides access to internal task counters.
 
--   queue is the number of tasks this module has queued waiting for _libuv_ to provide a worker thread from its pool.
+*   queue is the number of tasks this module has queued waiting for *libuv* to provide a worker thread from its pool.
--   process is the number of resize tasks currently being processed.
+*   process is the number of resize tasks currently being processed.
 
 ### Examples
 
@@ -67,7 +163,7 @@ Provides access to internal task counters.
 const counters = sharp.counters(); // { queue: 2, process: 4 }
 ```
 
-Returns **[Object][1]** 
+Returns **[Object][1]**&#x20;
 
 ## simd
 
@@ -77,29 +173,44 @@ Requires libvips to have been compiled with liborc support.
 Improves the performance of `resize`, `blur` and `sharpen` operations
 by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM NEON.
 
-This feature is currently off by default but future versions may reverse this.
-Versions of liborc prior to 0.4.25 are known to segfault under heavy load.
-
 ### Parameters
 
--   `simd` **[Boolean][2]**  (optional, default `false`)
+*   `simd` **[boolean][10]**  (optional, default `true`)
 
 ### Examples
 
 ```javascript
 const simd = sharp.simd();
-// simd is `true` if SIMD is currently enabled
+// simd is `true` if the runtime use of liborc is currently enabled
 ```
 
 ```javascript
-const simd = sharp.simd(true);
+const simd = sharp.simd(false);
-// attempts to enable the use of SIMD, returning true if available
+// prevent libvips from using liborc at runtime
 ```
 
-Returns **[Boolean][2]** 
+Returns **[boolean][10]**&#x20;
 
 [1]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
 
-[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
 
-[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+[3]: http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation
+
+[4]: http://en.wikipedia.org/wiki/Bilinear_interpolation
+
+[5]: http://en.wikipedia.org/wiki/Bicubic_interpolation
+
+[6]: https://github.com/libvips/libvips/blob/master/libvips/resample/lbb.cpp#L100
+
+[7]: http://en.wikipedia.org/wiki/Acutance
+
+[8]: http://eprints.soton.ac.uk/268086/
+
+[9]: https://github.com/libvips/libvips/blob/master/libvips/resample/vsqbs.cpp#L48
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[12]: https://nodejs.org/api/cli.html#uv_threadpool_sizesize

docs/build.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const fs = require('fs').promises;
+const path = require('path');
+
+[
+  'constructor',
+  'input',
+  'resize',
+  'composite',
+  'operation',
+  'colour',
+  'channel',
+  'output',
+  'utility'
+].forEach(async (m) => {
+  const documentation = await import('documentation');
+
+  const input = path.join('lib', `${m}.js`);
+  const output = path.join('docs', `api-${m}.md`);
+
+  const ast = await documentation.build(input, { shallow: true });
+  const markdown = await documentation.formats.md(ast, { markdownToc: false });
+
+  await fs.writeFile(output, markdown);
+});

docs/css/extra.css

@@ -1,5 +0,0 @@
-/* Nest document subheadings in navigation */
-ul.subnav ul:not(.subnav) {
-  padding-left: 2em;
-  font-size: 80%;
-}

docs/firebase.json

@@ -0,0 +1,116 @@
+{
+  "hosting": {
+    "site": "pixelplumbing-sharp",
+    "public": ".",
+    "ignore": [
+      ".*",
+      "build.js",
+      "firebase.json",
+      "image/**",
+      "search-index/**"
+    ],
+    "headers": [
+      {
+        "source": "**",
+        "headers": [
+          { "key": "Cache-Control", "value": "max-age=86400" },
+          { "key": "X-Content-Type-Options", "value": "nosniff" },
+          { "key": "X-Frame-Options", "value": "SAMEORIGIN" }
+        ]
+      }
+    ],
+    "redirects": [
+      {
+        "source": "**/install/**",
+        "destination": "/install",
+        "type": 301
+      },
+      {
+        "source": "/page/install",
+        "destination": "/install",
+        "type": 301
+      },
+      {
+        "source": "**/api-constructor/**",
+        "destination": "/api-constructor",
+        "type": 301
+      },
+      {
+        "source": "**/api-input/**",
+        "destination": "/api-input",
+        "type": 301
+      },
+      {
+        "source": "**/api-output/**",
+        "destination": "/api-output",
+        "type": 301
+      },
+      {
+        "source": "**/api-resize/**",
+        "destination": "/api-resize",
+        "type": 301
+      },
+      {
+        "source": "**/api-compsite/**",
+        "destination": "/api-compsite",
+        "type": 301
+      },
+      {
+        "source": "**/api-operation/**",
+        "destination": "/api-operation",
+        "type": 301
+      },
+      {
+        "source": "**/api-colour/**",
+        "destination": "/api-colour",
+        "type": 301
+      },
+      {
+        "source": "**/api-channel/**",
+        "destination": "/api-channel",
+        "type": 301
+      },
+      {
+        "source": "**/api-utility/**",
+        "destination": "/api-utility",
+        "type": 301
+      },
+      {
+        "source": "/page/api",
+        "destination": "/api-constructor",
+        "type": 301
+      },
+      {
+        "source": "**/performance/**",
+        "destination": "/performance",
+        "type": 301
+      },
+      {
+        "source": "/page/performance",
+        "destination": "/performance",
+        "type": 301
+      },
+      {
+        "source": "**/changelog/**",
+        "destination": "/changelog",
+        "type": 301
+      },
+      {
+        "source": "/page/changelog",
+        "destination": "/changelog",
+        "type": 301
+      },
+      {
+        "source": "/en/**",
+        "destination": "/",
+        "type": 301
+      }
+    ],
+    "rewrites": [
+      {
+        "source": "**",
+        "destination": "/index.html"
+      }
+    ]
+  }
+}

docs/humans.txt

@@ -0,0 +1,265 @@
+/* THANKS */
+
+Name: John Cupitt
+GitHub: https://github.com/jcupitt
+
+Name: Pierre Inglebert
+GitHub: https://github.com/pierreinglebert
+
+Name: Jonathan Ong
+GitHub: https://github.com/jonathanong
+
+Name: Chanon Sajjamanochai
+GitHub: https://github.com/chanon
+
+Name: Juliano Julio
+GitHub: https://github.com/julianojulio
+
+Name: Daniel Gasienica
+GitHub: https://github.com/gasi
+
+Name: Julian Walker
+GitHub: https://github.com/julianwa
+
+Name: Amit Pitaru
+GitHub: https://github.com/apitaru
+
+Name: Brandon Aaron
+GitHub: https://github.com/brandonaaron
+
+Name: Andreas Lind
+GitHub: https://github.com/papandreouGitHub:
+
+Name: Maurus Cuelenaere
+GitHub: https://github.com/mcuelenaere
+
+Name: Linus Unnebäck
+GitHub: https://github.com/LinusU
+
+Name: Victor Mateevitsi
+GitHub: https://github.com/mvictoras
+
+Name: Alaric Holloway
+GitHub: https://github.com/skedastik
+
+Name: Bernhard K. Weisshuhn
+GitHub: https://github.com/bkw
+
+Name: David A. Carley
+GitHub: https://github.com/dacarley
+
+Name: John Tobin
+GitHub: https://github.com/jtobinisaniceguy
+
+Name: Kenton Gray
+GitHub: https://github.com/kentongray
+
+Name: Felix Bünemann
+GitHub: https://github.com/felixbuenemann
+
+Name: Samy Al Zahrani
+GitHub: https://github.com/salzhrani
+
+Name: Chintan Thakkar
+GitHub: https://github.com/lemnisk8
+
+Name: F. Orlando Galashan
+GitHub: https://github.com/frulo
+
+Name: Kleis Auke Wolthuizen
+GitHub: https://github.com/kleisauke
+
+Name: Matt Hirsch
+GitHub: https://github.com/mhirsch
+
+Name: Rahul Nanwani
+GitHub: https://github.com/rnanwani
+
+Name: Matthias Thoemmes
+GitHub: https://github.com/cmtt
+
+Name: Patrick Paskaris
+GitHub: https://github.com/ppaskaris
+
+Name: Jérémy Lal
+GitHub: https://github.com/kapouer
+
+Name: Alice Monday
+GitHub: https://github.com/alice0meta
+
+Name: Kristo Jorgenson
+GitHub: https://github.com/kristojorg
+
+Name: Yves Bos
+GitHub: https://github.com/YvesBos
+
+Name: Nicolas Coden
+GitHub: https://github.com/ncoden
+
+Name: Matt Parrish
+GitHub: https://github.com/pbomb
+
+Name: Matthew McEachen
+GitHub: https://github.com/mceachen
+
+Name: Jarda Kotěšovec
+GitHub: https://github.com/jardakotesovec
+
+Name: Kenric D'Souza
+GitHub: https://github.com/AzureByte
+
+Name: Oleh Aleinyk
+GitHub: https://github.com/oaleynik
+
+Name: Marcel Bretschneider
+GitHub: https://github.com/3epnm
+
+Name: Andrea Bianco
+GitHub: https://github.com/BiancoA
+
+Name: Rik Heywood
+GitHub: https://github.com/rikh42
+
+Name: Thomas Parisot
+GitHub: https://github.com/oncletom
+
+Name: Nathan Graves
+GitHub: https://github.com/woolite64
+
+Name: Tom Lokhorst
+GitHub: https://github.com/tomlokhorst
+
+Name: Espen Hovlandsdal
+GitHub: https://github.com/rexxars
+
+Name: Sylvain Dumont
+GitHub: https://github.com/sylvaindumont
+
+Name: Alun Davies
+GitHub: https://github.com/alundavies
+
+Name: Aidan Hoolachan
+GitHub: https://github.com/ajhool
+
+Name: Axel Eirola
+GitHub: https://github.com/aeirola
+
+Name: Freezy
+GitHub: https://github.com/freezy
+
+Name: Julian Aubourg
+GitHub: https://github.com/jaubourg
+
+Name: Keith Belovay
+GitHub: https://github.com/fromkeith
+
+Name: Michael B. Klein
+GitHub: https://github.com/mbklein
+
+Name: Jakub Michálek
+GitHub: https://github.com/Goues
+
+Name: Ilya Ovdin
+GitHub: https://github.com/iovdin
+
+Name: Andargor
+GitHub: https://github.com/Andargor
+
+Name: Nicolas Stepien
+GitHub: https://github.com/MayhemYDG
+
+Name: Paul Neave
+GitHub: https://github.com/neave
+
+Name: Brendan Kennedy
+GitHub: https://github.com/rustyguts
+
+Name: Brychan Bennett-Odlum
+GitHub: https://github.com/BrychanOdlum
+
+Name: Edward Silverton
+GitHub: https://github.com/edsilv
+
+Name: Dumitru Deveatii
+GitHub: https://github.com/dimadeveatii
+
+Name: Roland Asmann
+GitHub: https://github.com/malice00
+
+Name: Roman Malieiev
+GitHub: https://github.com/romaleev
+
+Name: Jerome Vouillon
+GitHub: https://github.com/vouillon
+
+Name: Tomáš Szabo
+GitHub: https://github.com/deftomat
+
+Name: Robert O'Rourke
+GitHub: https://github.com/roborourke
+
+Name: Denis Soldatov
+GitHub: https://github.com/derom
+
+Name: Stefan Probst
+GitHub: https://github.com/stefanprobst
+
+Name: Thomas Beiganz
+GitHub: https://github.com/beig
+
+Name: Florian Busch
+GitHub: https://github.com/florian-busch
+
+Name: Matthieu Salettes
+GitHub: https://github.com/msalettes
+
+Name: Taneli Vatanen
+GitHub: https://github.com/Daiz
+
+Name: Mart Jansink
+GitHub: https://github.com/mart-jansink
+
+Name: Tenpi
+GitHub: https://github.com/Tenpi
+
+Name: Zaruike
+GitHub: https://github.com/Zaruike
+
+Name: Erlend F
+GitHub: https://github.com/erf
+
+Name: Drian Naude
+GitHub: https://github.com/driannaude
+
+Name: Max Gordon
+GitHub: https://github.com/gforge
+
+Name: Chris Banks
+GitHub: https://github.com/christopherbradleybanks
+
+Name: codepage949
+GitHub: https://github.com/codepage949
+
+Name: Chris Hranj
+GitHub: https://github.com/Brodan
+
+Name: Ankur Parihar
+GitHub: https://github.com/ankurparihar
+
+Name: Joona Heinikoski
+GitHub: https://github.com/joonamo
+
+Name: AlexanderTheGrey
+GitHub: https://github.com/AlexanderTheGrey
+
+Name: Blayne Chard
+GitHub: https://github.com/blacha
+
+Name: Brahim
+GitHub: https://github.com/brahima
+
+Name: Anton Marsden
+GitHub: https://github.com/antonmarsden
+
+Name:  Marcos Casagrande
+GitHub: https://github.com/marcosc90

docs/image/sharp-logo-mono.svg

@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="86 86 550 550">
+<!-- Creative Commons CC0 1.0 Universal Public Domain Dedication -->
+  <defs>
+    <mask id="c">
+      <path fill="none" stroke="#fff" stroke-width="80" d="M258.411 285.777l200.176-26.8M244.113 466.413L451.44 438.66m.001 0V238.484m0-150.121v171.572l178.725-23.917m-359.843 19.584V477.22m2.387 156.95V462.591L93.984 486.515"/>
+      <path fill="none" stroke="#000" stroke-width="112" d="M451.441 610.246V438.66l178.725-23.91M269.688 112.59v171.58L90.964 308.093"/>
+    </mask>
+  </defs>
+  <path mask="url(#c)" fill="none" stroke="#000" stroke-width="80" d="M258.411 285.777l200.176-26.8M244.113 466.413L451.44 438.66m.001 0V238.484m0-150.121v171.572l178.725-23.917m-359.843 19.584V477.22m2.387 156.95V462.591L93.984 486.515"/>
+  <path fill="none" stroke="#000" stroke-width="80" d="M451.441 610.246V438.66l178.725-23.91M269.688 112.59v171.58L90.964 308.093"/>
+</svg>

docs/image/sharp-logo.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="86 86 550 550">
+<!-- Creative Commons CC0 1.0 Universal Public Domain Dedication -->
+<path fill="none" stroke="#9c0" stroke-width="80" d="M258.411 285.777l200.176-26.8M244.113 466.413L451.44 438.66M451.441 438.66V238.484M451.441 88.363v171.572l178.725-23.917M270.323 255.602V477.22M272.71 634.17V462.591L93.984 486.515"/>
+<path fill="none" stroke="#090" stroke-width="80" d="M451.441 610.246V438.66l178.725-23.91M269.688 112.59v171.58L90.964 308.093"/>
+</svg>

docs/index.md

@@ -1,135 +0,0 @@
-# sharp
-
-The typical use case for this high speed Node.js module
-is to convert large images in common formats to
-smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
-
-Resizing an image is typically 4x-5x faster than using the
-quickest ImageMagick and GraphicsMagick settings.
-
-Colour spaces, embedded ICC profiles and alpha transparency channels are all handled correctly.
-Lanczos resampling ensures quality is not sacrificed for speed.
-
-As well as image resizing, operations such as
-rotation, extraction, compositing and gamma correction are available.
-
-Most 64-bit OS X, Windows and Linux (glibc) systems running
-Node versions 4, 6, 8 and 10
-do not require any additional install or runtime dependencies.
-
-[![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.png?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)
-
-### Formats
-
-This module supports reading JPEG, PNG, WebP, TIFF, GIF and SVG images.
-
-Output images can be in JPEG, PNG, WebP and TIFF formats as well as uncompressed raw pixel data.
-
-Streams, Buffer objects and the filesystem can be used for input and output.
-
-A single input Stream can be split into multiple processing pipelines and output Streams.
-
-Deep Zoom image pyramids can be generated,
-suitable for use with "slippy map" tile viewers like
-[OpenSeadragon](https://github.com/openseadragon/openseadragon)
-and [Leaflet](https://github.com/turban/Leaflet.Zoomify).
-
-### Fast
-
-This module is powered by the blazingly fast
-[libvips](https://github.com/jcupitt/libvips) image processing library,
-originally created in 1989 at Birkbeck College
-and currently maintained by
-[John Cupitt](https://github.com/jcupitt).
-
-Only small regions of uncompressed image data
-are held in memory and processed at a time,
-taking full advantage of multiple CPU cores and L1/L2/L3 cache.
-
-Everything remains non-blocking thanks to _libuv_,
-no child processes are spawned and Promises/async/await are supported.
-
-### Optimal
-
-Huffman tables are optimised when generating JPEG output images
-without having to use separate command line tools like
-[jpegoptim](https://github.com/tjko/jpegoptim) and
-[jpegtran](http://jpegclub.org/jpegtran/).
-
-PNG filtering is disabled by default,
-which for diagrams and line art often produces the same result
-as [pngcrush](https://pmt.sourceforge.io/pngcrush/).
-
-### Contributing
-
-A [guide for contributors](https://github.com/lovell/sharp/blob/master/CONTRIBUTING.md)
-covers reporting bugs, requesting features and submitting code changes.
-
-### Credits
-
-This module would never have been possible without
-the help and code contributions of the following people:
-
-* [John Cupitt](https://github.com/jcupitt)
-* [Pierre Inglebert](https://github.com/pierreinglebert)
-* [Jonathan Ong](https://github.com/jonathanong)
-* [Chanon Sajjamanochai](https://github.com/chanon)
-* [Juliano Julio](https://github.com/julianojulio)
-* [Daniel Gasienica](https://github.com/gasi)
-* [Julian Walker](https://github.com/julianwa)
-* [Amit Pitaru](https://github.com/apitaru)
-* [Brandon Aaron](https://github.com/brandonaaron)
-* [Andreas Lind](https://github.com/papandreou)
-* [Maurus Cuelenaere](https://github.com/mcuelenaere)
-* [Linus Unnebäck](https://github.com/LinusU)
-* [Victor Mateevitsi](https://github.com/mvictoras)
-* [Alaric Holloway](https://github.com/skedastik)
-* [Bernhard K. Weisshuhn](https://github.com/bkw)
-* [David A. Carley](https://github.com/dacarley)
-* [John Tobin](https://github.com/jtobinisaniceguy)
-* [Kenton Gray](https://github.com/kentongray)
-* [Felix Bünemann](https://github.com/felixbuenemann)
-* [Samy Al Zahrani](https://github.com/salzhrani)
-* [Chintan Thakkar](https://github.com/lemnisk8)
-* [F. Orlando Galashan](https://github.com/frulo)
-* [Kleis Auke Wolthuizen](https://github.com/kleisauke)
-* [Matt Hirsch](https://github.com/mhirsch)
-* [Rahul Nanwani](https://github.com/rnanwani)
-* [Matthias Thoemmes](https://github.com/cmtt)
-* [Patrick Paskaris](https://github.com/ppaskaris)
-* [Jérémy Lal](https://github.com/kapouer)
-* [Alice Monday](https://github.com/alice0meta)
-* [Kristo Jorgenson](https://github.com/kristojorg)
-* [Yves Bos](https://github.com/YvesBos)
-* [Nicolas Coden](https://github.com/ncoden)
-* [Matt Parrish](https://github.com/pbomb)
-* [Matthew McEachen](https://github.com/mceachen)
-* [Jarda Kotěšovec](https://github.com/jardakotesovec)
-* [Kenric D'Souza](https://github.com/AzureByte)
-* [Oleh Aleinyk](https://github.com/oaleynik)
-* [Marcel Bretschneider](https://github.com/3epnm)
-* [Andrea Bianco](https://github.com/BiancoA)
-* [Rik Heywood](https://github.com/rikh42)
-* [Thomas Parisot](https://github.com/oncletom)
-* [Nathan Graves](https://github.com/woolite64)
-* [Tom Lokhorst](https://github.com/tomlokhorst)
-* [Espen Hovlandsdal](https://github.com/rexxars)
-* [Sylvain Dumont](https://github.com/sylvaindumont)
-* [Alun Davies](https://github.com/alundavies)
-
-Thank you!
-
-### Licence
-
-Copyright 2013, 2014, 2015, 2016, 2017, 2018 Lovell Fuller and contributors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0.html)
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.

docs/install.md

@@ -10,99 +10,197 @@ yarn add sharp
 
 ## Prerequisites
 
-* Node v4.5.0+
+* Node.js >= 14.15.0
 
-### Building from source
+## Prebuilt binaries
 
-Pre-compiled binaries for sharp are provided for use with
+Ready-compiled sharp and libvips binaries are provided for use on the most common platforms:
-Node versions 4, 6, 8 and 10 on
-64-bit Windows, OS X and Linux platforms.
 
-Sharp will be built from source at install time when:
+* macOS x64 (>= 10.13)
+* macOS ARM64
+* Linux x64 (glibc >= 2.17, musl >= 1.1.24, CPU with SSE4.2)
+* Linux ARM64 (glibc >= 2.17, musl >= 1.1.24)
+* Windows x64
+* Windows x86
 
-* a globally-installed libvips is detected,
+A ~7MB tarball containing libvips and its most commonly used dependencies
-* pre-compiled binaries do not exist for the current platform and Node version, or
+is downloaded via HTTPS, verified via Subresource Integrity
+and decompressed into `node_modules/sharp/vendor` during `npm install`.
+
+This provides support for the
+JPEG, PNG, WebP, AVIF, TIFF, GIF and SVG (input) image formats.
+
+The following platforms have prebuilt libvips but not sharp:
+
+* Linux ARMv7 (glibc >= 2.28)
+* Linux ARMv6 (glibc >= 2.28)
+* Windows ARM64
+
+The following platforms require compilation of both libvips and sharp from source:
+
+* Linux x86
+* Linux ARMv7 (glibc <= 2.27, musl)
+* Linux ARMv6 (glibc <= 2.27, musl)
+* Linux PowerPC
+* FreeBSD
+* OpenBSD
+
+## Common problems
+
+The architecture and platform of Node.js used for `npm install`
+must be the same as the architecture and platform of Node.js used at runtime.
+See the [cross-platform](#cross-platform) section if this is not the case.
+
+When using npm v6 or earlier, the `npm install --unsafe-perm` flag must be used when installing as `root` or a `sudo` user.
+
+When using npm v7 or later, the user running `npm install` must own the directory it is run in.
+
+The `npm install --ignore-scripts=false` flag must be used when `npm` has been configured to ignore installation scripts.
+
+Check the output of running `npm install --verbose --foreground-scripts sharp` for useful error messages.
+
+## Apple M1
+
+Prebuilt sharp and libvips binaries have been provided for macOS on ARM64 since sharp v0.29.0.
+
+## Cross-platform
+
+At `npm install` time, prebuilt binaries are automatically selected for the
+current OS platform and CPU architecture, where available.
+
+The target platform and/or architecture can be manually selected using the following flags.
+
+```sh
+npm install --platform=... --arch=... --arm-version=... sharp
+```
+
+* `--platform`: one of `linux`, `darwin` or `win32`.
+* `--arch`: one of `x64`, `ia32`, `arm` or `arm64`.
+* `--arm-version`: one of `6`, `7` or `8` (`arm` defaults to `6`, `arm64` defaults to `8`).
+* `--libc`: one of `glibc` or `musl`. This option only works with platform `linux`, defaults to `glibc`
+* `--sharp-install-force`: skip version compatibility and Subresource Integrity checks.
+
+These values can also be set via environment variables,
+`npm_config_platform`, `npm_config_arch`, `npm_config_arm_version`, `npm_config_libc`
+and `SHARP_INSTALL_FORCE` respectively.
+
+For example, if the target machine has a 64-bit ARM CPU and is running Alpine Linux,
+use the following flags:
+
+```sh
+npm install --arch=arm64 --platform=linux --libc=musl sharp
+```
+
+If the current machine is Alpine Linux and the target machine is Debian Linux on x64 cpu,
+use the following flags:
+
+```sh
+npm install --arch=x64 --platform=linux --libc=glibc sharp
+```
+
+Multiple platforms and architectures can be supported within the same installation tree.
+The following example for macOS installs x64 binaries then adds (via a rebuild) arm64 binaries:
+
+```sh
+npm install --platform=darwin --arch=x64 sharp
+npm rebuild --platform=darwin --arch=arm64 sharp
+```
+
+## Custom libvips
+
+To use a custom, globally-installed version of libvips instead of the provided binaries,
+make sure it is at least the version listed under `config.libvips` in the `package.json` file
+and that it can be located using `pkg-config --modversion vips-cpp`.
+
+For help compiling libvips and its dependencies, please see
+[building libvips from source](https://www.libvips.org/install.html#building-libvips-from-source).
+
+The use of a globally-installed libvips is unsupported on Windows.
+
+## Building from source
+
+This module will be compiled from source at `npm install` time when:
+
+* a globally-installed libvips is detected (set the `SHARP_IGNORE_GLOBAL_LIBVIPS` environment variable to skip this),
+* prebuilt sharp binaries do not exist for the current platform, or
 * when the `npm install --build-from-source` flag is used.
 
 Building from source requires:
 
-* C++11 compatible compiler such as gcc 4.8+, clang 3.0+ or MSVC 2013+
+* C++11 compiler
-* [node-gyp](https://github.com/TooTallNate/node-gyp#installation) and its dependencies (includes Python)
+* [node-gyp](https://github.com/nodejs/node-gyp#installation) and its dependencies
 
-## libvips
+## Custom prebuilt binaries
 
-### Linux
+This is an advanced approach that most people will not require.
 
-[![Ubuntu 16.04 Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)
+### Prebuilt sharp binaries
 
-libvips and its dependencies are fetched and stored within `node_modules/sharp/vendor` during `npm install`.
+To install the prebuilt sharp binaries from a custom URL,
-This involves an automated HTTPS download of approximately 7MB.
+set the `sharp_binary_host` npm config option
+or the `npm_config_sharp_binary_host` environment variable.
 
-Most recent Linux-based operating systems with glibc running on x64 and ARMv6+ CPUs should "just work", e.g.:
+To install the prebuilt sharp binaries from a directory on the local filesystem,
+set the `sharp_local_prebuilds` npm config option
+or the `npm_config_sharp_local_prebuilds` environment variable.
 
-* Debian 7+
+URL example:
-* Ubuntu 14.04+
+if `sharp_binary_host` is set to `https://hostname/path`
-* Centos 7+
+and the sharp version is `1.2.3` then the resultant URL will be
-* Fedora
+`https://hostname/path/sharp-v1.2.3-napi-v5-platform-arch.tar.gz`.
-* openSUSE 13.2+
-* Archlinux
-* Raspbian Jessie
-* Amazon Linux
-* Solus
 
-To use a globally-installed version of libvips instead of the provided binaries,
+Filename example:
-make sure it is at least the version listed under `config.libvips` in the `package.json` file
+if `sharp_local_prebuilds` is set to `/path`
-and that it can be located using `pkg-config --modversion vips-cpp`.
+and the sharp version is `1.2.3` then the resultant filename will be
+`/path/sharp-v1.2.3-napi-v5-platform-arch.tar.gz`.
 
-If you are using non-standard paths (anything other than `/usr` or `/usr/local`),
+### Prebuilt libvips binaries
-you might need to set `PKG_CONFIG_PATH` during `npm install`
-and `LD_LIBRARY_PATH` at runtime.
 
-This allows the use of newer versions of libvips with older versions of sharp.
+To install the prebuilt libvips binaries from a custom URL,
+set the `sharp_libvips_binary_host` npm config option
+or the `npm_config_sharp_libvips_binary_host` environment variable.
 
-For 32-bit Intel CPUs and older Linux-based operating systems such as Centos 6,
+To install the prebuilt libvips binaries from a directory on the local filesystem,
-it is recommended to install a system-wide installation of libvips from source:
+set the `sharp_libvips_local_prebuilds` npm config option
+or the `npm_config_sharp_libvips_local_prebuilds` environment variable.
 
-https://jcupitt.github.io/libvips/install.html#building-libvips-from-a-source-tarball
+The version subpath and filename are appended to these.
 
-#### Alpine Linux
+URL example:
+if `sharp_libvips_binary_host` is set to `https://hostname/path`
+and the libvips version is `4.5.6` then the resultant URL will be
+`https://hostname/path/v4.5.6/libvips-4.5.6-platform-arch.tar.br`.
 
-libvips is available in the
+Filename example:
-[testing repository](https://pkgs.alpinelinux.org/packages?name=vips-dev):
+if `sharp_libvips_local_prebuilds` is set to `/path`
+and the libvips version is `4.5.6` then the resultant filename will be
+`/path/v4.5.6/libvips-4.5.6-platform-arch.tar.br`.
+
+See the Chinese mirror below for a further example.
+
+## Chinese mirror
+
+A mirror site based in China, provided by Alibaba, contains binaries for both sharp and libvips.
+
+To use this either set the following configuration:
 
 ```sh
-apk add vips-dev fftw-dev --update-cache --repository https://dl-3.alpinelinux.org/alpine/edge/testing/
+npm config set sharp_binary_host "https://npmmirror.com/mirrors/sharp"
+npm config set sharp_libvips_binary_host "https://npmmirror.com/mirrors/sharp-libvips"
+npm install sharp
 ```
 
-The smaller stack size of musl libc means
+or set the following environment variables:
-libvips may need to be used without a cache
-via `sharp.cache(false)` to avoid a stack overflow.
 
-### Mac OS
+```sh
+npm_config_sharp_binary_host="https://npmmirror.com/mirrors/sharp" \
+  npm_config_sharp_libvips_binary_host="https://npmmirror.com/mirrors/sharp-libvips" \
+  npm install sharp
+```
 
-[![OS X 10.12 Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)
+## FreeBSD
 
-libvips and its dependencies are fetched and stored within `node_modules/sharp/vendor` during `npm install`.
+The `vips` package must be installed before `npm install` is run.
-This involves an automated HTTPS download of approximately 7MB.
-
-To use your own version of libvips instead of the provided binaries, make sure it is
-at least the version listed under `config.libvips` in the `package.json` file and
-that it can be located using `pkg-config --modversion vips-cpp`.
-
-### Windows x64
-
-[![Windows x64 Build Status](https://ci.appveyor.com/api/projects/status/pgtul704nkhhg6sg)](https://ci.appveyor.com/project/lovell/sharp)
-
-libvips and its dependencies are fetched and stored within `node_modules\sharp\vendor` during `npm install`.
-This involves an automated HTTPS download of approximately 12MB.
-
-Only 64-bit (x64) `node.exe` is supported.
-
-### FreeBSD
-
-libvips must be installed before `npm install` is run.
-
-This can be achieved via package or ports:
 
 ```sh
 pkg install -y pkgconf vips
@@ -112,174 +210,147 @@ pkg install -y pkgconf vips
 cd /usr/ports/graphics/vips/ && make install clean
 ```
 
-FreeBSD's gcc v4 and v5 need `CXXFLAGS=-D_GLIBCXX_USE_C99` set for C++11 support due to
+## Linux memory allocator
-https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193528
 
-### Heroku
+The default memory allocator on most glibc-based Linux systems
+(e.g. Debian, Red Hat) is unsuitable for long-running, multi-threaded
+processes that involve lots of small memory allocations.
 
-libvips and its dependencies are fetched and stored within `node_modules\sharp\vendor` during `npm install`.
+For this reason, by default, sharp will limit the use of thread-based
-This involves an automated HTTPS download of approximately 7MB.
+[concurrency](api-utility#concurrency) when the glibc allocator is
+detected at runtime.
 
-Set [NODE_MODULES_CACHE](https://devcenter.heroku.com/articles/nodejs-support#cache-behavior)
+To help avoid fragmentation and improve performance on these systems,
+the use of an alternative memory allocator such as
+[jemalloc](https://github.com/jemalloc/jemalloc) is recommended.
+
+Those using musl-based Linux (e.g. Alpine) and non-Linux systems are
+unaffected.
+
+## Heroku
+
+Add the
+[jemalloc buildpack](https://github.com/gaffneyc/heroku-buildpack-jemalloc)
+to reduce the effects of memory fragmentation.
+
+Set
+[NODE_MODULES_CACHE](https://devcenter.heroku.com/articles/nodejs-support#cache-behavior)
 to `false` when using the `yarn` package manager.
 
-### Docker
+## AWS Lambda
 
-[Marc Bachmann](https://github.com/marcbachmann) maintains an
+The `node_modules` directory of the
-[Ubuntu-based Dockerfile for libvips](https://github.com/marcbachmann/dockerfile-libvips).
+[deployment package](https://docs.aws.amazon.com/lambda/latest/dg/nodejs-package.html)
-
+must include binaries for the Linux x64 platform.
-```sh
+
-docker pull marcbachmann/libvips
+When building your deployment package on machines other than Linux x64 (glibc),
-```
+run the following additional command after `npm install`:
-
-[Will Jordan](https://github.com/wjordan) maintains an
-[Alpine-based Dockerfile for libvips](https://github.com/wjordan/dockerfile-libvips).
-
-```sh
-docker pull wjordan/libvips
-```
-
-[Tailor Brands](https://github.com/TailorBrands) maintain
-[Debian-based Dockerfiles for libvips and nodejs](https://github.com/TailorBrands/docker-libvips).
-
-```sh
-docker pull tailor/docker-libvips
-```
-
-### AWS Lambda
-
-A [deployment package](http://docs.aws.amazon.com/lambda/latest/dg/nodejs-create-deployment-pkg.html) for the
-[Lambda Execution Environment](http://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html)
-can be built using Docker.
 
 ```sh
+npm install
 rm -rf node_modules/sharp
-docker run -v "$PWD":/var/task lambci/lambda:build-nodejs6.10 npm install
+SHARP_IGNORE_GLOBAL_LIBVIPS=1 npm install --arch=x64 --platform=linux --libc=glibc sharp
 ```
 
-Set the Lambda runtime to Node.js 6.10.
+To get the best performance select the largest memory available.
+A 1536 MB function provides ~12x more CPU time than a 128 MB function.
 
-To get the best performance select the largest memory available. A 1536 MB function provides ~12x more CPU time than a 128 MB function.
+## Bundlers
 
-### NW.js
+### webpack
 
-Run the `nw-gyp` tool after installation.
+Ensure sharp is excluded from bundling via the
+[externals](https://webpack.js.org/configuration/externals/)
+configuration.
+
+```js
+externals: {
+  'sharp': 'commonjs sharp'
+}
+```
+
+### esbuild
+
+Ensure sharp is excluded from bundling via the
+[external](https://esbuild.github.io/api/#external)
+configuration.
+
+```js
+buildSync({
+  entryPoints: ['app.js'],
+  bundle: true,
+  platform: 'node',
+  external: ['sharp'],
+})
+```
 
 ```sh
-cd node-modules/sharp
+esbuild app.js --bundle --platform=node --external:sharp
-nw-gyp rebuild --arch=x64 --target=[your nw version]
-node node_modules/sharp/install/dll-copy
 ```
 
-See also http://docs.nwjs.io/en/latest/For%20Users/Advanced/Use%20Native%20Node%20Modules/
+For `serverless-esbuild`, ensure platform-specific binaries are installed
+via the `serverless.yml` configuration.
 
-### Build tools
+```yaml
-
+custom:
-* [gulp-responsive](https://www.npmjs.com/package/gulp-responsive)
+  esbuild:
-* [grunt-sharp](https://www.npmjs.com/package/grunt-sharp)
+    external:
-
+      - sharp
-### Coding tools
+    packagerOptions:
-
+      scripts:
-* [Sharp TypeScript Types](https://www.npmjs.com/package/@types/sharp)
+        - npm install --arch=x64 --platform=linux sharp
-
-### CLI tools
-
-* [sharp-cli](https://www.npmjs.com/package/sharp-cli)
-
-### Security
-
-Many users of this module process untrusted, user-supplied images,
-but there are aspects of security to consider when doing so.
-
-It is possible to compile libvips with support for various third-party image loaders.
-Each of these libraries has undergone differing levels of security testing.
-
-Whilst tools such as [American Fuzzy Lop](http://lcamtuf.coredump.cx/afl/)
-and [Valgrind](http://valgrind.org/) have been used to test
-the most popular web-based formats, as well as libvips itself,
-you are advised to perform your own testing and sandboxing.
-
-ImageMagick in particular has a relatively large attack surface,
-which can be partially mitigated with a
-[policy.xml](http://www.imagemagick.org/script/resources.php)
-configuration file to prevent the use of coders known to be vulnerable.
-
-```xml
-<policymap>
-  <policy domain="coder" rights="none" pattern="EPHEMERAL" />
-  <policy domain="coder" rights="none" pattern="URL" />
-  <policy domain="coder" rights="none" pattern="HTTPS" />
-  <policy domain="coder" rights="none" pattern="MVG" />
-  <policy domain="coder" rights="none" pattern="MSL" />
-  <policy domain="coder" rights="none" pattern="TEXT" />
-  <policy domain="coder" rights="none" pattern="SHOW" />
-  <policy domain="coder" rights="none" pattern="WIN" />
-  <policy domain="coder" rights="none" pattern="PLT" />
-</policymap>
 ```
 
-Set the `MAGICK_CONFIGURE_PATH` environment variable
+## Fonts
-to the directory containing the `policy.xml` file.
 
-### Pre-compiled libvips binaries
+When creating text images or rendering SVG images that contain text elements,
+`fontconfig` is used to find the relevant fonts.
 
-This module will attempt to download a pre-compiled bundle of libvips
+On Windows and macOS systems, all system fonts are available for use.
-and its dependencies on Linux and Windows machines under either of these
-conditions:
 
-1. If a global installation of libvips that meets the
+On macOS systems using Homebrew, you may need to set the
-minimum version requirement cannot be found;
+`PANGOCAIRO_BACKEND` environment variable to a value of `fontconfig`
-1. If `SHARP_IGNORE_GLOBAL_LIBVIPS` environment variable is set.
+to ensure it is used for font discovery instead of Core Text.
 
-```sh
+On Linux systems, fonts that include the relevant
-SHARP_IGNORE_GLOBAL_LIBVIPS=1 npm install sharp
+[`fontconfig` configuration](https://www.freedesktop.org/software/fontconfig/fontconfig-user.html)
+when installed via package manager are available for use.
+
+If `fontconfig` configuration is not found, the following error will occur:
+```
+Fontconfig error: Cannot load default config file
 ```
 
-Should you need to manually download and inspect these files,
+In serverless environments where there is no control over font packages,
-you can do so via https://github.com/lovell/sharp-libvips/releases
+use the `FONTCONFIG_PATH` environment variable to point to a custom location.
 
-Should you wish to install these from your own location,
+Embedded SVG fonts are unsupported.
-set the `SHARP_DIST_BASE_URL` environment variable, e.g.
 
-```sh
+## Worker threads
-SHARP_DIST_BASE_URL="https://hostname/path/" npm install sharp
+
+On some platforms, including glibc-based Linux,
+the main thread must call `require('sharp')`
+_before_ worker threads are created.
+This is to ensure shared libraries remain loaded in memory
+until after all threads are complete.
+
+Without this, the following error may occur:
+```
+Module did not self-register
 ```
 
-to use `https://hostname/path/libvips-x.y.z-platform.tar.gz`.
+## Known conflicts
 
-### Licences
+### Canvas and Windows
 
-This module is licensed under the terms of the
+The prebuilt binaries provided by `canvas` for Windows
-[Apache 2.0 Licence](https://github.com/lovell/sharp/blob/master/LICENSE).
+from v2.7.0 onwards depend on the Visual C++ Runtime (MSVCRT).
+These conflict with the binaries provided by sharp,
+which depend on the more modern Universal C Runtime (UCRT).
 
-The libraries downloaded and used by this module
+See [Automattic/node-canvas#2155](https://github.com/Automattic/node-canvas/issues/2155).
-are done so under the terms of the following licences,
-all of which are compatible with the Apache 2.0 Licence.
 
-Use of libraries under the terms of the LGPLv3 is via the
+If both modules are used in the same Windows process, the following error will occur:
-"any later version" clause of the LGPLv2 or LGPLv2.1.
+```
-
+The specified procedure could not be found.
-| Library       | Used under the terms of                                                                                  |
+```
-|---------------|----------------------------------------------------------------------------------------------------------|
-| cairo         | Mozilla Public License 2.0                                                                               |
-| expat         | MIT Licence                                                                                              |
-| fontconfig    | [fontconfig Licence](https://cgit.freedesktop.org/fontconfig/tree/COPYING) (BSD-like)                    |
-| freetype      | [freetype Licence](http://git.savannah.gnu.org/cgit/freetype/freetype2.git/tree/docs/FTL.TXT) (BSD-like) |
-| giflib        | MIT Licence                                                                                              |
-| glib          | LGPLv3                                                                                                   |
-| harfbuzz      | MIT Licence                                                                                              |
-| lcms          | MIT Licence                                                                                              |
-| libcroco      | LGPLv3                                                                                                   |
-| libexif       | LGPLv3                                                                                                   |
-| libffi        | MIT Licence                                                                                              |
-| libgsf        | LGPLv3                                                                                                   |
-| libjpeg-turbo | [zlib License, IJG License](https://github.com/libjpeg-turbo/libjpeg-turbo/blob/master/LICENSE.md)       |
-| libpng        | [libpng License](http://www.libpng.org/pub/png/src/libpng-LICENSE.txt)                                   |
-| librsvg       | LGPLv3                                                                                                   |
-| libtiff       | [libtiff License](http://www.libtiff.org/misc.html) (BSD-like)                                           |
-| libvips       | LGPLv3                                                                                                   |
-| libwebp       | New BSD License                                                                                          |
-| libxml2       | MIT Licence                                                                                              |
-| pango         | LGPLv3                                                                                                   |
-| pixman        | MIT Licence                                                                                              |
-| zlib          | [zlib Licence](https://github.com/madler/zlib/blob/master/zlib.h)                                        |

docs/performance.md

@@ -1,76 +1,71 @@
 # Performance
 
-### Test environment
+A test to benchmark the performance of this module relative to alternatives.
-
-* AWS EC2 eu-west-1 [c5.large](https://aws.amazon.com/ec2/instance-types/c5/) (2x Xeon Platinum 8124M CPU @ 3.00GHz)
-* Ubuntu 17.10 (hvm:ebs-ssd, 20180102, ami-0741d47e)
-* Node.js v8.9.4
-
-### The contenders
-
-* [jimp](https://www.npmjs.com/package/jimp) v0.2.28 - Image processing in pure JavaScript. Bilinear interpolation only.
-* [pajk-lwip](https://www.npmjs.com/package/pajk-lwip) v0.2.0 (fork) - Wrapper around CImg that compiles dependencies from source.
-* [mapnik](https://www.npmjs.org/package/mapnik) v3.6.2 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
-* [imagemagick-native](https://www.npmjs.com/package/imagemagick-native) v1.9.3 - Wrapper around libmagick++, supports Buffers only.
-* [imagemagick](https://www.npmjs.com/package/imagemagick) v0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
-* [gm](https://www.npmjs.com/package/gm) v1.23.1 - Fully featured wrapper around GraphicsMagick's `gm` command line utility.
-* [images](https://www.npmjs.com/package/images) v3.0.1 - Compiles dependencies from source. Provides bicubic interpolation.
-* sharp v0.19.0 / libvips v8.6.1 - Caching within libvips disabled to ensure a fair comparison.
-
-### The task
-
-Decompress a 2725x2225 JPEG image,
-resize to 720x588 using Lanczos 3 resampling (where available),
-then compress to JPEG at a "quality" setting of 80.
-
-### Results
-
-| Module             | Input  | Output | Ops/sec | Speed-up |
-| :----------------- | :----- | :----- | ------: | -------: |
-| jimp (bilinear)    | buffer | buffer |    1.14 |      1.0 |
-| lwip               | buffer | buffer |    1.86 |      1.6 |
-| mapnik             | buffer | buffer |    3.34 |      2.9 |
-| imagemagick-native | buffer | buffer |    4.13 |      3.6 |
-| gm                 | buffer | buffer |    4.21 |      3.7 |
-| gm                 | file   | file   |    4.27 |      3.7 |
-| imagemagick        | file   | file   |    4.67 |      4.1 |
-| images (bicubic)   | file   | file   |    6.22 |      5.5 |
-| sharp              | stream | stream |   24.43 |     21.4 |
-| sharp              | file   | file   |   25.97 |     22.7 |
-| sharp              | file   | buffer |   26.00 |     22.8 |
-| sharp              | buffer | file   |   26.33 |     23.0 |
-| sharp              | buffer | buffer |   26.43 |     23.1 |
 
 Greater libvips performance can be expected with caching enabled (default)
 and using 8+ core machines, especially those with larger L1/L2 CPU caches.
 
 The I/O limits of the relevant (de)compression library will generally determine maximum throughput.
 
-### Benchmark test prerequisites
+## The contenders
 
-Requires _ImageMagick_, _GraphicsMagick_ and _Mapnik_:
+* [jimp](https://www.npmjs.com/package/jimp) v0.16.2 - Image processing in pure JavaScript. Provides bicubic interpolation.
+* [imagemagick](https://www.npmjs.com/package/imagemagick) v0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
+* [gm](https://www.npmjs.com/package/gm) v1.25.0 - Fully featured wrapper around GraphicsMagick's `gm` command line utility.
+* [@squoosh/lib](https://www.npmjs.com/package/@squoosh/lib) v0.4.0 - Image libraries transpiled to WebAssembly, includes GPLv3 code.
+* [@squoosh/cli](https://www.npmjs.com/package/@squoosh/cli) v0.7.2 - Command line wrapper around `@squoosh/lib`, avoids GPLv3 by spawning process.
+* sharp v0.31.3 / libvips v8.13.3 - Caching within libvips disabled to ensure a fair comparison.
 
-```sh
+## The task
-brew install imagemagick
-brew install graphicsmagick
-brew install mapnik
-```
 
-```sh
+Decompress a 2725x2225 JPEG image,
-sudo apt-get install imagemagick libmagick++-dev graphicsmagick mapnik-dev
+resize to 720x588 using Lanczos 3 resampling (where available),
-```
+then compress to JPEG at a "quality" setting of 80.
 
