Release v0.28.3

Fixes bug where certain input values for top/left parameters
in composite can conflict with clipping logic, resulting in
inaccurate alignment in output.

.cirrus.yml

@@ -5,11 +5,12 @@ task:
   name: FreeBSD 13.0
   env:
     IGNORE_OSVERSION: yes
+  skip_notifications: true
   prerequisites_script:
     - pkg update -f
     - pkg upgrade -y
     - pkg install -y pkgconf vips node npm
   install_script:
-    - npm install --unsafe-perm
+    - npm install --build-from-source --unsafe-perm
   test_script:
     - npm test

.github/CONTRIBUTING.md

@@ -27,7 +27,7 @@ Please select the `master` branch as the destination for your Pull Request so yo
 
 Please squash your changes into a single commit using a command like `git rebase -i upstream/master`.
 
-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
 

.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/installation.md

@@ -11,7 +11,9 @@ Have you ensured the architecture and platform of Node.js used for `npm install`
 
 Are you using the latest version? Is the version currently in use as reported by `npm ls sharp` the same as the latest version as reported by `npm view sharp dist-tags.latest`?
 
-If you are installing as a `root` or `sudo` user, have you tried with the `npm install --unsafe-perm` flag?
+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, 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?
 

.github/workflows/ci.yml

@@ -0,0 +1,87 @@
+on:
+  - push
+  - pull_request
+jobs:
+  CI:
+    runs-on: ${{ matrix.os }}
+    container: ${{ matrix.container }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-20.04
+            container: centos:7
+            nodejs_version: 10
+            coverage: true
+            prebuild: true
+          - os: ubuntu-20.04
+            container: centos:7
+            nodejs_version: 12
+          - os: ubuntu-20.04
+            container: centos:7
+            nodejs_version: 14
+          - os: ubuntu-20.04
+            container: centos:7
+            nodejs_version: 16
+          - os: ubuntu-20.04
+            container: node:10-alpine3.11
+            prebuild: true
+          - os: ubuntu-20.04
+            container: node:12-alpine3.11
+          - os: ubuntu-20.04
+            container: node:14-alpine3.11
+          - os: ubuntu-20.04
+            container: node:14-alpine3.13
+          - os: ubuntu-20.04
+            container: node:16-alpine3.11
+          - os: macos-10.15
+            nodejs_version: 10
+            prebuild: true
+          - os: macos-10.15
+            nodejs_version: 12
+          - os: macos-10.15
+            nodejs_version: 14
+          - os: macos-10.15
+            nodejs_version: 16
+          - os: windows-2019
+            nodejs_version: 10
+            prebuild: true
+          - os: windows-2019
+            nodejs_version: 12
+          - os: windows-2019
+            nodejs_version: 14
+          - os: windows-2019
+            nodejs_version: 16
+    steps:
+      - name: Dependencies (Linux glibc)
+        if: contains(matrix.container, 'centos')
+        run: |
+          curl -sL https://rpm.nodesource.com/setup_${{ matrix.nodejs_version }}.x | bash -
+          yum install -y gcc-c++ make git python3 nodejs
+      - name: Dependencies (Linux musl)
+        if: contains(matrix.container, 'alpine')
+        run: apk add build-base git python3 --update-cache
+      - name: Dependencies (macOS, Windows)
+        if: contains(matrix.os, 'macos') || contains(matrix.os, 'windows')
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.nodejs_version }}
+      - name: Checkout
+        uses: actions/checkout@v2
+      - 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: Coverage
+        if: matrix.coverage
+        uses: coverallsapp/github-action@v1.1.2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Prebuild
+        if: matrix.prebuild && startsWith(github.ref, 'refs/tags/')
+        env:
+          prebuild_upload: ${{ secrets.GITHUB_TOKEN }}
+        run: npx prebuild --runtime napi --target 3

.travis.yml

@@ -1,81 +1,19 @@
 jobs:
   include:
-    - name: "Linux x64 (CentOS 7, glibc 2.17) - Node.js 10"
-      os: linux
-      dist: bionic
-      language: shell
-      before_install:
-        - sudo docker run -dit --name sharp --env CI --env TRAVIS_TAG --env prebuild_upload --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp centos:7
-        - sudo docker exec sharp bash -c "curl -sL https://rpm.nodesource.com/setup_10.x | bash -"
-        - sudo docker exec sharp yum install -y gcc-c++ make git nodejs
-      install: sudo docker exec sharp bash -c "npm install --unsafe-perm"
-      script: sudo docker exec sharp bash -c "npm test"
-
-    - name: "Linux x64 (CentOS 7, glibc 2.17) - Node.js 12"
-      os: linux
-      dist: bionic
-      language: shell
-      before_install:
-        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp centos:7
-        - sudo docker exec sharp bash -c "curl -sL https://rpm.nodesource.com/setup_12.x | bash -"
-        - sudo docker exec sharp yum install -y gcc-c++ make git nodejs
-      install: sudo docker exec sharp bash -c "npm install --unsafe-perm"
-      script: sudo docker exec sharp bash -c "npm test"
-
-    - name: "Linux x64 (CentOS 7, glibc 2.17) - Node.js 14"
-      os: linux
-      dist: bionic
-      language: shell
-      before_install:
-        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp centos:7
-        - sudo docker exec sharp bash -c "curl -sL https://rpm.nodesource.com/setup_14.x | bash -"
-        - sudo docker exec sharp yum install -y gcc-c++ make git nodejs
-      install: sudo docker exec sharp bash -c "npm install --unsafe-perm"
-      script: sudo docker exec sharp bash -c "npm test"
-
-    - name: "Linux x64 (Alpine 3.9, musl 1.1.20) - Node.js 10"
-      os: linux
-      dist: bionic
-      language: shell
-      before_install:
-        - sudo docker run -dit --name sharp --env CI --env TRAVIS_TAG --env prebuild_upload --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:10.17.0-alpine3.9 # https://github.com/nodejs/docker-node/issues/1158
-        - sudo docker exec sharp apk add build-base git python2 --update-cache
-      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
-      script: sudo docker exec sharp sh -c "npm test"
-
-    - name: "Linux x64 (Alpine 3.11, musl 1.1.20) - Node.js 12"
-      os: linux
-      dist: bionic
-      language: shell
-      before_install:
-        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:12.0-alpine
-        - sudo docker exec sharp apk add build-base git python2 --update-cache
-      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
-      script: sudo docker exec sharp sh -c "npm test"
-
-    - name: "Linux x64 (Alpine 3.11, musl 1.1.20) - Node.js 14"
-      os: linux
-      dist: bionic
-      language: shell
-      before_install:
-        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:14.0-alpine
-        - sudo docker exec sharp apk add build-base git python2 --update-cache
-      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
-      script: sudo docker exec sharp sh -c "npm test"
-
     - name: "Linux ARM64v8 (Debian 11, glibc 2.29) - Node.js 10"
       arch: arm64
       os: linux
       dist: bionic
       language: shell
       before_install:
-        - sudo docker run -dit --name sharp --env CI --env TRAVIS_TAG --env prebuild_upload --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp arm64v8/debian:bullseye
-        - sudo docker exec sharp sh -c "apt-get update && apt-get install -y build-essential git python2 curl"
+        - sudo docker run -dit --name sharp --volume "${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"
         - 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_10.x sid main' >/etc/apt/sources.list.d/nodesource.list"
         - sudo docker exec sharp sh -c "apt-get update && apt-get install -y nodejs=10.*"
-      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
       script: sudo docker exec sharp sh -c "npm test"
+      after_success: "[[ -n $TRAVIS_TAG ]] && sudo docker exec --env prebuild_upload sharp sh -c \"npx prebuild --runtime napi --target 3\""
 
     - name: "Linux ARM64v8 (Debian 11, glibc 2.29) - Node.js 12"
       arch: arm64
@@ -83,12 +21,12 @@ jobs:
       dist: bionic
       language: shell
       before_install:
-        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp arm64v8/debian:bullseye
-        - sudo docker exec sharp sh -c "apt-get update && apt-get install -y build-essential git python2 curl"
+        - sudo docker run -dit --name sharp --volume "${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"
         - 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_12.x sid main' >/etc/apt/sources.list.d/nodesource.list"
         - sudo docker exec sharp sh -c "apt-get update && apt-get install -y nodejs"
-      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
       script: sudo docker exec sharp sh -c "npm test"
 
     - name: "Linux ARM64v8 (Debian 11, glibc 2.29) - Node.js 14"
@@ -97,43 +35,74 @@ jobs:
       dist: bionic
       language: shell
       before_install:
-        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp arm64v8/debian:bullseye
-        - sudo docker exec sharp sh -c "apt-get update && apt-get install -y build-essential git python2 curl"
+        - sudo docker run -dit --name sharp --volume "${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"
         - 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"
-      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
       script: sudo docker exec sharp sh -c "npm test"
 
-    - name: "macOS (10.13) - Node.js 10"
-      os: osx
-      osx_image: xcode10.1
-      language: node_js
-      node_js: "10"
-
-    - name: "macOS (10.13) - Node.js 12"
-      os: osx
-      osx_image: xcode10.1
-      language: node_js
-      node_js: "12"
-      before_install: unset prebuild_upload
-
-    - name: "macOS (10.13) - Node.js 14"
-      os: osx
-      osx_image: xcode10.1
-      language: node_js
-      node_js: "14"
-      before_install: unset prebuild_upload
-
-    - name: "Unit test coverage report"
+    - name: "Linux ARM64v8 (Debian 11, glibc 2.29) - Node.js 16"
+      arch: arm64
       os: linux
       dist: bionic
-      language: node_js
-      node_js: "13"
-      before_install: unset prebuild_upload
-      after_success:
-        - npm install coveralls
-        - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js
+      language: shell
+      before_install:
+        - sudo chown 0.0 ${PWD}
+        - sudo docker run -dit --name sharp --volume "${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"
+        - 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_16.x sid main' >/etc/apt/sources.list.d/nodesource.list"
+        - sudo docker exec sharp sh -c "apt-get update && apt-get install -y nodejs"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
+      script: sudo docker exec sharp sh -c "npm test"
+
+    - name: "Linux ARM64v8 (Alpine 3.11, musl 1.1.24) - Node.js 10"
+      arch: arm64
+      os: linux
+      dist: focal
+      language: shell
+      before_install:
+        - sudo docker run -dit --name sharp --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:10-alpine3.11
+        - sudo docker exec sharp sh -c "apk add build-base git python3 --update-cache"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
+      script: sudo docker exec sharp sh -c "npm test"
+      after_success: "[[ -n $TRAVIS_TAG ]] && sudo docker exec --env prebuild_upload sharp sh -c \"npx prebuild --runtime napi --target 3\""
+
+    - name: "Linux ARM64v8 (Alpine 3.11, musl 1.1.24) - Node.js 12"
+      arch: arm64
+      os: linux
+      dist: focal
+      language: shell
+      before_install:
+        - sudo docker run -dit --name sharp --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:12-alpine3.11
+        - sudo docker exec sharp sh -c "apk add build-base git python3 --update-cache"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
+      script: sudo docker exec sharp sh -c "npm test"
+
+    - name: "Linux ARM64v8 (Alpine 3.11, musl 1.1.24) - Node.js 14"
+      arch: arm64
+      os: linux
+      dist: focal
+      language: shell
+      before_install:
+        - sudo docker run -dit --name sharp --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:14-alpine3.11
+        - sudo docker exec sharp sh -c "apk add build-base git python3 --update-cache"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
+      script: sudo docker exec sharp sh -c "npm test"
+
+    - name: "Linux ARM64v8 (Alpine 3.11, musl 1.1.24) - Node.js 16"
+      arch: arm64
+      os: linux
+      dist: focal
+      language: shell
+      before_install:
+        - sudo chown 0.0 ${PWD}
+        - sudo docker run -dit --name sharp --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:16-alpine3.11
+        - sudo docker exec sharp sh -c "apk add build-base git python3 --update-cache"
+      install: sudo docker exec sharp sh -c "npm install --build-from-source --unsafe-perm"
+      script: sudo docker exec sharp sh -c "npm test"
 
 cache:
   npm: false

README.md

@@ -4,7 +4,7 @@
 
 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 and AVIF images of varying dimensions.
 
 Resizing an image is typically 4x-5x faster than using the
 quickest ImageMagick and GraphicsMagick settings
@@ -16,9 +16,17 @@ 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 v10.16.0+
+Most modern macOS, Windows and Linux systems running Node.js v10+
 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
@@ -43,6 +51,7 @@ sharp(inputBuffer)
 sharp('input.jpg')
   .rotate()
   .resize(200)
+  .jpeg({ mozjpeg: true })
   .toBuffer()
   .then( data => { ... })
   .catch( err => { ... });
@@ -84,25 +93,17 @@ readableStream
   .pipe(writableStream);
 ```
 
-[![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.svg?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)
-[![N-API v3](https://img.shields.io/badge/N--API-v3-green.svg)](https://nodejs.org/dist/latest/docs/api/n-api.html#n_api_n_api_version_matrix)
-
-### 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).
-
-### Contributing
+## Contributing
 
 A [guide for contributors](https://github.com/lovell/sharp/blob/master/.github/CONTRIBUTING.md)
 covers reporting bugs, requesting features and submitting code changes.
 
-### Licensing
+[![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.svg?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)
+[![N-API v3](https://img.shields.io/badge/N--API-v3-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, 2019, 2020 Lovell Fuller and contributors.
+## Licensing
+
+Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 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.

appveyor.yml

@@ -1,26 +1,18 @@
-os: Visual Studio 2017
+os: Visual Studio 2019
 version: "{build}"
 build: off
+platform: x86
 environment:
   matrix:
   - nodejs_version: "10"
-    platform: x86
-  - nodejs_version: "10"
-    platform: x64
+    prebuild: true
   - nodejs_version: "12"
-    platform: x86
-    prebuild_upload: ""
-  - nodejs_version: "12"
-    platform: x64
-    prebuild_upload: ""
-  - nodejs_version: "14.2.0"
-    platform: x86
-    prebuild_upload: ""
   - nodejs_version: "14"
-    platform: x64
-    prebuild_upload: ""
+  - nodejs_version: "16"
 install:
-  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version) $env:platform
-  - npm install
+  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)
+  - npm install --build-from-source
 test_script:
   - npm test
+on_success:
+  - if [%prebuild%] == [true] if [%APPVEYOR_REPO_TAG%] == [true] npx prebuild --runtime napi --target 3

binding.gyp

@@ -140,8 +140,7 @@
             'link_settings': {
               'library_dirs': ['<(sharp_vendor_dir)/lib'],
               'libraries': [
-                'libvips-cpp.42.dylib',
-                'libvips.42.dylib'
+                'libvips-cpp.42.dylib'
               ]
             },
             'xcode_settings': {
@@ -153,13 +152,12 @@
           }],
           ['OS == "linux"', {
             'defines': [
-              '_GLIBCXX_USE_CXX11_ABI=0'
+              '_GLIBCXX_USE_CXX11_ABI=1'
             ],
             'link_settings': {
               'library_dirs': ['<(sharp_vendor_dir)/lib'],
               'libraries': [
-                '-l:libvips-cpp.so.42',
-                '-l:libvips.so.42'
+                '-l:libvips-cpp.so.42'
               ],
               'ldflags': [
                 # Ensure runtime linking is relative to sharp.node

docs/README.md

@@ -4,7 +4,7 @@
 
 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, AVIF and WebP images of varying dimensions.
 
 Resizing an image is typically 4x-5x faster than using the
 quickest ImageMagick and GraphicsMagick settings
@@ -16,14 +16,14 @@ 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 v10.16.0+
+Most modern macOS, Windows and Linux systems running Node.js v10+
 do not require any additional install or runtime dependencies.
 
 ### Formats
 
-This module supports reading JPEG, PNG, WebP, TIFF, GIF and SVG images.
+This module supports reading JPEG, PNG, WebP, AVIF, TIFF, GIF and SVG images.
 
-Output images can be in JPEG, PNG, WebP and TIFF formats as well as uncompressed raw pixel data.
+Output images can be in JPEG, PNG, WebP, AVIF and TIFF formats as well as uncompressed raw pixel data.
 
 Streams, Buffer objects and the filesystem can be used for input and output.
 
@@ -50,6 +50,10 @@ 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
@@ -66,7 +70,7 @@ covers reporting bugs, requesting features and submitting code changes.
 
 ### Licensing
 
-Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Lovell Fuller and contributors.
+Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 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.

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
@@ -18,23 +20,38 @@ Returns **Sharp**
 
 ## ensureAlpha
 
-Ensure alpha channel, if missing. The added alpha channel will be fully opaque. This is a no-op if the image already has an alpha channel.
+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
-sharp('rgb.jpg')
+// rgba.png will be a 4 channel image with a fully-opaque alpha channel
+await sharp('rgb.jpg')
   .ensureAlpha()
-  .toFile('rgba.png', function(err, info) {
-    // rgba.png is a 4 channel image with a fully opaque alpha channel
-  });
+  .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
+*   **since**: 0.21.2
 
 ## extractChannel
 
@@ -42,7 +59,7 @@ Extract a single channel from a multi-channel image.
 
 ### Parameters
 
--   `channel` **([number][1] \| [string][2])** zero-indexed channel/band number to extract, or `red`, `green`, `blue` or `alpha`.
+*   `channel` **([number][2] | [string][4])** zero-indexed channel/band number to extract, or `red`, `green`, `blue` or `alpha`.
 
 ### Examples
 
@@ -56,7 +73,7 @@ sharp(input)
    });
 ```
 
--   Throws **[Error][3]** Invalid channel
+*   Throws **[Error][3]** Invalid channel
 
 Returns **Sharp** 
 
@@ -67,19 +84,20 @@ 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.
--   CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha.
+*   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.
 
 ### Parameters
 
--   `images` **([Array][4]<([string][2] \| [Buffer][5])> | [string][2] \| [Buffer][5])** one or more images (file paths, Buffers).
--   `options` **[Object][6]** image options, see `sharp()` constructor.
+*   `images` **([Array][5]<([string][4] | [Buffer][6])> | [string][4] | [Buffer][6])** one or more images (file paths, Buffers).
+*   `options` **[Object][7]** image options, see `sharp()` constructor.
 
+<!---->
 
--   Throws **[Error][3]** Invalid parameters
+*   Throws **[Error][3]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -89,7 +107,7 @@ 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
 
@@ -103,18 +121,20 @@ sharp('3-channel-rgb-input.png')
   });
 ```
 
--   Throws **[Error][3]** Invalid parameters
+*   Throws **[Error][3]** Invalid parameters
 
 Returns **Sharp** 
 
-[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

@@ -7,10 +7,11 @@ 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.
 
+<!---->
 
--   Throws **[Error][4]** Invalid parameter
+*   Throws **[Error][4]** Invalid parameter
 
 Returns **Sharp** 
 
@@ -25,7 +26,7 @@ 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** 
 
@@ -35,7 +36,7 @@ Alternative spelling of `greyscale`.
 
 ### Parameters
 
--   `grayscale` **[Boolean][5]**  (optional, default `true`)
+*   `grayscale` **[Boolean][5]**  (optional, default `true`)
 
 Returns **Sharp** 
 
@@ -46,10 +47,18 @@ 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` [...][6]
 
+### Examples
 
--   Throws **[Error][4]** Invalid parameters
+```javascript
+// Output 16 bits per pixel RGB
+await sharp(input)
+ .toColourspace('rgb16')
+ .toFile('16-bpp.png')
+```
+
+*   Throws **[Error][4]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -59,10 +68,11 @@ 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** 
 

docs/api-composite.md

@@ -19,24 +19,30 @@ and [https://www.cairographics.org/operators/][2]
 
 ### Parameters
 
--   `images` **[Array][3]<[Object][4]>** Ordered list of images to composite
-    -   `images[].input` **([Buffer][5] \| [String][6])?** Buffer containing image data, String containing the path to an image file, or Create object (see below)
-        -   `images[].input.create` **[Object][4]?** describes a blank overlay to be created.
-            -   `images[].input.create.width` **[Number][7]?** 
-            -   `images[].input.create.height` **[Number][7]?** 
-            -   `images[].input.create.channels` **[Number][7]?** 3-4
-            -   `images[].input.create.background` **([String][6] \| [Object][4])?** parsed by the [color][8] module to extract values for red, green, blue and alpha.
-    -   `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]?** 
-        -   `images[].raw.height` **[Number][7]?** 
-        -   `images[].raw.channels` **[Number][7]?** 
+*   `images` **[Array][3]<[Object][4]>** Ordered list of images to composite
+
+    *   `images[].input` **([Buffer][5] | [String][6])?** Buffer containing image data, String containing the path to an image file, or Create object (see below)
+
+        *   `images[].input.create` **[Object][4]?** describes a blank overlay to be created.
+
+            *   `images[].input.create.width` **[Number][7]?** 
+            *   `images[].input.create.height` **[Number][7]?** 
+            *   `images[].input.create.channels` **[Number][7]?** 3-4
+            *   `images[].input.create.background` **([String][6] | [Object][4])?** parsed by the [color][8] module to extract values for red, green, blue and alpha.
+    *   `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]?** 
+        *   `images[].raw.height` **[Number][7]?** 
+        *   `images[].raw.channels` **[Number][7]?** 
+    *   `images[].failOnError` **[boolean][9]** @see [constructor parameters][10] (optional, default `true`)
+    *   `images[].limitInputPixels` **([number][7] | [boolean][9])** @see [constructor parameters][10] (optional, default `268402689`)
 
 ### Examples
 
@@ -57,13 +63,13 @@ sharp('input.png')
   });
 ```
 
--   Throws **[Error][10]** Invalid parameters
+*   Throws **[Error][11]** Invalid parameters
 
 Returns **Sharp** 
 
 **Meta**
 
--   **since**: 0.22.0
+*   **since**: 0.22.0
 
 [1]: https://libvips.github.io/libvips/API/current/libvips-conversion.html#VipsBlendMode
 
@@ -83,4 +89,6 @@ Returns **Sharp**
 
 [9]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
 
-[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+[10]: /api-constructor#parameters
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error

docs/api-constructor.md

@@ -4,7 +4,7 @@
 
 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, 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.
@@ -13,32 +13,43 @@ Implements the [stream.Duplex][1] class.
 
