Release v0.13.0

Use libvips-dev apk for alpine-linux packaging test

.editorconfig

@@ -0,0 +1,12 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

@@ -1,15 +1,11 @@
-lib-cov
-*.seed
-*.log
-*.csv
-*.dat
-*.out
-*.pid
-*.gz
-
-pids
-logs
-results
 build
 node_modules
-tests/fixtures/output.*
+coverage
+test/bench/node_modules
+test/fixtures/output*
+test/leak/libvips.supp
+lib
+include
+packaging/libvips*
+packaging/*.log
+.DS_Store

.jshintignore

@@ -0,0 +1,3 @@
+node_modules
+test/bench/node_modules
+coverage

.jshintrc

@@ -0,0 +1,12 @@
+{
+  "strict": true,
+  "node": true,
+  "maxparams": 4,
+  "maxcomplexity": 13,
+  "globals": {
+    "beforeEach": true,
+    "afterEach": true,
+    "describe": true,
+    "it": true
+  }
+}

.npmignore

@@ -1,18 +1,15 @@
-lib-cov
-*.seed
-*.log
-*.csv
-*.dat
-*.out
-*.pid
-*.gz
-
-pids
-logs
-results
 build
 node_modules
-
+coverage
+.editorconfig
+.jshintignore
+.jshintrc
 .gitignore
-tests
-.travis.yml
+test
+.travis.yml
+appveyor.yml
+circle.yml
+mkdocs.yml
+lib
+include
+packaging

.travis.yml

@@ -1,17 +1,17 @@
 language: node_js
 node_js:
   - "0.10"
-  - "0.11"
-before_install:
-  - sudo add-apt-repository ppa:lyrasis/precise-backports -y
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq automake gobject-introspection gtk-doc-tools libglib2.0-dev libjpeg-turbo8-dev libpng12-dev libwebp-dev libtiff4-dev libexif-dev libxml2-dev swig graphicsmagick libmagick++-dev
-  - git clone https://github.com/jcupitt/libvips.git
-  - cd libvips
-  - git checkout 7.38
-  - ./bootstrap.sh
-  - ./configure --enable-debug=no --enable-cxx=yes --without-orc --without-python --without-fftw
-  - make
-  - sudo make install
-  - sudo ldconfig
-  - cd $TRAVIS_BUILD_DIR
+  - "0.12"
+  - "4"
+  - "5"
+sudo: false
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - g++-4.8
+env:
+  CXX=g++-4.8
+after_success:
+  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js

CONTRIBUTING.md

@@ -0,0 +1,93 @@
+# Contributing to sharp
+
+Hello, thank you for your interest in helping!
+
+## Submit a new bug report
+
+Please create a [new issue](https://github.com/lovell/sharp/issues/new) containing the steps to reproduce the problem.
+
+If you're having installation problems, please include the output of running `npm install --verbose sharp`.
+
+New bugs are assigned a `triage` label whilst under investigation.
+
+## Submit a new feature request
+
+If a [similar request](https://github.com/lovell/sharp/labels/enhancement) exists, it's probably fastest to add a comment to it about your requirement.
+
+Implementation is usually straightforward if _libvips_ [already supports](http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/ch03.html) the feature you need.
+
+## Submit a Pull Request to fix a bug
+
+Thank you! To prevent the problem occurring again, please add unit tests that would have failed.
+
+Please select the `master` branch as the destination for your Pull Request so your fix can be included in the next minor release.
+
+Please 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`.
+
+## Submit a Pull Request with a new feature
+
+Please add JavaScript [unit tests](https://github.com/lovell/sharp/tree/master/test/unit) to cover your new feature.
+A test coverage report for the JavaScript code is generated in the `coverage/lcov-report` directory.
+
+Where possible, the functional tests use gradient-based perceptual hashes
+based on [dHash](http://www.hackerfactor.com/blog/index.php?/archives/529-Kind-of-Like-That.html)
+to compare expected vs actual images.
+
+You deserve to add your details to the [list of contributors](https://github.com/lovell/sharp/blob/master/package.json#L5).
+
+Any change that modifies the existing public API should be added to the relevant work-in-progress branch for inclusion in the next major release.
+
+| Release | WIP branch |
+| ------: | :--------- |
+| v0.14.0 | needle     |
+| v0.15.0 | outfit     |
+| v0.16.0 | pencil     |
+
+Please squash your changes into a single commit using a command like `git rebase -i upstream/<wip-branch>`.
+
+### Add a new public method
+
+The API tries to be as fluent as possible. Image processing concepts follow the naming conventions from _libvips_ and, to a lesser extent, _ImageMagick_.
+
+Most methods have optional parameters and assume sensible defaults. Methods with mandatory parameters often have names like `doSomethingWith(X)`.
+
+Please ensure backwards compatibility where possible. Methods to modify previously default behaviour often have names like `withoutOptionY()` or `withExtraZ()`.
+
+Feel free to create a [new issue](https://github.com/lovell/sharp/issues/new) to gather feedback on a potential API change.
+
+### Remove an existing public method
+
+A method to be removed should be deprecated in the next major version then removed in the following major version.
+
+By way of example, the [bilinearInterpolation method](https://github.com/lovell/sharp/blob/v0.6.0/index.js#L155) present in v0.5.0 was deprecated in v0.6.0 and removed in v0.7.0.
+
+## Run the tests
+
+### Functional tests and static code analysis
+
+```sh
+npm test
+```
+
+### Memory leak tests
+
+Requires [Valgrind](http://valgrind.org/).
+
+```sh
+npm run test-leak
+```
+
+### Packaging tests
+
+Tests the installation on a number of Linux-based operating systems.
+Requires docker.
+
+```sh
+npm run test-packaging
+```
+
+## Finally
+
+Please feel free to ask any questions via a [new issue](https://github.com/lovell/sharp/issues/new) or contact me by [e-mail](https://github.com/lovell/sharp/blob/master/package.json#L4).

README.md

@@ -1,423 +1,47 @@
 # sharp
 
-* [Installation](https://github.com/lovell/sharp#installation)
-* [Usage examples](https://github.com/lovell/sharp#usage-examples)
-* [API](https://github.com/lovell/sharp#api)
-* [Testing](https://github.com/lovell/sharp#testing)
-* [Performance](https://github.com/lovell/sharp#performance)
-* [Licence](https://github.com/lovell/sharp#licence)
+The typical use case for this high speed Node.js module
+is to convert large images of many formats to
+smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
 
-The typical use case for this high speed Node.js module is to convert large images of many formats to smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
+Resizing an image is typically 4x faster than using the
+quickest ImageMagick and GraphicsMagick settings.
 
-The performance of JPEG resizing is typically 8x faster than ImageMagick and GraphicsMagick, based mainly on the number of CPU cores available.
+Colour spaces, embedded ICC profiles and alpha transparency channels are all handled correctly.
+Bicubic interpolation with Lanczos anti-alias filtering ensures quality is not sacrificed for speed.
 
-Memory usage is kept to a minimum, no child processes are spawned, everything remains non-blocking thanks to _libuv_ and Promises/A+ are supported.
+As well as image resizing, operations such as
+rotation, extraction, compositing and gamma correction are available.
 
-This module supports reading and writing JPEG, PNG and WebP images to and from Streams, Buffer objects and the filesystem. It also supports reading images of many other types from the filesystem via libmagick++ or libgraphicsmagick++ if present.
+Most Windows (x64), Linux and ARMv6+ systems do not require
+the installation of any external runtime dependencies.
 
-When generating JPEG output all metadata is removed and Huffman tables optimised without having to use separate command line tools like [jpegoptim](https://github.com/tjko/jpegoptim) and [jpegtran](http://jpegclub.org/jpegtran/).
+Use with OS X is as simple as running `brew install homebrew/science/vips`
+to install the libvips dependency.
 
-Anyone who has used the Node.js bindings for [GraphicsMagick](https://github.com/aheckmann/gm) will find the API similarly fluent.
+[![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.png?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)
 
-This module is powered by the blazingly fast [libvips](https://github.com/jcupitt/libvips) image processing library, originally created in 1989 at Birkbeck College and currently maintained by [John Cupitt](https://github.com/jcupitt).
+### Documentation
 
-## Installation
+Visit [sharp.dimens.io](http://sharp.dimens.io/) for complete
+[installation instructions](http://sharp.dimens.io/page/install),
+[API documentation](http://sharp.dimens.io/page/api),
+[benchmark tests](http://sharp.dimens.io/page/performance) and
+[changelog](http://sharp.dimens.io/page/changelog).
 
-	npm install sharp
+### Contributing
 
-### Prerequisites
+A [guide for contributors](https://github.com/lovell/sharp/blob/master/CONTRIBUTING.md)
+covers reporting bugs, requesting features and submitting code changes.
 
-* Node.js v0.10+
-* [libvips](https://github.com/jcupitt/libvips) v7.38.5+
+### Licence
 
-_libvips_ can take advantage of [liborc](http://code.entropywave.com/orc/) if present. Warning: versions of _liborc_ prior to 0.4.19 suffer [memory leaks](https://github.com/lovell/sharp/issues/21#issuecomment-42367306) and version 0.4.19 suffers [buffer overflows](https://github.com/lovell/sharp/issues/21#issuecomment-44813498).
-
-### Install libvips on Mac OS
-
-	brew install homebrew/science/vips --with-webp --with-graphicsmagick
-
-A missing or incorrectly configured _Xcode Command Line Tools_ installation [can lead](https://github.com/lovell/sharp/issues/80) to a `library not found for -ljpeg` error. If so, please try:
-
-	xcode-select --install
-
-The _gettext_ dependency of _libvips_ [can lead](https://github.com/lovell/sharp/issues/9) to a `library not found for -lintl` error. If so, please try:
-
-	brew link gettext --force
-
-### Install libvips on Ubuntu Linux
-
-#### Ubuntu 14.x
-
-	sudo apt-get install libvips-dev
-
-#### Ubuntu 13.x
-
-Compiling from source is recommended:
-
-	sudo apt-get install automake build-essential git gobject-introspection gtk-doc-tools libglib2.0-dev libjpeg-turbo8-dev libpng12-dev libwebp-dev libtiff5-dev libexif-dev libxml2-dev swig
-	git clone https://github.com/jcupitt/libvips.git
-	cd libvips
-	git checkout 7.38
-	./bootstrap.sh
-	./configure --enable-debug=no --enable-cxx=yes --without-python --without-orc --without-fftw
-	make
-	sudo make install
-	sudo ldconfig
-
-#### Ubuntu 12.x
-
-Requires `libtiff4-dev` instead of `libtiff5-dev` and has [a bug](https://bugs.launchpad.net/ubuntu/+source/libwebp/+bug/1108731) in the libwebp package. Work around these problems by running these commands first:
-
-	sudo add-apt-repository ppa:lyrasis/precise-backports
-	sudo apt-get update
-	sudo apt-get install libtiff4-dev
-
-Then follow Ubuntu 13.x instructions.
-
-### Install libvips on Heroku
-
-[Alessandro Tagliapietra](https://github.com/alex88) maintains an [Heroku buildpack for libvips](https://github.com/alex88/heroku-buildpack-vips) and its dependencies.
-
-## Usage examples
-
-```javascript
-var sharp = require('sharp');
-```
-
-```javascript
-sharp('input.jpg').resize(300, 200).toFile('output.jpg', function(err) {
-  if (err) {
-    throw err;
-  }
-  // output.jpg is a 300 pixels wide and 200 pixels high image
-  // containing a scaled and cropped version of input.jpg
-});
-```
-
-```javascript
-var transformer = sharp().resize(300, 200).crop(sharp.gravity.north);
-readableStream.pipe(transformer).pipe(writableStream);
-// Read image data from readableStream, resize and write image data to writableStream
-```
-
-```javascript
-var image = sharp(inputJpg);
-image.metadata(function(err, metadata) {
-  image.resize(metadata.width / 2).webp().toBuffer(function(err, outputBuffer, info) {
-    // outputBuffer contains a WebP image half the width and height of the original JPEG
-  });
-});
-```
-
-```javascript
-var pipeline = sharp()
-  .rotate()
-  .resize(null, 200)
-  .progressive()
-  .toBuffer(function(err, outputBuffer, info) {
-    if (err) {
-      throw err;
-    }
-    // outputBuffer contains 200px high progressive JPEG image data,
-    // auto-rotated using EXIF Orientation tag
-    // info.width and info.height contain the dimensions of the resized image
-  });
-readableStream.pipe(pipeline);
-```
-
-```javascript
-sharp('input.png')
-  .rotate(180)
-  .resize(300)
-  .sharpen()
-  .quality(90)
-  .webp()
-  .toBuffer()
-  .then(function(outputBuffer) {
-    // outputBuffer contains 300px wide, upside down, sharpened,
-    // 90% quality WebP image data
-  });
-```
-
-```javascript
-http.createServer(function(request, response) {
-  response.writeHead(200, {'Content-Type': 'image/webp'});
-  sharp('input.jpg').rotate().resize(200).webp().pipe(response);
-}).listen(8000);
-// Create HTTP server that always returns auto-rotated 'input.jpg',
-// resized to 200 pixels wide, in WebP format
-```
-
-```javascript
-sharp(inputBuffer)
-  .resize(200, 300)
-  .interpolateWith(sharp.interpolator.nohalo)
-  .embedWhite()
-  .toFile('output.tiff')
-  .then(function() {
-    // output.tiff is a 200 pixels wide and 300 pixels high image
-    // containing a bicubic scaled version, embedded on a white canvas,
-    // of the image data in inputBuffer
-  });
-```
-
-```javascript
-sharp('input.gif').resize(200, 300).embedBlack().webp().toBuffer(function(err, outputBuffer) {
-  if (err) {
-    throw err;
-  }
-  // outputBuffer contains WebP image data of a 200 pixels wide and 300 pixels high
-  // containing a scaled version, embedded on a black canvas, of input.gif
-});
-```
-
-```javascript
-sharp(inputBuffer).resize(200, 200).max().jpeg().toBuffer().then(function(outputBuffer) {
-  // outputBuffer contains JPEG image data no wider than 200 pixels and no higher
-  // than 200 pixels regardless of the inputBuffer image dimensions
-});
-```
-
-## API
-
-### Input methods
-
-#### sharp([input])
-
-Constructor to which further methods are chained. `input`, if present, can be one of:
-
-* Buffer containing JPEG, PNG or WebP image data, or
-* String containing the filename of an image, with most major formats supported.
-
-The object returned implements the [stream.Duplex](http://nodejs.org/api/stream.html#stream_class_stream_duplex) class.
-
-JPEG, PNG or WebP format image data can be streamed into the object when `input` is not provided.
-
-JPEG, PNG or WebP format image data can be streamed out from this object.
-
-#### metadata([callback])
-
-Fast access to image metadata without decoding any compressed image data.
-
-`callback`, if present, gets the arguments `(err, metadata)` where `metadata` has the attributes:
-
-* `format`: Name of decoder to be used to decompress image data e.g. `jpeg`, `png`, `webp` (for file-based input additionally `tiff` and `magick`)
-* `width`: Number of pixels wide
-* `height`: Number of pixels high
-* `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `scrgb`, `cmyk`, `lab`, `xyz`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L502)
-* `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
-* `orientation`: Number value of the EXIF Orientation header, if present
-
-A Promises/A+ promise is returned when `callback` is not provided.
-
-#### sequentialRead()
-
-An advanced setting that switches the libvips access method to `VIPS_ACCESS_SEQUENTIAL`. This will reduce memory usage and can improve performance on some systems.
-
-### Image transformation options
-
-#### resize(width, [height])
-
-Scale output to `width` x `height`. By default, the resized image is cropped to the exact size specified.
-
-`width` is the Number of pixels wide the resultant image should be. Use `null` or `undefined` to auto-scale the width to match the height.
-
-`height` is the Number of pixels high the resultant image should be. Use `null` or `undefined` to auto-scale the height to match the width.
-
-#### crop([gravity])
-
-Crop the resized image to the exact size specified, the default behaviour.
-
-`gravity`, if present, is an attribute of the `sharp.gravity` Object e.g. `sharp.gravity.north`.
-
-Possible values are `north`, `east`, `south`, `west`, `center` and `centre`. The default gravity is `center`/`centre`.
-
-#### max()
-
-Preserving aspect ratio, resize the image to the maximum width or height specified.
-
-Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
-
-#### embedWhite()
-
-Embed the resized image on a white background of the exact size specified.
-
-#### embedBlack()
-
-Embed the resized image on a black background of the exact size specified.
-
-#### rotate([angle])
-
-Rotate the output image by either an explicit angle or auto-orient based on the EXIF `Orientation` tag.
-
-`angle`, if present, is a Number with a value of `0`, `90`, `180` or `270`.
-
-Use this method without `angle` to determine the angle from EXIF data. Mirroring is currently unsupported.
-
-#### withoutEnlargement()
-
-Do not enlarge the output image if the input image width *or* height are already less than the required dimensions.
-
-This is equivalent to GraphicsMagick's `>` geometry option: "change the dimensions of the image only if its width or height exceeds the geometry specification".
-
-#### sharpen()
-
-Perform a mild sharpen of the resultant image. This typically reduces performance by 30%.
-
-#### interpolateWith(interpolator)
-
-Use the given interpolator for image resizing, where `interpolator` is an attribute of the `sharp.interpolator` Object e.g. `sharp.interpolator.bicubic`.
-
-Possible interpolators, in order of performance, are:
-
-* `bilinear`: Use [bilinear interpolation](http://en.wikipedia.org/wiki/Bilinear_interpolation), the default (and fastest) interpolation.
-* `bicubic`: Use [bicubic interpolation](http://en.wikipedia.org/wiki/Bicubic_interpolation), which typically reduces performance by 5%.
-* `vertexSplitQuadraticBasisSpline`: Use [VSQBS interpolation](https://github.com/jcupitt/libvips/blob/master/libvips/resample/vsqbs.cpp#L48), which prevents "staircasing" when enlarging and typically reduces performance by 5%.
-* `locallyBoundedBicubic`: Use [LBB interpolation](https://github.com/jcupitt/libvips/blob/master/libvips/resample/lbb.cpp#L100), which prevents some "[acutance](http://en.wikipedia.org/wiki/Acutance)" and typically reduces performance by a factor of 2.
-* `nohalo`: Use [Nohalo interpolation](http://eprints.soton.ac.uk/268086/), which prevents acutance and typically reduces performance by a factor of 3.
-
-### Output options
-
-#### progressive()
-
-Use progressive (interlace) scan for JPEG and PNG output. This typically reduces compression performance by 30% but results in an image that can be rendered sooner when decompressed.
-
-#### quality(quality)
-
-The output quality to use for lossy JPEG, WebP and TIFF output formats. The default quality is `80`.
-
-`quality` is a Number between 1 and 100.
-
-#### compressionLevel(compressionLevel)
-
-An advanced setting for the _zlib_ compression level of the lossless PNG output format. The default level is `6`.
-
-`compressionLevel` is a Number between -1 and 9.
-
-#### jpeg()
-
-Use JPEG format for the output image.
-
-#### png()
-
-Use PNG format for the output image.
-
-#### webp()
-
-Use WebP format for the output image.
-
-### Output methods
-
-#### toFile(filename, [callback])
-
-`filename` is a String containing the filename to write the image data to. The format is inferred from the extension, with JPEG, PNG, WebP and TIFF supported.
-
-`callback`, if present, is called with two arguments `(err, info)` where:
-
-* `err` contains an error message, if any
-* `info` contains the final resized image dimensions in its `width` and `height` properties
-
-A Promises/A+ promise is returned when `callback` is not provided.
-
-#### toBuffer([callback])
-
-Write image data to a Buffer, the format of which will match the input image by default. JPEG, PNG and WebP are supported.
-
-`callback`, if present, gets three arguments `(err, buffer, info)` where:
-
-* `err` is an error message, if any
-* `buffer` is the resultant image data
-* `info` contains the final resized image dimensions in its `width` and `height` properties
-
-A Promises/A+ promise is returned when `callback` is not provided.
-
-### Utility methods
-
-#### sharp.cache([memory], [items])
-
-If `memory` or `items` are provided, set the limits of _libvips'_ operation cache.
-
-* `memory` is the maximum memory in MB to use for this cache, with a default value of 100
-* `items` is the maximum number of operations to cache, with a default value of 500
-
-This method always returns cache statistics, useful for determining how much working memory is required for a particular task.
-
-```javascript
-var stats = sharp.cache(); // { current: 75, high: 99, memory: 100, items: 500 }
-sharp.cache(200); // { current: 75, high: 99, memory: 200, items: 500 }
-sharp.cache(50, 200); // { current: 49, high: 99, memory: 50, items: 200}
-```
-
-#### sharp.counters()
-
-Provides access to internal task counters.
-
-* `queue` is the number of tasks this module has queued waiting for _libuv_ to provide a worker thread from its pool.
-* `process` is the number of resize tasks currently being processed.
-
-```javascript
-var counters = sharp.counters(); // { queue: 2, process: 4 }
-```
-
-## Testing
-
-[![Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)
-
-	npm test
-
-Running the tests requires both ImageMagick and GraphicsMagick plus one of either libmagick++-dev or libgraphicsmagick++.
-
-	brew install imagemagick
-	brew install graphicsmagick
-
-	sudo apt-get install imagemagick graphicsmagick libmagick++-dev
-
-## Performance
-
-### Test environment
-
-* Intel Xeon [L5520](http://ark.intel.com/products/40201/Intel-Xeon-Processor-L5520-8M-Cache-2_26-GHz-5_86-GTs-Intel-QPI) 2.27GHz 8MB cache
-* Ubuntu 13.10
-* libvips 7.38.5
-
-### The contenders
-
-* [imagemagick-native](https://github.com/mash/node-imagemagick-native) - Supports Buffers only and blocks main V8 thread whilst processing.
-* [imagemagick](https://github.com/rsms/node-imagemagick) - Supports filesystem only and "has been unmaintained for a long time".
-* [gm](https://github.com/aheckmann/gm) - Fully featured wrapper around GraphicsMagick.
-* sharp - Caching within libvips disabled to ensure a fair comparison.
-
-### The task
-
-Decompress a 2725x2225 JPEG image, resize and crop to 720x480, then compress to JPEG.
-
-### Results
-
-| Module                | Input  | Output | Ops/sec | Speed-up |
-| :-------------------- | :----- | :----- | ------: | -------: |
-| imagemagick-native    | buffer | buffer |    0.97 |        1 |
-| imagemagick           | file   | file   |    2.49 |      2.6 |
-| gm                    | buffer | file   |    3.72 |      3.8 |
-| gm                    | buffer | buffer |    3.80 |      3.9 |
-| gm                    | file   | file   |    3.67 |      3.8 |
-| gm                    | file   | buffer |    3.67 |      3.8 |
-| sharp                 | buffer | file   |   13.62 |     14.0 |
-| sharp                 | buffer | buffer |   12.43 |     12.8 |
-| sharp                 | file   | file   |   13.02 |     13.4 |
-| sharp                 | file   | buffer |   11.15 |     11.5 |
-| sharp +sharpen        | file   | buffer |   10.26 |     10.6 |
-| sharp +progressive    | file   | buffer |    9.44 |      9.7 |
-| sharp +sequentialRead | file   | buffer |   11.94 |     12.3 |
-
-You can expect much greater performance with caching enabled (default) and using 16+ core machines.
-
-## Licence
-
-Copyright 2013, 2014 Lovell Fuller, Pierre Inglebert, Jonathan Ong and Chanon Sajjamanochai
+Copyright 2013, 2014, 2015, 2016 Lovell Fuller and contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
-You may obtain a copy of the License at [http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0.html)
+You may obtain a copy of the License at
+[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0.html)
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,