-```sh
+## Results
-sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick mapnik-devel
-```
 
-### Running the benchmark test
+### AMD64
+
+* AWS EC2 eu-west-1 [c6a.xlarge](https://aws.amazon.com/ec2/instance-types/c6a/) (4x AMD EPYC 7R13)
+* Ubuntu 22.04 (ami-026e72e4e468afa7b)
+* Node.js 16.19.0
+
+| Module             | Input  | Output | Ops/sec | Speed-up |
+| :----------------- | :----- | :----- | ------: | -------: |
+| jimp               | buffer | buffer |    0.82 |      1.0 |
+| squoosh-cli        | file   | file   |    1.05 |      1.3 |
+| squoosh-lib        | buffer | buffer |    1.19 |      1.5 |
+| gm                 | buffer | buffer |    8.47 |     10.3 |
+| gm                 | file   | file   |    8.58 |     10.5 |
+| imagemagick        | file   | file   |    9.23 |     11.3 |
+| sharp              | stream | stream |   33.23 |     40.5 |
+| sharp              | file   | file   |   35.22 |     43.0 |
+| sharp              | buffer | buffer |   35.70 |     43.5 |
+
+### ARM64
+
+* AWS EC2 eu-west-1 [c7g.xlarge](https://aws.amazon.com/ec2/instance-types/c7g/) (4x ARM Graviton3)
+* Ubuntu 22.04 (ami-02142ceceb3933ff5)
+* Node.js 16.19.0
+
+| Module             | Input  | Output | Ops/sec | Speed-up |
+| :----------------- | :----- | :----- | ------: | -------: |
+| jimp               | buffer | buffer |    0.84 |      1.0 |
+| squoosh-cli        | file   | file   |    1.12 |      1.3 |
+| squoosh-lib        | buffer | buffer |    2.11 |      2.5 |
+| gm                 | buffer | buffer |   10.39 |     12.4 |
+| gm                 | file   | file   |   10.40 |     12.4 |
+| imagemagick        | file   | file   |   10.73 |     12.8 |
+| sharp              | stream | stream |   33.63 |     40.0 |
+| sharp              | file   | file   |   34.91 |     41.6 |
+| sharp              | buffer | buffer |   35.72 |     42.5 |
+
+## Running the benchmark test
+
+Requires Docker.
 
 ```sh
 git clone https://github.com/lovell/sharp.git
-cd sharp
+cd sharp/test/bench
-npm install
+./run-with-docker.sh
-cd test/bench
-npm install
-npm test
 ```

docs/robots.txt

@@ -0,0 +1,2 @@
+User-agent: *
+Disallow:

docs/search-index/build.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const { extractDescription, extractKeywords, extractParameters } = require('./extract');
+
+const searchIndex = [];
+
+// Install
+const contents = fs.readFileSync(path.join(__dirname, '..', 'install.md'), 'utf8');
+const matches = contents.matchAll(
+  /## (?<title>[A-Za-z0-9 ]+)\n\n(?<body>[^#]+)/gs
+);
+for (const match of matches) {
+  const { title, body } = match.groups;
+  const description = extractDescription(body);
+
+  searchIndex.push({
+    t: title,
+    d: description,
+    k: extractKeywords(`${title} ${description}`),
+    l: `/install#${title.toLowerCase().replace(/ /g, '-')}`
+  });
+}
+
+// API
+[
+  'constructor',
+  'input',
+  'output',
+  'resize',
+  'composite',
+  'operation',
+  'channel',
+  'colour',
+  'utility'
+].forEach((section) => {
+  const contents = fs.readFileSync(path.join(__dirname, '..', `api-${section}.md`), 'utf8');
+  const matches = contents.matchAll(
+    /\n## (?<title>[A-Za-z]+)\n\n(?<firstparagraph>.+?)\n\n(?<parameters>### Parameters.+?Returns)?/gs
+  );
+  for (const match of matches) {
+    const { title, firstparagraph, parameters } = match.groups;
+    const description = firstparagraph.startsWith('###')
+      ? 'Constructor'
+      : extractDescription(firstparagraph);
+    const parameterNames = parameters ? extractParameters(parameters) : '';
+
+    searchIndex.push({
+      t: title,
+      d: description,
+      k: extractKeywords(`${title} ${description} ${parameterNames}`),
+      l: `/api-${section}#${title.toLowerCase()}`
+    });
+  }
+});
+
+fs.writeFileSync(
+  path.join(__dirname, '..', 'search-index.json'),
+  JSON.stringify(searchIndex)
+);

docs/search-index/extract.js

@@ -0,0 +1,30 @@
+'use strict';
+
+const stopWords = require('./stop-words');
+
+const extractDescription = (str) =>
+  str
+    .replace(/### Examples.*/sg, '')
+    .replace(/\(http[^)]+/g, '')
+    .replace(/\s+/g, ' ')
+    .replace(/[^A-Za-z0-9_/\-,. ]/g, '')
+    .replace(/\s+/g, ' ')
+    .substring(0, 200)
+    .trim();
+
+const extractParameters = (str) =>
+  [...str.matchAll(/options\.(?<name>[^.`]+)/gs)]
+    .map((match) => match.groups.name)
+    .join(' ');
+
+const extractKeywords = (str) =>
+  [
+    ...new Set(
+      str
+        .split(/[ -/]/)
+        .map((word) => word.toLowerCase().replace(/[^a-z]/g, ''))
+        .filter((word) => word.length > 2 && word.length < 15 && !stopWords.includes(word))
+    )
+  ].join(' ');
+
+module.exports = { extractDescription, extractKeywords, extractParameters };

docs/search-index/stop-words.js

@@ -0,0 +1,124 @@
+'use strict';
+
+module.exports = [
+  'about',
+  'after',
+  'all',
+  'allows',
+  'already',
+  'also',
+  'alternative',
+  'always',
+  'and',
+  'any',
+  'are',
+  'available',
+  'based',
+  'been',
+  'before',
+  'both',
+  'call',
+  'callback',
+  'can',
+  'containing',
+  'contains',
+  'created',
+  'current',
+  'date',
+  'default',
+  'does',
+  'each',
+  'either',
+  'ensure',
+  'entirely',
+  'etc',
+  'every',
+  'except',
+  'following',
+  'for',
+  'from',
+  'get',
+  'gets',
+  'given',
+  'has',
+  'have',
+  'how',
+  'image',
+  'implies',
+  'include',
+  'including',
+  'involve',
+  'its',
+  'last',
+  'least',
+  'lots',
+  'make',
+  'may',
+  'more',
+  'most',
+  'much',
+  'must',
+  'non',
+  'not',
+  'occur',
+  'occurs',
+  'options',
+  'other',
+  'out',
+  'over',
+  'perform',
+  'performs',
+  'produce',
+  'provide',
+  'provided',
+  'ready',
+  'requires',
+  'requiresharp',
+  'returned',
+  'run',
+  'same',
+  'see',
+  'set',
+  'sets',
+  'sharp',
+  'should',
+  'since',
+  'site',
+  'some',
+  'specified',
+  'spelling',
+  'such',
+  'support',
+  'supported',
+  'sure',
+  'take',
+  'task',
+  'than',
+  'that',
+  'the',
+  'their',
+  'then',
+  'there',
+  'therefore',
+  'these',
+  'this',
+  'under',
+  'unless',
+  'unmaintained',
+  'unsuitable',
+  'until',
+  'use',
+  'used',
+  'using',
+  'value',
+  'values',
+  'were',
+  'when',
+  'which',
+  'while',
+  'will',
+  'with',
+  'without',
+  'you',
+  'your'
+];

install/can-compile.js

@@ -0,0 +1,11 @@
+'use strict';
+
+const libvips = require('../lib/libvips');
+
+try {
+  if (!(libvips.useGlobalLibvips() || libvips.hasVendoredLibvips())) {
+    process.exitCode = 1;
+  }
+} catch (err) {
+  process.exitCode = 1;
+}

install/dll-copy.js

@@ -3,19 +3,21 @@
 const fs = require('fs');
 const path = require('path');
 
-const copyFileSync = require('fs-copy-file-sync');
+const libvips = require('../lib/libvips');
-const npmLog = require('npmlog');
+const platform = require('../lib/platform');
 
-if (process.platform === 'win32') {
+const minimumLibvipsVersion = libvips.minimumLibvipsVersion;
-  const buildDir = path.join(__dirname, '..', 'build');
+
-  const buildReleaseDir = path.join(buildDir, 'Release');
+const platformAndArch = platform();
-  npmLog.info('sharp', `Creating ${buildReleaseDir}`);
+
+if (platformAndArch.startsWith('win32')) {
+  const buildReleaseDir = path.join(__dirname, '..', 'build', 'Release');
+  libvips.log(`Creating ${buildReleaseDir}`);
   try {
-    fs.mkdirSync(buildDir);
+    libvips.mkdirSync(buildReleaseDir);
-    fs.mkdirSync(buildReleaseDir);
   } catch (err) {}
-  const vendorLibDir = path.join(__dirname, '..', 'vendor', 'lib');
+  const vendorLibDir = path.join(__dirname, '..', 'vendor', minimumLibvipsVersion, platformAndArch, 'lib');
-  npmLog.info('sharp', `Copying DLLs from ${vendorLibDir} to ${buildReleaseDir}`);
+  libvips.log(`Copying DLLs from ${vendorLibDir} to ${buildReleaseDir}`);
   try {
     fs
       .readdirSync(vendorLibDir)
@@ -23,12 +25,13 @@ if (process.platform === 'win32') {
         return /\.dll$/.test(filename);
       })
       .forEach(function (filename) {
-        copyFileSync(
+        fs.copyFileSync(
           path.join(vendorLibDir, filename),
           path.join(buildReleaseDir, filename)
         );
       });
   } catch (err) {
-    npmLog.error('sharp', err.message);
+    libvips.log(err);
+    process.exit(1);
   }
 }

install/libvips.js

@@ -3,92 +3,214 @@
 const fs = require('fs');
 const os = require('os');
 const path = require('path');
+const stream = require('stream');
+const zlib = require('zlib');
+const { createHash } = require('crypto');
 
 const detectLibc = require('detect-libc');
-const npmLog = require('npmlog');
+const semverLessThan = require('semver/functions/lt');
-const semver = require('semver');
+const semverSatisfies = require('semver/functions/satisfies');
 const simpleGet = require('simple-get');
-const tar = require('tar');
+const tarFs = require('tar-fs');
 
 const agent = require('../lib/agent');
 const libvips = require('../lib/libvips');
 const platform = require('../lib/platform');
 
-const minimumLibvipsVersion = libvips.minimumLibvipsVersion;
+const minimumGlibcVersionByArch = {
-const distBaseUrl = process.env.SHARP_DIST_BASE_URL || `https://github.com/lovell/sharp-libvips/releases/download/v${minimumLibvipsVersion}/`;
+  arm: '2.28',
+  arm64: '2.17',
+  x64: '2.17'
+};
 
-const extractTarball = function (tarPath) {
+const hasSharpPrebuild = [
-  const vendorPath = path.join(__dirname, '..', 'vendor');
+  'darwin-x64',
-  if (!fs.existsSync(vendorPath)) {
+  'darwin-arm64',
-    fs.mkdirSync(vendorPath);
+  'linux-arm64',
+  'linux-x64',
+  'linuxmusl-x64',
+  'linuxmusl-arm64',
+  'win32-ia32',
+  'win32-x64'
+];
+
+const { minimumLibvipsVersion, minimumLibvipsVersionLabelled } = libvips;
+const localLibvipsDir = process.env.npm_config_sharp_libvips_local_prebuilds || '';
+const distHost = process.env.npm_config_sharp_libvips_binary_host || 'https://github.com/lovell/sharp-libvips/releases/download';
+const distBaseUrl = process.env.npm_config_sharp_dist_base_url || process.env.SHARP_DIST_BASE_URL || `${distHost}/v${minimumLibvipsVersionLabelled}/`;
+const installationForced = !!(process.env.npm_config_sharp_install_force || process.env.SHARP_INSTALL_FORCE);
+
+const fail = function (err) {
+  libvips.log(err);
+  if (err.code === 'EACCES') {
+    libvips.log('Are you trying to install as a root or sudo user?');
+    libvips.log('- For npm <= v6, try again with the "--unsafe-perm" flag');
+    libvips.log('- For npm >= v8, the user must own the directory "npm install" is run in');
   }
-  tar
+  libvips.log('Please see https://sharp.pixelplumbing.com/install for required dependencies');
-    .extract({
+  process.exit(1);
-      file: tarPath,
+};
-      cwd: vendorPath,
+
-      strict: true
+const handleError = function (err) {
-    })
+  if (installationForced) {
-    .catch(function (err) {
+    libvips.log(`Installation warning: ${err.message}`);
-      throw err;
+  } else {
-    });
+    throw err;
+  }
+};
+
+const verifyIntegrity = function (platformAndArch) {
+  const expected = libvips.integrity(platformAndArch);
+  if (installationForced || !expected) {
+    libvips.log(`Integrity check skipped for ${platformAndArch}`);
+    return new stream.PassThrough();
+  }
+  const hash = createHash('sha512');
+  return new stream.Transform({
+    transform: function (chunk, _encoding, done) {
+      hash.update(chunk);
+      done(null, chunk);
+    },
+    flush: function (done) {
+      const digest = `sha512-${hash.digest('base64')}`;
+      if (expected !== digest) {
+        libvips.removeVendoredLibvips();
+        libvips.log(`Integrity expected: ${expected}`);
+        libvips.log(`Integrity received: ${digest}`);
+        done(new Error(`Integrity check failed for ${platformAndArch}`));
+      } else {
+        libvips.log(`Integrity check passed for ${platformAndArch}`);
+        done();
+      }
+    }
+  });
+};
+
+const extractTarball = function (tarPath, platformAndArch) {
+  const versionedVendorPath = path.join(__dirname, '..', 'vendor', minimumLibvipsVersion, platformAndArch);
+  libvips.mkdirSync(versionedVendorPath);
+
+  const ignoreVendorInclude = hasSharpPrebuild.includes(platformAndArch) && !process.env.npm_config_build_from_source;
+  const ignore = function (name) {
+    return ignoreVendorInclude && name.includes('include/');
+  };
+
+  stream.pipeline(
+    fs.createReadStream(tarPath),
+    verifyIntegrity(platformAndArch),
+    new zlib.BrotliDecompress(),
+    tarFs.extract(versionedVendorPath, { ignore }),
+    function (err) {
+      if (err) {
+        if (/unexpected end of file/.test(err.message)) {
+          fail(new Error(`Please delete ${tarPath} as it is not a valid tarball`));
+        }
+        fail(err);
+      }
+    }
+  );
 };
 
 try {
   const useGlobalLibvips = libvips.useGlobalLibvips();
+
   if (useGlobalLibvips) {
     const globalLibvipsVersion = libvips.globalLibvipsVersion();
-    npmLog.info('sharp', `Detected globally-installed libvips v${globalLibvipsVersion}`);
+    libvips.log(`Detected globally-installed libvips v${globalLibvipsVersion}`);
-    npmLog.info('sharp', 'Building from source via node-gyp');
+    libvips.log('Building from source via node-gyp');
     process.exit(1);
   } else if (libvips.hasVendoredLibvips()) {
-    npmLog.info('sharp', `Using existing vendored libvips v${minimumLibvipsVersion}`);
+    libvips.log(`Using existing vendored libvips v${minimumLibvipsVersion}`);
   } else {
     // Is this arch/platform supported?
     const arch = process.env.npm_config_arch || process.arch;
     const platformAndArch = platform();
-    if (platformAndArch === 'win32-ia32') {
+    if (arch === 'ia32' && !platformAndArch.startsWith('win32')) {
-      throw new Error('Windows x86 (32-bit) node.exe is not supported');
-    }
-    if (arch === 'ia32') {
       throw new Error(`Intel Architecture 32-bit systems require manual installation of libvips >= ${minimumLibvipsVersion}`);
     }
-    if (platformAndArch === 'freebsd-x64') {
+    if (platformAndArch === 'darwin-arm64') {
-      throw new Error(`FreeBSD systems require manual installation of libvips >= ${minimumLibvipsVersion}`);
+      throw new Error("Please run 'brew install vips' to install libvips on Apple M1 (ARM64) systems");
     }
-    if (detectLibc.isNonGlibcLinux) {
+    if (platformAndArch === 'freebsd-x64' || platformAndArch === 'openbsd-x64' || platformAndArch === 'sunos-x64') {
-      throw new Error(`Use with ${detectLibc.family} libc requires manual installation of libvips >= ${minimumLibvipsVersion}`);
+      throw new Error(`BSD/SunOS systems require manual installation of libvips >= ${minimumLibvipsVersion}`);
     }
-    if (detectLibc.family === detectLibc.GLIBC && detectLibc.version && semver.lt(`${detectLibc.version}.0`, '2.13.0')) {
+    // Linux libc version check
-      throw new Error(`Use with glibc version ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`);
+    const libcFamily = detectLibc.familySync();
+    const libcVersion = detectLibc.versionSync();
+    if (libcFamily === detectLibc.GLIBC && libcVersion && minimumGlibcVersionByArch[arch]) {
+      const libcVersionWithoutPatch = libcVersion.split('.').slice(0, 2).join('.');
+      if (semverLessThan(`${libcVersionWithoutPatch}.0`, `${minimumGlibcVersionByArch[arch]}.0`)) {
+        handleError(new Error(`Use with glibc ${libcVersion} requires manual installation of libvips >= ${minimumLibvipsVersion}`));
+      }
     }
+    if (libcFamily === detectLibc.MUSL && libcVersion) {
+      if (semverLessThan(libcVersion, '1.1.24')) {
+        handleError(new Error(`Use with musl ${libcVersion} requires manual installation of libvips >= ${minimumLibvipsVersion}`));
+      }
+    }
+    // Node.js minimum version check
+    const supportedNodeVersion = process.env.npm_package_engines_node || require('../package.json').engines.node;
+    if (!semverSatisfies(process.versions.node, supportedNodeVersion)) {
+      handleError(new Error(`Expected Node.js version ${supportedNodeVersion} but found ${process.versions.node}`));
+    }
+
     // Download to per-process temporary file
-    const tarFilename = ['libvips', minimumLibvipsVersion, platformAndArch].join('-') + '.tar.gz';
+    const tarFilename = ['libvips', minimumLibvipsVersionLabelled, platformAndArch].join('-') + '.tar.br';
     const tarPathCache = path.join(libvips.cachePath(), tarFilename);
     if (fs.existsSync(tarPathCache)) {
-      npmLog.info('sharp', `Using cached ${tarPathCache}`);
+      libvips.log(`Using cached ${tarPathCache}`);
-      extractTarball(tarPathCache);
+      extractTarball(tarPathCache, platformAndArch);
+    } else if (localLibvipsDir) {
+      // If localLibvipsDir is given try to use binaries from local directory
+      const tarPathLocal = path.join(path.resolve(localLibvipsDir), `v${minimumLibvipsVersionLabelled}`, tarFilename);
+      libvips.log(`Using local libvips from ${tarPathLocal}`);
+      extractTarball(tarPathLocal, platformAndArch);
     } else {
-      const tarPathTemp = path.join(os.tmpdir(), `${process.pid}-${tarFilename}`);
-      const tmpFile = fs.createWriteStream(tarPathTemp);
       const url = distBaseUrl + tarFilename;
-      npmLog.info('sharp', `Downloading ${url}`);
+      libvips.log(`Downloading ${url}`);
-      simpleGet({ url: url, agent: agent() }, function (err, response) {
+      simpleGet({ url: url, agent: agent(libvips.log) }, function (err, response) {
         if (err) {
-          throw err;
+          fail(err);
+        } else if (response.statusCode === 404) {
+          fail(new Error(`Prebuilt libvips ${minimumLibvipsVersion} binaries are not yet available for ${platformAndArch}`));
+        } else if (response.statusCode !== 200) {
+          fail(new Error(`Status ${response.statusCode} ${response.statusMessage}`));
+        } else {
+          const tarPathTemp = path.join(os.tmpdir(), `${process.pid}-${tarFilename}`);
+          const tmpFileStream = fs.createWriteStream(tarPathTemp);
+          response
+            .on('error', function (err) {
+              tmpFileStream.destroy(err);
+            })
+            .on('close', function () {
+              if (!response.complete) {
+                tmpFileStream.destroy(new Error('Download incomplete (connection was terminated)'));
+              }
+            })
+            .pipe(tmpFileStream);
+          tmpFileStream
+            .on('error', function (err) {
+              // Clean up temporary file
+              try {
+                fs.unlinkSync(tarPathTemp);
+              } catch (e) {}
+              fail(err);
+            })
+            .on('close', function () {
+              try {
+                // Attempt to rename
+                fs.renameSync(tarPathTemp, tarPathCache);
+              } catch (err) {
+                // Fall back to copy and unlink
+                fs.copyFileSync(tarPathTemp, tarPathCache);
+                fs.unlinkSync(tarPathTemp);
+              }
+              extractTarball(tarPathCache, platformAndArch);
+            });
         }
-        if (response.statusCode !== 200) {
-          throw new Error(`Status ${response.statusCode}`);
-        }
-        response.pipe(tmpFile);
-      });
-      tmpFile.on('close', function () {
-        fs.renameSync(tarPathTemp, tarPathCache);
-        extractTarball(tarPathCache);
       });
     }
   }
 } catch (err) {
-  npmLog.error('sharp', err.message);
+  fail(err);
-  npmLog.error('sharp', 'Please see http://sharp.pixelplumbing.com/page/install');
-  process.exit(1);
 }

lib/agent.js

@@ -18,17 +18,21 @@ function env (key) {
   return process.env[key];
 }
 
-module.exports = function () {
+module.exports = function (log) {
   try {
-    const proxy = url.parse(proxies.map(env).find(is.string));
+    const proxy = new url.URL(proxies.map(env).find(is.string));
     const tunnel = proxy.protocol === 'https:'
       ? tunnelAgent.httpsOverHttps
       : tunnelAgent.httpsOverHttp;
+    const proxyAuth = proxy.username && proxy.password
+      ? `${decodeURIComponent(proxy.username)}:${decodeURIComponent(proxy.password)}`
+      : null;
+    log(`Via proxy ${proxy.protocol}://${proxy.hostname}:${proxy.port} ${proxyAuth ? 'with' : 'no'} credentials`);
     return tunnel({
       proxy: {
         port: Number(proxy.port),
         host: proxy.hostname,
-        proxyAuth: proxy.auth
+        proxyAuth
       }
     });
   } catch (err) {

lib/channel.js

@@ -15,6 +15,8 @@ const bool = {
 /**
  * Remove alpha channel, if any. This is a no-op if the image does not have an alpha channel.
  *
+ * See also {@link /api-operation#flatten|flatten}.
+ *
  * @example
  * sharp('rgba.png')
  *   .removeAlpha()
@@ -29,33 +31,72 @@ function removeAlpha () {
   return this;
 }
 
+/**
+ * Ensure the output image has an alpha transparency channel.
+ * If missing, the added alpha channel will have the specified
+ * transparency level, defaulting to fully-opaque (1).
+ * This is a no-op if the image already has an alpha channel.
+ *
+ * @since 0.21.2
+ *
+ * @example
+ * // rgba.png will be a 4 channel image with a fully-opaque alpha channel
+ * await sharp('rgb.jpg')
+ *   .ensureAlpha()
+ *   .toFile('rgba.png')
+ *
+ * @example
+ * // rgba is a 4 channel image with a fully-transparent alpha channel
+ * const rgba = await sharp(rgb)
+ *   .ensureAlpha(0)
+ *   .toBuffer();
+ *
+ * @param {number} [alpha=1] - alpha transparency level (0=fully-transparent, 1=fully-opaque)
+ * @returns {Sharp}
+ * @throws {Error} Invalid alpha transparency level
+ */
+function ensureAlpha (alpha) {
+  if (is.defined(alpha)) {
+    if (is.number(alpha) && is.inRange(alpha, 0, 1)) {
+      this.options.ensureAlpha = alpha;
+    } else {
+      throw is.invalidParameterError('alpha', 'number between 0 and 1', alpha);
+    }
+  } else {
+    this.options.ensureAlpha = 1;
+  }
+  return this;
+}
+
 /**
  * Extract a single channel from a multi-channel image.
  *
  * @example
- * sharp(input)
+ * // green.jpg is a greyscale image containing the green channel of the input
+ * await sharp(input)
  *   .extractChannel('green')
- *   .toFile('input_green.jpg', function(err, info) {
+ *   .toFile('green.jpg');
- *     // info.channels === 1
- *     // input_green.jpg contains the green channel of the input image
- *    });
  *
- * @param {Number|String} channel - zero-indexed band number to extract, or `red`, `green` or `blue` as alternative to `0`, `1` or `2` respectively.
+ * @example
+ * // red1 is the red value of the first pixel, red2 the second pixel etc.
+ * const [red1, red2, ...] = await sharp(input)
+ *   .extractChannel(0)
+ *   .raw()
+ *   .toBuffer();
+ *
+ * @param {number|string} channel - zero-indexed channel/band number to extract, or `red`, `green`, `blue` or `alpha`.
  * @returns {Sharp}
  * @throws {Error} Invalid channel
  */
 function extractChannel (channel) {
-  if (channel === 'red') {
+  const channelMap = { red: 0, green: 1, blue: 2, alpha: 3 };
-    channel = 0;
+  if (Object.keys(channelMap).includes(channel)) {
-  } else if (channel === 'green') {
+    channel = channelMap[channel];
-    channel = 1;
-  } else if (channel === 'blue') {
-    channel = 2;
   }
   if (is.integer(channel) && is.inRange(channel, 0, 4)) {
     this.options.extractChannel = channel;
   } else {
-    throw new Error('Cannot extract invalid channel ' + channel);
+    throw is.invalidParameterError('channel', 'integer or one of: red, green, blue, alpha', channel);
   }
   return this;
 }
@@ -68,10 +109,10 @@ function extractChannel (channel) {
  * - sRGB: 0: Red, 1: Green, 2: Blue, 3: Alpha.
  * - CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha.
  *
- * Buffers may be any of the image formats supported by sharp: JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data.
+ * Buffers may be any of the image formats supported by sharp.
  * For raw pixel input, the `options` object should contain a `raw` attribute, which follows the format of the attribute of the same name in the `sharp()` constructor.
  *
- * @param {Array<String|Buffer>|String|Buffer} images - one or more images (file paths, Buffers).
+ * @param {Array<string|Buffer>|string|Buffer} images - one or more images (file paths, Buffers).
  * @param {Object} options - image options, see `sharp()` constructor.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
@@ -99,7 +140,7 @@ function joinChannel (images, options) {
  *     // then `O(1,1) = 0b11110111 & 0b10101010 & 0b00001111 = 0b00000010 = 2`.
  *   });
  *
- * @param {String} boolOp - one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+ * @param {string} boolOp - one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -107,7 +148,7 @@ function bandbool (boolOp) {
   if (is.string(boolOp) && is.inArray(boolOp, ['and', 'or', 'eor'])) {
     this.options.bandBoolOp = boolOp;
   } else {
-    throw new Error('Invalid bandbool operation ' + boolOp);
+    throw is.invalidParameterError('boolOp', 'one of: and, or, eor', boolOp);
   }
   return this;
 }
@@ -117,14 +158,13 @@ function bandbool (boolOp) {
  * @private
  */
 module.exports = function (Sharp) {
-  // Public instance functions
+  Object.assign(Sharp.prototype, {
-  [
+    // Public instance functions
     removeAlpha,
+    ensureAlpha,
     extractChannel,
     joinChannel,
     bandbool
-  ].forEach(function (f) {
-    Sharp.prototype[f.name] = f;
   });
   // Class attributes
   Sharp.bool = bool;

lib/colour.js

@@ -15,34 +15,16 @@ const colourspace = {
   srgb: 'srgb'
 };
 
-/**
- * Set the background for the `embed`, `flatten` and `extend` operations.
- * The default background is `{r: 0, g: 0, b: 0, alpha: 1}`, black without transparency.
- *
- * Delegates to the _color_ module, which can throw an Error
- * but is liberal in what it accepts, clipping values to sensible min/max.
- * The alpha value is a float between `0` (transparent) and `1` (opaque).
- *
- * @param {String|Object} rgba - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
- * @returns {Sharp}
- * @throws {Error} Invalid parameter
- */
-function background (rgba) {
-  const colour = color(rgba);
-  this.options.background = [
-    colour.red(),
-    colour.green(),
-    colour.blue(),
-    Math.round(colour.alpha() * 255)
-  ];
-  return this;
-}
-
 /**
  * Tint the image using the provided chroma while preserving the image luminance.
  * An alpha channel may be present and will be unchanged by the operation.
  *
- * @param {String|Object} rgb - parsed by the [color](https://www.npmjs.org/package/color) module to extract chroma values.
+ * @example
+ * const output = await sharp(input)
+ *   .tint({ r: 255, g: 240, b: 16 })
+ *   .toBuffer();
+ *
+ * @param {string|Object} rgb - parsed by the [color](https://www.npmjs.org/package/color) module to extract chroma values.
  * @returns {Sharp}
  * @throws {Error} Invalid parameter
  */
@@ -60,6 +42,10 @@ function tint (rgb) {
  * This may be overridden by other sharp operations such as `toColourspace('b-w')`,
  * which will produce an output image containing one color channel.
  * An alpha channel may be present, and will be unchanged by the operation.
+ *
+ * @example
+ * const output = await sharp(input).greyscale().toBuffer();
+ *
  * @param {Boolean} [greyscale=true]
  * @returns {Sharp}
  */
@@ -77,16 +63,62 @@ function grayscale (grayscale) {
   return this.greyscale(grayscale);
 }
 
+/**
+ * Set the pipeline colourspace.
+ *
+ * The input image will be converted to the provided colourspace at the start of the pipeline.
+ * All operations will use this colourspace before converting to the output colourspace, as defined by {@link toColourspace}.
+ *
+ * This feature is experimental and has not yet been fully-tested with all operations.
+ *
+ * @since 0.29.0
+ *
+ * @example
+ * // Run pipeline in 16 bits per channel RGB while converting final result to 8 bits per channel sRGB.
+ * await sharp(input)
+ *  .pipelineColourspace('rgb16')
+ *  .toColourspace('srgb')
+ *  .toFile('16bpc-pipeline-to-8bpc-output.png')
+ *
+ * @param {string} [colourspace] - pipeline colourspace e.g. `rgb16`, `scrgb`, `lab`, `grey16` [...](https://github.com/libvips/libvips/blob/41cff4e9d0838498487a00623462204eb10ee5b8/libvips/iofuncs/enumtypes.c#L774)
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function pipelineColourspace (colourspace) {
+  if (!is.string(colourspace)) {
+    throw is.invalidParameterError('colourspace', 'string', colourspace);
+  }
+  this.options.colourspaceInput = colourspace;
+  return this;
+}
+
+/**
+ * Alternative spelling of `pipelineColourspace`.
+ * @param {string} [colorspace] - pipeline colorspace.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function pipelineColorspace (colorspace) {
+  return this.pipelineColourspace(colorspace);
+}
+
 /**
  * Set the output colourspace.
  * By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
- * @param {String} [colourspace] - output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568)
+ *
+ * @example
+ * // Output 16 bits per pixel RGB
+ * await sharp(input)
+ *  .toColourspace('rgb16')
+ *  .toFile('16-bpp.png')
+ *
+ * @param {string} [colourspace] - output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://github.com/libvips/libvips/blob/3c0bfdf74ce1dc37a6429bed47fa76f16e2cd70a/libvips/iofuncs/enumtypes.c#L777-L794)
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
 function toColourspace (colourspace) {
   if (!is.string(colourspace)) {
-    throw new Error('Invalid output colourspace ' + colourspace);
+    throw is.invalidParameterError('colourspace', 'string', colourspace);
   }
   this.options.colourspace = colourspace;
   return this;
@@ -94,7 +126,7 @@ function toColourspace (colourspace) {
 
 /**
  * Alternative spelling of `toColourspace`.
- * @param {String} [colorspace] - output colorspace.
+ * @param {string} [colorspace] - output colorspace.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -102,21 +134,45 @@ function toColorspace (colorspace) {
   return this.toColourspace(colorspace);
 }
 
+/**
+ * Update a colour attribute of the this.options Object.
+ * @private
+ * @param {string} key
+ * @param {string|Object} value
+ * @throws {Error} Invalid value
+ */
+function _setBackgroundColourOption (key, value) {
+  if (is.defined(value)) {
+    if (is.object(value) || is.string(value)) {
+      const colour = color(value);
+      this.options[key] = [
+        colour.red(),
+        colour.green(),
+        colour.blue(),
+        Math.round(colour.alpha() * 255)
+      ];
+    } else {
+      throw is.invalidParameterError('background', 'object or string', value);
+    }
+  }
+}
+
 /**
  * Decorate the Sharp prototype with colour-related functions.
  * @private
  */
 module.exports = function (Sharp) {
-  // Public instance functions
+  Object.assign(Sharp.prototype, {
-  [
+    // Public
-    background,
     tint,
     greyscale,
     grayscale,
+    pipelineColourspace,
+    pipelineColorspace,
     toColourspace,
-    toColorspace
+    toColorspace,
-  ].forEach(function (f) {
+    // Private
-    Sharp.prototype[f.name] = f;
+    _setBackgroundColourOption
   });
   // Class attributes
   Sharp.colourspace = colourspace;

lib/composite.js

@@ -3,20 +3,82 @@
 const is = require('./is');
 
 /**
- * Overlay (composite) an image over the processed (resized, extracted etc.) image.
+ * Blend modes.
+ * @member
+ * @private
+ */
+const blend = {
+  clear: 'clear',
+  source: 'source',
+  over: 'over',
+  in: 'in',
+  out: 'out',
+  atop: 'atop',
+  dest: 'dest',
+  'dest-over': 'dest-over',
+  'dest-in': 'dest-in',
+  'dest-out': 'dest-out',
+  'dest-atop': 'dest-atop',
+  xor: 'xor',
+  add: 'add',
+  saturate: 'saturate',
+  multiply: 'multiply',
+  screen: 'screen',
+  overlay: 'overlay',
+  darken: 'darken',
+  lighten: 'lighten',
+  'colour-dodge': 'colour-dodge',
+  'color-dodge': 'colour-dodge',
+  'colour-burn': 'colour-burn',
+  'color-burn': 'colour-burn',
+  'hard-light': 'hard-light',
+  'soft-light': 'soft-light',
+  difference: 'difference',
+  exclusion: 'exclusion'
+};
+
+/**
+ * Composite image(s) over the processed (resized, extracted etc.) image.
  *
- * The overlay image must be the same size or smaller than the processed image.
+ * The images to composite must be the same size or smaller than the processed image.
  * If both `top` and `left` options are provided, they take precedence over `gravity`.
  *
- * If the overlay image contains an alpha channel then composition with premultiplication will occur.
+ * Any resize or rotate operations in the same processing pipeline
+ * will always be applied to the input image before composition.
+ *
+ * The `blend` option can be one of `clear`, `source`, `over`, `in`, `out`, `atop`,
+ * `dest`, `dest-over`, `dest-in`, `dest-out`, `dest-atop`,
+ * `xor`, `add`, `saturate`, `multiply`, `screen`, `overlay`, `darken`, `lighten`,
+ * `colour-dodge`, `color-dodge`, `colour-burn`,`color-burn`,
+ * `hard-light`, `soft-light`, `difference`, `exclusion`.
+ *
+ * More information about blend modes can be found at
+ * https://www.libvips.org/API/current/libvips-conversion.html#VipsBlendMode
+ * and https://www.cairographics.org/operators/
+ *
+ * @since 0.22.0
+ *
+ * @example
+ * await sharp(background)
+ *   .composite([
+ *     { input: layer1, gravity: 'northwest' },
+ *     { input: layer2, gravity: 'southeast' },
+ *   ])
+ *   .toFile('combined.png');
+ *
+ * @example
+ * const output = await sharp('input.gif', { animated: true })
+ *   .composite([
+ *     { input: 'overlay.png', tile: true, blend: 'saturate' }
+ *   ])
+ *   .toBuffer();
  *
  * @example
  * sharp('input.png')
  *   .rotate(180)
  *   .resize(300)
- *   .flatten()
+ *   .flatten( { background: '#ff6600' } )
- *   .background('#ff6600')
+ *   .composite([{ input: 'overlay.png', gravity: 'southeast' }])
- *   .overlayWith('overlay.png', { gravity: sharp.gravity.southeast } )
  *   .sharpen()
  *   .withMetadata()
  *   .webp( { quality: 90 } )
@@ -27,63 +89,111 @@ const is = require('./is');
  *     // sharpened, with metadata, 90% quality WebP image data. Phew!
  *   });
  *
- * @param {(Buffer|String)} overlay - Buffer containing image data or String containing the path to an image file.
+ * @param {Object[]} images - Ordered list of images to composite
- * @param {Object} [options]
+ * @param {Buffer|String} [images[].input] - Buffer containing image data, String containing the path to an image file, or Create object (see below)
- * @param {String} [options.gravity='centre'] - gravity at which to place the overlay.
+ * @param {Object} [images[].input.create] - describes a blank overlay to be created.
- * @param {Number} [options.top] - the pixel offset from the top edge.
+ * @param {Number} [images[].input.create.width]
- * @param {Number} [options.left] - the pixel offset from the left edge.
+ * @param {Number} [images[].input.create.height]
- * @param {Boolean} [options.tile=false] - set to true to repeat the overlay image across the entire image with the given `gravity`.
+ * @param {Number} [images[].input.create.channels] - 3-4
- * @param {Boolean} [options.cutout=false] - set to true to apply only the alpha channel of the overlay image to the input image, giving the appearance of one image being cut out of another.
+ * @param {String|Object} [images[].input.create.background] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
- * @param {Number} [options.density=72] - integral number representing the DPI for vector overlay image.
+ * @param {Object} [images[].input.text] - describes a new text image to be created.
- * @param {Object} [options.raw] - describes overlay when using raw pixel data.
+ * @param {string} [images[].input.text.text] - text to render as a UTF-8 string. It can contain Pango markup, for example `<i>Le</i>Monde`.
- * @param {Number} [options.raw.width]
+ * @param {string} [images[].input.text.font] - font name to render with.
- * @param {Number} [options.raw.height]
+ * @param {string} [images[].input.text.fontfile] - absolute filesystem path to a font file that can be used by `font`.
- * @param {Number} [options.raw.channels]
+ * @param {number} [images[].input.text.width=0] - integral number of pixels to word-wrap at. Lines of text wider than this will be broken at word boundaries.
- * @param {Object} [options.create] - describes a blank overlay to be created.
+ * @param {number} [images[].input.text.height=0] - integral number of pixels high. When defined, `dpi` will be ignored and the text will automatically fit the pixel resolution defined by `width` and `height`. Will be ignored if `width` is not specified or set to 0.
- * @param {Number} [options.create.width]
+ * @param {string} [images[].input.text.align='left'] - text alignment (`'left'`, `'centre'`, `'center'`, `'right'`).
- * @param {Number} [options.create.height]
+ * @param {boolean} [images[].input.text.justify=false] - set this to true to apply justification to the text.
- * @param {Number} [options.create.channels] - 3-4
+ * @param {number} [images[].input.text.dpi=72] - the resolution (size) at which to render the text. Does not take effect if `height` is specified.
- * @param {String|Object} [options.create.background] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @param {boolean} [images[].input.text.rgba=false] - set this to true to enable RGBA output. This is useful for colour emoji rendering, or support for pango markup features like `<span foreground="red">Red!</span>`.
+ * @param {number} [images[].input.text.spacing=0] - text line height in points. Will use the font line height if none is specified.
+ * @param {String} [images[].blend='over'] - how to blend this image with the image below.
+ * @param {String} [images[].gravity='centre'] - gravity at which to place the overlay.
+ * @param {Number} [images[].top] - the pixel offset from the top edge.
+ * @param {Number} [images[].left] - the pixel offset from the left edge.
+ * @param {Boolean} [images[].tile=false] - set to true to repeat the overlay image across the entire image with the given `gravity`.
+ * @param {Boolean} [images[].premultiplied=false] - set to true to avoid premultipling the image below. Equivalent to the `--premultiplied` vips option.
+ * @param {Number} [images[].density=72] - number representing the DPI for vector overlay image.
+ * @param {Object} [images[].raw] - describes overlay when using raw pixel data.
+ * @param {Number} [images[].raw.width]
+ * @param {Number} [images[].raw.height]
+ * @param {Number} [images[].raw.channels]
+ * @param {boolean} [images[].animated=false] - Set to `true` to read all frames/pages of an animated image.
+ * @param {string} [images[].failOn='warning'] - @see {@link /api-constructor#parameters|constructor parameters}
+ * @param {number|boolean} [images[].limitInputPixels=268402689] - @see {@link /api-constructor#parameters|constructor parameters}
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
-function overlayWith (overlay, options) {
+function composite (images) {
-  this.options.overlay = this._createInputDescriptor(overlay, options, {
+  if (!Array.isArray(images)) {
-    allowStream: false
+    throw is.invalidParameterError('images to composite', 'array', images);
-  });
-  if (is.object(options)) {
-    if (is.defined(options.tile)) {
-      if (is.bool(options.tile)) {
-        this.options.overlayTile = options.tile;
-      } else {
-        throw new Error('Invalid overlay tile ' + options.tile);
-      }
-    }
-    if (is.defined(options.cutout)) {
-      if (is.bool(options.cutout)) {
-        this.options.overlayCutout = options.cutout;
-      } else {
-        throw new Error('Invalid overlay cutout ' + options.cutout);
-      }
-    }
-    if (is.defined(options.left) || is.defined(options.top)) {
-      if (is.integer(options.left) && options.left >= 0 && is.integer(options.top) && options.top >= 0) {
-        this.options.overlayXOffset = options.left;
-        this.options.overlayYOffset = options.top;
-      } else {
-        throw new Error('Invalid overlay left ' + options.left + ' and/or top ' + options.top);
-      }
-    }
-    if (is.defined(options.gravity)) {
-      if (is.integer(options.gravity) && is.inRange(options.gravity, 0, 8)) {
-        this.options.overlayGravity = options.gravity;
-      } else if (is.string(options.gravity) && is.integer(this.constructor.gravity[options.gravity])) {
-        this.options.overlayGravity = this.constructor.gravity[options.gravity];
-      } else {
-        throw new Error('Unsupported overlay gravity ' + options.gravity);
-      }
-    }
   }
+  this.options.composite = images.map(image => {
+    if (!is.object(image)) {
+      throw is.invalidParameterError('image to composite', 'object', image);
+    }
+    const inputOptions = this._inputOptionsFromObject(image);
+    const composite = {
+      input: this._createInputDescriptor(image.input, inputOptions, { allowStream: false }),
+      blend: 'over',
+      tile: false,
+      left: 0,
+      top: 0,
+      hasOffset: false,
+      gravity: 0,
+      premultiplied: false
+    };
+    if (is.defined(image.blend)) {
+      if (is.string(blend[image.blend])) {
+        composite.blend = blend[image.blend];
+      } else {
+        throw is.invalidParameterError('blend', 'valid blend name', image.blend);
+      }
+    }
+    if (is.defined(image.tile)) {
+      if (is.bool(image.tile)) {
+        composite.tile = image.tile;
+      } else {
+        throw is.invalidParameterError('tile', 'boolean', image.tile);
+      }
+    }
+    if (is.defined(image.left)) {
+      if (is.integer(image.left)) {
+        composite.left = image.left;
+      } else {
+        throw is.invalidParameterError('left', 'integer', image.left);
+      }
+    }
+    if (is.defined(image.top)) {
+      if (is.integer(image.top)) {
+        composite.top = image.top;
+      } else {
+        throw is.invalidParameterError('top', 'integer', image.top);
+      }
+    }
+    if (is.defined(image.top) !== is.defined(image.left)) {
+      throw new Error('Expected both left and top to be set');
+    } else {
+      composite.hasOffset = is.integer(image.top) && is.integer(image.left);
+    }
+    if (is.defined(image.gravity)) {
+      if (is.integer(image.gravity) && is.inRange(image.gravity, 0, 8)) {
+        composite.gravity = image.gravity;
+      } else if (is.string(image.gravity) && is.integer(this.constructor.gravity[image.gravity])) {
+        composite.gravity = this.constructor.gravity[image.gravity];
+      } else {
+        throw is.invalidParameterError('gravity', 'valid gravity', image.gravity);
+      }
+    }
+    if (is.defined(image.premultiplied)) {
+      if (is.bool(image.premultiplied)) {
+        composite.premultiplied = image.premultiplied;
+      } else {
+        throw is.invalidParameterError('premultiplied', 'boolean', image.premultiplied);
+      }
+    }
+    return composite;
+  });
   return this;
 }
 
@@ -92,5 +202,6 @@ function overlayWith (overlay, options) {
  * @private
  */
 module.exports = function (Sharp) {
-  Sharp.prototype.overlayWith = overlayWith;
+  Sharp.prototype.composite = composite;
+  Sharp.blend = blend;
 };

lib/constructor.js

@@ -1,59 +1,30 @@
 'use strict';
 
-const path = require('path');
 const util = require('util');
 const stream = require('stream');
-const events = require('events');
-const semver = require('semver');
 const is = require('./is');
-const platform = require('./platform');
-const sharp = require('../build/Release/sharp.node');
 
-// Vendor platform
+require('./libvips').hasVendoredLibvips();
-(function () {
+require('./sharp');
-  let vendorPlatformId;
-  try {
-    vendorPlatformId = require('../vendor/platform.json');
-  } catch (err) {
-    return;
-  }
-  const currentPlatformId = platform();
-  /* istanbul ignore if */
-  if (currentPlatformId !== vendorPlatformId) {
-    throw new Error(`'${vendorPlatformId}' binaries cannot be used on the '${currentPlatformId}' platform. Please remove the 'node_modules/sharp/vendor' directory and run 'npm rebuild'.`);
-  }
-})();
-
-// Versioning
-let versions = {
-  vips: sharp.libvipsVersion()
-};
-(function () {
-  // Does libvips meet minimum requirement?
-  const libvipsVersionMin = require('../package.json').config.libvips;
-  /* istanbul ignore if */
-  if (semver.lt(versions.vips, libvipsVersionMin)) {
-    throw new Error('Found libvips ' + versions.vips + ' but require at least ' + libvipsVersionMin);
-  }
-  // Include versions of dependencies, if present
-  try {
-    versions = require('../vendor/versions.json');
-  } catch (err) {}
-})();
 
 // Use NODE_DEBUG=sharp to enable libvips warnings
 const debuglog = util.debuglog('sharp');
 