 ### Parameters
 
--   `input` **([Buffer][2] \| [string][3])?** if present, can be
-     a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
-     a String containing the filesystem path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file.
-     JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
--   `options` **[Object][4]?** if present, is an Object with optional attributes.
-    -   `options.failOnError` **[boolean][5]** by default halt processing and raise an error when loading invalid images.
-         Set this flag to `false` if you'd rather apply a "best effort" to decode images, even if the data is corrupt or invalid. (optional, default `true`)
-    -   `options.limitInputPixels` **([number][6] \| [boolean][5])** Do not process input images where the number of pixels
-         (width x height) exceeds this limit. Assumes image dimensions contained in the input metadata can be trusted.
-         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.sequentialRead` **[boolean][5]** 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. (optional, default `false`)
-    -   `options.density` **[number][6]** number representing the DPI for vector images in the range 1 to 100000. (optional, default `72`)
-    -   `options.pages` **[number][6]** number of pages to extract for multi-page input (GIF, TIFF, PDF), use -1 for all pages. (optional, default `1`)
-    -   `options.page` **[number][6]** page number to start extracting from for multi-page input (GIF, TIFF, PDF), zero based. (optional, default `0`)
-    -   `options.level` **[number][6]** level to extract from a multi-level input (OpenSlide), zero based. (optional, default `0`)
-    -   `options.animated` **[boolean][5]** Set to `true` to read all frames/pages of an animated image (equivalent of setting `pages` to `-1`). (optional, default `false`)
-    -   `options.raw` **[Object][4]?** describes raw pixel input image data. See `raw()` for pixel ordering.
-        -   `options.raw.width` **[number][6]?** 
-        -   `options.raw.height` **[number][6]?** 
-        -   `options.raw.channels` **[number][6]?** 1-4
-    -   `options.create` **[Object][4]?** describes a new image to be created.
-        -   `options.create.width` **[number][6]?** 
-        -   `options.create.height` **[number][6]?** 
-        -   `options.create.channels` **[number][6]?** 3-4
-        -   `options.create.background` **([string][3] \| [Object][4])?** parsed by the [color][7] module to extract values for red, green, blue and alpha.
+*   `input` **([Buffer][2] | [Uint8Array][3] | [Uint8ClampedArray][4] | [string][5])?** if present, can be
+    a Buffer / Uint8Array / Uint8ClampedArray containing JPEG, PNG, WebP, AVIF, GIF, SVG, TIFF or 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.
+*   `options` **[Object][6]?** if present, is an Object with optional attributes.
+
+    *   `options.failOnError` **[boolean][7]** by default halt processing and raise an error when loading invalid images.
+        Set this flag to `false` if you'd rather apply a "best effort" to decode images, even if the data is corrupt or invalid. (optional, default `true`)
+    *   `options.limitInputPixels` **([number][8] | [boolean][7])** Do not process input images where the number of pixels
+        (width x height) exceeds this limit. Assumes image dimensions contained in the input metadata can be trusted.
+        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.sequentialRead` **[boolean][7]** 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. (optional, default `false`)
+    *   `options.density` **[number][8]** number representing the DPI for vector images in the range 1 to 100000. (optional, default `72`)
+    *   `options.pages` **[number][8]** number of pages to extract for multi-page input (GIF, WebP, AVIF, TIFF, PDF), use -1 for all pages. (optional, default `1`)
+    *   `options.page` **[number][8]** page number to start extracting from for multi-page input (GIF, WebP, AVIF, TIFF, PDF), zero based. (optional, default `0`)
+    *   `options.subifd` **[number][8]** subIFD (Sub Image File Directory) to extract for OME-TIFF, defaults to main image. (optional, default `-1`)
+    *   `options.level` **[number][8]** level to extract from a multi-level input (OpenSlide), zero based. (optional, default `0`)
+    *   `options.animated` **[boolean][7]** Set to `true` to read all frames/pages of an animated image (equivalent of setting `pages` to `-1`). (optional, default `false`)
+    *   `options.raw` **[Object][6]?** describes raw pixel input image data. See `raw()` for pixel ordering.
+
+        *   `options.raw.width` **[number][8]?** integral number of pixels wide.
+        *   `options.raw.height` **[number][8]?** integral number of pixels high.
+        *   `options.raw.channels` **[number][8]?** integral number of channels, between 1 and 4.
+        *   `options.raw.premultiplied` **[boolean][7]?** specifies that the raw input has already been premultiplied, set to `true`
+            to avoid sharp premultiplying the image. (optional, default `false`)
+    *   `options.create` **[Object][6]?** describes a new image to be created.
+
+        *   `options.create.width` **[number][8]?** integral number of pixels wide.
+        *   `options.create.height` **[number][8]?** integral number of pixels high.
+        *   `options.create.channels` **[number][8]?** integral number of channels, either 3 (RGB) or 4 (RGBA).
+        *   `options.create.background` **([string][5] | [Object][6])?** parsed by the [color][9] module to extract values for red, green, blue and alpha.
+        *   `options.create.noise` **[Object][6]?** describes a noise to be created.
+
+            *   `options.create.noise.type` **[string][5]?** type of generated noise, currently only `gaussian` is supported.
+            *   `options.create.noise.mean` **[number][8]?** mean of pixels in generated noise.
+            *   `options.create.noise.sigma` **[number][8]?** standard deviation of pixels in generated noise.
 
 ### Examples
 
@@ -84,9 +95,40 @@ sharp({
 await sharp('in.gif', { animated: true }).toFile('out.webp');
 ```
 
--   Throws **[Error][8]** Invalid parameters
+```javascript
+// 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');
+```
 
-Returns **[Sharp][9]** 
+```javascript
+// Generate RGB Gaussian noise
+await sharp({
+  create: {
+    width: 300,
+    height: 200,
+    channels: 3,
+    noise: {
+      type: 'gaussian',
+      mean: 128,
+      sigma: 30
+    }
+ }
+}).toFile('noise.png');
+```
+
+*   Throws **[Error][10]** Invalid parameters
+
+Returns **[Sharp][11]** 
 
 ## clone
 
@@ -154,22 +196,26 @@ Promise.all(promises)
   });
 ```
 
-Returns **[Sharp][9]** 
+Returns **[Sharp][11]** 
 
 [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/String
+[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array
 
-[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray
 
-[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
 
-[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
 
-[7]: https://www.npmjs.org/package/color
+[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
 
-[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
 
-[9]: #sharp
+[9]: https://www.npmjs.org/package/color
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[11]: #sharp

docs/api-input.md

@@ -5,34 +5,35 @@
 Fast access to (uncached) image metadata without decoding any compressed image data.
 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)
--   `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
--   `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
--   `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
--   `tifftagPhotoshop`: Buffer containing raw TIFFTAG_PHOTOSHOP data, if present
+*   `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)
+*   `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
+*   `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
+*   `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
+*   `tifftagPhotoshop`: Buffer containing raw TIFFTAG_PHOTOSHOP data, if present
 
 ### Parameters
 
--   `callback` **[Function][4]?** called with the arguments `(err, metadata)`
+*   `callback` **[Function][4]?** called with the arguments `(err, metadata)`
 
 ### Examples
 
@@ -51,32 +52,32 @@ image
   });
 ```
 
-Returns **([Promise][5]<[Object][6]> | Sharp)** 
+Returns **([Promise][5]<[Object][6]> | Sharp)** 
 
 ## stats
 
 Access to pixel-derived image statistics for every channel in the image.
 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)
-    -   `max` (maximum value in the channel)
-    -   `sum` (sum of all values in a channel)
-    -   `squaresSum` (sum of squared values in a channel)
-    -   `mean` (mean of 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)
-    -   `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`: 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)
--   `sharpness`: Estimation of greyscale sharpness based on the standard deviation of a Laplacian convolution, discarding alpha channel if any (experimental)
--   `dominant`: Object containing most dominant sRGB colour based on a 4096-bin 3D histogram (experimental)
+*   `channels`: Array of channel statistics for each channel in the image. Each channel statistic contains
+    *   `min` (minimum value in the channel)
+    *   `max` (maximum value in the channel)
+    *   `sum` (sum of all values in a channel)
+    *   `squaresSum` (sum of squared values in a channel)
+    *   `mean` (mean of 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)
+    *   `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`: 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)
+*   `sharpness`: Estimation of greyscale sharpness based on the standard deviation of a Laplacian convolution, discarding alpha channel if any (experimental)
+*   `dominant`: Object containing most dominant sRGB colour based on a 4096-bin 3D histogram (experimental)
 
 ### Parameters
 
--   `callback` **[Function][4]?** called with the arguments `(err, stats)`
+*   `callback` **[Function][4]?** called with the arguments `(err, stats)`
 
 ### Examples
 
@@ -94,7 +95,7 @@ const { entropy, sharpness, dominant } = await sharp(input).stats();
 const { r, g, b } = dominant;
 ```
 
-Returns **[Promise][5]&lt;[Object][6]>** 
+Returns **[Promise][5]<[Object][6]>** 
 
 [1]: https://libvips.github.io/libvips/API/current/VipsImage.html#VipsInterpretation
 

docs/api-operation.md

@@ -21,9 +21,10 @@ for example `rotate(x).extract(y)` will produce a different result to `extract(y
 
 ### Parameters
 
--   `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"`)
+*   `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
 
@@ -39,7 +40,7 @@ const pipeline = sharp()
 readableStream.pipe(pipeline);
 ```
 
--   Throws **[Error][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -50,7 +51,7 @@ The use of `flip` implies the removal of the EXIF `Orientation` tag, if any.
 
 ### Parameters
 
--   `flip` **[Boolean][6]**  (optional, default `true`)
+*   `flip` **[Boolean][6]**  (optional, default `true`)
 
 Returns **Sharp** 
 
@@ -61,10 +62,66 @@ The use of `flop` implies the removal of the EXIF `Orientation` tag, if any.
 
 ### Parameters
 
--   `flop` **[Boolean][6]**  (optional, default `true`)
+*   `flop` **[Boolean][6]**  (optional, default `true`)
 
 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** 
+
+**Meta**
+
+*   **since**: 0.27.0
+
 ## sharpen
 
 Sharpen the image.
@@ -74,12 +131,13 @@ Separate control over the level of sharpening in "flat" and "jagged" areas is av
 
 ### Parameters
 
--   `sigma` **[number][1]?** the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
--   `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`)
+*   `sigma` **[number][1]?** the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+*   `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`)
 
+<!---->
 
--   Throws **[Error][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -90,10 +148,11 @@ 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][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -105,21 +164,33 @@ 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`.
+*   `sigma` **[number][1]?** a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
 
+<!---->
 
--   Throws **[Error][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
 ## flatten
 
-Merge alpha transparency channel, if any, with a background.
+Merge alpha transparency channel, if any, with a background, then remove the alpha channel.
+
+See also [removeAlpha][8].
 
 ### Parameters
 
--   `options` **[Object][2]?** 
-    -   `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}`)
+*   `options` **[Object][2]?** 
+
+    *   `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}`)
+
+### Examples
+
+```javascript
+await sharp(rgbaInput)
+  .flatten({ background: '#F0A703' })
+  .toBuffer();
+```
 
 Returns **Sharp** 
 
@@ -135,11 +206,12 @@ Supply a second argument to use a different output gamma value, otherwise the fi
 
 ### Parameters
 
--   `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`)
+*   `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][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -149,7 +221,7 @@ Produce the "negative" of the image.
 
 ### Parameters
 
--   `negate` **[Boolean][6]**  (optional, default `true`)
+*   `negate` **[Boolean][6]**  (optional, default `true`)
 
 Returns **Sharp** 
 
@@ -159,7 +231,7 @@ Enhance output image contrast by stretching its luminance to cover the full dyna
 
 ### Parameters
 
--   `normalise` **[Boolean][6]**  (optional, default `true`)
+*   `normalise` **[Boolean][6]**  (optional, default `true`)
 
 Returns **Sharp** 
 
@@ -169,22 +241,50 @@ Alternative spelling of normalise.
 
 ### Parameters
 
--   `normalize` **[Boolean][6]**  (optional, default `true`)
+*   `normalize` **[Boolean][6]**  (optional, default `true`)
 
 Returns **Sharp** 
 
+## clahe
+
+Perform contrast limiting adaptive histogram equalization
+[CLAHE][9].
+
+This will, in general, enhance the clarity of the image by bringing out darker details.
+
+### Parameters
+
+*   `options` **[Object][2]** 
+
+    *   `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`)
+
+<!---->
+
+*   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp** 
+
+**Meta**
+
+*   **since**: 0.28.3
+
 ## convolve
 
 Convolve the image with the specified kernel.
 
 ### Parameters
 
--   `kernel` **[Object][2]** 
-    -   `kernel.width` **[number][1]** width of the kernel in pixels.
-    -   `kernel.height` **[number][1]** width of the kernel in pixels.
-    -   `kernel.kernel` **[Array][7]&lt;[number][1]>** Array of length `width*height` containing the kernel values.
-    -   `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`)
+*   `kernel` **[Object][2]** 
+
+    *   `kernel.width` **[number][1]** width of the kernel in pixels.
+    *   `kernel.height` **[number][1]** height of the kernel in pixels.
+    *   `kernel.kernel` **[Array][7]<[number][1]>** Array of length `width*height` containing the kernel values.
+    *   `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
 
@@ -202,23 +302,25 @@ sharp(input)
   });
 ```
 
--   Throws **[Error][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
 ## 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`)
--   `options` **[Object][2]?** 
-    -   `options.greyscale` **[Boolean][6]** convert to single channel greyscale. (optional, default `true`)
-    -   `options.grayscale` **[Boolean][6]** alternative spelling for greyscale. (optional, default `true`)
+*   `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][2]?** 
 
+    *   `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][5]** Invalid parameters
+<!---->
+
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -231,16 +333,19 @@ the selected bitwise boolean `operation` between the corresponding pixels of the
 
 ### Parameters
 
--   `operand` **([Buffer][8] \| [string][3])** Buffer containing image data or string containing the path to an image file.
--   `operator` **[string][3]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
--   `options` **[Object][2]?** 
-    -   `options.raw` **[Object][2]?** describes operand when using raw pixel data.
-        -   `options.raw.width` **[number][1]?** 
-        -   `options.raw.height` **[number][1]?** 
-        -   `options.raw.channels` **[number][1]?** 
+*   `operand` **([Buffer][10] | [string][3])** Buffer containing image data or string containing the path to an image file.
+*   `operator` **[string][3]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+*   `options` **[Object][2]?** 
 
+    *   `options.raw` **[Object][2]?** describes operand when using raw pixel data.
 
--   Throws **[Error][5]** Invalid parameters
+        *   `options.raw.width` **[number][1]?** 
+        *   `options.raw.height` **[number][1]?** 
+        *   `options.raw.channels` **[number][1]?** 
+
+<!---->
+
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -250,11 +355,12 @@ Apply the linear formula a \* input + b to the image (levels adjustment)
 
 ### Parameters
 
--   `a` **[number][1]** multiplier (optional, default `1.0`)
--   `b` **[number][1]** offset (optional, default `0.0`)
+*   `a` **[number][1]** multiplier (optional, default `1.0`)
+*   `b` **[number][1]** offset (optional, default `0.0`)
 
+<!---->
 
--   Throws **[Error][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -264,7 +370,7 @@ Recomb the image with the specified matrix.
 
 ### Parameters
 
--   `inputMatrix` **[Array][7]&lt;[Array][7]&lt;[number][1]>>** 3x3 Recombination matrix
+*   `inputMatrix` **[Array][7]<[Array][7]<[number][1]>>** 3x3 Recombination matrix
 
 ### Examples
 
@@ -282,13 +388,13 @@ sharp(input)
   });
 ```
 
--   Throws **[Error][5]** Invalid parameters
+*   Throws **[Error][5]** Invalid parameters
 
 Returns **Sharp** 
 
 **Meta**
 
--   **since**: 0.21.1
+*   **since**: 0.21.1
 
 ## modulate
 
@@ -296,10 +402,11 @@ Transforms the image using brightness, saturation and hue rotation.
 
 ### Parameters
 
--   `options` **[Object][2]?** 
-    -   `options.brightness` **[number][1]?** Brightness multiplier
-    -   `options.saturation` **[number][1]?** Saturation multiplier
-    -   `options.hue` **[number][1]?** Degrees for hue rotation
+*   `options` **[Object][2]?** 
+
+    *   `options.brightness` **[number][1]?** Brightness multiplier
+    *   `options.saturation` **[number][1]?** Saturation multiplier
+    *   `options.hue` **[number][1]?** Degrees for hue rotation
 
 ### Examples
 
@@ -327,7 +434,7 @@ Returns **Sharp**
 
 **Meta**
 
--   **since**: 0.22.1
+*   **since**: 0.22.1
 
 [1]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
 
@@ -343,4 +450,8 @@ Returns **Sharp**
 
 [7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
 
-[8]: https://nodejs.org/api/buffer.html
+[8]: /api-channel#removealpha
+
+[9]: https://en.wikipedia.org/wiki/Adaptive_histogram_equalization#Contrast_Limited_AHE
+
+[10]: https://nodejs.org/api/buffer.html

docs/api-output.md

@@ -5,7 +5,7 @@
 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, 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.
@@ -15,8 +15,8 @@ A `Promise` is returned when `callback` is not provided.
 
 ### Parameters
 
--   `fileOut` **[string][2]** the path to write the image data to.
--   `callback` **[Function][3]?** called on completion with two arguments `(err, info)`.
+*   `fileOut` **[string][2]** the path to write the image data to.
+*   `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`.
@@ -35,14 +35,14 @@ sharp(input)
   .catch(err => { ... });
 ```
 
--   Throws **[Error][4]** Invalid parameters
+*   Throws **[Error][4]** Invalid parameters
 
-Returns **[Promise][5]<[Object][6]>** 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 and raw pixel data output are supported.
 
 If no explicit format is set, the output format will match the input image, except GIF and SVG input which become PNG output.
 
@@ -51,19 +51,21 @@ See [withMetadata][1] for control over this.
 
 `callback`, if present, gets three arguments `(err, data, info)` where:
 
--   `err` is an error, if any.
--   `data` is the output image data.
--   `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`.
+*   `err` is an error, if any.
+*   `data` is the output image data.
+*   `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`.
 
 A `Promise` is returned when `callback` is not provided.
 
 ### Parameters
 
--   `options` **[Object][6]?** 
-    -   `options.resolveWithObject` **[boolean][7]?** Resolve the Promise with an Object containing `data` and `info` properties instead of resolving only with `data`.
--   `callback` **[Function][3]?** 
+*   `options` **[Object][6]?** 
+
+    *   `options.resolveWithObject` **[boolean][7]?** Resolve the Promise with an Object containing `data` and `info` properties instead of resolving only with `data`.
+*   `callback` **[Function][3]?** 
 
 ### Examples
 
@@ -86,7 +88,24 @@ sharp(input)
   .catch(err => { ... });
 ```
 
-Returns **[Promise][5]&lt;[Buffer][8]>** 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][8]>** when no callback is provided
 
 ## withMetadata
 
@@ -99,9 +118,12 @@ sRGB colour space and strip all metadata, including the removal of any ICC profi
 
 ### Parameters
 
--   `options` **[Object][6]?** 
-    -   `options.orientation` **[number][9]?** 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` **[Object][6]?** 
+
+    *   `options.orientation` **[number][9]?** 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][9]?** Number of pixels per inch (DPI).
 
 ### Examples
 
@@ -112,7 +134,26 @@ sharp('input.jpg')
   .then(info => { ... });
 ```
 
--   Throws **[Error][4]** Invalid parameters
+```javascript
+// Set "IFD0-Copyright" in output EXIF metadata
+const data = await sharp(input)
+  .withMetadata({
+    exif: {
+      IFD0: {
+        Copyright: 'Wernham Hogg'
+      }
+    }
+  })
+  .toBuffer();
+
+ * @example
+// Set output metadata to 96 DPI
+const data = await sharp(input)
+  .withMetadata({ density: 96 })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -122,8 +163,8 @@ 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
+*   `format` **([string][2] | [Object][6])** as a string or an Object with an 'id' attribute
+*   `options` **[Object][6]** output options
 
 ### Examples
 
@@ -134,7 +175,7 @@ const data = await sharp(input)
   .toBuffer();
 ```
 
--   Throws **[Error][4]** unsupported format or options
+*   Throws **[Error][4]** unsupported format or options
 
 Returns **Sharp** 
 
@@ -142,23 +183,23 @@ Returns **Sharp**
 
 Use these JPEG options for output image.
 
-Some of these options require the use of a globally-installed libvips compiled with support for mozjpeg.
-
 ### Parameters
 
--   `options` **[Object][6]?** output options
-    -   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `80`)
-    -   `options.progressive` **[boolean][7]** use progressive (interlace) scan (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.optimiseCoding` **[boolean][7]** optimise Huffman coding tables (optional, default `true`)
-    -   `options.optimizeCoding` **[boolean][7]** alternative spelling of optimiseCoding (optional, default `true`)
-    -   `options.trellisQuantisation` **[boolean][7]** apply trellis quantisation, requires libvips compiled with support for mozjpeg (optional, default `false`)
-    -   `options.overshootDeringing` **[boolean][7]** apply overshoot deringing, requires libvips compiled with support for mozjpeg (optional, default `false`)
-    -   `options.optimiseScans` **[boolean][7]** optimise progressive scans, forces progressive, requires libvips compiled with support for mozjpeg (optional, default `false`)
-    -   `options.optimizeScans` **[boolean][7]** alternative spelling of optimiseScans, requires libvips compiled with support for mozjpeg (optional, default `false`)
-    -   `options.quantisationTable` **[number][9]** quantization table to use, integer 0-8, requires libvips compiled with support for mozjpeg (optional, default `0`)
-    -   `options.quantizationTable` **[number][9]** alternative spelling of quantisationTable, requires libvips compiled with support for mozjpeg (optional, default `0`)
-    -   `options.force` **[boolean][7]** force JPEG output, otherwise attempt to use input format (optional, default `true`)
+*   `options` **[Object][6]?** output options
+
+    *   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `80`)
+    *   `options.progressive` **[boolean][7]** use progressive (interlace) scan (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.optimiseCoding` **[boolean][7]** optimise Huffman coding tables (optional, default `true`)
+    *   `options.optimizeCoding` **[boolean][7]** alternative spelling of optimiseCoding (optional, default `true`)
+    *   `options.mozjpeg` **[boolean][7]** use mozjpeg defaults, equivalent to `{ trellisQuantisation: true, overshootDeringing: true, optimiseScans: true, quantisationTable: 3 }` (optional, default `false`)
+    *   `options.trellisQuantisation` **[boolean][7]** apply trellis quantisation (optional, default `false`)
+    *   `options.overshootDeringing` **[boolean][7]** apply overshoot deringing (optional, default `false`)
+    *   `options.optimiseScans` **[boolean][7]** optimise progressive scans, forces progressive (optional, default `false`)
+    *   `options.optimizeScans` **[boolean][7]** alternative spelling of optimiseScans (optional, default `false`)
+    *   `options.quantisationTable` **[number][9]** quantization table to use, integer 0-8 (optional, default `0`)
+    *   `options.quantizationTable` **[number][9]** alternative spelling of quantisationTable (optional, default `0`)
+    *   `options.force` **[boolean][7]** force JPEG output, otherwise attempt to use input format (optional, default `true`)
 
 ### Examples
 
@@ -172,7 +213,14 @@ const data = await sharp(input)
   .toBuffer();
 ```
 
--   Throws **[Error][4]** Invalid options
+```javascript
+// Use mozjpeg to reduce output JPEG file size (slower)
+const data = await sharp(input)
+  .jpeg({ mozjpeg: true })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid options
 
 Returns **Sharp** 
 
@@ -180,34 +228,41 @@ Returns **Sharp**
 
 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.
-
-Some of these options require the use of a globally-installed libvips compiled with support for libimagequant (GPL).
+Set `palette` to `true` for slower, indexed PNG output.
 