appveyor.yml

@@ -0,0 +1,15 @@
+os: Visual Studio 2015
+version: "{build}"
+build: off
+platform: x64
+environment:
+  VIPS_WARNING: 0
+  matrix:
+  - nodejs_version: "0.12"
+  - nodejs_version: "4"
+  - nodejs_version: "5"
+install:
+  - ps: Install-Product node $env:nodejs_version x64
+  - npm install
+test_script:
+  - npm run-script test-win

binding.gyp

@@ -1,21 +1,243 @@
 {
   'targets': [{
+    'target_name': 'libvips-cpp',
+    'conditions': [
+      ['OS == "win"', {
+        # Build libvips C++ binding for Windows due to MSVC std library ABI changes
+        'type': 'shared_library',
+        'variables': {
+          'download_vips': '<!(node -e "require(\'./binding\').download_vips()")'
+        },
+        'defines': [
+          'VIPS_CPLUSPLUS_EXPORTS'
+        ],
+        'sources': [
+          'src/libvips/cplusplus/VError.cpp',
+          'src/libvips/cplusplus/VInterpolate.cpp',
+          'src/libvips/cplusplus/VImage.cpp'
+        ],
+        'include_dirs': [
+          '<(module_root_dir)/include',
+          '<(module_root_dir)/include/glib-2.0',
+          '<(module_root_dir)/lib/glib-2.0/include'
+        ],
+        'libraries': [
+          '<(module_root_dir)/lib/libvips.lib',
+          '<(module_root_dir)/lib/libglib-2.0.lib',
+          '<(module_root_dir)/lib/libgobject-2.0.lib'
+        ],
+        'configurations': {
+          'Release': {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'ExceptionHandling': 1
+              }
+            },
+            'msvs_disabled_warnings': [
+              4275
+            ]
+          }
+        }
+      }, {
+        # Ignore this target for non-Windows
+        'type': 'none'
+      }]
+    ]
+  }, {
     'target_name': 'sharp',
-    'sources': ['src/sharp.cc'],
+    'dependencies': [
+      'libvips-cpp'
+    ],
+    # Nested variables "pattern" borrowed from http://src.chromium.org/viewvc/chrome/trunk/src/build/common.gypi
     'variables': {
-      'PKG_CONFIG_PATH': '<!(which brew >/dev/null 2>&1 && eval $(brew --env) && echo $PKG_CONFIG_LIBDIR || true):$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig'
+      'variables': {
+        'variables': {
+          'conditions': [
+            ['OS != "win"', {
+              # Build the PKG_CONFIG_PATH environment variable with all possible combinations
+              'pkg_config_path': '<!(which brew >/dev/null 2>&1 && eval $(brew --env) && echo $PKG_CONFIG_LIBDIR || true):$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig'
+            }, {
+              'pkg_config_path': ''
+            }]
+          ],
+        },
+        'conditions': [
+          ['OS != "win"', {
+            # Which version, if any, of libvips is available globally via pkg-config?
+            'global_vips_version': '<!(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --modversion vips-cpp 2>/dev/null || true)'
+          }, {
+            'global_vips_version': ''
+          }]
+        ],
+        'pkg_config_path%': '<(pkg_config_path)'
+      },
+      'pkg_config_path%': '<(pkg_config_path)',
+      'runtime_link%': 'shared',
+      'conditions': [
+        ['OS != "win"', {
+          # Does the globally available version of libvips, if any, meet the minimum version requirement?
+          'use_global_vips': '<!(GLOBAL_VIPS_VERSION="<(global_vips_version)" node -e "require(\'./binding\').use_global_vips()")'
+        }, {
+          'use_global_vips': ''
+        }]
+      ]
     },
-    'libraries': [
-      '<!(PKG_CONFIG_PATH="<(PKG_CONFIG_PATH)" pkg-config --libs vips)'
+    'sources': [
+      'src/common.cc',
+      'src/metadata.cc',
+      'src/operations.cc',
+      'src/pipeline.cc',
+      'src/sharp.cc',
+      'src/utilities.cc'
+    ],
+    'defines': [
+      '_GLIBCXX_USE_CXX11_ABI=0'
     ],
     'include_dirs': [
-      '<!(PKG_CONFIG_PATH="<(PKG_CONFIG_PATH)" pkg-config --cflags vips glib-2.0)',
       '<!(node -e "require(\'nan\')")'
     ],
-    'cflags': ['-fexceptions', '-Wall', '-O3'],
-    'cflags_cc': ['-std=c++0x', '-fexceptions', '-Wall', '-O3'],
+    'conditions': [
+      ['use_global_vips == "true"', {
+        # Use pkg-config for include and lib
+        'include_dirs': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --cflags-only-I vips-cpp vips glib-2.0 | sed s\/-I//g)'],
+        'conditions': [
+          ['runtime_link == "static"', {
+            'libraries': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs --static vips-cpp)']
+          }, {
+            'libraries': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs vips-cpp)']
+          }]
+        ]
+      }, {
+        # Attempt to download pre-built libvips and install locally within node_modules
+        'include_dirs': [
+          '<(module_root_dir)/include',
+          '<(module_root_dir)/include/glib-2.0',
+          '<(module_root_dir)/lib/glib-2.0/include'
+        ],
+        'conditions': [
+          ['OS == "win"', {
+            'libraries': [
+              '<(module_root_dir)/lib/libvips.lib',
+              '<(module_root_dir)/lib/libglib-2.0.lib',
+              '<(module_root_dir)/lib/libgobject-2.0.lib'
+            ]
+          }],
+          ['OS == "linux"', {
+            'variables': {
+              'download_vips': '<!(LDD_VERSION="<!(ldd --version 2>&1 || true)" node -e "require(\'./binding\').download_vips()")'
+            },
+            'libraries': [
+              '<(module_root_dir)/lib/libvips-cpp.so',
+              '<(module_root_dir)/lib/libvips.so',
+              '<(module_root_dir)/lib/libglib-2.0.so',
+              '<(module_root_dir)/lib/libgobject-2.0.so',
+              # Dependencies of dependencies, included for openSUSE support
+              '<(module_root_dir)/lib/libGraphicsMagick.so',
+              '<(module_root_dir)/lib/libGraphicsMagickWand.so',
+              '<(module_root_dir)/lib/libexif.so',
+              '<(module_root_dir)/lib/libgio-2.0.so',
+              '<(module_root_dir)/lib/libgmodule-2.0.so',
+              '<(module_root_dir)/lib/libgsf-1.so',
+              '<(module_root_dir)/lib/libjpeg.so',
+              '<(module_root_dir)/lib/libpng.so',
+              '<(module_root_dir)/lib/libtiff.so',
+              '<(module_root_dir)/lib/libwebp.so',
+              '<(module_root_dir)/lib/libz.so',
+              '<(module_root_dir)/lib/libffi.so',
+              '<(module_root_dir)/lib/libgthread-2.0.so',
+              '<(module_root_dir)/lib/liblcms2.so',
+              '<(module_root_dir)/lib/libpng16.so',
+              '<(module_root_dir)/lib/libxml2.so',
+              '<(module_root_dir)/lib/liborc-0.4.so',
+              # Ensure runtime linking is relative to sharp.node
+              '-Wl,-rpath=\'$${ORIGIN}/../../lib\''
+            ]
+          }]
+        ]
+      }]
+    ],
+    'cflags_cc': [
+      '-std=c++0x',
+      '-fexceptions',
+      '-Wall',
+      '-O3'
+    ],
     'xcode_settings': {
-      'OTHER_CFLAGS': ['-std=c++11', '-fexceptions', '-Wall', '-O3']
-    }
+      'CLANG_CXX_LANGUAGE_STANDARD': 'c++11',
+      'CLANG_CXX_LIBRARY': 'libc++',
+      'MACOSX_DEPLOYMENT_TARGET': '10.7',
+      'GCC_ENABLE_CPP_EXCEPTIONS': 'YES',
+      'OTHER_CPLUSPLUSFLAGS': [
+        '-fexceptions',
+        '-Wall',
+        '-O3'
+      ]
+    },
+    'configurations': {
+      'Release': {
+        'msvs_settings': {
+          'VCCLCompilerTool': {
+            'ExceptionHandling': 1
+          }
+        },
+        'msvs_disabled_warnings': [
+          4275
+        ]
+      }
+    },
+  }, {
+    'target_name': 'win_copy_dlls',
+    'type': 'none',
+    'dependencies': [
+      'sharp'
+    ],
+    'conditions': [
+      ['OS == "win"', {
+        # Windows lacks support for rpath
+        'copies': [{
+          'destination': '<(module_root_dir)/build/Release',
+          'files': [
+            '<(module_root_dir)/lib/GNU.Gettext.dll',
+            '<(module_root_dir)/lib/libMagickCore-6.Q16-2.dll',
+            '<(module_root_dir)/lib/libMagickWand-6.Q16-2.dll',
+            '<(module_root_dir)/lib/libasprintf-0.dll',
+            '<(module_root_dir)/lib/libcairo-2.dll',
+            '<(module_root_dir)/lib/libcairo-gobject-2.dll',
+            '<(module_root_dir)/lib/libcairo-script-interpreter-2.dll',
+            '<(module_root_dir)/lib/libexif-12.dll',
+            '<(module_root_dir)/lib/libexpat-1.dll',
+            '<(module_root_dir)/lib/libffi-6.dll',
+            '<(module_root_dir)/lib/libfftw3-3.dll',
+            '<(module_root_dir)/lib/libfontconfig-1.dll',
+            '<(module_root_dir)/lib/libfreetype-6.dll',
+            '<(module_root_dir)/lib/libgcc_s_seh-1.dll',
+            '<(module_root_dir)/lib/libgdk_pixbuf-2.0-0.dll',
+            '<(module_root_dir)/lib/libgio-2.0-0.dll',
+            '<(module_root_dir)/lib/libglib-2.0-0.dll',
+            '<(module_root_dir)/lib/libgmodule-2.0-0.dll',
+            '<(module_root_dir)/lib/libgobject-2.0-0.dll',
+            '<(module_root_dir)/lib/libgsf-1-114.dll',
+            '<(module_root_dir)/lib/libgthread-2.0-0.dll',
+            '<(module_root_dir)/lib/libintl-8.dll',
+            '<(module_root_dir)/lib/libjpeg-62.dll',
+            '<(module_root_dir)/lib/liblcms2-2.dll',
+            '<(module_root_dir)/lib/libopenjpeg-1.dll',
+            '<(module_root_dir)/lib/libopenslide-0.dll',
+            '<(module_root_dir)/lib/libpango-1.0-0.dll',
+            '<(module_root_dir)/lib/libpangocairo-1.0-0.dll',
+            '<(module_root_dir)/lib/libpangowin32-1.0-0.dll',
+            '<(module_root_dir)/lib/libpixman-1-0.dll',
+            '<(module_root_dir)/lib/libpng16-16.dll',
+            '<(module_root_dir)/lib/libquadmath-0.dll',
+            '<(module_root_dir)/lib/libsqlite3-0.dll',
+            '<(module_root_dir)/lib/libssp-0.dll',
+            '<(module_root_dir)/lib/libtiff-5.dll',
+            '<(module_root_dir)/lib/libvips-42.dll',
+            '<(module_root_dir)/lib/libxml2-2.dll',
+            '<(module_root_dir)/lib/zlib1.dll'
+          ]
+        }]
+      }]
+    ]
   }]
 }

binding.js

@@ -0,0 +1,131 @@
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+var zlib = require('zlib');
+
+var semver = require('semver');
+var request = require('request');
+var tar = require('tar');
+
+var tmp = require('os').tmpdir();
+
+var distBaseUrl = 'https://dl.bintray.com/lovell/sharp/';
+
+var vipsHeaderPath = path.join(__dirname, 'include', 'vips', 'vips.h');
+
+// -- Helpers
+
+// Does this file exist?
+var isFile = function(file) {
+  var exists = false;
+  try {
+    exists = fs.statSync(file).isFile();
+  } catch (err) {}
+  return exists;
+};
+
+var unpack = function(tarPath, done) {
+  var extractor = tar.Extract({
+    path: __dirname
+  });
+  extractor.on('error', error);
+  extractor.on('end', function() {
+    if (!isFile(vipsHeaderPath)) {
+      error('Could not unpack ' + tarPath);
+    }
+    if (typeof done === 'function') {
+      done();
+    }
+  });
+  fs.createReadStream(tarPath).on('error', error)
+    .pipe(zlib.Unzip())
+    .pipe(extractor);
+};
+
+// Error
+var error = function(msg) {
+  if (msg instanceof Error) {
+    msg = msg.message;
+  }
+  process.stderr.write('ERROR: ' + msg + '\n');
+  process.exit(1);
+};
+
+// -- Binary downloaders
+
+module.exports.download_vips = function() {
+  // Has vips been installed locally?
+  if (!isFile(vipsHeaderPath)) {
+    // Ensure Intel 64-bit or ARM
+    if (process.arch === 'ia32') {
+      error('Intel Architecture 32-bit systems require manual installation - please see http://sharp.dimens.io/en/stable/install/');
+    }
+    // Ensure glibc >= 2.15
+    var lddVersion = process.env.LDD_VERSION;
+    if (lddVersion) {
+      if (/(glibc|gnu libc)/i.test(lddVersion)) {
+        var glibcVersion = lddVersion ? lddVersion.split(/\n/)[0].split(' ').slice(-1)[0].trim() : '';
+        if (glibcVersion && semver.lt(glibcVersion + '.0', '2.13.0')) {
+          error('glibc version ' + glibcVersion + ' requires manual installation - please see http://sharp.dimens.io/en/stable/install/');
+        }
+      } else {
+        error(lddVersion.split(/\n/)[0] + ' requires manual installation - please see http://sharp.dimens.io/en/stable/install/');
+      }
+    }
+    // Arch/platform-specific .tar.gz
+    var platform = (process.arch === 'arm') ? 'arm' : process.platform.substr(0, 3);
+    var tarFilename = ['libvips', process.env.npm_package_config_libvips, platform].join('-') + '.tar.gz';
+    var tarPath = path.join(__dirname, 'packaging', tarFilename);
+    if (isFile(tarPath)) {
+      unpack(tarPath);
+    } else {
+      // Download to per-process temporary file
+      tarPath = path.join(tmp, process.pid + '-' + tarFilename);
+      var tmpFile = fs.createWriteStream(tarPath).on('finish', function() {
+        unpack(tarPath, function() {
+          // Attempt to remove temporary file
+          try {
+            fs.unlinkSync(tarPath);
+          } catch (err) {}
+        });
+      });
+      var options = {
+        url: distBaseUrl + tarFilename
+      };
+      if (process.env.npm_config_https_proxy) {
+        // Use the NPM-configured HTTPS proxy
+        options.proxy = process.env.npm_config_https_proxy;
+      }
+      request(options).on('response', function(response) {
+        if (response.statusCode !== 200) {
+          error(distBaseUrl + tarFilename + ' status code ' + response.statusCode);
+        }
+      }).on('error', function(err) {
+        error('Download from ' + distBaseUrl + tarFilename + ' failed: ' + err.message);
+      }).pipe(tmpFile);
+    }
+  }
+};
+
+module.exports.use_global_vips = function() {
+  var useGlobalVips = false;
+  var globalVipsVersion = process.env.GLOBAL_VIPS_VERSION;
+  if (globalVipsVersion) {
+    useGlobalVips = semver.gte(
+      globalVipsVersion,
+      process.env.npm_package_config_libvips
+    );
+  }
+  if (process.platform === 'darwin' && !useGlobalVips) {
+    if (globalVipsVersion) {
+      error(
+        'Found libvips ' + globalVipsVersion + ' but require ' + process.env.npm_package_config_libvips +
+        '\nPlease upgrade libvips by running: brew update && brew upgrade'
+      );
+    } else {
+      error('Please install libvips by running: brew install homebrew/science/vips --with-webp --with-graphicsmagick');
+    }
+  }
+  process.stdout.write(useGlobalVips ? 'true' : 'false');
+};

circle.yml

@@ -0,0 +1,6 @@
+machine:
+  services:
+    - docker
+test:
+  override:
+    - ./packaging/test.sh