 /**
- * @class Sharp
- *
  * Constructor factory to create an instance of `sharp`, to which further methods are chained.
  *
- * JPEG, PNG, WebP or TIFF format image data can be streamed out from this object.
+ * JPEG, PNG, WebP, GIF, AVIF or TIFF format image data can be streamed out from this object.
  * When using Stream based output, derived attributes are available from the `info` event.
  *
+ * Non-critical problems encountered during processing are emitted as `warning` events.
+ *
  * Implements the [stream.Duplex](http://nodejs.org/api/stream.html#stream_class_stream_duplex) class.
  *
+ * @constructs Sharp
+ *
+ * @emits Sharp#info
+ * @emits Sharp#warning
+ *
  * @example
  * sharp('input.jpg')
  *   .resize(300, 200)
@@ -88,25 +59,105 @@ const debuglog = util.debuglog('sharp');
  * .toBuffer()
  * .then( ... );
  *
- * @param {(Buffer|String)} [input] - if present, can be
+ * @example
- *  a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
+ * // Convert an animated GIF to an animated WebP
- *  a String containing the path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file.
+ * await sharp('in.gif', { animated: true }).toFile('out.webp');
- *  JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
+ *
+ * @example
+ * // Read a raw array of pixels and save it to a png
+ * const input = Uint8Array.from([255, 255, 255, 0, 0, 0]); // or Uint8ClampedArray
+ * const image = sharp(input, {
+ *   // because the input does not contain its dimensions or how many channels it has
+ *   // we need to specify it in the constructor options
+ *   raw: {
+ *     width: 2,
+ *     height: 1,
+ *     channels: 3
+ *   }
+ * });
+ * await image.toFile('my-two-pixels.png');
+ *
+ * @example
+ * // Generate RGB Gaussian noise
+ * await sharp({
+ *   create: {
+ *     width: 300,
+ *     height: 200,
+ *     channels: 3,
+ *     noise: {
+ *       type: 'gaussian',
+ *       mean: 128,
+ *       sigma: 30
+ *     }
+ *  }
+ * }).toFile('noise.png');
+ *
+ * @example
+ * // Generate an image from text
+ * await sharp({
+ *   text: {
+ *     text: 'Hello, world!',
+ *     width: 400, // max width
+ *     height: 300 // max height
+ *   }
+ * }).toFile('text_bw.png');
+ *
+ * @example
+ * // Generate an rgba image from text using pango markup and font
+ * await sharp({
+ *   text: {
+ *     text: '<span foreground="red">Red!</span><span background="cyan">blue</span>',
+ *     font: 'sans',
+ *     rgba: true,
+ *     dpi: 300
+ *   }
+ * }).toFile('text_rgba.png');
+ *
+ * @param {(Buffer|Uint8Array|Uint8ClampedArray|Int8Array|Uint16Array|Int16Array|Uint32Array|Int32Array|Float32Array|Float64Array|string)} [input] - if present, can be
+ *  a Buffer / Uint8Array / Uint8ClampedArray containing JPEG, PNG, WebP, AVIF, GIF, SVG or TIFF image data, or
+ *  a TypedArray containing raw pixel image data, or
+ *  a String containing the filesystem path to an JPEG, PNG, WebP, AVIF, GIF, SVG or TIFF image file.
+ *  JPEG, PNG, WebP, AVIF, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
  * @param {Object} [options] - if present, is an Object with optional attributes.
- * @param {Boolean} [options.failOnError=false] - by default apply a "best effort"
+ * @param {string} [options.failOn='warning'] - when to abort processing of invalid pixel data, one of (in order of sensitivity): 'none' (least), 'truncated', 'error' or 'warning' (most), highers level imply lower levels, invalid metadata will always abort.
- *  to decode images, even if the data is corrupt or invalid. Set this flag to true
+ * @param {number|boolean} [options.limitInputPixels=268402689] - Do not process input images where the number of pixels
- *  if you'd rather halt processing and raise an error when loading invalid images.
+ *  (width x height) exceeds this limit. Assumes image dimensions contained in the input metadata can be trusted.
- * @param {Number} [options.density=72] - integral number representing the DPI for vector images.
+ *  An integral Number of pixels, zero or false to remove limit, true to use default limit of 268402689 (0x3FFF x 0x3FFF).
- * @param {Number} [options.page=0] - page number to extract for multi-page input (GIF, TIFF)
+ * @param {boolean} [options.unlimited=false] - Set this to `true` to remove safety features that help prevent memory exhaustion (JPEG, PNG, SVG, HEIF).
+ * @param {boolean} [options.sequentialRead=false] - Set this to `true` to use sequential rather than random access where possible.
+ *  This can reduce memory usage and might improve performance on some systems.
+ * @param {number} [options.density=72] - number representing the DPI for vector images in the range 1 to 100000.
+ * @param {number} [options.pages=1] - number of pages to extract for multi-page input (GIF, WebP, AVIF, TIFF, PDF), use -1 for all pages.
+ * @param {number} [options.page=0] - page number to start extracting from for multi-page input (GIF, WebP, AVIF, TIFF, PDF), zero based.
+ * @param {number} [options.subifd=-1] - subIFD (Sub Image File Directory) to extract for OME-TIFF, defaults to main image.
+ * @param {number} [options.level=0] - level to extract from a multi-level input (OpenSlide), zero based.
+ * @param {boolean} [options.animated=false] - Set to `true` to read all frames/pages of an animated image (equivalent of setting `pages` to `-1`).
  * @param {Object} [options.raw] - describes raw pixel input image data. See `raw()` for pixel ordering.
- * @param {Number} [options.raw.width]
+ * @param {number} [options.raw.width] - integral number of pixels wide.
- * @param {Number} [options.raw.height]
+ * @param {number} [options.raw.height] - integral number of pixels high.
- * @param {Number} [options.raw.channels] - 1-4
+ * @param {number} [options.raw.channels] - integral number of channels, between 1 and 4.
+ * @param {boolean} [options.raw.premultiplied] - specifies that the raw input has already been premultiplied, set to `true`
+ *  to avoid sharp premultiplying the image. (optional, default `false`)
  * @param {Object} [options.create] - describes a new image to be created.
- * @param {Number} [options.create.width]
+ * @param {number} [options.create.width] - integral number of pixels wide.
- * @param {Number} [options.create.height]
+ * @param {number} [options.create.height] - integral number of pixels high.
- * @param {Number} [options.create.channels] - 3-4
+ * @param {number} [options.create.channels] - integral number of channels, either 3 (RGB) or 4 (RGBA).
- * @param {String|Object} [options.create.background] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @param {string|Object} [options.create.background] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @param {Object} [options.create.noise] - describes a noise to be created.
+ * @param {string} [options.create.noise.type] - type of generated noise, currently only `gaussian` is supported.
+ * @param {number} [options.create.noise.mean] - mean of pixels in generated noise.
+ * @param {number} [options.create.noise.sigma] - standard deviation of pixels in generated noise.
+ * @param {Object} [options.text] - describes a new text image to be created.
+ * @param {string} [options.text.text] - text to render as a UTF-8 string. It can contain Pango markup, for example `<i>Le</i>Monde`.
+ * @param {string} [options.text.font] - font name to render with.
+ * @param {string} [options.text.fontfile] - absolute filesystem path to a font file that can be used by `font`.
+ * @param {number} [options.text.width=0] - integral number of pixels to word-wrap at. Lines of text wider than this will be broken at word boundaries.
+ * @param {number} [options.text.height=0] - integral number of pixels high. When defined, `dpi` will be ignored and the text will automatically fit the pixel resolution defined by `width` and `height`. Will be ignored if `width` is not specified or set to 0.
+ * @param {string} [options.text.align='left'] - text alignment (`'left'`, `'centre'`, `'center'`, `'right'`).
+ * @param {boolean} [options.text.justify=false] - set this to true to apply justification to the text.
+ * @param {number} [options.text.dpi=72] - the resolution (size) at which to render the text. Does not take effect if `height` is specified.
+ * @param {boolean} [options.text.rgba=false] - set this to true to enable RGBA output. This is useful for colour emoji rendering, or support for pango markup features like `<span foreground="red">Red!</span>`.
+ * @param {number} [options.text.spacing=0] - text line height in points. Will use the font line height if none is specified.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -119,11 +170,6 @@ const Sharp = function (input, options) {
   }
   stream.Duplex.call(this);
   this.options = {
-    // input options
-    sequentialRead: false,
-    limitInputPixels: Math.pow(0x3FFF, 2),
-    // ICC profiles
-    iccProfilePath: path.join(__dirname, 'icc') + path.sep,
     // resize options
     topOffsetPre: -1,
     leftOffsetPre: -1,
@@ -136,10 +182,12 @@ const Sharp = function (input, options) {
     width: -1,
     height: -1,
     canvas: 'crop',
-    crop: 0,
+    position: 0,
-    embed: 0,
+    resizeBackground: [0, 0, 0, 255],
     useExifOrientation: false,
     angle: 0,
+    rotationAngle: 0,
+    rotationBackground: [0, 0, 0, 255],
     rotateBeforePreExtract: false,
     flip: false,
     flop: false,
@@ -147,44 +195,66 @@ const Sharp = function (input, options) {
     extendBottom: 0,
     extendLeft: 0,
     extendRight: 0,
+    extendBackground: [0, 0, 0, 255],
     withoutEnlargement: false,
+    withoutReduction: false,
+    affineMatrix: [],
+    affineBackground: [0, 0, 0, 255],
+    affineIdx: 0,
+    affineIdy: 0,
+    affineOdx: 0,
+    affineOdy: 0,
+    affineInterpolator: this.constructor.interpolators.bilinear,
     kernel: 'lanczos3',
     fastShrinkOnLoad: true,
     // operations
-    background: [0, 0, 0, 255],
     tintA: 128,
     tintB: 128,
     flatten: false,
+    flattenBackground: [0, 0, 0],
     negate: false,
+    negateAlpha: true,
     medianSize: 0,
     blurSigma: 0,
     sharpenSigma: 0,
-    sharpenFlat: 1,
+    sharpenM1: 1,
-    sharpenJagged: 2,
+    sharpenM2: 2,
+    sharpenX1: 2,
+    sharpenY2: 10,
+    sharpenY3: 20,
     threshold: 0,
     thresholdGrayscale: true,
-    trimTolerance: 0,
+    trimBackground: [],
+    trimThreshold: 0,
     gamma: 0,
+    gammaOut: 0,
     greyscale: false,
-    normalise: 0,
+    normalise: false,
+    claheWidth: 0,
+    claheHeight: 0,
+    claheMaxSlope: 3,
+    brightness: 1,
+    saturation: 1,
+    hue: 0,
+    lightness: 0,
     booleanBufferIn: null,
     booleanFileIn: '',
     joinChannelIn: [],
     extractChannel: -1,
     removeAlpha: false,
+    ensureAlpha: -1,
     colourspace: 'srgb',
-    // overlay
+    colourspaceInput: 'last',
-    overlayGravity: 0,
+    composite: [],
-    overlayXOffset: -1,
-    overlayYOffset: -1,
-    overlayTile: false,
-    overlayCutout: false,
     // output
     fileOut: '',
     formatOut: 'input',
     streamOut: false,
     withMetadata: false,
     withMetadataOrientation: -1,
+    withMetadataDensity: 0,
+    withMetadataIcc: '',
+    withMetadataStrs: {},
     resolveWithObject: false,
     // output format
     jpegQuality: 80,
@@ -196,62 +266,161 @@ const Sharp = function (input, options) {
     jpegOptimiseCoding: true,
     jpegQuantisationTable: 0,
     pngProgressive: false,
-    pngCompressionLevel: 9,
+    pngCompressionLevel: 6,
     pngAdaptiveFiltering: false,
+    pngPalette: false,
+    pngQuality: 100,
+    pngEffort: 7,
+    pngBitdepth: 8,
+    pngDither: 1,
+    jp2Quality: 80,
+    jp2TileHeight: 512,
+    jp2TileWidth: 512,
+    jp2Lossless: false,
+    jp2ChromaSubsampling: '4:4:4',
     webpQuality: 80,
     webpAlphaQuality: 100,
     webpLossless: false,
     webpNearLossless: false,
+    webpSmartSubsample: false,
+    webpEffort: 4,
+    webpMinSize: false,
+    webpMixed: false,
+    gifBitdepth: 8,
+    gifEffort: 7,
+    gifDither: 1,
+    gifInterFrameMaxError: 0,
+    gifInterPaletteMaxError: 3,
+    gifReoptimise: false,
     tiffQuality: 80,
     tiffCompression: 'jpeg',
     tiffPredictor: 'horizontal',
-    tiffSquash: false,
+    tiffPyramid: false,
+    tiffBitdepth: 8,
+    tiffTile: false,
+    tiffTileHeight: 256,
+    tiffTileWidth: 256,
     tiffXres: 1.0,
     tiffYres: 1.0,
+    tiffResolutionUnit: 'inch',
+    heifQuality: 50,
+    heifLossless: false,
+    heifCompression: 'av1',
+    heifEffort: 4,
+    heifChromaSubsampling: '4:4:4',
+    jxlDistance: 1,
+    jxlDecodingTier: 0,
+    jxlEffort: 7,
+    jxlLossless: false,
+    rawDepth: 'uchar',
     tileSize: 256,
     tileOverlap: 0,
-    linearA: 1,
+    tileContainer: 'fs',
-    linearB: 0,
+    tileLayout: 'dz',
+    tileFormat: 'last',
+    tileDepth: 'last',
+    tileAngle: 0,
+    tileSkipBlanks: -1,
+    tileBackground: [255, 255, 255, 255],
+    tileCentre: false,
+    tileId: 'https://example.com/iiif',
+    tileBasename: '',
+    timeoutSeconds: 0,
+    linearA: [],
+    linearB: [],
     // Function to notify of libvips warnings
-    debuglog: debuglog,
+    debuglog: warning => {
+      this.emit('warning', warning);
+      debuglog(warning);
+    },
     // Function to notify of queue length changes
     queueListener: function (queueLength) {
-      queue.emit('change', queueLength);
+      Sharp.queue.emit('change', queueLength);
     }
   };
   this.options.input = this._createInputDescriptor(input, options, { allowStream: true });
   return this;
 };
-util.inherits(Sharp, stream.Duplex);
+Object.setPrototypeOf(Sharp.prototype, stream.Duplex.prototype);
+Object.setPrototypeOf(Sharp, stream.Duplex);
 
 /**
- * An EventEmitter that emits a `change` event when a task is either:
+ * Take a "snapshot" of the Sharp instance, returning a new instance.
- * - queued, waiting for _libuv_ to provide a worker thread
+ * Cloned instances inherit the input of their parent instance.
- * - complete
+ * This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream.
- * @member
+ *
  * @example
- * sharp.queue.on('change', function(queueLength) {
+ * const pipeline = sharp().rotate();
- *   console.log('Queue contains ' + queueLength + ' task(s)');
+ * pipeline.clone().resize(800, 600).pipe(firstWritableStream);
- * });
+ * pipeline.clone().extract({ left: 20, top: 20, width: 100, height: 100 }).pipe(secondWritableStream);
- */
+ * readableStream.pipe(pipeline);
-const queue = new events.EventEmitter();
+ * // firstWritableStream receives auto-rotated, resized readableStream
-Sharp.queue = queue;
+ * // secondWritableStream receives auto-rotated, extracted region of readableStream
-
+ *
-/**
- * An Object containing nested boolean values representing the available input and output formats/methods.
  * @example
- * console.log(sharp.format);
+ * // Create a pipeline that will download an image, resize it and format it to different files
- * @returns {Object}
+ * // Using Promises to know when the pipeline is complete
+ * const fs = require("fs");
+ * const got = require("got");
+ * const sharpStream = sharp({ failOn: 'none' });
+ *
+ * const promises = [];
+ *
+ * promises.push(
+ *   sharpStream
+ *     .clone()
+ *     .jpeg({ quality: 100 })
+ *     .toFile("originalFile.jpg")
+ * );
+ *
+ * promises.push(
+ *   sharpStream
+ *     .clone()
+ *     .resize({ width: 500 })
+ *     .jpeg({ quality: 80 })
+ *     .toFile("optimized-500.jpg")
+ * );
+ *
+ * promises.push(
+ *   sharpStream
+ *     .clone()
+ *     .resize({ width: 500 })
+ *     .webp({ quality: 80 })
+ *     .toFile("optimized-500.webp")
+ * );
+ *
+ * // https://github.com/sindresorhus/got/blob/main/documentation/3-streams.md
+ * got.stream("https://www.example.com/some-file.jpg").pipe(sharpStream);
+ *
+ * Promise.all(promises)
+ *   .then(res => { console.log("Done!", res); })
+ *   .catch(err => {
+ *     console.error("Error processing files, let's clean it up", err);
+ *     try {
+ *       fs.unlinkSync("originalFile.jpg");
+ *       fs.unlinkSync("optimized-500.jpg");
+ *       fs.unlinkSync("optimized-500.webp");
+ *     } catch (e) {}
+ *   });
+ *
+ * @returns {Sharp}
  */
-Sharp.format = sharp.format();
+function clone () {
-
+  // Clone existing options
-/**
+  const clone = this.constructor.call();
- * An Object containing the version numbers of libvips and its dependencies.
+  clone.options = Object.assign({}, this.options);
- * @member
+  // Pass 'finish' event to clone for Stream-based input
- * @example
+  if (this._isStreamInput()) {
- * console.log(sharp.versions);
+    this.on('finish', () => {
- */
+      // Clone inherits input data
-Sharp.versions = versions;
+      this._flattenBufferIn();
+      clone.options.bufferIn = this.options.bufferIn;
+      clone.emit('finish');
+    });
+  }
+  return clone;
+}
+Object.assign(Sharp.prototype, { clone });
 
 /**
  * Export constructor.

lib/input.js

@@ -2,44 +2,122 @@
 
 const color = require('color');
 const is = require('./is');
-const sharp = require('../build/Release/sharp.node');
+const sharp = require('./sharp');
+
+/**
+ * Justication alignment
+ * @member
+ * @private
+ */
+const align = {
+  left: 'low',
+  center: 'centre',
+  centre: 'centre',
+  right: 'high'
+};
+
+/**
+ * Extract input options, if any, from an object.
+ * @private
+ */
+function _inputOptionsFromObject (obj) {
+  const { raw, density, limitInputPixels, unlimited, sequentialRead, failOn, failOnError, animated, page, pages, subifd } = obj;
+  return [raw, density, limitInputPixels, unlimited, sequentialRead, failOn, failOnError, animated, page, pages, subifd].some(is.defined)
+    ? { raw, density, limitInputPixels, unlimited, sequentialRead, failOn, failOnError, animated, page, pages, subifd }
+    : undefined;
+}
 
 /**
  * Create Object containing input and input-related options.
  * @private
  */
 function _createInputDescriptor (input, inputOptions, containerOptions) {
-  const inputDescriptor = { failOnError: false };
+  const inputDescriptor = {
+    failOn: 'warning',
+    limitInputPixels: Math.pow(0x3FFF, 2),
+    unlimited: false,
+    sequentialRead: false
+  };
   if (is.string(input)) {
     // filesystem
     inputDescriptor.file = input;
   } else if (is.buffer(input)) {
     // Buffer
+    if (input.length === 0) {
+      throw Error('Input Buffer is empty');
+    }
     inputDescriptor.buffer = input;
+  } else if (is.typedArray(input)) {
+    if (input.length === 0) {
+      throw Error('Input Bit Array is empty');
+    }
+    inputDescriptor.buffer = Buffer.from(input.buffer, input.byteOffset, input.byteLength);
   } else if (is.plainObject(input) && !is.defined(inputOptions)) {
     // Plain Object descriptor, e.g. create
     inputOptions = input;
-  } else if (!is.defined(input) && is.object(containerOptions) && containerOptions.allowStream) {
+    if (_inputOptionsFromObject(inputOptions)) {
-    // Stream
+      // Stream with options
+      inputDescriptor.buffer = [];
+    }
+  } else if (!is.defined(input) && !is.defined(inputOptions) && is.object(containerOptions) && containerOptions.allowStream) {
+    // Stream without options
     inputDescriptor.buffer = [];
   } else {
-    throw new Error('Unsupported input ' + typeof input);
+    throw new Error(`Unsupported input '${input}' of type ${typeof input}${
+      is.defined(inputOptions) ? ` when also providing options of type ${typeof inputOptions}` : ''
+    }`);
   }
   if (is.object(inputOptions)) {
-    // Fail on error
+    // Deprecated: failOnError
     if (is.defined(inputOptions.failOnError)) {
       if (is.bool(inputOptions.failOnError)) {
-        inputDescriptor.failOnError = inputOptions.failOnError;
+        inputDescriptor.failOn = inputOptions.failOnError ? 'warning' : 'none';
       } else {
-        throw new Error('Invalid failOnError (boolean) ' + inputOptions.failOnError);
+        throw is.invalidParameterError('failOnError', 'boolean', inputOptions.failOnError);
+      }
+    }
+    // failOn
+    if (is.defined(inputOptions.failOn)) {
+      if (is.string(inputOptions.failOn) && is.inArray(inputOptions.failOn, ['none', 'truncated', 'error', 'warning'])) {
+        inputDescriptor.failOn = inputOptions.failOn;
+      } else {
+        throw is.invalidParameterError('failOn', 'one of: none, truncated, error, warning', inputOptions.failOn);
       }
     }
     // Density
     if (is.defined(inputOptions.density)) {
-      if (is.integer(inputOptions.density) && is.inRange(inputOptions.density, 1, 2400)) {
+      if (is.inRange(inputOptions.density, 1, 100000)) {
         inputDescriptor.density = inputOptions.density;
       } else {
-        throw new Error('Invalid density (1 to 2400) ' + inputOptions.density);
+        throw is.invalidParameterError('density', 'number between 1 and 100000', inputOptions.density);
+      }
+    }
+    // limitInputPixels
+    if (is.defined(inputOptions.limitInputPixels)) {
+      if (is.bool(inputOptions.limitInputPixels)) {
+        inputDescriptor.limitInputPixels = inputOptions.limitInputPixels
+          ? Math.pow(0x3FFF, 2)
+          : 0;
+      } else if (is.integer(inputOptions.limitInputPixels) && is.inRange(inputOptions.limitInputPixels, 0, Number.MAX_SAFE_INTEGER)) {
+        inputDescriptor.limitInputPixels = inputOptions.limitInputPixels;
+      } else {
+        throw is.invalidParameterError('limitInputPixels', 'positive integer', inputOptions.limitInputPixels);
+      }
+    }
+    // unlimited
+    if (is.defined(inputOptions.unlimited)) {
+      if (is.bool(inputOptions.unlimited)) {
+        inputDescriptor.unlimited = inputOptions.unlimited;
+      } else {
+        throw is.invalidParameterError('unlimited', 'boolean', inputOptions.unlimited);
+      }
+    }
+    // sequentialRead
+    if (is.defined(inputOptions.sequentialRead)) {
+      if (is.bool(inputOptions.sequentialRead)) {
+        inputDescriptor.sequentialRead = inputOptions.sequentialRead;
+      } else {
+        throw is.invalidParameterError('sequentialRead', 'boolean', inputOptions.sequentialRead);
       }
     }
     // Raw pixel input
@@ -53,14 +131,78 @@ function _createInputDescriptor (input, inputOptions, containerOptions) {
         inputDescriptor.rawWidth = inputOptions.raw.width;
         inputDescriptor.rawHeight = inputOptions.raw.height;
         inputDescriptor.rawChannels = inputOptions.raw.channels;
+        inputDescriptor.rawPremultiplied = !!inputOptions.raw.premultiplied;
+
+        switch (input.constructor) {
+          case Uint8Array:
+          case Uint8ClampedArray:
+            inputDescriptor.rawDepth = 'uchar';
+            break;
+          case Int8Array:
+            inputDescriptor.rawDepth = 'char';
+            break;
+          case Uint16Array:
+            inputDescriptor.rawDepth = 'ushort';
+            break;
+          case Int16Array:
+            inputDescriptor.rawDepth = 'short';
+            break;
+          case Uint32Array:
+            inputDescriptor.rawDepth = 'uint';
+            break;
+          case Int32Array:
+            inputDescriptor.rawDepth = 'int';
+            break;
+          case Float32Array:
+            inputDescriptor.rawDepth = 'float';
+            break;
+          case Float64Array:
+            inputDescriptor.rawDepth = 'double';
+            break;
+          default:
+            inputDescriptor.rawDepth = 'uchar';
+            break;
+        }
       } else {
         throw new Error('Expected width, height and channels for raw pixel input');
       }
     }
-    // Page input for multi-page TIFF
+    // Multi-page input (GIF, TIFF, PDF)
+    if (is.defined(inputOptions.animated)) {
+      if (is.bool(inputOptions.animated)) {
+        inputDescriptor.pages = inputOptions.animated ? -1 : 1;
+      } else {
+        throw is.invalidParameterError('animated', 'boolean', inputOptions.animated);
+      }
+    }
+    if (is.defined(inputOptions.pages)) {
+      if (is.integer(inputOptions.pages) && is.inRange(inputOptions.pages, -1, 100000)) {
+        inputDescriptor.pages = inputOptions.pages;
+      } else {
+        throw is.invalidParameterError('pages', 'integer between -1 and 100000', inputOptions.pages);
+      }
+    }
     if (is.defined(inputOptions.page)) {
       if (is.integer(inputOptions.page) && is.inRange(inputOptions.page, 0, 100000)) {
         inputDescriptor.page = inputOptions.page;
+      } else {
+        throw is.invalidParameterError('page', 'integer between 0 and 100000', inputOptions.page);
+      }
+    }
+    // Multi-level input (OpenSlide)
+    if (is.defined(inputOptions.level)) {
+      if (is.integer(inputOptions.level) && is.inRange(inputOptions.level, 0, 256)) {
+        inputDescriptor.level = inputOptions.level;
+      } else {
+        throw is.invalidParameterError('level', 'integer between 0 and 256', inputOptions.level);
+      }
+    }
+    // Sub Image File Directory (TIFF)
+    if (is.defined(inputOptions.subifd)) {
+      if (is.integer(inputOptions.subifd) && is.inRange(inputOptions.subifd, -1, 100000)) {
+        inputDescriptor.subifd = inputOptions.subifd;
+      } else {
+        throw is.invalidParameterError('subifd', 'integer between -1 and 100000', inputOptions.subifd);
       }
     }
     // Create new image
@@ -69,22 +211,125 @@ function _createInputDescriptor (input, inputOptions, containerOptions) {
         is.object(inputOptions.create) &&
         is.integer(inputOptions.create.width) && inputOptions.create.width > 0 &&
         is.integer(inputOptions.create.height) && inputOptions.create.height > 0 &&
-        is.integer(inputOptions.create.channels) && is.inRange(inputOptions.create.channels, 3, 4) &&
+        is.integer(inputOptions.create.channels)
-        is.defined(inputOptions.create.background)
       ) {
         inputDescriptor.createWidth = inputOptions.create.width;
         inputDescriptor.createHeight = inputOptions.create.height;
         inputDescriptor.createChannels = inputOptions.create.channels;
-        const background = color(inputOptions.create.background);
+        // Noise
-        inputDescriptor.createBackground = [
+        if (is.defined(inputOptions.create.noise)) {
-          background.red(),
+          if (!is.object(inputOptions.create.noise)) {
-          background.green(),
+            throw new Error('Expected noise to be an object');
-          background.blue(),
+          }
-          Math.round(background.alpha() * 255)
+          if (!is.inArray(inputOptions.create.noise.type, ['gaussian'])) {
-        ];
+            throw new Error('Only gaussian noise is supported at the moment');
+          }
+          if (!is.inRange(inputOptions.create.channels, 1, 4)) {
+            throw is.invalidParameterError('create.channels', 'number between 1 and 4', inputOptions.create.channels);
+          }
+          inputDescriptor.createNoiseType = inputOptions.create.noise.type;
+          if (is.number(inputOptions.create.noise.mean) && is.inRange(inputOptions.create.noise.mean, 0, 10000)) {
+            inputDescriptor.createNoiseMean = inputOptions.create.noise.mean;
+          } else {
+            throw is.invalidParameterError('create.noise.mean', 'number between 0 and 10000', inputOptions.create.noise.mean);
+          }
+          if (is.number(inputOptions.create.noise.sigma) && is.inRange(inputOptions.create.noise.sigma, 0, 10000)) {
+            inputDescriptor.createNoiseSigma = inputOptions.create.noise.sigma;
+          } else {
+            throw is.invalidParameterError('create.noise.sigma', 'number between 0 and 10000', inputOptions.create.noise.sigma);
+          }
+        } else if (is.defined(inputOptions.create.background)) {
+          if (!is.inRange(inputOptions.create.channels, 3, 4)) {
+            throw is.invalidParameterError('create.channels', 'number between 3 and 4', inputOptions.create.channels);
+          }
+          const background = color(inputOptions.create.background);
+          inputDescriptor.createBackground = [
+            background.red(),
+            background.green(),
+            background.blue(),
+            Math.round(background.alpha() * 255)
+          ];
+        } else {
+          throw new Error('Expected valid noise or background to create a new input image');
+        }
         delete inputDescriptor.buffer;
       } else {
-        throw new Error('Expected width, height, channels and background to create a new input image');
+        throw new Error('Expected valid width, height and channels to create a new input image');
+      }
+    }
+    // Create a new image with text
+    if (is.defined(inputOptions.text)) {
+      if (is.object(inputOptions.text) && is.string(inputOptions.text.text)) {
+        inputDescriptor.textValue = inputOptions.text.text;
+        if (is.defined(inputOptions.text.height) && is.defined(inputOptions.text.dpi)) {
+          throw new Error('Expected only one of dpi or height');
+        }
+        if (is.defined(inputOptions.text.font)) {
+          if (is.string(inputOptions.text.font)) {
+            inputDescriptor.textFont = inputOptions.text.font;
+          } else {
+            throw is.invalidParameterError('text.font', 'string', inputOptions.text.font);
+          }
+        }
+        if (is.defined(inputOptions.text.fontfile)) {
+          if (is.string(inputOptions.text.fontfile)) {
+            inputDescriptor.textFontfile = inputOptions.text.fontfile;
+          } else {
+            throw is.invalidParameterError('text.fontfile', 'string', inputOptions.text.fontfile);
+          }
+        }
+        if (is.defined(inputOptions.text.width)) {
+          if (is.number(inputOptions.text.width)) {
+            inputDescriptor.textWidth = inputOptions.text.width;
+          } else {
+            throw is.invalidParameterError('text.textWidth', 'number', inputOptions.text.width);
+          }
+        }
+        if (is.defined(inputOptions.text.height)) {
+          if (is.number(inputOptions.text.height)) {
+            inputDescriptor.textHeight = inputOptions.text.height;
+          } else {
+            throw is.invalidParameterError('text.height', 'number', inputOptions.text.height);
+          }
+        }
+        if (is.defined(inputOptions.text.align)) {
+          if (is.string(inputOptions.text.align) && is.string(this.constructor.align[inputOptions.text.align])) {
+            inputDescriptor.textAlign = this.constructor.align[inputOptions.text.align];
+          } else {
+            throw is.invalidParameterError('text.align', 'valid alignment', inputOptions.text.align);
+          }
+        }
+        if (is.defined(inputOptions.text.justify)) {
+          if (is.bool(inputOptions.text.justify)) {
+            inputDescriptor.textJustify = inputOptions.text.justify;
+          } else {
+            throw is.invalidParameterError('text.justify', 'boolean', inputOptions.text.justify);
+          }
+        }
+        if (is.defined(inputOptions.text.dpi)) {
+          if (is.number(inputOptions.text.dpi) && is.inRange(inputOptions.text.dpi, 1, 100000)) {
+            inputDescriptor.textDpi = inputOptions.text.dpi;
+          } else {
+            throw is.invalidParameterError('text.dpi', 'number between 1 and 100000', inputOptions.text.dpi);
+          }
+        }
+        if (is.defined(inputOptions.text.rgba)) {
+          if (is.bool(inputOptions.text.rgba)) {
+            inputDescriptor.textRgba = inputOptions.text.rgba;
+          } else {
+            throw is.invalidParameterError('text.rgba', 'bool', inputOptions.text.rgba);
+          }
+        }
+        if (is.defined(inputOptions.text.spacing)) {
+          if (is.number(inputOptions.text.spacing)) {
+            inputDescriptor.textSpacing = inputOptions.text.spacing;
+          } else {
+            throw is.invalidParameterError('text.spacing', 'number', inputOptions.text.spacing);
+          }
+        }
+        delete inputDescriptor.buffer;
+      } else {
+        throw new Error('Expected a valid string to create an image with text.');
       }
     }
   } else if (is.defined(inputOptions)) {
@@ -97,7 +342,7 @@ function _createInputDescriptor (input, inputOptions, containerOptions) {
  * Handle incoming Buffer chunk on Writable Stream.
  * @private
  * @param {Buffer} chunk
- * @param {String} encoding - unused
+ * @param {string} encoding - unused
  * @param {Function} callback
  */
 function _write (chunk, encoding, callback) {
@@ -106,9 +351,8 @@ function _write (chunk, encoding, callback) {
     /* istanbul ignore else */
     if (is.buffer(chunk)) {
       if (this.options.input.buffer.length === 0) {
-        const that = this;
+        this.on('finish', () => {
-        this.on('finish', function () {
+          this.streamInFinished = true;
-          that.streamInFinished = true;
         });
       }
       this.options.input.buffer.push(chunk);
@@ -134,55 +378,43 @@ function _flattenBufferIn () {
 /**
  * Are we expecting Stream-based input?
  * @private
- * @returns {Boolean}
+ * @returns {boolean}
  */
 function _isStreamInput () {
   return Array.isArray(this.options.input.buffer);
 }
 
 /**
- * Take a "snapshot" of the Sharp instance, returning a new instance.
+ * Fast access to (uncached) image metadata without decoding any compressed pixel data.
- * Cloned instances inherit the input of their parent instance.
- * This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream.
  *
- * @example
+ * This is taken from the header of the input image.
- * const pipeline = sharp().rotate();
+ * It does not include operations, such as resize, to be applied to the output image.
- * pipeline.clone().resize(800, 600).pipe(firstWritableStream);
- * pipeline.clone().extract({ left: 20, top: 20, width: 100, height: 100 }).pipe(secondWritableStream);
- * readableStream.pipe(pipeline);
- * // firstWritableStream receives auto-rotated, resized readableStream
- * // secondWritableStream receives auto-rotated, extracted region of readableStream
  *
- * @returns {Sharp}
+ * Dimensions in the response will respect the `page` and `pages` properties of the
- */
+ * {@link /api-constructor#parameters|constructor parameters}.
-function clone () {
+ *
-  const that = this;
+ * A `Promise` is returned when `callback` is not provided.
-  // Clone existing options
-  const clone = this.constructor.call();
-  clone.options = Object.assign({}, this.options);
-  // Pass 'finish' event to clone for Stream-based input
-  if (this._isStreamInput()) {
-    this.on('finish', function () {
-      // Clone inherits input data
-      that._flattenBufferIn();
-      clone.options.bufferIn = that.options.bufferIn;
-      clone.emit('finish');
-    });
-  }
-  return clone;
-}
-
-/**
- * Fast access to (uncached) image metadata without decoding any compressed image data.
- * A Promises/A+ promise is returned when `callback` is not provided.
  *
  * - `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
- * - `width`: Number of pixels wide (EXIF orientation is not taken into consideration)
+ * - `size`: Total size of image in bytes, for Stream and Buffer input only
- * - `height`: Number of pixels high (EXIF orientation is not taken into consideration)
+ * - `width`: Number of pixels wide (EXIF orientation is not taken into consideration, see example below)
- * - `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L636)
+ * - `height`: Number of pixels high (EXIF orientation is not taken into consideration, see example below)
+ * - `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://www.libvips.org/API/current/VipsImage.html#VipsInterpretation)
  * - `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
- * - `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L672)
+ * - `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...](https://www.libvips.org/API/current/VipsImage.html#VipsBandFormat)
  * - `density`: Number of pixels per inch (DPI), if present
+ * - `chromaSubsampling`: String containing JPEG chroma subsampling, `4:2:0` or `4:4:4` for RGB, `4:2:0:4` or `4:4:4:4` for CMYK
+ * - `isProgressive`: Boolean indicating whether the image is interlaced using a progressive scan
+ * - `pages`: Number of pages/frames contained within the image, with support for TIFF, HEIF, PDF, animated GIF and animated WebP
+ * - `pageHeight`: Number of pixels high each page in a multi-page image will be.
+ * - `loop`: Number of times to loop an animated image, zero refers to a continuous loop.
+ * - `delay`: Delay in ms between each page in an animated image, provided as an array of integers.
+ * - `pagePrimary`: Number of the primary page in a HEIF image
+ * - `levels`: Details of each level in a multi-level image provided as an array of objects, requires libvips compiled with support for OpenSlide
+ * - `subifds`: Number of Sub Image File Directories in an OME-TIFF image
+ * - `background`: Default background colour, if present, for PNG (bKGD) and GIF images, either an RGB Object or a single greyscale value
+ * - `compression`: The encoder used to compress an HEIF file, `av1` (AVIF) or `hevc` (HEIC)
+ * - `resolutionUnit`: The unit of resolution (density), either `inch` or `cm`, if present
  * - `hasProfile`: Boolean indicating the presence of an embedded ICC profile
  * - `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
  * - `orientation`: Number value of the EXIF Orientation header, if present
@@ -190,6 +422,10 @@ function clone () {
  * - `icc`: Buffer containing raw [ICC](https://www.npmjs.com/package/icc) profile data, if present
  * - `iptc`: Buffer containing raw IPTC data, if present
  * - `xmp`: Buffer containing raw XMP data, if present
+ * - `tifftagPhotoshop`: Buffer containing raw TIFFTAG_PHOTOSHOP data, if present
+ *
+ * @example
+ * const metadata = await sharp(input).metadata();
  *
  * @example
  * const image = sharp(inputJpg);
@@ -205,16 +441,26 @@ function clone () {
  *     // data contains a WebP image half the width and height of the original JPEG
  *   });
  *
+ * @example
+ * // Based on EXIF rotation metadata, get the right-side-up width and height:
+ *
+ * const size = getNormalSize(await sharp(input).metadata());
+ *
+ * function getNormalSize({ width, height, orientation }) {
+ *   return (orientation || 0) >= 5
+ *     ? { width: height, height: width }
+ *     : { width, height };
+ * }
+ *
  * @param {Function} [callback] - called with the arguments `(err, metadata)`
  * @returns {Promise<Object>|Sharp}
  */
 function metadata (callback) {
-  const that = this;
   if (is.fn(callback)) {
     if (this._isStreamInput()) {
-      this.on('finish', function () {
+      this.on('finish', () => {
-        that._flattenBufferIn();
+        this._flattenBufferIn();
-        sharp.metadata(that.options, callback);
+        sharp.metadata(this.options, callback);
       });
     } else {
       sharp.metadata(this.options, callback);
@@ -222,21 +468,26 @@ function metadata (callback) {
     return this;
   } else {
     if (this._isStreamInput()) {
-      return new Promise(function (resolve, reject) {
+      return new Promise((resolve, reject) => {
-        that.on('finish', function () {
+        const finished = () => {
-          that._flattenBufferIn();
+          this._flattenBufferIn();
-          sharp.metadata(that.options, function (err, metadata) {
+          sharp.metadata(this.options, (err, metadata) => {
             if (err) {
               reject(err);
             } else {
               resolve(metadata);
             }
           });
-        });
+        };
+        if (this.writableFinished) {
+          finished();
+        } else {
+          this.once('finish', finished);
+        }
       });
     } else {
-      return new Promise(function (resolve, reject) {
+      return new Promise((resolve, reject) => {
-        sharp.metadata(that.options, function (err, metadata) {
+        sharp.metadata(this.options, (err, metadata) => {
           if (err) {
             reject(err);
           } else {
@@ -250,7 +501,7 @@ function metadata (callback) {
 
 /**
  * Access to pixel-derived image statistics for every channel in the image.
- * A Promise is returned when `callback` is not provided.
+ * A `Promise` is returned when `callback` is not provided.
  *
  * - `channels`: Array of channel statistics for each channel in the image. Each channel statistic contains
  *     - `min` (minimum value in the channel)
@@ -263,8 +514,13 @@ function metadata (callback) {
  *     - `minY` (y-coordinate of one of the pixel where the minimum lies)
  *     - `maxX` (x-coordinate of one of the pixel where the maximum lies)
  *     - `maxY` (y-coordinate of one of the pixel where the maximum lies)
- * - `isOpaque`: Value to identify if the image is opaque or transparent, based on the presence and use of alpha channel
+ * - `isOpaque`: Is the image fully opaque? Will be `true` if the image has no alpha channel or if every pixel is fully opaque.
- * - `entropy`: Histogram-based estimation of greyscale entropy, discarding alpha channel if any (experimental)
+ * - `entropy`: Histogram-based estimation of greyscale entropy, discarding alpha channel if any.
+ * - `sharpness`: Estimation of greyscale sharpness based on the standard deviation of a Laplacian convolution, discarding alpha channel if any.
+ * - `dominant`: Object containing most dominant sRGB colour based on a 4096-bin 3D histogram.
+ *
+ * **Note**: Statistics are derived from the original input image. Any operations performed on the image must first be
+ * written to a buffer in order to run `stats` on the result (see third example).
  *
  * @example
  * const image = sharp(inputJpg);
@@ -274,16 +530,26 @@ function metadata (callback) {
  *      // stats contains the channel-wise statistics array and the isOpaque value
  *   });
  *
+ * @example
+ * const { entropy, sharpness, dominant } = await sharp(input).stats();
+ * const { r, g, b } = dominant;
+ *
+ * @example
+ * const image = sharp(input);
+ * // store intermediate result
+ * const part = await image.extract(region).toBuffer();
+ * // create new instance to obtain statistics of extracted region
+ * const stats = await sharp(part).stats();
+ *
  * @param {Function} [callback] - called with the arguments `(err, stats)`
  * @returns {Promise<Object>}
  */
 function stats (callback) {
-  const that = this;
   if (is.fn(callback)) {
     if (this._isStreamInput()) {
-      this.on('finish', function () {
+      this.on('finish', () => {
-        that._flattenBufferIn();
+        this._flattenBufferIn();
-        sharp.stats(that.options, callback);
+        sharp.stats(this.options, callback);
       });
     } else {
       sharp.stats(this.options, callback);
@@ -291,10 +557,10 @@ function stats (callback) {
     return this;
   } else {
     if (this._isStreamInput()) {
-      return new Promise(function (resolve, reject) {
+      return new Promise((resolve, reject) => {
-        that.on('finish', function () {
+        this.on('finish', function () {
-          that._flattenBufferIn();
+          this._flattenBufferIn();
-          sharp.stats(that.options, function (err, stats) {
+          sharp.stats(this.options, (err, stats) => {
             if (err) {
               reject(err);
             } else {
@@ -304,8 +570,8 @@ function stats (callback) {
         });
       });
     } else {
-      return new Promise(function (resolve, reject) {
+      return new Promise((resolve, reject) => {
-        sharp.stats(that.options, function (err, stats) {
+        sharp.stats(this.options, (err, stats) => {
           if (err) {
             reject(err);
           } else {
@@ -317,61 +583,22 @@ function stats (callback) {
   }
 }
 
-/**
- * Do not process input images where the number of pixels (width * height) exceeds this limit.
- * Assumes image dimensions contained in the input metadata can be trusted.
- * The default limit is 268402689 (0x3FFF * 0x3FFF) pixels.
- * @param {(Number|Boolean)} limit - an integral Number of pixels, zero or false to remove limit, true to use default limit.
- * @returns {Sharp}
- * @throws {Error} Invalid limit
-*/
-function limitInputPixels (limit) {
-  // if we pass in false we represent the integer as 0 to disable
-  if (limit === false) {
-    limit = 0;
-  } else if (limit === true) {
-    limit = Math.pow(0x3FFF, 2);
-  }
-  if (is.integer(limit) && limit >= 0) {
-    this.options.limitInputPixels = limit;
-  } else {
-    throw is.invalidParameterError('limitInputPixels', 'integer', limit);
-  }
-  return this;
-}
-
-/**
- * An advanced setting that switches the libvips access method to `VIPS_ACCESS_SEQUENTIAL`.
- * This will reduce memory usage and can improve performance on some systems.
- *
- * The default behaviour *before* function call is `false`, meaning the libvips access method is not sequential.
- *
- * @param {Boolean} [sequentialRead=true]
- * @returns {Sharp}
- */
-function sequentialRead (sequentialRead) {
-  this.options.sequentialRead = is.bool(sequentialRead) ? sequentialRead : true;
-  return this;
-}
-
 /**
  * Decorate the Sharp prototype with input-related functions.
  * @private
  */
 module.exports = function (Sharp) {
-  [
+  Object.assign(Sharp.prototype, {
     // Private
+    _inputOptionsFromObject,
     _createInputDescriptor,
     _write,
     _flattenBufferIn,
     _isStreamInput,
     // Public
-    clone,
     metadata,
-    stats,
+    stats
-    limitInputPixels,
-    sequentialRead
-  ].forEach(function (f) {
-    Sharp.prototype[f.name] = f;
   });
+  // Class attributes
+  Sharp.align = align;
 };

lib/is.js

@@ -21,7 +21,7 @@ const object = function (val) {
  * @private
  */
 const plainObject = function (val) {
-  return object(val) && Object.prototype.toString.call(val) === '[object Object]';
+  return Object.prototype.toString.call(val) === '[object Object]';
 };
 
 /**
@@ -45,7 +45,30 @@ const bool = function (val) {
  * @private
  */
 const buffer = function (val) {
-  return object(val) && val instanceof Buffer;
+  return val instanceof Buffer;
+};
+
+/**
+ * Is this value a typed array object?. E.g. Uint8Array or Uint8ClampedArray?
+ * @private
+ */
+const typedArray = function (val) {
+  if (defined(val)) {
+    switch (val.constructor) {
+      case Uint8Array:
+      case Uint8ClampedArray:
+      case Int8Array:
+      case Uint16Array:
+      case Int16Array:
+      case Uint32Array:
+      case Int32Array:
+      case Float32Array:
+      case Float64Array:
+        return true;
+    }
+  }
+
+  return false;
 };
 
 /**
@@ -69,7 +92,7 @@ const number = function (val) {
  * @private
  */
 const integer = function (val) {
-  return number(val) && val % 1 === 0;
+  return Number.isInteger(val);
 };
 
 /**
@@ -85,14 +108,14 @@ const inRange = function (val, min, max) {
  * @private
  */
 const inArray = function (val, list) {
-  return list.indexOf(val) !== -1;
+  return list.includes(val);
 };
 
 /**
  * Create an Error with a message relating to an invalid parameter.
  *
- * @param {String} name - parameter name.
+ * @param {string} name - parameter name.
- * @param {String} expected - description of the type/value/range expected.
+ * @param {string} expected - description of the type/value/range expected.
  * @param {*} actual - the value received.
  * @returns {Error} Containing the formatted message.
  * @private
@@ -110,6 +133,7 @@ module.exports = {
   fn: fn,
   bool: bool,
   buffer: buffer,
+  typedArray: typedArray,
   string: string,
   number: number,
   integer: integer,

lib/libvips.js

@@ -4,60 +4,106 @@ const fs = require('fs');
 const os = require('os');
 const path = require('path');
 const spawnSync = require('child_process').spawnSync;
-const semver = require('semver');
+const semverCoerce = require('semver/functions/coerce');
+const semverGreaterThanOrEqualTo = require('semver/functions/gte');
+
 const platform = require('./platform');
+const { config } = require('../package.json');
 
 const env = process.env;
-const minimumLibvipsVersion = env.npm_package_config_libvips || require('../package.json').config.libvips;
+const minimumLibvipsVersionLabelled = env.npm_package_config_libvips || /* istanbul ignore next */
+  config.libvips;
+const minimumLibvipsVersion = semverCoerce(minimumLibvipsVersionLabelled).version;
 
 const spawnSyncOptions = {
   encoding: 'utf8',
   shell: true
 };
 
+const vendorPath = path.join(__dirname, '..', 'vendor', minimumLibvipsVersion, platform());
+
+const mkdirSync = function (dirPath) {
+  try {
+    fs.mkdirSync(dirPath, { recursive: true });
+  } catch (err) {
+    /* istanbul ignore next */
+    if (err.code !== 'EEXIST') {
+      throw err;
+    }
+  }
+};
+
 const cachePath = function () {
-  const npmCachePath = env.npm_config_cache || (env.APPDATA ? path.join(env.APPDATA, 'npm-cache') : path.join(os.homedir(), '.npm'));
+  const npmCachePath = env.npm_config_cache || /* istanbul ignore next */
-  if (!fs.existsSync(npmCachePath)) {
+    (env.APPDATA ? path.join(env.APPDATA, 'npm-cache') : path.join(os.homedir(), '.npm'));
-    fs.mkdirSync(npmCachePath);
+  mkdirSync(npmCachePath);
-  }
   const libvipsCachePath = path.join(npmCachePath, '_libvips');
-  if (!fs.existsSync(libvipsCachePath)) {
+  mkdirSync(libvipsCachePath);
-    fs.mkdirSync(libvipsCachePath);
-  }
   return libvipsCachePath;
 };
 
+const integrity = function (platformAndArch) {
+  return env[`npm_package_config_integrity_${platformAndArch.replace('-', '_')}`] || config.integrity[platformAndArch];
+};
+
+const log = function (item) {
+  if (item instanceof Error) {
+    console.error(`sharp: Installation error: ${item.message}`);
+  } else {
+    console.log(`sharp: ${item}`);
+  }
+};
+
+const isRosetta = function () {
+  /* istanbul ignore next */
+  if (process.platform === 'darwin' && process.arch === 'x64') {
+    const translated = spawnSync('sysctl sysctl.proc_translated', spawnSyncOptions).stdout;
+    return (translated || '').trim() === 'sysctl.proc_translated: 1';
+  }
+  return false;
+};
+
 const globalLibvipsVersion = function () {
   if (process.platform !== 'win32') {
-    const globalLibvipsVersion = spawnSync(`PKG_CONFIG_PATH="${pkgConfigPath()}" pkg-config --modversion vips-cpp`, spawnSyncOptions).stdout || '';
+    const globalLibvipsVersion = spawnSync('pkg-config --modversion vips-cpp', {
-    return globalLibvipsVersion.trim();
+      ...spawnSyncOptions,
+      env: {
+        ...env,
+        PKG_CONFIG_PATH: pkgConfigPath()
+      }
+    }).stdout;
+    /* istanbul ignore next */
+    return (globalLibvipsVersion || '').trim();
   } else {
     return '';
   }
 };
 
 const hasVendoredLibvips = function () {
-  const currentPlatformId = platform();
+  return fs.existsSync(vendorPath);
-  let vendorPlatformId;
-  try {
-    vendorPlatformId = require(path.join(__dirname, '..', 'vendor', 'platform.json'));
-  } catch (err) {}
-  if (vendorPlatformId) {
-    if (currentPlatformId === vendorPlatformId) {
-      return true;
-    } else {
-      throw new Error(`'${vendorPlatformId}' binaries cannot be used on the '${currentPlatformId}' platform. Please remove the 'node_modules/sharp/vendor' directory and run 'npm install'.`);
-    }
-  }
-  return false;
 };
 
+/* istanbul ignore next */
+const removeVendoredLibvips = function () {
+  const rm = fs.rmSync ? fs.rmSync : fs.rmdirSync;
+  rm(vendorPath, { recursive: true, maxRetries: 3, force: true });
+};
+
+/* istanbul ignore next */
 const pkgConfigPath = function () {
   if (process.platform !== 'win32') {
-    const brewPkgConfigPath = spawnSync('which brew >/dev/null 2>&1 && eval $(brew --env) && echo $PKG_CONFIG_LIBDIR', spawnSyncOptions).stdout || '';
+    const brewPkgConfigPath = spawnSync(
-    return [brewPkgConfigPath.trim(), env.PKG_CONFIG_PATH, '/usr/local/lib/pkgconfig', '/usr/lib/pkgconfig']
+      'which brew >/dev/null 2>&1 && brew environment --plain | grep PKG_CONFIG_LIBDIR | cut -d" " -f2',
-      .filter(function (p) { return !!p; })
+      spawnSyncOptions
-      .join(':');
+    ).stdout || '';
+    return [
+      brewPkgConfigPath.trim(),
+      env.PKG_CONFIG_PATH,
+      '/usr/local/lib/pkgconfig',
+      '/usr/lib/pkgconfig',
+      '/usr/local/libdata/pkgconfig',
+      '/usr/libdata/pkgconfig'
+    ].filter(Boolean).join(':');
   } else {
     return '';
   }
@@ -67,16 +113,25 @@ const useGlobalLibvips = function () {
   if (Boolean(env.SHARP_IGNORE_GLOBAL_LIBVIPS) === true) {
     return false;
   }
-
+  /* istanbul ignore next */
+  if (isRosetta()) {
+    return false;
+  }
   const globalVipsVersion = globalLibvipsVersion();
-  return !!globalVipsVersion && semver.gte(globalVipsVersion, minimumLibvipsVersion);
+  return !!globalVipsVersion && /* istanbul ignore next */
+    semverGreaterThanOrEqualTo(globalVipsVersion, minimumLibvipsVersion);
 };
 
 module.exports = {
-  minimumLibvipsVersion: minimumLibvipsVersion,
+  minimumLibvipsVersion,
-  cachePath: cachePath,
+  minimumLibvipsVersionLabelled,
-  globalLibvipsVersion: globalLibvipsVersion,
+  cachePath,
-  hasVendoredLibvips: hasVendoredLibvips,
+  integrity,
-  pkgConfigPath: pkgConfigPath,
+  log,
-  useGlobalLibvips: useGlobalLibvips
+  globalLibvipsVersion,
+  hasVendoredLibvips,
+  removeVendoredLibvips,
+  pkgConfigPath,
+  useGlobalLibvips,
+  mkdirSync
 };

lib/operation.js

@@ -1,21 +1,28 @@
 'use strict';
 
+const color = require('color');
 const is = require('./is');
 