 ### Parameters
 
--   `options` **[Object][6]?** 
-    -   `options.progressive` **[boolean][7]** use progressive (interlace) scan (optional, default `false`)
-    -   `options.compressionLevel` **[number][9]** zlib compression level, 0-9 (optional, default `9`)
-    -   `options.adaptiveFiltering` **[boolean][7]** use adaptive row filtering (optional, default `false`)
-    -   `options.palette` **[boolean][7]** quantise to a palette-based image with alpha transparency support, requires libvips compiled with support for libimagequant (optional, default `false`)
-    -   `options.quality` **[number][9]** use the lowest number of colours needed to achieve given quality, sets `palette` to `true`, requires libvips compiled with support for libimagequant (optional, default `100`)
-    -   `options.colours` **[number][9]** maximum number of palette entries, sets `palette` to `true`, requires libvips compiled with support for libimagequant (optional, default `256`)
-    -   `options.colors` **[number][9]** alternative spelling of `options.colours`, sets `palette` to `true`, requires libvips compiled with support for libimagequant (optional, default `256`)
-    -   `options.dither` **[number][9]** level of Floyd-Steinberg error diffusion, sets `palette` to `true`, requires libvips compiled with support for libimagequant (optional, default `1.0`)
-    -   `options.force` **[boolean][7]** force PNG output, otherwise attempt to use input format (optional, default `true`)
+*   `options` **[Object][6]?** 
+
+    *   `options.progressive` **[boolean][7]** use progressive (interlace) scan (optional, default `false`)
+    *   `options.compressionLevel` **[number][9]** zlib compression level, 0 (fastest, largest) to 9 (slowest, smallest) (optional, default `6`)
+    *   `options.adaptiveFiltering` **[boolean][7]** use adaptive row filtering (optional, default `false`)
+    *   `options.palette` **[boolean][7]** quantise to a palette-based image with alpha transparency support (optional, default `false`)
+    *   `options.quality` **[number][9]** use the lowest number of colours needed to achieve given quality, sets `palette` to `true` (optional, default `100`)
+    *   `options.colours` **[number][9]** maximum number of palette entries, sets `palette` to `true` (optional, default `256`)
+    *   `options.colors` **[number][9]** alternative spelling of `options.colours`, sets `palette` to `true` (optional, default `256`)
+    *   `options.dither` **[number][9]** level of Floyd-Steinberg error diffusion, sets `palette` to `true` (optional, default `1.0`)
+    *   `options.force` **[boolean][7]** 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][4]** Invalid options
+```javascript
+// Convert any input to indexed PNG output (slower)
+const data = await sharp(input)
+  .png({ palette: true })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid options
 
 Returns **Sharp** 
 
@@ -217,17 +272,18 @@ Use these WebP options for output image.
 
 ### Parameters
 
--   `options` **[Object][6]?** output options
-    -   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `80`)
-    -   `options.alphaQuality` **[number][9]** quality of alpha layer, integer 0-100 (optional, default `100`)
-    -   `options.lossless` **[boolean][7]** use lossless compression mode (optional, default `false`)
-    -   `options.nearLossless` **[boolean][7]** use near_lossless compression mode (optional, default `false`)
-    -   `options.smartSubsample` **[boolean][7]** use high quality chroma subsampling (optional, default `false`)
-    -   `options.reductionEffort` **[number][9]** level of CPU effort to reduce file size, integer 0-6 (optional, default `4`)
-    -   `options.pageHeight` **[number][9]?** page height for animated output
-    -   `options.loop` **[number][9]** number of animation iterations, use 0 for infinite animation (optional, default `0`)
-    -   `options.delay` **[Array][10]&lt;[number][9]>?** list of delays between animation frames (in milliseconds)
-    -   `options.force` **[boolean][7]** force WebP output, otherwise attempt to use input format (optional, default `true`)
+*   `options` **[Object][6]?** output options
+
+    *   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `80`)
+    *   `options.alphaQuality` **[number][9]** quality of alpha layer, integer 0-100 (optional, default `100`)
+    *   `options.lossless` **[boolean][7]** use lossless compression mode (optional, default `false`)
+    *   `options.nearLossless` **[boolean][7]** use near_lossless compression mode (optional, default `false`)
+    *   `options.smartSubsample` **[boolean][7]** use high quality chroma subsampling (optional, default `false`)
+    *   `options.reductionEffort` **[number][9]** level of CPU effort to reduce file size, integer 0-6 (optional, default `4`)
+    *   `options.pageHeight` **[number][9]?** page height for animated output
+    *   `options.loop` **[number][9]** number of animation iterations, use 0 for infinite animation (optional, default `0`)
+    *   `options.delay` **[Array][10]<[number][9]>?** list of delays between animation frames (in milliseconds)
+    *   `options.force` **[boolean][7]** force WebP output, otherwise attempt to use input format (optional, default `true`)
 
 ### Examples
 
@@ -238,7 +294,14 @@ const data = await sharp(input)
   .toBuffer();
 ```
 
--   Throws **[Error][4]** Invalid options
+```javascript
+// Optimise the file size of an animated WebP
+const outputWebp = await sharp(inputWebp, { animated: true })
+  .webp({ reductionEffort: 6 })
+  .toBuffer();
+```
+
+*   Throws **[Error][4]** Invalid options
 
 Returns **Sharp** 
 
@@ -252,14 +315,16 @@ The prebuilt binaries do not include this - see
 
 ### Parameters
 
--   `options` **[Object][6]?** output options
-    -   `options.pageHeight` **[number][9]?** page height for animated output
-    -   `options.loop` **[number][9]** number of animation iterations, use 0 for infinite animation (optional, default `0`)
-    -   `options.delay` **[Array][10]&lt;[number][9]>?** list of delays between animation frames (in milliseconds)
-    -   `options.force` **[boolean][7]** force GIF output, otherwise attempt to use input format (optional, default `true`)
+*   `options` **[Object][6]?** output options
 
+    *   `options.pageHeight` **[number][9]?** page height for animated output
+    *   `options.loop` **[number][9]** number of animation iterations, use 0 for infinite animation (optional, default `0`)
+    *   `options.delay` **[Array][10]<[number][9]>?** list of delays between animation frames (in milliseconds)
+    *   `options.force` **[boolean][7]** force GIF output, otherwise attempt to use input format (optional, default `true`)
 
--   Throws **[Error][4]** Invalid options
+<!---->
+
+*   Throws **[Error][4]** Invalid options
 
 Returns **Sharp** 
 
@@ -269,18 +334,19 @@ Use these TIFF options for output image.
 
 ### Parameters
 
--   `options` **[Object][6]?** output options
-    -   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `80`)
-    -   `options.force` **[boolean][7]** force TIFF output, otherwise attempt to use input format (optional, default `true`)
-    -   `options.compression` **[boolean][7]** compression options: lzw, deflate, jpeg, ccittfax4 (optional, default `'jpeg'`)
-    -   `options.predictor` **[boolean][7]** compression predictor options: none, horizontal, float (optional, default `'horizontal'`)
-    -   `options.pyramid` **[boolean][7]** write an image pyramid (optional, default `false`)
-    -   `options.tile` **[boolean][7]** write a tiled tiff (optional, default `false`)
-    -   `options.tileWidth` **[boolean][7]** horizontal tile size (optional, default `256`)
-    -   `options.tileHeight` **[boolean][7]** vertical tile size (optional, default `256`)
-    -   `options.xres` **[number][9]** horizontal resolution in pixels/mm (optional, default `1.0`)
-    -   `options.yres` **[number][9]** vertical resolution in pixels/mm (optional, default `1.0`)
-    -   `options.bitdepth` **[boolean][7]** reduce bitdepth to 1, 2 or 4 bit (optional, default `8`)
+*   `options` **[Object][6]?** output options
+
+    *   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `80`)
+    *   `options.force` **[boolean][7]** force TIFF output, otherwise attempt to use input format (optional, default `true`)
+    *   `options.compression` **[string][2]** compression options: lzw, deflate, jpeg, ccittfax4 (optional, default `'jpeg'`)
+    *   `options.predictor` **[string][2]** compression predictor options: none, horizontal, float (optional, default `'horizontal'`)
+    *   `options.pyramid` **[boolean][7]** write an image pyramid (optional, default `false`)
+    *   `options.tile` **[boolean][7]** write a tiled tiff (optional, default `false`)
+    *   `options.tileWidth` **[number][9]** horizontal tile size (optional, default `256`)
+    *   `options.tileHeight` **[number][9]** vertical tile size (optional, default `256`)
+    *   `options.xres` **[number][9]** horizontal resolution in pixels/mm (optional, default `1.0`)
+    *   `options.yres` **[number][9]** vertical resolution in pixels/mm (optional, default `1.0`)
+    *   `options.bitdepth` **[number][9]** reduce bitdepth to 1, 2 or 4 bit (optional, default `8`)
 
 ### Examples
 
@@ -295,36 +361,62 @@ sharp('input.svg')
   .then(info => { ... });
 ```
 
--   Throws **[Error][4]** Invalid options
+*   Throws **[Error][4]** Invalid options
 
 Returns **Sharp** 
 
-## heif
+## avif
 
-Use these HEIF options for output image.
+Use these AVIF options for output image.
 
-Support for HEIF (HEIC/AVIF) is experimental.
-Do not use this in production systems.
-
-Requires a custom, globally-installed libvips compiled with support for libheif.
-
-Most versions of libheif support only the patent-encumbered HEVC compression format.
+Whilst it is possible to create AVIF images smaller than 16x16 pixels,
+most web browsers do not display these properly.
 
 ### Parameters
 
--   `options` **[Object][6]?** output options
-    -   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `80`)
-    -   `options.compression` **[boolean][7]** compression format: hevc, avc, jpeg, av1 (optional, default `'hevc'`)
-    -   `options.lossless` **[boolean][7]** use lossless compression (optional, default `false`)
+*   `options` **[Object][6]?** output options
 
+    *   `options.quality` **[number][9]** quality, integer 1-100 (optional, default `50`)
+    *   `options.lossless` **[boolean][7]** use lossless compression (optional, default `false`)
+    *   `options.speed` **[number][9]** CPU effort vs file size, 0 (slowest/smallest) to 8 (fastest/largest) (optional, default `5`)
+    *   `options.chromaSubsampling` **[string][2]** set to '4:4:4' to prevent chroma subsampling otherwise defaults to '4:2:0' chroma subsampling, requires libvips v8.11.0 (optional, default `'4:2:0'`)
 
--   Throws **[Error][4]** Invalid options
+<!---->
+
+*   Throws **[Error][4]** Invalid options
 
 Returns **Sharp** 
 
 **Meta**
 
--   **since**: 0.23.0
+*   **since**: 0.27.0
+
+## heif
+
+Use these HEIF options for output image.
+
+Support for patent-encumbered HEIC images 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][9]** quality, integer 1-100 (optional, default `50`)
+    *   `options.compression` **[string][2]** compression format: av1, hevc (optional, default `'av1'`)
+    *   `options.lossless` **[boolean][7]** use lossless compression (optional, default `false`)
+    *   `options.speed` **[number][9]** CPU effort vs file size, 0 (slowest/smallest) to 8 (fastest/largest) (optional, default `5`)
+    *   `options.chromaSubsampling` **[string][2]** set to '4:4:4' to prevent chroma subsampling otherwise defaults to '4:2:0' chroma subsampling, requires libvips v8.11.0 (optional, default `'4:2:0'`)
+
+<!---->
+
+*   Throws **[Error][4]** Invalid options
+
+Returns **Sharp** 
+
+**Meta**
+
+*   **since**: 0.23.0
 
 ## raw
 
@@ -363,15 +455,19 @@ Warning: multiple sharp instances concurrently producing tile output can expose
 
 ### Parameters
 
--   `options` **[Object][6]?** 
-    -   `options.size` **[number][9]** tile size in pixels, a value between 1 and 8192. (optional, default `256`)
-    -   `options.overlap` **[number][9]** tile overlap in pixels, a value between 0 and 8192. (optional, default `0`)
-    -   `options.angle` **[number][9]** tile angle of rotation, must be a multiple of 90. (optional, default `0`)
-    -   `options.background` **([string][2] \| [Object][6])** background colour, parsed by the [color][12] module, defaults to white without transparency. (optional, default `{r:255,g:255,b:255,alpha:1}`)
-    -   `options.depth` **[string][2]?** how deep to make the pyramid, possible values are `onepixel`, `onetile` or `one`, default based on layout.
-    -   `options.skipBlanks` **[number][9]** 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`, `zoomify` or `google`. (optional, default `'dz'`)
+*   `options` **[Object][6]?** 
+
+    *   `options.size` **[number][9]** tile size in pixels, a value between 1 and 8192. (optional, default `256`)
+    *   `options.overlap` **[number][9]** tile overlap in pixels, a value between 0 and 8192. (optional, default `0`)
+    *   `options.angle` **[number][9]** tile angle of rotation, must be a multiple of 90. (optional, default `0`)
+    *   `options.background` **([string][2] | [Object][6])** background colour, parsed by the [color][12] module, defaults to white without transparency. (optional, default `{r:255,g:255,b:255,alpha:1}`)
+    *   `options.depth` **[string][2]?** how deep to make the pyramid, possible values are `onepixel`, `onetile` or `one`, default based on layout.
+    *   `options.skipBlanks` **[number][9]** 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`, `zoomify` or `google`. (optional, default `'dz'`)
+    *   `options.centre` **[boolean][7]** centre image in tile. (optional, default `false`)
+    *   `options.center` **[boolean][7]** alternative spelling of centre. (optional, default `false`)
+    *   `options.id` **[string][2]** when `layout` is `iiif`, sets the `@id` attribute of `info.json` (optional, default `'https://example.com/iiif'`)
 
 ### Examples
 
@@ -387,7 +483,7 @@ sharp('input.tiff')
   });
 ```
 
--   Throws **[Error][4]** Invalid parameters
+*   Throws **[Error][4]** Invalid parameters
 
 Returns **Sharp** 
 

docs/api-resize.md

@@ -6,49 +6,50 @@ Resize image to `width`, `height` or `width x height`.
 
 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.
+*   `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][1] CSS property.
 
 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.
+*   `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][2] 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][3].
--   `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
+*   `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.
 
 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).
+*   `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).
 
 ### Parameters
 
--   `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]?** 
-    -   `options.width` **[String][10]?** alternative means of specifying `width`. If both are present this take priority.
-    -   `options.height` **[String][10]?** alternative means of specifying `height`. If both are present this take 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 using a `fit` of `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.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`)
+*   `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]?** 
+
+    *   `options.width` **[String][10]?** alternative means of specifying `width`. If both are present this take priority.
+    *   `options.height` **[String][10]?** alternative means of specifying `height`. If both are present this take 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 using a `fit` of `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.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
 
@@ -125,7 +126,7 @@ const scaleByHalf = await sharp(input)
   );
 ```
 
--   Throws **[Error][13]** Invalid parameters
+*   Throws **[Error][13]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -136,12 +137,13 @@ This operation will always occur after resizing and extraction, if any.
 
 ### Parameters
 
--   `extend` **([number][8] \| [Object][9])** single pixel count to add to all edges or an Object with per-edge counts
-    -   `extend.top` **[number][8]?** 
-    -   `extend.left` **[number][8]?** 
-    -   `extend.bottom` **[number][8]?** 
-    -   `extend.right` **[number][8]?** 
-    -   `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}`)
+*   `extend` **([number][8] | [Object][9])** single pixel count to add to all edges or an Object with per-edge counts
+
+    *   `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}`)
 
 ### Examples
 
@@ -160,7 +162,17 @@ sharp(input)
   ...
 ```
 
--   Throws **[Error][13]** Invalid parameters
+```javascript
+// Add a row of 10 red pixels to the bottom
+sharp(input)
+  .extend({
+    bottom: 10,
+    background: 'red'
+  })
+  ...
+```
+
+*   Throws **[Error][13]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -168,17 +180,18 @@ Returns **Sharp**
 
 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.
+*   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][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
+*   `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
 
@@ -200,7 +213,7 @@ sharp(input)
   });
 ```
 
--   Throws **[Error][13]** Invalid parameters
+*   Throws **[Error][13]** Invalid parameters
 
 Returns **Sharp** 
 
@@ -209,14 +222,16 @@ Returns **Sharp**
 Trim "boring" pixels from all edges that contain values similar to the top-left pixel.
 Images consisting entirely of a single colour will calculate "boring" using the alpha channel, if any.
 
-The `info` response Object will contain `trimOffsetLeft` and `trimOffsetTop` properties.
+The `info` response Object, obtained from callback of `.toFile()` or `.toBuffer()`,
+will contain `trimOffsetLeft` and `trimOffsetTop` properties.
 
 ### Parameters
 
--   `threshold` **[number][8]** the allowed difference from the top-left pixel, a number greater than zero. (optional, default `10`)
+*   `threshold` **[number][8]** the allowed difference from the top-left pixel, a number greater than zero. (optional, default `10`)
 
+<!---->
 
--   Throws **[Error][13]** Invalid parameters
+*   Throws **[Error][13]** Invalid parameters
 
 Returns **Sharp** 
 

docs/api-utility.md

@@ -12,6 +12,36 @@ console.log(sharp.format);
 
 Returns **[Object][1]** 
 
+## 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.
@@ -24,17 +54,18 @@ console.log(sharp.versions);
 
 ## 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.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.items` **[number][3]** is the maximum number of operations to cache (optional, default `100`)
+*   `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][11]** is the maximum memory in MB to use for this cache (optional, default `50`)
+    *   `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
 
@@ -53,9 +84,13 @@ Returns **[Object][1]**
 ## concurrency
 
 Gets or, when a concurrency is provided, sets
-the number of threads _libvips'_ should create to process each image.
-The default value is the number of CPU cores.
-A value of `0` will reset to this default.
+the number of threads *libvips'* should create to process each image.
+
+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.
 
 The maximum number of images that can be processed in parallel
 is limited by libuv's `UV_THREADPOOL_SIZE` environment variable.
@@ -64,7 +99,7 @@ This method always returns the current concurrency.
 
 ### Parameters
 
--   `concurrency` **[number][3]?** 
+*   `concurrency` **[number][11]?** 
 
 ### Examples
 
@@ -74,14 +109,14 @@ 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
+*   queued, waiting for *libuv* to provide a worker thread
+*   complete
 
 ### Examples
 
@@ -95,8 +130,8 @@ sharp.queue.on('change', function(queueLength) {
 
 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.
--   process is the number of resize tasks currently being processed.
+*   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.
 
 ### Examples
 
@@ -116,7 +151,7 @@ by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM N
 
 ### Parameters
 
--   `simd` **[boolean][2]**  (optional, default `true`)
+*   `simd` **[boolean][10]**  (optional, default `true`)
 