docs/api.md

@@ -0,0 +1,673 @@
+# API
+
+```javascript
+var sharp = require('sharp');
+```
+
+### Input
+
+#### sharp([input], [options])
+
+Constructor to which further methods are chained.
+
+`input`, if present, can be one of:
+
+* Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
+* String containing the path to an image file, with most major formats supported.
+
+JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data
+can be streamed into the object when `input` is `null` or `undefined`.
+
+`options`, if present, is an Object with the following optional attributes:
+
+* `density` an integral number representing the DPI for vector images, defaulting to 72.
+* `raw` an Object containing `width`, `height` and `channels` when providing uncompressed data. See `raw()` for pixel ordering.
+
+The object returned by the constructor implements the
+[stream.Duplex](http://nodejs.org/api/stream.html#stream_class_stream_duplex) class.
+
+JPEG, PNG or WebP format image data can be streamed out from this object.
+
+```javascript
+sharp('input.jpg')
+  .resize(300, 200)
+  .toFile('output.jpg', function(err) {
+    // output.jpg is a 300 pixels wide and 200 pixels high image
+    // containing a scaled and cropped version of input.jpg
+  });
+```
+
+#### metadata([callback])
+
+Fast access to image metadata without decoding any compressed image data.
+
+`callback`, if present, gets the arguments `(err, metadata)` where `metadata` has the attributes:
+
+* `format`: Name of decoder to be used to decompress image data e.g. `jpeg`, `png`, `webp` (for file-based input additionally `tiff`, `magick`, `openslide`, `ppm`, `fits`)
+* `width`: Number of pixels wide
+* `height`: Number of pixels high
+* `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `scrgb`, `cmyk`, `lab`, `xyz`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L522)
+* `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
+* `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](https://www.npmjs.com/package/icc) profile data, if present
+
+A Promises/A+ promise is returned when `callback` is not provided.
+
+```javascript
+var image = sharp(inputJpg);
+image
+  .metadata()
+  .then(function(metadata) {
+    return image
+      .resize(Math.round(metadata.width / 2))
+      .webp()
+      .toBuffer();
+  })
+  .then(function(data) {
+    // data contains a WebP image half the width and height of the original JPEG
+  });
+```
+
+#### clone()
+
+Takes a "snapshot" of the instance, returning a new instance.
+Cloned instances inherit the input of their parent instance.
+
+This allows multiple output Streams
+and therefore multiple processing pipelines
+to share a single input Stream.
+
+```javascript
+var pipeline = sharp().rotate();
+pipeline.clone().resize(800, 600).pipe(firstWritableStream);
+pipeline.clone().extract({ left: 20, top: 20, width: 100, height: 100 }).pipe(secondWritableStream);
+readableStream.pipe(pipeline);
+// firstWritableStream receives auto-rotated, resized readableStream
+// secondWritableStream receives auto-rotated, extracted region of readableStream
+```
+
+#### sequentialRead()
+
+An advanced setting that switches the libvips access method to `VIPS_ACCESS_SEQUENTIAL`.
+This will reduce memory usage and can improve performance on some systems.
+
+#### limitInputPixels(pixels)
+
+Do not process input images where the number of pixels (width * height) exceeds this limit.
+
+`pixels` is the integral Number of pixels, with a value between 1 and the default 268402689 (0x3FFF * 0x3FFF).
+
+### Resizing
+
+#### resize([width], [height])
+
+Scale output to `width` x `height`. By default, the resized image is cropped to the exact size specified.
+
+`width` is the integral Number of pixels wide the resultant image should be, between 1 and 16383 (0x3FFF). Use `null` or `undefined` to auto-scale the width to match the height.
+
+`height` is the integral Number of pixels high the resultant image should be, between 1 and 16383. Use `null` or `undefined` to auto-scale the height to match the width.
+
+#### crop([gravity])
+
+Crop the resized image to the exact size specified, the default behaviour.
+
+`gravity`, if present, is a String or an attribute of the `sharp.gravity` Object e.g. `sharp.gravity.north`.
+
+Possible values are `north`, `northeast`, `east`, `southeast`, `south`, `southwest`, `west`, `northwest`, `center` and `centre`.
+The default gravity is `center`/`centre`.
+
+```javascript
+var transformer = sharp()
+  .resize(300, 200)
+  .crop(sharp.gravity.north)
+  .on('error', function(err) {
+    console.log(err);
+  });
+// Read image data from readableStream, resize and write image data to writableStream
+readableStream.pipe(transformer).pipe(writableStream);
+```
+
+#### embed()
+
+Preserving aspect ratio, resize the image to the
+maximum `width` or `height` specified
+then embed on a background of the exact
+`width` and `height` specified.
+
+If the background contains an alpha value
+then WebP and PNG format output images will
+contain an alpha channel,
+even when the input image does not.
+
+```javascript
+sharp('input.gif')
+  .resize(200, 300)
+  .background({r: 0, g: 0, b: 0, a: 0})
+  .embed()
+  .toFormat(sharp.format.webp)
+  .toBuffer(function(err, outputBuffer) {
+    if (err) {
+      throw err;
+    }
+    // outputBuffer contains WebP image data of a 200 pixels wide and 300 pixels high
+    // containing a scaled version, embedded on a transparent canvas, of input.gif
+  });
+```
+
+#### max()
+
+Preserving aspect ratio,
+resize the image to be as large as possible
+while ensuring its dimensions are less than or equal to
+the `width` and `height` specified.
+
+Both `width` and `height` must be provided via
+`resize` otherwise the behaviour will default to `crop`.
+
+```javascript
+sharp(inputBuffer)
+  .resize(200, 200)
+  .max()
+  .toFormat('jpeg')
+  .toBuffer()
+  .then(function(outputBuffer) {
+    // outputBuffer contains JPEG image data no wider than 200 pixels and no higher
+    // than 200 pixels regardless of the inputBuffer image dimensions
+  });
+```
+
+#### min()
+
+Preserving aspect ratio,
+resize the image to be as small as possible
+while ensuring its dimensions are greater than or equal to
+the `width` and `height` specified.
+
+Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
+
+#### withoutEnlargement()
+
+Do not enlarge the output image
+if the input image width *or* height
+are already less than the required dimensions.
+
+This is equivalent to GraphicsMagick's `>` geometry option:
+"*change the dimensions of the image only
+if its width or height exceeds the geometry specification*".
+
+#### ignoreAspectRatio()
+
+Ignoring the aspect ratio of the input, stretch the image to the exact `width` and/or `height` provided via `resize`.
+
+#### interpolateWith(interpolator)
+
+Use the given interpolator for image resizing, where `interpolator` is an attribute of the `sharp.interpolator` Object e.g. `sharp.interpolator.bicubic`.
+
+The default interpolator is `bicubic`, providing a general-purpose interpolator that is both fast and of good quality.
+
+Possible interpolators, in order of performance, are:
+
+* `nearest`: Use [nearest neighbour interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation), suitable for image enlargement only.
+* `bilinear`: Use [bilinear interpolation](http://en.wikipedia.org/wiki/Bilinear_interpolation), faster than bicubic but with less smooth results.
+* `vertexSplitQuadraticBasisSpline`: Use the smoother [VSQBS interpolation](https://github.com/jcupitt/libvips/blob/master/libvips/resample/vsqbs.cpp#L48) to prevent "staircasing" when enlarging.
+* `bicubic`: Use [bicubic interpolation](http://en.wikipedia.org/wiki/Bicubic_interpolation) (the default).
+* `locallyBoundedBicubic`: Use [LBB interpolation](https://github.com/jcupitt/libvips/blob/master/libvips/resample/lbb.cpp#L100), which prevents some "[acutance](http://en.wikipedia.org/wiki/Acutance)" but typically reduces performance by a factor of 2.
+* `nohalo`: Use [Nohalo interpolation](http://eprints.soton.ac.uk/268086/), which prevents acutance but typically reduces performance by a factor of 3.
+
+[Compare the output of these interpolators](https://github.com/lovell/sharp/tree/master/test/interpolators)
+
+```javascript
+sharp(inputBuffer)
+  .resize(200, 300)
+  .interpolateWith(sharp.interpolator.nohalo)
+  .background('white')
+  .embed()
+  .toFile('output.tiff')
+  .then(function() {
+    // output.tiff is a 200 pixels wide and 300 pixels high image
+    // containing a nohalo scaled version, embedded on a white canvas,
+    // of the image data in inputBuffer
+  });
+```
+
+### Operations
+
+#### extract({ left: left, top: top, width: width, height: height })
+
+Extract a region of the image. Can be used with or without a `resize` operation.
+
+`left` and `top` are the offset, in pixels, from the top-left corner.
+
+`width` and `height` are the dimensions of the extracted image.
+
+Use `extract` before `resize` for pre-resize extraction. Use `extract` after `resize` for post-resize extraction. Use `extract` before and after for both.
+
+```javascript
+sharp(input)
+  .extract({ left: left, top: top, width: width, height: height })
+  .toFile(output, function(err) {
+    // Extract a region of the input image, saving in the same format.
+  });
+```
+
+```javascript
+sharp(input)
+  .extract({ left: leftOffsetPre, top: topOffsetPre, width: widthPre, height: heightPre })
+  .resize(width, height)
+  .extract({ left: leftOffsetPost, top: topOffsetPost, width: widthPost, height: heightPost })
+  .toFile(output, function(err) {
+    // Extract a region, resize, then extract from the resized image
+  });
+```
+
+#### background(rgba)
+
+Set the background for the `embed` and `flatten` operations.
+
+`rgba` is parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+
+The alpha value is a float between `0` (transparent) and `1` (opaque).
+
+The default background is `{r: 0, g: 0, b: 0, a: 1}`, black without transparency.
+
+#### flatten()
+
+Merge alpha transparency channel, if any, with `background`.
+
+#### negate()
+
+Produces the "negative" of the image.  White => Black, Black => White, Blue => Yellow, etc.
+
+#### rotate([angle])
+
+Rotate the output image by either an explicit angle or auto-orient based on the EXIF `Orientation` tag.
+
+`angle`, if present, is a Number with a value of `0`, `90`, `180` or `270`.
+
+Use this method without `angle` to determine the angle from EXIF data. Mirroring is supported and may infer the use of a `flip` operation.
+
+Method order is important when both rotating and extracting regions, for example `rotate(x).extract(y)` will produce a different result to `extract(y).rotate(x)`.
+
+The use of `rotate` implies the removal of the EXIF `Orientation` tag, if any.
+
+```javascript
+var pipeline = sharp()
+  .rotate()
+  .resize(null, 200)
+  .progressive()
+  .toBuffer(function(err, outputBuffer, info) {
+    if (err) {
+      throw err;
+    }
+    // outputBuffer contains 200px high progressive JPEG image data,
+    // auto-rotated using EXIF Orientation tag
+    // info.width and info.height contain the dimensions of the resized image
+  });
+readableStream.pipe(pipeline);
+```
+
+#### flip()
+
+Flip the image about the vertical Y axis. This always occurs after rotation, if any.
+The use of `flip` implies the removal of the EXIF `Orientation` tag, if any.
+
+#### flop()
+
+Flop the image about the horizontal X axis. This always occurs after rotation, if any.
+The use of `flop` implies the removal of the EXIF `Orientation` tag, if any.
+
+#### blur([sigma])
+
+When used without parameters, performs a fast, mild blur of the output image. This typically reduces performance by 10%.
+
+When a `sigma` is provided, performs a slower, more accurate Gaussian blur. This typically reduces performance by 25%.
+
+* `sigma`, if present, is a Number between 0.3 and 1000 representing the approximate blur radius in pixels.
+
+#### sharpen([radius], [flat], [jagged])
+
+When used without parameters, performs a fast, mild sharpen of the output image. This typically reduces performance by 10%.
+
+When a `radius` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space. Separate control over the level of sharpening in "flat" and "jagged" areas is available. This typically reduces performance by 50%.
+
+* `radius`, if present, is an integral Number representing the sharpen mask radius in pixels.
+* `flat`, if present, is a Number representing the level of sharpening to apply to "flat" areas, defaulting to a value of 1.0.
+* `jagged`, if present, is a Number representing the level of sharpening to apply to "jagged" areas, defaulting to a value of 2.0.
+
+#### threshold([threshold])
+
+Converts all pixels in the image to greyscale white or black.  Any pixel greather-than-or-equal-to the threshold (0..255) will be white.  All others will be black.
+
+* `threshold`, if present, is a Number, representing the level above which pixels will be forced to white.
+
+#### gamma([gamma])
+
+Apply a gamma correction by reducing the encoding (darken) pre-resize at a factor of `1/gamma` then increasing the encoding (brighten) post-resize at a factor of `gamma`.
+
+`gamma`, if present, is a Number between 1 and 3. The default value is `2.2`, a suitable approximation for sRGB images.
+
+This can improve the perceived brightness of a resized image in non-linear colour spaces.
+
+JPEG input images will not take advantage of the shrink-on-load performance optimisation when applying a gamma correction.
+
+#### grayscale() / greyscale()
+
+Convert to 8-bit greyscale; 256 shades of grey.
+
+This is a linear operation. If the input image is in a non-linear colour space such as sRGB, use `gamma()` with `greyscale()` for the best results.
+
+The output image will still be web-friendly sRGB and contain three (identical) channels.
+
+#### normalize() / normalise()
+
+Enhance output image contrast by stretching its luminance to cover the full dynamic range. This typically reduces performance by 30%.
+
+#### overlayWith(path)
+
+_Experimental_
+
+Alpha composite image at `path` over the processed (resized, extracted) image. The dimensions of the two images must match.
+
+* `path` is a String containing the path to an image file with an alpha channel.
+
+```javascript
+sharp('input.png')
+  .rotate(180)
+  .resize(300)
+  .flatten()
+  .background('#ff6600')
+  .overlayWith('overlay.png')
+  .sharpen()
+  .withMetadata()
+  .quality(90)
+  .webp()
+  .toBuffer()
+  .then(function(outputBuffer) {
+    // outputBuffer contains upside down, 300px wide, alpha channel flattened
+    // onto orange background, composited with overlay.png, sharpened,
+    // with metadata, 90% quality WebP image data. Phew!
+  });
+```
+
+### Output
+
+#### toFile(path, [callback])
+
+`path` is a String containing the path to write the image data to.
+
+If an explicit output format is not selected, it will be inferred from the extension, with JPEG, PNG, WebP, TIFF and DZI supported.
+
+`callback`, if present, is called with two arguments `(err, info)` where:
+
+* `err` contains an error message, if any.
+* `info` contains the output image `format`, `size` (bytes), `width`, `height` and `channels`.
+
+A Promises/A+ promise is returned when `callback` is not provided.
+
+#### toBuffer([callback])
+
+Write image data to a Buffer, the format of which will match the input image by default. JPEG, PNG and WebP are supported.
+
+`callback`, if present, gets three arguments `(err, buffer, info)` where:
+
+* `err` is an error message, if any.
+* `buffer` is the output image data.
+* `info` contains the output image `format`, `size` (bytes), `width`, `height` and `channels`.
+
+A Promises/A+ promise is returned when `callback` is not provided.
+
+#### jpeg()
+
+Use JPEG format for the output image.
+
+#### png()
+
+Use PNG format for the output image.
+
+#### webp()
+
+Use WebP format for the output image.
+
+#### raw()
+
+Provide raw, uncompressed uint8 (unsigned char) image data for Buffer and Stream based output.
+
+The number of channels depends on the input image and selected options.
+
+* 1 channel for images converted to `greyscale()`, with each byte representing one pixel.
+* 3 channels for colour images without alpha transparency, with bytes ordered \[red, green, blue, red, green, blue, etc.\]).
+* 4 channels for colour images with alpha transparency, with bytes ordered \[red, green, blue, alpha, red, green, blue, alpha, etc.\].
+
+#### toFormat(format)
+
+Convenience method for the above output format methods, where `format` is either:
+
+* an attribute of the `sharp.format` Object e.g. `sharp.format.jpeg`, or
+* a String containing `jpeg`, `png`, `webp` or `raw`.
+
+#### quality(quality)
+
+The output quality to use for lossy JPEG, WebP and TIFF output formats. The default quality is `80`.
+
+`quality` is a Number between 1 and 100.
+
+#### progressive()
+
+Use progressive (interlace) scan for JPEG and PNG output. This typically reduces compression performance by 30% but results in an image that can be rendered sooner when decompressed.
+
+#### withMetadata([metadata])
+
+Include all metadata (EXIF, XMP, IPTC) from the input image in the output image.
+This will also convert to and add the latest web-friendly v2 sRGB ICC profile.
+
+The optional `metadata` parameter, if present, is an Object with the attributes to update.
+New attributes cannot be inserted, only existing attributes updated.
+
+* `orientation` is an integral Number between 0 and 7, used to update the value of the EXIF `Orientation` tag.
+This has no effect if the input image does not have an EXIF `Orientation` tag.
+
+The default behaviour, when `withMetadata` is not used, is to strip all metadata and convert to the device-independent sRGB colour space.
+
+#### tile([size], [overlap])
+
+The size and overlap, in pixels, of square Deep Zoom image pyramid tiles.
+
+* `size` is an integral Number between 1 and 8192. The default value is 256 pixels.
+* `overlap` is an integral Number between 0 and 8192. The default value is 0 pixels.
+
+```javascript
+sharp('input.tiff').tile(256).toFile('output.dzi', function(err, info) {
+  // The output.dzi file is the XML format Deep Zoom definition
+  // The output_files directory contains 256x256 pixel tiles grouped by zoom level
+});
+```
+
+#### withoutChromaSubsampling()
+
+Disable the use of [chroma subsampling](http://en.wikipedia.org/wiki/Chroma_subsampling) with JPEG output (4:4:4).
+
+This can improve colour representation at higher quality settings (90+),
+but usually increases output file size and typically reduces performance by 25%.
+
+The default behaviour is to use chroma subsampling (4:2:0).
+
+#### compressionLevel(compressionLevel)
+
+An advanced setting for the _zlib_ compression level of the lossless PNG output format. The default level is `6`.
+
+`compressionLevel` is a Number between 0 and 9.
+
+#### withoutAdaptiveFiltering()
+
+An advanced setting to disable adaptive row filtering for the lossless PNG output format.
+
+#### trellisQuantisation() / trellisQuantization()
+
+_Requires libvips to have been compiled with mozjpeg support_
+
+An advanced setting to apply the use of
+[trellis quantisation](http://en.wikipedia.org/wiki/Trellis_quantization) with JPEG output.
+Reduces file size and slightly increases relative quality at the cost of increased compression time.
+
+#### overshootDeringing()
+
+_Requires libvips to have been compiled with mozjpeg support_
+
+An advanced setting to reduce the effects of
+[ringing](http://en.wikipedia.org/wiki/Ringing_%28signal%29) in JPEG output,
+in particular where black text appears on a white background (or vice versa).
+
+#### optimiseScans() / optimizeScans()
+
+_Requires libvips to have been compiled with mozjpeg support_
+
+An advanced setting for progressive (interlace) JPEG output.
+Calculates which spectrum of DCT coefficients uses the fewest bits.
+Usually reduces file size at the cost of increased compression time.
+
+### Attributes
+
+#### format
+
+An Object containing nested boolean values
+representing the available input and output formats/methods,
+for example:
+
+```javascript
+> console.dir(sharp.format);
+
+{ jpeg: { id: 'jpeg',
+    input: { file: true, buffer: true, stream: true },
+    output: { file: true, buffer: true, stream: true } },
+  png: { id: 'png',
+    input: { file: true, buffer: true, stream: true },
+    output: { file: true, buffer: true, stream: true } },
+  webp: { id: 'webp',
+    input: { file: true, buffer: true, stream: true },
+    output: { file: true, buffer: true, stream: true } },
+  tiff: { id: 'tiff',
+    input: { file: true, buffer: true, stream: true },
+    output: { file: true, buffer: false, stream: false } },
+  magick: { id: 'magick',
+    input: { file: true, buffer: true, stream: true },
+    output: { file: false, buffer: false, stream: false } },
+  raw: { id: 'raw',
+    input: { file: false, buffer: false, stream: false },
+    output: { file: false, buffer: true, stream: true } } }
+```
+
+#### queue
+
+An EventEmitter that emits a `change` event when a task is either:
+
+* queued, waiting for _libuv_ to provide a worker thread
+* complete
+
+```javascript
+sharp.queue.on('change', function(queueLength) {
+  console.log('Queue contains ' + queueLength + ' task(s)');
+});
+```
+
+#### versions
+
+An Object containing the version numbers of libvips and, on Linux, its dependencies.
+
+```javascript
+> console.log(sharp.versions);
+
+{ zlib: '1.2.8',
+  ffi: '3.2.1',
+  glib: '2.46.2',
+  xml: '2.9.2',
+  gsf: '1.14.34',
+  exif: '0.6.21',
+  jpeg: '1.4.2',
+  png: '1.6.19',
+  lcms: '2.7',
+  webp: '0.4.4',
+  tiff: '4.0.6',
+  magick: '6.9.2-6',
+  orc: '0.4.24',
+  vips: '8.1.1' }
+```
+
+### Utilities
+
+#### sharp.cache([options])
+
+If `options` is provided, sets the limits of _libvips'_ operation cache.
+
+* `options.memory` is the maximum memory in MB to use for this cache, with a default value of 50
+* `options.files` is the maximum number of files to hold open, with a default value of 20
+* `options.items` is the maximum number of operations to cache, with a default value of 100
+
+`options` can also be a boolean, where `true` enables the default cache settings and `false` disables all caching.
+
+This method always returns cache statistics, useful for determining how much working memory is required for a particular task.
+
+```javascript
+var stats = sharp.cache();
+```
+
+```javascript
+sharp.cache( { items: 200 } );
+sharp.cache( { files: 0 } );
+sharp.cache(false);
+```
+
+#### sharp.concurrency([threads])
+
+`threads`, if provided, is the Number of threads _libvips'_ should create for processing each image. The default value is the number of CPU cores. A value of `0` will reset to this default.
+
+This method always returns the current concurrency.
+
+```javascript
+var threads = sharp.concurrency(); // 4
+sharp.concurrency(2); // 2
+sharp.concurrency(0); // 4
+```
+
+The maximum number of images that can be processed in parallel is limited by libuv's `UV_THREADPOOL_SIZE` environment variable.
+
+#### sharp.counters()
+
+Provides access to internal task counters.
+
+* `queue` is the number of tasks this module has queued waiting for _libuv_ to provide a worker thread from its pool.
+* `process` is the number of resize tasks currently being processed.
+
+```javascript
+var counters = sharp.counters(); // { queue: 2, process: 4 }
+```
+
+#### sharp.simd([enable])
+
+_Requires libvips to have been compiled with liborc support_
+
+Improves the performance of `resize`, `blur` and `sharpen` operations
+by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM NEON.
+
+* `enable`, if present, is a boolean where `true` enables and `false` disables the use of SIMD.
+
+This method always returns the current state.
+
+This feature is currently disabled by default
+but future versions may enable it by default.
+
+When enabled, versions of liborc prior to 0.4.24
+and versions of libvips prior to 8.2.0
+have been known to crash under heavy load.
+
+```javascript
+var simd = sharp.simd();
+// simd is `true` if SIMD is currently enabled
+```
+
+```javascript
+var simd = sharp.simd(true);
+// attempts to enable the use of SIMD, returning true if available
+```