 /**
  * Rotate the output image by either an explicit angle
  * or auto-orient based on the EXIF `Orientation` tag.
  *
- * If an angle is provided, it is converted to a valid 90/180/270deg rotation.
+ * If an angle is provided, it is converted to a valid positive degree rotation.
  * For example, `-450` will produce a 270deg rotation.
  *
+ * When rotating by an angle other than a multiple of 90,
+ * the background colour can be provided with the `background` option.
+ *
  * If no angle is provided, it is determined from the EXIF data.
  * Mirroring is supported and may infer the use of a flip operation.
  *
  * The use of `rotate` implies the removal of the EXIF `Orientation` tag, if any.
  *
- * Method order is important when both rotating and extracting regions,
+ * Only one rotation can occur per pipeline.
- * for example `rotate(x).extract(y)` will produce a different result to `extract(y).rotate(x)`.
+ * Previous calls to `rotate` in the same pipeline will be ignored.
+ *
+ * Method order is important when rotating, resizing and/or extracting regions,
+ * for example `.rotate(x).extract(y)` will produce a different result to `.extract(y).rotate(x)`.
  *
  * @example
  * const pipeline = sharp()
@@ -28,71 +35,54 @@ const is = require('./is');
  *   });
  * readableStream.pipe(pipeline);
  *
- * @param {Number} [angle=auto] angle of rotation, must be a multiple of 90.
+ * @example
+ * const rotateThenResize = await sharp(input)
+ *   .rotate(90)
+ *   .resize({ width: 16, height: 8, fit: 'fill' })
+ *   .toBuffer();
+ * const resizeThenRotate = await sharp(input)
+ *   .resize({ width: 16, height: 8, fit: 'fill' })
+ *   .rotate(90)
+ *   .toBuffer();
+ *
+ * @param {number} [angle=auto] angle of rotation.
+ * @param {Object} [options] - if present, is an Object with optional attributes.
+ * @param {string|Object} [options.background="#000000"] parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
-function rotate (angle) {
+function rotate (angle, options) {
+  if (this.options.useExifOrientation || this.options.angle || this.options.rotationAngle) {
+    this.options.debuglog('ignoring previous rotate options');
+  }
   if (!is.defined(angle)) {
     this.options.useExifOrientation = true;
   } else if (is.integer(angle) && !(angle % 90)) {
     this.options.angle = angle;
-  } else {
+  } else if (is.number(angle)) {
-    throw new Error('Unsupported angle: angle must be a positive/negative multiple of 90 ' + angle);
+    this.options.rotationAngle = angle;
-  }
+    if (is.object(options) && options.background) {
-  return this;
+      const backgroundColour = color(options.background);
-}
+      this.options.rotationBackground = [
-
+        backgroundColour.red(),
-/**
+        backgroundColour.green(),
- * Extract a region of the image.
+        backgroundColour.blue(),
- *
+        Math.round(backgroundColour.alpha() * 255)
- * - Use `extract` before `resize` for pre-resize extraction.
+      ];
- * - Use `extract` after `resize` for post-resize extraction.
- * - Use `extract` before and after for both.
- *
- * @example
- * sharp(input)
- *   .extract({ left: left, top: top, width: width, height: height })
- *   .toFile(output, function(err) {
- *     // Extract a region of the input image, saving in the same format.
- *   });
- * @example
- * sharp(input)
- *   .extract({ left: leftOffsetPre, top: topOffsetPre, width: widthPre, height: heightPre })
- *   .resize(width, height)
- *   .extract({ left: leftOffsetPost, top: topOffsetPost, width: widthPost, height: heightPost })
- *   .toFile(output, function(err) {
- *     // Extract a region, resize, then extract from the resized image
- *   });
- *
- * @param {Object} options
- * @param {Number} options.left - zero-indexed offset from left edge
- * @param {Number} options.top - zero-indexed offset from top edge
- * @param {Number} options.width - dimension of extracted image
- * @param {Number} options.height - dimension of extracted image
- * @returns {Sharp}
- * @throws {Error} Invalid parameters
- */
-function extract (options) {
-  const suffix = this.options.width === -1 && this.options.height === -1 ? 'Pre' : 'Post';
-  ['left', 'top', 'width', 'height'].forEach(function (name) {
-    const value = options[name];
-    if (is.integer(value) && value >= 0) {
-      this.options[name + (name === 'left' || name === 'top' ? 'Offset' : '') + suffix] = value;
-    } else {
-      throw new Error('Non-integer value for ' + name + ' of ' + value);
     }
-  }, this);
+  } else {
-  // Ensure existing rotation occurs before pre-resize extraction
+    throw is.invalidParameterError('angle', 'numeric', angle);
-  if (suffix === 'Pre' && ((this.options.angle % 360) !== 0 || this.options.useExifOrientation === true)) {
-    this.options.rotateBeforePreExtract = true;
   }
   return this;
 }
 
 /**
- * Flip the image about the vertical Y axis. This always occurs after rotation, if any.
+ * Flip the image about the vertical Y axis. This always occurs before rotation, if any.
  * The use of `flip` implies the removal of the EXIF `Orientation` tag, if any.
+ *
+ * @example
+ * const output = await sharp(input).flip().toBuffer();
+ *
  * @param {Boolean} [flip=true]
  * @returns {Sharp}
  */
@@ -102,8 +92,12 @@ function flip (flip) {
 }
 
 /**
- * Flop the image about the horizontal X axis. This always occurs after rotation, if any.
+ * Flop the image about the horizontal X axis. This always occurs before rotation, if any.
  * The use of `flop` implies the removal of the EXIF `Orientation` tag, if any.
+ *
+ * @example
+ * const output = await sharp(input).flop().toBuffer();
+ *
  * @param {Boolean} [flop=true]
  * @returns {Sharp}
  */
@@ -113,45 +107,211 @@ function flop (flop) {
 }
 
 /**
- * Sharpen the image.
+ * Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any.
- * When used without parameters, performs a fast, mild sharpen of the output image.
- * When a `sigma` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space.
- * Separate control over the level of sharpening in "flat" and "jagged" areas is available.
  *
- * @param {Number} [sigma] - the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+ * You must provide an array of length 4 or a 2x2 affine transformation matrix.
- * @param {Number} [flat=1.0] - the level of sharpening to apply to "flat" areas.
+ * By default, new pixels are filled with a black background. You can provide a background color with the `background` option.
- * @param {Number} [jagged=2.0] - the level of sharpening to apply to "jagged" areas.
+ * A particular interpolator may also be specified. Set the `interpolator` option to an attribute of the `sharp.interpolator` Object e.g. `sharp.interpolator.nohalo`.
+ *
+ * In the case of a 2x2 matrix, the transform is:
+ * - X = `matrix[0, 0]` \* (x + `idx`) + `matrix[0, 1]` \* (y + `idy`) + `odx`
+ * - Y = `matrix[1, 0]` \* (x + `idx`) + `matrix[1, 1]` \* (y + `idy`) + `ody`
+ *
+ * where:
+ * - x and y are the coordinates in input image.
+ * - X and Y are the coordinates in output image.
+ * - (0,0) is the upper left corner.
+ *
+ * @since 0.27.0
+ *
+ * @example
+ * const pipeline = sharp()
+ *   .affine([[1, 0.3], [0.1, 0.7]], {
+ *      background: 'white',
+ *      interpolate: sharp.interpolators.nohalo
+ *   })
+ *   .toBuffer((err, outputBuffer, info) => {
+ *      // outputBuffer contains the transformed image
+ *      // info.width and info.height contain the new dimensions
+ *   });
+ *
+ * inputStream
+ *   .pipe(pipeline);
+ *
+ * @param {Array<Array<number>>|Array<number>} matrix - affine transformation matrix
+ * @param {Object} [options] - if present, is an Object with optional attributes.
+ * @param {String|Object} [options.background="#000000"] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @param {Number} [options.idx=0] - input horizontal offset
+ * @param {Number} [options.idy=0] - input vertical offset
+ * @param {Number} [options.odx=0] - output horizontal offset
+ * @param {Number} [options.ody=0] - output vertical offset
+ * @param {String} [options.interpolator=sharp.interpolators.bicubic] - interpolator
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
-function sharpen (sigma, flat, jagged) {
+function affine (matrix, options) {
-  if (!is.defined(sigma)) {
+  const flatMatrix = [].concat(...matrix);
+  if (flatMatrix.length === 4 && flatMatrix.every(is.number)) {
+    this.options.affineMatrix = flatMatrix;
+  } else {
+    throw is.invalidParameterError('matrix', '1x4 or 2x2 array', matrix);
+  }
+
+  if (is.defined(options)) {
+    if (is.object(options)) {
+      this._setBackgroundColourOption('affineBackground', options.background);
+      if (is.defined(options.idx)) {
+        if (is.number(options.idx)) {
+          this.options.affineIdx = options.idx;
+        } else {
+          throw is.invalidParameterError('options.idx', 'number', options.idx);
+        }
+      }
+      if (is.defined(options.idy)) {
+        if (is.number(options.idy)) {
+          this.options.affineIdy = options.idy;
+        } else {
+          throw is.invalidParameterError('options.idy', 'number', options.idy);
+        }
+      }
+      if (is.defined(options.odx)) {
+        if (is.number(options.odx)) {
+          this.options.affineOdx = options.odx;
+        } else {
+          throw is.invalidParameterError('options.odx', 'number', options.odx);
+        }
+      }
+      if (is.defined(options.ody)) {
+        if (is.number(options.ody)) {
+          this.options.affineOdy = options.ody;
+        } else {
+          throw is.invalidParameterError('options.ody', 'number', options.ody);
+        }
+      }
+      if (is.defined(options.interpolator)) {
+        if (is.inArray(options.interpolator, Object.values(this.constructor.interpolators))) {
+          this.options.affineInterpolator = options.interpolator;
+        } else {
+          throw is.invalidParameterError('options.interpolator', 'valid interpolator name', options.interpolator);
+        }
+      }
+    } else {
+      throw is.invalidParameterError('options', 'object', options);
+    }
+  }
+
+  return this;
+}
+
+/**
+ * Sharpen the image.
+ *
+ * When used without parameters, performs a fast, mild sharpen of the output image.
+ *
+ * When a `sigma` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space.
+ * Fine-grained control over the level of sharpening in "flat" (m1) and "jagged" (m2) areas is available.
+ *
+ * See {@link https://www.libvips.org/API/current/libvips-convolution.html#vips-sharpen|libvips sharpen} operation.
+ *
+ * @example
+ * const data = await sharp(input).sharpen().toBuffer();
+ *
+ * @example
+ * const data = await sharp(input).sharpen({ sigma: 2 }).toBuffer();
+ *
+ * @example
+ * const data = await sharp(input)
+ *   .sharpen({
+ *     sigma: 2,
+ *     m1: 0,
+ *     m2: 3,
+ *     x1: 3,
+ *     y2: 15,
+ *     y3: 15,
+ *   })
+ *   .toBuffer();
+ *
+ * @param {Object|number} [options] - if present, is an Object with attributes
+ * @param {number} [options.sigma] - the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`, between 0.000001 and 10000
+ * @param {number} [options.m1=1.0] - the level of sharpening to apply to "flat" areas, between 0 and 1000000
+ * @param {number} [options.m2=2.0] - the level of sharpening to apply to "jagged" areas, between 0 and 1000000
+ * @param {number} [options.x1=2.0] - threshold between "flat" and "jagged", between 0 and 1000000
+ * @param {number} [options.y2=10.0] - maximum amount of brightening, between 0 and 1000000
+ * @param {number} [options.y3=20.0] - maximum amount of darkening, between 0 and 1000000
+ * @param {number} [flat] - (deprecated) see `options.m1`.
+ * @param {number} [jagged] - (deprecated) see `options.m2`.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function sharpen (options, flat, jagged) {
+  if (!is.defined(options)) {
     // No arguments: default to mild sharpen
     this.options.sharpenSigma = -1;
-  } else if (is.bool(sigma)) {
+  } else if (is.bool(options)) {
-    // Boolean argument: apply mild sharpen?
+    // Deprecated boolean argument: apply mild sharpen?
-    this.options.sharpenSigma = sigma ? -1 : 0;
+    this.options.sharpenSigma = options ? -1 : 0;
-  } else if (is.number(sigma) && is.inRange(sigma, 0.01, 10000)) {
+  } else if (is.number(options) && is.inRange(options, 0.01, 10000)) {
-    // Numeric argument: specific sigma
+    // Deprecated numeric argument: specific sigma
-    this.options.sharpenSigma = sigma;
+    this.options.sharpenSigma = options;
-    // Control over flat areas
+    // Deprecated control over flat areas
     if (is.defined(flat)) {
       if (is.number(flat) && is.inRange(flat, 0, 10000)) {
-        this.options.sharpenFlat = flat;
+        this.options.sharpenM1 = flat;
       } else {
-        throw new Error('Invalid sharpen level for flat areas (0.0 - 10000.0) ' + flat);
+        throw is.invalidParameterError('flat', 'number between 0 and 10000', flat);
       }
     }
-    // Control over jagged areas
+    // Deprecated control over jagged areas
     if (is.defined(jagged)) {
       if (is.number(jagged) && is.inRange(jagged, 0, 10000)) {
-        this.options.sharpenJagged = jagged;
+        this.options.sharpenM2 = jagged;
       } else {
-        throw new Error('Invalid sharpen level for jagged areas (0.0 - 10000.0) ' + jagged);
+        throw is.invalidParameterError('jagged', 'number between 0 and 10000', jagged);
+      }
+    }
+  } else if (is.plainObject(options)) {
+    if (is.number(options.sigma) && is.inRange(options.sigma, 0.000001, 10000)) {
+      this.options.sharpenSigma = options.sigma;
+    } else {
+      throw is.invalidParameterError('options.sigma', 'number between 0.000001 and 10000', options.sigma);
+    }
+    if (is.defined(options.m1)) {
+      if (is.number(options.m1) && is.inRange(options.m1, 0, 1000000)) {
+        this.options.sharpenM1 = options.m1;
+      } else {
+        throw is.invalidParameterError('options.m1', 'number between 0 and 1000000', options.m1);
+      }
+    }
+    if (is.defined(options.m2)) {
+      if (is.number(options.m2) && is.inRange(options.m2, 0, 1000000)) {
+        this.options.sharpenM2 = options.m2;
+      } else {
+        throw is.invalidParameterError('options.m2', 'number between 0 and 1000000', options.m2);
+      }
+    }
+    if (is.defined(options.x1)) {
+      if (is.number(options.x1) && is.inRange(options.x1, 0, 1000000)) {
+        this.options.sharpenX1 = options.x1;
+      } else {
+        throw is.invalidParameterError('options.x1', 'number between 0 and 1000000', options.x1);
+      }
+    }
+    if (is.defined(options.y2)) {
+      if (is.number(options.y2) && is.inRange(options.y2, 0, 1000000)) {
+        this.options.sharpenY2 = options.y2;
+      } else {
+        throw is.invalidParameterError('options.y2', 'number between 0 and 1000000', options.y2);
+      }
+    }
+    if (is.defined(options.y3)) {
+      if (is.number(options.y3) && is.inRange(options.y3, 0, 1000000)) {
+        this.options.sharpenY3 = options.y3;
+      } else {
+        throw is.invalidParameterError('options.y3', 'number between 0 and 1000000', options.y3);
       }
     }
   } else {
-    throw new Error('Invalid sharpen sigma (0.01 - 10000) ' + sigma);
+    throw is.invalidParameterError('sigma', 'number between 0.01 and 10000', options);
   }
   return this;
 }
@@ -159,7 +319,14 @@ function sharpen (sigma, flat, jagged) {
 /**
  * Apply median filter.
  * When used without parameters the default window is 3x3.
- * @param {Number} [size=3] square mask size: size x size
+ *
+ * @example
+ * const output = await sharp(input).median().toBuffer();
+ *
+ * @example
+ * const output = await sharp(input).median(5).toBuffer();
+ *
+ * @param {number} [size=3] square mask size: size x size
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -171,16 +338,29 @@ function median (size) {
     // Numeric argument: specific sigma
     this.options.medianSize = size;
   } else {
-    throw new Error('Invalid median size ' + size);
+    throw is.invalidParameterError('size', 'integer between 1 and 1000', size);
   }
   return this;
 }
 
 /**
  * Blur the image.
- * When used without parameters, performs a fast, mild blur of the output image.
+ *
+ * When used without parameters, performs a fast 3x3 box blur (equivalent to a box linear filter).
+ *
  * When a `sigma` is provided, performs a slower, more accurate Gaussian blur.
- * @param {Number} [sigma] a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+ *
+ * @example
+ * const boxBlurred = await sharp(input)
+ *   .blur()
+ *   .toBuffer();
+ *
+ * @example
+ * const gaussianBlurred = await sharp(input)
+ *   .blur(5)
+ *   .toBuffer();
+ *
+ * @param {number} [sigma] a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -195,78 +375,29 @@ function blur (sigma) {
     // Numeric argument: specific sigma
     this.options.blurSigma = sigma;
   } else {
-    throw new Error('Invalid blur sigma (0.3 - 1000.0) ' + sigma);
+    throw is.invalidParameterError('sigma', 'number between 0.3 and 1000', sigma);
   }
   return this;
 }
 
 /**
- * Extends/pads the edges of the image with the colour provided to the `background` method.
+ * Merge alpha transparency channel, if any, with a background, then remove the alpha channel.
- * This operation will always occur after resizing and extraction, if any.
+ *
+ * See also {@link /api-channel#removealpha|removeAlpha}.
  *
  * @example
- * // Resize to 140 pixels wide, then add 10 transparent pixels
+ * await sharp(rgbaInput)
- * // to the top, left and right edges and 20 to the bottom edge
+ *   .flatten({ background: '#F0A703' })
- * sharp(input)
+ *   .toBuffer();
- *   .resize(140)
- *   .background({r: 0, g: 0, b: 0, alpha: 0})
- *   .extend({top: 10, bottom: 20, left: 10, right: 10})
- *   ...
  *
- * @param {(Number|Object)} extend - single pixel count to add to all edges or an Object with per-edge counts
+ * @param {Object} [options]
- * @param {Number} [extend.top]
+ * @param {string|Object} [options.background={r: 0, g: 0, b: 0}] - background colour, parsed by the [color](https://www.npmjs.org/package/color) module, defaults to black.
- * @param {Number} [extend.left]
- * @param {Number} [extend.bottom]
- * @param {Number} [extend.right]
- * @returns {Sharp}
- * @throws {Error} Invalid parameters
-*/
-function extend (extend) {
-  if (is.integer(extend) && extend > 0) {
-    this.options.extendTop = extend;
-    this.options.extendBottom = extend;
-    this.options.extendLeft = extend;
-    this.options.extendRight = extend;
-  } else if (
-    is.object(extend) &&
-    is.integer(extend.top) && extend.top >= 0 &&
-    is.integer(extend.bottom) && extend.bottom >= 0 &&
-    is.integer(extend.left) && extend.left >= 0 &&
-    is.integer(extend.right) && extend.right >= 0
-  ) {
-    this.options.extendTop = extend.top;
-    this.options.extendBottom = extend.bottom;
-    this.options.extendLeft = extend.left;
-    this.options.extendRight = extend.right;
-  } else {
-    throw new Error('Invalid edge extension ' + extend);
-  }
-  return this;
-}
-
-/**
- * Merge alpha transparency channel, if any, with `background`.
- * @param {Boolean} [flatten=true]
  * @returns {Sharp}
  */
-function flatten (flatten) {
+function flatten (options) {
-  this.options.flatten = is.bool(flatten) ? flatten : true;
+  this.options.flatten = is.bool(options) ? options : true;
-  return this;
+  if (is.object(options)) {
-}
+    this._setBackgroundColourOption('flattenBackground', options.background);
-
-/**
- * Trim "boring" pixels from all edges that contain values within a percentage similarity of the top-left pixel.
- * @param {Number} [tolerance=10] value between 1 and 99 representing the percentage similarity.
- * @returns {Sharp}
- * @throws {Error} Invalid parameters
- */
-function trim (tolerance) {
-  if (!is.defined(tolerance)) {
-    this.options.trimTolerance = 10;
-  } else if (is.integer(tolerance) && is.inRange(tolerance, 1, 99)) {
-    this.options.trimTolerance = tolerance;
-  } else {
-    throw new Error('Invalid trim tolerance (1 to 99) ' + tolerance);
   }
   return this;
 }
@@ -277,34 +408,69 @@ function trim (tolerance) {
  * This can improve the perceived brightness of a resized image in non-linear colour spaces.
  * JPEG and WebP input images will not take advantage of the shrink-on-load performance optimisation
  * when applying a gamma correction.
- * @param {Number} [gamma=2.2] value between 1.0 and 3.0.
+ *
+ * Supply a second argument to use a different output gamma value, otherwise the first value is used in both cases.
+ *
+ * @param {number} [gamma=2.2] value between 1.0 and 3.0.
+ * @param {number} [gammaOut] value between 1.0 and 3.0. (optional, defaults to same as `gamma`)
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
-function gamma (gamma) {
+function gamma (gamma, gammaOut) {
   if (!is.defined(gamma)) {
     // Default gamma correction of 2.2 (sRGB)
     this.options.gamma = 2.2;
   } else if (is.number(gamma) && is.inRange(gamma, 1, 3)) {
     this.options.gamma = gamma;
   } else {
-    throw new Error('Invalid gamma correction (1.0 to 3.0) ' + gamma);
+    throw is.invalidParameterError('gamma', 'number between 1.0 and 3.0', gamma);
+  }
+  if (!is.defined(gammaOut)) {
+    // Default gamma correction for output is same as input
+    this.options.gammaOut = this.options.gamma;
+  } else if (is.number(gammaOut) && is.inRange(gammaOut, 1, 3)) {
+    this.options.gammaOut = gammaOut;
+  } else {
+    throw is.invalidParameterError('gammaOut', 'number between 1.0 and 3.0', gammaOut);
   }
   return this;
 }
 
 /**
  * Produce the "negative" of the image.
- * @param {Boolean} [negate=true]
+ *
+ * @example
+ * const output = await sharp(input)
+ *   .negate()
+ *   .toBuffer();
+ *
+ * @example
+ * const output = await sharp(input)
+ *   .negate({ alpha: false })
+ *   .toBuffer();
+ *
+ * @param {Object} [options]
+ * @param {Boolean} [options.alpha=true] Whether or not to negate any alpha channel
  * @returns {Sharp}
  */
-function negate (negate) {
+function negate (options) {
-  this.options.negate = is.bool(negate) ? negate : true;
+  this.options.negate = is.bool(options) ? options : true;
+  if (is.plainObject(options) && 'alpha' in options) {
+    if (!is.bool(options.alpha)) {
+      throw is.invalidParameterError('alpha', 'should be boolean value', options.alpha);
+    } else {
+      this.options.negateAlpha = options.alpha;
+    }
+  }
   return this;
 }
 
 /**
  * Enhance output image contrast by stretching its luminance to cover the full dynamic range.
+ *
+ * @example
+ * const output = await sharp(input).normalise().toBuffer();
+ *
  * @param {Boolean} [normalise=true]
  * @returns {Sharp}
  */
@@ -315,6 +481,10 @@ function normalise (normalise) {
 
 /**
  * Alternative spelling of normalise.
+ *
+ * @example
+ * const output = await sharp(input).normalize().toBuffer();
+ *
  * @param {Boolean} [normalize=true]
  * @returns {Sharp}
  */
@@ -322,6 +492,55 @@ function normalize (normalize) {
   return this.normalise(normalize);
 }
 
+/**
+ * Perform contrast limiting adaptive histogram equalization
+ * {@link https://en.wikipedia.org/wiki/Adaptive_histogram_equalization#Contrast_Limited_AHE|CLAHE}.
+ *
+ * This will, in general, enhance the clarity of the image by bringing out darker details.
+ *
+ * @since 0.28.3
+ *
+ * @example
+ * const output = await sharp(input)
+ *   .clahe({
+ *     width: 3,
+ *     height: 3,
+ *   })
+ *   .toBuffer();
+ *
+ * @param {Object} options
+ * @param {number} options.width - integer width of the region in pixels.
+ * @param {number} options.height - integer height of the region in pixels.
+ * @param {number} [options.maxSlope=3] - maximum value for the slope of the
+ *  cumulative histogram. A value of 0 disables contrast limiting. Valid values
+ *  are integers in the range 0-100 (inclusive)
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function clahe (options) {
+  if (!is.plainObject(options)) {
+    throw is.invalidParameterError('options', 'plain object', options);
+  }
+  if (!('width' in options) || !is.integer(options.width) || options.width <= 0) {
+    throw is.invalidParameterError('width', 'integer above zero', options.width);
+  } else {
+    this.options.claheWidth = options.width;
+  }
+  if (!('height' in options) || !is.integer(options.height) || options.height <= 0) {
+    throw is.invalidParameterError('height', 'integer above zero', options.height);
+  } else {
+    this.options.claheHeight = options.height;
+  }
+  if (!is.defined(options.maxSlope)) {
+    this.options.claheMaxSlope = 3;
+  } else if (!is.integer(options.maxSlope) || options.maxSlope < 0 || options.maxSlope > 100) {
+    throw is.invalidParameterError('maxSlope', 'integer 0-100', options.maxSlope);
+  } else {
+    this.options.claheMaxSlope = options.maxSlope;
+  }
+  return this;
+}
+
 /**
  * Convolve the image with the specified kernel.
  *
@@ -339,11 +558,11 @@ function normalize (normalize) {
  *   });
  *
  * @param {Object} kernel
- * @param {Number} kernel.width - width of the kernel in pixels.
+ * @param {number} kernel.width - width of the kernel in pixels.
- * @param {Number} kernel.height - width of the kernel in pixels.
+ * @param {number} kernel.height - height of the kernel in pixels.
- * @param {Array<Number>} kernel.kernel - Array of length `width*height` containing the kernel values.
+ * @param {Array<number>} kernel.kernel - Array of length `width*height` containing the kernel values.
- * @param {Number} [kernel.scale=sum] - the scale of the kernel in pixels.
+ * @param {number} [kernel.scale=sum] - the scale of the kernel in pixels.
- * @param {Number} [kernel.offset=0] - the offset of the kernel in pixels.
+ * @param {number} [kernel.offset=0] - the offset of the kernel in pixels.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -374,8 +593,8 @@ function convolve (kernel) {
 }
 
 /**
- * Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
+ * Any pixel value greater than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
- * @param {Number} [threshold=128] - a value in the range 0-255 representing the level at which the threshold will be applied.
+ * @param {number} [threshold=128] - a value in the range 0-255 representing the level at which the threshold will be applied.
  * @param {Object} [options]
  * @param {Boolean} [options.greyscale=true] - convert to single channel greyscale.
  * @param {Boolean} [options.grayscale=true] - alternative spelling for greyscale.
@@ -390,7 +609,7 @@ function threshold (threshold, options) {
   } else if (is.integer(threshold) && is.inRange(threshold, 0, 255)) {
     this.options.threshold = threshold;
   } else {
-    throw new Error('Invalid threshold (0 to 255) ' + threshold);
+    throw is.invalidParameterError('threshold', 'integer between 0 and 255', threshold);
   }
   if (!is.object(options) || options.greyscale === true || options.grayscale === true) {
     this.options.thresholdGrayscale = true;
@@ -406,13 +625,13 @@ function threshold (threshold, options) {
  * This operation creates an output image where each pixel is the result of
  * the selected bitwise boolean `operation` between the corresponding pixels of the input images.
  *
- * @param {Buffer|String} operand - Buffer containing image data or String containing the path to an image file.
+ * @param {Buffer|string} operand - Buffer containing image data or string containing the path to an image file.
- * @param {String} operator - one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+ * @param {string} operator - one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
  * @param {Object} [options]
  * @param {Object} [options.raw] - describes operand when using raw pixel data.
- * @param {Number} [options.raw.width]
+ * @param {number} [options.raw.width]
- * @param {Number} [options.raw.height]
+ * @param {number} [options.raw.height]
- * @param {Number} [options.raw.channels]
+ * @param {number} [options.raw.channels]
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -421,35 +640,184 @@ function boolean (operand, operator, options) {
   if (is.string(operator) && is.inArray(operator, ['and', 'or', 'eor'])) {
     this.options.booleanOp = operator;
   } else {
-    throw new Error('Invalid boolean operator ' + operator);
+    throw is.invalidParameterError('operator', 'one of: and, or, eor', operator);
   }
   return this;
 }
 
 /**
- * Apply the linear formula a * input + b to the image (levels adjustment)
+ * Apply the linear formula `a` * input + `b` to the image to adjust image levels.
- * @param {Number} [a=1.0] multiplier
+ *
- * @param {Number} [b=0.0] offset
+ * When a single number is provided, it will be used for all image channels.
+ * When an array of numbers is provided, the array length must match the number of channels.
+ *
+ * @example
+ * await sharp(input)
+ *   .linear(0.5, 2)
+ *   .toBuffer();
+ *
+ * @example
+ * await sharp(rgbInput)
+ *   .linear(
+ *     [0.25, 0.5, 0.75],
+ *     [150, 100, 50]
+ *   )
+ *   .toBuffer();
+ *
+ * @param {(number|number[])} [a=[]] multiplier
+ * @param {(number|number[])} [b=[]] offset
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
 function linear (a, b) {
+  if (!is.defined(a) && is.number(b)) {
+    a = 1.0;
+  } else if (is.number(a) && !is.defined(b)) {
+    b = 0.0;
+  }
   if (!is.defined(a)) {
-    this.options.linearA = 1.0;
+    this.options.linearA = [];
   } else if (is.number(a)) {
+    this.options.linearA = [a];
+  } else if (Array.isArray(a) && a.length && a.every(is.number)) {
     this.options.linearA = a;
   } else {
-    throw new Error('Invalid linear transform multiplier ' + a);
+    throw is.invalidParameterError('a', 'number or array of numbers', a);
   }
-
   if (!is.defined(b)) {
-    this.options.linearB = 0.0;
+    this.options.linearB = [];
   } else if (is.number(b)) {
+    this.options.linearB = [b];
+  } else if (Array.isArray(b) && b.length && b.every(is.number)) {
     this.options.linearB = b;
   } else {
-    throw new Error('Invalid linear transform offset ' + b);
+    throw is.invalidParameterError('b', 'number or array of numbers', b);
   }
+  if (this.options.linearA.length !== this.options.linearB.length) {
+    throw new Error('Expected a and b to be arrays of the same length');
+  }
+  return this;
+}
 
+/**
+ * Recomb the image with the specified matrix.
+ *
+ * @since 0.21.1
+ *
+ * @example
+ * sharp(input)
+ *   .recomb([
+ *    [0.3588, 0.7044, 0.1368],
+ *    [0.2990, 0.5870, 0.1140],
+ *    [0.2392, 0.4696, 0.0912],
+ *   ])
+ *   .raw()
+ *   .toBuffer(function(err, data, info) {
+ *     // data contains the raw pixel data after applying the recomb
+ *     // With this example input, a sepia filter has been applied
+ *   });
+ *
+ * @param {Array<Array<number>>} inputMatrix - 3x3 Recombination matrix
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function recomb (inputMatrix) {
+  if (!Array.isArray(inputMatrix) || inputMatrix.length !== 3 ||
+      inputMatrix[0].length !== 3 ||
+      inputMatrix[1].length !== 3 ||
+      inputMatrix[2].length !== 3
+  ) {
+    // must pass in a kernel
+    throw new Error('Invalid recombination matrix');
+  }
+  this.options.recombMatrix = [
+    inputMatrix[0][0], inputMatrix[0][1], inputMatrix[0][2],
+    inputMatrix[1][0], inputMatrix[1][1], inputMatrix[1][2],
+    inputMatrix[2][0], inputMatrix[2][1], inputMatrix[2][2]
+  ].map(Number);
+  return this;
+}
+
+/**
+ * Transforms the image using brightness, saturation, hue rotation, and lightness.
+ * Brightness and lightness both operate on luminance, with the difference being that
+ * brightness is multiplicative whereas lightness is additive.
+ *
+ * @since 0.22.1
+ *
+ * @example
+ * // increase brightness by a factor of 2
+ * const output = await sharp(input)
+ *   .modulate({
+ *     brightness: 2
+ *   })
+ *   .toBuffer();
+ *
+ * @example
+ * // hue-rotate by 180 degrees
+ * const output = await sharp(input)
+ *   .modulate({
+ *     hue: 180
+ *   })
+ *   .toBuffer();
+ *
+ * @example
+ * // increase lightness by +50
+ * const output = await sharp(input)
+ *   .modulate({
+ *     lightness: 50
+ *   })
+ *   .toBuffer();
+ *
+ * @example
+ * // decreate brightness and saturation while also hue-rotating by 90 degrees
+ * const output = await sharp(input)
+ *   .modulate({
+ *     brightness: 0.5,
+ *     saturation: 0.5,
+ *     hue: 90,
+ *   })
+ *   .toBuffer();
+ *
+ * @param {Object} [options]
+ * @param {number} [options.brightness] Brightness multiplier
+ * @param {number} [options.saturation] Saturation multiplier
+ * @param {number} [options.hue] Degrees for hue rotation
+ * @param {number} [options.lightness] Lightness addend
+ * @returns {Sharp}
+ */
+function modulate (options) {
+  if (!is.plainObject(options)) {
+    throw is.invalidParameterError('options', 'plain object', options);
+  }
+  if ('brightness' in options) {
+    if (is.number(options.brightness) && options.brightness >= 0) {
+      this.options.brightness = options.brightness;
+    } else {
+      throw is.invalidParameterError('brightness', 'number above zero', options.brightness);
+    }
+  }
+  if ('saturation' in options) {
+    if (is.number(options.saturation) && options.saturation >= 0) {
+      this.options.saturation = options.saturation;
+    } else {
+      throw is.invalidParameterError('saturation', 'number above zero', options.saturation);
+    }
+  }
+  if ('hue' in options) {
+    if (is.integer(options.hue)) {
+      this.options.hue = options.hue % 360;
+    } else {
+      throw is.invalidParameterError('hue', 'number', options.hue);
+    }
+  }
+  if ('lightness' in options) {
+    if (is.number(options.lightness)) {
+      this.options.lightness = options.lightness;
+    } else {
+      throw is.invalidParameterError('lightness', 'number', options.lightness);
+    }
+  }
   return this;
 }
 
@@ -458,26 +826,25 @@ function linear (a, b) {
  * @private
  */
 module.exports = function (Sharp) {
-  [
+  Object.assign(Sharp.prototype, {
     rotate,
-    extract,
     flip,
     flop,
+    affine,
     sharpen,
     median,
     blur,
-    extend,
     flatten,
-    trim,
     gamma,
     negate,
     normalise,
     normalize,
+    clahe,
     convolve,
     threshold,
     boolean,
-    linear
+    linear,
-  ].forEach(function (f) {
+    recomb,
-    Sharp.prototype[f.name] = f;
+    modulate
   });
 };

lib/platform.js

@@ -1,15 +1,27 @@
 'use strict';
 
-module.exports = function () {
+const detectLibc = require('detect-libc');
-  const arch = process.env.npm_config_arch || process.arch;
-  const platform = process.env.npm_config_platform || process.platform;
 
-  const platformId = [platform];
+const env = process.env;
-  if (arch === 'arm' || arch === 'armhf' || arch === 'arm64') {
+
-    const armVersion = (arch === 'arm64') ? '8' : process.env.npm_config_armv || process.config.variables.arm_version || '6';
+module.exports = function () {
-    platformId.push(`armv${armVersion}`);
+  const arch = env.npm_config_arch || process.arch;
+  const platform = env.npm_config_platform || process.platform;
+  const libc = process.env.npm_config_libc ||
+    /* istanbul ignore next */
+    (detectLibc.isNonGlibcLinuxSync() ? detectLibc.familySync() : '');
+  const libcId = platform !== 'linux' || libc === detectLibc.GLIBC ? '' : libc;
+
+  const platformId = [`${platform}${libcId}`];
+
+  if (arch === 'arm') {
+    const fallback = process.versions.electron ? '7' : '6';
+    platformId.push(`armv${env.npm_config_arm_version || process.config.variables.arm_version || fallback}`);
+  } else if (arch === 'arm64') {
+    platformId.push(`arm64v${env.npm_config_arm_version || '8'}`);
   } else {
     platformId.push(arch);
   }
+
   return platformId.join('-');
 };

lib/resize.js

@@ -3,7 +3,7 @@
 const is = require('./is');
 
 /**
- * Weighting to apply to image crop.
+ * Weighting to apply when using contain/cover fit.
  * @member
  * @private
  */
@@ -21,7 +21,23 @@ const gravity = {
 };
 
 /**
- * Strategies for automagic crop behaviour.
+ * Position to apply when using contain/cover fit.
+ * @member
+ * @private
+ */
+const position = {
+  top: 1,
+  right: 2,
+  bottom: 3,
+  left: 4,
+  'right top': 5,
+  'right bottom': 6,
+  'left bottom': 7,
+  'left top': 8
+};
+
+/**
+ * Strategies for automagic cover behaviour.
  * @member
  * @private
  */
@@ -38,45 +54,191 @@ const strategy = {
 const kernel = {
   nearest: 'nearest',
   cubic: 'cubic',
+  mitchell: 'mitchell',
   lanczos2: 'lanczos2',
   lanczos3: 'lanczos3'
 };
 
 /**
- * Resize image to `width` x `height`.
+ * Methods by which an image can be resized to fit the provided dimensions.
- * By default, the resized image is centre cropped to the exact size specified.
+ * @member
+ * @private
+ */
+const fit = {
+  contain: 'contain',
+  cover: 'cover',
+  fill: 'fill',
+  inside: 'inside',
+  outside: 'outside'
+};
+
+/**
+ * Map external fit property to internal canvas property.
+ * @member
+ * @private
+ */
+const mapFitToCanvas = {
+  contain: 'embed',
+  cover: 'crop',
+  fill: 'ignore_aspect',
+  inside: 'max',
+  outside: 'min'
+};
+
+/**
+ * @private
+ */
+function isRotationExpected (options) {
+  return (options.angle % 360) !== 0 || options.useExifOrientation === true || options.rotationAngle !== 0;
+}
+
+/**
+ * @private
+ */
+function isResizeExpected (options) {
+  return options.width !== -1 || options.height !== -1;
+}
+
+/**
+ * Resize image to `width`, `height` or `width x height`.
  *
- * Possible kernels are:
+ * When both a `width` and `height` are provided, the possible methods by which the image should **fit** these are:
+ * - `cover`: (default) Preserving aspect ratio, ensure the image covers both provided dimensions by cropping/clipping to fit.
+ * - `contain`: Preserving aspect ratio, contain within both provided dimensions using "letterboxing" where necessary.
+ * - `fill`: Ignore the aspect ratio of the input and stretch to both provided dimensions.
+ * - `inside`: Preserving aspect ratio, resize the image to be as large as possible while ensuring its dimensions are less than or equal to both those specified.
+ * - `outside`: Preserving aspect ratio, resize the image to be as small as possible while ensuring its dimensions are greater than or equal to both those specified.
+ *
+ * Some of these values are based on the [object-fit](https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit) CSS property.
+ *
+ * <img alt="Examples of various values for the fit property when resizing" width="100%" style="aspect-ratio: 998/243" src="https://cdn.jsdelivr.net/gh/lovell/sharp@main/docs/image/api-resize-fit.png">
+ *
+ * When using a **fit** of `cover` or `contain`, the default **position** is `centre`. Other options are:
+ * - `sharp.position`: `top`, `right top`, `right`, `right bottom`, `bottom`, `left bottom`, `left`, `left top`.
+ * - `sharp.gravity`: `north`, `northeast`, `east`, `southeast`, `south`, `southwest`, `west`, `northwest`, `center` or `centre`.
+ * - `sharp.strategy`: `cover` only, dynamically crop using either the `entropy` or `attention` strategy.
+ *
+ * Some of these values are based on the [object-position](https://developer.mozilla.org/en-US/docs/Web/CSS/object-position) CSS property.
+ *
+ * The experimental strategy-based approach resizes so one dimension is at its target length
+ * then repeatedly ranks edge regions, discarding the edge with the lowest score based on the selected strategy.
+ * - `entropy`: focus on the region with the highest [Shannon entropy](https://en.wikipedia.org/wiki/Entropy_%28information_theory%29).
+ * - `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
+ *
+ * Possible interpolation kernels are:
  * - `nearest`: Use [nearest neighbour interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation).
  * - `cubic`: Use a [Catmull-Rom spline](https://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline).
+ * - `mitchell`: Use a [Mitchell-Netravali spline](https://www.cs.utexas.edu/~fussell/courses/cs384g-fall2013/lectures/mitchell/Mitchell.pdf).
  * - `lanczos2`: Use a [Lanczos kernel](https://en.wikipedia.org/wiki/Lanczos_resampling#Lanczos_kernel) with `a=2`.
  * - `lanczos3`: Use a Lanczos kernel with `a=3` (the default).
  *
+ * Only one resize can occur per pipeline.
+ * Previous calls to `resize` in the same pipeline will be ignored.
+ *
  * @example
- * sharp(inputBuffer)
+ * sharp(input)
- *   .resize(200, 300, {
+ *   .resize({ width: 100 })
- *     kernel: sharp.kernel.nearest
+ *   .toBuffer()
- *   })
+ *   .then(data => {
- *   .background('white')
+ *     // 100 pixels wide, auto-scaled height
- *   .embed()
- *   .toFile('output.tiff')
- *   .then(function() {
- *     // output.tiff is a 200 pixels wide and 300 pixels high image
- *     // containing a nearest-neighbour scaled version, embedded on a white canvas,
- *     // of the image data in inputBuffer
  *   });
  *
- * @param {Number} [width] - pixels wide the resultant image should be. Use `null` or `undefined` to auto-scale the width to match the height.
+ * @example
- * @param {Number} [height] - pixels high the resultant image should be. Use `null` or `undefined` to auto-scale the height to match the width.
+ * sharp(input)
+ *   .resize({ height: 100 })
+ *   .toBuffer()
+ *   .then(data => {
+ *     // 100 pixels high, auto-scaled width
+ *   });
+ *
+ * @example
+ * sharp(input)
+ *   .resize(200, 300, {
+ *     kernel: sharp.kernel.nearest,
+ *     fit: 'contain',
+ *     position: 'right top',
+ *     background: { r: 255, g: 255, b: 255, alpha: 0.5 }
+ *   })
+ *   .toFile('output.png')
+ *   .then(() => {
+ *     // output.png is a 200 pixels wide and 300 pixels high image
+ *     // containing a nearest-neighbour scaled version
+ *     // contained within the north-east corner of a semi-transparent white canvas
+ *   });
+ *
+ * @example
+ * const transformer = sharp()
+ *   .resize({
+ *     width: 200,
+ *     height: 200,
+ *     fit: sharp.fit.cover,
+ *     position: sharp.strategy.entropy
+ *   });
+ * // Read image data from readableStream
+ * // Write 200px square auto-cropped image data to writableStream
+ * readableStream
+ *   .pipe(transformer)
+ *   .pipe(writableStream);
+ *
+ * @example
+ * sharp(input)
+ *   .resize(200, 200, {
+ *     fit: sharp.fit.inside,
+ *     withoutEnlargement: true
+ *   })
+ *   .toFormat('jpeg')
+ *   .toBuffer()
+ *   .then(function(outputBuffer) {
+ *     // outputBuffer contains JPEG image data
+ *     // no wider and no higher than 200 pixels
+ *     // and no larger than the input image
+ *   });
+ *
+ * @example
+ * sharp(input)
+ *   .resize(200, 200, {
+ *     fit: sharp.fit.outside,
+ *     withoutReduction: true
+ *   })
+ *   .toFormat('jpeg')
+ *   .toBuffer()
+ *   .then(function(outputBuffer) {
+ *     // outputBuffer contains JPEG image data
+ *     // of at least 200 pixels wide and 200 pixels high while maintaining aspect ratio
+ *     // and no smaller than the input image
+ *   });
+ *
+ * @example
+ * const scaleByHalf = await sharp(input)
+ *   .metadata()
+ *   .then(({ width }) => sharp(input)
+ *     .resize(Math.round(width * 0.5))
+ *     .toBuffer()
+ *   );
+ *
+ * @param {number} [width] - pixels wide the resultant image should be. Use `null` or `undefined` to auto-scale the width to match the height.
+ * @param {number} [height] - pixels high the resultant image should be. Use `null` or `undefined` to auto-scale the height to match the width.
  * @param {Object} [options]
+ * @param {String} [options.width] - alternative means of specifying `width`. If both are present this takes priority.
+ * @param {String} [options.height] - alternative means of specifying `height`. If both are present this takes priority.
+ * @param {String} [options.fit='cover'] - how the image should be resized to fit both provided dimensions, one of `cover`, `contain`, `fill`, `inside` or `outside`.
+ * @param {String} [options.position='centre'] - position, gravity or strategy to use when `fit` is `cover` or `contain`.
+ * @param {String|Object} [options.background={r: 0, g: 0, b: 0, alpha: 1}] - background colour when `fit` is `contain`, parsed by the [color](https://www.npmjs.org/package/color) module, defaults to black without transparency.
  * @param {String} [options.kernel='lanczos3'] - the kernel to use for image reduction.
+ * @param {Boolean} [options.withoutEnlargement=false] - do not enlarge if the width *or* height are already less than the specified dimensions, equivalent to GraphicsMagick's `>` geometry option.
+ * @param {Boolean} [options.withoutReduction=false] - do not reduce if the width *or* height are already greater than the specified dimensions, equivalent to GraphicsMagick's `<` geometry option.
  * @param {Boolean} [options.fastShrinkOnLoad=true] - take greater advantage of the JPEG and WebP shrink-on-load feature, which can lead to a slight moiré pattern on some images.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
 function resize (width, height, options) {
+  if (isResizeExpected(this.options)) {
+    this.options.debuglog('ignoring previous resize options');
+  }
   if (is.defined(width)) {
-    if (is.integer(width) && width > 0) {
+    if (is.object(width) && !is.defined(options)) {
+      options = width;
+    } else if (is.integer(width) && width > 0) {
       this.options.width = width;
     } else {
       throw is.invalidParameterError('width', 'positive integer', width);
@@ -94,6 +256,44 @@ function resize (width, height, options) {
     this.options.height = -1;
   }
   if (is.object(options)) {
+    // Width
+    if (is.defined(options.width)) {
+      if (is.integer(options.width) && options.width > 0) {
+        this.options.width = options.width;
+      } else {
+        throw is.invalidParameterError('width', 'positive integer', options.width);
+      }
+    }
+    // Height
+    if (is.defined(options.height)) {
+      if (is.integer(options.height) && options.height > 0) {
+        this.options.height = options.height;
+      } else {
+        throw is.invalidParameterError('height', 'positive integer', options.height);
+      }
+    }
+    // Fit
+    if (is.defined(options.fit)) {
+      const canvas = mapFitToCanvas[options.fit];
+      if (is.string(canvas)) {
+        this.options.canvas = canvas;
+      } else {
+        throw is.invalidParameterError('fit', 'valid fit', options.fit);
+      }
+    }
+    // Position
+    if (is.defined(options.position)) {
+      const pos = is.integer(options.position)
+        ? options.position
+        : strategy[options.position] || position[options.position] || gravity[options.position];
+      if (is.integer(pos) && (is.inRange(pos, 0, 8) || is.inRange(pos, 16, 17))) {
+        this.options.position = pos;
+      } else {
+        throw is.invalidParameterError('position', 'valid position/gravity/strategy', options.position);
+      }
+    }
+    // Background
+    this._setBackgroundColourOption('resizeBackground', options.background);
     // Kernel
     if (is.defined(options.kernel)) {
       if (is.string(kernel[options.kernel])) {
@@ -102,166 +302,230 @@ function resize (width, height, options) {
         throw is.invalidParameterError('kernel', 'valid kernel name', options.kernel);
       }
     }
+    // Without enlargement
+    if (is.defined(options.withoutEnlargement)) {
+      this._setBooleanOption('withoutEnlargement', options.withoutEnlargement);
+    }
+    // Without reduction
+    if (is.defined(options.withoutReduction)) {
+      this._setBooleanOption('withoutReduction', options.withoutReduction);
+    }
     // Shrink on load
     if (is.defined(options.fastShrinkOnLoad)) {
       this._setBooleanOption('fastShrinkOnLoad', options.fastShrinkOnLoad);
     }
   }
+  if (isRotationExpected(this.options) && isResizeExpected(this.options)) {
+    this.options.rotateBeforePreExtract = true;
+  }
+  return this;
+}
+
+/**
+ * Extends/pads the edges of the image with the provided background colour.
+ * This operation will always occur after resizing and extraction, if any.
+ *
+ * @example
+ * // Resize to 140 pixels wide, then add 10 transparent pixels
+ * // to the top, left and right edges and 20 to the bottom edge
+ * sharp(input)
+ *   .resize(140)
+ *   .extend({
+ *     top: 10,
+ *     bottom: 20,
+ *     left: 10,
+ *     right: 10,
+ *     background: { r: 0, g: 0, b: 0, alpha: 0 }
+ *   })
+ *   ...
+ *
+* @example
+ * // Add a row of 10 red pixels to the bottom
+ * sharp(input)
+ *   .extend({
+ *     bottom: 10,
+ *     background: 'red'
+ *   })
+ *   ...
+ *
+ * @param {(number|Object)} extend - single pixel count to add to all edges or an Object with per-edge counts
+ * @param {number} [extend.top=0]
+ * @param {number} [extend.left=0]
+ * @param {number} [extend.bottom=0]
+ * @param {number} [extend.right=0]
+ * @param {String|Object} [extend.background={r: 0, g: 0, b: 0, alpha: 1}] - background colour, parsed by the [color](https://www.npmjs.org/package/color) module, defaults to black without transparency.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+*/
+function extend (extend) {
+  if (is.integer(extend) && extend > 0) {
+    this.options.extendTop = extend;
+    this.options.extendBottom = extend;
+    this.options.extendLeft = extend;
+    this.options.extendRight = extend;
+  } else if (is.object(extend)) {
+    if (is.defined(extend.top)) {
+      if (is.integer(extend.top) && extend.top >= 0) {
+        this.options.extendTop = extend.top;
+      } else {
+        throw is.invalidParameterError('top', 'positive integer', extend.top);
+      }
+    }
+    if (is.defined(extend.bottom)) {
+      if (is.integer(extend.bottom) && extend.bottom >= 0) {
+        this.options.extendBottom = extend.bottom;
+      } else {
+        throw is.invalidParameterError('bottom', 'positive integer', extend.bottom);
+      }
+    }
+    if (is.defined(extend.left)) {
+      if (is.integer(extend.left) && extend.left >= 0) {
+        this.options.extendLeft = extend.left;
+      } else {
+        throw is.invalidParameterError('left', 'positive integer', extend.left);
+      }
+    }
+    if (is.defined(extend.right)) {
+      if (is.integer(extend.right) && extend.right >= 0) {
+        this.options.extendRight = extend.right;
+      } else {
+        throw is.invalidParameterError('right', 'positive integer', extend.right);
+      }
+    }
+    this._setBackgroundColourOption('extendBackground', extend.background);
+  } else {
+    throw is.invalidParameterError('extend', 'integer or object', extend);
+  }
+  return this;
+}
+
+/**
+ * Extract/crop a region of the image.
+ *
+ * - Use `extract` before `resize` for pre-resize extraction.
+ * - Use `extract` after `resize` for post-resize extraction.
+ * - Use `extract` before and after for both.
+ *
+ * @example
+ * sharp(input)
+ *   .extract({ left: left, top: top, width: width, height: height })
+ *   .toFile(output, function(err) {
+ *     // Extract a region of the input image, saving in the same format.
+ *   });
+ * @example
+ * sharp(input)
+ *   .extract({ left: leftOffsetPre, top: topOffsetPre, width: widthPre, height: heightPre })
+ *   .resize(width, height)
+ *   .extract({ left: leftOffsetPost, top: topOffsetPost, width: widthPost, height: heightPost })
+ *   .toFile(output, function(err) {
+ *     // Extract a region, resize, then extract from the resized image
+ *   });
+ *
+ * @param {Object} options - describes the region to extract using integral pixel values
+ * @param {number} options.left - zero-indexed offset from left edge
+ * @param {number} options.top - zero-indexed offset from top edge
+ * @param {number} options.width - width of region to extract
+ * @param {number} options.height - height of region to extract
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function extract (options) {
+  const suffix = isResizeExpected(this.options) || this.options.widthPre !== -1 ? 'Post' : 'Pre';
+  if (this.options[`width${suffix}`] !== -1) {
+    this.options.debuglog('ignoring previous extract options');
+  }
+  ['left', 'top', 'width', 'height'].forEach(function (name) {
+    const value = options[name];
+    if (is.integer(value) && value >= 0) {
+      this.options[name + (name === 'left' || name === 'top' ? 'Offset' : '') + suffix] = value;
+    } else {
+      throw is.invalidParameterError(name, 'integer', value);
+    }
+  }, this);
+  // Ensure existing rotation occurs before pre-resize extraction
+  if (isRotationExpected(this.options) && !isResizeExpected(this.options)) {
+    if (this.options.widthPre === -1 || this.options.widthPost === -1) {
+      this.options.rotateBeforePreExtract = true;
+    }
+  }
   return this;
 }
 