 ### Examples
 
@@ -130,10 +165,26 @@ const simd = sharp.simd(false);
 // prevent libvips from using liborc at runtime
 ```
 
-Returns **[boolean][2]** 
+Returns **[boolean][10]** 
 
 [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/jcupitt/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/jcupitt/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

docs/build.js

@@ -0,0 +1,25 @@
+'use strict';
+
+const fs = require('fs').promises;
+const path = require('path');
+const documentation = require('documentation');
+
+[
+  'constructor',
+  'input',
+  'resize',
+  'composite',
+  'operation',
+  'colour',
+  'channel',
+  'output',
+  'utility'
+].forEach(async (m) => {
+  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/changelog.md

@@ -1,9 +1,166 @@
 # Changelog
 
+## v0.28 - *bijou*
+
+Requires libvips v8.10.6
+
+### v0.28.3 - 24th May 2021
+
+* Ensure presence of libvips, vendored or global, before invoking node-gyp.
+
+* Skip shrink-on-load for multi-page WebP.
+  [#2714](https://github.com/lovell/sharp/issues/2714)
+
+* Add contrast limiting adaptive histogram equalization (CLAHE) operator.
+  [#2726](https://github.com/lovell/sharp/pull/2726)
+  [@baparham](https://github.com/baparham)
+
+### v0.28.2 - 10th May 2021
+
+* Allow `withMetadata` to set `density`.
+  [#967](https://github.com/lovell/sharp/issues/967)
+
+* Skip shrink-on-load where one dimension <4px.
+  [#2653](https://github.com/lovell/sharp/issues/2653)
+
+* Allow escaped proxy credentials.
+  [#2664](https://github.com/lovell/sharp/pull/2664)
+  [@msalettes](https://github.com/msalettes)
+
+* Add `premultiplied` flag for raw pixel data input.
+  [#2685](https://github.com/lovell/sharp/pull/2685)
+  [@mnutt](https://github.com/mnutt)
+
+* Detect empty input and throw a helpful error.
+  [#2687](https://github.com/lovell/sharp/pull/2687)
+  [@JakobJingleheimer](https://github.com/JakobJingleheimer)
+
+* Add install-time flag to skip version compatibility checks.
+  [#2692](https://github.com/lovell/sharp/pull/2692)
+  [@xemle](https://github.com/xemle)
+
+### v0.28.1 - 5th April 2021
+
+* Ensure all installation errors are logged with a more obvious prefix.
+
+* Allow `withMetadata` to set and update EXIF metadata.
+  [#650](https://github.com/lovell/sharp/issues/650)
+
+* Add support for OME-TIFF Sub Image File Directories (subIFD).
+  [#2557](https://github.com/lovell/sharp/issues/2557)
+
+* Allow `ensureAlpha` to set the alpha transparency level.
+  [#2634](https://github.com/lovell/sharp/issues/2634)
+
+### v0.28.0 - 29th March 2021
+
+* Prebuilt binaries now include mozjpeg and libimagequant (BSD 2-Clause).
+
+* Prebuilt binaries limit AVIF support to the most common 8-bit depth.
+
+* Add `mozjpeg` option to `jpeg` method, sets mozjpeg defaults.
+
+* Reduce the default PNG `compressionLevel` to the more commonly used 6.
+
+* Reduce concurrency on glibc-based Linux when using the default memory allocator to help prevent fragmentation.
+
+* Default missing edge properties of extend operation to zero.
+  [#2578](https://github.com/lovell/sharp/issues/2578)
+
+* Ensure composite does not clip top and left offsets.
+  [#2594](https://github.com/lovell/sharp/pull/2594)
+  [@SHG42](https://github.com/SHG42)
+
+* Improve error handling of network failure at install time.
+  [#2608](https://github.com/lovell/sharp/pull/2608)
+  [@abradley](https://github.com/abradley)
+
+* Ensure `@id` attribute can be set for IIIF tile-based output.
+  [#2612](https://github.com/lovell/sharp/issues/2612)
+  [@edsilv](https://github.com/edsilv)
+
+* Ensure composite replicates the correct number of tiles for centred gravities.
+  [#2626](https://github.com/lovell/sharp/issues/2626)
+
+## v0.27 - *avif*
+
+Requires libvips v8.10.5
+
+### v0.27.2 - 22nd February 2021
+
+* macOS: Prevent use of globally-installed ARM64 libvips with Rosetta x64 emulation.
+  [#2460](https://github.com/lovell/sharp/issues/2460)
+
+* Linux (musl): Prevent use of prebuilt linuxmusl-x64 binaries with musl >= 1.2.0.
+  [#2570](https://github.com/lovell/sharp/issues/2570)
+
+* Improve 16-bit grey+alpha support by using libvips' `has_alpha` detection.
+  [#2569](https://github.com/lovell/sharp/issues/2569)
+
+* Allow the use of non lower case extensions with `toFormat`.
+  [#2581](https://github.com/lovell/sharp/pull/2581)
+  [@florian-busch](https://github.com/florian-busch)
+
+* Allow use of `recomb` operation with single channel input.
+  [#2584](https://github.com/lovell/sharp/issues/2584)
+
+### v0.27.1 - 27th January 2021
+
+* Ensure TIFF is cast when using float predictor.
+  [#2502](https://github.com/lovell/sharp/pull/2502)
+  [@randyridge](https://github.com/randyridge)
+
+* Add support for Uint8Array and Uint8ClampedArray input.
+  [#2511](https://github.com/lovell/sharp/pull/2511)
+  [@leon](https://github.com/leon)
+
+* Revert: ensure all platforms use fontconfig for font rendering.
+  [#2515](https://github.com/lovell/sharp/issues/2515)
+
+* Expose libvips gaussnoise operation to allow creation of Gaussian noise.
+  [#2527](https://github.com/lovell/sharp/pull/2527)
+  [@alza54](https://github.com/alza54)
+
+### v0.27.0 - 22nd December 2020
+
+* Add support for AVIF to prebuilt binaries.
+
+* Remove experimental status from `heif` output, defaults are now AVIF-centric.
+
+* Allow negative top/left offsets for composite operation.
+  [#2391](https://github.com/lovell/sharp/pull/2391)
+  [@CurosMJ](https://github.com/CurosMJ)
+
+* Ensure all platforms use fontconfig for font rendering.
+  [#2399](https://github.com/lovell/sharp/issues/2399)
+
 ## v0.26 - *zoom*
 
 Requires libvips v8.10.0
 
+### v0.26.3 - 16th November 2020
+
+* Expose libvips' affine operation.
+  [#2336](https://github.com/lovell/sharp/pull/2336)
+  [@guillevc](https://github.com/guillevc)
+
+* Fallback to tar.gz for prebuilt libvips when Brotli not available.
+  [#2412](https://github.com/lovell/sharp/pull/2412)
+  [@ascorbic](https://github.com/ascorbic)
+
+### v0.26.2 - 14th October 2020
+
+* Add support for EXR input. Requires libvips compiled with OpenEXR.
+  [#698](https://github.com/lovell/sharp/issues/698)
+
+* Ensure support for yarn v2.
+  [#2379](https://github.com/lovell/sharp/pull/2379)
+  [@jalovatt](https://github.com/jalovatt)
+
+* Add centre/center option to tile-based output.
+  [#2397](https://github.com/lovell/sharp/pull/2397)
+  [@beig](https://github.com/beig)
+
 ### v0.26.1 - 20th September 2020
 
 * Ensure correct pageHeight when verifying multi-page image dimensions.

docs/firebase.json

@@ -4,6 +4,7 @@
     "public": ".",
     "ignore": [
       ".*",
+      "build.js",
       "firebase.json",
       "*.md",
       "image/**",

docs/humans.txt

@@ -203,3 +203,12 @@ 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

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

@@ -1,5 +1,5 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="86 86 550 550">
-<!-- Copyright 2019 Lovell Fuller. This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License. -->
+<!-- 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.html

@@ -4,7 +4,7 @@
 <head>
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
-  <meta name="description" content="Resize large images in common formats to smaller, web-friendly JPEG, PNG and WebP images of varying dimensions">
+  <meta name="description" content="Resize large images in common formats to smaller, web-friendly JPEG, PNG, WebP and AVIF images of varying dimensions">
   <meta http-equiv="Content-Security-Policy" content="default-src 'self'; object-src 'none'; style-src 'unsafe-inline';
     img-src 'unsafe-inline' data: https://pixel.plumbing/px/ https://cdn.jsdelivr.net/gh/lovell/ https://www.google-analytics.com;
     connect-src 'self' https://cdn.jsdelivr.net/gh/lovell/ https://www.google-analytics.com;
@@ -19,7 +19,7 @@
   <link rel="apple-touch-icon-precomposed" sizes="72x72" href="https://pixel.plumbing/px/72x72/sharp-logo.svg">
   <link rel="apple-touch-icon-precomposed" href="https://pixel.plumbing/px/57x57/sharp-logo.svg">
   <link rel="author" href="/humans.txt" type="text/plain">
-  <link rel="preload" href="https://cdn.jsdelivr.net/gh/lovell/sharp@v0.26.1/docs/README.md" as="fetch" type="text/markdown" crossorigin>
+  <link rel="preload" href="https://cdn.jsdelivr.net/gh/lovell/sharp@v0.28.3/docs/README.md" as="fetch" type="text/markdown" crossorigin>
   <link rel="preload" href="https://cdn.jsdelivr.net/gh/lovell/sharp@master/docs/image/sharp-logo.svg" as="image" type="image/svg+xml" crossorigin>
   <link rel="dns-prefetch" href="https://pixel.plumbing">
   <link rel="dns-prefetch" href="https://www.google-analytics.com">
@@ -38,7 +38,7 @@
       "@type": "Person",
       "name": "Lovell Fuller"
     },
-    "copyrightYear": [2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020],
+    "copyrightYear": [2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021],
     "license": "https://www.apache.org/licenses/LICENSE-2.0"
   }
   </script>
@@ -139,7 +139,7 @@
         docuteApiTitlePlugin,
         docuteApiSearchPlugin
       ],
-      sourcePath: 'https://cdn.jsdelivr.net/gh/lovell/sharp@v0.26.1/docs',
+      sourcePath: 'https://cdn.jsdelivr.net/gh/lovell/sharp@v0.28.3/docs',
       nav: [
         {
           title: 'Funding',

docs/install.md

@@ -10,34 +10,37 @@ yarn add sharp
 
 ## Prerequisites
 
-* Node.js v10.16.0+
+* Node.js v10+
 
 ## Prebuilt binaries
 
 Ready-compiled sharp and libvips binaries are provided for use with
-Node.js v10.16.0+ on the most common platforms:
+Node.js v10+ on the most common platforms:
 
 * macOS x64 (>= 10.13)
 * Linux x64 (glibc >= 2.17, musl >= 1.1.24)
-* Linux ARM64 (glibc >= 2.29)
-* Windows
+* Linux ARM64 (glibc >= 2.29, musl >= 1.1.24)
+* Windows x64
+* Windows x86
 
-A ~7MB tarball containing libvips and its most commonly used dependencies
+An ~7.5MB tarball containing libvips and its most commonly used dependencies
 is downloaded via HTTPS and stored within `node_modules/sharp/vendor` during `npm install`.
 
 This provides support for the
-JPEG, PNG, WebP, TIFF, GIF (input) and SVG (input) image formats.
+JPEG, PNG, WebP, AVIF, TIFF, GIF (input) and SVG (input) image formats.
 
 The following platforms have prebuilt libvips but not sharp:
 
+* macOS ARM64
 * Linux ARMv6
 * Linux ARMv7 (glibc >= 2.28)
+* Windows ARM64
 
 The following platforms require compilation of both libvips and sharp from source:
 
 * Linux x86
 * Linux x64 (glibc <= 2.16, includes RHEL/CentOS 6)
-* Linux ARM64 (glibc <= 2.28, musl)
+* Linux ARM64 (glibc <= 2.28)
 * Linux PowerPC
 * FreeBSD
 * OpenBSD
@@ -46,13 +49,55 @@ The following platforms require compilation of both libvips and sharp from sourc
 
 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.
 
-The `npm install --unsafe-perm` flag must be used when installing as `root` or a `sudo` user.
+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, 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 sharp` for useful error messages.
 
+## Apple M1
+
+Prebuilt libvips binaries are provided for macOS on ARM64 (since sharp v0.28.0).
+
+During `npm install` sharp will be built locally,
+which requires Xcode and Python - see
+[building from source](#building-from-source).
+
+When this new ARM64 CPU is made freely available
+to open source projects via a CI service
+then prebuilt sharp binaries can also be provided.
+
+## 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`, `linuxmusl`, `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`).
+* `--sharp-install-force`: skip version compatibility checks.
+
+These values can also be set via environment variables,
+`npm_config_platform`, `npm_config_arch`, `npm_config_arm_version`
+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=linuxmusl sharp
+```
+
 ## Custom libvips
 
 To use a custom, globally-installed version of libvips instead of the provided binaries,
@@ -69,7 +114,7 @@ The use of a globally-installed libvips is unsupported on Windows.
 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 binaries do not exist for the current platform and Node.js version, or
+* 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:
@@ -85,21 +130,28 @@ To install the prebuilt sharp binaries from a custom URL,
 set the `sharp_binary_host` npm config option
 or the `npm_config_sharp_binary_host` environment variable.
 
+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.
+
 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.
 
-The version subpath and file name are appended to these.
+The version subpath and file name are appended to these. There should be tarballs available
+that are compressed with both gzip and Brotli, as the format downloaded will vary depending
+on whether the user's version of Node supports Brotli decompression (Node.js v10.16.0+)
 
 For example, if `sharp_libvips_binary_host` is set to `https://hostname/path`
 and the libvips version is `1.2.3` then the resultant URL will be
-`https://hostname/path/v1.2.3/libvips-1.2.3-platform-arch.tar.br`.
+`https://hostname/path/v1.2.3/libvips-1.2.3-platform-arch.tar.br` or 
+`https://hostname/path/v1.2.3/libvips-1.2.3-platform-arch.tar.gz`.
 
 See the Chinese mirror below for a further example.
 
 ## Chinese mirror
 
-Alibaba provide a mirror site based in China containing binaries for both sharp and libvips.
+A mirror site based in China, provided by Alibaba, contains binaries for both sharp and libvips.
 
 To use this either set the following configuration:
 
@@ -129,6 +181,23 @@ pkg install -y pkgconf vips
 cd /usr/ports/graphics/vips/ && make install clean
 ```
 
+## Linux memory allocator
+
+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.
+
+For this reason, by default, sharp will limit the use of thread-based
+[concurrency](api-utility#concurrency) when the glibc allocator is
+detected at runtime.
+
+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
@@ -141,16 +210,22 @@ to `false` when using the `yarn` package manager.
 
 ## AWS Lambda
 
-Set the Lambda runtime to `nodejs12.x`.
-
 The binaries in the `node_modules` directory of the
 [deployment package](https://docs.aws.amazon.com/lambda/latest/dg/nodejs-package.html)
 must be for the Linux x64 platform.
 
-On machines other than Linux x64, such as macOS and Windows, run the following:
+When building your deployment package on machines other than Linux x64 (glibc),
+run the following commands:
 
+macOS:
 ```sh
 rm -rf node_modules/sharp
+SHARP_IGNORE_GLOBAL_LIBVIPS=1 npm install --arch=x64 --platform=linux sharp
+```
+
+Windows:
+```sh
+rmdir /s /q node_modules/sharp
 npm install --arch=x64 --platform=linux sharp
 ```
 
@@ -164,23 +239,34 @@ docker run -v "$PWD":/var/task lambci/lambda:build-nodejs12.x npm install sharp
 To get the best performance select the largest memory available.
 A 1536 MB function provides ~12x more CPU time than a 128 MB function.
 
-## Electron
+## Webpack
 
-Electron provides versions of the V8 JavaScript engine
-that are incompatible with Node.js.
-To ensure the correct binaries are used, run the following:
+Ensure sharp is added to the
+[externals](https://webpack.js.org/configuration/externals/)
+configuration.
 
-```sh
-npm install
-npx electron-rebuild
+```js
+externals: {
+  'sharp': 'commonjs sharp'
+}
 ```
 
-Further help can be found at
-[https://electronjs.org/docs/tutorial/using-native-node-modules](https://electronjs.org/docs/tutorial/using-native-node-modules)
-
 ## Worker threads
 
 The main thread must call `require('sharp')`
 before worker threads are created
 to ensure shared libraries remain loaded in memory
 until after all threads are complete.
+
+## Known conflicts
+
+### Canvas and Windows
+
+The prebuilt binaries provided by `canvas` for Windows depend on the unmaintained GTK 2, last updated in 2011.
+
+These conflict with the modern, up-to-date binaries provided by sharp.
+
+If both modules are used in the same Windows process, the following error will occur:
+```
+The specified procedure could not be found.
+```

docs/performance.md

@@ -4,11 +4,11 @@ A test to benchmark the performance of this module relative to alternatives.
 
 ## The contenders
 
-* [jimp](https://www.npmjs.com/package/jimp) v0.16.0 - Image processing in pure JavaScript. Provides bicubic interpolation.
-* [mapnik](https://www.npmjs.org/package/mapnik) v4.5.2 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
+* [jimp](https://www.npmjs.com/package/jimp) v0.16.1 - Image processing in pure JavaScript. Provides bicubic interpolation.
+* [mapnik](https://www.npmjs.org/package/mapnik) v4.5.6 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
 * [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.
-* sharp v0.26.0 / libvips v8.10.0 - Caching within libvips disabled to ensure a fair comparison.
+* sharp v0.28.0 / libvips v8.10.6 - Caching within libvips disabled to ensure a fair comparison.
 
 ## The task
 
@@ -18,25 +18,25 @@ then compress to JPEG at a "quality" setting of 80.
 
 ## Test environment
 
-* AWS EC2 eu-west-1 [c5d.large](https://aws.amazon.com/ec2/instance-types/c5/) (2x Xeon Platinum 8124M CPU @ 3.00GHz)
-* Ubuntu 20.04 (ami-0f1d11c92a9467c07)
-* Node.js v14.8.0
+* AWS EC2 eu-west-1 [c5ad.xlarge](https://aws.amazon.com/ec2/instance-types/c5/) (4x AMD EPYC 7R32)
+* Ubuntu 20.10 (ami-03f10415e8b0bfb86)
+* Node.js v14.16.0
 
 ## Results
 
 | Module             | Input  | Output | Ops/sec | Speed-up |
 | :----------------- | :----- | :----- | ------: | -------: |
-| jimp               | buffer | buffer |    0.75 |      1.0 |
-| mapnik             | buffer | buffer |    3.00 |      4.0 |
-| gm                 | buffer | buffer |    4.12 |      5.5 |
-| gm                 | file   | file   |    4.13 |      5.5 |
-| imagemagick        | file   | file   |    4.30 |      5.7 |
-| sharp              | stream | stream |   22.37 |     29.8 |
-| sharp              | file   | file   |   23.40 |     31.2 |
-| sharp              | buffer | buffer |   24.01 |     32.0 |
+| jimp               | buffer | buffer |    0.78 |      1.0 |
+| mapnik             | buffer | buffer |    3.39 |      4.3 |
+| gm                 | buffer | buffer |    7.84 |     10.1 |
+| gm                 | file   | file   |    9.24 |     11.8 |
+| imagemagick        | file   | file   |    9.37 |     12.0 |
+| sharp              | stream | stream |   26.84 |     34.4 |
+| sharp              | file   | file   |   29.76 |     38.2 |
+| sharp              | buffer | buffer |   31.60 |     40.5 |
 
 Greater libvips performance can be expected with caching enabled (default)
-and using 4+ core machines, especially those with larger L1/L2 CPU caches.
+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.
 
@@ -51,7 +51,7 @@ brew install mapnik
 ```
 
 ```sh
-sudo apt-get install imagemagick libmagick++-dev graphicsmagick libmapnik-dev
+sudo apt-get install build-essential imagemagick libmagick++-dev graphicsmagick libmapnik-dev
 ```
 
 ```sh
@@ -61,7 +61,7 @@ sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick mapnik-d
 ```sh
 git clone https://github.com/lovell/sharp.git
 cd sharp
-npm install
+npm install --build-from-source
 cd test/bench
 npm install
 npm test

docs/search-index/build.js

@@ -1,14 +1,15 @@
 'use strict';
 
 const fs = require('fs');
-const { extractDescription, extractKeywords } = require('./extract');
+const path = require('path');
+const { extractDescription, extractKeywords, extractParameters } = require('./extract');
 
 const searchIndex = [];
 
 // Install
-const contents = fs.readFileSync(`${__dirname}/../install.md`, 'utf8');
+const contents = fs.readFileSync(path.join(__dirname, '..', 'install.md'), 'utf8');
 const matches = contents.matchAll(
-  /## (?<title>[A-Za-z ]+)\n\n(?<body>[^#]+)/gs
+  /## (?<title>[A-Za-z0-9 ]+)\n\n(?<body>[^#]+)/gs
 );
 for (const match of matches) {
   const { title, body } = match.groups;
@@ -34,26 +35,27 @@ for (const match of matches) {
   'colour',
   'utility'
 ].forEach((section) => {
-  const contents = fs.readFileSync(`${__dirname}/../api-${section}.md`, 'utf8');
+  const contents = fs.readFileSync(path.join(__dirname, '..', `api-${section}.md`), 'utf8');
   const matches = contents.matchAll(
-    /\n## (?<title>[A-Za-z]+)\n\n(?<firstparagraph>.+?)\n\n/gs
+    /\n## (?<title>[A-Za-z]+)\n\n(?<firstparagraph>.+?)\n\n(?<parameters>### Parameters.+?Returns)?/gs
   );
   for (const match of matches) {
-    const { title, firstparagraph } = match.groups;
+    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} ${description}`),
+      k: extractKeywords(`${title} ${description} ${parameterNames}`),
       l: `/api-${section}#${title.toLowerCase()}`
     });
   }
 });
 
 fs.writeFileSync(
-  `${__dirname}/../search-index.json`,
+  path.join(__dirname, '..', 'search-index.json'),
   JSON.stringify(searchIndex)
 );

docs/search-index/extract.js

@@ -1,80 +1,30 @@
 'use strict';
 
-const stopWords = [
-  'a',
-  'about',
-  'all',
-  'already',
-  'always',
-  'an',
-  'and',
-  'any',
-  'are',
-  'as',
-  'at',
-  'be',
-  'been',
-  'by',
-  'can',
-  'do',
-  'does',
-  'each',
-  'either',
-  'etc',
-  'for',
-  'from',
-  'get',
-  'gets',
-  'has',
-  'have',
-  'how',
-  'if',
-  'in',
-  'is',
-  'it',
-  'its',
-  'may',
-  'more',
-  'much',
-  'no',
-  'not',
-  'of',
-  'on',
-  'or',
-  'over',
-  'set',
-  'sets',
-  'should',
-  'that',
-  'the',
-  'their',
-  'there',
-  'therefore',
-  'these',
-  'this',
-  'to',
-  'use',
-  'using',
-  'when',
-  'which',
-  'will',
-  'with'
-];
+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, ' ')
-    .substr(0, 140)
+    .substr(0, 180)
     .trim();
 
-const extractKeywords = (str) =>
-  str
-    .split(/[ -/]/)
-    .map((word) => word.toLowerCase().replace(/[^a-z]/g, ''))
-    .filter((word) => word.length > 2 && !stopWords.includes(word))
+const extractParameters = (str) =>
+  [...str.matchAll(/options\.(?<name>[^.`]+)/gs)]
+    .map((match) => match.groups.name)
     .join(' ');
 
-module.exports = { extractDescription, extractKeywords };
+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 +1,100 @@
+'use strict';
+
+module.exports = [
+  'about',
+  'after',
+  'all',
+  'allows',
+  'already',
+  'also',
+  'alternative',
+  'always',
+  'and',
+  'any',
+  'are',
+  'based',
+  'been',
+  'before',
+  'both',
+  'call',
+  'callback',
+  'can',
+  'containing',
+  'default',
+  'does',
+  'each',
+  'either',
+  'ensure',
+  'etc',
+  'every',
+  'except',
+  'for',
+  'from',
+  'get',
+  'gets',
+  'given',
+  'has',
+  'have',
+  'how',
+  'image',
+  'involve',
+  'its',
+  'least',
+  'lots',
+  'may',
+  'more',
+  'most',
+  'much',
+  'must',
+  'non',
+  'not',
+  'occur',
+  'occurs',
+  'options',
+  'other',
+  'out',
+  'over',
+  'perform',
+  'performs',
+  'provide',
+  'provided',
+  'ready',
+  'requires',
+  'returned',
+  'same',
+  'see',
+  'set',
+  'sets',
+  'should',
+  'since',
+  'spelling',
+  'such',
+  'support',
+  'supported',
+  'sure',
+  'take',
+  'than',
+  'that',
+  'the',
+  'their',
+  'then',
+  'there',
+  'therefore',
+  'these',
+  'this',
+  'under',
+  'unless',
+  'until',
+  'use',
+  'used',
+  'using',
+  'value',
+  'values',
+  'when',
+  'which',
+  'while',
+  'will',
+  'with',
+  'without',
+  'you'
+];

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

@@ -4,7 +4,6 @@ const fs = require('fs');
 const path = require('path');
 
 const libvips = require('../lib/libvips');
-const npmLog = require('npmlog');
 
 const minimumLibvipsVersion = libvips.minimumLibvipsVersion;
 
@@ -12,13 +11,13 @@ const platform = process.env.npm_config_platform || process.platform;
 if (platform === 'win32') {
   const buildDir = path.join(__dirname, '..', 'build');
   const buildReleaseDir = path.join(buildDir, 'Release');
-  npmLog.info('sharp', `Creating ${buildReleaseDir}`);
+  libvips.log(`Creating ${buildReleaseDir}`);
   try {
     libvips.mkdirSync(buildDir);
     libvips.mkdirSync(buildReleaseDir);
   } catch (err) {}
   const vendorLibDir = path.join(__dirname, '..', 'vendor', minimumLibvipsVersion, 'lib');
-  npmLog.info('sharp', `Copying DLLs from ${vendorLibDir} to ${buildReleaseDir}`);
+  libvips.log(`Copying DLLs from ${vendorLibDir} to ${buildReleaseDir}`);
   try {
     fs
       .readdirSync(vendorLibDir)
@@ -32,6 +31,7 @@ if (platform === 'win32') {
         );
       });
   } catch (err) {
-    npmLog.error('sharp', err.message);
+    libvips.log(err);
+    process.exit(1);
   }
 }

install/libvips.js

@@ -7,8 +7,8 @@ const stream = require('stream');
 const zlib = require('zlib');
 
 const detectLibc = require('detect-libc');
-const npmLog = require('npmlog');
-const semver = require('semver');
+const semverLessThan = require('semver/functions/lt');
+const semverSatisfies = require('semver/functions/satisfies');
 const simpleGet = require('simple-get');
 const tarFs = require('tar-fs');
 
@@ -22,33 +22,58 @@ const minimumGlibcVersionByArch = {
   x64: '2.17'
 };
 