docs/changelog.md

@@ -0,0 +1,217 @@
+# Changelog
+
+### v0.13 - "*mind*"
+
+#### v0.13.0 - 15<sup>th</sup> February 2016
+
+* Improve vector image support by allowing control of density/DPI.
+  Switch pre-built libs from Imagemagick to Graphicsmagick.
+  [#110](https://github.com/lovell/sharp/issues/110)
+  [@bradisbell](https://github.com/bradisbell)
+
+* Add support for raw, uncompressed pixel Buffer/Stream input.
+  [#220](https://github.com/lovell/sharp/issues/220)
+  [@mikemorris](https://github.com/mikemorris)
+
+* Switch from libvips' C to C++ bindings, requires upgrade to v8.2.2.
+  [#299](https://github.com/lovell/sharp/issues/299)
+
+* Control number of open files in libvips' cache; breaks existing `cache` behaviour.
+  [#315](https://github.com/lovell/sharp/issues/315)
+  [@impomezia](https://github.com/impomezia)
+
+* Ensure 16-bit input images can be normalised and embedded onto transparent backgrounds.
+  [#339](https://github.com/lovell/sharp/issues/339)
+  [#340](https://github.com/lovell/sharp/issues/340)
+  [@janaz](https://github.com/janaz)
+
+* Ensure selected format takes precedence over any unknown output filename extension.
+  [#344](https://github.com/lovell/sharp/issues/344)
+  [@ubaltaci](https://github.com/ubaltaci)
+
+* Add support for libvips' PBM, PGM, PPM and FITS image format loaders.
+  [#347](https://github.com/lovell/sharp/issues/347)
+  [@oaleynik](https://github.com/oaleynik)
+
+* Ensure default crop gravity is center/centre.
+  [#351](https://github.com/lovell/sharp/pull/351)
+  [@joelmukuthu](https://github.com/joelmukuthu)
+
+* Improve support for musl libc systems e.g. Alpine Linux.
+  [#354](https://github.com/lovell/sharp/issues/354)
+  [#359](https://github.com/lovell/sharp/pull/359)
+  [@download13](https://github.com/download13)
+  [@wjordan](https://github.com/wjordan)
+
+* Small optimisation when reducing by an integral factor to favour shrink over affine.
+
+* Add support for gamma correction of images with an alpha channel.
+
+### v0.12 - "*look*"
+
+#### v0.12.2 - 16<sup>th</sup> January 2016
+
+* Upgrade libvips to v8.2.0 for improved vips_shrink.
+
+* Add pre-compiled libvips for ARMv6+ CPUs.
+
+* Ensure 16-bit input images work with embed option.
+  [#325](https://github.com/lovell/sharp/issues/325)
+  [@janaz](https://github.com/janaz)
+
+* Allow compilation with gmake to provide FreeBSD support.
+  [#326](https://github.com/lovell/sharp/issues/326)
+  [@c0decafe](https://github.com/c0decafe)
+
+* Attempt to remove temporary file after installation.
+  [#331](https://github.com/lovell/sharp/issues/331)
+  [@dtoubelis](https://github.com/dtoubelis)
+
+#### v0.12.1 - 12<sup>th</sup> December 2015
+
+* Allow use of SIMD vector instructions (via liborc) to be toggled on/off.
+  [#172](https://github.com/lovell/sharp/issues/172)
+  [@bkw](https://github.com/bkw)
+  [@puzrin](https://github.com/puzrin)
+
+* Ensure embedded ICC profiles output with perceptual intent.
+  [#321](https://github.com/lovell/sharp/issues/321)
+  [@vlapo](https://github.com/vlapo)
+
+* Use the NPM-configured HTTPS proxy, if any, for binary downloads.
+
+#### v0.12.0 - 23<sup>rd</sup> November 2015
+
+* Bundle pre-compiled libvips and its dependencies for 64-bit Linux and Windows.
+  [#42](https://github.com/lovell/sharp/issues/42)
+
+* Take advantage of libvips v8.1.0+ features.
+  [#152](https://github.com/lovell/sharp/issues/152)
+
+* Add support for 64-bit Windows. Drop support for 32-bit Windows.
+  [#224](https://github.com/lovell/sharp/issues/224)
+  [@sabrehagen](https://github.com/sabrehagen)
+
+* Switch default interpolator to bicubic.
+  [#289](https://github.com/lovell/sharp/issues/289)
+  [@mahnunchik](https://github.com/mahnunchik)
+
+* Pre-extract rotatation should not swap width/height.
+  [#296](https://github.com/lovell/sharp/issues/296)
+  [@asilvas](https://github.com/asilvas)
+
+* Ensure 16-bit+alpha input images are (un)premultiplied correctly.
+  [#301](https://github.com/lovell/sharp/issues/301)
+  [@izaakschroeder](https://github.com/izaakschroeder)
+
+* Add `threshold` operation.
+  [#303](https://github.com/lovell/sharp/pull/303)
+  [@dacarley](https://github.com/dacarley)
+
+* Add `negate` operation.
+  [#306](https://github.com/lovell/sharp/pull/306)
+  [@dacarley](https://github.com/dacarley)
+
+* Support `options` Object with existing `extract` operation.
+  [#309](https://github.com/lovell/sharp/pull/309)
+  [@papandreou](https://github.com/papandreou)
+
+### v0.11 - "*knife*"
+
+#### v0.11.4 - 5<sup>th</sup> November 2015
+
+* Add corners, e.g. `northeast`, to existing `gravity` option.
+  [#291](https://github.com/lovell/sharp/pull/291)
+  [@brandonaaron](https://github.com/brandonaaron)
+
+* Ensure correct auto-rotation for EXIF Orientation values 2 and 4.
+  [#288](https://github.com/lovell/sharp/pull/288)
+  [@brandonaaron](https://github.com/brandonaaron)
+
+* Make static linking possible via `--runtime_link` install option.
+  [#287](https://github.com/lovell/sharp/pull/287)
+  [@vlapo](https://github.com/vlapo)
+
+#### v0.11.3 - 8<sup>th</sup> September 2015
+
+* Intrepret blurSigma, sharpenFlat, and sharpenJagged as double precision.
+  [#263](https://github.com/lovell/sharp/pull/263)
+  [@chrisriley](https://github.com/chrisriley)
+
+#### v0.11.2 - 28<sup>th</sup> August 2015
+
+* Allow crop gravity to be provided as a String.
+  [#255](https://github.com/lovell/sharp/pull/255)
+  [@papandreou](https://github.com/papandreou)
+* Add support for io.js v3 and Node v4.
+  [#246](https://github.com/lovell/sharp/issues/246)
+
+#### v0.11.1 - 12<sup>th</sup> August 2015
+
+* Silence MSVC warning: "C4530: C++ exception handler used, but unwind semantics are not enabled".
+  [#244](https://github.com/lovell/sharp/pull/244)
+  [@TheThing](https://github.com/TheThing)
+
+* Suppress gamma correction for input image with alpha transparency.
+  [#249](https://github.com/lovell/sharp/issues/249)
+  [@compeak](https://github.com/compeak)
+
+#### v0.11.0 - 15<sup>th</sup> July 2015
+
+* Allow alpha transparency compositing via new `overlayWith` method.
+  [#97](https://github.com/lovell/sharp/issues/97)
+  [@gasi](https://github.com/gasi)
+
+* Expose raw ICC profile data as a Buffer when using `metadata`.
+  [#129](https://github.com/lovell/sharp/issues/129)
+  [@homerjam](https://github.com/homerjam)
+
+* Allow image header updates via a parameter passed to existing `withMetadata` method.
+  Provide initial support for EXIF `Orientation` tag,
+  which if present is now removed when using `rotate`, `flip` or `flop`.
+  [#189](https://github.com/lovell/sharp/issues/189)
+  [@h2non](https://github.com/h2non)
+
+* Tighten constructor parameter checks.
+  [#221](https://github.com/lovell/sharp/issues/221)
+  [@mikemorris](https://github.com/mikemorris)
+
+* Allow one input Stream to be shared with two or more output Streams via new `clone` method.
+  [#235](https://github.com/lovell/sharp/issues/235)
+  [@jaubourg](https://github.com/jaubourg)
+
+* Use `round` instead of `floor` when auto-scaling dimensions to avoid floating-point rounding errors.
+  [#238](https://github.com/lovell/sharp/issues/238)
+  [@richardadjogah](https://github.com/richardadjogah)
+
+### v0.10 - "*judgment*"
+
+#### v0.10.1 - 1<sup>st</sup> June 2015
+
+* Allow embed of image with alpha transparency onto non-transparent background.
+  [#204](https://github.com/lovell/sharp/issues/204)
+  [@mikemliu](https://github.com/mikemliu)
+
+* Include C standard library for `atoi` as Xcode 6.3 appears to no longer do this.
+  [#228](https://github.com/lovell/sharp/issues/228)
+  [@doggan](https://github.com/doggan)
+
+#### v0.10.0 - 23<sup>rd</sup> April 2015
+
+* Add support for Windows (x86).
+  [#19](https://github.com/lovell/sharp/issues/19)
+  [@DullReferenceException](https://github.com/DullReferenceException)
+  [@itsananderson](https://github.com/itsananderson)
+
+* Add support for Openslide input and DeepZoom output.
+  [#146](https://github.com/lovell/sharp/issues/146)
+  [@mvictoras](https://github.com/mvictoras)
+
+* Allow arbitrary aspect ratios when resizing images via new `ignoreAspectRatio` method.
+  [#192](https://github.com/lovell/sharp/issues/192)
+  [@skedastik](https://github.com/skedastik)
+
+* Enhance output image contrast by stretching its luminance to cover the full dynamic range via new `normalize` method.
+  [#194](https://github.com/lovell/sharp/issues/194)
+  [@bkw](https://github.com/bkw)
+  [@codingforce](https://github.com/codingforce)

docs/index.md

@@ -0,0 +1,108 @@
+# sharp
+
+The typical use case for this high speed Node.js module
+is to convert large images of many formats to
+smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
+
+Resizing an image is typically 4x faster than using the
+quickest ImageMagick and GraphicsMagick settings.
+
+Colour spaces, embedded ICC profiles and alpha transparency channels are all handled correctly.
+Bicubic interpolation with Lanczos anti-alias filtering ensures quality is not sacrificed for speed.
+
+As well as image resizing, operations such as
+rotation, extraction, compositing and gamma correction are available.
+
+Most Windows (x64), Linux and ARMv6+ systems do not require
+the installation of any external runtime dependencies.
+
+Use with OS X is as simple as running `brew install homebrew/science/vips`
+to install the libvips dependency.
+
+[![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.png?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)
+
+### Formats
+
+This module supports reading JPEG, PNG, WebP, TIFF, OpenSlide,
+GIF and most other libmagick-supported formats.
+
+Output images can be in JPEG, PNG and WebP formats as well as uncompressed raw pixel data.
+
+Streams, Buffer objects and the filesystem can be used for input and output.
+
+A single input Stream can be split into multiple processing pipelines and output Streams.
+
+Deep Zoom image pyramids can be generated,
+suitable for use with "slippy map" tile viewers like
+[OpenSeadragon](https://github.com/openseadragon/openseadragon)
+and [Leaflet](https://github.com/turban/Leaflet.Zoomify).
+
+### Fast
+
+This module is powered by the blazingly fast
+[libvips](https://github.com/jcupitt/libvips) image processing library,
+originally created in 1989 at Birkbeck College
+and currently maintained by
+[John Cupitt](https://github.com/jcupitt).
+
+Only small regions of uncompressed image data
+are held in memory and processed at a time,
+taking full advantage of multiple CPU cores and L1/L2/L3 cache.
+
+Everything remains non-blocking thanks to _libuv_,
+no child processes are spawned and Promises/A+ are supported.
+
+### Optimal
+
+Huffman tables are optimised when generating JPEG output images
+without having to use separate command line tools like
+[jpegoptim](https://github.com/tjko/jpegoptim) and
+[jpegtran](http://jpegclub.org/jpegtran/).
+
+PNG filtering can be disabled,
+which for diagrams and line art often produces the same result
+as [pngcrush](http://pmt.sourceforge.net/pngcrush/).
+
+### Contributing
+
+A [guide for contributors](https://github.com/lovell/sharp/blob/master/CONTRIBUTING.md)
+covers reporting bugs, requesting features and submitting code changes.
+
+### Credits
+
+This module would never have been possible without
+the help and code contributions of the following people:
+
+* [John Cupitt](https://github.com/jcupitt)
+* [Pierre Inglebert](https://github.com/pierreinglebert)
+* [Jonathan Ong](https://github.com/jonathanong)
+* [Chanon Sajjamanochai](https://github.com/chanon)
+* [Juliano Julio](https://github.com/julianojulio)
+* [Daniel Gasienica](https://github.com/gasi)
+* [Julian Walker](https://github.com/julianwa)
+* [Amit Pitaru](https://github.com/apitaru)
+* [Brandon Aaron](https://github.com/brandonaaron)
+* [Andreas Lind](https://github.com/papandreou)
+* [Maurus Cuelenaere](https://github.com/mcuelenaere)
+* [Linus Unnebäck](https://github.com/LinusU)
+* [Victor Mateevitsi](https://github.com/mvictoras)
+* [Alaric Holloway](https://github.com/skedastik)
+* [Bernhard K. Weisshuhn](https://github.com/bkw)
+* [David A. Carley](https://github.com/dacarley)
+
+Thank you!
+
+### Licence
+
+Copyright 2013, 2014, 2015 Lovell Fuller and contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0.html)
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

docs/install.md

@@ -0,0 +1,119 @@
+# Installation
+
+```sh
+npm install sharp
+```
+
+### Prerequisites
+
+* C++11 compatible compiler such as gcc 4.6+ (Node v4+ requires gcc 4.8+), clang 3.0+ or MSVC 2013
+* [node-gyp](https://github.com/TooTallNate/node-gyp#installation)
+
+### Linux
+
+[![Ubuntu 14.04 Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)
+[![Linux Build Status](https://circleci.com/gh/lovell/sharp.svg?style=svg&circle-token=6cb6d1d287a51af83722b19ed8885377fbc85e5c)](https://circleci.com/gh/lovell/sharp)
+
+libvips and its dependencies are fetched and stored within `node_modules/sharp` during `npm install`.
+This involves an automated HTTPS download of approximately 6MB.
+
+Most recent Linux-based operating systems with glibc running on x64 and ARMv6+ CPUs should "just work", e.g.:
+
+* Debian 7, 8
+* Ubuntu 12.04, 14.04, 14.10, 15.04, 15.10
+* Centos 7
+* Fedora 21, 22, 23
+* openSUSE 13.2
+* Archlinux 2015.06.01
+* Raspbian Jessie
+
+Preference will be given to an existing globally-installed (via `pkg-config`)
+version of libvips that meets the minimum version requirement.
+This allows the use of newer versions of libvips with older versions of sharp.
+
+For older Linux-based operating systems and 32-bit Intel CPUs,
+a system-wide installation of the most suitable version of
+libvips and its dependencies can be achieved by running
+the following command as a user with `sudo` access
+(requires `curl` and `pkg-config`):
+
+```sh
+curl -s https://raw.githubusercontent.com/lovell/sharp/master/preinstall.sh | sudo bash -
+```
+
+For Linux-based operating systems such as Alpine that use musl libc,
+the smaller stack size means libvips' cache should be disabled
+via `sharp.cache(false)` to avoid a stack overflow.
+
+### Mac OS
+
+[![OS X 10.9.5 Build Status](https://travis-ci.org/lovell/sharp-osx-ci.png?branch=master)](https://travis-ci.org/lovell/sharp-osx-ci)
+
+libvips must be installed before `npm install` is run.
+This can be achieved via homebrew:
+
+```sh
+brew install homebrew/science/vips
+```
+
+For GIF input and WebP output suppport use:
+
+```sh
+brew install homebrew/science/vips --with-imagemagick --with-webp
+```
+
+A missing or incorrectly configured _Xcode Command Line Tools_ installation
+[can lead](https://github.com/lovell/sharp/issues/80) to a
+`library not found for -ljpeg` error.
+If so, please try: `xcode-select --install`.
+
+The _gettext_ dependency of _libvips_
+[can lead](https://github.com/lovell/sharp/issues/9)
+to a `library not found for -lintl` error.
+If so, please try `brew link gettext --force`.
+
+### Windows
+
+[![Windows x64 Build Status](https://ci.appveyor.com/api/projects/status/pgtul704nkhhg6sg)](https://ci.appveyor.com/project/lovell/sharp)
+
+libvips and its dependencies are fetched and stored within `node_modules\sharp` during `npm install`.
+This involves an automated HTTPS download of approximately 9MB.
+
+Only 64-bit (x64) `node.exe` is supported.
+The WebP format is currently unavailable on Windows.
+
+### FreeBSD
+
+libvips must be installed before `npm install` is run.
+This can be achieved via [FreshPorts](https://www.freshports.org/graphics/vips/):
+
+```sh
+cd /usr/ports/graphics/vips/ && make install clean
+```
+
+### Heroku
+
+[Alessandro Tagliapietra](https://github.com/alex88) maintains an
+[Heroku buildpack for libvips](https://github.com/alex88/heroku-buildpack-vips)
+and its dependencies.
+
+### Docker
+
+[Marc Bachmann](https://github.com/marcbachmann) maintains an
+[Ubuntu-based Dockerfile for libvips](https://github.com/marcbachmann/dockerfile-libvips).
+
+```sh
+docker pull marcbachmann/libvips
+```
+
+[Will Jordan](https://github.com/wjordan) maintains an
+[Alpine-based Dockerfile for libvips](https://github.com/wjordan/dockerfile-libvips).
+
+```sh
+docker pull wjordan/libvips
+```
+
+### Build tools
+
+* [gulp-responsive](https://www.npmjs.com/package/gulp-responsive)
+* [grunt-sharp](https://www.npmjs.com/package/grunt-sharp)

docs/performance.md

@@ -0,0 +1,70 @@
+# Performance
+
+### Test environment
+
+* AWS EC2 [c4.xlarge](http://aws.amazon.com/ec2/instance-types/#c4) (4x E5-2666 v3 @2.90GHz)
+* Amazon Linux 2015.09.1
+* Node.js v5.5.0
+
+### The contenders
+
+* [jimp](https://www.npmjs.com/package/jimp) v0.2.20 - Image processing in pure JavaScript. Bilinear interpolation only.
+* [lwip](https://www.npmjs.com/package/lwip) v0.0.8 - Wrapper around CImg, compiles dependencies from source.
+* [imagemagick-native](https://www.npmjs.com/package/imagemagick-native) @47c7329 - Wrapper around libmagick++, supports Buffers only.
+* [imagemagick](https://www.npmjs.com/package/imagemagick) v0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
+* [gm](https://www.npmjs.com/package/gm) v1.21.0 - Fully featured wrapper around GraphicsMagick's `gm` command line utility.
+* sharp v0.13.0 / libvips v8.2.2 - Caching within libvips disabled to ensure a fair comparison.
+
+### The task
+
+Decompress a 2725x2225 JPEG image, resize to 720x480 using bicubic interpolation (where available), then compress to JPEG.
+
+### Results
+
+| Module             | Input  | Output | Ops/sec | Speed-up |
+| :----------------- | :----- | :----- | ------: | -------: |
+| jimp (bilinear)    | file   | file   |    1.04 |      1.0 |
+| jimp (bilinear)    | buffer | buffer |    1.07 |      1.0 |
+| lwip               | file   | file   |    1.13 |      1.1 |
+| lwip               | buffer | buffer |    1.13 |      1.1 |
+| imagemagick-native | buffer | buffer |    1.65 |      1.6 |
+| imagemagick        | file   | file   |    5.02 |      4.8 |
+| gm                 | buffer | buffer |    5.36 |      5.2 |
+| gm                 | file   | file   |    5.39 |      5.2 |
+| sharp              | stream | stream |   22.00 |     21.2 |
+| sharp              | file   | file   |   22.87 |     22.0 |
+| sharp              | file   | buffer |   23.03 |     22.1 |
+| sharp              | buffer | file   |   23.10 |     22.2 |
+| sharp              | buffer | buffer |   23.21 |     22.3 |
+
+Greater performance can be expected with caching enabled (default) and using 8+ core machines.
+
+The I/O limits of the relevant (de)compression library will generally determine maximum throughput.
+
+### Benchmark test prerequisites
+
+Requires both _ImageMagick_ and _GraphicsMagick_:
+
+```sh
+brew install imagemagick
+brew install graphicsmagick
+```
+
+```sh
+sudo apt-get install imagemagick libmagick++-dev graphicsmagick
+```
+
+```sh
+sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick
+```
+
+### Running the benchmark test
+
+```sh
+git clone https://github.com/lovell/sharp.git
+cd sharp
+npm install
+cd test/bench
+npm install
+npm test
+```

index.js

@@ -1,68 +1,211 @@
-/*jslint node: true */
 'use strict';
 
+var path = require('path');
 var util = require('util');
 var stream = require('stream');
-var Promise = require('bluebird');
+var events = require('events');
+
+var semver = require('semver');
+var color = require('color');
+var BluebirdPromise = require('bluebird');
+
 var sharp = require('./build/Release/sharp');
 
-var Sharp = function(input) {
+// Versioning
+var versions = {
+  vips: sharp.libvipsVersion()
+};
+(function() {
+  // Does libvips meet minimum requirement?
+  var libvipsVersionMin = require('./package.json').config.libvips;
+  if (semver.lt(versions.vips, libvipsVersionMin)) {
+    throw new Error('Found libvips ' + versions.vips + ' but require at least ' + libvipsVersionMin);
+  }
+  // Include versions of dependencies, if present
+  try {
+    versions = require('./lib/versions.json');
+  } catch (err) {}
+})();
+
+// Limits
+var maximum = {
+  width: 0x3FFF,
+  height: 0x3FFF,
+  pixels: Math.pow(0x3FFF, 2)
+};
+
+// Constructor-factory
+var Sharp = function(input, options) {
   if (!(this instanceof Sharp)) {
-    return new Sharp(input);
+    return new Sharp(input, options);
   }
   stream.Duplex.call(this);
   this.options = {
+    // input options
+    bufferIn: null,
+    streamIn: false,
+    sequentialRead: false,
+    limitInputPixels: maximum.pixels,
+    density: '72',
+    rawWidth: 0,
+    rawHeight: 0,
+    rawChannels: 0,
+    // ICC profiles
+    iccProfilePath: path.join(__dirname, 'icc') + path.sep,
+    // resize options
+    topOffsetPre: -1,
+    leftOffsetPre: -1,
+    widthPre: -1,
+    heightPre: -1,
+    topOffsetPost: -1,
+    leftOffsetPost: -1,
+    widthPost: -1,
+    heightPost: -1,
     width: -1,
     height: -1,
-    canvas: 'c',
+    canvas: 'crop',
     gravity: 0,
     angle: 0,
+    rotateBeforePreExtract: false,
+    flip: false,
+    flop: false,
     withoutEnlargement: false,
-    sharpen: false,
-    interpolator: 'bilinear',
+    interpolator: 'bicubic',
+    // operations
+    background: [0, 0, 0, 255],
+    flatten: false,
+    negate: false,
+    blurSigma: 0,
+    sharpenRadius: 0,
+    sharpenFlat: 1,
+    sharpenJagged: 2,
+    threshold: 0,
+    gamma: 0,
+    greyscale: false,
+    normalize: 0,
+    // overlay
+    overlayPath: '',
+    // output options
+    formatOut: 'input',
+    fileOut: '',
     progressive: false,
-    sequentialRead: false,
     quality: 80,
     compressionLevel: 6,
-    streamIn: false,
+    withoutAdaptiveFiltering: false,
+    withoutChromaSubsampling: false,
+    trellisQuantisation: false,
+    overshootDeringing: false,
+    optimiseScans: false,
     streamOut: false,
-    output: '__input'
+    withMetadata: false,
+    withMetadataOrientation: -1,
+    tileSize: 256,
+    tileOverlap: 0,
+    // Function to notify of queue length changes
+    queueListener: function(queueLength) {
+      module.exports.queue.emit('change', queueLength);
+    }
   };
   if (typeof input === 'string') {
     // input=file
     this.options.fileIn = input;
   } else if (typeof input === 'object' && input instanceof Buffer) {
     // input=buffer
-    if (input.length > 0) {
-      this.options.bufferIn = input;
-    } else {
-      throw new Error('Buffer is empty');
-    }
-  } else {
+    this.options.bufferIn = input;
+  } else if (typeof input === 'undefined' || input === null) {
     // input=stream
     this.options.streamIn = true;
+  } else {
+    throw new Error('Unsupported input ' + typeof input);
   }
+  this._inputOptions(options);
   return this;
 };
 module.exports = Sharp;
 util.inherits(Sharp, stream.Duplex);
 