 /**
- * Crop the resized image to the exact size specified, the default behaviour.
+ * Trim pixels from all edges that contain values similar to the given background colour, which defaults to that of the top-left pixel.
  *
- * Possible attributes of the optional `sharp.gravity` are `north`, `northeast`, `east`, `southeast`, `south`,
+ * Images with an alpha channel will use the combined bounding box of alpha and non-alpha channels.
- * `southwest`, `west`, `northwest`, `center` and `centre`.
  *
- * The experimental strategy-based approach resizes so one dimension is at its target length
+ * If the result of this operation would trim an image to nothing then no change is made.
- * then repeatedly ranks edge regions, discarding the edge with the lowest score based on the selected strategy.
+ *
- * - `entropy`: focus on the region with the highest [Shannon entropy](https://en.wikipedia.org/wiki/Entropy_%28information_theory%29).
+ * The `info` response Object, obtained from callback of `.toFile()` or `.toBuffer()`,
- * - `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
+ * will contain `trimOffsetLeft` and `trimOffsetTop` properties.
  *
  * @example
- * const transformer = sharp()
+ * // Trim pixels with a colour similar to that of the top-left pixel.
- *   .resize(200, 200)
+ * sharp(input)
- *   .crop(sharp.strategy.entropy)
+ *   .trim()
- *   .on('error', function(err) {
+ *   .toFile(output, function(err, info) {
- *     console.log(err);
+ *     ...
+ *   });
+ * @example
+ * // Trim pixels with the exact same colour as that of the top-left pixel.
+ * sharp(input)
+ *   .trim(0)
+ *   .toFile(output, function(err, info) {
+ *     ...
+ *   });
+ * @example
+ * // Trim only pixels with a similar colour to red.
+ * sharp(input)
+ *   .trim("#FF0000")
+ *   .toFile(output, function(err, info) {
+ *     ...
+ *   });
+ * @example
+ * // Trim all "yellow-ish" pixels, being more lenient with the higher threshold.
+ * sharp(input)
+ *   .trim({
+ *     background: "yellow",
+ *     threshold: 42,
+ *   })
+ *   .toFile(output, function(err, info) {
+ *     ...
  *   });
- * // Read image data from readableStream
- * // Write 200px square auto-cropped image data to writableStream
- * readableStream.pipe(transformer).pipe(writableStream);
  *
- * @param {String} [crop='centre'] - A member of `sharp.gravity` to crop to an edge/corner or `sharp.strategy` to crop dynamically.
+ * @param {string|number|Object} trim - the specific background colour to trim, the threshold for doing so or an Object with both.
+ * @param {string|Object} [trim.background='top-left pixel'] - background colour, parsed by the [color](https://www.npmjs.org/package/color) module, defaults to that of the top-left pixel.
+ * @param {number} [trim.threshold=10] - the allowed difference from the above colour, a positive number.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
-function crop (crop) {
+function trim (trim) {
-  this.options.canvas = 'crop';
+  if (!is.defined(trim)) {
-  if (!is.defined(crop)) {
+    this.options.trimThreshold = 10;
-    // Default
+  } else if (is.string(trim)) {
-    this.options.crop = gravity.center;
+    this._setBackgroundColourOption('trimBackground', trim);
-  } else if (is.integer(crop) && is.inRange(crop, 0, 8)) {
+    this.options.trimThreshold = 10;
-    // Gravity (numeric)
+  } else if (is.number(trim)) {
-    this.options.crop = crop;
+    if (trim >= 0) {
-  } else if (is.string(crop) && is.integer(gravity[crop])) {
+      this.options.trimThreshold = trim;
-    // Gravity (string)
+    } else {
-    this.options.crop = gravity[crop];
+      throw is.invalidParameterError('threshold', 'positive number', trim);
-  } else if (is.integer(crop) && crop >= strategy.entropy) {
+    }
-    // Strategy
+  } else if (is.object(trim)) {
-    this.options.crop = crop;
+    this._setBackgroundColourOption('trimBackground', trim.background);
-  } else if (is.string(crop) && is.integer(strategy[crop])) {
+    if (!is.defined(trim.threshold)) {
-    // Strategy (string)
+      this.options.trimThreshold = 10;
-    this.options.crop = strategy[crop];
+    } else if (is.number(trim.threshold) && trim.threshold >= 0) {
+      this.options.trimThreshold = trim.threshold;
+    } else {
+      throw is.invalidParameterError('threshold', 'positive number', trim);
+    }
   } else {
-    throw is.invalidParameterError('crop', 'valid crop id/name/strategy', crop);
+    throw is.invalidParameterError('trim', 'string, number or object', trim);
   }
-  return this;
+  if (isRotationExpected(this.options)) {
-}
+    this.options.rotateBeforePreExtract = true;
-
-/**
- * Preserving aspect ratio, resize the image to the maximum `width` or `height` specified
- * then embed on a background of the exact `width` and `height` specified.
- *
- * If the background contains an alpha value then WebP and PNG format output images will
- * contain an alpha channel, even when the input image does not.
- *
- * @example
- * sharp('input.gif')
- *   .resize(200, 300)
- *   .background({r: 0, g: 0, b: 0, alpha: 0})
- *   .embed()
- *   .toFormat(sharp.format.webp)
- *   .toBuffer(function(err, outputBuffer) {
- *     if (err) {
- *       throw err;
- *     }
- *     // outputBuffer contains WebP image data of a 200 pixels wide and 300 pixels high
- *     // containing a scaled version, embedded on a transparent canvas, of input.gif
- *   });
- * @param {String} [embed='centre'] - A member of `sharp.gravity` to embed to an edge/corner.
- * @returns {Sharp}
- * @throws {Error} Invalid parameters
- */
-function embed (embed) {
-  this.options.canvas = 'embed';
-
-  if (!is.defined(embed)) {
-    // Default
-    this.options.embed = gravity.center;
-  } else if (is.integer(embed) && is.inRange(embed, 0, 8)) {
-    // Gravity (numeric)
-    this.options.embed = embed;
-  } else if (is.string(embed) && is.integer(gravity[embed])) {
-    // Gravity (string)
-    this.options.embed = gravity[embed];
-  } else {
-    throw is.invalidParameterError('embed', 'valid embed id/name', embed);
   }
-
-  return this;
-}
-
-/**
- * Preserving aspect ratio, resize the image to be as large as possible
- * while ensuring its dimensions are less than or equal to the `width` and `height` specified.
- *
- * Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
- *
- * @example
- * sharp(inputBuffer)
- *   .resize(200, 200)
- *   .max()
- *   .toFormat('jpeg')
- *   .toBuffer()
- *   .then(function(outputBuffer) {
- *     // outputBuffer contains JPEG image data no wider than 200 pixels and no higher
- *     // than 200 pixels regardless of the inputBuffer image dimensions
- *   });
- *
- * @returns {Sharp}
- */
-function max () {
-  this.options.canvas = 'max';
-  return this;
-}
-
-/**
- * Preserving aspect ratio, resize the image to be as small as possible
- * while ensuring its dimensions are greater than or equal to the `width` and `height` specified.
- *
- * Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
- *
- * @returns {Sharp}
- */
-function min () {
-  this.options.canvas = 'min';
-  return this;
-}
-
-/**
- * Ignoring the aspect ratio of the input, stretch the image to
- * the exact `width` and/or `height` provided via `resize`.
- * @returns {Sharp}
- */
-function ignoreAspectRatio () {
-  this.options.canvas = 'ignore_aspect';
-  return this;
-}
-
-/**
- * Do not enlarge the output image if the input image width *or* height are already less than the required dimensions.
- * This is equivalent to GraphicsMagick's `>` geometry option:
- * "*change the dimensions of the image only if its width or height exceeds the geometry specification*".
- * Use with `max()` to preserve the image's aspect ratio.
- *
- * The default behaviour *before* function call is `false`, meaning the image will be enlarged.
- *
- * @param {Boolean} [withoutEnlargement=true]
- * @returns {Sharp}
-*/
-function withoutEnlargement (withoutEnlargement) {
-  this.options.withoutEnlargement = is.bool(withoutEnlargement) ? withoutEnlargement : true;
   return this;
 }
 
@@ -270,19 +534,16 @@ function withoutEnlargement (withoutEnlargement) {
  * @private
  */
 module.exports = function (Sharp) {
-  [
+  Object.assign(Sharp.prototype, {
     resize,
-    crop,
+    extend,
-    embed,
+    extract,
-    max,
+    trim
-    min,
-    ignoreAspectRatio,
-    withoutEnlargement
-  ].forEach(function (f) {
-    Sharp.prototype[f.name] = f;
   });
   // Class attributes
   Sharp.gravity = gravity;
   Sharp.strategy = strategy;
   Sharp.kernel = kernel;
+  Sharp.fit = fit;
+  Sharp.position = position;
 };

lib/sharp.js

@@ -0,0 +1,35 @@
+'use strict';
+
+const platformAndArch = require('./platform')();
+
+/* istanbul ignore next */
+try {
+  module.exports = require(`../build/Release/sharp-${platformAndArch}.node`);
+} catch (err) {
+  // Bail early if bindings aren't available
+  const help = ['', 'Something went wrong installing the "sharp" module', '', err.message, '', 'Possible solutions:'];
+  if (/dylib/.test(err.message) && /Incompatible library version/.test(err.message)) {
+    help.push('- Update Homebrew: "brew update && brew upgrade vips"');
+  } else {
+    const [platform, arch] = platformAndArch.split('-');
+    if (platform === 'linux' && /Module did not self-register/.test(err.message)) {
+      help.push('- Using worker threads? See https://sharp.pixelplumbing.com/install#worker-threads');
+    }
+    help.push(
+      '- Install with verbose logging and look for errors: "npm install --ignore-scripts=false --foreground-scripts --verbose sharp"',
+      `- Install for the current ${platformAndArch} runtime: "npm install --platform=${platform} --arch=${arch} sharp"`
+    );
+  }
+  help.push(
+    '- Consult the installation documentation: https://sharp.pixelplumbing.com/install'
+  );
+  // Check loaded
+  if (process.platform === 'win32' || /symbol/.test(err.message)) {
+    const loadedModule = Object.keys(require.cache).find((i) => /[\\/]build[\\/]Release[\\/]sharp(.*)\.node$/.test(i));
+    if (loadedModule) {
+      const [, loadedPackage] = loadedModule.match(/node_modules[\\/]([^\\/]+)[\\/]/);
+      help.push(`- Ensure the version of sharp aligns with the ${loadedPackage} package: "npm ls sharp"`);
+    }
+  }
+  throw new Error(help.join('\n'));
+}

lib/utility.js

@@ -1,7 +1,74 @@
 'use strict';
 
+const fs = require('fs');
+const path = require('path');
+const events = require('events');
+const detectLibc = require('detect-libc');
+
 const is = require('./is');
-const sharp = require('../build/Release/sharp.node');
+const platformAndArch = require('./platform')();
+const sharp = require('./sharp');
+
+/**
+ * An Object containing nested boolean values representing the available input and output formats/methods.
+ * @member
+ * @example
+ * console.log(sharp.format);
+ * @returns {Object}
+ */
+const format = sharp.format();
+format.heif.output.alias = ['avif', 'heic'];
+format.jpeg.output.alias = ['jpe', 'jpg'];
+format.tiff.output.alias = ['tif'];
+format.jp2k.output.alias = ['j2c', 'j2k', 'jp2', 'jpx'];
+
+/**
+ * An Object containing the available interpolators and their proper values
+ * @readonly
+ * @enum {string}
+ */
+const interpolators = {
+  /** [Nearest neighbour interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation). Suitable for image enlargement only. */
+  nearest: 'nearest',
+  /** [Bilinear interpolation](http://en.wikipedia.org/wiki/Bilinear_interpolation). Faster than bicubic but with less smooth results. */
+  bilinear: 'bilinear',
+  /** [Bicubic interpolation](http://en.wikipedia.org/wiki/Bicubic_interpolation) (the default). */
+  bicubic: 'bicubic',
+  /** [LBB interpolation](https://github.com/libvips/libvips/blob/master/libvips/resample/lbb.cpp#L100). Prevents some "[acutance](http://en.wikipedia.org/wiki/Acutance)" but typically reduces performance by a factor of 2. */
+  locallyBoundedBicubic: 'lbb',
+  /** [Nohalo interpolation](http://eprints.soton.ac.uk/268086/). Prevents acutance but typically reduces performance by a factor of 3. */
+  nohalo: 'nohalo',
+  /** [VSQBS interpolation](https://github.com/libvips/libvips/blob/master/libvips/resample/vsqbs.cpp#L48). Prevents "staircasing" when enlarging. */
+  vertexSplitQuadraticBasisSpline: 'vsqbs'
+};
+
+/**
+ * An Object containing the version numbers of libvips and its dependencies.
+ * @member
+ * @example
+ * console.log(sharp.versions);
+ */
+let versions = {
+  vips: sharp.libvipsVersion()
+};
+try {
+  versions = require(`../vendor/${versions.vips}/${platformAndArch}/versions.json`);
+} catch (_err) { /* ignore */ }
+
+/**
+ * An Object containing the platform and architecture
+ * of the current and installed vendored binaries.
+ * @member
+ * @example
+ * console.log(sharp.vendor);
+ */
+const vendor = {
+  current: platformAndArch,
+  installed: []
+};
+try {
+  vendor.installed = fs.readdirSync(path.join(__dirname, `../vendor/${versions.vips}`));
+} catch (_err) { /* ignore */ }
 
 /**
  * Gets or, when options are provided, sets the limits of _libvips'_ operation cache.
@@ -16,10 +83,10 @@ const sharp = require('../build/Release/sharp.node');
  * sharp.cache( { files: 0 } );
  * sharp.cache(false);
  *
- * @param {Object|Boolean} [options=true] - Object with the following attributes, or Boolean where true uses default cache settings and false removes all caching
+ * @param {Object|boolean} [options=true] - Object with the following attributes, or boolean where true uses default cache settings and false removes all caching
- * @param {Number} [options.memory=50] - is the maximum memory in MB to use for this cache
+ * @param {number} [options.memory=50] - is the maximum memory in MB to use for this cache
- * @param {Number} [options.files=20] - is the maximum number of files to hold open
+ * @param {number} [options.files=20] - is the maximum number of files to hold open
- * @param {Number} [options.items=100] - is the maximum number of operations to cache
+ * @param {number} [options.items=100] - is the maximum number of operations to cache
  * @returns {Object}
  */
 function cache (options) {
@@ -40,26 +107,60 @@ cache(true);
 
 /**
  * Gets or, when a concurrency is provided, sets
- * the number of threads _libvips'_ should create to process each image.
+ * the maximum number of threads _libvips_ should use to process _each image_.
- * The default value is the number of CPU cores.
+ * These are from a thread pool managed by glib,
- * A value of `0` will reset to this default.
+ * which helps avoid the overhead of creating new threads.
- *
- * The maximum number of images that can be processed in parallel
- * is limited by libuv's `UV_THREADPOOL_SIZE` environment variable.
  *
  * This method always returns the current concurrency.
  *
+ * The default value is the number of CPU cores,
+ * except when using glibc-based Linux without jemalloc,
+ * where the default is `1` to help reduce memory fragmentation.
+ *
+ * A value of `0` will reset this to the number of CPU cores.
+ *
+ * Some image format libraries spawn additional threads,
+ * e.g. libaom manages its own 4 threads when encoding AVIF images,
+ * and these are independent of the value set here.
+ *
+ * The maximum number of images that sharp can process in parallel
+ * is controlled by libuv's `UV_THREADPOOL_SIZE` environment variable,
+ * which defaults to 4.
+ *
+ * https://nodejs.org/api/cli.html#uv_threadpool_sizesize
+ *
+ * For example, by default, a machine with 8 CPU cores will process
+ * 4 images in parallel and use up to 8 threads per image,
+ * so there will be up to 32 concurrent threads.
+ *
  * @example
  * const threads = sharp.concurrency(); // 4
  * sharp.concurrency(2); // 2
  * sharp.concurrency(0); // 4
  *
- * @param {Number} [concurrency]
+ * @param {number} [concurrency]
- * @returns {Number} concurrency
+ * @returns {number} concurrency
  */
 function concurrency (concurrency) {
   return sharp.concurrency(is.integer(concurrency) ? concurrency : null);
 }
+/* istanbul ignore next */
+if (detectLibc.familySync() === detectLibc.GLIBC && !sharp._isUsingJemalloc()) {
+  // Reduce default concurrency to 1 when using glibc memory allocator
+  sharp.concurrency(1);
+}
+
+/**
+ * An EventEmitter that emits a `change` event when a task is either:
+ * - queued, waiting for _libuv_ to provide a worker thread
+ * - complete
+ * @member
+ * @example
+ * sharp.queue.on('change', function(queueLength) {
+ *   console.log('Queue contains ' + queueLength + ' task(s)');
+ * });
+ */
+const queue = new events.EventEmitter();
 
 /**
  * Provides access to internal task counters.
@@ -82,35 +183,33 @@ function counters () {
  * Improves the performance of `resize`, `blur` and `sharpen` operations
  * by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM NEON.
  *
- * This feature is currently off by default but future versions may reverse this.
- * Versions of liborc prior to 0.4.25 are known to segfault under heavy load.
- *
  * @example
  * const simd = sharp.simd();
- * // simd is `true` if SIMD is currently enabled
+ * // simd is `true` if the runtime use of liborc is currently enabled
  * @example
- * const simd = sharp.simd(true);
+ * const simd = sharp.simd(false);
- * // attempts to enable the use of SIMD, returning true if available
+ * // prevent libvips from using liborc at runtime
  *
- * @param {Boolean} [simd=false]
+ * @param {boolean} [simd=true]
- * @returns {Boolean}
+ * @returns {boolean}
  */
 function simd (simd) {
   return sharp.simd(is.bool(simd) ? simd : null);
 }
-simd(false);
+simd(true);
 
 /**
  * Decorate the Sharp class with utility-related functions.
  * @private
  */
 module.exports = function (Sharp) {
-  [
+  Sharp.cache = cache;
-    cache,
+  Sharp.concurrency = concurrency;
-    concurrency,
+  Sharp.counters = counters;
-    counters,
+  Sharp.simd = simd;
-    simd
+  Sharp.format = format;
-  ].forEach(function (f) {
+  Sharp.interpolators = interpolators;
-    Sharp[f.name] = f;
+  Sharp.versions = versions;
-  });
+  Sharp.vendor = vendor;
+  Sharp.queue = queue;
 };

mkdocs.yml

@@ -1,27 +0,0 @@
-site_name: sharp
-site_url: http://sharp.pixelplumbing.com/
-repo_url: https://github.com/lovell/sharp
-site_description: High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images
-copyright: <a href="https://pixelplumbing.com/">pixelplumbing.com</a>
-google_analytics: ['UA-13034748-12', 'sharp.pixelplumbing.com']
-theme: readthedocs
-extra_css:
-  - css/extra.css
-markdown_extensions:
-  - toc:
-      permalink: True
-pages:
-  - Home: index.md
-  - Installation: install.md
-  - API:
-    - Constructor: api-constructor.md
-    - Input: api-input.md
-    - Output: api-output.md
-    - "Resizing images": api-resize.md
-    - "Compositing images": api-composite.md
-    - "Image operations": api-operation.md
-    - "Colour manipulation": api-colour.md
-    - "Channel manipulation": api-channel.md
-    - Utilities: api-utility.md
-  - Performance: performance.md
-  - Changelog: changelog.md

package.json

@@ -1,7 +1,7 @@
 {
   "name": "sharp",
-  "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images",
+  "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP, GIF, AVIF and TIFF images",
-  "version": "0.20.6",
+  "version": "0.31.3",
   "author": "Lovell Fuller <npm@lovell.info>",
   "homepage": "https://github.com/lovell/sharp",
   "contributors": [
@@ -52,17 +52,60 @@
     "Tom Lokhorst <tom@lokhorst.eu>",
     "Espen Hovlandsdal <espen@hovlandsdal.com>",
     "Sylvain Dumont <sylvain.dumont35@gmail.com>",
-    "Alun Davies <alun.owain.davies@googlemail.com>"
+    "Alun Davies <alun.owain.davies@googlemail.com>",
+    "Aidan Hoolachan <ajhoolachan21@gmail.com>",
+    "Axel Eirola <axel.eirola@iki.fi>",
+    "Freezy <freezy@xbmc.org>",
+    "Daiz <taneli.vatanen@gmail.com>",
+    "Julian Aubourg <j@ubourg.net>",
+    "Keith Belovay <keith@picthrive.com>",
+    "Michael B. Klein <mbklein@gmail.com>",
+    "Jordan Prudhomme <jordan@raboland.fr>",
+    "Ilya Ovdin <iovdin@gmail.com>",
+    "Andargor <andargor@yahoo.com>",
+    "Paul Neave <paul.neave@gmail.com>",
+    "Brendan Kennedy <brenwken@gmail.com>",
+    "Brychan Bennett-Odlum <git@brychan.io>",
+    "Edward Silverton <e.silverton@gmail.com>",
+    "Roman Malieiev <aromaleev@gmail.com>",
+    "Tomas Szabo <tomas.szabo@deftomat.com>",
+    "Robert O'Rourke <robert@o-rourke.org>",
+    "Guillermo Alfonso Varela Chouciño <guillevch@gmail.com>",
+    "Christian Flintrup <chr@gigahost.dk>",
+    "Manan Jadhav <manan@motionden.com>",
+    "Leon Radley <leon@radley.se>",
+    "alza54 <alza54@thiocod.in>",
+    "Jacob Smith <jacob@frende.me>",
+    "Michael Nutt <michael@nutt.im>",
+    "Brad Parham <baparham@gmail.com>",
+    "Taneli Vatanen <taneli.vatanen@gmail.com>",
+    "Joris Dugué <zaruike10@gmail.com>",
+    "Chris Banks <christopher.bradley.banks@gmail.com>",
+    "Ompal Singh <ompal.hitm09@gmail.com>",
+    "Brodan <christopher.hranj@gmail.com",
+    "Ankur Parihar <ankur.github@gmail.com>",
+    "Brahim Ait elhaj <brahima@gmail.com>",
+    "Mart Jansink <m.jansink@gmail.com>"
   ],
   "scripts": {
-    "install": "(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)",
+    "install": "(node install/libvips && node install/dll-copy && prebuild-install) || (node install/can-compile && node-gyp rebuild && node install/dll-copy)",
-    "clean": "rm -rf node_modules/ build/ vendor/ coverage/ test/fixtures/output.*",
+    "clean": "rm -rf node_modules/ build/ vendor/ .nyc_output/ coverage/ test/fixtures/output.*",
-    "test": "semistandard && cc && nyc --reporter=lcov --branches=99 mocha --slow=5000 --timeout=60000 ./test/unit/*.js && prebuild-ci",
+    "test": "npm run test-lint && npm run test-unit && npm run test-licensing",
-    "coverage": "./test/coverage/report.sh",
+    "test-lint": "semistandard && cpplint",
+    "test-unit": "nyc --reporter=lcov --reporter=text --check-coverage --branches=100 mocha",
+    "test-licensing": "license-checker --production --summary --onlyAllow=\"Apache-2.0;BSD;ISC;MIT\"",
     "test-leak": "./test/leak/leak.sh",
-    "docs": "for m in constructor input resize composite operation colour channel output utility; do documentation build --shallow --format=md --markdown-toc=false lib/$m.js >docs/api-$m.md; done"
+    "docs-build": "documentation lint lib && node docs/build && node docs/search-index/build",
+    "docs-serve": "cd docs && npx serve",
+    "docs-publish": "cd docs && npx firebase-tools deploy --project pixelplumbing --only hosting:pixelplumbing-sharp"
   },
   "main": "lib/index.js",
+  "files": [
+    "binding.gyp",
+    "install/**",
+    "lib/**",
+    "src/**"
+  ],
   "repository": {
     "type": "git",
     "url": "git://github.com/lovell/sharp"
@@ -71,9 +114,11 @@
     "jpeg",
     "png",
     "webp",
+    "avif",
     "tiff",
     "gif",
     "svg",
+    "jp2",
     "dzi",
     "image",
     "resize",
@@ -84,37 +129,59 @@
     "vips"
   ],
   "dependencies": {
-    "color": "^3.0.0",
+    "color": "^4.2.3",
-    "detect-libc": "^1.0.3",
+    "detect-libc": "^2.0.1",
-    "nan": "^2.10.0",
+    "node-addon-api": "^5.0.0",
-    "fs-copy-file-sync": "^1.1.1",
+    "prebuild-install": "^7.1.1",
-    "npmlog": "^4.1.2",
+    "semver": "^7.3.8",
-    "prebuild-install": "^4.0.0",
+    "simple-get": "^4.0.1",
-    "semver": "^5.5.1",
+    "tar-fs": "^2.1.1",
-    "simple-get": "^2.8.1",
-    "tar": "^4.4.6",
     "tunnel-agent": "^0.6.0"
   },
   "devDependencies": {
-    "async": "^2.6.1",
+    "async": "^3.2.4",
-    "cc": "^1.0.2",
+    "cc": "^3.0.1",
-    "decompress-zip": "^0.3.1",
+    "documentation": "^14.0.1",
-    "documentation": "^8.1.1",
+    "exif-reader": "^1.0.3",
-    "exif-reader": "^1.0.2",
+    "extract-zip": "^2.0.1",
-    "icc": "^1.0.0",
+    "icc": "^2.0.0",
-    "mocha": "^5.2.0",
+    "license-checker": "^25.0.1",
-    "nyc": "^12.0.2",
+    "mocha": "^10.2.0",
-    "prebuild": "^7.6.2",
+    "mock-fs": "^5.2.0",
-    "prebuild-ci": "^2.2.3",
+    "nyc": "^15.1.0",
-    "rimraf": "^2.6.2",
+    "prebuild": "^11.0.4",
-    "semistandard": "^12.0.1"
+    "rimraf": "^3.0.2",
+    "semistandard": "^16.0.1"
   },
   "license": "Apache-2.0",
   "config": {
-    "libvips": "8.6.1"
+    "libvips": "8.13.3",
+    "integrity": {
+      "darwin-arm64v8": "sha512-xFgYt7CtQSZcWoyUdzPTDNHbioZIrZSEU+gkMxzH4Cgjhi4/N49UsonnIZhKQoTBGloAqEexHeMx4rYTQ2Kgvw==",
+      "darwin-x64": "sha512-6SivWKzu15aUMMohe0wg7sNYMPETVnOe40BuWsnKOgzl3o5FpQqNSgs+68Mi8Za3Qti9/DaR+H/fyD0x48Af2w==",
+      "linux-arm64v8": "sha512-b+iI9V/ehgDabXYRQcvqa5CEysh+1FQsgFmYc358StCrJCDahwNmsQdsiH1GOVd5WaWh5wHUGByPwMmFOO16Aw==",
+      "linux-armv6": "sha512-zRP2F+EiustLE4bXSH8AHCxwfemh9d+QuvmPjira/HL6uJOUuA7SyQgVV1TPwTQle2ioCNnKPm7FEB/MAiT+ug==",
+      "linux-armv7": "sha512-6OCChowE5lBXXXAZrnGdA9dVktg7UdODEBpE5qTroiAJYZv4yXRMgyDFYajok7du2NTgoklhxGk8d9+4vGv5hg==",
+      "linux-x64": "sha512-OTmlmP2r8ozGKdB96X+K5oQE1ojVZanqLqqKlwDpEnfixyIaDGYbVzcjWBNGU3ai/26bvkaCkjynnc2ecYcsuA==",
+      "linuxmusl-arm64v8": "sha512-Qh5Wi+bkKTohFYHzSPssfjMhIkD6z6EHbVmnwmWSsgY9zsUBStFp6+mKcNTQfP5YM5Mz06vJOkLHX2OzEr5TzA==",
+      "linuxmusl-x64": "sha512-DwB4Fs3+ISw9etaLCANkueZDdk758iOS+wNp4TKZkHdq0al6B/3Pk7OHLR8a9E3H6wYDD328u++dcJzip5tacA==",
+      "win32-arm64v8": "sha512-96r3W+O4BtX602B1MtxU5Ru4lKzRRTZqM4OQEBJ//TNL3fiCZdd9agD+RQBjaeR4KFIyBSt3F7IE425ZWmxz+w==",
+      "win32-ia32": "sha512-qfN1MsfQGek1QQd1UNW7JT+5K5Ne1suFQ2GpgpYm3JLSpIve/tz2vOGEGzvTVssOBADJvAkTDFt+yIi3PgU9pA==",
+      "win32-x64": "sha512-eb3aAmjbVVBVRbiYgebQwoxkAt69WI8nwmKlilSQ3kWqoc0pXfIe322rF2UR8ebbISCGvYRUfzD2r1k92RXISQ=="
+    },
+    "runtime": "napi",
+    "target": 7
   },
   "engines": {
-    "node": ">=4.5.0"
+    "node": ">=14.15.0"
+  },
+  "funding": {
+    "url": "https://opencollective.com/libvips"
+  },
+  "binary": {
+    "napi_versions": [
+      7
+    ]
   },
   "semistandard": {
     "env": [
@@ -124,10 +191,7 @@
   "cc": {
     "linelength": "120",
     "filter": [
-      "build/c++11",
+      "build/include"
-      "build/include",
-      "runtime/indentation_namespace",
-      "runtime/references"
     ]
   }
 }

src/common.cc

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -17,11 +17,10 @@
 #include <string.h>
 #include <vector>
 #include <queue>
-#include <mutex>
+#include <map>
+#include <mutex>  // NOLINT(build/c++11)
 
-#include <node.h>
+#include <napi.h>
-#include <node_buffer.h>
-#include <nan.h>
 #include <vips/vips8>
 
 #include "common.h"
@@ -30,53 +29,151 @@ using vips::VImage;
 
 namespace sharp {
 
-  // Convenience methods to access the attributes of a v8::Object
+  // Convenience methods to access the attributes of a Napi::Object
-  bool HasAttr(v8::Handle<v8::Object> obj, std::string attr) {
+  bool HasAttr(Napi::Object obj, std::string attr) {
-    return Nan::Has(obj, Nan::New(attr).ToLocalChecked()).FromJust();
+    return obj.Has(attr);
   }
-  std::string AttrAsStr(v8::Handle<v8::Object> obj, std::string attr) {
+  std::string AttrAsStr(Napi::Object obj, std::string attr) {
-    return *Nan::Utf8String(Nan::Get(obj, Nan::New(attr).ToLocalChecked()).ToLocalChecked());
+    return obj.Get(attr).As<Napi::String>();
+  }
+  std::string AttrAsStr(Napi::Object obj, unsigned int const attr) {
+    return obj.Get(attr).As<Napi::String>();
+  }
+  uint32_t AttrAsUint32(Napi::Object obj, std::string attr) {
+    return obj.Get(attr).As<Napi::Number>().Uint32Value();
+  }
+  int32_t AttrAsInt32(Napi::Object obj, std::string attr) {
+    return obj.Get(attr).As<Napi::Number>().Int32Value();
+  }
+  int32_t AttrAsInt32(Napi::Object obj, unsigned int const attr) {
+    return obj.Get(attr).As<Napi::Number>().Int32Value();
+  }
+  int64_t AttrAsInt64(Napi::Object obj, std::string attr) {
+    return obj.Get(attr).As<Napi::Number>().Int64Value();
+  }
+  double AttrAsDouble(Napi::Object obj, std::string attr) {
+    return obj.Get(attr).As<Napi::Number>().DoubleValue();
+  }
+  double AttrAsDouble(Napi::Object obj, unsigned int const attr) {
+    return obj.Get(attr).As<Napi::Number>().DoubleValue();
+  }
+  bool AttrAsBool(Napi::Object obj, std::string attr) {
+    return obj.Get(attr).As<Napi::Boolean>().Value();
+  }
+  std::vector<double> AttrAsVectorOfDouble(Napi::Object obj, std::string attr) {
+    Napi::Array napiArray = obj.Get(attr).As<Napi::Array>();
+    std::vector<double> vectorOfDouble(napiArray.Length());
+    for (unsigned int i = 0; i < napiArray.Length(); i++) {
+      vectorOfDouble[i] = AttrAsDouble(napiArray, i);
+    }
+    return vectorOfDouble;
+  }
+  std::vector<int32_t> AttrAsInt32Vector(Napi::Object obj, std::string attr) {
+    Napi::Array array = obj.Get(attr).As<Napi::Array>();
+    std::vector<int32_t> vector(array.Length());
+    for (unsigned int i = 0; i < array.Length(); i++) {
+      vector[i] = AttrAsInt32(array, i);
+    }
+    return vector;
+  }
+  Napi::Buffer<char> NewOrCopyBuffer(Napi::Env env, char* data, size_t len) {
+    try {
+      return Napi::Buffer<char>::New(env, data, len, FreeCallback);
+    } catch (Napi::Error const &err) {}
+    Napi::Buffer<char> buf = Napi::Buffer<char>::Copy(env, data, len);
+    FreeCallback(nullptr, data);
+    return buf;
   }
 
-  // Create an InputDescriptor instance from a v8::Object describing an input image
+  // Create an InputDescriptor instance from a Napi::Object describing an input image
-  InputDescriptor* CreateInputDescriptor(
+  InputDescriptor* CreateInputDescriptor(Napi::Object input) {
-    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> &buffersToPersist
-  ) {
-    Nan::HandleScope();
     InputDescriptor *descriptor = new InputDescriptor;
     if (HasAttr(input, "file")) {
       descriptor->file = AttrAsStr(input, "file");
     } else if (HasAttr(input, "buffer")) {
-      v8::Local<v8::Object> buffer = AttrAs<v8::Object>(input, "buffer");
+      Napi::Buffer<char> buffer = input.Get("buffer").As<Napi::Buffer<char>>();
-      descriptor->bufferLength = node::Buffer::Length(buffer);
+      descriptor->bufferLength = buffer.Length();
-      descriptor->buffer = node::Buffer::Data(buffer);
+      descriptor->buffer = buffer.Data();
-      buffersToPersist.push_back(buffer);
+      descriptor->isBuffer = TRUE;
     }
-    descriptor->failOnError = AttrTo<bool>(input, "failOnError");
+    descriptor->failOn = AttrAsEnum<VipsFailOn>(input, "failOn", VIPS_TYPE_FAIL_ON);
     // Density for vector-based input
     if (HasAttr(input, "density")) {
-      descriptor->density = AttrTo<uint32_t>(input, "density");
+      descriptor->density = AttrAsDouble(input, "density");
     }
     // Raw pixel input
     if (HasAttr(input, "rawChannels")) {
-      descriptor->rawChannels = AttrTo<uint32_t>(input, "rawChannels");
+      descriptor->rawDepth = AttrAsEnum<VipsBandFormat>(input, "rawDepth", VIPS_TYPE_BAND_FORMAT);
-      descriptor->rawWidth = AttrTo<uint32_t>(input, "rawWidth");
+      descriptor->rawChannels = AttrAsUint32(input, "rawChannels");
-      descriptor->rawHeight = AttrTo<uint32_t>(input, "rawHeight");
+      descriptor->rawWidth = AttrAsUint32(input, "rawWidth");
+      descriptor->rawHeight = AttrAsUint32(input, "rawHeight");
+      descriptor->rawPremultiplied = AttrAsBool(input, "rawPremultiplied");
+    }
+    // Multi-page input (GIF, TIFF, PDF)
+    if (HasAttr(input, "pages")) {
+      descriptor->pages = AttrAsInt32(input, "pages");
     }
-    // Page input for multi-page TIFF
     if (HasAttr(input, "page")) {
-      descriptor->page = AttrTo<uint32_t>(input, "page");
+      descriptor->page = AttrAsUint32(input, "page");
+    }
+    // Multi-level input (OpenSlide)
+    if (HasAttr(input, "level")) {
+      descriptor->level = AttrAsUint32(input, "level");
+    }
+    // subIFD (OME-TIFF)
+    if (HasAttr(input, "subifd")) {
+      descriptor->subifd = AttrAsInt32(input, "subifd");
     }
     // Create new image
     if (HasAttr(input, "createChannels")) {
-      descriptor->createChannels = AttrTo<uint32_t>(input, "createChannels");
+      descriptor->createChannels = AttrAsUint32(input, "createChannels");
-      descriptor->createWidth = AttrTo<uint32_t>(input, "createWidth");
+      descriptor->createWidth = AttrAsUint32(input, "createWidth");
-      descriptor->createHeight = AttrTo<uint32_t>(input, "createHeight");
+      descriptor->createHeight = AttrAsUint32(input, "createHeight");
-      v8::Local<v8::Object> createBackground = AttrAs<v8::Object>(input, "createBackground");
+      if (HasAttr(input, "createNoiseType")) {
-      for (unsigned int i = 0; i < 4; i++) {
+        descriptor->createNoiseType = AttrAsStr(input, "createNoiseType");
-        descriptor->createBackground[i] = AttrTo<double>(createBackground, i);
+        descriptor->createNoiseMean = AttrAsDouble(input, "createNoiseMean");
+        descriptor->createNoiseSigma = AttrAsDouble(input, "createNoiseSigma");
+      } else {
+        descriptor->createBackground = AttrAsVectorOfDouble(input, "createBackground");
       }
     }
+    // Create new image with text
+    if (HasAttr(input, "textValue")) {
+      descriptor->textValue = AttrAsStr(input, "textValue");
+      if (HasAttr(input, "textFont")) {
+        descriptor->textFont = AttrAsStr(input, "textFont");
+      }
+      if (HasAttr(input, "textFontfile")) {
+        descriptor->textFontfile = AttrAsStr(input, "textFontfile");
+      }
+      if (HasAttr(input, "textWidth")) {
+        descriptor->textWidth = AttrAsUint32(input, "textWidth");
+      }
+      if (HasAttr(input, "textHeight")) {
+        descriptor->textHeight = AttrAsUint32(input, "textHeight");
+      }
+      if (HasAttr(input, "textAlign")) {
+        descriptor->textAlign = AttrAsEnum<VipsAlign>(input, "textAlign", VIPS_TYPE_ALIGN);
+      }
+      if (HasAttr(input, "textJustify")) {
+        descriptor->textJustify = AttrAsBool(input, "textJustify");
+      }
+      if (HasAttr(input, "textDpi")) {
+        descriptor->textDpi = AttrAsUint32(input, "textDpi");
+      }
+      if (HasAttr(input, "textRgba")) {
+        descriptor->textRgba = AttrAsBool(input, "textRgba");
+      }
+      if (HasAttr(input, "textSpacing")) {
+        descriptor->textSpacing = AttrAsUint32(input, "textSpacing");
+      }
+    }
+    // Limit input images to a given number of pixels, where pixels = width * height
+    descriptor->limitInputPixels = static_cast<uint64_t>(AttrAsInt64(input, "limitInputPixels"));
+    // Allow switch from random to sequential access
+    descriptor->access = AttrAsBool(input, "sequentialRead") ? VIPS_ACCESS_SEQUENTIAL : VIPS_ACCESS_RANDOM;
+    // Remove safety features and allow unlimited input
+    descriptor->unlimited = AttrAsBool(input, "unlimited");
     return descriptor;
   }
 
@@ -99,9 +196,28 @@ namespace sharp {
   bool IsWebp(std::string const &str) {
     return EndsWith(str, ".webp") || EndsWith(str, ".WEBP");
   }
+  bool IsGif(std::string const &str) {
+    return EndsWith(str, ".gif") || EndsWith(str, ".GIF");
+  }
+  bool IsJp2(std::string const &str) {
+    return EndsWith(str, ".jp2") || EndsWith(str, ".jpx") || EndsWith(str, ".j2k") || EndsWith(str, ".j2c")
+      || EndsWith(str, ".JP2") || EndsWith(str, ".JPX") || EndsWith(str, ".J2K") || EndsWith(str, ".J2C");
+  }
   bool IsTiff(std::string const &str) {
     return EndsWith(str, ".tif") || EndsWith(str, ".tiff") || EndsWith(str, ".TIF") || EndsWith(str, ".TIFF");
   }
+  bool IsHeic(std::string const &str) {
+    return EndsWith(str, ".heic") || EndsWith(str, ".HEIC");
+  }
+  bool IsHeif(std::string const &str) {
+    return EndsWith(str, ".heif") || EndsWith(str, ".HEIF") || IsHeic(str) || IsAvif(str);
+  }
+  bool IsAvif(std::string const &str) {
+    return EndsWith(str, ".avif") || EndsWith(str, ".AVIF");
+  }
+  bool IsJxl(std::string const &str) {
+    return EndsWith(str, ".jxl") || EndsWith(str, ".JXL");
+  }
   bool IsDz(std::string const &str) {
     return EndsWith(str, ".dzi") || EndsWith(str, ".DZI");
   }
@@ -123,43 +239,77 @@ namespace sharp {
       case ImageType::WEBP: id = "webp"; break;
       case ImageType::TIFF: id = "tiff"; break;
       case ImageType::GIF: id = "gif"; break;
+      case ImageType::JP2: id = "jp2"; break;
       case ImageType::SVG: id = "svg"; break;
+      case ImageType::HEIF: id = "heif"; break;
       case ImageType::PDF: id = "pdf"; break;
       case ImageType::MAGICK: id = "magick"; break;
       case ImageType::OPENSLIDE: id = "openslide"; break;
       case ImageType::PPM: id = "ppm"; break;
       case ImageType::FITS: id = "fits"; break;
-      case ImageType::VIPS: id = "v"; break;
+      case ImageType::EXR: id = "exr"; break;
+      case ImageType::JXL: id = "jxl"; break;
+      case ImageType::VIPS: id = "vips"; break;
       case ImageType::RAW: id = "raw"; break;
       case ImageType::UNKNOWN: id = "unknown"; break;
+      case ImageType::MISSING: id = "missing"; break;
     }
     return id;
   }
 
+  /**
+   * Regenerate this table with something like:
+   *
+   * $ vips -l foreign | grep -i load | awk '{ print $2, $1; }'
+   *
+   * Plus a bit of editing.
+   */
+  std::map<std::string, ImageType> loaderToType = {
+    { "VipsForeignLoadJpegFile", ImageType::JPEG },
+    { "VipsForeignLoadJpegBuffer", ImageType::JPEG },
+    { "VipsForeignLoadPngFile", ImageType::PNG },
+    { "VipsForeignLoadPngBuffer", ImageType::PNG },
+    { "VipsForeignLoadWebpFile", ImageType::WEBP },
+    { "VipsForeignLoadWebpBuffer", ImageType::WEBP },
+    { "VipsForeignLoadTiffFile", ImageType::TIFF },
+    { "VipsForeignLoadTiffBuffer", ImageType::TIFF },
+    { "VipsForeignLoadGifFile", ImageType::GIF },
+    { "VipsForeignLoadGifBuffer", ImageType::GIF },
+    { "VipsForeignLoadNsgifFile", ImageType::GIF },
+    { "VipsForeignLoadNsgifBuffer", ImageType::GIF },
+    { "VipsForeignLoadJp2kBuffer", ImageType::JP2 },
+    { "VipsForeignLoadJp2kFile", ImageType::JP2 },
+    { "VipsForeignLoadSvgFile", ImageType::SVG },
+    { "VipsForeignLoadSvgBuffer", ImageType::SVG },
+    { "VipsForeignLoadHeifFile", ImageType::HEIF },
+    { "VipsForeignLoadHeifBuffer", ImageType::HEIF },
+    { "VipsForeignLoadPdfFile", ImageType::PDF },
+    { "VipsForeignLoadPdfBuffer", ImageType::PDF },
+    { "VipsForeignLoadMagickFile", ImageType::MAGICK },
+    { "VipsForeignLoadMagickBuffer", ImageType::MAGICK },
+    { "VipsForeignLoadMagick7File", ImageType::MAGICK },
+    { "VipsForeignLoadMagick7Buffer", ImageType::MAGICK },
+    { "VipsForeignLoadOpenslideFile", ImageType::OPENSLIDE },
+    { "VipsForeignLoadPpmFile", ImageType::PPM },
+    { "VipsForeignLoadFitsFile", ImageType::FITS },
+    { "VipsForeignLoadOpenexr", ImageType::EXR },
+    { "VipsForeignLoadJxlFile", ImageType::JXL },
+    { "VipsForeignLoadJxlBuffer", ImageType::JXL },
+    { "VipsForeignLoadVips", ImageType::VIPS },
+    { "VipsForeignLoadVipsFile", ImageType::VIPS },
+    { "VipsForeignLoadRaw", ImageType::RAW }
+  };
+
   /*
     Determine image format of a buffer.
   */
   ImageType DetermineImageType(void *buffer, size_t const length) {
     ImageType imageType = ImageType::UNKNOWN;
     char const *load = vips_foreign_find_load_buffer(buffer, length);
-    if (load != NULL) {
+    if (load != nullptr) {
-      std::string const loader = load;
+      auto it = loaderToType.find(load);
-      if (EndsWith(loader, "JpegBuffer")) {
+      if (it != loaderToType.end()) {
-        imageType = ImageType::JPEG;
+        imageType = it->second;
-      } else if (EndsWith(loader, "PngBuffer")) {
-        imageType = ImageType::PNG;
-      } else if (EndsWith(loader, "WebpBuffer")) {
-        imageType = ImageType::WEBP;
-      } else if (EndsWith(loader, "TiffBuffer")) {
-        imageType = ImageType::TIFF;
-      } else if (EndsWith(loader, "GifBuffer")) {
-        imageType = ImageType::GIF;
-      } else if (EndsWith(loader, "SvgBuffer")) {
-        imageType = ImageType::SVG;
-      } else if (EndsWith(loader, "PdfBuffer")) {
-        imageType = ImageType::PDF;
-      } else if (EndsWith(loader, "MagickBuffer")) {
-        imageType = ImageType::MAGICK;
       }
     }
     return imageType;
@@ -172,52 +322,62 @@ namespace sharp {
     ImageType imageType = ImageType::UNKNOWN;
     char const *load = vips_foreign_find_load(file);
     if (load != nullptr) {
-      std::string const loader = load;
+      auto it = loaderToType.find(load);
-      if (EndsWith(loader, "JpegFile")) {
+      if (it != loaderToType.end()) {
-        imageType = ImageType::JPEG;
+        imageType = it->second;
-      } else if (EndsWith(loader, "Png")) {
+      }
-        imageType = ImageType::PNG;
+    } else {
-      } else if (EndsWith(loader, "WebpFile")) {
+      if (EndsWith(vips::VError().what(), " does not exist\n")) {
-        imageType = ImageType::WEBP;
+        imageType = ImageType::MISSING;
-      } else if (EndsWith(loader, "Openslide")) {
-        imageType = ImageType::OPENSLIDE;
-      } else if (EndsWith(loader, "TiffFile")) {
-        imageType = ImageType::TIFF;
-      } else if (EndsWith(loader, "GifFile")) {
-        imageType = ImageType::GIF;
-      } else if (EndsWith(loader, "SvgFile")) {
-        imageType = ImageType::SVG;
-      } else if (EndsWith(loader, "PdfFile")) {
-        imageType = ImageType::PDF;
-      } else if (EndsWith(loader, "Ppm")) {
-        imageType = ImageType::PPM;
-      } else if (EndsWith(loader, "Fits")) {
-        imageType = ImageType::FITS;
-      } else if (EndsWith(loader, "Vips")) {
-        imageType = ImageType::VIPS;
-      } else if (EndsWith(loader, "Magick") || EndsWith(loader, "MagickFile")) {
-        imageType = ImageType::MAGICK;
       }
     }
     return imageType;
   }
 