+const hasSharpPrebuild = [
+  'darwin-x64',
+  'linux-arm64',
+  'linux-x64',
+  'linuxmusl-x64',
+  'linuxmusl-arm64',
+  'win32-ia32',
+  'win32-x64'
+];
+
 const { minimumLibvipsVersion, minimumLibvipsVersionLabelled } = libvips;
 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 supportsBrotli = ('BrotliDecompress' in zlib);
+const installationForced = !!(process.env.npm_config_sharp_install_force || process.env.SHARP_INSTALL_FORCE);
 
 const fail = function (err) {
-  npmLog.error('sharp', err.message);
+  libvips.log(err);
   if (err.code === 'EACCES') {
-    npmLog.info('sharp', 'Are you trying to install as a root or sudo user? Try again with the --unsafe-perm flag');
+    libvips.log('Are you trying to install as a root or sudo user? Try again with the --unsafe-perm flag');
   }
-  npmLog.info('sharp', 'Attempting to build from source via node-gyp but this may fail due to the above error');
-  npmLog.info('sharp', 'Please see https://sharp.pixelplumbing.com/install for required dependencies');
+  libvips.log('Please see https://sharp.pixelplumbing.com/install for required dependencies');
   process.exit(1);
 };
 
-const extractTarball = function (tarPath) {
+const handleError = function (err) {
+  if (installationForced) {
+    libvips.log(`Installation warning: ${err.message}`);
+  } else {
+    throw err;
+  }
+};
+
+const extractTarball = function (tarPath, platformAndArch) {
   const vendorPath = path.join(__dirname, '..', 'vendor');
   libvips.mkdirSync(vendorPath);
   const versionedVendorPath = path.join(vendorPath, minimumLibvipsVersion);
   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),
-    new zlib.BrotliDecompress(),
-    tarFs.extract(versionedVendorPath),
+    supportsBrotli ? new zlib.BrotliDecompress() : new zlib.Gunzip(),
+    tarFs.extract(versionedVendorPath, { ignore }),
     function (err) {
       if (err) {
         if (/unexpected end of file/.test(err.message)) {
-          npmLog.error('sharp', `Please delete ${tarPath} as it is not a valid tarball`);
+          fail(new Error(`Please delete ${tarPath} as it is not a valid tarball`));
         }
         fail(err);
       }
@@ -58,13 +83,14 @@ const extractTarball = function (tarPath) {
 
 try {
   const useGlobalLibvips = libvips.useGlobalLibvips();
+
   if (useGlobalLibvips) {
     const globalLibvipsVersion = libvips.globalLibvipsVersion();
-    npmLog.info('sharp', `Detected globally-installed libvips v${globalLibvipsVersion}`);
-    npmLog.info('sharp', 'Building from source via node-gyp');
+    libvips.log(`Detected globally-installed libvips v${globalLibvipsVersion}`);
+    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;
@@ -72,28 +98,40 @@ try {
     if (arch === 'ia32' && !platformAndArch.startsWith('win32')) {
       throw new Error(`Intel Architecture 32-bit systems require manual installation of libvips >= ${minimumLibvipsVersion}`);
     }
+    if (platformAndArch === 'darwin-arm64') {
+      throw new Error("Please run 'brew install vips' to install libvips on Apple M1 (ARM64) systems");
+    }
     if (platformAndArch === 'freebsd-x64' || platformAndArch === 'openbsd-x64' || platformAndArch === 'sunos-x64') {
       throw new Error(`BSD/SunOS systems require manual installation of libvips >= ${minimumLibvipsVersion}`);
     }
-    if (detectLibc.family === detectLibc.GLIBC && detectLibc.version) {
-      if (semver.lt(`${detectLibc.version}.0`, `${minimumGlibcVersionByArch[arch]}.0`)) {
-        throw new Error(`Use with glibc ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`);
+    // Linux libc version check
+    if (detectLibc.family === detectLibc.GLIBC && detectLibc.version && minimumGlibcVersionByArch[arch]) {
+      if (semverLessThan(`${detectLibc.version}.0`, `${minimumGlibcVersionByArch[arch]}.0`)) {
+        handleError(new Error(`Use with glibc ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`));
       }
     }
-    if (!semver.satisfies(process.versions.node, process.env.npm_package_engines_node)) {
-      throw new Error(`Expected Node.js version ${process.env.npm_package_engines_node} but found ${process.versions.node}`);
+    if (detectLibc.family === detectLibc.MUSL && detectLibc.version) {
+      if (semverLessThan(detectLibc.version, '1.1.24')) {
+        handleError(new Error(`Use with musl ${detectLibc.version} 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}`));
+    }
+
+    const extension = supportsBrotli ? 'br' : 'gz';
+
     // Download to per-process temporary file
-    const tarFilename = ['libvips', minimumLibvipsVersion, platformAndArch].join('-') + '.tar.br';
+    const tarFilename = ['libvips', minimumLibvipsVersion, platformAndArch].join('-') + '.tar.' + extension;
     const tarPathCache = path.join(libvips.cachePath(), tarFilename);
     if (fs.existsSync(tarPathCache)) {
-      npmLog.info('sharp', `Using cached ${tarPathCache}`);
-      extractTarball(tarPathCache);
+      libvips.log(`Using cached ${tarPathCache}`);
+      extractTarball(tarPathCache, platformAndArch);
     } else {
-      const tarPathTemp = path.join(os.tmpdir(), `${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) {
         if (err) {
           fail(err);
@@ -102,24 +140,39 @@ try {
         } 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', fail)
-            .pipe(tmpFile);
+            .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);
+            });
         }
       });
-      tmpFile
-        .on('error', fail)
-        .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);
-        });
     }
   }
 } catch (err) {

install/prebuild-ci.js

@@ -1,12 +0,0 @@
-'use strict';
-
-const { spawnSync } = require('child_process');
-
-const { prebuild_upload: hasToken, APPVEYOR_REPO_TAG_NAME, TRAVIS_TAG } = process.env;
-
-if (hasToken && (APPVEYOR_REPO_TAG_NAME || TRAVIS_TAG)) {
-  spawnSync('node',
-    ['./node_modules/prebuild/bin.js', '--runtime', 'napi', '--target', '3'],
-    { shell: true, stdio: 'inherit' }
-  );
-}

lib/agent.js

@@ -25,7 +25,7 @@ module.exports = function () {
       ? tunnelAgent.httpsOverHttps
       : tunnelAgent.httpsOverHttp;
     const proxyAuth = proxy.username && proxy.password
-      ? `${proxy.username}:${proxy.password}`
+      ? `${decodeURIComponent(proxy.username)}:${decodeURIComponent(proxy.password)}`
       : null;
     return tunnel({
       proxy: {

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()
@@ -30,21 +32,39 @@ function removeAlpha () {
 }
 
 /**
- * Ensure alpha channel, if missing. The added alpha channel will be fully opaque. This is a no-op if the image already has an alpha channel.
+ * 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
- * sharp('rgb.jpg')
+ * // rgba.png will be a 4 channel image with a fully-opaque alpha channel
+ * await sharp('rgb.jpg')
  *   .ensureAlpha()
- *   .toFile('rgba.png', function(err, info) {
- *     // rgba.png is a 4 channel image with a fully opaque alpha channel
- *   });
+ *   .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 () {
-  this.options.ensureAlpha = true;
+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;
 }
 
@@ -85,7 +105,7 @@ 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).

lib/colour.js

@@ -57,6 +57,13 @@ function grayscale (grayscale) {
 /**
  * Set the output colourspace.
  * By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
+ *
+ * @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/master/libvips/iofuncs/enumtypes.c#L568)
  * @returns {Sharp}
  * @throws {Error} Invalid parameters

lib/composite.js

@@ -89,6 +89,8 @@ const blend = {
  * @param {Number} [images[].raw.width]
  * @param {Number} [images[].raw.height]
  * @param {Number} [images[].raw.channels]
+ * @param {boolean} [images[].failOnError=true] - @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
  */
@@ -105,8 +107,9 @@ function composite (images) {
       input: this._createInputDescriptor(image.input, inputOptions, { allowStream: false }),
       blend: 'over',
       tile: false,
-      left: -1,
-      top: -1,
+      left: 0,
+      top: 0,
+      hasOffset: false,
       gravity: 0,
       premultiplied: false
     };
@@ -125,21 +128,23 @@ function composite (images) {
       }
     }
     if (is.defined(image.left)) {
-      if (is.integer(image.left) && image.left >= 0) {
+      if (is.integer(image.left)) {
         composite.left = image.left;
       } else {
-        throw is.invalidParameterError('left', 'positive integer', image.left);
+        throw is.invalidParameterError('left', 'integer', image.left);
       }
     }
     if (is.defined(image.top)) {
-      if (is.integer(image.top) && image.top >= 0) {
+      if (is.integer(image.top)) {
         composite.top = image.top;
       } else {
-        throw is.invalidParameterError('top', 'positive integer', image.top);
+        throw is.invalidParameterError('top', 'integer', image.top);
       }
     }
-    if (composite.left !== composite.top && Math.min(composite.left, composite.top) === -1) {
+    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)) {

lib/constructor.js

@@ -18,12 +18,10 @@ try {
     help.push(`- Ensure "${process.platform}" is used at install time as well as runtime`);
   } else if (/dylib/.test(err.message) && /Incompatible library version/.test(err.message)) {
     help.push('- Run "brew update && brew upgrade vips"');
-  } else if (/Cannot find module/.test(err.message)) {
-    help.push('- Run "npm rebuild --verbose sharp" and look for errors');
   } else {
     help.push(
       '- Remove the "node_modules/sharp" directory then run',
-      '  "npm install --ignore-scripts=false --verbose" and look for errors'
+      '  "npm install --ignore-scripts=false --verbose sharp" and look for errors'
     );
   }
   help.push(
@@ -40,7 +38,7 @@ const debuglog = util.debuglog('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, 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.
@@ -90,10 +88,39 @@ const debuglog = util.debuglog('sharp');
  * // Convert an animated GIF to an animated WebP
  * await sharp('in.gif', { animated: true }).toFile('out.webp');
  *
- * @param {(Buffer|string)} [input] - if present, can be
- *  a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
- *  a String containing the filesystem path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file.
- *  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');
+ *
+ * @param {(Buffer|Uint8Array|Uint8ClampedArray|string)} [input] - if present, can be
+ *  a Buffer / Uint8Array / Uint8ClampedArray containing JPEG, PNG, WebP, AVIF, GIF, SVG, TIFF or 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=true] - by default halt processing and raise an error when loading invalid images.
  *  Set this flag to `false` if you'd rather apply a "best effort" to decode images, even if the data is corrupt or invalid.
@@ -103,19 +130,26 @@ const debuglog = util.debuglog('sharp');
  * @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, TIFF, PDF), use -1 for all pages.
- * @param {number} [options.page=0] - page number to start extracting from for multi-page input (GIF, TIFF, PDF), zero based.
+ * @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.height]
- * @param {number} [options.raw.channels] - 1-4
+ * @param {number} [options.raw.width] - integral number of pixels wide.
+ * @param {number} [options.raw.height] - integral number of pixels high.
+ * @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.height]
- * @param {number} [options.create.channels] - 3-4
+ * @param {number} [options.create.width] - integral number of pixels wide.
+ * @param {number} [options.create.height] - integral number of pixels high.
+ * @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 {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.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -155,6 +189,13 @@ const Sharp = function (input, options) {
     extendRight: 0,
     extendBackground: [0, 0, 0, 255],
     withoutEnlargement: 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
@@ -175,6 +216,9 @@ const Sharp = function (input, options) {
     gammaOut: 0,
     greyscale: false,
     normalise: false,
+    claheWidth: 0,
+    claheHeight: 0,
+    claheMaxSlope: 3,
     brightness: 1,
     saturation: 1,
     hue: 0,
@@ -183,7 +227,7 @@ const Sharp = function (input, options) {
     joinChannelIn: [],
     extractChannel: -1,
     removeAlpha: false,
-    ensureAlpha: false,
+    ensureAlpha: -1,
     colourspace: 'srgb',
     composite: [],
     // output
@@ -192,7 +236,9 @@ const Sharp = function (input, options) {
     streamOut: false,
     withMetadata: false,
     withMetadataOrientation: -1,
+    withMetadataDensity: 0,
     withMetadataIcc: '',
+    withMetadataStrs: {},
     resolveWithObject: false,
     // output format
     jpegQuality: 80,
@@ -204,7 +250,7 @@ const Sharp = function (input, options) {
     jpegOptimiseCoding: true,
     jpegQuantisationTable: 0,
     pngProgressive: false,
-    pngCompressionLevel: 9,
+    pngCompressionLevel: 6,
     pngAdaptiveFiltering: false,
     pngPalette: false,
     pngQuality: 100,
@@ -226,9 +272,11 @@ const Sharp = function (input, options) {
     tiffTileWidth: 256,
     tiffXres: 1.0,
     tiffYres: 1.0,
-    heifQuality: 80,
+    heifQuality: 50,
     heifLossless: false,
-    heifCompression: 'hevc',
+    heifCompression: 'av1',
+    heifSpeed: 5,
+    heifChromaSubsampling: '4:2:0',
     tileSize: 256,
     tileOverlap: 0,
     tileContainer: 'fs',
@@ -238,6 +286,8 @@ const Sharp = function (input, options) {
     tileAngle: 0,
     tileSkipBlanks: -1,
     tileBackground: [255, 255, 255, 255],
+    tileCentre: false,
+    tileId: 'https://example.com/iiif',
     linearA: 1,
     linearB: 0,
     // Function to notify of libvips warnings

lib/input.js

@@ -9,9 +9,9 @@ const sharp = require('../build/Release/sharp.node');
  * @private
  */
 function _inputOptionsFromObject (obj) {
-  const { raw, density, limitInputPixels, sequentialRead, failOnError, animated, page, pages } = obj;
-  return [raw, density, limitInputPixels, sequentialRead, failOnError, animated, page, pages].some(is.defined)
-    ? { raw, density, limitInputPixels, sequentialRead, failOnError, animated, page, pages }
+  const { raw, density, limitInputPixels, sequentialRead, failOnError, animated, page, pages, subifd } = obj;
+  return [raw, density, limitInputPixels, sequentialRead, failOnError, animated, page, pages, subifd].some(is.defined)
+    ? { raw, density, limitInputPixels, sequentialRead, failOnError, animated, page, pages, subifd }
     : undefined;
 }
 
@@ -30,7 +30,16 @@ function _createInputDescriptor (input, inputOptions, containerOptions) {
     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.uint8Array(input)) {
+    // Uint8Array or Uint8ClampedArray
+    if (input.length === 0) {
+      throw Error('Input Bit Array is empty');
+    }
+    inputDescriptor.buffer = Buffer.from(input.buffer);
   } else if (is.plainObject(input) && !is.defined(inputOptions)) {
     // Plain Object descriptor, e.g. create
     inputOptions = input;
@@ -94,6 +103,7 @@ 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;
       } else {
         throw new Error('Expected width, height and channels for raw pixel input');
       }
@@ -128,28 +138,64 @@ function _createInputDescriptor (input, inputOptions, containerOptions) {
         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
     if (is.defined(inputOptions.create)) {
       if (
         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.defined(inputOptions.create.background)
+        is.integer(inputOptions.create.channels)
       ) {
         inputDescriptor.createWidth = inputOptions.create.width;
         inputDescriptor.createHeight = inputOptions.create.height;
         inputDescriptor.createChannels = inputOptions.create.channels;
-        const background = color(inputOptions.create.background);
-        inputDescriptor.createBackground = [
-          background.red(),
-          background.green(),
-          background.blue(),
-          Math.round(background.alpha() * 255)
-        ];
+        // Noise
+        if (is.defined(inputOptions.create.noise)) {
+          if (!is.object(inputOptions.create.noise)) {
+            throw new Error('Expected noise to be an object');
+          }
+          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');
       }
     }
   } else if (is.defined(inputOptions)) {
@@ -224,6 +270,7 @@ function _isStreamInput () {
  * - `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
  * - `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

lib/is.js

@@ -48,6 +48,15 @@ const buffer = function (val) {
   return val instanceof Buffer;
 };
 
+/**
+ * Is this value a Uint8Array or Uint8ClampedArray object?
+ * @private
+ */
+const uint8Array = function (val) {
+  // allow both since Uint8ClampedArray simply clamps the values between 0-255
+  return val instanceof Uint8Array || val instanceof Uint8ClampedArray;
+};
+
 /**
  * Is this value a non-empty string?
  * @private
@@ -110,6 +119,7 @@ module.exports = {
   fn: fn,
   bool: bool,
   buffer: buffer,
+  uint8Array: uint8Array,
   string: string,
   number: number,
   integer: integer,

lib/libvips.js

@@ -4,13 +4,15 @@ 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 env = process.env;
 const minimumLibvipsVersionLabelled = env.npm_package_config_libvips || /* istanbul ignore next */
   require('../package.json').config.libvips;
-const minimumLibvipsVersion = semver.coerce(minimumLibvipsVersionLabelled).version;
+const minimumLibvipsVersion = semverCoerce(minimumLibvipsVersionLabelled).version;
 
 const spawnSyncOptions = {
   encoding: 'utf8',
@@ -37,10 +39,28 @@ const cachePath = function () {
   return libvipsCachePath;
 };
 
+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 || '';
-    return globalLibvipsVersion.trim();
+    const globalLibvipsVersion = spawnSync(`PKG_CONFIG_PATH="${pkgConfigPath()}" pkg-config --modversion vips-cpp`, spawnSyncOptions).stdout;
+    /* istanbul ignore next */
+    return (globalLibvipsVersion || '').trim();
   } else {
     return '';
   }
@@ -81,16 +101,20 @@ 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 && /* istanbul ignore next */
-    semver.gte(globalVipsVersion, minimumLibvipsVersion);
+    semverGreaterThanOrEqualTo(globalVipsVersion, minimumLibvipsVersion);
 };
 
 module.exports = {
   minimumLibvipsVersion,
   minimumLibvipsVersionLabelled,
   cachePath,
+  log,
   globalLibvipsVersion,
   hasVendoredLibvips,
   pkgConfigPath,

lib/operation.js

@@ -82,6 +82,103 @@ function flop (flop) {
   return this;
 }
 
+/**
+ * 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.
+ *
+ * @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 affine (matrix, options) {
+  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.
@@ -171,7 +268,15 @@ function blur (sigma) {
 }
 
 /**
- * Merge alpha transparency channel, if any, with a background.
+ * Merge alpha transparency channel, if any, with a background, then remove the alpha channel.
+ *
+ * See also {@link /api-channel#removealpha|removeAlpha}.
+ *
+ * @example
+ * await sharp(rgbaInput)
+ *   .flatten({ background: '#F0A703' })
+ *   .toBuffer();
+ *
  * @param {Object} [options]
  * @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.
  * @returns {Sharp}
@@ -247,6 +352,47 @@ 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
+ *
+ * @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.
  *
@@ -265,7 +411,7 @@ function normalize (normalize) {
  *
  * @param {Object} kernel
  * @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 {number} [kernel.scale=sum] - the scale of the kernel in pixels.
  * @param {number} [kernel.offset=0] - the offset of the kernel in pixels.
@@ -299,7 +445,7 @@ 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 {Object} [options]
  * @param {Boolean} [options.greyscale=true] - convert to single channel greyscale.
@@ -482,6 +628,7 @@ module.exports = function (Sharp) {
     rotate,
     flip,
     flop,
+    affine,
     sharpen,
     median,
     blur,
@@ -490,6 +637,7 @@ module.exports = function (Sharp) {
     negate,
     normalise,
     normalize,
+    clahe,
     convolve,
     threshold,
     boolean,

lib/output.js

@@ -6,6 +6,7 @@ const sharp = require('../build/Release/sharp.node');
 const formats = new Map([
   ['heic', 'heif'],
   ['heif', 'heif'],
+  ['avif', 'avif'],
   ['jpeg', 'jpeg'],
   ['jpg', 'jpeg'],
   ['png', 'png'],
@@ -15,11 +16,13 @@ const formats = new Map([
   ['gif', 'gif']
 ]);
 
+const errMagickSave = new Error('GIF output requires libvips with support for ImageMagick');
+
 /**
  * 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, 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.
@@ -46,32 +49,30 @@ const formats = new Map([
  * @throws {Error} Invalid parameters
  */
 function toFile (fileOut, callback) {
-  if (!fileOut || fileOut.length === 0) {
-    const errOutputInvalid = new Error('Missing output file path');
+  let err;
+  if (!is.string(fileOut)) {
+    err = new Error('Missing output file path');
+  } else if (this.options.input.file === fileOut) {
+    err = new Error('Cannot use same file for input and output');
+  } else if (this.options.formatOut === 'input' && fileOut.toLowerCase().endsWith('.gif') && !this.constructor.format.magick.output.file) {
+    err = errMagickSave;
+  }
+  if (err) {
     if (is.fn(callback)) {
-      callback(errOutputInvalid);
+      callback(err);
     } else {
-      return Promise.reject(errOutputInvalid);
+      return Promise.reject(err);
     }
   } else {
-    if (this.options.input.file === fileOut) {
-      const errOutputIsInput = new Error('Cannot use same file for input and output');
-      if (is.fn(callback)) {
-        callback(errOutputIsInput);
-      } else {
-        return Promise.reject(errOutputIsInput);
-      }
-    } else {
-      this.options.fileOut = fileOut;
-      return this._pipeline(callback);
-    }
+    this.options.fileOut = fileOut;
+    return this._pipeline(callback);
   }
   return this;
 }
 