+/*
+  EventEmitter singleton emits queue length 'change' events
+*/
+module.exports.queue = new events.EventEmitter();
+
+/*
+  Supported image formats
+*/
+module.exports.format = sharp.format();
+
+/*
+  Version numbers of libvips and its dependencies
+*/
+module.exports.versions = versions;
+
+/*
+  Validation helpers
+*/
+var isDefined = function(val) {
+  return typeof val !== 'undefined' && val !== null;
+};
+var isObject = function(val) {
+  return typeof val === 'object';
+};
+var isInteger = function(val) {
+  return typeof val === 'number' && !Number.isNaN(val) && val % 1 === 0;
+};
+var inRange = function(val, min, max) {
+  return val >= min && val <= max;
+};
+
+/*
+  Set input-related options
+    density: DPI at which to load vector images via libmagick
+*/
+Sharp.prototype._inputOptions = function(options) {
+  if (isObject(options)) {
+    // Density
+    if (isDefined(options.density)) {
+      if (isInteger(options.density) && inRange(options.density, 1, 2400)) {
+        this.options.density = options.density.toString();
+      } else {
+        throw new Error('Invalid density (1 to 2400) ' + options.density);
+      }
+    }
+    // Raw pixel input
+    if (isDefined(options.raw)) {
+      if (
+        isObject(options.raw) &&
+        isInteger(options.raw.width) && inRange(options.raw.width, 1, maximum.width) &&
+        isInteger(options.raw.height) && inRange(options.raw.height, 1, maximum.height) &&
+        isInteger(options.raw.channels) && inRange(options.raw.channels, 1, 4)
+      ) {
+        this.options.rawWidth = options.raw.width;
+        this.options.rawHeight = options.raw.height;
+        this.options.rawChannels = options.raw.channels;
+      } else {
+        throw new Error('Expected width, height and channels for raw pixel input');
+      }
+    }
+  } else if (isDefined(options)) {
+    throw new Error('Invalid input options ' + options);
+  }
+};
+
 /*
   Handle incoming chunk on Writable Stream
 */
 Sharp.prototype._write = function(chunk, encoding, callback) {
+  /*jslint unused: false */
   if (this.options.streamIn) {
-    if (typeof chunk === 'object' || chunk instanceof Buffer) {
-      if (typeof this.options.bufferIn === 'undefined') {
-        // Create new Buffer
-        this.options.bufferIn = new Buffer(chunk.length);
-        chunk.copy(this.options.bufferIn);
-      } else {
+    if (typeof chunk === 'object' && chunk instanceof Buffer) {
+      if (this.options.bufferIn instanceof Buffer) {
         // Append to existing Buffer
         this.options.bufferIn = Buffer.concat(
           [this.options.bufferIn, chunk],
           this.options.bufferIn.length + chunk.length
         );
+      } else {
+        // Create new Buffer
+        this.options.bufferIn = new Buffer(chunk.length);
+        chunk.copy(this.options.bufferIn);
       }
       callback();
     } else {
@@ -74,33 +217,113 @@ Sharp.prototype._write = function(chunk, encoding, callback) {
 };
 
 // Crop this part of the resized image (Center/Centre, North, East, South, West)
-module.exports.gravity = {'center': 0, 'centre': 0, 'north': 1, 'east': 2, 'south': 3, 'west': 4};
+module.exports.gravity = {
+  'center': 0,
+  'centre': 0,
+  'north': 1,
+  'east': 2,
+  'south': 3,
+  'west': 4,
+  'northeast': 5,
+  'southeast': 6,
+  'southwest': 7,
+  'northwest': 8
+};
 
 Sharp.prototype.crop = function(gravity) {
-  this.options.canvas = 'c';
-  if (typeof gravity !== 'undefined') {
-    // Is this a supported gravity?
-    if (!Number.isNaN(gravity) && gravity >= 0 && gravity <= 4) {
-      this.options.gravity = gravity;
-    } else {
-      throw new Error('Unsupported crop gravity ' + gravity);
-    }
+  this.options.canvas = 'crop';
+  if (typeof gravity === 'undefined') {
+    this.options.gravity = module.exports.gravity.center;
+  } else if (typeof gravity === 'number' && !Number.isNaN(gravity) && gravity >= 0 && gravity <= 8) {
+    this.options.gravity = gravity;
+  } else if (typeof gravity === 'string' && typeof module.exports.gravity[gravity] === 'number') {
+    this.options.gravity = module.exports.gravity[gravity];
+  } else {
+    throw new Error('Unsupported crop gravity ' + gravity);
   }
   return this;
 };
 
-Sharp.prototype.embedWhite = function() {
-  this.options.canvas = 'w';
+Sharp.prototype.extract = function(options) {
+  if (!options || typeof options !== 'object') {
+    // Legacy extract(top,left,width,height) syntax
+    options = {
+      left: arguments[1],
+      top: arguments[0],
+      width: arguments[2],
+      height: arguments[3]
+    };
+  }
+  var suffix = this.options.width === -1 && this.options.height === -1 ? 'Pre' : 'Post';
+  ['left', 'top', 'width', 'height'].forEach(function (name) {
+    var value = options[name];
+    if (typeof value === 'number' && !Number.isNaN(value) && value % 1 === 0 && value >= 0) {
+      this.options[name + (name === 'left' || name === 'top' ? 'Offset' : '') + suffix] = value;
+    } else {
+      throw new Error('Non-integer value for ' + name + ' of ' + value);
+    }
+  }, this);
+  // Ensure existing rotation occurs before pre-resize extraction
+  if (suffix === 'Pre' && this.options.angle !== 0) {
+    this.options.rotateBeforePreExtract = true;
+  }
   return this;
 };
 
-Sharp.prototype.embedBlack = function() {
-  this.options.canvas = 'b';
+/*
+  Set the background colour for embed and flatten operations.
+  Delegates to the 'Color' module, which can throw an Error
+  but is liberal in what it accepts, clamping values to sensible min/max.
+*/
+Sharp.prototype.background = function(rgba) {
+  var colour = color(rgba);
+  this.options.background = colour.rgbArray();
+  this.options.background.push(colour.alpha() * 255);
+  return this;
+};
+
+Sharp.prototype.embed = function() {
+  this.options.canvas = 'embed';
   return this;
 };
 
 Sharp.prototype.max = function() {
-  this.options.canvas = 'm';
+  this.options.canvas = 'max';
+  return this;
+};
+
+Sharp.prototype.min = function() {
+  this.options.canvas = 'min';
+  return this;
+};
+
+/*
+  Ignoring the aspect ratio of the input, stretch the image to
+  the exact width and/or height provided via the resize method.
+*/
+Sharp.prototype.ignoreAspectRatio = function() {
+  this.options.canvas = 'ignore_aspect';
+  return this;
+};
+
+Sharp.prototype.flatten = function(flatten) {
+  this.options.flatten = (typeof flatten === 'boolean') ? flatten : true;
+  return this;
+};
+
+Sharp.prototype.negate = function(negate) {
+  this.options.negate = (typeof negate === 'boolean') ? negate : true;
+  return this;
+};
+
+Sharp.prototype.overlayWith = function(overlayPath) {
+  if (typeof overlayPath !== 'string') {
+    throw new Error('The overlay path must be a string');
+  }
+  if (overlayPath === '') {
+    throw new Error('The overlay path cannot be empty');
+  }
+  this.options.overlayPath = overlayPath;
   return this;
 };
 
@@ -119,6 +342,22 @@ Sharp.prototype.rotate = function(angle) {
   return this;
 };
 
+/*
+  Flip the image vertically, about the Y axis
+*/
+Sharp.prototype.flip = function(flip) {
+  this.options.flip = (typeof flip === 'boolean') ? flip : true;
+  return this;
+};
+
+/*
+  Flop the image horizontally, about the X axis
+*/
+Sharp.prototype.flop = function(flop) {
+  this.options.flop = (typeof flop === 'boolean') ? flop : true;
+  return this;
+};
+
 /*
   Do not enlarge the output if the input width *or* height are already less than the required dimensions
   This is equivalent to GraphicsMagick's ">" geometry option:
@@ -129,8 +368,77 @@ Sharp.prototype.withoutEnlargement = function(withoutEnlargement) {
   return this;
 };
 
-Sharp.prototype.sharpen = function(sharpen) {
-  this.options.sharpen = (typeof sharpen === 'boolean') ? sharpen : true;
+/*
+  Blur the output image.
+  Call without a sigma to use a fast, mild blur.
+  Call with a sigma to use a slower, more accurate Gaussian blur.
+*/
+Sharp.prototype.blur = function(sigma) {
+  if (typeof sigma === 'undefined') {
+    // No arguments: default to mild blur
+    this.options.blurSigma = -1;
+  } else if (typeof sigma === 'boolean') {
+    // Boolean argument: apply mild blur?
+    this.options.blurSigma = sigma ? -1 : 0;
+  } else if (typeof sigma === 'number' && !Number.isNaN(sigma) && sigma >= 0.3 && sigma <= 1000) {
+    // Numeric argument: specific sigma
+    this.options.blurSigma = sigma;
+  } else {
+    throw new Error('Invalid blur sigma (0.3 to 1000.0) ' + sigma);
+  }
+  return this;
+};
+
+/*
+  Sharpen the output image.
+  Call without a radius to use a fast, mild sharpen.
+  Call with a radius to use a slow, accurate sharpen using the L of LAB colour space.
+    radius - size of mask in pixels, must be integer
+    flat - level of "flat" area sharpen, default 1
+    jagged - level of "jagged" area sharpen, default 2
+*/
+Sharp.prototype.sharpen = function(radius, flat, jagged) {
+  if (typeof radius === 'undefined') {
+    // No arguments: default to mild sharpen
+    this.options.sharpenRadius = -1;
+  } else if (typeof radius === 'boolean') {
+    // Boolean argument: apply mild sharpen?
+    this.options.sharpenRadius = radius ? -1 : 0;
+  } else if (typeof radius === 'number' && !Number.isNaN(radius) && (radius % 1 === 0) && radius >= 1) {
+    // Numeric argument: specific radius
+    this.options.sharpenRadius = radius;
+    // Control over flat areas
+    if (typeof flat !== 'undefined' && flat !== null) {
+      if (typeof flat === 'number' && !Number.isNaN(flat) && flat >= 0) {
+        this.options.sharpenFlat = flat;
+      } else {
+        throw new Error('Invalid sharpen level for flat areas ' + flat + ' (expected >= 0)');
+      }
+    }
+    // Control over jagged areas
+    if (typeof jagged !== 'undefined' && jagged !== null) {
+      if (typeof jagged === 'number' && !Number.isNaN(jagged) && jagged >= 0) {
+        this.options.sharpenJagged = jagged;
+      } else {
+        throw new Error('Invalid sharpen level for jagged areas ' + jagged + ' (expected >= 0)');
+      }
+    }
+  } else {
+    throw new Error('Invalid sharpen radius ' + radius + ' (expected integer >= 1)');
+  }
+  return this;
+};
+
+Sharp.prototype.threshold = function(threshold) {
+  if (typeof threshold === 'undefined') {
+    this.options.threshold = 128;
+  } else if (typeof threshold === 'boolean') {
+    this.options.threshold = threshold ? 128 : 0;
+  } else if (typeof threshold === 'number' && !Number.isNaN(threshold) && (threshold % 1 === 0) && threshold >= 0 && threshold <= 255) {
+    this.options.threshold = threshold;
+  } else {
+    throw new Error('Invalid threshold (0 to 255) ' + threshold);
+  }
   return this;
 };
 
@@ -138,6 +446,7 @@ Sharp.prototype.sharpen = function(sharpen) {
   Set the interpolator to use for the affine transformation
 */
 module.exports.interpolator = {
+  nearest: 'nearest',
   bilinear: 'bilinear',
   bicubic: 'bicubic',
   nohalo: 'nohalo',
@@ -145,22 +454,54 @@ module.exports.interpolator = {
   vertexSplitQuadraticBasisSpline: 'vsqbs'
 };
 Sharp.prototype.interpolateWith = function(interpolator) {
-  this.options.interpolator = interpolator;
+  var isValid = false;
+  for (var key in module.exports.interpolator) {
+    if (module.exports.interpolator[key] === interpolator) {
+      isValid = true;
+      break;
+    }
+  }
+  if (isValid) {
+    this.options.interpolator = interpolator;
+  } else {
+    throw new Error('Invalid interpolator ' + interpolator);
+  }
   return this;
 };
 
 /*
-  Deprecated interpolation methods, to be removed in v0.7.0
+  Darken image pre-resize (1/gamma) and brighten post-resize (gamma).
+  Improves brightness of resized image in non-linear colour spaces.
 */
-Sharp.prototype.bilinearInterpolation = util.deprecate(function() {
-  return this.interpolateWith(module.exports.interpolator.bilinear);
-}, 'bilinearInterpolation() is deprecated, use interpolateWith(sharp.interpolator.bilinear) instead');
-Sharp.prototype.bicubicInterpolation = util.deprecate(function() {
-  return this.interpolateWith(module.exports.interpolator.bicubic);
-}, 'bicubicInterpolation() is deprecated, use interpolateWith(sharp.interpolator.bicubic) instead');
-Sharp.prototype.nohaloInterpolation = util.deprecate(function() {
-  return this.interpolateWith(module.exports.interpolator.nohalo);
-}, 'nohaloInterpolation() is deprecated, use interpolateWith(sharp.interpolator.nohalo) instead');
+Sharp.prototype.gamma = function(gamma) {
+  if (typeof gamma === 'undefined') {
+    // Default gamma correction of 2.2 (sRGB)
+    this.options.gamma = 2.2;
+  } else if (!Number.isNaN(gamma) && gamma >= 1 && gamma <= 3) {
+    this.options.gamma = gamma;
+  } else {
+    throw new Error('Invalid gamma correction (1.0 to 3.0) ' + gamma);
+  }
+  return this;
+};
+
+/*
+  Enhance output image contrast by stretching its luminance to cover the full dynamic range
+*/
+Sharp.prototype.normalize = function(normalize) {
+  this.options.normalize = (typeof normalize === 'boolean') ? normalize : true;
+  return this;
+};
+Sharp.prototype.normalise = Sharp.prototype.normalize;
+
+/*
+  Convert to greyscale
+*/
+Sharp.prototype.greyscale = function(greyscale) {
+  this.options.greyscale = (typeof greyscale === 'boolean') ? greyscale : true;
+  return this;
+};
+Sharp.prototype.grayscale = Sharp.prototype.greyscale;
 
 Sharp.prototype.progressive = function(progressive) {
   this.options.progressive = (typeof progressive === 'boolean') ? progressive : true;
@@ -173,7 +514,7 @@ Sharp.prototype.sequentialRead = function(sequentialRead) {
 };
 
 Sharp.prototype.quality = function(quality) {
-  if (!Number.isNaN(quality) && quality >= 1 && quality <= 100) {
+  if (!Number.isNaN(quality) && quality >= 1 && quality <= 100 && quality % 1 === 0) {
     this.options.quality = quality;
   } else {
     throw new Error('Invalid quality (1 to 100) ' + quality);
@@ -181,11 +522,110 @@ Sharp.prototype.quality = function(quality) {
   return this;
 };
 
+/*
+  zlib compression level for PNG output
+*/
 Sharp.prototype.compressionLevel = function(compressionLevel) {
-  if (!Number.isNaN(compressionLevel) && compressionLevel >= -1 && compressionLevel <= 9) {
+  if (!Number.isNaN(compressionLevel) && compressionLevel >= 0 && compressionLevel <= 9) {
     this.options.compressionLevel = compressionLevel;
   } else {
-    throw new Error('Invalid compressionLevel (-1 to 9) ' + compressionLevel);
+    throw new Error('Invalid compressionLevel (0 to 9) ' + compressionLevel);
+  }
+  return this;
+};
+
+/*
+  Disable the use of adaptive row filtering for PNG output
+*/
+Sharp.prototype.withoutAdaptiveFiltering = function(withoutAdaptiveFiltering) {
+  this.options.withoutAdaptiveFiltering = (typeof withoutAdaptiveFiltering === 'boolean') ? withoutAdaptiveFiltering : true;
+  return this;
+};
+
+/*
+  Disable the use of chroma subsampling for JPEG output
+*/
+Sharp.prototype.withoutChromaSubsampling = function(withoutChromaSubsampling) {
+  this.options.withoutChromaSubsampling = (typeof withoutChromaSubsampling === 'boolean') ? withoutChromaSubsampling : true;
+  return this;
+};
+
+/*
+  Apply trellis quantisation to JPEG output - requires mozjpeg 3.0+
+*/
+Sharp.prototype.trellisQuantisation = function(trellisQuantisation) {
+  this.options.trellisQuantisation = (typeof trellisQuantisation === 'boolean') ? trellisQuantisation : true;
+  return this;
+};
+Sharp.prototype.trellisQuantization = Sharp.prototype.trellisQuantisation;
+
+/*
+  Apply overshoot deringing to JPEG output - requires mozjpeg 3.0+
+*/
+Sharp.prototype.overshootDeringing = function(overshootDeringing) {
+  this.options.overshootDeringing = (typeof overshootDeringing === 'boolean') ? overshootDeringing : true;
+  return this;
+};
+
+/*
+  Optimise scans in progressive JPEG output - requires mozjpeg 3.0+
+*/
+Sharp.prototype.optimiseScans = function(optimiseScans) {
+  this.options.optimiseScans = (typeof optimiseScans === 'boolean') ? optimiseScans : true;
+  if (this.options.optimiseScans) {
+    this.progressive();
+  }
+  return this;
+};
+Sharp.prototype.optimizeScans = Sharp.prototype.optimiseScans;
+
+/*
+  Include all metadata (EXIF, XMP, IPTC) from the input image in the output image
+  Optionally provide an Object with attributes to update:
+    orientation: numeric value for EXIF Orientation tag
+*/
+Sharp.prototype.withMetadata = function(withMetadata) {
+  this.options.withMetadata = (typeof withMetadata === 'boolean') ? withMetadata : true;
+  if (typeof withMetadata === 'object') {
+    if ('orientation' in withMetadata) {
+      if (
+        typeof withMetadata.orientation === 'number' &&
+        !Number.isNaN(withMetadata.orientation) &&
+        withMetadata.orientation % 1 === 0 &&
+        withMetadata.orientation >= 0 &&
+        withMetadata.orientation <= 7
+      ) {
+        this.options.withMetadataOrientation = withMetadata.orientation;
+      } else {
+        throw new Error('Invalid orientation (0 to 7) ' + withMetadata.orientation);
+      }
+    }
+  }
+  return this;
+};
+
+/*
+  Tile size and overlap for Deep Zoom output
+*/
+Sharp.prototype.tile = function(size, overlap) {
+  // Size of square tiles, in pixels
+  if (typeof size !== 'undefined' && size !== null) {
+    if (!Number.isNaN(size) && size % 1 === 0 && size >= 1 && size <= 8192) {
+      this.options.tileSize = size;
+    } else {
+      throw new Error('Invalid tile size (1 to 8192) ' + size);
+    }
+  }
+  // Overlap of tiles, in pixels
+  if (typeof overlap !== 'undefined' && overlap !== null) {
+    if (!Number.isNaN(overlap) && overlap % 1 === 0 && overlap >= 0 && overlap <= 8192) {
+      if (overlap > this.options.tileSize) {
+        throw new Error('Tile overlap ' + overlap + ' cannot be larger than tile size ' + this.options.tileSize);
+      }
+      this.options.tileOverlap = overlap;
+    } else {
+      throw new Error('Invalid tile overlap (0 to 8192) ' + overlap);
+    }
   }
   return this;
 };
@@ -194,81 +634,118 @@ Sharp.prototype.resize = function(width, height) {
   if (!width) {
     this.options.width = -1;
   } else {
-    if (!Number.isNaN(width)) {
+    if (typeof width === 'number' && !Number.isNaN(width) && width % 1 === 0 && width > 0 && width <= maximum.width) {
       this.options.width = width;
     } else {
-      throw new Error('Invalid width ' + width);
+      throw new Error('Invalid width (1 to ' + maximum.width + ') ' + width);
     }
   }
   if (!height) {
     this.options.height = -1;
   } else {
-    if (!Number.isNaN(height)) {
+    if (typeof height === 'number' && !Number.isNaN(height) && height % 1 === 0 && height > 0 && height <= maximum.height) {
       this.options.height = height;
     } else {
-      throw new Error('Invalid height ' + height);
+      throw new Error('Invalid height (1 to ' + maximum.height + ') ' + height);
     }
   }
   return this;
 };
 