+  /*
+    Does this image type support multiple pages?
+  */
+  bool ImageTypeSupportsPage(ImageType imageType) {
+    return
+      imageType == ImageType::WEBP ||
+      imageType == ImageType::MAGICK ||
+      imageType == ImageType::GIF ||
+      imageType == ImageType::JP2 ||
+      imageType == ImageType::TIFF ||
+      imageType == ImageType::HEIF ||
+      imageType == ImageType::PDF;
+  }
+
+  /*
+    Does this image type support removal of safety limits?
+  */
+  bool ImageTypeSupportsUnlimited(ImageType imageType) {
+    return
+      imageType == ImageType::JPEG ||
+      imageType == ImageType::PNG ||
+      imageType == ImageType::SVG ||
+      imageType == ImageType::HEIF;
+  }
+
   /*
     Open an image from the given InputDescriptor (filesystem, compressed buffer, raw pixel data)
   */
-  std::tuple<VImage, ImageType> OpenInput(InputDescriptor *descriptor, VipsAccess accessMethod) {
+  std::tuple<VImage, ImageType> OpenInput(InputDescriptor *descriptor) {
     VImage image;
     ImageType imageType;
-    if (descriptor->buffer != nullptr) {
+    if (descriptor->isBuffer) {
       if (descriptor->rawChannels > 0) {
         // Raw, uncompressed pixel data
         image = VImage::new_from_memory(descriptor->buffer, descriptor->bufferLength,
-          descriptor->rawWidth, descriptor->rawHeight, descriptor->rawChannels, VIPS_FORMAT_UCHAR);
+          descriptor->rawWidth, descriptor->rawHeight, descriptor->rawChannels, descriptor->rawDepth);
         if (descriptor->rawChannels < 3) {
           image.get_image()->Type = VIPS_INTERPRETATION_B_W;
         } else {
           image.get_image()->Type = VIPS_INTERPRETATION_sRGB;
         }
+        if (descriptor->rawPremultiplied) {
+          image = image.unpremultiply();
+        }
         imageType = ImageType::RAW;
       } else {
         // Compressed data
@@ -225,71 +385,148 @@ namespace sharp {
         if (imageType != ImageType::UNKNOWN) {
           try {
             vips::VOption *option = VImage::option()
-              ->set("access", accessMethod)
+              ->set("access", descriptor->access)
-              ->set("fail", descriptor->failOnError);
+              ->set("fail_on", descriptor->failOn);
+            if (descriptor->unlimited && ImageTypeSupportsUnlimited(imageType)) {
+              option->set("unlimited", TRUE);
+            }
             if (imageType == ImageType::SVG || imageType == ImageType::PDF) {
-              option->set("dpi", static_cast<double>(descriptor->density));
+              option->set("dpi", descriptor->density);
             }
             if (imageType == ImageType::MAGICK) {
               option->set("density", std::to_string(descriptor->density).data());
             }
+            if (ImageTypeSupportsPage(imageType)) {
+              option->set("n", descriptor->pages);
+              option->set("page", descriptor->page);
+            }
+            if (imageType == ImageType::OPENSLIDE) {
+              option->set("level", descriptor->level);
+            }
             if (imageType == ImageType::TIFF) {
-             option->set("page", descriptor->page);
+              option->set("subifd", descriptor->subifd);
             }
             image = VImage::new_from_buffer(descriptor->buffer, descriptor->bufferLength, nullptr, option);
             if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
-              SetDensity(image, descriptor->density);
+              image = SetDensity(image, descriptor->density);
             }
-          } catch (...) {
+          } catch (vips::VError const &err) {
-            throw vips::VError("Input buffer has corrupt header");
+            throw vips::VError(std::string("Input buffer has corrupt header: ") + err.what());
           }
         } else {
           throw vips::VError("Input buffer contains unsupported image format");
         }
       }
     } else {
-      if (descriptor->createChannels > 0) {
+      int const channels = descriptor->createChannels;
+      if (channels > 0) {
         // Create new image
-        std::vector<double> background = {
+        if (descriptor->createNoiseType == "gaussian") {
-          descriptor->createBackground[0],
+          std::vector<VImage> bands = {};
-          descriptor->createBackground[1],
+          bands.reserve(channels);
-          descriptor->createBackground[2]
+          for (int _band = 0; _band < channels; _band++) {
-        };
+            bands.push_back(VImage::gaussnoise(descriptor->createWidth, descriptor->createHeight, VImage::option()
-        if (descriptor->createChannels == 4) {
+              ->set("mean", descriptor->createNoiseMean)
-          background.push_back(descriptor->createBackground[3]);
+              ->set("sigma", descriptor->createNoiseSigma)));
+          }
+          image = VImage::bandjoin(bands).copy(VImage::option()->set("interpretation",
+            channels < 3 ? VIPS_INTERPRETATION_B_W: VIPS_INTERPRETATION_sRGB));
+        } else {
+          std::vector<double> background = {
+            descriptor->createBackground[0],
+            descriptor->createBackground[1],
+            descriptor->createBackground[2]
+          };
+          if (channels == 4) {
+            background.push_back(descriptor->createBackground[3]);
+          }
+          image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight)
+            .copy(VImage::option()->set("interpretation",
+              channels < 3 ? VIPS_INTERPRETATION_B_W : VIPS_INTERPRETATION_sRGB))
+            .new_from_image(background);
+        }
+        image = image.cast(VIPS_FORMAT_UCHAR);
+        imageType = ImageType::RAW;
+      } else if (descriptor->textValue.length() > 0) {
+        // Create a new image with text
+        vips::VOption *textOptions = VImage::option()
+          ->set("align", descriptor->textAlign)
+          ->set("justify", descriptor->textJustify)
+          ->set("rgba", descriptor->textRgba)
+          ->set("spacing", descriptor->textSpacing)
+          ->set("autofit_dpi", &descriptor->textAutofitDpi);
+        if (descriptor->textWidth > 0) {
+          textOptions->set("width", descriptor->textWidth);
+        }
+        // Ignore dpi if height is set
+        if (descriptor->textWidth > 0 && descriptor->textHeight > 0) {
+          textOptions->set("height", descriptor->textHeight);
+        } else if (descriptor->textDpi > 0) {
+          textOptions->set("dpi", descriptor->textDpi);
+        }
+        if (descriptor->textFont.length() > 0) {
+          textOptions->set("font", const_cast<char*>(descriptor->textFont.data()));
+        }
+        if (descriptor->textFontfile.length() > 0) {
+          textOptions->set("fontfile", const_cast<char*>(descriptor->textFontfile.data()));
+        }
+        image = VImage::text(const_cast<char *>(descriptor->textValue.data()), textOptions);
+        if (!descriptor->textRgba) {
+          image = image.copy(VImage::option()->set("interpretation", VIPS_INTERPRETATION_B_W));
         }
-        image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight).new_from_image(background);
-        image.get_image()->Type = VIPS_INTERPRETATION_sRGB;
         imageType = ImageType::RAW;
       } else {
         // From filesystem
         imageType = DetermineImageType(descriptor->file.data());
+        if (imageType == ImageType::MISSING) {
+          if (descriptor->file.find("<svg") != std::string::npos) {
+            throw vips::VError("Input file is missing, did you mean "
+              "sharp(Buffer.from('" + descriptor->file.substr(0, 8) + "...')?");
+          }
+          throw vips::VError("Input file is missing: " + descriptor->file);
+        }
         if (imageType != ImageType::UNKNOWN) {
           try {
             vips::VOption *option = VImage::option()
-              ->set("access", accessMethod)
+              ->set("access", descriptor->access)
-              ->set("fail", descriptor->failOnError);
+              ->set("fail_on", descriptor->failOn);
+            if (descriptor->unlimited && ImageTypeSupportsUnlimited(imageType)) {
+              option->set("unlimited", TRUE);
+            }
             if (imageType == ImageType::SVG || imageType == ImageType::PDF) {
-              option->set("dpi", static_cast<double>(descriptor->density));
+              option->set("dpi", descriptor->density);
             }
             if (imageType == ImageType::MAGICK) {
               option->set("density", std::to_string(descriptor->density).data());
             }
+            if (ImageTypeSupportsPage(imageType)) {
+              option->set("n", descriptor->pages);
+              option->set("page", descriptor->page);
+            }
+            if (imageType == ImageType::OPENSLIDE) {
+              option->set("level", descriptor->level);
+            }
             if (imageType == ImageType::TIFF) {
-             option->set("page", descriptor->page);
+              option->set("subifd", descriptor->subifd);
             }
             image = VImage::new_from_file(descriptor->file.data(), option);
             if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
-              SetDensity(image, descriptor->density);
+              image = SetDensity(image, descriptor->density);
             }
-          } catch (...) {
+          } catch (vips::VError const &err) {
-            throw vips::VError("Input file has corrupt header");
+            throw vips::VError(std::string("Input file has corrupt header: ") + err.what());
           }
         } else {
-          throw vips::VError("Input file is missing or of an unsupported image format");
+          throw vips::VError("Input file contains unsupported image format");
         }
       }
     }
+
+    // Limit input images to a given number of pixels, where pixels = width * height
+    if (descriptor->limitInputPixels > 0 &&
+      static_cast<uint64_t>(image.width()) * image.height() > descriptor->limitInputPixels) {
+      throw vips::VError("Input image exceeds pixel limit");
+    }
     return std::make_tuple(image, imageType);
   }
 
@@ -305,12 +542,7 @@ namespace sharp {
     Uses colour space interpretation with number of channels to guess this.
   */
   bool HasAlpha(VImage image) {
-    int const bands = image.bands();
+    return image.has_alpha();
-    VipsInterpretation const interpretation = image.interpretation();
-    return (
-      (bands == 2 && interpretation == VIPS_INTERPRETATION_B_W) ||
-      (bands == 4 && interpretation != VIPS_INTERPRETATION_CMYK) ||
-      (bands == 5 && interpretation == VIPS_INTERPRETATION_CMYK));
   }
 
   /*
@@ -327,15 +559,57 @@ namespace sharp {
   /*
     Set EXIF Orientation of image.
   */
-  void SetExifOrientation(VImage image, int const orientation) {
+  VImage SetExifOrientation(VImage image, int const orientation) {
-    image.set(VIPS_META_ORIENTATION, orientation);
+    VImage copy = image.copy();
+    copy.set(VIPS_META_ORIENTATION, orientation);
+    return copy;
   }
 
   /*
     Remove EXIF Orientation from image.
   */
-  void RemoveExifOrientation(VImage image) {
+  VImage RemoveExifOrientation(VImage image) {
-    vips_image_remove(image.get_image(), VIPS_META_ORIENTATION);
+    VImage copy = image.copy();
+    copy.remove(VIPS_META_ORIENTATION);
+    copy.remove("exif-ifd0-Orientation");
+    return copy;
+  }
+
+  /*
+    Set animation properties if necessary.
+  */
+  VImage SetAnimationProperties(VImage image, int nPages, int pageHeight, std::vector<int> delay, int loop) {
+    bool hasDelay = !delay.empty();
+
+    // Avoid a copy if none of the animation properties are needed.
+    if (nPages == 1 && !hasDelay && loop == -1) return image;
+
+    if (delay.size() == 1) {
+      // We have just one delay, repeat that value for all frames.
+      delay.insert(delay.end(), nPages - 1, delay[0]);
+    }
+
+    // Attaching metadata, need to copy the image.
+    VImage copy = image.copy();
+
+    // Only set page-height if we have more than one page, or this could
+    // accidentally turn into an animated image later.
+    if (nPages > 1) copy.set(VIPS_META_PAGE_HEIGHT, pageHeight);
+    if (hasDelay) copy.set("delay", delay);
+    if (loop != -1) copy.set("loop", loop);
+
+    return copy;
+  }
+
+  /*
+    Remove animation properties from image.
+  */
+  VImage RemoveAnimationProperties(VImage image) {
+    VImage copy = image.copy();
+    copy.remove(VIPS_META_PAGE_HEIGHT);
+    copy.remove("delay");
+    copy.remove("loop");
+    return copy;
   }
 
   /*
@@ -355,40 +629,50 @@ namespace sharp {
   /*
     Set pixels/mm resolution based on a pixels/inch density.
   */
-  void SetDensity(VImage image, const int density) {
+  VImage SetDensity(VImage image, const double density) {
-    const double pixelsPerMm = static_cast<double>(density) / 25.4;
+    const double pixelsPerMm = density / 25.4;
-    image.set("Xres", pixelsPerMm);
+    VImage copy = image.copy();
-    image.set("Yres", pixelsPerMm);
+    copy.get_image()->Xres = pixelsPerMm;
-    image.set(VIPS_META_RESOLUTION_UNIT, "in");
+    copy.get_image()->Yres = pixelsPerMm;
+    return copy;
+  }
+
+  /*
+    Multi-page images can have a page height. Fetch it, and sanity check it.
+    If page-height is not set, it defaults to the image height
+  */
+  int GetPageHeight(VImage image) {
+    return vips_image_get_page_height(image.get_image());
   }
 
   /*
     Check the proposed format supports the current dimensions.
   */
   void AssertImageTypeDimensions(VImage image, ImageType const imageType) {
+    const int height = image.get_typeof(VIPS_META_PAGE_HEIGHT) == G_TYPE_INT
+      ? image.get_int(VIPS_META_PAGE_HEIGHT)
+      : image.height();
     if (imageType == ImageType::JPEG) {
-      if (image.width() > 65535 || image.height() > 65535) {
+      if (image.width() > 65535 || height > 65535) {
         throw vips::VError("Processed image is too large for the JPEG format");
       }
-    } else if (imageType == ImageType::PNG) {
-      if (image.width() > 2147483647 || image.height() > 2147483647) {
-        throw vips::VError("Processed image is too large for the PNG format");
-      }
     } else if (imageType == ImageType::WEBP) {
-      if (image.width() > 16383 || image.height() > 16383) {
+      if (image.width() > 16383 || height > 16383) {
         throw vips::VError("Processed image is too large for the WebP format");
       }
+    } else if (imageType == ImageType::GIF) {
+      if (image.width() > 65535 || height > 65535) {
+        throw vips::VError("Processed image is too large for the GIF format");
+      }
     }
   }
 
   /*
     Called when a Buffer undergoes GC, required to support mixed runtime libraries in Windows
   */
-  void FreeCallback(char* data, void* hint) {
+  std::function<void(void*, char*)> FreeCallback = [](void*, char* data) {
-    if (data != nullptr) {
+    g_free(data);
-      g_free(data);
+  };
-    }
-  }
 
   /*
     Temporary buffer of warnings
@@ -417,6 +701,32 @@ namespace sharp {
     return warning;
   }
 
+  /*
+    Attach an event listener for progress updates, used to detect timeout
+  */
+  void SetTimeout(VImage image, int const seconds) {
+    if (seconds > 0) {
+      VipsImage *im = image.get_image();
+      if (im->progress_signal == NULL) {
+        int *timeout = VIPS_NEW(im, int);
+        *timeout = seconds;
+        g_signal_connect(im, "eval", G_CALLBACK(VipsProgressCallBack), timeout);
+        vips_image_set_progress(im, TRUE);
+      }
+    }
+  }
+
+  /*
+    Event listener for progress updates, used to detect timeout
+  */
+  void VipsProgressCallBack(VipsImage *im, VipsProgress *progress, int *timeout) {
+    if (*timeout > 0 && progress->run >= *timeout) {
+      vips_image_set_kill(im, TRUE);
+      vips_error("timeout", "%d%% complete", progress->percent);
+      *timeout = 0;
+    }
+  }
+
   /*
     Calculate the (left, top) coordinates of the output image
     within the input image, applying the given gravity during an embed.
@@ -536,26 +846,18 @@ namespace sharp {
     int top = 0;
 
     // assign only if valid
-    if (x >= 0 && x < (inWidth - outWidth)) {
+    if (x < (inWidth - outWidth)) {
       left = x;
     } else if (x >= (inWidth - outWidth)) {
       left = inWidth - outWidth;
     }
 
-    if (y >= 0 && y < (inHeight - outHeight)) {
+    if (y < (inHeight - outHeight)) {
       top = y;
     } else if (y >= (inHeight - outHeight)) {
       top = inHeight - outHeight;
     }
 
-    // the resulting left and top could have been outside the image after calculation from bottom/right edges
-    if (left < 0) {
-      left = 0;
-    }
-    if (top < 0) {
-      top = 0;
-    }
-
     return std::make_tuple(left, top);
   }
 
@@ -574,36 +876,154 @@ namespace sharp {
     return Is16Bit(interpretation) ? 65535.0 : 255.0;
   }
 
-  /*
-    Get boolean operation type from string
-  */
-  VipsOperationBoolean GetBooleanOperation(std::string const opStr) {
-    return static_cast<VipsOperationBoolean>(
-      vips_enum_from_nick(nullptr, VIPS_TYPE_OPERATION_BOOLEAN, opStr.data()));
-  }
-
-  /*
-    Get interpretation type from string
-  */
-  VipsInterpretation GetInterpretation(std::string const typeStr) {
-    return static_cast<VipsInterpretation>(
-      vips_enum_from_nick(nullptr, VIPS_TYPE_INTERPRETATION, typeStr.data()));
-  }
-
   /*
     Convert RGBA value to another colourspace
   */
-  std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba, VipsInterpretation const interpretation) {
+  std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba,
+    VipsInterpretation const interpretation, bool premultiply) {
     int const bands = static_cast<int>(rgba.size());
-    if (bands < 3 || interpretation == VIPS_INTERPRETATION_sRGB || interpretation == VIPS_INTERPRETATION_RGB) {
+    if (bands < 3) {
       return rgba;
-    } else {
-      VImage pixel = VImage::new_matrix(1, 1);
-      pixel.set("bands", bands);
-      pixel = pixel.new_from_image(rgba);
-      pixel = pixel.colourspace(interpretation, VImage::option()->set("source_space", VIPS_INTERPRETATION_sRGB));
-      return pixel(0, 0);
     }
+    VImage pixel = VImage::new_matrix(1, 1);
+    pixel.set("bands", bands);
+    pixel = pixel
+      .new_from_image(rgba)
+      .colourspace(interpretation, VImage::option()->set("source_space", VIPS_INTERPRETATION_sRGB));
+    if (premultiply) {
+      pixel = pixel.premultiply();
+    }
+    return pixel(0, 0);
+  }
+
+  /*
+    Apply the alpha channel to a given colour
+  */
+  std::tuple<VImage, std::vector<double>> ApplyAlpha(VImage image, std::vector<double> colour, bool premultiply) {
+    // Scale up 8-bit values to match 16-bit input image
+    double const multiplier = sharp::Is16Bit(image.interpretation()) ? 256.0 : 1.0;
+    // Create alphaColour colour
+    std::vector<double> alphaColour;
+    if (image.bands() > 2) {
+      alphaColour = {
+        multiplier * colour[0],
+        multiplier * colour[1],
+        multiplier * colour[2]
+      };
+    } else {
+      // Convert sRGB to greyscale
+      alphaColour = { multiplier * (
+        0.2126 * colour[0] +
+        0.7152 * colour[1] +
+        0.0722 * colour[2])
+      };
+    }
+    // Add alpha channel to alphaColour colour
+    if (colour[3] < 255.0 || HasAlpha(image)) {
+      alphaColour.push_back(colour[3] * multiplier);
+    }
+    // Ensure alphaColour colour uses correct colourspace
+    alphaColour = sharp::GetRgbaAsColourspace(alphaColour, image.interpretation(), premultiply);
+    // Add non-transparent alpha channel, if required
+    if (colour[3] < 255.0 && !HasAlpha(image)) {
+      image = image.bandjoin(
+        VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier).cast(image.format()));
+    }
+    return std::make_tuple(image, alphaColour);
+  }
+
+  /*
+    Removes alpha channel, if any.
+  */
+  VImage RemoveAlpha(VImage image) {
+    if (HasAlpha(image)) {
+      image = image.extract_band(0, VImage::option()->set("n", image.bands() - 1));
+    }
+    return image;
+  }
+
+  /*
+    Ensures alpha channel, if missing.
+  */
+  VImage EnsureAlpha(VImage image, double const value) {
+    if (!HasAlpha(image)) {
+      std::vector<double> alpha;
+      alpha.push_back(value * sharp::MaximumImageAlpha(image.interpretation()));
+      image = image.bandjoin_const(alpha);
+    }
+    return image;
+  }
+
+  std::pair<double, double> ResolveShrink(int width, int height, int targetWidth, int targetHeight,
+    Canvas canvas, bool swap, bool withoutEnlargement, bool withoutReduction) {
+    if (swap && canvas != Canvas::IGNORE_ASPECT) {
+      // Swap input width and height when requested.
+      std::swap(width, height);
+    }
+
+    double hshrink = 1.0;
+    double vshrink = 1.0;
+
+    if (targetWidth > 0 && targetHeight > 0) {
+      // Fixed width and height
+      hshrink = static_cast<double>(width) / targetWidth;
+      vshrink = static_cast<double>(height) / targetHeight;
+
+      switch (canvas) {
+        case Canvas::CROP:
+        case Canvas::MIN:
+          if (hshrink < vshrink) {
+            vshrink = hshrink;
+          } else {
+            hshrink = vshrink;
+          }
+          break;
+        case Canvas::EMBED:
+        case Canvas::MAX:
+          if (hshrink > vshrink) {
+            vshrink = hshrink;
+          } else {
+            hshrink = vshrink;
+          }
+          break;
+        case Canvas::IGNORE_ASPECT:
+          break;
+      }
+    } else if (targetWidth > 0) {
+      // Fixed width
+      hshrink = static_cast<double>(width) / targetWidth;
+
+      if (canvas != Canvas::IGNORE_ASPECT) {
+        // Auto height
+        vshrink = hshrink;
+      }
+    } else if (targetHeight > 0) {
+      // Fixed height
+      vshrink = static_cast<double>(height) / targetHeight;
+
+      if (canvas != Canvas::IGNORE_ASPECT) {
+        // Auto width
+        hshrink = vshrink;
+      }
+    }
+
+    // We should not reduce or enlarge the output image, if
+    // withoutReduction or withoutEnlargement is specified.
+    if (withoutReduction) {
+      // Equivalent of VIPS_SIZE_UP
+      hshrink = std::min(1.0, hshrink);
+      vshrink = std::min(1.0, vshrink);
+    } else if (withoutEnlargement) {
+      // Equivalent of VIPS_SIZE_DOWN
+      hshrink = std::max(1.0, hshrink);
+      vshrink = std::max(1.0, vshrink);
+    }
+
+    // We don't want to shrink so much that we send an axis to 0
+    hshrink = std::min(hshrink, static_cast<double>(width));
+    vshrink = std::min(vshrink, static_cast<double>(height));
+
+    return std::make_pair(hshrink, vshrink);
   }
 
 }  // namespace sharp

src/common.h

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -19,23 +19,24 @@
 #include <tuple>
 #include <vector>
 
-#include <node.h>
+#include <napi.h>
-#include <nan.h>
 #include <vips/vips8>
 
 // Verify platform and compiler compatibility
 
-#if (VIPS_MAJOR_VERSION < 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 6))
+#if (VIPS_MAJOR_VERSION < 8) || \
-#error libvips version 8.6.1+ is required - see sharp.pixelplumbing.com/page/install
+  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 13) || \
+  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION == 13 && VIPS_MICRO_VERSION < 3)
+#error "libvips version 8.13.3+ is required - please see https://sharp.pixelplumbing.com/install"
 #endif
 
 #if ((!defined(__clang__)) && defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)))
-#error GCC version 4.6+ is required for C++11 features - see sharp.pixelplumbing.com/page/install#prerequisites
+#error "GCC version 4.6+ is required for C++11 features - please see https://sharp.pixelplumbing.com/install"
 #endif
 
 #if (defined(__clang__) && defined(__has_feature))
 #if (!__has_feature(cxx_range_for))
-#error clang version 3.0+ is required for C++11 features - see sharp.pixelplumbing.com/page/install#prerequisites
+#error "clang version 3.0+ is required for C++11 features - please see https://sharp.pixelplumbing.com/install"
 #endif
 #endif
 
@@ -43,73 +44,128 @@ using vips::VImage;
 
 namespace sharp {
 
-  struct InputDescriptor {
+  struct InputDescriptor {  // NOLINT(runtime/indentation_namespace)
     std::string name;
     std::string file;
     char *buffer;
-    bool failOnError;
+    VipsFailOn failOn;
+    uint64_t limitInputPixels;
+    bool unlimited;
+    VipsAccess access;
     size_t bufferLength;
-    int density;
+    bool isBuffer;
+    double density;
+    VipsBandFormat rawDepth;
     int rawChannels;
     int rawWidth;
     int rawHeight;
+    bool rawPremultiplied;
+    int pages;
     int page;
+    int level;
+    int subifd;
     int createChannels;
     int createWidth;
     int createHeight;
-    double createBackground[4];
+    std::vector<double> createBackground;
+    std::string createNoiseType;
+    double createNoiseMean;
+    double createNoiseSigma;
+    std::string textValue;
+    std::string textFont;
+    std::string textFontfile;
+    int textWidth;
+    int textHeight;
+    VipsAlign textAlign;
+    bool textJustify;
+    int textDpi;
+    bool textRgba;
+    int textSpacing;
+    int textAutofitDpi;
 
     InputDescriptor():
       buffer(nullptr),
-      failOnError(FALSE),
+      failOn(VIPS_FAIL_ON_WARNING),
+      limitInputPixels(0x3FFF * 0x3FFF),
+      unlimited(FALSE),
+      access(VIPS_ACCESS_RANDOM),
       bufferLength(0),
-      density(72),
+      isBuffer(FALSE),
+      density(72.0),
+      rawDepth(VIPS_FORMAT_UCHAR),
       rawChannels(0),
       rawWidth(0),
       rawHeight(0),
+      rawPremultiplied(false),
+      pages(1),
       page(0),
+      level(0),
+      subifd(-1),
       createChannels(0),
       createWidth(0),
-      createHeight(0) {
+      createHeight(0),
-        createBackground[0] = 0.0;
+      createBackground{ 0.0, 0.0, 0.0, 255.0 },
-        createBackground[1] = 0.0;
+      createNoiseMean(0.0),
-        createBackground[2] = 0.0;
+      createNoiseSigma(0.0),
-        createBackground[3] = 255.0;
+      textWidth(0),
-      }
+      textHeight(0),
+      textAlign(VIPS_ALIGN_LOW),
+      textJustify(FALSE),
+      textDpi(72),
+      textRgba(FALSE),
+      textSpacing(0),
+      textAutofitDpi(0) {}
   };
 
-  // Convenience methods to access the attributes of a v8::Object
+  // Convenience methods to access the attributes of a Napi::Object
-  bool HasAttr(v8::Handle<v8::Object> obj, std::string attr);
+  bool HasAttr(Napi::Object obj, std::string attr);
-  std::string AttrAsStr(v8::Handle<v8::Object> obj, std::string attr);
+  std::string AttrAsStr(Napi::Object obj, std::string attr);
-  template<typename T> v8::Local<T> AttrAs(v8::Handle<v8::Object> obj, std::string attr) {
+  std::string AttrAsStr(Napi::Object obj, unsigned int const attr);
-    return Nan::Get(obj, Nan::New(attr).ToLocalChecked()).ToLocalChecked().As<T>();
+  uint32_t AttrAsUint32(Napi::Object obj, std::string attr);
-  }
+  int32_t AttrAsInt32(Napi::Object obj, std::string attr);
-  template<typename T> T AttrTo(v8::Handle<v8::Object> obj, std::string attr) {
+  int32_t AttrAsInt32(Napi::Object obj, unsigned int const attr);
-    return Nan::To<T>(Nan::Get(obj, Nan::New(attr).ToLocalChecked()).ToLocalChecked()).FromJust();
+  double AttrAsDouble(Napi::Object obj, std::string attr);
-  }
+  double AttrAsDouble(Napi::Object obj, unsigned int const attr);
-  template<typename T> T AttrTo(v8::Handle<v8::Object> obj, int attr) {
+  bool AttrAsBool(Napi::Object obj, std::string attr);
-    return Nan::To<T>(Nan::Get(obj, attr).ToLocalChecked()).FromJust();
+  std::vector<double> AttrAsVectorOfDouble(Napi::Object obj, std::string attr);
+  std::vector<int32_t> AttrAsInt32Vector(Napi::Object obj, std::string attr);
+  template <class T> T AttrAsEnum(Napi::Object obj, std::string attr, GType type) {
+    return static_cast<T>(
+      vips_enum_from_nick(nullptr, type, AttrAsStr(obj, attr).data()));
   }
+  Napi::Buffer<char> NewOrCopyBuffer(Napi::Env env, char* data, size_t len);
 
-  // Create an InputDescriptor instance from a v8::Object describing an input image
+  // Create an InputDescriptor instance from a Napi::Object describing an input image
-  InputDescriptor* CreateInputDescriptor(
+  InputDescriptor* CreateInputDescriptor(Napi::Object input);
-    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> &buffersToPersist);
 
   enum class ImageType {
     JPEG,
     PNG,
     WEBP,
+    JP2,
     TIFF,
     GIF,
     SVG,
+    HEIF,
     PDF,
     MAGICK,
     OPENSLIDE,
     PPM,
     FITS,
+    EXR,
+    JXL,
     VIPS,
     RAW,
-    UNKNOWN
+    UNKNOWN,
+    MISSING
+  };
+
+  enum class Canvas {
+      CROP,
+      EMBED,
+      MAX,
+      MIN,
+      IGNORE_ASPECT
   };
 
   // How many tasks are in the queue?
@@ -122,7 +178,13 @@ namespace sharp {
   bool IsJpeg(std::string const &str);
   bool IsPng(std::string const &str);
   bool IsWebp(std::string const &str);
+  bool IsJp2(std::string const &str);
+  bool IsGif(std::string const &str);
   bool IsTiff(std::string const &str);
+  bool IsHeic(std::string const &str);
+  bool IsHeif(std::string const &str);
+  bool IsAvif(std::string const &str);
+  bool IsJxl(std::string const &str);
   bool IsDz(std::string const &str);
   bool IsDzZip(std::string const &str);
   bool IsV(std::string const &str);
@@ -142,10 +204,20 @@ namespace sharp {
   */
   ImageType DetermineImageType(char const *file);
 
+  /*
+    Does this image type support multiple pages?
+  */
+  bool ImageTypeSupportsPage(ImageType imageType);
+
+  /*
+    Does this image type support removal of safety limits?
+  */
+  bool ImageTypeSupportsUnlimited(ImageType imageType);
+
   /*
     Open an image from the given InputDescriptor (filesystem, compressed buffer, raw pixel data)
   */
-  std::tuple<VImage, ImageType> OpenInput(InputDescriptor *descriptor, VipsAccess accessMethod);
+  std::tuple<VImage, ImageType> OpenInput(InputDescriptor *descriptor);
 
   /*
     Does this image have an embedded profile?
@@ -166,12 +238,22 @@ namespace sharp {
   /*
     Set EXIF Orientation of image.
   */
-  void SetExifOrientation(VImage image, int const orientation);
+  VImage SetExifOrientation(VImage image, int const orientation);
 
   /*
     Remove EXIF Orientation from image.
   */
-  void RemoveExifOrientation(VImage image);
+  VImage RemoveExifOrientation(VImage image);
+
+  /*
+    Set animation properties if necessary.
+  */
+  VImage SetAnimationProperties(VImage image, int nPages, int pageHeight, std::vector<int> delay, int loop);
+
+  /*
+    Remove animation properties from image.
+  */
+  VImage RemoveAnimationProperties(VImage image);
 
   /*
     Does this image have a non-default density?
@@ -186,7 +268,13 @@ namespace sharp {
   /*
     Set pixels/mm resolution based on a pixels/inch density.
   */
-  void SetDensity(VImage image, const int density);
+  VImage SetDensity(VImage image, const double density);
+
+  /*
+    Multi-page images can have a page height. Fetch it, and sanity check it.
+    If page-height is not set, it defaults to the image height
+  */
+  int GetPageHeight(VImage image);
 
   /*
     Check the proposed format supports the current dimensions.
@@ -196,7 +284,7 @@ namespace sharp {
   /*
     Called when a Buffer undergoes GC, required to support mixed runtime libraries in Windows
   */
-  void FreeCallback(char* data, void* hint);
+  extern std::function<void(void*, char*)> FreeCallback;
 
   /*
     Called with warnings from the glib-registered "VIPS" domain
@@ -208,6 +296,16 @@ namespace sharp {
   */
   std::string VipsWarningPop();
 
+  /*
+    Attach an event listener for progress updates, used to detect timeout
+  */
+  void SetTimeout(VImage image, int const timeoutSeconds);
+
+  /*
+    Event listener for progress updates, used to detect timeout
+  */
+  void VipsProgressCallBack(VipsImage *image, VipsProgress *progress, int *timeoutSeconds);
+
   /*
     Calculate the (left, top) coordinates of the output image
     within the input image, applying the given gravity during an embed.
@@ -240,20 +338,35 @@ namespace sharp {
   */
   double MaximumImageAlpha(VipsInterpretation const interpretation);
 
-  /*
-    Get boolean operation type from string
-  */
-  VipsOperationBoolean GetBooleanOperation(std::string const opStr);
-
-  /*
-    Get interpretation type from string
-  */
-  VipsInterpretation GetInterpretation(std::string const typeStr);
-
   /*
     Convert RGBA value to another colourspace
   */
-  std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba, VipsInterpretation const interpretation);
+  std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba,
+    VipsInterpretation const interpretation, bool premultiply);
+
+  /*
+    Apply the alpha channel to a given colour
+   */
+  std::tuple<VImage, std::vector<double>> ApplyAlpha(VImage image, std::vector<double> colour, bool premultiply);
+
+  /*
+    Removes alpha channel, if any.
+  */
+  VImage RemoveAlpha(VImage image);
+
+  /*
+    Ensures alpha channel, if missing.
+  */
+  VImage EnsureAlpha(VImage image, double const value);
+
+  /*
+    Calculate the shrink factor, taking into account auto-rotate, the canvas
+    mode, and so on. The hshrink/vshrink are the amount to shrink the input
+    image axes by in order for the output axes (ie. after rotation) to match
+    the required thumbnail width/height and canvas mode.
+  */
+  std::pair<double, double> ResolveShrink(int width, int height, int targetWidth, int targetHeight,
+    Canvas canvas, bool swap, bool withoutEnlargement, bool withoutReduction);
 
 }  // namespace sharp
 

src/libvips/cplusplus/VConnection.cpp

@@ -0,0 +1,151 @@
+/* Object part of the VSource and VTarget class
+ */
+
+/*
+
+    Copyright (C) 1991-2001 The National Gallery
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301  USA
+
+ */
+
+/*
+
+    These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
+
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /*HAVE_CONFIG_H*/
+
+#include <vips/vips8>
+
+#include <vips/debug.h>
+
+/*
+#define VIPS_DEBUG
+#define VIPS_DEBUG_VERBOSE
+ */
+
+VIPS_NAMESPACE_START
+
+VSource 
+VSource::new_from_descriptor( int descriptor )
+{
+	VipsSource *input;
+
+	if( !(input = vips_source_new_from_descriptor( descriptor )) )
+		throw VError();
+
+	VSource out( input ); 
+
+	return( out ); 
+}
+
+VSource 
+VSource::new_from_file( const char *filename )
+{
+	VipsSource *input;
+
+	if( !(input = vips_source_new_from_file( filename )) )
+		throw VError();
+
+	VSource out( input ); 
+
+	return( out ); 
+}
+
+VSource 
+VSource::new_from_blob( VipsBlob *blob )
+{
+	VipsSource *input;
+
+	if( !(input = vips_source_new_from_blob( blob )) )
+		throw VError();
+
+	VSource out( input ); 
+
+	return( out ); 
+}
+
+VSource 
+VSource::new_from_memory( const void *data, 
+	size_t size )
+{
+	VipsSource *input;
+
+	if( !(input = vips_source_new_from_memory( data, size )) )
+		throw VError();
+
+	VSource out( input ); 
+
+	return( out ); 
+}
+
+VSource 
+VSource::new_from_options( const char *options )
+{
+	VipsSource *input;
+
+	if( !(input = vips_source_new_from_options( options )) )
+		throw VError();
+
+	VSource out( input ); 
+
+	return( out ); 
+}
+
+VTarget 
+VTarget::new_to_descriptor( int descriptor )
+{
+	VipsTarget *output;
+
+	if( !(output = vips_target_new_to_descriptor( descriptor )) )
+		throw VError();
+
+	VTarget out( output ); 
+
+	return( out ); 
+}
+
+VTarget 
+VTarget::new_to_file( const char *filename )
+{
+	VipsTarget *output;
+
+	if( !(output = vips_target_new_to_file( filename )) )
+		throw VError();
+
+	VTarget out( output ); 
+
+	return( out ); 
+}
+
+VTarget 
+VTarget::new_to_memory()
+{
+	VipsTarget *output;
+
+	if( !(output = vips_target_new_to_memory()) )
+		throw VError();
+
+	VTarget out( output ); 
+
+	return( out ); 
+}
+
+VIPS_NAMESPACE_END

src/libvips/cplusplus/VError.cpp

@@ -30,9 +30,6 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif /*HAVE_CONFIG_H*/
-#include <vips/intl.h>
-
-#include <iostream>
 
 #include <vips/vips8>
 

src/libvips/cplusplus/VInterpolate.cpp

@@ -31,7 +31,6 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif /*HAVE_CONFIG_H*/
-#include <vips/intl.h>
 
 #include <vips/vips8>
 
@@ -60,17 +59,4 @@ VInterpolate::new_from_name( const char *name, VOption *options )
 	return( out ); 
 }
 
-VOption *
-VOption::set( const char *name, VInterpolate value )
-{
-	Pair *pair = new Pair( name );
-
-	pair->input = true;
-	g_value_init( &pair->value, VIPS_TYPE_INTERPOLATE );
-	g_value_set_object( &pair->value, value.get_interpolate() );
-	options.push_back( pair );
-
-	return( this );
-}
-
 VIPS_NAMESPACE_END

src/libvips/cplusplus/VRegion.cpp

@@ -0,0 +1,27 @@
+// Object part of VRegion class
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /*HAVE_CONFIG_H*/
+
+#include <vips/vips8>
+
+#include <vips/debug.h>
+
+VIPS_NAMESPACE_START
+
+VRegion
+VRegion::new_from_image( VImage image )
+{
+	VipsRegion *region;
+
+	if( !(region = vips_region_new( image.get_image() )) ) {
+		throw VError();
+	}
+
+	VRegion out( region );
+
+	return( out );
+}
+
+VIPS_NAMESPACE_END

src/metadata.cc

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,28 +15,16 @@
 #include <numeric>
 #include <vector>
 
-#include <node.h>
+#include <napi.h>
-#include <nan.h>
 #include <vips/vips8>
 
 #include "common.h"
 #include "metadata.h"
 
-class MetadataWorker : public Nan::AsyncWorker {
+class MetadataWorker : public Napi::AsyncWorker {
  public:
-  MetadataWorker(
+  MetadataWorker(Napi::Function callback, MetadataBaton *baton, Napi::Function debuglog) :
-    Nan::Callback *callback, MetadataBaton *baton, Nan::Callback *debuglog,
+    Napi::AsyncWorker(callback), baton(baton), debuglog(Napi::Persistent(debuglog)) {}
-    std::vector<v8::Local<v8::Object>> const buffersToPersist) :
-    Nan::AsyncWorker(callback, "sharp:MetadataWorker"),
-    baton(baton), debuglog(debuglog),
-    buffersToPersist(buffersToPersist) {
-    // Protect Buffer objects from GC, keyed on index
-    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
-      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
-        SaveToPersistent(index, buffer);
-        return index + 1;
-      });
-  }
   ~MetadataWorker() {}
 
   void Execute() {
@@ -46,7 +34,7 @@ class MetadataWorker : public Nan::AsyncWorker {
     vips::VImage image;
     sharp::ImageType imageType = sharp::ImageType::UNKNOWN;
     try {
-      std::tie(image, imageType) = OpenInput(baton->input, VIPS_ACCESS_SEQUENTIAL);
+      std::tie(image, imageType) = OpenInput(baton->input);
     } catch (vips::VError const &err) {
       (baton->err).append(err.what());
     }
@@ -62,7 +50,52 @@ class MetadataWorker : public Nan::AsyncWorker {
       if (sharp::HasDensity(image)) {
         baton->density = sharp::GetDensity(image);
       }
+      if (image.get_typeof("jpeg-chroma-subsample") == VIPS_TYPE_REF_STRING) {
+        baton->chromaSubsampling = image.get_string("jpeg-chroma-subsample");
+      }
+      if (image.get_typeof("interlaced") == G_TYPE_INT) {
+        baton->isProgressive = image.get_int("interlaced") == 1;
+      }
+      if (image.get_typeof("palette-bit-depth") == G_TYPE_INT) {
+        baton->paletteBitDepth = image.get_int("palette-bit-depth");
+      }
+      if (image.get_typeof(VIPS_META_N_PAGES) == G_TYPE_INT) {
+        baton->pages = image.get_int(VIPS_META_N_PAGES);
+      }
+      if (image.get_typeof(VIPS_META_PAGE_HEIGHT) == G_TYPE_INT) {
+        baton->pageHeight = image.get_int(VIPS_META_PAGE_HEIGHT);
+      }
+      if (image.get_typeof("loop") == G_TYPE_INT) {
+        baton->loop = image.get_int("loop");
+      }
+      if (image.get_typeof("delay") == VIPS_TYPE_ARRAY_INT) {
+        baton->delay = image.get_array_int("delay");
+      }
+      if (image.get_typeof("heif-primary") == G_TYPE_INT) {
+        baton->pagePrimary = image.get_int("heif-primary");
+      }
+      if (image.get_typeof("heif-compression") == VIPS_TYPE_REF_STRING) {
+        baton->compression = image.get_string("heif-compression");
+      }
+      if (image.get_typeof(VIPS_META_RESOLUTION_UNIT) == VIPS_TYPE_REF_STRING) {
+        baton->resolutionUnit = image.get_string(VIPS_META_RESOLUTION_UNIT);
+      }
+      if (image.get_typeof("openslide.level-count") == VIPS_TYPE_REF_STRING) {
+        int const levels = std::stoi(image.get_string("openslide.level-count"));
+        for (int l = 0; l < levels; l++) {
+          std::string prefix = "openslide.level[" + std::to_string(l) + "].";
+          int const width = std::stoi(image.get_string((prefix + "width").data()));
+          int const height = std::stoi(image.get_string((prefix + "height").data()));
+          baton->levels.push_back(std::pair<int, int>(width, height));
+        }
+      }
+      if (image.get_typeof(VIPS_META_N_SUBIFDS) == G_TYPE_INT) {
+        baton->subifds = image.get_int(VIPS_META_N_SUBIFDS);
+      }
       baton->hasProfile = sharp::HasProfile(image);
+      if (image.get_typeof("background") == VIPS_TYPE_ARRAY_DOUBLE) {
+        baton->background = image.get_array_double("background");
+      }
       // Derived attributes
       baton->hasAlpha = sharp::HasAlpha(image);
       baton->orientation = sharp::ExifOrientation(image);
@@ -98,6 +131,14 @@ class MetadataWorker : public Nan::AsyncWorker {
         memcpy(baton->xmp, xmp, xmpLength);
         baton->xmpLength = xmpLength;
       }
+      // TIFFTAG_PHOTOSHOP
+      if (image.get_typeof(VIPS_META_PHOTOSHOP_NAME) == VIPS_TYPE_BLOB) {
+        size_t tifftagPhotoshopLength;
+        void const *tifftagPhotoshop = image.get_blob(VIPS_META_PHOTOSHOP_NAME, &tifftagPhotoshopLength);
+        baton->tifftagPhotoshop = static_cast<char *>(g_malloc(tifftagPhotoshopLength));
+        memcpy(baton->tifftagPhotoshop, tifftagPhotoshop, tifftagPhotoshopLength);
+        baton->tifftagPhotoshopLength = tifftagPhotoshopLength;
+      }
     }
 
     // Clean up
@@ -105,102 +146,146 @@ class MetadataWorker : public Nan::AsyncWorker {
     vips_thread_shutdown();
   }
 
-  void HandleOKCallback() {
+  void OnOK() {
-    using Nan::New;
+    Napi::Env env = Env();
-    using Nan::Set;
+    Napi::HandleScope scope(env);
-    Nan::HandleScope();
-
-    v8::Local<v8::Value> argv[2] = { Nan::Null(), Nan::Null() };
-    if (!baton->err.empty()) {
-      argv[0] = Nan::Error(baton->err.data());
-    } else {
-      // Metadata Object
-      v8::Local<v8::Object> info = New<v8::Object>();
-      Set(info, New("format").ToLocalChecked(), New<v8::String>(baton->format).ToLocalChecked());
-      Set(info, New("width").ToLocalChecked(), New<v8::Uint32>(baton->width));
-      Set(info, New("height").ToLocalChecked(), New<v8::Uint32>(baton->height));
-      Set(info, New("space").ToLocalChecked(), New<v8::String>(baton->space).ToLocalChecked());
-      Set(info, New("channels").ToLocalChecked(), New<v8::Uint32>(baton->channels));
-      Set(info, New("depth").ToLocalChecked(), New<v8::String>(baton->depth).ToLocalChecked());
-      if (baton->density > 0) {
-        Set(info, New("density").ToLocalChecked(), New<v8::Uint32>(baton->density));
-      }
-      Set(info, New("hasProfile").ToLocalChecked(), New<v8::Boolean>(baton->hasProfile));
-      Set(info, New("hasAlpha").ToLocalChecked(), New<v8::Boolean>(baton->hasAlpha));
-      if (baton->orientation > 0) {
-        Set(info, New("orientation").ToLocalChecked(), New<v8::Uint32>(baton->orientation));
-      }
-      if (baton->exifLength > 0) {
-        Set(info,
-          New("exif").ToLocalChecked(),
-          Nan::NewBuffer(baton->exif, baton->exifLength, sharp::FreeCallback, nullptr).ToLocalChecked());
-      }
-      if (baton->iccLength > 0) {
-        Set(info,
-          New("icc").ToLocalChecked(),
-          Nan::NewBuffer(baton->icc, baton->iccLength, sharp::FreeCallback, nullptr).ToLocalChecked());
-      }
-      if (baton->iptcLength > 0) {
-        Set(info,
-          New("iptc").ToLocalChecked(),
-          Nan::NewBuffer(baton->iptc, baton->iptcLength, sharp::FreeCallback, nullptr).ToLocalChecked());
-      }
-      if (baton->xmpLength > 0) {
-        Set(info,
-          New("xmp").ToLocalChecked(),
-          Nan::NewBuffer(baton->xmp, baton->xmpLength, sharp::FreeCallback, nullptr).ToLocalChecked());
-      }
-      argv[1] = info;
-    }
-
-    // Dispose of Persistent wrapper around input Buffers so they can be garbage collected
-    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
-      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
-        GetFromPersistent(index);
-        return index + 1;
-      });
-    delete baton->input;
-    delete baton;
 
     // Handle warnings
     std::string warning = sharp::VipsWarningPop();
     while (!warning.empty()) {
-      v8::Local<v8::Value> message[1] = { New(warning).ToLocalChecked() };
+      debuglog.Call({ Napi::String::New(env, warning) });
-      debuglog->Call(1, message, async_resource);
       warning = sharp::VipsWarningPop();
     }
 
-    // Return to JavaScript
+    if (baton->err.empty()) {
-    callback->Call(2, argv, async_resource);
+      Napi::Object info = Napi::Object::New(env);
+      info.Set("format", baton->format);
+      if (baton->input->bufferLength > 0) {
+        info.Set("size", baton->input->bufferLength);
+      }
+      info.Set("width", baton->width);
+      info.Set("height", baton->height);
+      info.Set("space", baton->space);
+      info.Set("channels", baton->channels);
+      info.Set("depth", baton->depth);
+      if (baton->density > 0) {
+        info.Set("density", baton->density);
+      }
+      if (!baton->chromaSubsampling.empty()) {
+        info.Set("chromaSubsampling", baton->chromaSubsampling);
+      }
+      info.Set("isProgressive", baton->isProgressive);
+      if (baton->paletteBitDepth > 0) {
+        info.Set("paletteBitDepth", baton->paletteBitDepth);
+      }
+      if (baton->pages > 0) {
+        info.Set("pages", baton->pages);
+      }
+      if (baton->pageHeight > 0) {
+        info.Set("pageHeight", baton->pageHeight);
+      }
+      if (baton->loop >= 0) {
+        info.Set("loop", baton->loop);
+      }
+      if (!baton->delay.empty()) {
+        int i = 0;
+        Napi::Array delay = Napi::Array::New(env, static_cast<size_t>(baton->delay.size()));
+        for (int const d : baton->delay) {
+          delay.Set(i++, d);
+        }
+        info.Set("delay", delay);
+      }
+      if (baton->pagePrimary > -1) {
+        info.Set("pagePrimary", baton->pagePrimary);
+      }
+      if (!baton->compression.empty()) {
+        info.Set("compression", baton->compression);
+      }
+      if (!baton->resolutionUnit.empty()) {
+        info.Set("resolutionUnit", baton->resolutionUnit == "in" ? "inch" : baton->resolutionUnit);
+      }
+      if (!baton->levels.empty()) {
+        int i = 0;
+        Napi::Array levels = Napi::Array::New(env, static_cast<size_t>(baton->levels.size()));
+        for (std::pair<int, int> const &l : baton->levels) {
+          Napi::Object level = Napi::Object::New(env);
+          level.Set("width", l.first);
+          level.Set("height", l.second);
+          levels.Set(i++, level);
+        }
+        info.Set("levels", levels);
+      }
+      if (baton->subifds > 0) {
+        info.Set("subifds", baton->subifds);
+      }
+      if (!baton->background.empty()) {
+        if (baton->background.size() == 3) {
+          Napi::Object background = Napi::Object::New(env);
+          background.Set("r", baton->background[0]);
+          background.Set("g", baton->background[1]);
+          background.Set("b", baton->background[2]);
+          info.Set("background", background);
+        } else {
+          info.Set("background", baton->background[0]);
+        }
+      }
+      info.Set("hasProfile", baton->hasProfile);
+      info.Set("hasAlpha", baton->hasAlpha);
+      if (baton->orientation > 0) {
+        info.Set("orientation", baton->orientation);
+      }
+      if (baton->exifLength > 0) {
+        info.Set("exif", sharp::NewOrCopyBuffer(env, baton->exif, baton->exifLength));
+      }
+      if (baton->iccLength > 0) {
+        info.Set("icc", sharp::NewOrCopyBuffer(env, baton->icc, baton->iccLength));
+      }
+      if (baton->iptcLength > 0) {
+        info.Set("iptc", sharp::NewOrCopyBuffer(env, baton->iptc, baton->iptcLength));
+      }
+      if (baton->xmpLength > 0) {
+        info.Set("xmp", sharp::NewOrCopyBuffer(env, baton->xmp, baton->xmpLength));
+      }
+      if (baton->tifftagPhotoshopLength > 0) {
+        info.Set("tifftagPhotoshop",
+          sharp::NewOrCopyBuffer(env, baton->tifftagPhotoshop, baton->tifftagPhotoshopLength));
+      }
+      Callback().MakeCallback(Receiver().Value(), { env.Null(), info });
+    } else {
+      Callback().MakeCallback(Receiver().Value(), { Napi::Error::New(env, baton->err).Value() });
+    }
+
+    delete baton->input;
+    delete baton;
   }
 
  private:
   MetadataBaton* baton;
-  Nan::Callback *debuglog;
+  Napi::FunctionReference debuglog;
-  std::vector<v8::Local<v8::Object>> buffersToPersist;
 };
 