 /**
  * Write output to a Buffer.
- * JPEG, PNG, WebP, TIFF and RAW output are supported.
+ * JPEG, PNG, WebP, AVIF, TIFF and raw pixel data output are supported.
  *
  * If no explicit format is set, the output format will match the input image, except GIF and SVG input which become PNG output.
  *
@@ -103,6 +104,22 @@ function toFile (fileOut, callback) {
  *   .then(({ data, info }) => { ... })
  *   .catch(err => { ... });
  *
+ * @example
+ * 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');
+ *
  * @param {Object} [options]
  * @param {boolean} [options.resolveWithObject] Resolve the Promise with an Object containing `data` and `info` properties instead of resolving only with `data`.
  * @param {Function} [callback]
@@ -131,9 +148,29 @@ function toBuffer (options, callback) {
  *   .toFile('output-with-metadata.jpg')
  *   .then(info => { ... });
  *
+ * @example
+ * // Set "IFD0-Copyright" in output EXIF metadata
+ * const data = await sharp(input)
+ *   .withMetadata({
+ *     exif: {
+ *       IFD0: {
+ *         Copyright: 'Wernham Hogg'
+ *       }
+ *     }
+ *   })
+ *   .toBuffer();
+ *
+ *  * @example
+ * // Set output metadata to 96 DPI
+ * const data = await sharp(input)
+ *   .withMetadata({ density: 96 })
+ *   .toBuffer();
+ *
  * @param {Object} [options]
  * @param {number} [options.orientation] value between 1 and 8, used to update the EXIF `Orientation` tag.
  * @param {string} [options.icc] filesystem path to output ICC profile, defaults to sRGB.
+ * @param {Object<Object>} [options.exif={}] Object keyed by IFD0, IFD1 etc. of key/value string pairs to write as EXIF data.
+ * @param {number} [options.density] Number of pixels per inch (DPI).
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -147,6 +184,13 @@ function withMetadata (options) {
         throw is.invalidParameterError('orientation', 'integer between 1 and 8', options.orientation);
       }
     }
+    if (is.defined(options.density)) {
+      if (is.number(options.density) && options.density > 0) {
+        this.options.withMetadataDensity = options.density;
+      } else {
+        throw is.invalidParameterError('density', 'positive number', options.density);
+      }
+    }
     if (is.defined(options.icc)) {
       if (is.string(options.icc)) {
         this.options.withMetadataIcc = options.icc;
@@ -154,6 +198,25 @@ function withMetadata (options) {
         throw is.invalidParameterError('icc', 'string filesystem path to ICC profile', options.icc);
       }
     }
+    if (is.defined(options.exif)) {
+      if (is.object(options.exif)) {
+        for (const [ifd, entries] of Object.entries(options.exif)) {
+          if (is.object(entries)) {
+            for (const [k, v] of Object.entries(entries)) {
+              if (is.string(v)) {
+                this.options.withMetadataStrs[`exif-${ifd.toLowerCase()}-${k}`] = v;
+              } else {
+                throw is.invalidParameterError(`exif.${ifd}.${k}`, 'string', v);
+              }
+            }
+          } else {
+            throw is.invalidParameterError(`exif.${ifd}`, 'object', entries);
+          }
+        }
+      } else {
+        throw is.invalidParameterError('exif', 'object', options.exif);
+      }
+    }
   }
   return this;
 }
@@ -173,7 +236,7 @@ function withMetadata (options) {
  * @throws {Error} unsupported format or options
  */
 function toFormat (format, options) {
-  const actualFormat = formats.get(is.object(format) && is.string(format.id) ? format.id : format);
+  const actualFormat = formats.get((is.object(format) && is.string(format.id) ? format.id : format).toLowerCase());
   if (!actualFormat) {
     throw is.invalidParameterError('format', `one of: ${[...formats.keys()].join(', ')}`, format);
   }
@@ -183,8 +246,6 @@ function toFormat (format, options) {
 /**
  * Use these JPEG options for output image.
  *
- * Some of these options require the use of a globally-installed libvips compiled with support for mozjpeg.
- *
  * @example
  * // Convert any input to very high quality JPEG output
  * const data = await sharp(input)
@@ -194,18 +255,25 @@ function toFormat (format, options) {
  *   })
  *   .toBuffer();
  *
+ * @example
+ * // Use mozjpeg to reduce output JPEG file size (slower)
+ * const data = await sharp(input)
+ *   .jpeg({ mozjpeg: true })
+ *   .toBuffer();
+ *
  * @param {Object} [options] - output options
  * @param {number} [options.quality=80] - quality, integer 1-100
  * @param {boolean} [options.progressive=false] - use progressive (interlace) scan
  * @param {string} [options.chromaSubsampling='4:2:0'] - set to '4:4:4' to prevent chroma subsampling otherwise defaults to '4:2:0' chroma subsampling
  * @param {boolean} [options.optimiseCoding=true] - optimise Huffman coding tables
  * @param {boolean} [options.optimizeCoding=true] - alternative spelling of optimiseCoding
- * @param {boolean} [options.trellisQuantisation=false] - apply trellis quantisation, requires libvips compiled with support for mozjpeg
- * @param {boolean} [options.overshootDeringing=false] - apply overshoot deringing, requires libvips compiled with support for mozjpeg
- * @param {boolean} [options.optimiseScans=false] - optimise progressive scans, forces progressive, requires libvips compiled with support for mozjpeg
- * @param {boolean} [options.optimizeScans=false] - alternative spelling of optimiseScans, requires libvips compiled with support for mozjpeg
- * @param {number} [options.quantisationTable=0] - quantization table to use, integer 0-8, requires libvips compiled with support for mozjpeg
- * @param {number} [options.quantizationTable=0] - alternative spelling of quantisationTable, requires libvips compiled with support for mozjpeg
+ * @param {boolean} [options.mozjpeg=false] - use mozjpeg defaults, equivalent to `{ trellisQuantisation: true, overshootDeringing: true, optimiseScans: true, quantisationTable: 3 }`
+ * @param {boolean} [options.trellisQuantisation=false] - apply trellis quantisation
+ * @param {boolean} [options.overshootDeringing=false] - apply overshoot deringing
+ * @param {boolean} [options.optimiseScans=false] - optimise progressive scans, forces progressive
+ * @param {boolean} [options.optimizeScans=false] - alternative spelling of optimiseScans
+ * @param {number} [options.quantisationTable=0] - quantization table to use, integer 0-8
+ * @param {number} [options.quantizationTable=0] - alternative spelling of quantisationTable
  * @param {boolean} [options.force=true] - force JPEG output, otherwise attempt to use input format
  * @returns {Sharp}
  * @throws {Error} Invalid options
@@ -229,6 +297,23 @@ function jpeg (options) {
         throw is.invalidParameterError('chromaSubsampling', 'one of: 4:2:0, 4:4:4', options.chromaSubsampling);
       }
     }
+    const optimiseCoding = is.bool(options.optimizeCoding) ? options.optimizeCoding : options.optimiseCoding;
+    if (is.defined(optimiseCoding)) {
+      this._setBooleanOption('jpegOptimiseCoding', optimiseCoding);
+    }
+    if (is.defined(options.mozjpeg)) {
+      if (is.bool(options.mozjpeg)) {
+        if (options.mozjpeg) {
+          this.options.jpegTrellisQuantisation = true;
+          this.options.jpegOvershootDeringing = true;
+          this.options.jpegOptimiseScans = true;
+          this.options.jpegProgressive = true;
+          this.options.jpegQuantisationTable = 3;
+        }
+      } else {
+        throw is.invalidParameterError('mozjpeg', 'boolean', options.mozjpeg);
+      }
+    }
     const trellisQuantisation = is.bool(options.trellisQuantization) ? options.trellisQuantization : options.trellisQuantisation;
     if (is.defined(trellisQuantisation)) {
       this._setBooleanOption('jpegTrellisQuantisation', trellisQuantisation);
@@ -243,10 +328,6 @@ function jpeg (options) {
         this.options.jpegProgressive = true;
       }
     }
-    const optimiseCoding = is.bool(options.optimizeCoding) ? options.optimizeCoding : options.optimiseCoding;
-    if (is.defined(optimiseCoding)) {
-      this._setBooleanOption('jpegOptimiseCoding', optimiseCoding);
-    }
     const quantisationTable = is.number(options.quantizationTable) ? options.quantizationTable : options.quantisationTable;
     if (is.defined(quantisationTable)) {
       if (is.integer(quantisationTable) && is.inRange(quantisationTable, 0, 8)) {
@@ -262,26 +343,31 @@ function jpeg (options) {
 /**
  * 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.
- *
- * Some of these options require the use of a globally-installed libvips compiled with support for libimagequant (GPL).
+ * Set `palette` to `true` for slower, indexed PNG output.
  *
  * @example
- * // Convert any input to PNG output
+ * // Convert any input to full colour PNG output
  * const data = await sharp(input)
  *   .png()
  *   .toBuffer();
  *
+ * @example
+ * // Convert any input to indexed PNG output (slower)
+ * const data = await sharp(input)
+ *   .png({ palette: true })
+ *   .toBuffer();
+ *
  * @param {Object} [options]
  * @param {boolean} [options.progressive=false] - use progressive (interlace) scan
- * @param {number} [options.compressionLevel=9] - zlib compression level, 0-9
+ * @param {number} [options.compressionLevel=6] - zlib compression level, 0 (fastest, largest) to 9 (slowest, smallest)
  * @param {boolean} [options.adaptiveFiltering=false] - use adaptive row filtering
- * @param {boolean} [options.palette=false] - quantise to a palette-based image with alpha transparency support, requires libvips compiled with support for libimagequant
- * @param {number} [options.quality=100] - use the lowest number of colours needed to achieve given quality, sets `palette` to `true`, requires libvips compiled with support for libimagequant
- * @param {number} [options.colours=256] - maximum number of palette entries, sets `palette` to `true`, requires libvips compiled with support for libimagequant
- * @param {number} [options.colors=256] - alternative spelling of `options.colours`, sets `palette` to `true`, requires libvips compiled with support for libimagequant
- * @param {number} [options.dither=1.0] - level of Floyd-Steinberg error diffusion, sets `palette` to `true`, requires libvips compiled with support for libimagequant
+ * @param {boolean} [options.palette=false] - quantise to a palette-based image with alpha transparency support
+ * @param {number} [options.quality=100] - use the lowest number of colours needed to achieve given quality, sets `palette` to `true`
+ * @param {number} [options.colours=256] - maximum number of palette entries, sets `palette` to `true`
+ * @param {number} [options.colors=256] - alternative spelling of `options.colours`, sets `palette` to `true`
+ * @param {number} [options.dither=1.0] - level of Floyd-Steinberg error diffusion, sets `palette` to `true`
  * @param {boolean} [options.force=true] - force PNG output, otherwise attempt to use input format
  * @returns {Sharp}
  * @throws {Error} Invalid options
@@ -343,6 +429,12 @@ function png (options) {
  *   .webp({ lossless: true })
  *   .toBuffer();
  *
+ * @example
+ * // Optimise the file size of an animated WebP
+ * const outputWebp = await sharp(inputWebp, { animated: true })
+ *   .webp({ reductionEffort: 6 })
+ *   .toBuffer();
+ *
  * @param {Object} [options] - output options
  * @param {number} [options.quality=80] - quality, integer 1-100
  * @param {number} [options.alphaQuality=100] - quality of alpha layer, integer 0-100
@@ -411,7 +503,7 @@ function webp (options) {
 /* istanbul ignore next */
 function gif (options) {
   if (!this.constructor.format.magick.output.buffer) {
-    throw new Error('The gif operation requires libvips to have been installed with support for ImageMagick');
+    throw errMagickSave;
   }
   trySetAnimationOptions(options, this.options);
   return this._updateFormatOut('gif', options);
@@ -471,15 +563,15 @@ function trySetAnimationOptions (source, target) {
  * @param {Object} [options] - output options
  * @param {number} [options.quality=80] - quality, integer 1-100
  * @param {boolean} [options.force=true] - force TIFF output, otherwise attempt to use input format
- * @param {boolean} [options.compression='jpeg'] - compression options: lzw, deflate, jpeg, ccittfax4
- * @param {boolean} [options.predictor='horizontal'] - compression predictor options: none, horizontal, float
+ * @param {string} [options.compression='jpeg'] - compression options: lzw, deflate, jpeg, ccittfax4
+ * @param {string} [options.predictor='horizontal'] - compression predictor options: none, horizontal, float
  * @param {boolean} [options.pyramid=false] - write an image pyramid
  * @param {boolean} [options.tile=false] - write a tiled tiff
- * @param {boolean} [options.tileWidth=256] - horizontal tile size
- * @param {boolean} [options.tileHeight=256] - vertical tile size
+ * @param {number} [options.tileWidth=256] - horizontal tile size
+ * @param {number} [options.tileHeight=256] - vertical tile size
  * @param {number} [options.xres=1.0] - horizontal resolution in pixels/mm
  * @param {number} [options.yres=1.0] - vertical resolution in pixels/mm
- * @param {boolean} [options.bitdepth=8] - reduce bitdepth to 1, 2 or 4 bit
+ * @param {number} [options.bitdepth=8] - reduce bitdepth to 1, 2 or 4 bit
  * @returns {Sharp}
  * @throws {Error} Invalid options
  */
@@ -556,29 +648,44 @@ function tiff (options) {
   return this._updateFormatOut('tiff', options);
 }
 
+/**
+ * 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.
+ *
+ * @since 0.27.0
+ *
+ * @param {Object} [options] - output options
+ * @param {number} [options.quality=50] - quality, integer 1-100
+ * @param {boolean} [options.lossless=false] - use lossless compression
+ * @param {number} [options.speed=5] - CPU effort vs file size, 0 (slowest/smallest) to 8 (fastest/largest)
+ * @param {string} [options.chromaSubsampling='4:2:0'] - set to '4:4:4' to prevent chroma subsampling otherwise defaults to '4:2:0' chroma subsampling, requires libvips v8.11.0
+ * @returns {Sharp}
+ * @throws {Error} Invalid options
+ */
+function avif (options) {
+  return this.heif({ ...options, compression: 'av1' });
+}
+
 /**
  * Use these HEIF options for output image.
  *
- * Support for HEIF (HEIC/AVIF) is experimental.
- * Do not use this in production systems.
- *
- * Requires a custom, globally-installed libvips compiled with support for libheif.
- *
- * Most versions of libheif support only the patent-encumbered HEVC compression format.
+ * Support for patent-encumbered HEIC images requires the use of a
+ * globally-installed libvips compiled with support for libheif, libde265 and x265.
  *
  * @since 0.23.0
  *
  * @param {Object} [options] - output options
- * @param {number} [options.quality=80] - quality, integer 1-100
- * @param {boolean} [options.compression='hevc'] - compression format: hevc, avc, jpeg, av1
+ * @param {number} [options.quality=50] - quality, integer 1-100
+ * @param {string} [options.compression='av1'] - compression format: av1, hevc
  * @param {boolean} [options.lossless=false] - use lossless compression
+ * @param {number} [options.speed=5] - CPU effort vs file size, 0 (slowest/smallest) to 8 (fastest/largest)
+ * @param {string} [options.chromaSubsampling='4:2:0'] - set to '4:4:4' to prevent chroma subsampling otherwise defaults to '4:2:0' chroma subsampling, requires libvips v8.11.0
  * @returns {Sharp}
  * @throws {Error} Invalid options
  */
 function heif (options) {
-  if (!this.constructor.format.heif.output.buffer) {
-    throw new Error('The heif operation requires libvips to have been installed with support for libheif');
-  }
   if (is.object(options)) {
     if (is.defined(options.quality)) {
       if (is.integer(options.quality) && is.inRange(options.quality, 1, 100)) {
@@ -595,10 +702,24 @@ function heif (options) {
       }
     }
     if (is.defined(options.compression)) {
-      if (is.string(options.compression) && is.inArray(options.compression, ['hevc', 'avc', 'jpeg', 'av1'])) {
+      if (is.string(options.compression) && is.inArray(options.compression, ['av1', 'hevc'])) {
         this.options.heifCompression = options.compression;
       } else {
-        throw is.invalidParameterError('compression', 'one of: hevc, avc, jpeg, av1', options.compression);
+        throw is.invalidParameterError('compression', 'one of: av1, hevc', options.compression);
+      }
+    }
+    if (is.defined(options.speed)) {
+      if (is.integer(options.speed) && is.inRange(options.speed, 0, 8)) {
+        this.options.heifSpeed = options.speed;
+      } else {
+        throw is.invalidParameterError('speed', 'integer between 0 and 8', options.speed);
+      }
+    }
+    if (is.defined(options.chromaSubsampling)) {
+      if (is.string(options.chromaSubsampling) && is.inArray(options.chromaSubsampling, ['4:2:0', '4:4:4'])) {
+        this.options.heifChromaSubsampling = options.chromaSubsampling;
+      } else {
+        throw is.invalidParameterError('chromaSubsampling', 'one of: 4:2:0, 4:4:4', options.chromaSubsampling);
       }
     }
   }
@@ -658,6 +779,9 @@ function raw () {
  * @param {number} [options.skipBlanks=-1] threshold to skip tile generation, a value 0 - 255 for 8-bit images or 0 - 65535 for 16-bit images
  * @param {string} [options.container='fs'] tile container, with value `fs` (filesystem) or `zip` (compressed file).
  * @param {string} [options.layout='dz'] filesystem layout, possible values are `dz`, `iiif`, `zoomify` or `google`.
+ * @param {boolean} [options.centre=false] centre image in tile.
+ * @param {boolean} [options.center=false] alternative spelling of centre.
+ * @param {string} [options.id='https://example.com/iiif'] when `layout` is `iiif`, sets the `@id` attribute of `info.json`
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -726,6 +850,19 @@ function tile (options) {
     } else if (is.defined(options.layout) && options.layout === 'google') {
       this.options.tileSkipBlanks = 5;
     }
+    // Center image in tile
+    const centre = is.bool(options.center) ? options.center : options.centre;
+    if (is.defined(centre)) {
+      this._setBooleanOption('tileCentre', centre);
+    }
+    // @id attribute for IIIF layout
+    if (is.defined(options.id)) {
+      if (is.string(options.id)) {
+        this.options.tileId = options.id;
+      } else {
+        throw is.invalidParameterError('id', 'string', options.id);
+      }
+    }
   }
   // Format
   if (is.inArray(this.options.formatOut, ['jpeg', 'png', 'webp'])) {
@@ -884,6 +1021,7 @@ module.exports = function (Sharp) {
     png,
     webp,
     tiff,
+    avif,
     heif,
     gif,
     raw,

lib/resize.js

@@ -302,11 +302,20 @@ function resize (width, height, options) {
  *   })
  *   ...
  *
+* @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]
- * @param {number} [extend.left]
- * @param {number} [extend.bottom]
- * @param {number} [extend.right]
+ * @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
@@ -317,17 +326,35 @@ function extend (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 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);
@@ -386,7 +413,8 @@ function extract (options) {
  * Trim "boring" pixels from all edges that contain values similar to the top-left pixel.
  * Images consisting entirely of a single colour will calculate "boring" using the alpha channel, if any.
  *
- * The `info` response Object will contain `trimOffsetLeft` and `trimOffsetTop` properties.
+ * The `info` response Object, obtained from callback of `.toFile()` or `.toBuffer()`,
+ * will contain `trimOffsetLeft` and `trimOffsetTop` properties.
  *
  * @param {number} [threshold=10] the allowed difference from the top-left pixel, a number greater than zero.
  * @returns {Sharp}

lib/utility.js

@@ -1,6 +1,8 @@
 'use strict';
 
 const events = require('events');
+const detectLibc = require('detect-libc');
+
 const is = require('./is');
 const sharp = require('../build/Release/sharp.node');
 
@@ -13,6 +15,26 @@ const sharp = require('../build/Release/sharp.node');
  */
 const format = sharp.format();
 
+/**
+ * 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/jcupitt/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/jcupitt/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
@@ -64,8 +86,12 @@ cache(true);
 /**
  * Gets or, when a concurrency is provided, sets
  * the number of threads _libvips'_ should create to process each image.
- * The default value is the number of CPU cores.
- * A value of `0` will reset to this default.
+ *
+ * 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.
  *
  * The maximum number of images that can be processed in parallel
  * is limited by libuv's `UV_THREADPOOL_SIZE` environment variable.
@@ -83,6 +109,11 @@ cache(true);
 function concurrency (concurrency) {
   return sharp.concurrency(is.integer(concurrency) ? concurrency : null);
 }
+/* istanbul ignore next */
+if (detectLibc.family === 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:
@@ -137,15 +168,12 @@ simd(true);
  * @private
  */
 module.exports = function (Sharp) {
-  [
-    cache,
-    concurrency,
-    counters,
-    simd
-  ].forEach(function (f) {
-    Sharp[f.name] = f;
-  });
+  Sharp.cache = cache;
+  Sharp.concurrency = concurrency;
+  Sharp.counters = counters;
+  Sharp.simd = simd;
   Sharp.format = format;
+  Sharp.interpolators = interpolators;
   Sharp.versions = versions;
   Sharp.queue = queue;
 };

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",
-  "version": "0.26.1",
+  "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP, AVIF and TIFF images",
+  "version": "0.28.3",
   "author": "Lovell Fuller <npm@lovell.info>",
   "homepage": "https://github.com/lovell/sharp",
   "contributors": [
@@ -69,17 +69,26 @@
     "Edward Silverton <e.silverton@gmail.com>",
     "Roman Malieiev <aromaleev@gmail.com>",
     "Tomas Szabo <tomas.szabo@deftomat.com>",
-    "Robert O'Rourke <robert@o-rourke.org>"
+    "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>"
   ],
   "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/ .nyc_output/ coverage/ test/fixtures/output.*",
-    "test": "semistandard && cpplint && npm run test-unit && npm run test-licensing && node install/prebuild-ci",
-    "test-unit": "nyc --reporter=lcov --branches=99 mocha --slow=5000 --timeout=60000 ./test/unit/*.js",
+    "test": "npm run test-lint && npm run test-unit && npm run test-licensing",
+    "test-lint": "semistandard && cpplint",
+    "test-unit": "nyc --reporter=lcov --branches=99 mocha --slow=1000 --timeout=60000 ./test/unit/*.js",
     "test-licensing": "license-checker --production --summary --onlyAllow=\"Apache-2.0;BSD;ISC;MIT\"",
     "test-coverage": "./test/coverage/report.sh",
     "test-leak": "./test/leak/leak.sh",
-    "docs-build": "documentation lint lib && 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 && node docs/search-index/build",
+    "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"
   },
@@ -87,7 +96,6 @@
   "files": [
     "binding.gyp",
     "install/**",
-    "!install/prebuild-ci.js",
     "lib/**",
     "src/**"
   ],
@@ -99,6 +107,7 @@
     "jpeg",
     "png",
     "webp",
+    "avif",
     "tiff",
     "gif",
     "svg",
@@ -112,39 +121,38 @@
     "vips"
   ],
   "dependencies": {
-    "color": "^3.1.2",
+    "color": "^3.1.3",
     "detect-libc": "^1.0.3",
-    "node-addon-api": "^3.0.2",
-    "npmlog": "^4.1.2",
-    "prebuild-install": "^5.3.5",
-    "semver": "^7.3.2",
-    "simple-get": "^4.0.0",
-    "tar-fs": "^2.1.0",
+    "node-addon-api": "^3.2.0",
+    "prebuild-install": "^6.1.2",
+    "semver": "^7.3.5",
+    "simple-get": "^3.1.0",
+    "tar-fs": "^2.1.1",
     "tunnel-agent": "^0.6.0"
   },
   "devDependencies": {
     "async": "^3.2.0",
-    "cc": "^2.0.1",
-    "decompress-zip": "^0.3.2",
-    "documentation": "^13.0.2",
+    "cc": "^3.0.1",
+    "decompress-zip": "^0.3.3",
+    "documentation": "^13.2.5",
     "exif-reader": "^1.0.3",
     "icc": "^2.0.0",
     "license-checker": "^25.0.1",
-    "mocha": "^8.1.1",
-    "mock-fs": "^4.13.0",
+    "mocha": "^8.4.0",
+    "mock-fs": "^4.14.0",
     "nyc": "^15.1.0",
     "prebuild": "^10.0.1",
     "rimraf": "^3.0.2",
-    "semistandard": "^14.2.3"
+    "semistandard": "^16.0.0"
   },
   "license": "Apache-2.0",
   "config": {
-    "libvips": "8.10.0",
+    "libvips": "8.10.6",
     "runtime": "napi",
     "target": 3
   },
   "engines": {
-    "node": ">=10.16.0"
+    "node": ">=10"
   },
   "funding": {
     "url": "https://opencollective.com/libvips"