+/*
+  Limit the total number of pixels for input images
+  Assumes the image dimensions contained in the file header can be trusted
+*/
+Sharp.prototype.limitInputPixels = function(limit) {
+  if (typeof limit === 'number' && !Number.isNaN(limit) && limit % 1 === 0 && limit > 0) {
+    this.options.limitInputPixels = limit;
+  } else {
+    throw new Error('Invalid pixel limit (1 to ' + maximum.pixels + ') ' + limit);
+  }
+  return this;
+};
+
 /*
   Write output image data to a file
 */
-Sharp.prototype.toFile = function(output, callback) {
-  if (!output || output.length === 0) {
+Sharp.prototype.toFile = function(fileOut, callback) {
+  if (!fileOut || fileOut.length === 0) {
     var errOutputInvalid = new Error('Invalid output');
     if (typeof callback === 'function') {
       callback(errOutputInvalid);
     } else {
-      return Promise.reject(errOutputInvalid);
+      return BluebirdPromise.reject(errOutputInvalid);
     }
   } else {
-    if (this.options.fileIn === output) {
+    if (this.options.fileIn === fileOut) {
       var errOutputIsInput = new Error('Cannot use same file for input and output');
       if (typeof callback === 'function') {
         callback(errOutputIsInput);
       } else {
-        return Promise.reject(errOutputIsInput);
+        return BluebirdPromise.reject(errOutputIsInput);
       }
     } else {
-      this.options.output = output;
-      return this._sharp(callback);
+      this.options.fileOut = fileOut;
+      return this._pipeline(callback);
     }
   }
   return this;
 };
 
+/*
+  Write output to a Buffer
+*/
 Sharp.prototype.toBuffer = function(callback) {
-  return this._sharp(callback);
+  return this._pipeline(callback);
 };
 
+/*
+  Force JPEG output
+*/
 Sharp.prototype.jpeg = function() {
-  this.options.output = '__jpeg';
-  if (arguments.length > 0) {
-    console.error('Use of the jpeg() method with a callback is deprecated in 0.6.x and will be removed in 0.7.x');
-    console.error('Please add toFile(), toBuffer() or Stream methods e.g. pipe() for JPEG output');
-    this._sharp(arguments);
-  }
+  this.options.formatOut = 'jpeg';
   return this;
 };
 
+/*
+  Force PNG output
+*/
 Sharp.prototype.png = function() {
-  this.options.output = '__png';
-  if (arguments.length > 0) {
-    console.error('Use of the png() method with a callback is deprecated in 0.6.x and will be removed in 0.7.x');
-    console.error('Please add toFile(), toBuffer() or Stream methods e.g. pipe() for PNG output');
-    this._sharp(arguments);
-  }
+  this.options.formatOut = 'png';
   return this;
 };
 
+/*
+  Force WebP output
+*/
 Sharp.prototype.webp = function() {
-  this.options.output = '__webp';
-  if (arguments.length > 0) {
-    console.error('Use of the webp() method with a callback is deprecated in 0.6.x and will be removed in 0.7.x');
-    console.error('Please add toFile(), toBuffer() or Stream methods e.g. pipe() for WebP output');
-    this._sharp(arguments);
+  this.options.formatOut = 'webp';
+  return this;
+};
+
+/*
+  Force raw, uint8 output
+*/
+Sharp.prototype.raw = function() {
+  this.options.formatOut = 'raw';
+  return this;
+};
+
+/*
+  Force output to a given format
+  @param format is either the id as a String or an Object with an 'id' attribute
+*/
+Sharp.prototype.toFormat = function(formatOut) {
+  if (isObject(formatOut) && isDefined(formatOut.id)) {
+    formatOut = formatOut.id;
+  }
+  if (
+    isDefined(formatOut) &&
+    ['jpeg', 'png', 'webp', 'raw', 'tiff', 'dz', 'input'].indexOf(formatOut) !== -1
+  ) {
+    this.options.formatOut = formatOut;
+  } else {
+    throw new Error('Unsupported output format ' + formatOut);
   }
   return this;
 };
@@ -279,7 +756,7 @@ Sharp.prototype.webp = function() {
 Sharp.prototype._read = function() {
   if (!this.options.streamOut) {
     this.options.streamOut = true;
-    this._sharp();
+    this._pipeline();
   }
 };
 
@@ -287,18 +764,18 @@ Sharp.prototype._read = function() {
   Invoke the C++ image processing pipeline
   Supports callback, stream and promise variants
 */
-Sharp.prototype._sharp = function(callback) {
+Sharp.prototype._pipeline = function(callback) {
   var that = this;
   if (typeof callback === 'function') {
     // output=file/buffer
     if (this.options.streamIn) {
       // output=file/buffer, input=stream
       this.on('finish', function() {
-        sharp.resize(that.options, callback);
+        sharp.pipeline(that.options, callback);
       });
     } else {
       // output=file/buffer, input=file/buffer
-      sharp.resize(this.options, callback);
+      sharp.pipeline(this.options, callback);
     }
     return this;
   } else if (this.options.streamOut) {
@@ -306,17 +783,23 @@ Sharp.prototype._sharp = function(callback) {
     if (this.options.streamIn) {
       // output=stream, input=stream
       this.on('finish', function() {
-        sharp.resize(that.options, function(err, data) {
-          if (err) throw err;
-          that.push(data);
+        sharp.pipeline(that.options, function(err, data) {
+          if (err) {
+            that.emit('error', err);
+          } else {
+            that.push(data);
+          }
           that.push(null);
         });
       });
     } else {
       // output=stream, input=file/buffer
-      sharp.resize(this.options, function(err, data) {
-        if (err) throw err;
-        that.push(data);
+      sharp.pipeline(this.options, function(err, data) {
+        if (err) {
+          that.emit('error', err);
+        } else {
+          that.push(data);
+        }
         that.push(null);
       });
     }
@@ -325,9 +808,9 @@ Sharp.prototype._sharp = function(callback) {
     // output=promise
     if (this.options.streamIn) {
       // output=promise, input=stream
-      return new Promise(function(resolve, reject) {
+      return new BluebirdPromise(function(resolve, reject) {
         that.on('finish', function() {
-          sharp.resize(that.options, function(err, data) {
+          sharp.pipeline(that.options, function(err, data) {
             if (err) {
               reject(err);
             } else {
@@ -338,8 +821,8 @@ Sharp.prototype._sharp = function(callback) {
       });
     } else {
       // output=promise, input=file/buffer
-      return new Promise(function(resolve, reject) {
-        sharp.resize(that.options, function(err, data) {
+      return new BluebirdPromise(function(resolve, reject) {
+        sharp.pipeline(that.options, function(err, data) {
           if (err) {
             reject(err);
           } else {
@@ -368,24 +851,24 @@ Sharp.prototype.metadata = function(callback) {
     return this;
   } else {
     if (this.options.streamIn) {
-      return new Promise(function(resolve, reject) {
+      return new BluebirdPromise(function(resolve, reject) {
         that.on('finish', function() {
-          sharp.metadata(that.options, function(err, data) {
+          sharp.metadata(that.options, function(err, metadata) {
             if (err) {
               reject(err);
             } else {
-              resolve(data);
+              resolve(metadata);
             }
           });
         });
       });
     } else {
-      return new Promise(function(resolve, reject) {
-        sharp.metadata(that.options, function(err, data) {
+      return new BluebirdPromise(function(resolve, reject) {
+        sharp.metadata(that.options, function(err, metadata) {
           if (err) {
             reject(err);
           } else {
-            resolve(data);
+            resolve(metadata);
           }
         });
       });
@@ -394,16 +877,51 @@ Sharp.prototype.metadata = function(callback) {
 };
 
 /*
-  Get and set cache memory and item limits
+  Clone new instance using existing options.
+  Cloned instances share the same input.
 */
-module.exports.cache = function(memory, items) {
-  if (Number.isNaN(memory)) {
-    memory = null;
+Sharp.prototype.clone = function() {
+  // Clone existing options
+  var clone = new Sharp();
+  util._extend(clone.options, this.options);
+  clone.streamIn = false;
+  // Pass 'finish' event to clone for Stream-based input
+  this.on('finish', function() {
+    // Clone inherits input data
+    clone.options.bufferIn = this.options.bufferIn;
+    clone.emit('finish');
+  });
+  return clone;
+};
+
+/**
+  Get and set cache memory, file and item limits
+*/
+module.exports.cache = function(options) {
+  if (typeof options === 'boolean') {
+    if (options) {
+      // Default cache settings of 50MB, 20 files, 100 items
+      return sharp.cache(50, 20, 100);
+    } else {
+      return sharp.cache(0, 0, 0);
+    }
+  } else if (typeof options === 'object') {
+    return sharp.cache(options.memory, options.files, options.items);
+  } else {
+    return sharp.cache();
   }
-  if (Number.isNaN(items)) {
-    items = null;
+};
+// Ensure default cache settings are set
+module.exports.cache(true);
+
+/*
+  Get and set size of thread pool
+*/
+module.exports.concurrency = function(concurrency) {
+  if (typeof concurrency !== 'number' || Number.isNaN(concurrency)) {
+    concurrency = null;
   }
-  return sharp.cache(memory, items);
+  return sharp.concurrency(concurrency);
 };
 
 /*
@@ -412,3 +930,15 @@ module.exports.cache = function(memory, items) {
 module.exports.counters = function() {
   return sharp.counters();
 };
+
+/*
+  Get and set use of SIMD vector unit instructions
+*/
+module.exports.simd = function(simd) {
+  if (typeof simd !== 'boolean') {
+    simd = null;
+  }
+  return sharp.simd(simd);
+};
+// Switch off default
+module.exports.simd(false);

mkdocs.yml

@@ -0,0 +1,17 @@
+site_name: sharp
+site_url: http://sharp.dimens.io/
+repo_url: https://github.com/lovell/sharp
+site_description: The fastest Node.js module for resizing JPEG, PNG, WebP and TIFF images. Uses the libvips library.
+copyright: <a href="https://dimens.io/">dimens.io</a>
+google_analytics: ['UA-13034748-12', 'sharp.dimens.io']
+theme: readthedocs
+markdown_extensions:
+  - toc:
+      permalink: True
+dev_addr: 0.0.0.0:10101
+pages:
+  - Home: index.md
+  - Installation: install.md
+  - API: api.md
+  - Performance: performance.md
+  - Changelog: changelog.md

package.json

@@ -1,15 +1,33 @@
 {
   "name": "sharp",
-  "version": "0.6.0",
+  "version": "0.13.0",
   "author": "Lovell Fuller <npm@lovell.info>",
   "contributors": [
     "Pierre Inglebert <pierre.inglebert@gmail.com>",
     "Jonathan Ong <jonathanrichardong@gmail.com>",
-    "Chanon Sajjamanochai <chanon.s@gmail.com>"
+    "Chanon Sajjamanochai <chanon.s@gmail.com>",
+    "Juliano Julio <julianojulio@gmail.com>",
+    "Daniel Gasienica <daniel@gasienica.ch>",
+    "Julian Walker <julian@fiftythree.com>",
+    "Amit Pitaru <pitaru.amit@gmail.com>",
+    "Brandon Aaron <hello.brandon@aaron.sh>",
+    "Andreas Lind <andreas@one.com>",
+    "Maurus Cuelenaere <mcuelenaere@gmail.com>",
+    "Linus Unnebäck <linus@folkdatorn.se>",
+    "Victor Mateevitsi <mvictoras@gmail.com>",
+    "Alaric Holloway <alaric.holloway@gmail.com>",
+    "Bernhard K. Weisshuhn <bkw@codingforce.com>",
+    "Chris Riley <criley@primedia.com>",
+    "David Carley <dacarley@gmail.com>"
   ],
-  "description": "High performance Node.js module to resize JPEG, PNG and WebP images using the libvips library",
+  "description": "High performance Node.js module to resize JPEG, PNG, WebP and TIFF images using the libvips library",
   "scripts": {
-    "test": "node tests/unit && node tests/perf"
+    "clean": "rm -rf node_modules/ build/ include/ lib/ coverage/ test/fixtures/output.*",
+    "test": "VIPS_WARNING=0 node ./node_modules/istanbul/lib/cli.js cover ./node_modules/mocha/bin/_mocha -- --slow=5000 --timeout=30000 ./test/unit/*.js",
+    "test-win": "node ./node_modules/mocha/bin/mocha --slow=5000 --timeout=30000 ./test/unit/*.js",
+    "test-leak": "./test/leak/leak.sh",
+    "test-packaging": "./packaging/test.sh",
+    "test-clean": "rm -rf coverage/ test/fixtures/output.* && npm install && npm test"
   },
   "main": "index.js",
   "repository": {
@@ -21,30 +39,37 @@
     "png",
     "webp",
     "tiff",
-    "gif",
+    "dzi",
     "resize",
     "thumbnail",
-    "sharpen",
     "crop",
-    "embed",
     "libvips",
-    "vips",
-    "fast",
-    "buffer",
-    "stream"
+    "vips"
   ],
   "dependencies": {
-    "nan": "^1.3.0",
-    "bluebird": "^2.3.0"
+    "bluebird": "^3.2.2",
+    "color": "^0.11.1",
+    "nan": "^2.2.0",
+    "semver": "^5.1.0",
+    "request": "^2.69.0",
+    "tar": "^2.2.1"
   },
   "devDependencies": {
-    "imagemagick": "^0.1.3",
-    "imagemagick-native": "^1.2.2",
-    "gm": "^1.16.0",
-    "async": "^0.9.0",
-    "benchmark": "^1.0.0"
+    "async": "^1.5.2",
+    "coveralls": "^2.11.6",
+    "exif-reader": "^1.0.0",
+    "icc": "^0.0.2",
+    "istanbul": "^0.4.2",
+    "mocha": "^2.4.5",
+    "mocha-jshint": "^2.3.1",
+    "node-cpplint": "^0.4.0",
+    "rimraf": "^2.5.1",
+    "bufferutil": "^1.2.1"
+  },
+  "license": "Apache-2.0",
+  "config": {
+    "libvips": "8.2.2"
   },
-  "license": "Apache 2.0",
   "engines": {
     "node": ">=0.10"
   }

packaging/arm-build.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+if [ $# -lt 1 ]; then
+  echo "Usage: $0 IP"
+  echo "Build libvips for ARM using Docker, where IP is"
+  echo "the address of a Raspberry Pi running HypriotOS"
+  exit 1
+fi
+IP="$1"
+
+echo "Verifying connectivity to $IP"
+if ! ping -c 1 $IP; then
+  echo "Could not connect to $IP"
+  exit 1
+fi
+
+if ! type sshpass >/dev/null; then
+  echo "Please install sshpass"
+  exit 1
+fi
+
+export SSHPASS=hypriot
+
+echo "Copying arm/Dockerfile and arm/build.sh to device"
+sshpass -e scp -o PreferredAuthentications=password -r arm root@${IP}:/root
+
+echo "Building Raspbian-based container"
+sshpass -e ssh -o PreferredAuthentications=password -t root@${IP} "docker build -t vips-dev-arm arm"
+
+echo "Running arm/build.sh within container"
+sshpass -e ssh -o PreferredAuthentications=password -t root@${IP} "docker run -i -t --rm -v \${PWD}/arm:/arm vips-dev-arm sh -c 'cd /arm && ./build.sh' | tee arm/build.log"
+
+echo "Copying resultant tar.gz file from device"
+sshpass -e scp -o PreferredAuthentications=password root@${IP}:/root/arm/*.tar.gz .

packaging/arm-test.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+if [ $# -lt 1 ]; then
+  echo "Usage: $0 IP"
+  echo "Test sharp on ARM using Docker, where IP is"
+  echo "the address of a Raspberry Pi running HypriotOS"
+  exit 1
+fi
+IP="$1"
+
+echo "Verifying connectivity to $IP"
+if ! ping -c 1 $IP; then
+  echo "Could not connect to $IP"
+  exit 1
+fi
+
+if ! type sshpass >/dev/null; then
+  echo "Please install sshpass"
+  exit 1
+fi
+
+export SSHPASS=hypriot
+
+echo "Copying sharp source to device"
+sshpass -e scp -o PreferredAuthentications=password -r ../../sharp root@${IP}:/root/sharp
+
+echo "Compile and test within container"
+sshpass -e ssh -o PreferredAuthentications=password -t root@${IP} "docker run -i -t --rm -v \${PWD}/sharp:/s hypriot/rpi-node:5 sh -c 'cd /s && npm install --unsafe-perm && npm test'"

packaging/arm/Dockerfile

@@ -0,0 +1,5 @@
+FROM resin/rpi-raspbian:jessie
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+# Build dependencies
+RUN apt-get update && apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo curl

packaging/arm/build.sh

@@ -0,0 +1,137 @@
+#!/bin/sh
+
+# To be run inside a Raspbian container
+
+# Working directories
+DEPS=/deps
+TARGET=/target
+mkdir ${DEPS}
+mkdir ${TARGET}
+
+# Common build paths and flags
+export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:${TARGET}/lib/pkgconfig"
+export PATH="${PATH}:${TARGET}/bin"
+export CPPFLAGS="-I${TARGET}/include"
+export LDFLAGS="-L${TARGET}/lib"
+export CFLAGS="-O3"
+export CXXFLAGS="-O3"
+
+# Dependency version numbers
+VERSION_ZLIB=1.2.8
+VERSION_FFI=3.2.1
+VERSION_GLIB=2.47.5
+VERSION_XML2=2.9.3
+VERSION_GSF=1.14.34
+VERSION_EXIF=0.6.21
+VERSION_LCMS2=2.7
+VERSION_GM=1.3.23
+VERSION_JPEG=1.4.2
+VERSION_PNG16=1.6.21
+VERSION_WEBP=0.5.0
+VERSION_TIFF=4.0.6
+VERSION_ORC=0.4.24
+VERSION_VIPS=8.2.2
+
+mkdir ${DEPS}/zlib
+curl -Ls http://zlib.net/zlib-${VERSION_ZLIB}.tar.xz | tar xJC ${DEPS}/zlib --strip-components=1
+cd ${DEPS}/zlib
+./configure --prefix=${TARGET} && make install
+rm ${TARGET}/lib/libz.a
+
+mkdir ${DEPS}/ffi
+curl -Ls ftp://sourceware.org/pub/libffi/libffi-${VERSION_FFI}.tar.gz | tar xzC ${DEPS}/ffi --strip-components=1
+cd ${DEPS}/ffi
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-builddir && make install-strip
+
+mkdir ${DEPS}/glib
+curl -Ls https://download.gnome.org/sources/glib/2.47/glib-${VERSION_GLIB}.tar.xz | tar xJC ${DEPS}/glib --strip-components=1
+cd ${DEPS}/glib
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-pcre=internal && make install-strip
+
+mkdir ${DEPS}/xml2
+curl -Ls http://xmlsoft.org/sources/libxml2-${VERSION_XML2}.tar.gz | tar xzC ${DEPS}/xml2 --strip-components=1
+cd ${DEPS}/xml2
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --without-python --with-zlib=${TARGET} && make install-strip
+
+mkdir ${DEPS}/gsf
+curl -Ls https://download.gnome.org/sources/libgsf/1.14/libgsf-${VERSION_GSF}.tar.xz | tar xJC ${DEPS}/gsf --strip-components=1
+cd ${DEPS}/gsf
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+mkdir ${DEPS}/exif
+curl -Ls http://heanet.dl.sourceforge.net/project/libexif/libexif/${VERSION_EXIF}/libexif-${VERSION_EXIF}.tar.bz2 | tar xjC ${DEPS}/exif --strip-components=1
+cd ${DEPS}/exif
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+mkdir ${DEPS}/lcms2
+curl -Ls http://heanet.dl.sourceforge.net/project/lcms/lcms/${VERSION_LCMS2}/lcms2-${VERSION_LCMS2}.tar.gz | tar xzC ${DEPS}/lcms2 --strip-components=1
+cd ${DEPS}/lcms2
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+mkdir ${DEPS}/gm
+curl -Ls http://heanet.dl.sourceforge.net/project/graphicsmagick/graphicsmagick/${VERSION_GM}/GraphicsMagick-${VERSION_GM}.tar.xz | tar xJC ${DEPS}/gm --strip-components=1
+cd ${DEPS}/gm
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --without-magick-plus-plus && make install-strip
+
+mkdir ${DEPS}/jpeg
+curl -Ls http://heanet.dl.sourceforge.net/project/libjpeg-turbo/${VERSION_JPEG}/libjpeg-turbo-${VERSION_JPEG}.tar.gz | tar xzC ${DEPS}/jpeg --strip-components=1
+cd ${DEPS}/jpeg
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-jpeg8 --without-turbojpeg && make install-strip
+
+mkdir ${DEPS}/png16
+curl -Ls http://heanet.dl.sourceforge.net/project/libpng/libpng16/${VERSION_PNG16}/libpng-${VERSION_PNG16}.tar.xz | tar xJC ${DEPS}/png16 --strip-components=1
+cd ${DEPS}/png16
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+mkdir ${DEPS}/webp
+curl -Ls http://downloads.webmproject.org/releases/webp/libwebp-${VERSION_WEBP}.tar.gz | tar xzC ${DEPS}/webp --strip-components=1
+cd ${DEPS}/webp
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+mkdir ${DEPS}/tiff
+curl -Ls http://download.osgeo.org/libtiff/tiff-${VERSION_TIFF}.tar.gz | tar xzC ${DEPS}/tiff --strip-components=1
+cd ${DEPS}/tiff
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+rm ${TARGET}/lib/libtiffxx*
+
+mkdir ${DEPS}/orc
+curl -Ls http://gstreamer.freedesktop.org/data/src/orc/orc-${VERSION_ORC}.tar.xz | tar xJC ${DEPS}/orc --strip-components=1
+cd ${DEPS}/orc
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+mkdir ${DEPS}/vips
+curl -Ls http://www.vips.ecs.soton.ac.uk/supported/8.2/vips-${VERSION_VIPS}.tar.gz | tar xzC ${DEPS}/vips --strip-components=1
+cd ${DEPS}/vips
+./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
+  --disable-debug --disable-introspection --without-python --without-fftw --with-magickpackage=GraphicsMagick \
+  --with-zip-includes=${TARGET}/include --with-zip-libraries=${TARGET}/lib \
+  --with-jpeg-includes=${TARGET}/include --with-jpeg-libraries=${TARGET}/lib \
+  && make install-strip
+
+# Remove the old C++ bindings
+cd ${TARGET}/include
+rm -rf vips/vipsc++.h vips/vipscpp.h
+cd ${TARGET}/lib
+rm -rf pkgconfig .libs *.la libvipsCC*
+
+# Create JSON file of version numbers
+cd ${TARGET}
+echo "{\n\
+  \"exif\": \"${VERSION_EXIF}\",\n\
+  \"ffi\": \"${VERSION_FFI}\",\n\
+  \"glib\": \"${VERSION_GLIB}\",\n\
+  \"gsf\": \"${VERSION_GSF}\",\n\
+  \"jpeg\": \"${VERSION_JPEG}\",\n\
+  \"lcms\": \"${VERSION_LCMS2}\",\n\
+  \"gm\": \"${VERSION_GM}\",\n\
+  \"orc\": \"${VERSION_ORC}\",\n\
+  \"png\": \"${VERSION_PNG16}\",\n\
+  \"tiff\": \"${VERSION_TIFF}\",\n\
+  \"vips\": \"${VERSION_VIPS}\"\n\
+  \"webp\": \"${VERSION_WEBP}\",\n\
+  \"xml\": \"${VERSION_XML2}\",\n\
+  \"zlib\": \"${VERSION_ZLIB}\",\n\
+}" >lib/versions.json
+
+# Create .tar.gz
+GZIP=-9 tar czf /arm/libvips-${VERSION_VIPS}-arm.tar.gz include lib