 /*
   metadata(options, callback)
 */
-NAN_METHOD(metadata) {
+Napi::Value metadata(const Napi::CallbackInfo& info) {
-  // Input Buffers must not undergo GC compaction during processing
-  std::vector<v8::Local<v8::Object>> buffersToPersist;
-
   // V8 objects are converted to non-V8 types held in the baton struct
   MetadataBaton *baton = new MetadataBaton;
-  v8::Local<v8::Object> options = info[0].As<v8::Object>();
+  Napi::Object options = info[0].As<Napi::Object>();
 
   // Input
-  baton->input = sharp::CreateInputDescriptor(sharp::AttrAs<v8::Object>(options, "input"), buffersToPersist);
+  baton->input = sharp::CreateInputDescriptor(options.Get("input").As<Napi::Object>());
 
   // Function to notify of libvips warnings
-  Nan::Callback *debuglog = new Nan::Callback(sharp::AttrAs<v8::Function>(options, "debuglog"));
+  Napi::Function debuglog = options.Get("debuglog").As<Napi::Function>();
 
   // Join queue for worker thread
-  Nan::Callback *callback = new Nan::Callback(info[1].As<v8::Function>());
+  Napi::Function callback = info[1].As<Napi::Function>();
-  Nan::AsyncQueueWorker(new MetadataWorker(callback, baton, debuglog, buffersToPersist));
+  MetadataWorker *worker = new MetadataWorker(callback, baton, debuglog);
+  worker->Receiver().Set("options", options);
+  worker->Queue();
 
   // Increment queued task counter
   g_atomic_int_inc(&sharp::counterQueue);
+
+  return info.Env().Undefined();
 }

src/metadata.h

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,7 +16,7 @@
 #define SRC_METADATA_H_
 
 #include <string>
-#include <nan.h>
+#include <napi.h>
 
 #include "./common.h"
 
@@ -31,6 +31,19 @@ struct MetadataBaton {
   int channels;
   std::string depth;
   int density;
+  std::string chromaSubsampling;
+  bool isProgressive;
+  int paletteBitDepth;
+  int pages;
+  int pageHeight;
+  int loop;
+  std::vector<int> delay;
+  int pagePrimary;
+  std::string compression;
+  std::string resolutionUnit;
+  std::vector<std::pair<int, int>> levels;
+  int subifds;
+  std::vector<double> background;
   bool hasProfile;
   bool hasAlpha;
   int orientation;
@@ -42,6 +55,8 @@ struct MetadataBaton {
   size_t iptcLength;
   char *xmp;
   size_t xmpLength;
+  char *tifftagPhotoshop;
+  size_t tifftagPhotoshopLength;
   std::string err;
 
   MetadataBaton():
@@ -50,6 +65,13 @@ struct MetadataBaton {
     height(0),
     channels(0),
     density(0),
+    isProgressive(false),
+    paletteBitDepth(0),
+    pages(0),
+    pageHeight(0),
+    loop(-1),
+    pagePrimary(-1),
+    subifds(0),
     hasProfile(false),
     hasAlpha(false),
     orientation(0),
@@ -60,9 +82,11 @@ struct MetadataBaton {
     iptc(nullptr),
     iptcLength(0),
     xmp(nullptr),
-    xmpLength(0) {}
+    xmpLength(0),
+    tifftagPhotoshop(nullptr),
+    tifftagPhotoshopLength(0) {}
 };
 
-NAN_METHOD(metadata);
+Napi::Value metadata(const Napi::CallbackInfo& info);
 
 #endif  // SRC_METADATA_H_

src/operations.cc

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -27,141 +27,6 @@ using vips::VImage;
 using vips::VError;
 
 namespace sharp {
-
-  /*
-    Removes alpha channel, if any.
-  */
-  VImage RemoveAlpha(VImage image) {
-    if (HasAlpha(image)) {
-      image = image.extract_band(0, VImage::option()->set("n", image.bands() - 1));
-    }
-    return image;
-  }
-
-  /*
-    Composite overlayImage over image at given position
-    Assumes alpha channels are already premultiplied and will be unpremultiplied after
-   */
-  VImage Composite(VImage image, VImage overlayImage, int const left, int const top) {
-    if (HasAlpha(overlayImage)) {
-      // Alpha composite
-      if (overlayImage.width() < image.width() || overlayImage.height() < image.height()) {
-        // Enlarge overlay
-        std::vector<double> const background { 0.0, 0.0, 0.0, 0.0 };
-        overlayImage = overlayImage.embed(left, top, image.width(), image.height(), VImage::option()
-          ->set("extend", VIPS_EXTEND_BACKGROUND)
-          ->set("background", background));
-      }
-      return AlphaComposite(image, overlayImage);
-    } else {
-      if (HasAlpha(image)) {
-        // Add alpha channel to overlayImage so channels match
-        double const multiplier = sharp::Is16Bit(overlayImage.interpretation()) ? 256.0 : 1.0;
-        overlayImage = overlayImage.bandjoin(
-          VImage::new_matrix(overlayImage.width(), overlayImage.height()).new_from_image(255 * multiplier));
-      }
-      return image.insert(overlayImage, left, top);
-    }
-  }
-
-  VImage AlphaComposite(VImage dst, VImage src) {
-    // Split src into non-alpha and alpha channels
-    VImage srcWithoutAlpha = src.extract_band(0, VImage::option()->set("n", src.bands() - 1));
-    VImage srcAlpha = src[src.bands() - 1] * (1.0 / 255.0);
-
-    // Split dst into non-alpha and alpha channels
-    VImage dstWithoutAlpha = dst.extract_band(0, VImage::option()->set("n", dst.bands() - 1));
-    VImage dstAlpha = dst[dst.bands() - 1] * (1.0 / 255.0);
-
-    //
-    // Compute normalized output alpha channel:
-    //
-    // References:
-    // - http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
-    // - https://github.com/jcupitt/ruby-vips/issues/28#issuecomment-9014826
-    //
-    // out_a = src_a + dst_a * (1 - src_a)
-    //                         ^^^^^^^^^^^
-    //                            t0
-    VImage t0 = srcAlpha.linear(-1.0, 1.0);
-    VImage outAlphaNormalized = srcAlpha + dstAlpha * t0;
-
-    //
-    // Compute output RGB channels:
-    //
-    // Wikipedia:
-    // out_rgb = (src_rgb * src_a + dst_rgb * dst_a * (1 - src_a)) / out_a
-    //                                                ^^^^^^^^^^^
-    //                                                    t0
-    //
-    // Omit division by `out_a` since `Compose` is supposed to output a
-    // premultiplied RGBA image as reversal of premultiplication is handled
-    // externally.
-    //
-    VImage outRGBPremultiplied = srcWithoutAlpha + dstWithoutAlpha * t0;
-
-    // Combine RGB and alpha channel into output image:
-    return outRGBPremultiplied.bandjoin(outAlphaNormalized * 255.0);
-  }
-
-  /*
-    Cutout src over dst with given gravity.
-   */
-  VImage Cutout(VImage mask, VImage dst, const int gravity) {
-    using sharp::CalculateCrop;
-    using sharp::HasAlpha;
-    using sharp::MaximumImageAlpha;
-
-    bool maskHasAlpha = HasAlpha(mask);
-
-    if (!maskHasAlpha && mask.bands() > 1) {
-      throw VError("Overlay image must have an alpha channel or one band");
-    }
-    if (!HasAlpha(dst)) {
-      throw VError("Image to be overlaid must have an alpha channel");
-    }
-    if (mask.width() > dst.width() || mask.height() > dst.height()) {
-      throw VError("Overlay image must have same dimensions or smaller");
-    }
-
-    // Enlarge overlay mask, if required
-    if (mask.width() < dst.width() || mask.height() < dst.height()) {
-      // Calculate the (left, top) coordinates of the output image within the input image, applying the given gravity.
-      int left;
-      int top;
-      std::tie(left, top) = CalculateCrop(dst.width(), dst.height(), mask.width(), mask.height(), gravity);
-      // Embed onto transparent background
-      std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
-      mask = mask.embed(left, top, dst.width(), dst.height(), VImage::option()
-              ->set("extend", VIPS_EXTEND_BACKGROUND)
-              ->set("background", background));
-    }
-
-    // we use the mask alpha if it has alpha
-    if (maskHasAlpha) {
-      mask = mask.extract_band(mask.bands() - 1, VImage::option()->set("n", 1));;
-    }
-
-    // Split dst into an optional alpha
-    VImage dstAlpha = dst.extract_band(dst.bands() - 1, VImage::option()->set("n", 1));
-
-    // we use the dst non-alpha
-    dst = dst.extract_band(0, VImage::option()->set("n", dst.bands() - 1));
-
-    // the range of the mask and the image need to match .. one could be
-    // 16-bit, one 8-bit
-    double const dstMax = MaximumImageAlpha(dst.interpretation());
-    double const maskMax = MaximumImageAlpha(mask.interpretation());
-
-    // combine the new mask and the existing alpha ... there are
-    // many ways of doing this, mult is the simplest
-    mask = dstMax * ((mask / maskMax) * (dstAlpha / dstMax));
-
-    // append the mask to the image data ... the mask might be float now,
-    // we must cast the format down to match the image data
-    return dst.bandjoin(mask.cast(dst.format()));
-  }
-
   /*
    * Tint an image using the specified chroma, preserving the original image luminance
    */
@@ -203,10 +68,9 @@ namespace sharp {
     // Extract luminance
     VImage luminance = lab[0];
     // Find luminance range
-    VImage stats = luminance.stats();
+    int const min = luminance.percent(1);
-    double min = stats(0, 0)[0];
+    int const max = luminance.percent(99);
-    double max = stats(1, 0)[0];
+    if (std::abs(max - min) > 1) {
-    if (min != max) {
       // Extract chroma
       VImage chroma = lab.extract_band(1, VImage::option()->set("n", 2));
       // Calculate multiplication factor and addition
@@ -227,6 +91,13 @@ namespace sharp {
     return image;
   }
 
+  /*
+   * Contrast limiting adapative histogram equalization (CLAHE)
+   */
+  VImage Clahe(VImage image, int const width, int const height, int const maxSlope) {
+    return image.hist_local(width, height, VImage::option()->set("max_slope", maxSlope));
+  }
+
   /*
    * Gamma encoding/decoding
    */
@@ -240,6 +111,32 @@ namespace sharp {
     }
   }
 
+  /*
+   * Flatten image to remove alpha channel
+   */
+  VImage Flatten(VImage image, std::vector<double> flattenBackground) {
+    double const multiplier = sharp::Is16Bit(image.interpretation()) ? 256.0 : 1.0;
+    std::vector<double> background {
+      flattenBackground[0] * multiplier,
+      flattenBackground[1] * multiplier,
+      flattenBackground[2] * multiplier
+    };
+    return image.flatten(VImage::option()->set("background", background));
+  }
+
+  /**
+   * Produce the "negative" of the image.
+   */
+  VImage Negate(VImage image, bool const negateAlpha) {
+    if (HasAlpha(image) && !negateAlpha) {
+      // Separate alpha channel
+      VImage alpha = image[image.bands() - 1];
+      return RemoveAlpha(image).invert().bandjoin(alpha);
+    } else {
+      return image.invert();
+    }
+  }
+
   /*
    * Gaussian blur. Use sigma of -1.0 for fast blur.
    */
@@ -278,10 +175,54 @@ namespace sharp {
     return image.conv(kernel);
   }
 
+  /*
+   * Recomb with a Matrix of the given bands/channel size.
+   * Eg. RGB will be a 3x3 matrix.
+   */
+  VImage Recomb(VImage image, std::unique_ptr<double[]> const &matrix) {
+    double *m = matrix.get();
+    image = image.colourspace(VIPS_INTERPRETATION_sRGB);
+    return image
+      .recomb(image.bands() == 3
+        ? VImage::new_from_memory(
+          m, 9 * sizeof(double), 3, 3, 1, VIPS_FORMAT_DOUBLE
+        )
+        : VImage::new_matrixv(4, 4,
+          m[0], m[1], m[2], 0.0,
+          m[3], m[4], m[5], 0.0,
+          m[6], m[7], m[8], 0.0,
+          0.0, 0.0, 0.0, 1.0));
+  }
+
+  VImage Modulate(VImage image, double const brightness, double const saturation,
+                  int const hue, double const lightness) {
+    if (HasAlpha(image)) {
+      // Separate alpha channel
+      VImage alpha = image[image.bands() - 1];
+      return RemoveAlpha(image)
+        .colourspace(VIPS_INTERPRETATION_LCH)
+        .linear(
+          { brightness, saturation, 1},
+          { lightness, 0.0, static_cast<double>(hue) }
+        )
+        .colourspace(VIPS_INTERPRETATION_sRGB)
+        .bandjoin(alpha);
+    } else {
+      return image
+        .colourspace(VIPS_INTERPRETATION_LCH)
+        .linear(
+          { brightness, saturation, 1 },
+          { lightness, 0.0, static_cast<double>(hue) }
+        )
+        .colourspace(VIPS_INTERPRETATION_sRGB);
+    }
+  }
+
   /*
    * Sharpen flat and jagged areas. Use sigma of -1.0 for fast sharpen.
    */
-  VImage Sharpen(VImage image, double const sigma, double const flat, double const jagged) {
+  VImage Sharpen(VImage image, double const sigma, double const m1, double const m2,
+    double const x1, double const y2, double const y3) {
     if (sigma == -1.0) {
       // Fast, mild sharpen
       VImage sharpen = VImage::new_matrixv(3, 3,
@@ -296,8 +237,14 @@ namespace sharp {
       if (colourspaceBeforeSharpen == VIPS_INTERPRETATION_RGB) {
         colourspaceBeforeSharpen = VIPS_INTERPRETATION_sRGB;
       }
-      return image.sharpen(
+      return image
-        VImage::option()->set("sigma", sigma)->set("m1", flat)->set("m2", jagged))
+        .sharpen(VImage::option()
+          ->set("sigma", sigma)
+          ->set("m1", m1)
+          ->set("m2", m2)
+          ->set("x1", x1)
+          ->set("y2", y2)
+          ->set("y3", y3))
         .colourspace(colourspaceBeforeSharpen);
     }
   }
@@ -324,68 +271,189 @@ namespace sharp {
     return image.boolean(imageR, boolean);
   }
 
-  VImage Trim(VImage image, int const tolerance) {
+  /*
-    using sharp::MaximumImageAlpha;
+    Trim an image
-    // An equivalent of ImageMagick's -trim in C++ ... automatically remove
+  */
-    // "boring" image edges.
+  VImage Trim(VImage image, std::vector<double> background, double threshold) {
-
+    if (image.width() < 3 && image.height() < 3) {
-    // We use .project to sum the rows and columns of a 0/255 mask image, the first
+      throw VError("Image to trim must be at least 3x3 pixels");
-    // non-zero row or column is the object edge. We make the mask image with an
-    // amount-different-from-background image plus a threshold.
-
-    // find the value of the pixel at (0, 0) ... we will search for all pixels
-    // significantly different from this
-    std::vector<double> background = image(0, 0);
-
-    double const max = MaximumImageAlpha(image.interpretation());
-
-    // we need to smooth the image, subtract the background from every pixel, take
-    // the absolute value of the difference, then threshold
-    VImage mask = (image.median(3) - background).abs() > (max * tolerance / 100);
-
-    // sum mask rows and columns, then search for the first non-zero sum in each
-    // direction
-    VImage rows;
-    VImage columns = mask.project(&rows);
-
-    VImage profileLeftV;
-    VImage profileLeftH = columns.profile(&profileLeftV);
-
-    VImage profileRightV;
-    VImage profileRightH = columns.fliphor().profile(&profileRightV);
-
-    VImage profileTopV;
-    VImage profileTopH = rows.profile(&profileTopV);
-
-    VImage profileBottomV;
-    VImage profileBottomH = rows.flipver().profile(&profileBottomV);
-
-    int left = static_cast<int>(floor(profileLeftV.min()));
-    int right = columns.width() - static_cast<int>(floor(profileRightV.min()));
-    int top = static_cast<int>(floor(profileTopH.min()));
-    int bottom = rows.height() - static_cast<int>(floor(profileBottomH.min()));
-
-    int width = right - left;
-    int height = bottom - top;
-
-    if (width <= 0 || height <= 0) {
-      throw VError("Unexpected error while trimming. Try to lower the tolerance");
     }
 
-    // and now crop the original image
+    // Scale up 8-bit values to match 16-bit input image
-    return image.extract_area(left, top, width, height);
+    double multiplier = sharp::Is16Bit(image.interpretation()) ? 256.0 : 1.0;
+    threshold *= multiplier;
+
+    std::vector<double> backgroundAlpha(1);
+    if (background.size() == 0) {
+      // Top-left pixel provides the default background colour if none is given
+      background = image.extract_area(0, 0, 1, 1)(0, 0);
+      multiplier = 1.0;
+    }
+    if (HasAlpha(image) && background.size() == 4) {
+      // Just discard the alpha because flattening the background colour with
+      // itself (effectively what find_trim() does) gives the same result
+      backgroundAlpha[0] = background[3] * multiplier;
+    }
+    if (image.bands() > 2) {
+      background = {
+        background[0] * multiplier,
+        background[1] * multiplier,
+        background[2] * multiplier
+      };
+    } else {
+      background[0] = background[0] * multiplier;
+    }
+    int left, top, width, height;
+    left = image.find_trim(&top, &width, &height, VImage::option()
+      ->set("background", background)
+      ->set("threshold", threshold));
+    if (HasAlpha(image)) {
+      // Search alpha channel (A)
+      int leftA, topA, widthA, heightA;
+      VImage alpha = image[image.bands() - 1];
+      leftA = alpha.find_trim(&topA, &widthA, &heightA, VImage::option()
+        ->set("background", backgroundAlpha)
+        ->set("threshold", threshold));
+      if (widthA > 0 && heightA > 0) {
+        if (width > 0 && height > 0) {
+          // Combined bounding box (B)
+          int const leftB = std::min(left, leftA);
+          int const topB = std::min(top, topA);
+          int const widthB = std::max(left + width, leftA + widthA) - leftB;
+          int const heightB = std::max(top + height, topA + heightA) - topB;
+          return image.extract_area(leftB, topB, widthB, heightB);
+        } else {
+          // Use alpha only
+          return image.extract_area(leftA, topA, widthA, heightA);
+        }
+      }
+    }
+    if (width > 0 && height > 0) {
+      return image.extract_area(left, top, width, height);
+    }
+    return image;
   }
 
   /*
    * Calculate (a * in + b)
    */
-  VImage Linear(VImage image, double const a, double const b) {
+  VImage Linear(VImage image, std::vector<double> const a, std::vector<double> const b) {
-    if (HasAlpha(image)) {
+    size_t const bands = static_cast<size_t>(image.bands());
+    if (a.size() > bands) {
+      throw VError("Band expansion using linear is unsupported");
+    }
+    if (HasAlpha(image) && a.size() != bands && (a.size() == 1 || a.size() == bands - 1 || bands - 1 == 1)) {
       // Separate alpha channel
-      VImage alpha = image[image.bands() - 1];
+      VImage alpha = image[bands - 1];
-      return RemoveAlpha(image).linear(a, b).bandjoin(alpha);
+      return RemoveAlpha(image).linear(a, b, VImage::option()->set("uchar", TRUE)).bandjoin(alpha);
     } else {
-      return image.linear(a, b);
+      return image.linear(a, b, VImage::option()->set("uchar", TRUE));
     }
   }
+
+  /*
+   * Ensure the image is in a given colourspace
+   */
+  VImage EnsureColourspace(VImage image, VipsInterpretation colourspace) {
+    if (colourspace != VIPS_INTERPRETATION_LAST && image.interpretation() != colourspace) {
+      image = image.colourspace(colourspace,
+        VImage::option()->set("source_space", image.interpretation()));
+    }
+    return image;
+  }
+
+  /*
+   * Split and crop each frame, reassemble, and update pageHeight.
+   */
+  VImage CropMultiPage(VImage image, int left, int top, int width, int height,
+                       int nPages, int *pageHeight) {
+    if (top == 0 && height == *pageHeight) {
+      // Fast path; no need to adjust the height of the multi-page image
+      return image.extract_area(left, 0, width, image.height());
+    } else {
+      std::vector<VImage> pages;
+      pages.reserve(nPages);
+
+      // Split the image into cropped frames
+      for (int i = 0; i < nPages; i++) {
+        pages.push_back(
+          image.extract_area(left, *pageHeight * i + top, width, height));
+      }
+
+      // Reassemble the frames into a tall, thin image
+      VImage assembled = VImage::arrayjoin(pages,
+        VImage::option()->set("across", 1));
+
+      // Update the page height
+      *pageHeight = height;
+
+      return assembled;
+    }
+  }
+
+  /*
+   * Split into frames, embed each frame, reassemble, and update pageHeight.
+   */
+  VImage EmbedMultiPage(VImage image, int left, int top, int width, int height,
+                        std::vector<double> background, int nPages, int *pageHeight) {
+    if (top == 0 && height == *pageHeight) {
+      // Fast path; no need to adjust the height of the multi-page image
+      return image.embed(left, 0, width, image.height(), VImage::option()
+        ->set("extend", VIPS_EXTEND_BACKGROUND)
+        ->set("background", background));
+    } else if (left == 0 && width == image.width()) {
+      // Fast path; no need to adjust the width of the multi-page image
+      std::vector<VImage> pages;
+      pages.reserve(nPages);
+
+      // Rearrange the tall image into a vertical grid
+      image = image.grid(*pageHeight, nPages, 1);
+
+      // Do the embed on the wide image
+      image = image.embed(0, top, image.width(), height, VImage::option()
+        ->set("extend", VIPS_EXTEND_BACKGROUND)
+        ->set("background", background));
+
+      // Split the wide image into frames
+      for (int i = 0; i < nPages; i++) {
+        pages.push_back(
+          image.extract_area(width * i, 0, width, height));
+      }
+
+      // Reassemble the frames into a tall, thin image
+      VImage assembled = VImage::arrayjoin(pages,
+        VImage::option()->set("across", 1));
+
+      // Update the page height
+      *pageHeight = height;
+
+      return assembled;
+    } else {
+      std::vector<VImage> pages;
+      pages.reserve(nPages);
+
+      // Split the image into frames
+      for (int i = 0; i < nPages; i++) {
+        pages.push_back(
+          image.extract_area(0, *pageHeight * i, image.width(), *pageHeight));
+      }
+
+      // Embed each frame in the target size
+      for (int i = 0; i < nPages; i++) {
+        pages[i] = pages[i].embed(left, top, width, height, VImage::option()
+          ->set("extend", VIPS_EXTEND_BACKGROUND)
+          ->set("background", background));
+      }
+
+      // Reassemble the frames into a tall, thin image
+      VImage assembled = VImage::arrayjoin(pages,
+        VImage::option()->set("across", 1));
+
+      // Update the page height
+      *pageHeight = height;
+
+      return assembled;
+    }
+  }
+
 }  // namespace sharp

src/operations.h

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -25,32 +25,6 @@ using vips::VImage;
 
 namespace sharp {
 
-  /*
-    Removes alpha channel, if any.
-  */
-  VImage RemoveAlpha(VImage image);
-
-  /*
-    Alpha composite src over dst with given gravity.
-    Assumes alpha channels are already premultiplied and will be unpremultiplied after.
-   */
-  VImage Composite(VImage src, VImage dst, const int gravity);
-
-  /*
-    Composite overlayImage over image at given position
-   */
-  VImage Composite(VImage image, VImage overlayImage, int const x, int const y);
-
-  /*
-    Alpha composite overlayImage over image, assumes matching dimensions
-  */
-  VImage AlphaComposite(VImage image, VImage overlayImage);
-
-  /*
-    Cutout src over dst with given gravity.
-  */
-  VImage Cutout(VImage src, VImage dst, const int gravity);
-
   /*
    * Tint an image using the specified chroma, preserving the original image luminance
    */
@@ -61,11 +35,26 @@ namespace sharp {
    */
   VImage Normalise(VImage image);
 
+  /*
+   * Contrast limiting adapative histogram equalization (CLAHE)
+   */
+  VImage Clahe(VImage image, int const width, int const height, int const maxSlope);
+
   /*
    * Gamma encoding/decoding
    */
   VImage Gamma(VImage image, double const exponent);
 
+  /*
+   * Flatten image to remove alpha channel
+   */
+  VImage Flatten(VImage image, std::vector<double> flattenBackground);
+
+  /*
+   * Produce the "negative" of the image.
+   */
+  VImage Negate(VImage image, bool const negateAlpha);
+
   /*
    * Gaussian blur. Use sigma of -1.0 for fast blur.
    */
@@ -80,7 +69,8 @@ namespace sharp {
   /*
    * Sharpen flat and jagged areas. Use sigma of -1.0 for fast sharpen.
    */
-  VImage Sharpen(VImage image, double const sigma, double const flat, double const jagged);
+  VImage Sharpen(VImage image, double const sigma, double const m1, double const m2,
+    double const x1, double const y2, double const y3);
 
   /*
     Threshold an image
@@ -100,12 +90,41 @@ namespace sharp {
   /*
     Trim an image
   */
-  VImage Trim(VImage image, int const tolerance);
+  VImage Trim(VImage image, std::vector<double> background, double const threshold);
 
   /*
    * Linear adjustment (a * in + b)
    */
-  VImage Linear(VImage image, double const a, double const b);
+  VImage Linear(VImage image, std::vector<double> const a,  std::vector<double> const b);
+
+  /*
+   * Recomb with a Matrix of the given bands/channel size.
+   * Eg. RGB will be a 3x3 matrix.
+   */
+  VImage Recomb(VImage image, std::unique_ptr<double[]> const &matrix);
+
+  /*
+   * Modulate brightness, saturation, hue and lightness
+   */
+  VImage Modulate(VImage image, double const brightness, double const saturation,
+                  int const hue, double const lightness);
+
+  /*
+   * Ensure the image is in a given colourspace
+   */
+  VImage EnsureColourspace(VImage image, VipsInterpretation colourspace);
+
+  /*
+   * Split and crop each frame, reassemble, and update pageHeight.
+   */
+  VImage CropMultiPage(VImage image, int left, int top, int width, int height,
+                       int nPages, int *pageHeight);
+
+  /*
+   * Split into frames, embed each frame, reassemble, and update pageHeight.
+   */
+  VImage EmbedMultiPage(VImage image, int left, int top, int width, int height,
+                        std::vector<double> background, int nPages, int *pageHeight);
 
 }  // namespace sharp
 

src/pipeline.h

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -18,36 +18,43 @@
 #include <memory>
 #include <string>
 #include <vector>
+#include <unordered_map>
 
-#include <nan.h>
+#include <napi.h>
 #include <vips/vips8>
 
 #include "./common.h"
 
-NAN_METHOD(pipeline);
+Napi::Value pipeline(const Napi::CallbackInfo& info);
 
-enum class Canvas {
+struct Composite {
-  CROP,
+  sharp::InputDescriptor *input;
-  EMBED,
+  VipsBlendMode mode;
-  MAX,
+  int gravity;
-  MIN,
+  int left;
-  IGNORE_ASPECT
+  int top;
+  bool hasOffset;
+  bool tile;
+  bool premultiplied;
+
+  Composite():
+    input(nullptr),
+    mode(VIPS_BLEND_MODE_OVER),
+    gravity(0),
+    left(0),
+    top(0),
+    hasOffset(false),
+    tile(false),
+    premultiplied(false) {}
 };
 
 struct PipelineBaton {
   sharp::InputDescriptor *input;
-  std::string iccProfilePath;
-  int limitInputPixels;
   std::string formatOut;
   std::string fileOut;
   void *bufferOut;
   size_t bufferOutLength;
-  sharp::InputDescriptor *overlay;
+  std::vector<Composite *> composite;
-  int overlayGravity;
-  int overlayXOffset;
-  int overlayYOffset;
-  bool overlayTile;
-  bool overlayCutout;
   std::vector<sharp::InputDescriptor *> joinChannelIn;
   int topOffsetPre;
   int leftOffsetPre;
@@ -60,35 +67,53 @@ struct PipelineBaton {
   int width;
   int height;
   int channels;
-  Canvas canvas;
+  VipsKernel kernel;
-  int crop;
+  sharp::Canvas canvas;
-  int embed;
+  int position;
+  std::vector<double> resizeBackground;
   bool hasCropOffset;
   int cropOffsetLeft;
   int cropOffsetTop;
   bool premultiplied;
-  std::string kernel;
+  bool tileCentre;
   bool fastShrinkOnLoad;
-  double background[4];
   double tintA;
   double tintB;
   bool flatten;
+  std::vector<double> flattenBackground;
   bool negate;
+  bool negateAlpha;
   double blurSigma;
+  double brightness;
+  double saturation;
+  int hue;
+  double lightness;
   int medianSize;
   double sharpenSigma;
-  double sharpenFlat;
+  double sharpenM1;
-  double sharpenJagged;
+  double sharpenM2;
+  double sharpenX1;
+  double sharpenY2;
+  double sharpenY3;
   int threshold;
   bool thresholdGrayscale;
-  int trimTolerance;
+  std::vector<double> trimBackground;
-  double linearA;
+  double trimThreshold;
-  double linearB;
+  int trimOffsetLeft;
+  int trimOffsetTop;
+  std::vector<double> linearA;
+  std::vector<double> linearB;
   double gamma;
+  double gammaOut;
   bool greyscale;
   bool normalise;
+  int claheWidth;
+  int claheHeight;
+  int claheMaxSlope;
   bool useExifOrientation;
   int angle;
+  double rotationAngle;
+  std::vector<double> rotationBackground;
   bool rotateBeforePreExtract;
   bool flip;
   bool flop;
@@ -96,8 +121,16 @@ struct PipelineBaton {
   int extendBottom;
   int extendLeft;
   int extendRight;
+  std::vector<double> extendBackground;
   bool withoutEnlargement;
-  VipsAccess accessMethod;
+  bool withoutReduction;
+  std::vector<double> affineMatrix;
+  std::vector<double> affineBackground;
+  double affineIdx;
+  double affineIdy;
+  double affineOdx;
+  double affineOdy;
+  std::string affineInterpolator;
   int jpegQuality;
   bool jpegProgressive;
   std::string jpegChromaSubsampling;
@@ -109,19 +142,58 @@ struct PipelineBaton {
   bool pngProgressive;
   int pngCompressionLevel;
   bool pngAdaptiveFiltering;
+  bool pngPalette;
+  int pngQuality;
+  int pngEffort;
+  int pngBitdepth;
+  double pngDither;
+  int jp2Quality;
+  bool jp2Lossless;
+  int jp2TileHeight;
+  int jp2TileWidth;
+  std::string jp2ChromaSubsampling;
   int webpQuality;
   int webpAlphaQuality;
   bool webpNearLossless;
   bool webpLossless;
+  bool webpSmartSubsample;
+  int webpEffort;
+  bool webpMinSize;
+  bool webpMixed;
+  int gifBitdepth;
+  int gifEffort;
+  double gifDither;
+  double gifInterFrameMaxError;
+  double gifInterPaletteMaxError;
+  bool gifReoptimise;
   int tiffQuality;
   VipsForeignTiffCompression tiffCompression;
   VipsForeignTiffPredictor tiffPredictor;
-  bool tiffSquash;
+  bool tiffPyramid;
+  int tiffBitdepth;
+  bool tiffTile;
+  int tiffTileHeight;
+  int tiffTileWidth;
   double tiffXres;
   double tiffYres;
+  VipsForeignTiffResunit tiffResolutionUnit;
+  int heifQuality;
+  VipsForeignHeifCompression heifCompression;
+  int heifEffort;
+  std::string heifChromaSubsampling;
+  bool heifLossless;
+  double jxlDistance;
+  int jxlDecodingTier;
+  int jxlEffort;
+  bool jxlLossless;
+  VipsBandFormat rawDepth;
   std::string err;
   bool withMetadata;
   int withMetadataOrientation;
+  double withMetadataDensity;
+  std::string withMetadataIcc;
+  std::unordered_map<std::string, std::string> withMetadataStrs;
+  int timeoutSeconds;
   std::unique_ptr<double[]> convKernel;
   int convKernelWidth;
   int convKernelHeight;
@@ -132,31 +204,34 @@ struct PipelineBaton {
   VipsOperationBoolean bandBoolOp;
   int extractChannel;
   bool removeAlpha;
+  double ensureAlpha;
+  VipsInterpretation colourspaceInput;
   VipsInterpretation colourspace;
+  std::vector<int> delay;
+  int loop;
   int tileSize;
   int tileOverlap;
   VipsForeignDzContainer tileContainer;
   VipsForeignDzLayout tileLayout;
   std::string tileFormat;
   int tileAngle;
+  std::vector<double> tileBackground;
+  int tileSkipBlanks;
   VipsForeignDzDepth tileDepth;
+  std::string tileId;
+  std::string tileBasename;
+  std::unique_ptr<double[]> recombMatrix;
 
   PipelineBaton():
     input(nullptr),
-    limitInputPixels(0),
     bufferOutLength(0),
-    overlay(nullptr),
-    overlayGravity(0),
-    overlayXOffset(-1),
-    overlayYOffset(-1),
-    overlayTile(false),
-    overlayCutout(false),
     topOffsetPre(-1),
     topOffsetPost(-1),
     channels(0),
-    canvas(Canvas::CROP),
+    kernel(VIPS_KERNEL_LANCZOS3),
-    crop(0),
+    canvas(sharp::Canvas::CROP),
-    embed(0),
+    position(0),
+    resizeBackground{ 0.0, 0.0, 0.0, 255.0 },
     hasCropOffset(false),
     cropOffsetLeft(0),
     cropOffsetTop(0),
@@ -164,29 +239,55 @@ struct PipelineBaton {
     tintA(128.0),
     tintB(128.0),
     flatten(false),
+    flattenBackground{ 0.0, 0.0, 0.0 },
     negate(false),
+    negateAlpha(true),
     blurSigma(0.0),
+    brightness(1.0),
+    saturation(1.0),
+    hue(0),
+    lightness(0),
     medianSize(0),
     sharpenSigma(0.0),
-    sharpenFlat(1.0),
+    sharpenM1(1.0),
-    sharpenJagged(2.0),
+    sharpenM2(2.0),
+    sharpenX1(2.0),
+    sharpenY2(10.0),
+    sharpenY3(20.0),
     threshold(0),
     thresholdGrayscale(true),
-    trimTolerance(0),
+    trimBackground{},
-    linearA(1.0),
+    trimThreshold(0.0),
-    linearB(0.0),
+    trimOffsetLeft(0),
+    trimOffsetTop(0),
+    linearA{},
+    linearB{},
     gamma(0.0),
     greyscale(false),
     normalise(false),
+    claheWidth(0),
+    claheHeight(0),
+    claheMaxSlope(3),
     useExifOrientation(false),
     angle(0),
+    rotationAngle(0.0),
+    rotationBackground{ 0.0, 0.0, 0.0, 255.0 },
     flip(false),
     flop(false),
     extendTop(0),
     extendBottom(0),
     extendLeft(0),
     extendRight(0),
+    extendBackground{ 0.0, 0.0, 0.0, 255.0 },
     withoutEnlargement(false),
+    withoutReduction(false),
+    affineMatrix{ 1.0, 0.0, 0.0, 1.0 },
+    affineBackground{ 0.0, 0.0, 0.0, 255.0 },
+    affineIdx(0),
+    affineIdy(0),
+    affineOdx(0),
+    affineOdy(0),
+    affineInterpolator("bicubic"),
     jpegQuality(80),
     jpegProgressive(false),
     jpegChromaSubsampling("4:2:0"),
@@ -196,17 +297,57 @@ struct PipelineBaton {
     jpegOptimiseScans(false),
     jpegOptimiseCoding(true),
     pngProgressive(false),
-    pngCompressionLevel(9),
+    pngCompressionLevel(6),
     pngAdaptiveFiltering(false),
+    pngPalette(false),
+    pngQuality(100),
+    pngEffort(7),
+    pngBitdepth(8),
+    pngDither(1.0),
+    jp2Quality(80),
+    jp2Lossless(false),
+    jp2TileHeight(512),
+    jp2TileWidth(512),
+    jp2ChromaSubsampling("4:4:4"),
     webpQuality(80),
+    webpAlphaQuality(100),
+    webpNearLossless(false),
+    webpLossless(false),
+    webpSmartSubsample(false),
+    webpEffort(4),
+    webpMinSize(false),
+    webpMixed(false),
+    gifBitdepth(8),
+    gifEffort(7),
+    gifDither(1.0),
+    gifInterFrameMaxError(0.0),
+    gifInterPaletteMaxError(3.0),
+    gifReoptimise(false),
     tiffQuality(80),
     tiffCompression(VIPS_FOREIGN_TIFF_COMPRESSION_JPEG),
     tiffPredictor(VIPS_FOREIGN_TIFF_PREDICTOR_HORIZONTAL),
-    tiffSquash(false),
+    tiffPyramid(false),
+    tiffBitdepth(8),
+    tiffTile(false),
+    tiffTileHeight(256),
+    tiffTileWidth(256),
     tiffXres(1.0),
     tiffYres(1.0),
+    tiffResolutionUnit(VIPS_FOREIGN_TIFF_RESUNIT_INCH),
+    heifQuality(50),
+    heifCompression(VIPS_FOREIGN_HEIF_COMPRESSION_AV1),
+    heifEffort(4),
+    heifChromaSubsampling("4:4:4"),
+    heifLossless(false),
+    jxlDistance(1.0),
+    jxlDecodingTier(0),
+    jxlEffort(7),
+    jxlLossless(false),
+    rawDepth(VIPS_FORMAT_UCHAR),
     withMetadata(false),
     withMetadataOrientation(-1),
+    withMetadataDensity(0.0),
+    timeoutSeconds(0),
     convKernelWidth(0),
     convKernelHeight(0),
     convKernelScale(0.0),
@@ -216,18 +357,18 @@ struct PipelineBaton {
     bandBoolOp(VIPS_OPERATION_BOOLEAN_LAST),
     extractChannel(-1),
     removeAlpha(false),
+    ensureAlpha(-1.0),
+    colourspaceInput(VIPS_INTERPRETATION_LAST),
     colourspace(VIPS_INTERPRETATION_LAST),
+    loop(-1),
     tileSize(256),
     tileOverlap(0),
     tileContainer(VIPS_FOREIGN_DZ_CONTAINER_FS),
     tileLayout(VIPS_FOREIGN_DZ_LAYOUT_DZ),
     tileAngle(0),
-    tileDepth(VIPS_FOREIGN_DZ_DEPTH_LAST){
+    tileBackground{ 255.0, 255.0, 255.0, 255.0 },
-      background[0] = 0.0;
+    tileSkipBlanks(-1),
-      background[1] = 0.0;
+    tileDepth(VIPS_FOREIGN_DZ_DEPTH_LAST) {}
-      background[2] = 0.0;
-      background[3] = 255.0;
-    }
 };
 
 #endif  // SRC_PIPELINE_H_

src/sharp.cc

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,8 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include <node.h>
+#include <napi.h>
-#include <nan.h>
 #include <vips/vips8>
 
 #include "common.h"
@@ -22,33 +21,31 @@
 #include "utilities.h"
 #include "stats.h"
 
-NAN_MODULE_INIT(init) {
+static void* sharp_vips_init(void*) {
   vips_init("sharp");
+  return nullptr;
+}
+
+Napi::Object init(Napi::Env env, Napi::Object exports) {
+  static GOnce sharp_vips_init_once = G_ONCE_INIT;
+  g_once(&sharp_vips_init_once, static_cast<GThreadFunc>(sharp_vips_init), nullptr);
 
   g_log_set_handler("VIPS", static_cast<GLogLevelFlags>(G_LOG_LEVEL_WARNING),
     static_cast<GLogFunc>(sharp::VipsWarningCallback), nullptr);
 
   // Methods available to JavaScript
-  Nan::Set(target, Nan::New("metadata").ToLocalChecked(),
+  exports.Set("metadata", Napi::Function::New(env, metadata));
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(metadata)).ToLocalChecked());
+  exports.Set("pipeline", Napi::Function::New(env, pipeline));
-  Nan::Set(target, Nan::New("pipeline").ToLocalChecked(),
+  exports.Set("cache", Napi::Function::New(env, cache));
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(pipeline)).ToLocalChecked());
+  exports.Set("concurrency", Napi::Function::New(env, concurrency));
-  Nan::Set(target, Nan::New("cache").ToLocalChecked(),
+  exports.Set("counters", Napi::Function::New(env, counters));
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(cache)).ToLocalChecked());
+  exports.Set("simd", Napi::Function::New(env, simd));
-  Nan::Set(target, Nan::New("concurrency").ToLocalChecked(),
+  exports.Set("libvipsVersion", Napi::Function::New(env, libvipsVersion));
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(concurrency)).ToLocalChecked());
+  exports.Set("format", Napi::Function::New(env, format));
-  Nan::Set(target, Nan::New("counters").ToLocalChecked(),
+  exports.Set("_maxColourDistance", Napi::Function::New(env, _maxColourDistance));
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(counters)).ToLocalChecked());
+  exports.Set("_isUsingJemalloc", Napi::Function::New(env, _isUsingJemalloc));
-  Nan::Set(target, Nan::New("simd").ToLocalChecked(),
+  exports.Set("stats", Napi::Function::New(env, stats));
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(simd)).ToLocalChecked());
+  return exports;
-  Nan::Set(target, Nan::New("libvipsVersion").ToLocalChecked(),
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(libvipsVersion)).ToLocalChecked());
-  Nan::Set(target, Nan::New("format").ToLocalChecked(),
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(format)).ToLocalChecked());
-  Nan::Set(target, Nan::New("_maxColourDistance").ToLocalChecked(),
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(_maxColourDistance)).ToLocalChecked());
-  Nan::Set(target, Nan::New("stats").ToLocalChecked(),
-    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(stats)).ToLocalChecked());
 }
 
-NODE_MODULE(sharp, init)
+NODE_API_MODULE(sharp, init)

src/stats.cc

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,28 +16,16 @@
 #include <vector>
 #include <iostream>
 
-#include <node.h>
+#include <napi.h>
-#include <nan.h>
 #include <vips/vips8>
 
 #include "common.h"
 #include "stats.h"
 
-class StatsWorker : public Nan::AsyncWorker {
+class StatsWorker : public Napi::AsyncWorker {
  public:
-  StatsWorker(
+  StatsWorker(Napi::Function callback, StatsBaton *baton, Napi::Function debuglog) :
-    Nan::Callback *callback, StatsBaton *baton, Nan::Callback *debuglog,
+    Napi::AsyncWorker(callback), baton(baton), debuglog(Napi::Persistent(debuglog)) {}
-    std::vector<v8::Local<v8::Object>> const buffersToPersist) :
-    Nan::AsyncWorker(callback, "sharp:StatsWorker"),
-    baton(baton), debuglog(debuglog),
-    buffersToPersist(buffersToPersist) {
-    // Protect Buffer objects from GC, keyed on index
-    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
-      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
-        SaveToPersistent(index, buffer);
-        return index + 1;
-      });
-  }
   ~StatsWorker() {}
 
   const int STAT_MIN_INDEX = 0;
@@ -54,15 +42,11 @@ class StatsWorker : public Nan::AsyncWorker {
   void Execute() {
     // Decrement queued task counter
     g_atomic_int_dec_and_test(&sharp::counterQueue);
-    using Nan::New;
-    using Nan::Set;
-    using sharp::MaximumImageAlpha;
 
     vips::VImage image;
     sharp::ImageType imageType = sharp::ImageType::UNKNOWN;
-
     try {
-      std::tie(image, imageType) = OpenInput(baton->input, baton->accessMethod);
+      std::tie(image, imageType) = OpenInput(baton->input);
     } catch (vips::VError const &err) {
       (baton->err).append(err.what());
     }
@@ -71,25 +55,51 @@ class StatsWorker : public Nan::AsyncWorker {
         vips::VImage stats = image.stats();
         int const bands = image.bands();
         for (int b = 1; b <= bands; b++) {
-          ChannelStats cStats(static_cast<int>(stats.getpoint(STAT_MIN_INDEX, b).front()),
+          ChannelStats cStats(
-                              static_cast<int>(stats.getpoint(STAT_MAX_INDEX, b).front()),
+            static_cast<int>(stats.getpoint(STAT_MIN_INDEX, b).front()),
-                              stats.getpoint(STAT_SUM_INDEX, b).front(), stats.getpoint(STAT_SQ_SUM_INDEX, b).front(),
+            static_cast<int>(stats.getpoint(STAT_MAX_INDEX, b).front()),
-                              stats.getpoint(STAT_MEAN_INDEX, b).front(), stats.getpoint(STAT_STDEV_INDEX, b).front(),
+            stats.getpoint(STAT_SUM_INDEX, b).front(),
-                              static_cast<int>(stats.getpoint(STAT_MINX_INDEX, b).front()),
+            stats.getpoint(STAT_SQ_SUM_INDEX, b).front(),
-                              static_cast<int>(stats.getpoint(STAT_MINY_INDEX, b).front()),
+            stats.getpoint(STAT_MEAN_INDEX, b).front(),
-                              static_cast<int>(stats.getpoint(STAT_MAXX_INDEX, b).front()),
+            stats.getpoint(STAT_STDEV_INDEX, b).front(),
-                              static_cast<int>(stats.getpoint(STAT_MAXY_INDEX, b).front()));
+            static_cast<int>(stats.getpoint(STAT_MINX_INDEX, b).front()),
+            static_cast<int>(stats.getpoint(STAT_MINY_INDEX, b).front()),
+            static_cast<int>(stats.getpoint(STAT_MAXX_INDEX, b).front()),
+            static_cast<int>(stats.getpoint(STAT_MAXY_INDEX, b).front()));
           baton->channelStats.push_back(cStats);
         }
         // Image is not opaque when alpha layer is present and contains a non-mamixa value
         if (sharp::HasAlpha(image)) {
           double const minAlpha = static_cast<double>(stats.getpoint(STAT_MIN_INDEX, bands).front());
-          if (minAlpha != MaximumImageAlpha(image.interpretation())) {
+          if (minAlpha != sharp::MaximumImageAlpha(image.interpretation())) {
             baton->isOpaque = false;
           }
         }
+        // Convert to greyscale
+        vips::VImage greyscale = image.colourspace(VIPS_INTERPRETATION_B_W)[0];
         // Estimate entropy via histogram of greyscale value frequency
-        baton->entropy = std::abs(image.colourspace(VIPS_INTERPRETATION_B_W)[0].hist_find().hist_entropy());
+        baton->entropy = std::abs(greyscale.hist_find().hist_entropy());
+        // Estimate sharpness via standard deviation of greyscale laplacian
+        if (image.width() > 1 || image.height() > 1) {
+          VImage laplacian = VImage::new_matrixv(3, 3,
+            0.0,  1.0, 0.0,
+            1.0, -4.0, 1.0,
+            0.0,  1.0, 0.0);
+          laplacian.set("scale", 9.0);
+          baton->sharpness = greyscale.conv(laplacian).deviate();
+        }
+        // Most dominant sRGB colour via 4096-bin 3D histogram
+        vips::VImage hist = sharp::RemoveAlpha(image)
+          .colourspace(VIPS_INTERPRETATION_sRGB)
+          .hist_find_ndim(VImage::option()->set("bins", 16));
+        std::complex<double> maxpos = hist.maxpos();
+        int const dx = static_cast<int>(std::real(maxpos));
+        int const dy = static_cast<int>(std::imag(maxpos));
+        std::vector<double> pel = hist(dx, dy);
+        int const dz = std::distance(pel.begin(), std::find(pel.begin(), pel.end(), hist.max()));
+        baton->dominantRed = dx * 16 + 8;
+        baton->dominantGreen = dy * 16 + 8;
+        baton->dominantBlue = dz * 16 + 8;
       } catch (vips::VError const &err) {
         (baton->err).append(err.what());
       }
@@ -100,93 +110,85 @@ class StatsWorker : public Nan::AsyncWorker {
     vips_thread_shutdown();
   }
 