src/common.cc

@@ -36,6 +36,9 @@ namespace sharp {
   std::string AttrAsStr(Napi::Object obj, std::string attr) {
     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();
   }
@@ -54,13 +57,13 @@ namespace sharp {
   bool AttrAsBool(Napi::Object obj, std::string attr) {
     return obj.Get(attr).As<Napi::Boolean>().Value();
   }
-  std::vector<double> AttrAsRgba(Napi::Object obj, std::string attr) {
-    Napi::Array background = obj.Get(attr).As<Napi::Array>();
-    std::vector<double> rgba(background.Length());
-    for (unsigned int i = 0; i < background.Length(); i++) {
-      rgba[i] = AttrAsDouble(background, i);
+  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 rgba;
+    return vectorOfDouble;
   }
   std::vector<int32_t> AttrAsInt32Vector(Napi::Object obj, std::string attr) {
     Napi::Array array = obj.Get(attr).As<Napi::Array>();
@@ -92,6 +95,7 @@ namespace sharp {
       descriptor->rawChannels = AttrAsUint32(input, "rawChannels");
       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")) {
@@ -104,12 +108,22 @@ namespace sharp {
     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 = AttrAsUint32(input, "createChannels");
       descriptor->createWidth = AttrAsUint32(input, "createWidth");
       descriptor->createHeight = AttrAsUint32(input, "createHeight");
-      descriptor->createBackground = AttrAsRgba(input, "createBackground");
+      if (HasAttr(input, "createNoiseType")) {
+        descriptor->createNoiseType = AttrAsStr(input, "createNoiseType");
+        descriptor->createNoiseMean = AttrAsDouble(input, "createNoiseMean");
+        descriptor->createNoiseSigma = AttrAsDouble(input, "createNoiseSigma");
+      } else {
+        descriptor->createBackground = AttrAsVectorOfDouble(input, "createBackground");
+      }
     }
     // Limit input images to a given number of pixels, where pixels = width * height
     descriptor->limitInputPixels = AttrAsUint32(input, "limitInputPixels");
@@ -180,6 +194,7 @@ namespace sharp {
       case ImageType::OPENSLIDE: id = "openslide"; break;
       case ImageType::PPM: id = "ppm"; break;
       case ImageType::FITS: id = "fits"; break;
+      case ImageType::EXR: id = "exr"; break;
       case ImageType::VIPS: id = "vips"; break;
       case ImageType::RAW: id = "raw"; break;
       case ImageType::UNKNOWN: id = "unknown"; break;
@@ -188,30 +203,41 @@ namespace sharp {
     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 = {
-    { "jpegload", ImageType::JPEG },
-    { "jpegload_buffer", ImageType::JPEG },
-    { "pngload", ImageType::PNG },
-    { "pngload_buffer", ImageType::PNG },
-    { "webpload", ImageType::WEBP },
-    { "webpload_buffer", ImageType::WEBP },
-    { "tiffload", ImageType::TIFF },
-    { "tiffload_buffer", ImageType::TIFF },
-    { "gifload", ImageType::GIF },
-    { "gifload_buffer", ImageType::GIF },
-    { "svgload", ImageType::SVG },
-    { "svgload_buffer", ImageType::SVG },
-    { "heifload", ImageType::HEIF },
-    { "heifload_buffer", ImageType::HEIF },
-    { "pdfload", ImageType::PDF },
-    { "pdfload_buffer", ImageType::PDF },
-    { "magickload", ImageType::MAGICK },
-    { "magickload_buffer", ImageType::MAGICK },
-    { "openslideload", ImageType::OPENSLIDE },
-    { "ppmload", ImageType::PPM },
-    { "fitsload", ImageType::FITS },
-    { "vipsload", ImageType::VIPS },
-    { "rawload", ImageType::RAW }
+    { "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 },
+    { "VipsForeignLoadSvgFile", ImageType::SVG },
+    { "VipsForeignLoadSvgBuffer", ImageType::SVG },
+    { "VipsForeignLoadHeifFile", ImageType::HEIF },
+    { "VipsForeignLoadHeifBuffer", ImageType::HEIF },
+    { "VipsForeignLoadPdfFile", ImageType::PDF },
+    { "VipsForeignLoadPdfBuffer", ImageType::PDF },
+    { "VipsForeignLoadMagickFile", ImageType::MAGICK },
+    { "VipsForeignLoadMagickBuffer", ImageType::MAGICK },
+    { "VipsForeignLoadOpenslide", ImageType::OPENSLIDE },
+    { "VipsForeignLoadPpmFile", ImageType::PPM },
+    { "VipsForeignLoadFits", ImageType::FITS },
+    { "VipsForeignLoadOpenexr", ImageType::EXR },
+    { "VipsForeignLoadVips", ImageType::VIPS },
+    { "VipsForeignLoadVipsFile", ImageType::VIPS },
+    { "VipsForeignLoadRaw", ImageType::RAW }
   };
 
   /*
@@ -221,7 +247,7 @@ namespace sharp {
     ImageType imageType = ImageType::UNKNOWN;
     char const *load = vips_foreign_find_load_buffer(buffer, length);
     if (load != nullptr) {
-      auto it = loaderToType.find(vips_nickname_find(g_type_from_name(load)));
+      auto it = loaderToType.find(load);
       if (it != loaderToType.end()) {
         imageType = it->second;
       }
@@ -236,7 +262,7 @@ namespace sharp {
     ImageType imageType = ImageType::UNKNOWN;
     char const *load = vips_foreign_find_load(file);
     if (load != nullptr) {
-      auto it = loaderToType.find(vips_nickname_find(g_type_from_name(load)));
+      auto it = loaderToType.find(load);
       if (it != loaderToType.end()) {
         imageType = it->second;
       }
@@ -277,6 +303,9 @@ namespace sharp {
         } else {
           image.get_image()->Type = VIPS_INTERPRETATION_sRGB;
         }
+        if (descriptor->rawPremultiplied) {
+          image = image.unpremultiply();
+        }
         imageType = ImageType::RAW;
       } else {
         // Compressed data
@@ -302,6 +331,9 @@ namespace sharp {
             if (imageType == ImageType::OPENSLIDE) {
               option->set("level", descriptor->level);
             }
+            if (imageType == ImageType::TIFF) {
+              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) {
               image = SetDensity(image, descriptor->density);
@@ -316,15 +348,35 @@ namespace sharp {
     } else {
       if (descriptor->createChannels > 0) {
         // Create new image
-        std::vector<double> background = {
-          descriptor->createBackground[0],
-          descriptor->createBackground[1],
-          descriptor->createBackground[2]
-        };
-        if (descriptor->createChannels == 4) {
-          background.push_back(descriptor->createBackground[3]);
+        if (descriptor->createNoiseType == "gaussian") {
+          int const channels = descriptor->createChannels;
+          image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight);
+          std::vector<VImage> bands = {};
+          bands.reserve(channels);
+          for (int _band = 0; _band < channels; _band++) {
+            bands.push_back(image.gaussnoise(
+              descriptor->createWidth,
+              descriptor->createHeight,
+              VImage::option()->set("mean", descriptor->createNoiseMean)->set("sigma", descriptor->createNoiseSigma)));
+          }
+          image = image.bandjoin(bands);
+          image = image.cast(VipsBandFormat::VIPS_FORMAT_UCHAR);
+          if (channels < 3) {
+            image = image.colourspace(VIPS_INTERPRETATION_B_W);
+          } else {
+            image = image.colourspace(VIPS_INTERPRETATION_sRGB);
+          }
+        } else {
+          std::vector<double> background = {
+            descriptor->createBackground[0],
+            descriptor->createBackground[1],
+            descriptor->createBackground[2]
+          };
+          if (descriptor->createChannels == 4) {
+            background.push_back(descriptor->createBackground[3]);
+          }
+          image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight).new_from_image(background);
         }
-        image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight).new_from_image(background);
         image.get_image()->Type = VIPS_INTERPRETATION_sRGB;
         imageType = ImageType::RAW;
       } else {
@@ -354,6 +406,9 @@ namespace sharp {
             if (imageType == ImageType::OPENSLIDE) {
               option->set("level", descriptor->level);
             }
+            if (imageType == ImageType::TIFF) {
+              option->set("subifd", descriptor->subifd);
+            }
             image = VImage::new_from_file(descriptor->file.data(), option);
             if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
               image = SetDensity(image, descriptor->density);
@@ -386,12 +441,7 @@ namespace sharp {
     Uses colour space interpretation with number of channels to guess this.
   */
   bool HasAlpha(VImage image) {
-    int const bands = image.bands();
-    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));
+    return image.has_alpha();
   }
 
   /*
@@ -475,9 +525,8 @@ namespace sharp {
   VImage SetDensity(VImage image, const double density) {
     const double pixelsPerMm = density / 25.4;
     VImage copy = image.copy();
-    copy.set("Xres", pixelsPerMm);
-    copy.set("Yres", pixelsPerMm);
-    copy.set(VIPS_META_RESOLUTION_UNIT, "in");
+    copy.get_image()->Xres = pixelsPerMm;
+    copy.get_image()->Yres = pixelsPerMm;
     return copy;
   }
 
@@ -656,26 +705,18 @@ 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);
   }
 
@@ -775,10 +816,10 @@ namespace sharp {
   /*
     Ensures alpha channel, if missing.
   */
-  VImage EnsureAlpha(VImage image) {
+  VImage EnsureAlpha(VImage image, double const value) {
     if (!HasAlpha(image)) {
       std::vector<double> alpha;
-      alpha.push_back(sharp::MaximumImageAlpha(image.interpretation()));
+      alpha.push_back(value * sharp::MaximumImageAlpha(image.interpretation()));
       image = image.bandjoin_const(alpha);
     }
     return image;

src/common.h

@@ -24,8 +24,10 @@
 
 // Verify platform and compiler compatibility
 
-#if (VIPS_MAJOR_VERSION < 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 10))
-#error "libvips version 8.10.0+ is required - please see https://sharp.pixelplumbing.com/install"
+#if (VIPS_MAJOR_VERSION < 8) || \
+  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 10) || \
+  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION == 10 && VIPS_MICRO_VERSION < 6)
+#error "libvips version 8.10.6+ is required - please see https://sharp.pixelplumbing.com/install"
 #endif
 
 #if ((!defined(__clang__)) && defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)))
@@ -55,13 +57,18 @@ namespace sharp {
     int rawChannels;
     int rawWidth;
     int rawHeight;
+    bool rawPremultiplied;
     int pages;
     int page;
     int level;
+    int subifd;
     int createChannels;
     int createWidth;
     int createHeight;
     std::vector<double> createBackground;
+    std::string createNoiseType;
+    double createNoiseMean;
+    double createNoiseSigma;
 
     InputDescriptor():
       buffer(nullptr),
@@ -74,25 +81,30 @@ namespace sharp {
       rawChannels(0),
       rawWidth(0),
       rawHeight(0),
+      rawPremultiplied(false),
       pages(1),
       page(0),
       level(0),
+      subifd(-1),
       createChannels(0),
       createWidth(0),
       createHeight(0),
-      createBackground{ 0.0, 0.0, 0.0, 255.0 } {}
+      createBackground{ 0.0, 0.0, 0.0, 255.0 },
+      createNoiseMean(0.0),
+      createNoiseSigma(0.0) {}
   };
 
   // Convenience methods to access the attributes of a Napi::Object
   bool HasAttr(Napi::Object obj, std::string attr);
   std::string AttrAsStr(Napi::Object obj, std::string attr);
+  std::string AttrAsStr(Napi::Object obj, unsigned int const attr);
   uint32_t AttrAsUint32(Napi::Object obj, std::string attr);
   int32_t AttrAsInt32(Napi::Object obj, std::string attr);
   int32_t AttrAsInt32(Napi::Object obj, unsigned int const attr);
   double AttrAsDouble(Napi::Object obj, std::string attr);
   double AttrAsDouble(Napi::Object obj, unsigned int const attr);
   bool AttrAsBool(Napi::Object obj, std::string attr);
-  std::vector<double> AttrAsRgba(Napi::Object obj, std::string attr);
+  std::vector<double> AttrAsVectorOfDouble(Napi::Object obj, std::string attr);
   std::vector<int32_t> AttrAsInt32Vector(Napi::Object obj, std::string attr);
 
   // Create an InputDescriptor instance from a Napi::Object describing an input image
@@ -111,6 +123,7 @@ namespace sharp {
     OPENSLIDE,
     PPM,
     FITS,
+    EXR,
     VIPS,
     RAW,
     UNKNOWN,
@@ -288,7 +301,7 @@ namespace sharp {
   /*
     Ensures alpha channel, if missing.
   */
-  VImage EnsureAlpha(VImage image);
+  VImage EnsureAlpha(VImage image, double const value);
 
 }  // namespace sharp
 

src/metadata.cc

@@ -74,6 +74,9 @@ class MetadataWorker : public Napi::AsyncWorker {
       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("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++) {
@@ -83,6 +86,9 @@ class MetadataWorker : public Napi::AsyncWorker {
           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);
       // Derived attributes
       baton->hasAlpha = sharp::HasAlpha(image);
@@ -186,6 +192,9 @@ class MetadataWorker : public Napi::AsyncWorker {
       if (baton->pagePrimary > -1) {
         info.Set("pagePrimary", baton->pagePrimary);
       }
+      if (!baton->compression.empty()) {
+        info.Set("compression", baton->compression);
+      }
       if (!baton->levels.empty()) {
         int i = 0;
         Napi::Array levels = Napi::Array::New(env, static_cast<size_t>(baton->levels.size()));
@@ -197,6 +206,9 @@ class MetadataWorker : public Napi::AsyncWorker {
         }
         info.Set("levels", levels);
       }
+      if (baton->subifds > 0) {
+        info.Set("subifds", baton->subifds);
+      }
       info.Set("hasProfile", baton->hasProfile);
       info.Set("hasAlpha", baton->hasAlpha);
       if (baton->orientation > 0) {

src/metadata.h

@@ -39,7 +39,9 @@ struct MetadataBaton {
   int loop;
   std::vector<int> delay;
   int pagePrimary;
+  std::string compression;
   std::vector<std::pair<int, int>> levels;
+  int subifds;
   bool hasProfile;
   bool hasAlpha;
   int orientation;
@@ -67,6 +69,7 @@ struct MetadataBaton {
     pageHeight(0),
     loop(-1),
     pagePrimary(-1),
+    subifds(0),
     hasProfile(false),
     hasAlpha(false),
     orientation(0),

src/operations.cc

@@ -92,6 +92,13 @@ 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
    */
@@ -149,8 +156,8 @@ namespace sharp {
    */
   VImage Recomb(VImage image, std::unique_ptr<double[]> const &matrix) {
     double *m = matrix.get();
+    image = image.colourspace(VIPS_INTERPRETATION_sRGB);
     return image
-      .colourspace(VIPS_INTERPRETATION_sRGB)
       .recomb(image.bands() == 3
         ? VImage::new_from_memory(
           m, 9 * sizeof(double), 3, 3, 1, VIPS_FORMAT_DOUBLE

src/operations.h

@@ -35,6 +35,11 @@ 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
    */

src/pipeline.cc

@@ -226,7 +226,8 @@ class PipelineWorker : public Napi::AsyncWorker {
       if (
         xshrink == yshrink && xshrink >= 2 * shrink_on_load_factor &&
         (inputImageType == sharp::ImageType::JPEG || inputImageType == sharp::ImageType::WEBP) &&
-        baton->gamma == 0 && baton->topOffsetPre == -1 && baton->trimThreshold == 0.0
+        baton->gamma == 0 && baton->topOffsetPre == -1 && baton->trimThreshold == 0.0 &&
+        image.width() > 3 && image.height() > 3 && baton->input->pages == 1
       ) {
         if (xshrink >= 8 * shrink_on_load_factor) {
           xfactor = xfactor / 8;
@@ -344,9 +345,10 @@ class PipelineWorker : public Napi::AsyncWorker {
       bool const shouldApplyMedian = baton->medianSize > 0;
       bool const shouldComposite = !baton->composite.empty();
       bool const shouldModulate = baton->brightness != 1.0 || baton->saturation != 1.0 || baton->hue != 0.0;
+      bool const shouldApplyClahe = baton->claheWidth != 0 && baton->claheHeight != 0;
 
       if (shouldComposite && !sharp::HasAlpha(image)) {
-        image = sharp::EnsureAlpha(image);
+        image = sharp::EnsureAlpha(image, 1);
       }
 
       bool const shouldPremultiplyAlpha = sharp::HasAlpha(image) &&
@@ -485,6 +487,18 @@ class PipelineWorker : public Napi::AsyncWorker {
           baton->leftOffsetPost, baton->topOffsetPost, baton->widthPost, baton->heightPost);
       }
 
+      // Affine transform
+      if (baton->affineMatrix.size() > 0) {
+        std::vector<double> background;
+        std::tie(image, background) = sharp::ApplyAlpha(image, baton->affineBackground);
+        image = image.affine(baton->affineMatrix, VImage::option()->set("background", background)
+          ->set("idx", baton->affineIdx)
+          ->set("idy", baton->affineIdy)
+          ->set("odx", baton->affineOdx)
+          ->set("ody", baton->affineOdy)
+          ->set("interpolate", baton->affineInterpolator));
+      }
+
       // Extend edges
       if (baton->extendTop > 0 || baton->extendBottom > 0 || baton->extendLeft > 0 || baton->extendRight > 0) {
         std::vector<double> background;
@@ -550,15 +564,23 @@ class PipelineWorker : public Napi::AsyncWorker {
             // Use gravity in overlay
             if (compositeImage.width() <= baton->width) {
               across = static_cast<int>(ceil(static_cast<double>(image.width()) / compositeImage.width()));
+              // Ensure odd number of tiles across when gravity is centre, north or south
+              if (composite->gravity == 0 || composite->gravity == 1 || composite->gravity == 3) {
+                across |= 1;
+              }
             }
             if (compositeImage.height() <= baton->height) {
               down = static_cast<int>(ceil(static_cast<double>(image.height()) / compositeImage.height()));
+              // Ensure odd number of tiles down when gravity is centre, east or west
+              if (composite->gravity == 0 || composite->gravity == 2 || composite->gravity == 4) {
+                down |= 1;
+              }
             }
             if (across != 0 || down != 0) {
               int left;
               int top;
               compositeImage = compositeImage.replicate(across, down);
-              if (composite->left >= 0 && composite->top >= 0) {
+              if (composite->hasOffset) {
                 std::tie(left, top) = sharp::CalculateCrop(
                   compositeImage.width(), compositeImage.height(), image.width(), image.height(),
                   composite->left, composite->top);
@@ -574,16 +596,21 @@ class PipelineWorker : public Napi::AsyncWorker {
           // Ensure image to composite is sRGB with premultiplied alpha
           compositeImage = compositeImage.colourspace(VIPS_INTERPRETATION_sRGB);
           if (!sharp::HasAlpha(compositeImage)) {
-            compositeImage = sharp::EnsureAlpha(compositeImage);
+            compositeImage = sharp::EnsureAlpha(compositeImage, 1);
           }
           if (!composite->premultiplied) compositeImage = compositeImage.premultiply();
           // Calculate position
           int left;
           int top;
-          if (composite->left >= 0 && composite->top >= 0) {
+          if (composite->hasOffset) {
             // Composite image at given offsets
-            std::tie(left, top) = sharp::CalculateCrop(image.width(), image.height(),
-              compositeImage.width(), compositeImage.height(), composite->left, composite->top);
+            if (composite->tile) {
+              std::tie(left, top) = sharp::CalculateCrop(image.width(), image.height(),
+                compositeImage.width(), compositeImage.height(), composite->left, composite->top);
+            } else {
+              left = composite->left;
+              top = composite->top;
+            }
           } else {
             // Composite image with given gravity
             std::tie(left, top) = sharp::CalculateCrop(image.width(), image.height(),
@@ -624,6 +651,11 @@ class PipelineWorker : public Napi::AsyncWorker {
         image = sharp::Normalise(image);
       }
 
+      // Apply contrast limiting adaptive histogram equalization (CLAHE)
+      if (shouldApplyClahe) {
+        image = sharp::Clahe(image, baton->claheWidth, baton->claheHeight, baton->claheMaxSlope);
+      }
+
       // Apply bitwise boolean operation between images
       if (baton->boolean != nullptr) {
         VImage booleanImage;
@@ -666,8 +698,8 @@ class PipelineWorker : public Napi::AsyncWorker {
       }
 
       // Ensure alpha channel, if missing
-      if (baton->ensureAlpha) {
-        image = sharp::EnsureAlpha(image);
+      if (baton->ensureAlpha != -1) {
+        image = sharp::EnsureAlpha(image, baton->ensureAlpha);
       }
 
       // Convert image to sRGB, if not already
@@ -692,11 +724,21 @@ class PipelineWorker : public Napi::AsyncWorker {
             ->set("input_profile", "srgb")
             ->set("intent", VIPS_INTENT_PERCEPTUAL));
       }
-
       // Override EXIF Orientation tag
       if (baton->withMetadata && baton->withMetadataOrientation != -1) {
         image = sharp::SetExifOrientation(image, baton->withMetadataOrientation);
       }
+      // Override pixel density
+      if (baton->withMetadataDensity > 0) {
+        image = sharp::SetDensity(image, baton->withMetadataDensity);
+      }
+      // Metadata key/value pairs, e.g. EXIF
+      if (!baton->withMetadataStrs.empty()) {
+        image = image.copy();
+        for (const auto& s : baton->withMetadataStrs) {
+          image.set(s.first.data(), s.second.data());
+        }
+      }
 