packaging/build.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# Is docker available?
+
+if ! type docker >/dev/null; then
+  echo "Please install docker"
+  exit 1
+fi
+
+# TODO: docker v1.9.0 will allow build-time args - https://github.com/docker/docker/pull/15182
+
+# Windows
+
+docker build -t vips-dev-win win
+WIN_CONTAINER_ID=$(docker run -d vips-dev-win)
+docker cp $WIN_CONTAINER_ID:/libvips-8.2.2-win.tar.gz .
+docker rm $WIN_CONTAINER_ID
+
+# Linux
+
+docker build -t vips-dev-lin lin
+LIN_CONTAINER_ID=$(docker run -d vips-dev-lin)
+docker cp $LIN_CONTAINER_ID:/libvips-8.2.2-lin.tar.gz .
+docker rm $LIN_CONTAINER_ID
+
+# Checksums
+
+sha256sum *.tar.gz

packaging/lin/Dockerfile

@@ -0,0 +1,139 @@
+FROM debian:wheezy
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+# Build dependencies
+RUN apt-get update && apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo
+
+# Create working directories
+ENV DEPS=/deps \
+    TARGET=/target
+RUN mkdir ${DEPS} && mkdir ${TARGET}
+
+# Common build paths and flags
+ENV PKG_CONFIG_PATH=${PKG_CONFIG_PATH}:${TARGET}/lib/pkgconfig \
+    PATH=${PATH}:${TARGET}/bin \
+    CPPFLAGS=-I${TARGET}/include \
+    LDFLAGS=-L${TARGET}/lib \
+    CFLAGS="-O3" \
+    CXXFLAGS="-O3"
+
+# Dependency version numbers
+ENV VERSION_ZLIB=1.2.8 \
+    VERSION_FFI=3.2.1 \
+    VERSION_GLIB=2.47.5 \
+    VERSION_XML2=2.9.3 \
+    VERSION_GSF=1.14.34 \
+    VERSION_EXIF=0.6.21 \
+    VERSION_LCMS2=2.7 \
+    VERSION_GM=1.3.23 \
+    VERSION_JPEG=1.4.2 \
+    VERSION_PNG16=1.6.21 \
+    VERSION_WEBP=0.5.0 \
+    VERSION_TIFF=4.0.6 \
+    VERSION_ORC=0.4.24 \
+    VERSION_VIPS=8.2.2
+
+RUN mkdir ${DEPS}/zlib
+RUN curl -Ls http://zlib.net/zlib-${VERSION_ZLIB}.tar.xz | tar xJC ${DEPS}/zlib --strip-components=1
+WORKDIR ${DEPS}/zlib
+RUN ./configure --prefix=${TARGET} && make install
+RUN rm ${TARGET}/lib/libz.a
+
+RUN mkdir ${DEPS}/ffi
+RUN curl -Ls ftp://sourceware.org/pub/libffi/libffi-${VERSION_FFI}.tar.gz | tar xzC ${DEPS}/ffi --strip-components=1
+WORKDIR ${DEPS}/ffi
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-builddir && make install-strip
+
+RUN mkdir ${DEPS}/glib
+RUN curl -Ls https://download.gnome.org/sources/glib/2.47/glib-${VERSION_GLIB}.tar.xz | tar xJC ${DEPS}/glib --strip-components=1
+WORKDIR ${DEPS}/glib
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-pcre=internal && make install-strip
+
+RUN mkdir ${DEPS}/xml2
+RUN curl -Ls http://xmlsoft.org/sources/libxml2-${VERSION_XML2}.tar.gz | tar xzC ${DEPS}/xml2 --strip-components=1
+WORKDIR ${DEPS}/xml2
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --without-python --with-zlib=${TARGET} && make install-strip
+
+RUN mkdir ${DEPS}/gsf
+RUN curl -Ls https://download.gnome.org/sources/libgsf/1.14/libgsf-${VERSION_GSF}.tar.xz | tar xJC ${DEPS}/gsf --strip-components=1
+WORKDIR ${DEPS}/gsf
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+RUN mkdir ${DEPS}/exif
+RUN curl -Ls http://heanet.dl.sourceforge.net/project/libexif/libexif/${VERSION_EXIF}/libexif-${VERSION_EXIF}.tar.bz2 | tar xjC ${DEPS}/exif --strip-components=1
+WORKDIR ${DEPS}/exif
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+RUN mkdir ${DEPS}/lcms2
+RUN curl -Ls http://heanet.dl.sourceforge.net/project/lcms/lcms/${VERSION_LCMS2}/lcms2-${VERSION_LCMS2}.tar.gz | tar xzC ${DEPS}/lcms2 --strip-components=1
+WORKDIR ${DEPS}/lcms2
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+RUN mkdir ${DEPS}/gm
+RUN curl -Ls http://heanet.dl.sourceforge.net/project/graphicsmagick/graphicsmagick/${VERSION_GM}/GraphicsMagick-${VERSION_GM}.tar.xz | tar xJC ${DEPS}/gm --strip-components=1
+WORKDIR ${DEPS}/gm
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --without-magick-plus-plus && make install-strip
+
+RUN mkdir ${DEPS}/jpeg
+RUN curl -Ls http://heanet.dl.sourceforge.net/project/libjpeg-turbo/${VERSION_JPEG}/libjpeg-turbo-${VERSION_JPEG}.tar.gz | tar xzC ${DEPS}/jpeg --strip-components=1
+WORKDIR ${DEPS}/jpeg
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-jpeg8 --without-turbojpeg && make install-strip
+
+RUN mkdir ${DEPS}/png16
+RUN curl -Ls http://heanet.dl.sourceforge.net/project/libpng/libpng16/${VERSION_PNG16}/libpng-${VERSION_PNG16}.tar.xz | tar xJC ${DEPS}/png16 --strip-components=1
+WORKDIR ${DEPS}/png16
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+RUN mkdir ${DEPS}/webp
+RUN curl -Ls http://downloads.webmproject.org/releases/webp/libwebp-${VERSION_WEBP}.tar.gz | tar xzC ${DEPS}/webp --strip-components=1
+WORKDIR ${DEPS}/webp
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+RUN mkdir ${DEPS}/tiff
+RUN curl -Ls http://download.osgeo.org/libtiff/tiff-${VERSION_TIFF}.tar.gz | tar xzC ${DEPS}/tiff --strip-components=1
+WORKDIR ${DEPS}/tiff
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+RUN rm ${TARGET}/lib/libtiffxx*
+
+RUN mkdir ${DEPS}/orc
+RUN curl -Ls http://gstreamer.freedesktop.org/data/src/orc/orc-${VERSION_ORC}.tar.xz | tar xJC ${DEPS}/orc --strip-components=1
+WORKDIR ${DEPS}/orc
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+
+RUN mkdir ${DEPS}/vips
+RUN curl -Ls http://www.vips.ecs.soton.ac.uk/supported/8.2/vips-${VERSION_VIPS}.tar.gz | tar xzC ${DEPS}/vips --strip-components=1
+WORKDIR ${DEPS}/vips
+RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
+  --disable-debug --disable-introspection --without-python --without-fftw --with-magickpackage=GraphicsMagick \
+  --with-zip-includes=${TARGET}/include --with-zip-libraries=${TARGET}/lib \
+  --with-jpeg-includes=${TARGET}/include --with-jpeg-libraries=${TARGET}/lib \
+  && make install-strip
+
+# Remove the old C++ bindings
+WORKDIR ${TARGET}/include
+RUN rm -rf vips/vipsc++.h vips/vipscpp.h
+WORKDIR ${TARGET}/lib
+RUN rm -rf pkgconfig .libs *.la libvipsCC*
+
+# Create JSON file of version numbers
+WORKDIR ${TARGET}
+RUN echo "{\n\
+  \"exif\": \"${VERSION_EXIF}\",\n\
+  \"ffi\": \"${VERSION_FFI}\",\n\
+  \"glib\": \"${VERSION_GLIB}\",\n\
+  \"gsf\": \"${VERSION_GSF}\",\n\
+  \"jpeg\": \"${VERSION_JPEG}\",\n\
+  \"lcms\": \"${VERSION_LCMS2}\",\n\
+  \"gm\": \"${VERSION_GM}\",\n\
+  \"orc\": \"${VERSION_ORC}\",\n\
+  \"png\": \"${VERSION_PNG16}\",\n\
+  \"tiff\": \"${VERSION_TIFF}\",\n\
+  \"vips\": \"${VERSION_VIPS}\"\n\
+  \"webp\": \"${VERSION_WEBP}\",\n\
+  \"xml\": \"${VERSION_XML2}\",\n\
+  \"zlib\": \"${VERSION_ZLIB}\",\n\
+}" >lib/versions.json
+
+# Create .tar.gz
+WORKDIR ${TARGET}
+RUN GZIP=-9 tar czf /libvips-${VERSION_VIPS}-lin.tar.gz include lib

packaging/test.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+
+# Verify docker is available
+if ! type docker >/dev/null; then
+  echo "Please install docker"
+  exit 1
+fi
+
+test="npm run clean; npm install --unsafe-perm; npm test"
+
+# Debian 7, 8
+# Ubuntu 12.04, 14.04
+for dist in wheezy jessie precise trusty; do
+  echo "Testing $dist..."
+  if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/$dist:0.12 >packaging/$dist.log 2>&1 sh -c "cd /v; ./packaging/test/debian.sh; $test";
+  then echo "$dist OK"
+  else echo "$dist fail" && cat packaging/$dist.log
+  fi
+done
+
+# Centos 6
+echo "Testing centos6..."
+if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/centos6:0.12 >packaging/centos6.log 2>&1 sh -c "cd /v; source ./packaging/test/centos6.sh; ./preinstall.sh; $test";
+then echo "centos6 OK"
+else echo "centos6 fail" && cat packaging/centos6.log
+fi
+
+# Centos 7
+# Fedora 20, 21
+for dist in centos7 fedora20 fedora21; do
+  echo "Testing $dist..."
+  if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/$dist:0.12 >packaging/$dist.log 2>&1 sh -c "cd /v; $test";
+  then echo "$dist OK"
+  else echo "$dist fail" && cat packaging/$dist.log
+  fi
+done
+
+# openSUSE 13.2
+echo "Testing opensuse..."
+if docker run -i -t --rm -v $PWD:/v opensuse:13.2 >packaging/opensuse.log 2>&1 /bin/sh -c "cd /v; ./packaging/test/opensuse.sh; $test";
+then echo "opensuse OK"
+else echo "opensuse fail" && cat packaging/opensuse.log
+fi
+
+# Archlinux 2015.06.01
+echo "Testing archlinux..."
+if docker run -i -t --rm -v $PWD:/v base/archlinux:2015.06.01 >packaging/archlinux.log 2>&1 sh -c "cd /v; ./packaging/test/archlinux.sh; $test";
+then echo "archlinux OK"
+else echo "archlinux fail" && cat packaging/archlinux.log
+fi
+
+# Alpine
+echo "Testing alpine..."
+if docker run -i -t --rm -v $PWD:/v -e "SHARP_TEST_WITHOUT_CACHE=0" alpine:edge >packaging/alpine.log 2>&1 sh -c "cd /v; ./packaging/test/alpine.sh; $test";
+then echo "alpine OK"
+else echo "alpine fail" && cat packaging/alpine.log
+fi

packaging/test/alpine.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Install build dependencies
+apk add --update make gcc g++ python nodejs
+
+# Install libvips with build headers and dependencies
+apk add libvips-dev --update --repository https://s3.amazonaws.com/wjordan-apk --allow-untrusted

packaging/test/archlinux.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+# Install Node.js on Archlinux
+pacman -Sy --noconfirm gcc make python2 nodejs npm | cat
+ln -s /usr/bin/python2 /usr/bin/python

packaging/test/centos6.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+# Install C++11 compatible version of g++ on Centos 6
+curl -o /etc/yum.repos.d/devtools-1.1.repo http://people.centos.org/tru/devtools-1.1/devtools-1.1.repo
+yum install -y devtoolset-1.1
+export CC=/opt/centos/devtoolset-1.1/root/usr/bin/gcc
+export CPP=/opt/centos/devtoolset-1.1/root/usr/bin/cpp
+export CXX=/opt/centos/devtoolset-1.1/root/usr/bin/c++

packaging/test/debian.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+# Install pkg-config on Debian/Ubuntu
+apt-get update
+apt-get install -y pkg-config

packaging/test/opensuse.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Install Node.js on openSUSE 13.2
+zypper addrepo http://download.opensuse.org/repositories/devel:languages:nodejs/openSUSE_13.2/devel:languages:nodejs.repo
+zypper --gpg-auto-import-keys refresh
+zypper --non-interactive install gcc-c++ make nodejs-devel nodejs-npm
+npm install -g npm

packaging/win/Dockerfile

@@ -0,0 +1,18 @@
+FROM ubuntu:precise
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+RUN apt-get update && apt-get install -y curl zip
+
+# Fetch and unzip
+RUN mkdir /vips
+WORKDIR /vips
+RUN curl -O http://www.vips.ecs.soton.ac.uk/supported/8.2/win32/vips-dev-w64-8.2.2.zip
+RUN unzip vips-dev-w64-8.2.2.zip
+
+# Clean and zip
+WORKDIR /vips/vips-dev-8.2
+RUN rm bin/libvipsCC-42.dll bin/libvips-cpp-42.dll bin/libgsf-win32-1-114.dll bin/libstdc++-6.dll
+RUN cp bin/*.dll lib/
+RUN cp -r lib64/* lib/
+
+RUN GZIP=-9 tar czf /libvips-8.2.2-win.tar.gz include lib/glib-2.0 lib/libvips.lib lib/libglib-2.0.lib lib/libgobject-2.0.lib lib/*.dll