-  void HandleOKCallback() {
+  void OnOK() {
-    using Nan::New;
+    Napi::Env env = Env();
-    using Nan::Set;
+    Napi::HandleScope scope(env);
-    Nan::HandleScope();
-
-    v8::Local<v8::Value> argv[2] = { Nan::Null(), Nan::Null() };
-    if (!baton->err.empty()) {
-      argv[0] = Nan::Error(baton->err.data());
-    } else {
-      // Stats Object
-      v8::Local<v8::Object> info = New<v8::Object>();
-      v8::Local<v8::Array> channels = New<v8::Array>();
-
-      std::vector<ChannelStats>::iterator it;
-      int i = 0;
-      for (it=baton->channelStats.begin() ; it < baton->channelStats.end(); it++, i++) {
-        v8::Local<v8::Object> channelStat = New<v8::Object>();
-        Set(channelStat, New("min").ToLocalChecked(), New<v8::Number>(it->min));
-        Set(channelStat, New("max").ToLocalChecked(), New<v8::Number>(it->max));
-        Set(channelStat, New("sum").ToLocalChecked(), New<v8::Number>(it->sum));
-        Set(channelStat, New("squaresSum").ToLocalChecked(), New<v8::Number>(it->squaresSum));
-        Set(channelStat, New("mean").ToLocalChecked(), New<v8::Number>(it->mean));
-        Set(channelStat, New("stdev").ToLocalChecked(), New<v8::Number>(it->stdev));
-        Set(channelStat, New("minX").ToLocalChecked(), New<v8::Number>(it->minX));
-        Set(channelStat, New("minY").ToLocalChecked(), New<v8::Number>(it->minY));
-        Set(channelStat, New("maxX").ToLocalChecked(), New<v8::Number>(it->maxX));
-        Set(channelStat, New("maxY").ToLocalChecked(), New<v8::Number>(it->maxY));
-        channels->Set(i, channelStat);
-      }
-
-      Set(info, New("channels").ToLocalChecked(), channels);
-      Set(info, New("isOpaque").ToLocalChecked(), New<v8::Boolean>(baton->isOpaque));
-      Set(info, New("entropy").ToLocalChecked(), New<v8::Number>(baton->entropy));
-      argv[1] = info;
-    }
-
-    // Dispose of Persistent wrapper around input Buffers so they can be garbage collected
-    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
-      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
-        GetFromPersistent(index);
-        return index + 1;
-      });
-    delete baton->input;
-    delete baton;
 
     // Handle warnings
     std::string warning = sharp::VipsWarningPop();
     while (!warning.empty()) {
-      v8::Local<v8::Value> message[1] = { New(warning).ToLocalChecked() };
+      debuglog.Call({ Napi::String::New(env, warning) });
-      debuglog->Call(1, message, async_resource);
       warning = sharp::VipsWarningPop();
     }
 
-    // Return to JavaScript
+    if (baton->err.empty()) {
-    callback->Call(2, argv, async_resource);
+      // Stats Object
+      Napi::Object info = Napi::Object::New(env);
+      Napi::Array channels = Napi::Array::New(env);
+
+      std::vector<ChannelStats>::iterator it;
+      int i = 0;
+      for (it = baton->channelStats.begin(); it < baton->channelStats.end(); it++, i++) {
+        Napi::Object channelStat = Napi::Object::New(env);
+        channelStat.Set("min", it->min);
+        channelStat.Set("max", it->max);
+        channelStat.Set("sum", it->sum);
+        channelStat.Set("squaresSum", it->squaresSum);
+        channelStat.Set("mean", it->mean);
+        channelStat.Set("stdev", it->stdev);
+        channelStat.Set("minX", it->minX);
+        channelStat.Set("minY", it->minY);
+        channelStat.Set("maxX", it->maxX);
+        channelStat.Set("maxY", it->maxY);
+        channels.Set(i, channelStat);
+      }
+
+      info.Set("channels", channels);
+      info.Set("isOpaque", baton->isOpaque);
+      info.Set("entropy", baton->entropy);
+      info.Set("sharpness", baton->sharpness);
+      Napi::Object dominant = Napi::Object::New(env);
+      dominant.Set("r", baton->dominantRed);
+      dominant.Set("g", baton->dominantGreen);
+      dominant.Set("b", baton->dominantBlue);
+      info.Set("dominant", dominant);
+      Callback().MakeCallback(Receiver().Value(), { env.Null(), info });
+    } else {
+      Callback().MakeCallback(Receiver().Value(), { Napi::Error::New(env, baton->err).Value() });
+    }
+
+    delete baton->input;
+    delete baton;
   }
 
  private:
   StatsBaton* baton;
-  Nan::Callback *debuglog;
+  Napi::FunctionReference debuglog;
-  std::vector<v8::Local<v8::Object>> buffersToPersist;
 };
 
 /*
   stats(options, callback)
 */
-NAN_METHOD(stats) {
+Napi::Value stats(const Napi::CallbackInfo& info) {
-  using sharp::AttrTo;
-
-  // Input Buffers must not undergo GC compaction during processing
-  std::vector<v8::Local<v8::Object>> buffersToPersist;
-
   // V8 objects are converted to non-V8 types held in the baton struct
   StatsBaton *baton = new StatsBaton;
-  v8::Local<v8::Object> options = info[0].As<v8::Object>();
+  Napi::Object options = info[0].As<Napi::Object>();
 
   // Input
-  baton->input = sharp::CreateInputDescriptor(sharp::AttrAs<v8::Object>(options, "input"), buffersToPersist);
+  baton->input = sharp::CreateInputDescriptor(options.Get("input").As<Napi::Object>());
-  baton->accessMethod = AttrTo<bool>(options, "sequentialRead") ? VIPS_ACCESS_SEQUENTIAL : VIPS_ACCESS_RANDOM;
+  baton->input->access = VIPS_ACCESS_RANDOM;
 
   // Function to notify of libvips warnings
-  Nan::Callback *debuglog = new Nan::Callback(sharp::AttrAs<v8::Function>(options, "debuglog"));
+  Napi::Function debuglog = options.Get("debuglog").As<Napi::Function>();
 
   // Join queue for worker thread
-  Nan::Callback *callback = new Nan::Callback(info[1].As<v8::Function>());
+  Napi::Function callback = info[1].As<Napi::Function>();
-  Nan::AsyncQueueWorker(new StatsWorker(callback, baton, debuglog, buffersToPersist));
+  StatsWorker *worker = new StatsWorker(callback, baton, debuglog);
+  worker->Receiver().Set("options", options);
+  worker->Queue();
 
   // Increment queued task counter
   g_atomic_int_inc(&sharp::counterQueue);
+
+  return info.Env().Undefined();
 }

src/stats.h

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,7 +16,7 @@
 #define SRC_STATS_H_
 
 #include <string>
-#include <nan.h>
+#include <napi.h>
 
 #include "./common.h"
 
@@ -33,12 +33,8 @@ struct ChannelStats {
   int maxX;
   int maxY;
 
-  ChannelStats():
+  ChannelStats(int minVal, int maxVal, double sumVal, double squaresSumVal,
-    min(0), max(0), sum(0), squaresSum(0), mean(0), stdev(0)
+    double meanVal, double stdevVal, int minXVal, int minYVal, int maxXVal, int maxYVal):
-    , minX(0), minY(0), maxX(0), maxY(0) {}
-
-    ChannelStats(int minVal, int maxVal, double sumVal, double squaresSumVal,
-                  double meanVal, double stdevVal, int minXVal, int minYVal, int maxXVal, int maxYVal):
     min(minVal), max(maxVal), sum(sumVal), squaresSum(squaresSumVal),
     mean(meanVal), stdev(stdevVal), minX(minXVal), minY(minYVal), maxX(maxXVal), maxY(maxYVal) {}
 };
@@ -46,22 +42,29 @@ struct ChannelStats {
 struct StatsBaton {
   // Input
   sharp::InputDescriptor *input;
-  VipsAccess accessMethod;
 
   // Output
   std::vector<ChannelStats> channelStats;
   bool isOpaque;
   double entropy;
+  double sharpness;
+  int dominantRed;
+  int dominantGreen;
+  int dominantBlue;
 
   std::string err;
 
   StatsBaton():
     input(nullptr),
     isOpaque(true),
-    entropy(0.0)
+    entropy(0.0),
+    sharpness(0.0),
+    dominantRed(0),
+    dominantGreen(0),
+    dominantBlue(0)
     {}
 };
 
-NAN_METHOD(stats);
+Napi::Value stats(const Napi::CallbackInfo& info);
 
 #endif  // SRC_STATS_H_

src/utilities.cc

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,8 +15,7 @@
 #include <cmath>
 #include <string>
 
-#include <node.h>
+#include <napi.h>
-#include <nan.h>
 #include <vips/vips8>
 #include <vips/vector.h>
 
@@ -24,182 +23,156 @@
 #include "operations.h"
 #include "utilities.h"
 
-using v8::Boolean;
-using v8::Integer;
-using v8::Local;
-using v8::Number;
-using v8::Object;
-using v8::String;
-
-using Nan::HandleScope;
-using Nan::New;
-using Nan::Set;
-using Nan::ThrowError;
-using Nan::To;
-using Nan::Utf8String;
-
 /*
   Get and set cache limits
 */
-NAN_METHOD(cache) {
+Napi::Value cache(const Napi::CallbackInfo& info) {
-  HandleScope();
+  Napi::Env env = info.Env();
 
   // Set memory limit
-  if (info[0]->IsInt32()) {
+  if (info[0].IsNumber()) {
-    vips_cache_set_max_mem(To<int32_t>(info[0]).FromJust() * 1048576);
+    vips_cache_set_max_mem(info[0].As<Napi::Number>().Int32Value() * 1048576);
   }
   // Set file limit
-  if (info[1]->IsInt32()) {
+  if (info[1].IsNumber()) {
-    vips_cache_set_max_files(To<int32_t>(info[1]).FromJust());
+    vips_cache_set_max_files(info[1].As<Napi::Number>().Int32Value());
   }
   // Set items limit
-  if (info[2]->IsInt32()) {
+  if (info[2].IsNumber()) {
-    vips_cache_set_max(To<int32_t>(info[2]).FromJust());
+    vips_cache_set_max(info[2].As<Napi::Number>().Int32Value());
   }
 
   // Get memory stats
-  Local<Object> memory = New<Object>();
+  Napi::Object memory = Napi::Object::New(env);
-  Set(memory, New("current").ToLocalChecked(),
+  memory.Set("current", round(vips_tracked_get_mem() / 1048576));
-    New<Integer>(static_cast<int>(round(vips_tracked_get_mem() / 1048576))));
+  memory.Set("high", round(vips_tracked_get_mem_highwater() / 1048576));
-  Set(memory, New("high").ToLocalChecked(),
+  memory.Set("max", round(vips_cache_get_max_mem() / 1048576));
-    New<Integer>(static_cast<int>(round(vips_tracked_get_mem_highwater() / 1048576))));
-  Set(memory, New("max").ToLocalChecked(),
-    New<Integer>(static_cast<int>(round(vips_cache_get_max_mem() / 1048576))));
   // Get file stats
-  Local<Object> files = New<Object>();
+  Napi::Object files = Napi::Object::New(env);
-  Set(files, New("current").ToLocalChecked(), New<Integer>(vips_tracked_get_files()));
+  files.Set("current", vips_tracked_get_files());
-  Set(files, New("max").ToLocalChecked(), New<Integer>(vips_cache_get_max_files()));
+  files.Set("max", vips_cache_get_max_files());
 
   // Get item stats
-  Local<Object> items = New<Object>();
+  Napi::Object items = Napi::Object::New(env);
-  Set(items, New("current").ToLocalChecked(), New<Integer>(vips_cache_get_size()));
+  items.Set("current", vips_cache_get_size());
-  Set(items, New("max").ToLocalChecked(), New<Integer>(vips_cache_get_max()));
+  items.Set("max", vips_cache_get_max());
 
-  Local<Object> cache = New<Object>();
+  Napi::Object cache = Napi::Object::New(env);
-  Set(cache, New("memory").ToLocalChecked(), memory);
+  cache.Set("memory", memory);
-  Set(cache, New("files").ToLocalChecked(), files);
+  cache.Set("files", files);
-  Set(cache, New("items").ToLocalChecked(), items);
+  cache.Set("items", items);
-  info.GetReturnValue().Set(cache);
+  return cache;
 }
 
 /*
   Get and set size of thread pool
 */
-NAN_METHOD(concurrency) {
+Napi::Value concurrency(const Napi::CallbackInfo& info) {
-  HandleScope();
-
   // Set concurrency
-  if (info[0]->IsInt32()) {
+  if (info[0].IsNumber()) {
-    vips_concurrency_set(To<int32_t>(info[0]).FromJust());
+    vips_concurrency_set(info[0].As<Napi::Number>().Int32Value());
   }
   // Get concurrency
-  info.GetReturnValue().Set(New<Integer>(vips_concurrency_get()));
+  return Napi::Number::New(info.Env(), vips_concurrency_get());
 }
 
 /*
   Get internal counters (queued tasks, processing tasks)
 */
-NAN_METHOD(counters) {
+Napi::Value counters(const Napi::CallbackInfo& info) {
-  using sharp::counterProcess;
+  Napi::Object counters = Napi::Object::New(info.Env());
-  using sharp::counterQueue;
+  counters.Set("queue", sharp::counterQueue);
-
+  counters.Set("process", sharp::counterProcess);
-  HandleScope();
+  return counters;
-  Local<Object> counters = New<Object>();
-  Set(counters, New("queue").ToLocalChecked(), New<Integer>(counterQueue));
-  Set(counters, New("process").ToLocalChecked(), New<Integer>(counterProcess));
-  info.GetReturnValue().Set(counters);
 }
 
 /*
   Get and set use of SIMD vector unit instructions
 */
-NAN_METHOD(simd) {
+Napi::Value simd(const Napi::CallbackInfo& info) {
-  HandleScope();
-
   // Set state
-  if (info[0]->IsBoolean()) {
+  if (info[0].IsBoolean()) {
-    vips_vector_set_enabled(To<bool>(info[0]).FromJust());
+    vips_vector_set_enabled(info[0].As<Napi::Boolean>().Value());
   }
   // Get state
-  info.GetReturnValue().Set(New<Boolean>(vips_vector_isenabled()));
+  return Napi::Boolean::New(info.Env(), vips_vector_isenabled());
 }
 
 /*
   Get libvips version
 */
-NAN_METHOD(libvipsVersion) {
+Napi::Value libvipsVersion(const Napi::CallbackInfo& info) {
-  HandleScope();
   char version[9];
   g_snprintf(version, sizeof(version), "%d.%d.%d", vips_version(0), vips_version(1), vips_version(2));
-  info.GetReturnValue().Set(New(version).ToLocalChecked());
+  return Napi::String::New(info.Env(), version);
 }
 
 /*
   Get available input/output file/buffer/stream formats
 */
-NAN_METHOD(format) {
+Napi::Value format(const Napi::CallbackInfo& info) {
-  HandleScope();
+  Napi::Env env = info.Env();
-
+  Napi::Object format = Napi::Object::New(env);
-  // Attribute names
+  for (std::string const f : {
-  Local<String> attrId = New("id").ToLocalChecked();
+    "jpeg", "png", "webp", "tiff", "magick", "openslide", "dz",
-  Local<String> attrInput = New("input").ToLocalChecked();
+    "ppm", "fits", "gif", "svg", "heif", "pdf", "vips", "jp2k", "jxl"
-  Local<String> attrOutput = New("output").ToLocalChecked();
-  Local<String> attrFile = New("file").ToLocalChecked();
-  Local<String> attrBuffer = New("buffer").ToLocalChecked();
-  Local<String> attrStream = New("stream").ToLocalChecked();
-
-  // Which load/save operations are available for each compressed format?
-  Local<Object> format = New<Object>();
-  for (std::string f : {
-    "jpeg", "png", "webp", "tiff", "magick", "openslide", "dz", "ppm", "fits", "gif", "svg", "pdf", "v"
   }) {
     // Input
-    Local<Boolean> hasInputFile =
+    const VipsObjectClass *oc = vips_class_find("VipsOperation", (f + "load").c_str());
-      New<Boolean>(vips_type_find("VipsOperation", (f + "load").c_str()));
+    Napi::Boolean hasInputFile = Napi::Boolean::New(env, oc);
-    Local<Boolean> hasInputBuffer =
+    Napi::Boolean hasInputBuffer =
-      New<Boolean>(vips_type_find("VipsOperation", (f + "load_buffer").c_str()));
+      Napi::Boolean::New(env, vips_type_find("VipsOperation", (f + "load_buffer").c_str()));
-    Local<Object> input = New<Object>();
+    Napi::Object input = Napi::Object::New(env);
-    Set(input, attrFile, hasInputFile);
+    input.Set("file", hasInputFile);
-    Set(input, attrBuffer, hasInputBuffer);
+    input.Set("buffer", hasInputBuffer);
-    Set(input, attrStream, hasInputBuffer);
+    input.Set("stream", hasInputBuffer);
+    if (hasInputFile) {
+      const VipsForeignClass *fc = VIPS_FOREIGN_CLASS(oc);
+      if (fc->suffs) {
+        Napi::Array fileSuffix = Napi::Array::New(env);
+        const char **suffix = fc->suffs;
+        for (int i = 0; *suffix; i++, suffix++) {
+          fileSuffix.Set(i, Napi::String::New(env, *suffix));
+        }
+        input.Set("fileSuffix", fileSuffix);
+      }
+    }
     // Output
-    Local<Boolean> hasOutputFile =
+    Napi::Boolean hasOutputFile =
-      New<Boolean>(vips_type_find("VipsOperation", (f + "save").c_str()));
+      Napi::Boolean::New(env, vips_type_find("VipsOperation", (f + "save").c_str()));
-    Local<Boolean> hasOutputBuffer =
+    Napi::Boolean hasOutputBuffer =
-      New<Boolean>(vips_type_find("VipsOperation", (f + "save_buffer").c_str()));
+      Napi::Boolean::New(env, vips_type_find("VipsOperation", (f + "save_buffer").c_str()));
-    Local<Object> output = New<Object>();
+    Napi::Object output = Napi::Object::New(env);
-    Set(output, attrFile, hasOutputFile);
+    output.Set("file", hasOutputFile);
-    Set(output, attrBuffer, hasOutputBuffer);
+    output.Set("buffer", hasOutputBuffer);
-    Set(output, attrStream, hasOutputBuffer);
+    output.Set("stream", hasOutputBuffer);
     // Other attributes
-    Local<Object> container = New<Object>();
+    Napi::Object container = Napi::Object::New(env);
-    Local<String> formatId = New(f).ToLocalChecked();
+    container.Set("id", f);
-    Set(container, attrId, formatId);
+    container.Set("input", input);
-    Set(container, attrInput, input);
+    container.Set("output", output);
-    Set(container, attrOutput, output);
     // Add to set of formats
-    Set(format, formatId, container);
+    format.Set(f, container);
   }
 
   // Raw, uncompressed data
-  Local<Object> raw = New<Object>();
+  Napi::Boolean supported = Napi::Boolean::New(env, true);
-  Local<String> rawId = New("raw").ToLocalChecked();
+  Napi::Boolean unsupported = Napi::Boolean::New(env, false);
-  Set(raw, attrId, rawId);
+  Napi::Object rawInput = Napi::Object::New(env);
-  Set(format, rawId, raw);
+  rawInput.Set("file", unsupported);
-  Local<Boolean> supported = New<Boolean>(true);
+  rawInput.Set("buffer", supported);
-  Local<Boolean> unsupported = New<Boolean>(false);
+  rawInput.Set("stream", supported);
-  Local<Object> rawInput = New<Object>();
+  Napi::Object rawOutput = Napi::Object::New(env);
-  Set(rawInput, attrFile, unsupported);
+  rawOutput.Set("file", unsupported);
-  Set(rawInput, attrBuffer, supported);
+  rawOutput.Set("buffer", supported);
-  Set(rawInput, attrStream, supported);
+  rawOutput.Set("stream", supported);
-  Set(raw, attrInput, rawInput);
+  Napi::Object raw = Napi::Object::New(env);
-  Local<Object> rawOutput = New<Object>();
+  raw.Set("id", "raw");
-  Set(rawOutput, attrFile, unsupported);
+  raw.Set("input", rawInput);
-  Set(rawOutput, attrBuffer, supported);
+  raw.Set("output", rawOutput);
-  Set(rawOutput, attrStream, supported);
+  format.Set("raw", raw);
-  Set(raw, attrOutput, rawOutput);
 
-  info.GetReturnValue().Set(format);
+  return format;
 }
 
 /*
@@ -207,65 +180,75 @@ NAN_METHOD(format) {
   Calculates the maximum colour distance using the DE2000 algorithm
   between two images of the same dimensions and number of channels.
 */
-NAN_METHOD(_maxColourDistance) {
+Napi::Value _maxColourDistance(const Napi::CallbackInfo& info) {
-  using vips::VImage;
+  Napi::Env env = info.Env();
-  using vips::VError;
-  using sharp::DetermineImageType;
-  using sharp::ImageType;
-  using sharp::HasAlpha;
-
-  HandleScope();
 
   // Open input files
   VImage image1;
-  ImageType imageType1 = DetermineImageType(*Utf8String(info[0]));
+  sharp::ImageType imageType1 = sharp::DetermineImageType(info[0].As<Napi::String>().Utf8Value().data());
-  if (imageType1 != ImageType::UNKNOWN) {
+  if (imageType1 != sharp::ImageType::UNKNOWN) {
     try {
-      image1 = VImage::new_from_file(*Utf8String(info[0]));
+      image1 = VImage::new_from_file(info[0].As<Napi::String>().Utf8Value().c_str());
     } catch (...) {
-      return ThrowError("Input file 1 has corrupt header");
+      throw Napi::Error::New(env, "Input file 1 has corrupt header");
     }
   } else {
-    return ThrowError("Input file 1 is of an unsupported image format");
+    throw Napi::Error::New(env, "Input file 1 is of an unsupported image format");
   }
   VImage image2;
-  ImageType imageType2 = DetermineImageType(*Utf8String(info[1]));
+  sharp::ImageType imageType2 = sharp::DetermineImageType(info[1].As<Napi::String>().Utf8Value().data());
-  if (imageType2 != ImageType::UNKNOWN) {
+  if (imageType2 != sharp::ImageType::UNKNOWN) {
     try {
-      image2 = VImage::new_from_file(*Utf8String(info[1]));
+      image2 = VImage::new_from_file(info[1].As<Napi::String>().Utf8Value().c_str());
     } catch (...) {
-      return ThrowError("Input file 2 has corrupt header");
+      throw Napi::Error::New(env, "Input file 2 has corrupt header");
     }
   } else {
-    return ThrowError("Input file 2 is of an unsupported image format");
+    throw Napi::Error::New(env, "Input file 2 is of an unsupported image format");
   }
   // Ensure same number of channels
   if (image1.bands() != image2.bands()) {
-    return ThrowError("mismatchedBands");
+    throw Napi::Error::New(env, "mismatchedBands");
   }
   // Ensure same dimensions
   if (image1.width() != image2.width() || image1.height() != image2.height()) {
-    return ThrowError("mismatchedDimensions");
+    throw Napi::Error::New(env, "mismatchedDimensions");
   }
 
   double maxColourDistance;
   try {
     // Premultiply and remove alpha
-    if (HasAlpha(image1)) {
+    if (sharp::HasAlpha(image1)) {
       image1 = image1.premultiply().extract_band(1, VImage::option()->set("n", image1.bands() - 1));
     }
-    if (HasAlpha(image2)) {
+    if (sharp::HasAlpha(image2)) {
       image2 = image2.premultiply().extract_band(1, VImage::option()->set("n", image2.bands() - 1));
     }
     // Calculate colour distance
     maxColourDistance = image1.dE00(image2).max();
-  } catch (VError err) {
+  } catch (vips::VError const &err) {
-    return ThrowError(err.what());
+    throw Napi::Error::New(env, err.what());
   }
 
   // Clean up libvips' per-request data and threads
   vips_error_clear();
   vips_thread_shutdown();
 
-  info.GetReturnValue().Set(New<Number>(maxColourDistance));
+  return Napi::Number::New(env, maxColourDistance);
 }
+
+#if defined(__GNUC__)
+// mallctl will be resolved by the runtime linker when jemalloc is being used
+extern "C" {
+  int mallctl(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen) __attribute__((weak));
+}
+Napi::Value _isUsingJemalloc(const Napi::CallbackInfo& info) {
+  Napi::Env env = info.Env();
+  return Napi::Boolean::New(env, mallctl != nullptr);
+}
+#else
+Napi::Value _isUsingJemalloc(const Napi::CallbackInfo& info) {
+  Napi::Env env = info.Env();
+  return Napi::Boolean::New(env, false);
+}
+#endif

src/utilities.h

@@ -1,4 +1,4 @@
-// Copyright 2013, 2014, 2015, 2016, 2017 Lovell Fuller and contributors.
+// Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,14 +15,15 @@
 #ifndef SRC_UTILITIES_H_
 #define SRC_UTILITIES_H_
 
-#include <nan.h>
+#include <napi.h>
 
-NAN_METHOD(cache);
+Napi::Value cache(const Napi::CallbackInfo& info);
-NAN_METHOD(concurrency);
+Napi::Value concurrency(const Napi::CallbackInfo& info);
-NAN_METHOD(counters);
+Napi::Value counters(const Napi::CallbackInfo& info);
-NAN_METHOD(simd);
+Napi::Value simd(const Napi::CallbackInfo& info);
-NAN_METHOD(libvipsVersion);
+Napi::Value libvipsVersion(const Napi::CallbackInfo& info);
-NAN_METHOD(format);
+Napi::Value format(const Napi::CallbackInfo& info);
-NAN_METHOD(_maxColourDistance);
+Napi::Value _maxColourDistance(const Napi::CallbackInfo& info);
+Napi::Value _isUsingJemalloc(const Napi::CallbackInfo& info);
 
 #endif  // SRC_UTILITIES_H_

test/beforeEach.js

@@ -0,0 +1,21 @@
+'use strict';
+
+const sharp = require('../');
+
+const usingCache = !process.env.G_DEBUG;
+const usingSimd = !process.env.VIPS_NOVECTOR;
+const concurrency = Number(process.env.VIPS_CONCURRENCY) || 0;
+
+exports.mochaHooks = {
+  beforeEach () {
+    sharp.cache(usingCache);
+    sharp.simd(usingSimd);
+    sharp.concurrency(concurrency);
+  },
+
+  afterEach () {
+    if (global.gc) {
+      global.gc();
+    }
+  }
+};

test/bench/Dockerfile

@@ -0,0 +1,26 @@
+FROM ubuntu:22.04
+ARG BRANCH=main
+
+# Install basic dependencies
+RUN apt-get -y update && apt-get install -y build-essential curl git
+
+# Install latest Node.js LTS
+RUN curl -fsSL https://deb.nodesource.com/setup_16.x | bash -
+RUN apt-get install -y nodejs
+
+# Install benchmark dependencies
+RUN apt-get install -y imagemagick libmagick++-dev graphicsmagick
+
+# Install sharp
+RUN mkdir /tmp/sharp
+RUN cd /tmp && git clone --single-branch --branch $BRANCH https://github.com/lovell/sharp.git
+RUN cd /tmp/sharp && npm install --build-from-source
+
+# Install benchmark test
+RUN cd /tmp/sharp/test/bench && npm install --omit optional
+
+RUN cat /etc/os-release | grep VERSION=
+RUN node -v
+
+WORKDIR /tmp/sharp/test/bench
+CMD [ "node", "perf" ]

test/bench/package.json

@@ -7,20 +7,22 @@
   "scripts": {
     "test": "node perf && node random && node parallel"
   },
-  "devDependencies": {
+  "dependencies": {
-    "async": "^2.6.0",
+    "@squoosh/cli": "0.7.2",
-    "benchmark": "^2.1.4",
+    "@squoosh/lib": "0.4.0",
-    "gm": "^1.23.1",
+    "async": "3.2.4",
-    "imagemagick": "^0.1.3",
+    "benchmark": "2.1.4",
-    "imagemagick-native": "^1.9.3",
+    "gm": "1.25.0",
-    "images": "^3.0.1",
+    "imagemagick": "0.1.3",
-    "jimp": "^0.2.28",
+    "jimp": "0.16.2",
-    "mapnik": "^3.6.2",
+    "semver": "7.3.8"
-    "pajk-lwip": "^0.2.0",
+  },
-    "semver": "^5.4.1"
+  "optionalDependencies": {
+    "@tensorflow/tfjs-node": "4.1.0",
+    "mapnik": "4.5.9"
   },
   "license": "Apache-2.0",
   "engines": {
-    "node": ">=4"
+    "node": "16"
   }
 }

test/bench/perf.js

@@ -1,48 +1,46 @@
 'use strict';
 
+const os = require('os');
 const fs = require('fs');
+const { exec } = require('child_process');
 
 const async = require('async');
-const assert = require('assert');
 const Benchmark = require('benchmark');
 
+const safeRequire = (name) => {
+  try {
+    return require(name);
+  } catch (err) {}
+  return null;
+};
+
 // Contenders
 const sharp = require('../../');
 const gm = require('gm');
 const imagemagick = require('imagemagick');
-const mapnik = require('mapnik');
+const mapnik = safeRequire('mapnik');
 const jimp = require('jimp');
-let images;
+const squoosh = require('@squoosh/lib');
-try {
+process.env.TF_CPP_MIN_LOG_LEVEL = 1;
-  images = require('images');
+const tfjs = safeRequire('@tensorflow/tfjs-node');
-} catch (err) {
-  console.log('Excluding node-images');
-}
-let imagemagickNative;
-try {
-  imagemagickNative = require('imagemagick-native');
-} catch (err) {
-  console.log('Excluding imagemagick-native');
-}
-let lwip;
-try {
-  lwip = require('pajk-lwip');
-} catch (err) {
-  console.log('Excluding lwip');
-}
 
 const fixtures = require('../fixtures');
 
+const outputJpg = fixtures.path('output.jpg');
+const outputPng = fixtures.path('output.png');
+const outputWebP = fixtures.path('output.webp');
+
 const width = 720;
 const height = 588;
 
 // Disable libvips cache to ensure tests are as fair as they can be
 sharp.cache(false);
-// Enable use of SIMD
+
-sharp.simd(true);
+// Spawn one thread per CPU
+sharp.concurrency(os.cpus().length);
 
 async.series({
-  'jpeg': function (callback) {
+  jpeg: function (callback) {
     const inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
     const jpegSuite = new Benchmark.Suite('jpeg');
     // jimp
@@ -54,7 +52,7 @@ async.series({
             throw err;
           } else {
             image
-              .resize(width, height)
+              .resize(width, height, jimp.RESIZE_BICUBIC)
               .quality(80)
               .getBuffer(jimp.MIME_JPEG, function (err) {
                 if (err) {
@@ -74,9 +72,9 @@ async.series({
             throw err;
           } else {
             image
-              .resize(width, height)
+              .resize(width, height, jimp.RESIZE_BICUBIC)
               .quality(80)
-              .write(fixtures.outputJpg, function (err) {
+              .write(outputJpg, function (err) {
                 if (err) {
                   throw err;
                 } else {
@@ -87,53 +85,67 @@ async.series({
         });
       }
     });
-    // lwip
+    // squoosh-cli
-    if (typeof lwip !== 'undefined') {
+    jpegSuite.add('squoosh-cli-file-file', {
-      jpegSuite.add('lwip-file-file', {
+      defer: true,
-        defer: true,
+      fn: function (deferred) {
-        fn: function (deferred) {
+        exec(`./node_modules/.bin/squoosh-cli \
-          lwip.open(fixtures.inputJpg, function (err, image) {
+          --output-dir ${os.tmpdir()} \
-            if (err) {
+          --resize '{"enabled":true,"width":${width},"height":${height},"method":"lanczos3","premultiply":false,"linearRGB":false}' \
-              throw err;
+          --mozjpeg '{"quality":80,"progressive":false,"optimize_coding":true,"quant_table":0,"trellis_multipass":false,"chroma_subsample":2,"separate_chroma_quality":false}' \
-            }
+          "${fixtures.inputJpg}"`, function (err) {
-            image.resize(width, height, 'lanczos', function (err, image) {
+          if (err) {
-              if (err) {
+            throw err;
-                throw err;
+          }
+          deferred.resolve();
+        });
+      }
+    });
+    // squoosh-lib (GPLv3)
+    jpegSuite.add('squoosh-lib-buffer-buffer', {
+      defer: true,
+      fn: function (deferred) {
+        const pool = new squoosh.ImagePool();
+        const image = pool.ingestImage(inputJpgBuffer);
+        image.decoded
+          .then(function () {
+            return image.preprocess({
+              resize: {
+                enabled: true,
+                width,
+                height,
+                method: 'lanczos3',
+                premultiply: false,
+                linearRGB: false
               }
-              image.writeFile(fixtures.outputJpg, {quality: 80}, function (err) {
-                if (err) {
-                  throw err;
-                }
-                deferred.resolve();
-              });
             });
-          });
+          })
-        }
+          .then(function () {
-      }).add('lwip-buffer-buffer', {
+            return image.encode({
-        defer: true,
+              mozjpeg: {
-        fn: function (deferred) {
+                quality: 80,
-          lwip.open(inputJpgBuffer, 'jpg', function (err, image) {
+                progressive: false,
-            if (err) {
+                optimize_coding: true,
-              throw err;
+                quant_table: 0,
-            }
+                trellis_multipass: false,
-            image.resize(width, height, 'lanczos', function (err, image) {
+                chroma_subsample: 2,
-              if (err) {
+                separate_chroma_quality: false
-                throw err;
               }
-              image.toBuffer('jpg', {quality: 80}, function (err, buffer) {
-                if (err) {
-                  throw err;
-                }
-                assert.notStrictEqual(null, buffer);
-                deferred.resolve();
-              });
             });
+          })
+          .then(function () {
+            return pool.close();
+          })
+          .then(function () {
+            return image.encodedWith.mozjpeg;
+          })
+          .then(function () {
+            deferred.resolve();
           });
-        }
+      }
-      });
+    });
-    }
     // mapnik
-    jpegSuite.add('mapnik-file-file', {
+    mapnik && jpegSuite.add('mapnik-file-file', {
       defer: true,
       fn: function (deferred) {
         mapnik.Image.open(fixtures.inputJpg, function (err, img) {
@@ -142,7 +154,7 @@ async.series({
             .resize(width, height, {
               scaling_method: mapnik.imageScaling.lanczos
             })
-            .save(fixtures.outputJpg, 'jpeg:quality=80', function (err) {
+            .save(outputJpg, 'jpeg:quality=80', function (err) {
               if (err) throw err;
               deferred.resolve();
             });
@@ -170,7 +182,7 @@ async.series({
       fn: function (deferred) {
         imagemagick.resize({
           srcPath: fixtures.inputJpg,
-          dstPath: fixtures.outputJpg,
+          dstPath: outputJpg,
           quality: 0.8,
           width: width,
           height: height,
@@ -185,29 +197,6 @@ async.series({
         });
       }
     });
-    // imagemagick-native
-    if (typeof imagemagickNative !== 'undefined') {
-      jpegSuite.add('imagemagick-native-buffer-buffer', {
-        defer: true,
-        fn: function (deferred) {
-          imagemagickNative.convert({
-            srcData: inputJpgBuffer,
-            quality: 80,
-            width: width,
-            height: height,
-            format: 'JPEG',
-            filter: 'Lanczos'
-          }, function (err, buffer) {
-            if (err) {
-              throw err;
-            } else {
-              assert.notStrictEqual(null, buffer);
-              deferred.resolve();
-            }
-          });
-        }
-      });
-    }
     // gm
     jpegSuite.add('gm-buffer-file', {
       defer: true,
@@ -216,7 +205,7 @@ async.series({
           .filter('Lanczos')
           .resize(width, height)
           .quality(80)
-          .write(fixtures.outputJpg, function (err) {
+          .write(outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -231,11 +220,10 @@ async.series({
           .filter('Lanczos')
           .resize(width, height)
           .quality(80)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -247,7 +235,7 @@ async.series({
           .filter('Lanczos')
           .resize(width, height)
           .quality(80)
-          .write(fixtures.outputJpg, function (err) {
+          .write(outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -262,31 +250,40 @@ async.series({
           .filter('Lanczos')
           .resize(width, height)
           .quality(80)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
       }
     });
-    // images
+    // tfjs
-    if (typeof images !== 'undefined') {
+    tfjs && jpegSuite.add('tfjs-node-buffer-buffer', {
-      jpegSuite.add('images-file-file', function () {
+      defer: true,
-        images(fixtures.inputJpg)
+      fn: function (deferred) {
-          .resize(width, height)
+        const decoded = tfjs.node.decodeJpeg(inputJpgBuffer);
-          .save(fixtures.outputJpg, { quality: 80 });
+        const resized = tfjs.image.resizeBilinear(decoded, [height, width]);
-      });
+        tfjs
-    }
+          .node
+          .encodeJpeg(resized, 'rgb', 80)
+          .then(function () {
+            deferred.resolve();
+            tfjs.disposeVariables();
+          })
+          .catch(function (err) {
+            throw err;
+          });
+      }
+    });
     // sharp
     jpegSuite.add('sharp-buffer-file', {
       defer: true,
       fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputJpg, function (err) {
+          .toFile(outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -299,11 +296,10 @@ async.series({
       fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -313,7 +309,7 @@ async.series({
       fn: function (deferred) {
         sharp(fixtures.inputJpg)
           .resize(width, height)
-          .toFile(fixtures.outputJpg, function (err) {
+          .toFile(outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -325,7 +321,7 @@ async.series({
       defer: true,
       fn: function (deferred) {
         const readable = fs.createReadStream(fixtures.inputJpg);
-        const writable = fs.createWriteStream(fixtures.outputJpg);
+        const writable = fs.createWriteStream(outputJpg);
         writable.on('finish', function () {
           deferred.resolve();
         });
@@ -338,11 +334,10 @@ async.series({
       fn: function (deferred) {
         sharp(fixtures.inputJpg)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -353,9 +348,11 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .toBuffer()
-          .then(function (buffer) {
+          .then(function () {
-            assert.notStrictEqual(null, buffer);
             deferred.resolve();
+          })
+          .catch(function (err) {
+            throw err;
           });
       }
     }).on('cycle', function (event) {
@@ -374,11 +371,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .sharpen()
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -389,11 +385,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .sharpen(3, 1, 3)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -404,11 +399,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .blur()
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -419,11 +413,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .blur(3)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -434,11 +427,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .gamma()
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -449,11 +441,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .normalise()
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -464,11 +455,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .greyscale()
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -480,11 +470,10 @@ async.series({
           .resize(width, height)
           .gamma()
           .greyscale()
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -495,11 +484,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .jpeg({ progressive: true })
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -510,11 +498,10 @@ async.series({
         sharp(inputJpgBuffer)
           .resize(width, height)
           .jpeg({ chromaSubsampling: '4:4:4' })
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -525,11 +512,10 @@ async.series({
         sharp(inputJpgBuffer)
           .rotate(90)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -540,12 +526,11 @@ async.series({
         sharp.simd(false);
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             sharp.simd(true);
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -553,14 +538,12 @@ async.series({
     }).add('sharp-sequentialRead', {
       defer: true,
       fn: function (deferred) {
-        sharp(inputJpgBuffer)
+        sharp(inputJpgBuffer, { sequentialRead: true })
-          .sequentialRead()
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -569,13 +552,14 @@ async.series({
       defer: true,
       fn: function (deferred) {
         sharp(inputJpgBuffer)
-          .resize(width, height)
+          .resize(width, height, {
-          .crop(sharp.strategy.entropy)
+            fit: 'cover',
-          .toBuffer(function (err, buffer) {
+            position: sharp.strategy.entropy
+          })
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -584,13 +568,14 @@ async.series({
       defer: true,
       fn: function (deferred) {
         sharp(inputJpgBuffer)
-          .resize(width, height)
+          .resize(width, height, {
-          .crop(sharp.strategy.attention)
+            fit: 'cover',
-          .toBuffer(function (err, buffer) {
+            position: sharp.strategy.attention
+          })
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -609,11 +594,10 @@ async.series({
       fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height, { kernel: 'cubic' })
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -623,11 +607,10 @@ async.series({
       fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height, { kernel: 'lanczos2' })
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -637,11 +620,10 @@ async.series({
       fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height, { kernel: 'lanczos3' })
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -654,8 +636,9 @@ async.series({
   },
   // PNG
   png: function (callback) {
-    const inputPngBuffer = fs.readFileSync(fixtures.inputPng);
+    const inputPngBuffer = fs.readFileSync(fixtures.inputPngAlphaPremultiplicationLarge);
     const pngSuite = new Benchmark.Suite('png');
+    const minSamples = 64;
     // jimp
     pngSuite.add('jimp-buffer-buffer', {
       defer: true,
@@ -666,6 +649,8 @@ async.series({
           } else {
             image
               .resize(width, height)
+              .deflateLevel(6)
+              .filterType(0)
               .getBuffer(jimp.MIME_PNG, function (err) {
                 if (err) {
                   throw err;
@@ -679,13 +664,15 @@ async.series({
     }).add('jimp-file-file', {
       defer: true,
       fn: function (deferred) {
-        jimp.read(fixtures.inputPng, function (err, image) {
+        jimp.read(fixtures.inputPngAlphaPremultiplicationLarge, function (err, image) {
           if (err) {
             throw err;
           } else {
             image
               .resize(width, height)
-              .write(fixtures.outputPng, function (err) {
+              .deflateLevel(6)
+              .filterType(0)
+              .write(outputPng, function (err) {
                 if (err) {
                   throw err;
                 } else {
@@ -696,36 +683,11 @@ async.series({
         });
       }
     });
-    // lwip
-    if (typeof lwip !== 'undefined') {
-      pngSuite.add('lwip-buffer-buffer', {
-        defer: true,
-        fn: function (deferred) {
-          lwip.open(inputPngBuffer, 'png', function (err, image) {
-            if (err) {
-              throw err;
-            }
-            image.resize(width, height, 'lanczos', function (err, image) {
-              if (err) {
-                throw err;
-              }
-              image.toBuffer('png', function (err, buffer) {
-                if (err) {
-                  throw err;
-                }
-                assert.notStrictEqual(null, buffer);
-                deferred.resolve();
-              });
-            });
-          });
-        }
-      });
-    }
     // mapnik
-    pngSuite.add('mapnik-file-file', {
+    mapnik && pngSuite.add('mapnik-file-file', {
       defer: true,
       fn: function (deferred) {
-        mapnik.Image.open(fixtures.inputPng, function (err, img) {
+        mapnik.Image.open(fixtures.inputPngAlphaPremultiplicationLarge, function (err, img) {
           if (err) throw err;
           img.premultiply(function (err, img) {
             if (err) throw err;
@@ -735,7 +697,7 @@ async.series({
               if (err) throw err;
               img.demultiply(function (err, img) {
                 if (err) throw err;
-                img.save(fixtures.outputPng, 'png', function (err) {
+                img.save(outputPng, 'png', function (err) {
                   if (err) throw err;
                   deferred.resolve();
                 });
@@ -772,11 +734,15 @@ async.series({
       defer: true,
       fn: function (deferred) {
         imagemagick.resize({
-          srcPath: fixtures.inputPng,
+          srcPath: fixtures.inputPngAlphaPremultiplicationLarge,
-          dstPath: fixtures.outputPng,
+          dstPath: outputPng,
           width: width,
           height: height,
-          filter: 'Lanczos'
+          filter: 'Lanczos',
+          customArgs: [
+            '-define', 'PNG:compression-level=6',
+            '-define', 'PNG:compression-filter=0'
+          ]
         }, function (err) {
           if (err) {
             throw err;
@@ -786,30 +752,16 @@ async.series({
         });
       }
     });
-    // imagemagick-native
-    if (typeof imagemagickNative !== 'undefined') {
-      pngSuite.add('imagemagick-native-buffer-buffer', {
-        defer: true,
-        fn: function (deferred) {
-          imagemagickNative.convert({
-            srcData: inputPngBuffer,
-            width: width,
-            height: height,
-            format: 'PNG',
-            filter: 'Lanczos'
-          });
-          deferred.resolve();
-        }
-      });
-    }
     // gm
     pngSuite.add('gm-file-file', {
       defer: true,
       fn: function (deferred) {
-        gm(fixtures.inputPng)
+        gm(fixtures.inputPngAlphaPremultiplicationLarge)
           .filter('Lanczos')
           .resize(width, height)
-          .write(fixtures.outputPng, function (err) {
+          .define('PNG:compression-level=6')
+          .define('PNG:compression-filter=0')
+          .write(outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -820,34 +772,29 @@ async.series({
     }).add('gm-file-buffer', {
       defer: true,
       fn: function (deferred) {
-        gm(fixtures.inputPng)
+        gm(fixtures.inputPngAlphaPremultiplicationLarge)
           .filter('Lanczos')
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .define('PNG:compression-level=6')
+          .define('PNG:compression-filter=0')
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
       }
     });
-    // images
-    if (typeof images !== 'undefined') {
-      pngSuite.add('images-file-file', function () {
-        images(fixtures.inputPng)
-          .resize(width, height)
-          .save(fixtures.outputPng);
-      });
-    }
     // sharp
     pngSuite.add('sharp-buffer-file', {
       defer: true,
+      minSamples,
       fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputPng, function (err) {
+          .png({ compressionLevel: 6 })
+          .toFile(outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -857,24 +804,27 @@ async.series({
       }
     }).add('sharp-buffer-buffer', {
       defer: true,
+      minSamples,
       fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .png({ compressionLevel: 6 })
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
       }
     }).add('sharp-file-file', {
       defer: true,
+      minSamples,
       fn: function (deferred) {
-        sharp(fixtures.inputPng)
+        sharp(fixtures.inputPngAlphaPremultiplicationLarge)
           .resize(width, height)
-          .toFile(fixtures.outputPng, function (err) {
+          .png({ compressionLevel: 6 })
+          .toFile(outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -884,44 +834,60 @@ async.series({
       }
     }).add('sharp-file-buffer', {
       defer: true,
+      minSamples,
       fn: function (deferred) {
-        sharp(fixtures.inputPng)
+        sharp(fixtures.inputPngAlphaPremultiplicationLarge)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .png({ compressionLevel: 6 })
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
       }
     }).add('sharp-progressive', {
       defer: true,
+      minSamples,
       fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .png({ progressive: true })
+          .png({ compressionLevel: 6, progressive: true })
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
       }
     }).add('sharp-adaptiveFiltering', {
       defer: true,
+      minSamples,
       fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .png({ adaptiveFiltering: true })
+          .png({ adaptiveFiltering: true, compressionLevel: 6 })
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
+            if (err) {
+              throw err;
+            } else {
+              deferred.resolve();
+            }
+          });
+      }
+    }).add('sharp-compressionLevel=9', {
+      defer: true,
+      minSamples,
+      fn: function (deferred) {
+        sharp(inputPngBuffer)
+          .resize(width, height)
+          .png({ compressionLevel: 9 })
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -941,7 +907,7 @@ async.series({
       fn: function (deferred) {
         sharp(inputWebPBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputWebP, function (err) {
+          .toFile(outputWebP, function (err) {
             if (err) {
               throw err;
             } else {
@@ -954,11 +920,10 @@ async.series({
       fn: function (deferred) {
         sharp(inputWebPBuffer)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -968,7 +933,7 @@ async.series({
       fn: function (deferred) {
         sharp(fixtures.inputWebP)
           .resize(width, height)
-          .toFile(fixtures.outputWebP, function (err) {
+          .toFile(outputWebP, function (err) {
             if (err) {
               throw err;
             } else {
@@ -981,11 +946,10 @@ async.series({
       fn: function (deferred) {
         sharp(fixtures.inputWebP)
           .resize(width, height)
-          .toBuffer(function (err, buffer) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
-              assert.notStrictEqual(null, buffer);
               deferred.resolve();
             }
           });
@@ -997,7 +961,9 @@ async.series({
     }).run();
   }
 }, function (err, results) {
-  assert(!err, err);
+  if (err) {
+    throw err;
+  }
   Object.keys(results).forEach(function (format) {
     if (results[format].toString().substr(0, 5) !== 'sharp') {
       console.log('sharp was slower than ' + results[format] + ' for ' + format);

test/bench/random.js

@@ -23,7 +23,7 @@ new Benchmark.Suite('random').add('imagemagick', {
   fn: function (deferred) {
     imagemagick.resize({
       srcPath: fixtures.inputJpg,
-      dstPath: fixtures.outputJpg,
+      dstPath: fixtures.path('output.jpg'),
       quality: 0.8,
       width: randomDimension(),
       height: randomDimension(),

test/bench/run-with-docker.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -e
+
+if ! type docker >/dev/null; then
+  echo "Please install docker"
+  exit 1
+fi
+
+BRANCH=$(git branch --show-current)
+echo "Running sharp performance tests using $BRANCH branch"
+
+docker build --build-arg "BRANCH=$BRANCH" -t sharp-test-bench .
+docker run --rm -it sharp-test-bench

test/coverage/report.sh

@@ -1,6 +0,0 @@
-#!/bin/sh
-
-CPPFLAGS="--coverage" LDFLAGS="--coverage" npm rebuild
-npm test
-geninfo --no-external --base-directory src --output-file coverage/sharp.info build/Release/obj.target/sharp/src
-genhtml --title sharp --demangle-cpp --output-directory coverage/sharp coverage/*.info