       // Number of channels used in output image
       baton->channels = image.bands();
@@ -718,7 +760,7 @@ class PipelineWorker : public Napi::AsyncWorker {
         if (baton->formatOut == "jpeg" || (baton->formatOut == "input" && inputImageType == sharp::ImageType::JPEG)) {
           // Write JPEG to buffer
           sharp::AssertImageTypeDimensions(image, sharp::ImageType::JPEG);
-          VipsArea *area = VIPS_AREA(image.jpegsave_buffer(VImage::option()
+          VipsArea *area = reinterpret_cast<VipsArea*>(image.jpegsave_buffer(VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("Q", baton->jpegQuality)
             ->set("interlace", baton->jpegProgressive)
@@ -745,7 +787,7 @@ class PipelineWorker : public Napi::AsyncWorker {
            inputImageType == sharp::ImageType::SVG))) {
           // Write PNG to buffer
           sharp::AssertImageTypeDimensions(image, sharp::ImageType::PNG);
-          VipsArea *area = VIPS_AREA(image.pngsave_buffer(VImage::option()
+          VipsArea *area = reinterpret_cast<VipsArea*>(image.pngsave_buffer(VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("interlace", baton->pngProgressive)
             ->set("compression", baton->pngCompressionLevel)
@@ -763,7 +805,7 @@ class PipelineWorker : public Napi::AsyncWorker {
           (baton->formatOut == "input" && inputImageType == sharp::ImageType::WEBP)) {
           // Write WEBP to buffer
           sharp::AssertImageTypeDimensions(image, sharp::ImageType::WEBP);
-          VipsArea *area = VIPS_AREA(image.webpsave_buffer(VImage::option()
+          VipsArea *area = reinterpret_cast<VipsArea*>(image.webpsave_buffer(VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("Q", baton->webpQuality)
             ->set("lossless", baton->webpLossless)
@@ -780,7 +822,7 @@ class PipelineWorker : public Napi::AsyncWorker {
           (baton->formatOut == "input" && inputImageType == sharp::ImageType::GIF && supportsGifOutput)) {
           // Write GIF to buffer
           sharp::AssertImageTypeDimensions(image, sharp::ImageType::GIF);
-          VipsArea *area = VIPS_AREA(image.magicksave_buffer(VImage::option()
+          VipsArea *area = reinterpret_cast<VipsArea*>(image.magicksave_buffer(VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("optimize_gif_frames", TRUE)
             ->set("optimize_gif_transparency", TRUE)
@@ -801,7 +843,7 @@ class PipelineWorker : public Napi::AsyncWorker {
           if (baton->tiffPredictor == VIPS_FOREIGN_TIFF_PREDICTOR_FLOAT) {
             image = image.cast(VIPS_FORMAT_FLOAT);
           }
-          VipsArea *area = VIPS_AREA(image.tiffsave_buffer(VImage::option()
+          VipsArea *area = reinterpret_cast<VipsArea*>(image.tiffsave_buffer(VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("Q", baton->tiffQuality)
             ->set("bitdepth", baton->tiffBitdepth)
@@ -821,10 +863,15 @@ class PipelineWorker : public Napi::AsyncWorker {
         } else if (baton->formatOut == "heif" ||
           (baton->formatOut == "input" && inputImageType == sharp::ImageType::HEIF)) {
           // Write HEIF to buffer
-          VipsArea *area = VIPS_AREA(image.heifsave_buffer(VImage::option()
+          VipsArea *area = reinterpret_cast<VipsArea*>(image.heifsave_buffer(VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("compression", baton->heifCompression)
             ->set("Q", baton->heifQuality)
+            ->set("speed", baton->heifSpeed)
+#if defined(VIPS_TYPE_FOREIGN_SUBSAMPLE)
+            ->set("subsample_mode", baton->heifChromaSubsampling == "4:4:4"
+              ? VIPS_FOREIGN_SUBSAMPLE_OFF : VIPS_FOREIGN_SUBSAMPLE_ON)
+#endif
             ->set("lossless", baton->heifLossless)));
           baton->bufferOut = static_cast<char*>(area->data);
           baton->bufferOutLength = area->length;
@@ -873,7 +920,7 @@ class PipelineWorker : public Napi::AsyncWorker {
         bool const isV = sharp::IsV(baton->fileOut);
         bool const mightMatchInput = baton->formatOut == "input";
         bool const willMatchInput = mightMatchInput &&
-         !(isJpeg || isPng || isWebp || isGif || isTiff || isDz || isDzZip || isV);
+         !(isJpeg || isPng || isWebp || isGif || isTiff || isHeif || isDz || isDzZip || isV);
 
         if (baton->formatOut == "jpeg" || (mightMatchInput && isJpeg) ||
           (willMatchInput && inputImageType == sharp::ImageType::JPEG)) {
@@ -938,6 +985,10 @@ class PipelineWorker : public Napi::AsyncWorker {
             sharp::AssertImageTypeDimensions(image, sharp::ImageType::JPEG);
             baton->channels = std::min(baton->channels, 3);
           }
+          // Cast pixel values to float, if required
+          if (baton->tiffPredictor == VIPS_FOREIGN_TIFF_PREDICTOR_FLOAT) {
+            image = image.cast(VIPS_FORMAT_FLOAT);
+          }
           image.tiffsave(const_cast<char*>(baton->fileOut.data()), VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("Q", baton->tiffQuality)
@@ -954,13 +1005,15 @@ class PipelineWorker : public Napi::AsyncWorker {
         } else if (baton->formatOut == "heif" || (mightMatchInput && isHeif) ||
           (willMatchInput && inputImageType == sharp::ImageType::HEIF)) {
           // Write HEIF to file
-          if (sharp::IsAvif(baton->fileOut)) {
-            baton->heifCompression = VIPS_FOREIGN_HEIF_COMPRESSION_AV1;
-          }
           image.heifsave(const_cast<char*>(baton->fileOut.data()), VImage::option()
             ->set("strip", !baton->withMetadata)
             ->set("Q", baton->heifQuality)
             ->set("compression", baton->heifCompression)
+            ->set("speed", baton->heifSpeed)
+#if defined(VIPS_TYPE_FOREIGN_SUBSAMPLE)
+            ->set("subsample_mode", baton->heifChromaSubsampling == "4:4:4"
+              ? VIPS_FOREIGN_SUBSAMPLE_OFF : VIPS_FOREIGN_SUBSAMPLE_ON)
+#endif
             ->set("lossless", baton->heifLossless));
           baton->formatOut = "heif";
         } else if (baton->formatOut == "dz" || isDz || isDzZip) {
@@ -1014,6 +1067,8 @@ class PipelineWorker : public Napi::AsyncWorker {
             ->set("suffix", const_cast<char*>(suffix.data()))
             ->set("angle", CalculateAngleRotation(baton->tileAngle))
             ->set("background", baton->tileBackground)
+            ->set("centre", baton->tileCentre)
+            ->set("id", const_cast<char*>(baton->tileId.data()))
             ->set("skip_blanks", baton->tileSkipBlanks);
           // libvips chooses a default depth based on layout. Instead of replicating that logic here by
           // not passing anything - libvips will handle choice
@@ -1241,6 +1296,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
     composite->gravity = sharp::AttrAsUint32(compositeObject, "gravity");
     composite->left = sharp::AttrAsInt32(compositeObject, "left");
     composite->top = sharp::AttrAsInt32(compositeObject, "top");
+    composite->hasOffset = sharp::AttrAsBool(compositeObject, "hasOffset");
     composite->tile = sharp::AttrAsBool(compositeObject, "tile");
     composite->premultiplied = sharp::AttrAsBool(compositeObject, "premultiplied");
     baton->composite.push_back(composite);
@@ -1248,7 +1304,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   // Resize options
   baton->withoutEnlargement = sharp::AttrAsBool(options, "withoutEnlargement");
   baton->position = sharp::AttrAsInt32(options, "position");
-  baton->resizeBackground = sharp::AttrAsRgba(options, "resizeBackground");
+  baton->resizeBackground = sharp::AttrAsVectorOfDouble(options, "resizeBackground");
   baton->kernel = sharp::AttrAsStr(options, "kernel");
   baton->fastShrinkOnLoad = sharp::AttrAsBool(options, "fastShrinkOnLoad");
   // Join Channel Options
@@ -1261,7 +1317,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   }
   // Operators
   baton->flatten = sharp::AttrAsBool(options, "flatten");
-  baton->flattenBackground = sharp::AttrAsRgba(options, "flattenBackground");
+  baton->flattenBackground = sharp::AttrAsVectorOfDouble(options, "flattenBackground");
   baton->negate = sharp::AttrAsBool(options, "negate");
   baton->blurSigma = sharp::AttrAsDouble(options, "blurSigma");
   baton->brightness = sharp::AttrAsDouble(options, "brightness");
@@ -1280,10 +1336,13 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->linearB = sharp::AttrAsDouble(options, "linearB");
   baton->greyscale = sharp::AttrAsBool(options, "greyscale");
   baton->normalise = sharp::AttrAsBool(options, "normalise");
+  baton->claheWidth = sharp::AttrAsUint32(options, "claheWidth");
+  baton->claheHeight = sharp::AttrAsUint32(options, "claheHeight");
+  baton->claheMaxSlope = sharp::AttrAsUint32(options, "claheMaxSlope");
   baton->useExifOrientation = sharp::AttrAsBool(options, "useExifOrientation");
   baton->angle = sharp::AttrAsInt32(options, "angle");
   baton->rotationAngle = sharp::AttrAsDouble(options, "rotationAngle");
-  baton->rotationBackground = sharp::AttrAsRgba(options, "rotationBackground");
+  baton->rotationBackground = sharp::AttrAsVectorOfDouble(options, "rotationBackground");
   baton->rotateBeforePreExtract = sharp::AttrAsBool(options, "rotateBeforePreExtract");
   baton->flip = sharp::AttrAsBool(options, "flip");
   baton->flop = sharp::AttrAsBool(options, "flop");
@@ -1291,11 +1350,18 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->extendBottom = sharp::AttrAsInt32(options, "extendBottom");
   baton->extendLeft = sharp::AttrAsInt32(options, "extendLeft");
   baton->extendRight = sharp::AttrAsInt32(options, "extendRight");
-  baton->extendBackground = sharp::AttrAsRgba(options, "extendBackground");
+  baton->extendBackground = sharp::AttrAsVectorOfDouble(options, "extendBackground");
   baton->extractChannel = sharp::AttrAsInt32(options, "extractChannel");
+  baton->affineMatrix = sharp::AttrAsVectorOfDouble(options, "affineMatrix");
+  baton->affineBackground = sharp::AttrAsVectorOfDouble(options, "affineBackground");
+  baton->affineIdx = sharp::AttrAsDouble(options, "affineIdx");
+  baton->affineIdy = sharp::AttrAsDouble(options, "affineIdy");
+  baton->affineOdx = sharp::AttrAsDouble(options, "affineOdx");
+  baton->affineOdy = sharp::AttrAsDouble(options, "affineOdy");
+  baton->affineInterpolator = vips::VInterpolate::new_from_name(sharp::AttrAsStr(options, "affineInterpolator").data());
 
   baton->removeAlpha = sharp::AttrAsBool(options, "removeAlpha");
-  baton->ensureAlpha = sharp::AttrAsBool(options, "ensureAlpha");
+  baton->ensureAlpha = sharp::AttrAsDouble(options, "ensureAlpha");
   if (options.Has("boolean")) {
     baton->boolean = sharp::CreateInputDescriptor(options.Get("boolean").As<Napi::Object>());
     baton->booleanOp = sharp::GetBooleanOperation(sharp::AttrAsStr(options, "booleanOp"));
@@ -1332,7 +1398,14 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->fileOut = sharp::AttrAsStr(options, "fileOut");
   baton->withMetadata = sharp::AttrAsBool(options, "withMetadata");
   baton->withMetadataOrientation = sharp::AttrAsUint32(options, "withMetadataOrientation");
+  baton->withMetadataDensity = sharp::AttrAsDouble(options, "withMetadataDensity");
   baton->withMetadataIcc = sharp::AttrAsStr(options, "withMetadataIcc");
+  Napi::Object mdStrs = options.Get("withMetadataStrs").As<Napi::Object>();
+  Napi::Array mdStrKeys = mdStrs.GetPropertyNames();
+  for (unsigned int i = 0; i < mdStrKeys.Length(); i++) {
+    std::string k = sharp::AttrAsStr(mdStrKeys, i);
+    baton->withMetadataStrs.insert(std::make_pair(k, sharp::AttrAsStr(mdStrs, k)));
+  }
   // Format-specific
   baton->jpegQuality = sharp::AttrAsUint32(options, "jpegQuality");
   baton->jpegProgressive = sharp::AttrAsBool(options, "jpegProgressive");
@@ -1375,6 +1448,8 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->heifCompression = static_cast<VipsForeignHeifCompression>(
     vips_enum_from_nick(nullptr, VIPS_TYPE_FOREIGN_HEIF_COMPRESSION,
     sharp::AttrAsStr(options, "heifCompression").data()));
+  baton->heifSpeed = sharp::AttrAsUint32(options, "heifSpeed");
+  baton->heifChromaSubsampling = sharp::AttrAsStr(options, "heifChromaSubsampling");
 
   // Animated output
   if (sharp::HasAttr(options, "pageHeight")) {
@@ -1391,7 +1466,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->tileSize = sharp::AttrAsUint32(options, "tileSize");
   baton->tileOverlap = sharp::AttrAsUint32(options, "tileOverlap");
   baton->tileAngle = sharp::AttrAsInt32(options, "tileAngle");
-  baton->tileBackground = sharp::AttrAsRgba(options, "tileBackground");
+  baton->tileBackground = sharp::AttrAsVectorOfDouble(options, "tileBackground");
   baton->tileSkipBlanks = sharp::AttrAsInt32(options, "tileSkipBlanks");
   baton->tileContainer = static_cast<VipsForeignDzContainer>(
     vips_enum_from_nick(nullptr, VIPS_TYPE_FOREIGN_DZ_CONTAINER,
@@ -1403,6 +1478,8 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->tileDepth = static_cast<VipsForeignDzDepth>(
     vips_enum_from_nick(nullptr, VIPS_TYPE_FOREIGN_DZ_DEPTH,
     sharp::AttrAsStr(options, "tileDepth").data()));
+  baton->tileCentre = sharp::AttrAsBool(options, "tileCentre");
+  baton->tileId = sharp::AttrAsStr(options, "tileId");
 
   // Force random access for certain operations
   if (baton->input->access == VIPS_ACCESS_SEQUENTIAL) {

src/pipeline.h

@@ -18,6 +18,7 @@
 #include <memory>
 #include <string>
 #include <vector>
+#include <unordered_map>
 
 #include <napi.h>
 #include <vips/vips8>
@@ -40,6 +41,7 @@ struct Composite {
   int gravity;
   int left;
   int top;
+  bool hasOffset;
   bool tile;
   bool premultiplied;
 
@@ -47,8 +49,9 @@ struct Composite {
     input(nullptr),
     mode(VIPS_BLEND_MODE_OVER),
     gravity(0),
-    left(-1),
-    top(-1),
+    left(0),
+    top(0),
+    hasOffset(false),
     tile(false),
     premultiplied(false) {}
 };
@@ -79,6 +82,7 @@ struct PipelineBaton {
   int cropOffsetLeft;
   int cropOffsetTop;
   bool premultiplied;
+  bool tileCentre;
   std::string kernel;
   bool fastShrinkOnLoad;
   double tintA;
@@ -105,6 +109,9 @@ struct PipelineBaton {
   double gammaOut;
   bool greyscale;
   bool normalise;
+  int claheWidth;
+  int claheHeight;
+  int claheMaxSlope;
   bool useExifOrientation;
   int angle;
   double rotationAngle;
@@ -118,6 +125,13 @@ struct PipelineBaton {
   int extendRight;
   std::vector<double> extendBackground;
   bool withoutEnlargement;
+  std::vector<double> affineMatrix;
+  std::vector<double> affineBackground;
+  double affineIdx;
+  double affineIdy;
+  double affineOdx;
+  double affineOdy;
+  vips::VInterpolate affineInterpolator;
   int jpegQuality;
   bool jpegProgressive;
   std::string jpegChromaSubsampling;
@@ -151,11 +165,15 @@ struct PipelineBaton {
   double tiffYres;
   int heifQuality;
   VipsForeignHeifCompression heifCompression;
+  int heifSpeed;
+  std::string heifChromaSubsampling;
   bool heifLossless;
   std::string err;
   bool withMetadata;
   int withMetadataOrientation;
+  double withMetadataDensity;
   std::string withMetadataIcc;
+  std::unordered_map<std::string, std::string> withMetadataStrs;
   std::unique_ptr<double[]> convKernel;
   int convKernelWidth;
   int convKernelHeight;
@@ -166,7 +184,7 @@ struct PipelineBaton {
   VipsOperationBoolean bandBoolOp;
   int extractChannel;
   bool removeAlpha;
-  bool ensureAlpha;
+  double ensureAlpha;
   VipsInterpretation colourspace;
   int pageHeight;
   std::vector<int> delay;
@@ -180,6 +198,7 @@ struct PipelineBaton {
   std::vector<double> tileBackground;
   int tileSkipBlanks;
   VipsForeignDzDepth tileDepth;
+  std::string tileId;
   std::unique_ptr<double[]> recombMatrix;
 
   PipelineBaton():
@@ -218,6 +237,9 @@ struct PipelineBaton {
     gamma(0.0),
     greyscale(false),
     normalise(false),
+    claheWidth(0),
+    claheHeight(0),
+    claheMaxSlope(3),
     useExifOrientation(false),
     angle(0),
     rotationAngle(0.0),
@@ -230,6 +252,13 @@ struct PipelineBaton {
     extendRight(0),
     extendBackground{ 0.0, 0.0, 0.0, 255.0 },
     withoutEnlargement(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(vips::VInterpolate::new_from_name("bicubic")),
     jpegQuality(80),
     jpegProgressive(false),
     jpegChromaSubsampling("4:2:0"),
@@ -239,7 +268,7 @@ struct PipelineBaton {
     jpegOptimiseScans(false),
     jpegOptimiseCoding(true),
     pngProgressive(false),
-    pngCompressionLevel(9),
+    pngCompressionLevel(6),
     pngAdaptiveFiltering(false),
     pngPalette(false),
     pngQuality(100),
@@ -261,11 +290,14 @@ struct PipelineBaton {
     tiffTileWidth(256),
     tiffXres(1.0),
     tiffYres(1.0),
-    heifQuality(80),
-    heifCompression(VIPS_FOREIGN_HEIF_COMPRESSION_HEVC),
+    heifQuality(50),
+    heifCompression(VIPS_FOREIGN_HEIF_COMPRESSION_AV1),
+    heifSpeed(5),
+    heifChromaSubsampling("4:2:0"),
     heifLossless(false),
     withMetadata(false),
     withMetadataOrientation(-1),
+    withMetadataDensity(0.0),
     convKernelWidth(0),
     convKernelHeight(0),
     convKernelScale(0.0),
@@ -275,7 +307,7 @@ struct PipelineBaton {
     bandBoolOp(VIPS_OPERATION_BOOLEAN_LAST),
     extractChannel(-1),
     removeAlpha(false),
-    ensureAlpha(false),
+    ensureAlpha(-1.0),
     colourspace(VIPS_INTERPRETATION_LAST),
     pageHeight(0),
     delay{-1},

src/sharp.cc

@@ -22,6 +22,7 @@
 #include "stats.h"
 
 static void* sharp_vips_init(void*) {
+  g_setenv("VIPS_MIN_STACK_SIZE", "2m", FALSE);
   vips_init("sharp");
   return nullptr;
 }
@@ -43,6 +44,7 @@ Napi::Object init(Napi::Env env, Napi::Object exports) {
   exports.Set("libvipsVersion", Napi::Function::New(env, libvipsVersion));
   exports.Set("format", Napi::Function::New(env, format));
   exports.Set("_maxColourDistance", Napi::Function::New(env, _maxColourDistance));
+  exports.Set("_isUsingJemalloc", Napi::Function::New(env, _isUsingJemalloc));
   exports.Set("stats", Napi::Function::New(env, stats));
   return exports;
 }

src/utilities.cc

@@ -225,3 +225,19 @@ Napi::Value _maxColourDistance(const Napi::CallbackInfo& info) {
 
   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

@@ -24,5 +24,6 @@ Napi::Value simd(const Napi::CallbackInfo& info);
 Napi::Value libvipsVersion(const Napi::CallbackInfo& info);
 Napi::Value format(const Napi::CallbackInfo& info);
 Napi::Value _maxColourDistance(const Napi::CallbackInfo& info);
+Napi::Value _isUsingJemalloc(const Napi::CallbackInfo& info);
 
 #endif  // SRC_UTILITIES_H_

test/bench/package.json

@@ -8,16 +8,16 @@
     "test": "node perf && node random && node parallel"
   },
   "devDependencies": {
-    "async": "^3.1.0",
-    "benchmark": "^2.1.4",
-    "gm": "^1.23.1",
-    "imagemagick": "^0.1.3",
-    "jimp": "^0.16.0",
-    "mapnik": "^4.5.2",
-    "semver": "^7.1.1"
+    "async": "3.2.0",
+    "benchmark": "2.1.4",
+    "gm": "1.23.1",
+    "imagemagick": "0.1.3",
+    "jimp": "0.16.1",
+    "mapnik": "4.5.6",
+    "semver": "7.3.4"
   },
   "license": "Apache-2.0",
   "engines": {
-    "node": ">=10.16.0"
+    "node": "14"
   }
 }

test/bench/perf.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const os = require('os');
 const fs = require('fs');
 
 const async = require('async');
@@ -15,12 +16,19 @@ const jimp = require('jimp');
 
 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);
 
+// Spawn one thread per CPU
+sharp.concurrency(os.cpus().length);
+
 async.series({
   jpeg: function (callback) {
     const inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
@@ -56,7 +64,7 @@ async.series({
             image
               .resize(width, height, jimp.RESIZE_BICUBIC)
               .quality(80)
-              .write(fixtures.outputJpg, function (err) {
+              .write(outputJpg, function (err) {
                 if (err) {
                   throw err;
                 } else {
@@ -77,7 +85,7 @@ 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();
             });
@@ -105,7 +113,7 @@ async.series({
       fn: function (deferred) {
         imagemagick.resize({
           srcPath: fixtures.inputJpg,
-          dstPath: fixtures.outputJpg,
+          dstPath: outputJpg,
           quality: 0.8,
           width: width,
           height: height,
@@ -128,7 +136,7 @@ async.series({
           .filter('Lanczos')
           .resize(width, height)
           .quality(80)
-          .write(fixtures.outputJpg, function (err) {
+          .write(outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -159,7 +167,7 @@ async.series({
           .filter('Lanczos')
           .resize(width, height)
           .quality(80)
-          .write(fixtures.outputJpg, function (err) {
+          .write(outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -190,7 +198,7 @@ async.series({
       fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputJpg, function (err) {
+          .toFile(outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -217,7 +225,7 @@ 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 {
@@ -229,7 +237,7 @@ 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();
         });
@@ -600,7 +608,7 @@ async.series({
               .resize(width, height)
               .deflateLevel(6)
               .filterType(0)
-              .write(fixtures.outputPng, function (err) {
+              .write(outputPng, function (err) {
                 if (err) {
                   throw err;
                 } else {
@@ -625,7 +633,7 @@ 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();
                 });
@@ -663,7 +671,7 @@ async.series({
       fn: function (deferred) {
         imagemagick.resize({
           srcPath: fixtures.inputPngAlphaPremultiplicationLarge,
-          dstPath: fixtures.outputPng,
+          dstPath: outputPng,
           width: width,
           height: height,
           filter: 'Lanczos',
@@ -689,7 +697,7 @@ async.series({
           .resize(width, height)
           .define('PNG:compression-level=6')
           .define('PNG:compression-filter=0')
-          .write(fixtures.outputPng, function (err) {
+          .write(outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -723,7 +731,7 @@ async.series({
         sharp(inputPngBuffer)
           .resize(width, height)
           .png({ compressionLevel: 6 })
-          .toFile(fixtures.outputPng, function (err) {
+          .toFile(outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -754,7 +762,7 @@ async.series({
         sharp(fixtures.inputPngAlphaPremultiplicationLarge)
           .resize(width, height)
           .png({ compressionLevel: 6 })
-          .toFile(fixtures.outputPng, function (err) {
+          .toFile(outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -841,7 +849,7 @@ async.series({
       fn: function (deferred) {
         sharp(inputWebPBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputWebP, function (err) {
+          .toFile(outputWebP, function (err) {
             if (err) {
               throw err;
             } else {
@@ -868,7 +876,7 @@ 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 {

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(),