preinstall.sh

@@ -0,0 +1,322 @@
+#!/bin/sh
+
+# This script is no longer required on most
+# 64-bit Linux systems when using sharp v0.12.0+
+
+# See http://sharp.dimens.io/page/install#linux
+
+# If you really need this script, it will attempt to
+# globally install libvips if not already available.
+
+# Supports:
+# * Debian Linux
+#   * Debian 7, 8
+#   * Ubuntu 12.04, 14.04, 14.10, 15.04, 15.10
+#   * Mint 13, 17
+#   * Elementary 0.3
+# * Red Hat Linux
+#   * RHEL/Centos/Scientific 6, 7
+#   * Fedora 21, 22, 23
+#   * Amazon Linux 2015.03, 2015.09
+# * OpenSuse 13
+
+vips_version_minimum=8.2.2
+vips_version_latest_major_minor=8.2
+vips_version_latest_patch=2
+
+openslide_version_minimum=3.4.0
+openslide_version_latest_major_minor=3.4
+openslide_version_latest_patch=1
+
+install_libvips_from_source() {
+  echo "Compiling libvips $vips_version_latest_major_minor.$vips_version_latest_patch from source"
+  curl -O http://www.vips.ecs.soton.ac.uk/supported/$vips_version_latest_major_minor/vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
+  tar zvxf vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
+  cd vips-$vips_version_latest_major_minor.$vips_version_latest_patch
+  ./configure --disable-debug --disable-docs --disable-static --disable-introspection --disable-dependency-tracking --enable-cxx=yes --without-python --without-orc --without-fftw $1
+  make
+  make install
+  cd ..
+  rm -rf vips-$vips_version_latest_major_minor.$vips_version_latest_patch
+  rm vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
+  ldconfig
+  echo "Installed libvips $(PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig pkg-config --modversion vips)"
+}
+
+install_libopenslide_from_source() {
+  echo "Compiling openslide $openslide_version_latest_major_minor.$openslide_version_latest_patch from source"
+  curl -O -L https://github.com/openslide/openslide/releases/download/v$openslide_version_latest_major_minor.$openslide_version_latest_patch/openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch.tar.gz
+  tar xzvf openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch.tar.gz
+  cd openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch
+  PKG_CONFIG_PATH=$pkg_config_path ./configure $1
+  make
+  make install
+  cd ..
+  rm -rf openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch
+  rm openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch.tar.gz
+  ldconfig
+  echo "Installed libopenslide $openslide_version_latest_major_minor.$openslide_version_latest_patch"
+}
+
+sorry() {
+  echo "Sorry, I don't yet know how to install lib$1 on $2"
+  exit 1
+}
+
+pkg_config_path="$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig"
+
+check_if_library_exists() {
+  PKG_CONFIG_PATH=$pkg_config_path pkg-config --exists $1
+  if [ $? -eq 0 ]; then
+    version_found=$(PKG_CONFIG_PATH=$pkg_config_path pkg-config --modversion $1)
+    PKG_CONFIG_PATH=$pkg_config_path pkg-config --atleast-version=$2 $1
+    if [ $? -eq 0 ]; then
+      # Found suitable version of libvips
+      echo "Found lib$1 $version_found"
+      return 1
+    fi
+    echo "Found lib$1 $version_found but require $2"
+  else
+    echo "Could not find lib$1 using a PKG_CONFIG_PATH of '$pkg_config_path'"
+  fi
+  return 0
+}
+
+enable_openslide=0
+# Is libvips already installed, and is it at least the minimum required version?
+if [ $# -eq 1 ]; then
+  if [ "$1" = "--with-openslide" ]; then
+    echo "Installing vips with openslide support"
+    enable_openslide=1
+  else
+    echo "Sorry, $1 is not supported. Did you mean --with-openslide?"
+    exit 1
+  fi
+fi
+
+if ! type pkg-config >/dev/null; then
+  sorry "vips" "a system without pkg-config"
+fi
+
+openslide_exists=0
+if [ $enable_openslide -eq 1 ]; then
+  check_if_library_exists "openslide" "$openslide_version_minimum"
+  openslide_exists=$?
+fi
+
+check_if_library_exists "vips" "$vips_version_minimum"
+vips_exists=$?
+if [ $vips_exists -eq 1 ] && [ $enable_openslide -eq 1 ]; then
+  if [ $openslide_exists -eq 1 ]; then
+    # Check if vips compiled with openslide support
+    vips_with_openslide=`vips list classes | grep -i opensli`
+    if [ -z $vips_with_openslide ]; then
+      echo "Vips compiled without openslide support."
+    else
+      exit 0
+    fi
+  fi
+elif [ $vips_exists -eq 1 ] && [ $enable_openslide -eq 0 ]; then
+  exit 0
+fi
+
+# Verify root/sudo access
+if [ "$(id -u)" -ne "0" ]; then
+  echo "Sorry, I need root/sudo access to continue"
+  exit 1
+fi
+
+# Deprecation warning
+if [ "$(arch)" == "x86_64" ]; then
+  echo "This script is no longer required on most 64-bit Linux systems when using sharp v0.12.0+"
+fi
+
+# OS-specific installations of libopenslide follows
+# Either openslide does not exist, or vips is installed without openslide support
+if [ $enable_openslide -eq 1 ] && [ -z $vips_with_openslide ] && [ $openslide_exists -eq 0 ]; then
+  if [ -f /etc/debian_version ]; then
+    # Debian Linux
+    DISTRO=$(lsb_release -c -s)
+    echo "Detected Debian Linux '$DISTRO'"
+    case "$DISTRO" in
+      jessie|vivid|wily)
+        # Debian 8, Ubuntu 15
+        echo "Installing libopenslide via apt-get"
+        apt-get install -y libopenslide-dev
+        ;;
+      trusty|utopic|qiana|rebecca|rafaela|freya)
+        # Ubuntu 14, Mint 17
+        echo "Installing libopenslide dependencies via apt-get"
+        apt-get install -y automake build-essential curl zlib1g-dev libopenjpeg-dev libpng12-dev libjpeg-dev libtiff5-dev libgdk-pixbuf2.0-dev libxml2-dev libsqlite3-dev libcairo2-dev libglib2.0-dev sqlite3 libsqlite3-dev
+        install_libopenslide_from_source
+        ;;
+      precise|wheezy|maya)
+        # Debian 7, Ubuntu 12.04, Mint 13
+        echo "Installing libopenslide dependencies via apt-get"
+        apt-get install -y automake build-essential curl zlib1g-dev libopenjpeg-dev libpng12-dev libjpeg-dev libtiff5-dev libgdk-pixbuf2.0-dev libxml2-dev libsqlite3-dev libcairo2-dev libglib2.0-dev sqlite3 libsqlite3-dev
+        install_libopenslide_from_source
+        ;;
+      *)
+        # Unsupported Debian-based OS
+        sorry "openslide" "Debian-based $DISTRO"
+        ;;
+    esac
+  elif [ -f /etc/redhat-release ]; then
+    # Red Hat Linux
+    RELEASE=$(cat /etc/redhat-release)
+    echo "Detected Red Hat Linux '$RELEASE'"
+    case $RELEASE in
+      "Red Hat Enterprise Linux release 7."*|"CentOS Linux release 7."*|"Scientific Linux release 7."*)
+        # RHEL/CentOS 7
+        echo "Installing libopenslide dependencies via yum"
+        yum groupinstall -y "Development Tools"
+        yum install -y tar curl libpng-devel libjpeg-devel libxml2-devel zlib-devel openjpeg-devel libtiff-devel gdk-pixbuf2-devel sqlite-devel cairo-devel glib2-devel
+        install_libopenslide_from_source "--prefix=/usr"
+        ;;
+      "Red Hat Enterprise Linux release 6."*|"CentOS release 6."*|"Scientific Linux release 6."*)
+        # RHEL/CentOS 6
+        echo "Installing libopenslide dependencies via yum"
+        yum groupinstall -y "Development Tools"
+        yum install -y tar curl libpng-devel libjpeg-devel libxml2-devel zlib-devel openjpeg-devel libtiff-devel gdk-pixbuf2-devel sqlite-devel cairo-devel glib2-devel
+        install_libopenslide_from_source "--prefix=/usr"
+        ;;
+      "Fedora release 21 "*|"Fedora release 22 "*)
+        # Fedora 21, 22
+        echo "Installing libopenslide via yum"
+        yum install -y openslide-devel
+        ;;
+      *)
+        # Unsupported RHEL-based OS
+        sorry "openslide" "$RELEASE"
+        ;;
+    esac
+  elif [ -f /etc/os-release ]; then
+    RELEASE=$(cat /etc/os-release | grep VERSION)
+    echo "Detected OpenSuse Linux '$RELEASE'"
+    case $RELEASE in
+      *"13.2"*)
+      echo "Installing libopenslide via zypper"
+      zypper --gpg-auto-import-keys install -y libopenslide-devel
+      ;;
+    esac
+  elif [ -f /etc/SuSE-brand ]; then
+    RELEASE=$(cat /etc/SuSE-brand | grep VERSION)
+    echo "Detected OpenSuse Linux '$RELEASE'"
+    case $RELEASE in
+      *"13.1")
+      echo "Installing libopenslide dependencies via zypper"
+      zypper --gpg-auto-import-keys install -y --type pattern devel_basis
+      zypper --gpg-auto-import-keys install -y tar curl libpng16-devel libjpeg-turbo libjpeg8-devel libxml2-devel zlib-devel openjpeg-devel libtiff-devel libgdk_pixbuf-2_0-0 sqlite3-devel cairo-devel glib2-devel
+      install_libopenslide_from_source
+      ;;
+    esac
+  else
+    # Unsupported OS
+    sorry "openslide" "$(uname -a)"
+  fi
+fi
+
+# OS-specific installations of libvips follows
+
+if [ -f /etc/debian_version ]; then
+  # Debian Linux
+  DISTRO=$(lsb_release -c -s)
+  echo "Detected Debian Linux '$DISTRO'"
+  case "$DISTRO" in
+    jessie|trusty|utopic|vivid|wily|xenial|qiana|rebecca|rafaela|freya)
+      # Debian 8, Ubuntu 14.04+, Mint 17
+      echo "Installing libvips dependencies via apt-get"
+      apt-get install -y automake build-essential gobject-introspection gtk-doc-tools libglib2.0-dev libjpeg-dev libpng12-dev libwebp-dev libtiff5-dev libexif-dev libgsf-1-dev liblcms2-dev libxml2-dev swig libmagickcore-dev curl
+      install_libvips_from_source
+      ;;
+    precise|wheezy|maya)
+      # Debian 7, Ubuntu 12.04, Mint 13
+      echo "Installing libvips dependencies via apt-get"
+      add-apt-repository -y ppa:lyrasis/precise-backports
+      apt-get update
+      apt-get install -y automake build-essential gobject-introspection gtk-doc-tools libglib2.0-dev libjpeg-dev libpng12-dev libwebp-dev libtiff4-dev libexif-dev libgsf-1-dev liblcms2-dev libxml2-dev swig libmagickcore-dev curl
+      install_libvips_from_source
+      ;;
+    *)
+      # Unsupported Debian-based OS
+      sorry "vips" "Debian-based $DISTRO"
+      ;;
+  esac
+elif [ -f /etc/redhat-release ]; then
+  # Red Hat Linux
+  RELEASE=$(cat /etc/redhat-release)
+  echo "Detected Red Hat Linux '$RELEASE'"
+  case $RELEASE in
+    "Red Hat Enterprise Linux release 7."*|"CentOS Linux release 7."*|"Scientific Linux release 7."*)
+      # RHEL/CentOS 7
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y tar curl gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel libgsf-devel lcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    "Red Hat Enterprise Linux release 6."*|"CentOS release 6."*|"Scientific Linux release 6."*)
+      # RHEL/CentOS 6
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y tar curl gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel libgsf-devel lcms-devel ImageMagick-devel
+      yum install -y http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm
+      yum install -y --enablerepo=nux-dextop gobject-introspection-devel
+      yum install -y http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
+      yum install -y --enablerepo=remi libwebp-devel
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    "Fedora"*)
+      # Fedora 21, 22, 23
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y gcc-c++ gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel lcms-devel ImageMagick-devel gobject-introspection-devel libwebp-devel curl
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    *)
+      # Unsupported RHEL-based OS
+      sorry "vips" "$RELEASE"
+      ;;
+  esac
+elif [ -f /etc/system-release ]; then
+  # Probably Amazon Linux
+  RELEASE=$(cat /etc/system-release)
+  case $RELEASE in
+    "Amazon Linux AMI release 2015.03"|"Amazon Linux AMI release 2015.09")
+      # Amazon Linux
+      echo "Detected '$RELEASE'"
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel libgsf-devel lcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel curl
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    *)
+      # Unsupported Amazon Linux version
+      sorry "vips" "$RELEASE"
+      ;;
+  esac
+elif [ -f /etc/os-release ]; then
+  RELEASE=$(cat /etc/os-release | grep VERSION)
+  echo "Detected OpenSuse Linux '$RELEASE'"
+  case $RELEASE in
+    *"13.2"*)
+    echo "Installing libvips dependencies via zypper"
+    zypper --gpg-auto-import-keys install -y --type pattern devel_basis
+    zypper --gpg-auto-import-keys install -y tar curl gtk-doc libxml2-devel libjpeg-turbo libjpeg8-devel libpng16-devel libtiff-devel libexif-devel liblcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel
+    install_libvips_from_source
+    ;;
+  esac
+elif [ -f /etc/SuSE-brand ]; then
+  RELEASE=$(cat /etc/SuSE-brand | grep VERSION)
+  echo "Detected OpenSuse Linux '$RELEASE'"
+  case $RELEASE in
+    *"13.1")
+    echo "Installing libvips dependencies via zypper"
+    zypper --gpg-auto-import-keys install -y --type pattern devel_basis
+    zypper --gpg-auto-import-keys install -y tar curl gtk-doc libxml2-devel libjpeg-turbo libjpeg8-devel libpng16-devel libtiff-devel libexif-devel liblcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel
+    install_libvips_from_source
+    ;;
+  esac
+else
+  # Unsupported OS
+  sorry "vips" "$(uname -a)"
+fi

src/common.cc

@@ -0,0 +1,188 @@
+#include <cstdlib>
+#include <string>
+#include <string.h>
+#include <vips/vips8>
+
+#include "common.h"
+
+// Verify platform and compiler compatibility
+
+#if (VIPS_MAJOR_VERSION < 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 2))
+#error libvips version 8.2.0+ required - see http://sharp.dimens.io/page/install
+#endif
+
+#if ((!defined(__clang__)) && defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)))
+#error GCC version 4.6+ is required for C++11 features - see http://sharp.dimens.io/page/install#prerequisites
+#endif
+
+#if (defined(__clang__) && defined(__has_feature))
+#if (!__has_feature(cxx_range_for))
+#error clang version 3.0+ is required for C++11 features - see http://sharp.dimens.io/page/install#prerequisites
+#endif
+#endif
+
+#define EXIF_IFD0_ORIENTATION "exif-ifd0-Orientation"
+
+using vips::VImage;
+
+namespace sharp {
+
+  // How many tasks are in the queue?
+  volatile int counterQueue = 0;
+
+  // How many tasks are being processed?
+  volatile int counterProcess = 0;
+
+  // Filename extension checkers
+  static bool EndsWith(std::string const &str, std::string const &end) {
+    return str.length() >= end.length() && 0 == str.compare(str.length() - end.length(), end.length(), end);
+  }
+  bool IsJpeg(std::string const &str) {
+    return EndsWith(str, ".jpg") || EndsWith(str, ".jpeg") || EndsWith(str, ".JPG") || EndsWith(str, ".JPEG");
+  }
+  bool IsPng(std::string const &str) {
+    return EndsWith(str, ".png") || EndsWith(str, ".PNG");
+  }
+  bool IsWebp(std::string const &str) {
+    return EndsWith(str, ".webp") || EndsWith(str, ".WEBP");
+  }
+  bool IsTiff(std::string const &str) {
+    return EndsWith(str, ".tif") || EndsWith(str, ".tiff") || EndsWith(str, ".TIF") || EndsWith(str, ".TIFF");
+  }
+  bool IsDz(std::string const &str) {
+    return EndsWith(str, ".dzi") || EndsWith(str, ".DZI");
+  }
+
+  /*
+    Provide a string identifier for the given image type.
+  */
+  std::string ImageTypeId(ImageType const imageType) {
+    std::string id;
+    switch (imageType) {
+      case ImageType::JPEG: id = "jpeg"; break;
+      case ImageType::PNG: id = "png"; break;
+      case ImageType::WEBP: id = "webp"; break;
+      case ImageType::TIFF: id = "tiff"; break;
+      case ImageType::MAGICK: id = "magick"; break;
+      case ImageType::OPENSLIDE: id = "openslide"; break;
+      case ImageType::PPM: id = "ppm"; break;
+      case ImageType::FITS: id = "fits"; break;
+      case ImageType::RAW: id = "raw"; break;
+      case ImageType::UNKNOWN: id = "unknown"; break;
+    }
+    return id;
+  }
+
+  /*
+    Determine image format of a buffer.
+  */
+  ImageType DetermineImageType(void *buffer, size_t const length) {
+    ImageType imageType = ImageType::UNKNOWN;
+    char const *load = vips_foreign_find_load_buffer(buffer, length);
+    if (load != NULL) {
+      std::string const loader = load;
+      if (EndsWith(loader, "JpegBuffer")) {
+        imageType = ImageType::JPEG;
+      } else if (EndsWith(loader, "PngBuffer")) {
+        imageType = ImageType::PNG;
+      } else if (EndsWith(loader, "WebpBuffer")) {
+        imageType = ImageType::WEBP;
+      } else if (EndsWith(loader, "TiffBuffer")) {
+        imageType = ImageType::TIFF;
+      } else if (EndsWith(loader, "MagickBuffer")) {
+        imageType = ImageType::MAGICK;
+      }
+    }
+    return imageType;
+  }
+
+  /*
+    Determine image format, reads the first few bytes of the file
+  */
+  ImageType DetermineImageType(char const *file) {
+    ImageType imageType = ImageType::UNKNOWN;
+    char const *load = vips_foreign_find_load(file);
+    if (load != nullptr) {
+      std::string const loader = load;
+      if (EndsWith(loader, "JpegFile")) {
+        imageType = ImageType::JPEG;
+      } else if (EndsWith(loader, "Png")) {
+        imageType = ImageType::PNG;
+      } else if (EndsWith(loader, "WebpFile")) {
+        imageType = ImageType::WEBP;
+      } else if (EndsWith(loader, "Openslide")) {
+        imageType = ImageType::OPENSLIDE;
+      } else if (EndsWith(loader, "TiffFile")) {
+        imageType = ImageType::TIFF;
+      } else if (EndsWith(loader, "Ppm")) {
+        imageType = ImageType::PPM;
+      } else if (EndsWith(loader, "Fits")) {
+        imageType = ImageType::FITS;
+      } else if (EndsWith(loader, "Magick") || EndsWith(loader, "MagickFile")) {
+        imageType = ImageType::MAGICK;
+      }
+    }
+    return imageType;
+  }
+
+  /*
+    Does this image have an embedded profile?
+  */
+  bool HasProfile(VImage image) {
+    return (image.get_typeof(VIPS_META_ICC_NAME) != 0) ? TRUE : FALSE;
+  }
+
+  /*
+    Does this image have an alpha channel?
+    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)
+    );
+  }
+
+  /*
+    Get EXIF Orientation of image, if any.
+  */
+  int ExifOrientation(VImage image) {
+    int orientation = 0;
+    if (image.get_typeof(EXIF_IFD0_ORIENTATION) != 0) {
+      char const *exif = image.get_string(EXIF_IFD0_ORIENTATION);
+      if (exif != nullptr) {
+        orientation = atoi(&exif[0]);
+      }
+    }
+    return orientation;
+  }
+
+  /*
+    Set EXIF Orientation of image.
+  */
+  void SetExifOrientation(VImage image, int const orientation) {
+    char exif[3];
+    g_snprintf(exif, sizeof(exif), "%d", orientation);
+    image.set(EXIF_IFD0_ORIENTATION, exif);
+  }
+
+  /*
+    Remove EXIF Orientation from image.
+  */
+  void RemoveExifOrientation(VImage image) {
+    SetExifOrientation(image, 0);
+  }
+
+  /*
+    Called when a Buffer undergoes GC, required to support mixed runtime libraries in Windows
+  */
+  void FreeCallback(char* data, void* hint) {
+    if (data != nullptr) {
+      g_free(data);
+    }
+  }
+
+} // namespace sharp

src/common.h

@@ -0,0 +1,85 @@
+#ifndef SRC_COMMON_H_
+#define SRC_COMMON_H_
+
+#include <string>
+#include <vips/vips8>
+
+using vips::VImage;
+
+namespace sharp {
+
+  enum class ImageType {
+    UNKNOWN,
+    JPEG,
+    PNG,
+    WEBP,
+    TIFF,
+    MAGICK,
+    OPENSLIDE,
+    PPM,
+    FITS,
+    RAW
+  };
+
+  // How many tasks are in the queue?
+  extern volatile int counterQueue;
+
+  // How many tasks are being processed?
+  extern volatile int counterProcess;
+
+  // Filename extension checkers
+  bool IsJpeg(std::string const &str);
+  bool IsPng(std::string const &str);
+  bool IsWebp(std::string const &str);
+  bool IsTiff(std::string const &str);
+  bool IsDz(std::string const &str);
+
+  /*
+    Provide a string identifier for the given image type.
+  */
+  std::string ImageTypeId(ImageType const imageType);
+
+  /*
+    Determine image format of a buffer.
+  */
+  ImageType DetermineImageType(void *buffer, size_t const length);
+
+  /*
+    Determine image format of a file.
+  */
+  ImageType DetermineImageType(char const *file);
+
+  /*
+    Does this image have an embedded profile?
+  */
+  bool HasProfile(VImage image);
+
+  /*
+    Does this image have an alpha channel?
+    Uses colour space interpretation with number of channels to guess this.
+  */
+  bool HasAlpha(VImage image);
+
+  /*
+    Get EXIF Orientation of image, if any.
+  */
+  int ExifOrientation(VImage image);
+
+  /*
+    Set EXIF Orientation of image.
+  */
+  void SetExifOrientation(VImage image, int const orientation);
+
+  /*
+    Remove EXIF Orientation from image.
+  */
+  void RemoveExifOrientation(VImage image);
+
+  /*
+    Called when a Buffer undergoes GC, required to support mixed runtime libraries in Windows
+  */
+  void FreeCallback(char* data, void* hint);
+
+}  // namespace sharp
+
+#endif  // SRC_COMMON_H_

src/libvips/cplusplus/VError.cpp

@@ -0,0 +1,52 @@
+// Code for error type
+
+/*
+
+    Copyright (C) 1991-2001 The National Gallery
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301  USA
+
+ */
+
+/*
+
+    These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
+
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /*HAVE_CONFIG_H*/
+#include <vips/intl.h>
+
+#include <iostream>
+
+#include <vips/vips8>
+
+VIPS_NAMESPACE_START
+
+std::ostream &operator<<( std::ostream &file, const VError &err )
+{
+	err.ostream_print( file );
+	return( file );
+}
+
+void VError::ostream_print( std::ostream &file ) const
+{
+	file << _what;
+}
+
+VIPS_NAMESPACE_END

src/libvips/cplusplus/VImage.cpp

@@ -0,0 +1,714 @@
+/* Object part of VImage class
+ *
+ * 30/12/14
+ * 	- allow set enum value from string
+ */
+
+/*
+
+    Copyright (C) 1991-2001 The National Gallery
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301  USA
+
+ */
+
+/*
+
+    These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
+
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /*HAVE_CONFIG_H*/
+#include <vips/intl.h>
+
+#include <vips/vips8>
+
+#include <vips/debug.h>
+
+/*
+#define VIPS_DEBUG
+#define VIPS_DEBUG_VERBOSE
+ */
+
+VIPS_NAMESPACE_START
+
+std::vector<double> 
+to_vectorv( int n, ... )
+{
+	std::vector<double> vector( n );
+	va_list ap;
+
+	va_start( ap, n );
+	for( int i = 0; i < n; i++ )
+		vector[i] = va_arg( ap, double );
+	va_end( ap );
+
+	return( vector );
+}
+
+std::vector<double> 
+to_vector( double value )
+{
+	return( to_vectorv( 1, value ) );
+}
+
+std::vector<double> 
+to_vector( int n, double array[] )
+{
+	std::vector<double> vector( n );
+
+	for( int i = 0; i < n; i++ )
+		vector[i] = array[i];
+
+	return( vector );
+}
+
+std::vector<double> 
+negate( std::vector<double> vector )
+{
+	std::vector<double> new_vector( vector.size() ); 
+
+	for( unsigned int i = 0; i < vector.size(); i++ )
+		new_vector[i] = vector[i] * -1;
+
+	return( new_vector );
+}
+
+std::vector<double> 
+invert( std::vector<double> vector )
+{
+	std::vector<double> new_vector( vector.size() );
+
+	for( unsigned int i = 0; i < vector.size(); i++ )
+		new_vector[i] = 1.0 / vector[i];
+
+	return( new_vector );
+}
+
+VOption::~VOption()
+{
+	std::list<Pair *>::iterator i;
+
+	for( i = options.begin(); i != options.end(); ++i ) 
+		delete *i;
+}
+
+// input bool
+VOption *
+VOption::set( const char *name, bool value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = true;
+	g_value_init( &pair->value, G_TYPE_BOOLEAN );
+	g_value_set_boolean( &pair->value, value );
+	options.push_back( pair );
+
+	return( this );
+}
+
+// input int ... this path is used for enums as well
+VOption *
+VOption::set( const char *name, int value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = true;
+	g_value_init( &pair->value, G_TYPE_INT );
+	g_value_set_int( &pair->value, value );
+	options.push_back( pair );
+
+	return( this );
+}
+
+// input double 
+VOption *
+VOption::set( const char *name, double value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = true;
+	g_value_init( &pair->value, G_TYPE_DOUBLE );
+	g_value_set_double( &pair->value, value );
+	options.push_back( pair );
+
+	return( this );
+}
+
+VOption *
+VOption::set( const char *name, const char *value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = true;
+	g_value_init( &pair->value, G_TYPE_STRING );
+	g_value_set_string( &pair->value, value );
+	options.push_back( pair );
+
+	return( this );
+}
+
+// input image
+VOption *
+VOption::set( const char *name, VImage value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = true;
+	g_value_init( &pair->value, VIPS_TYPE_IMAGE );
+	g_value_set_object( &pair->value, value.get_image() );
+	options.push_back( pair );
+
+	return( this );
+}
+
+// input double array
+VOption *
+VOption::set( const char *name, std::vector<double> value )
+{
+	Pair *pair = new Pair( name );
+
+	double *array;
+	unsigned int i; 
+
+	pair->input = true;
+
+	g_value_init( &pair->value, VIPS_TYPE_ARRAY_DOUBLE );
+	vips_value_set_array_double( &pair->value, NULL,
+		static_cast< int >( value.size() ) );
+	array = vips_value_get_array_double( &pair->value, NULL ); 
+
+	for( i = 0; i < value.size(); i++ )  
+		array[i] = value[i]; 
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// input image array
+VOption *
+VOption::set( const char *name, std::vector<VImage> value )
+{
+	Pair *pair = new Pair( name );
+
+	VipsImage **array;
+	unsigned int i; 
+
+	pair->input = true;
+
+	g_value_init( &pair->value, VIPS_TYPE_ARRAY_IMAGE );
+	vips_value_set_array_image( &pair->value,
+		static_cast< int >( value.size() ) );
+	array = vips_value_get_array_image( &pair->value, NULL );
+
+	for( i = 0; i < value.size(); i++ ) { 
+		VipsImage *vips_image = value[i].get_image();
+
+		array[i] = vips_image; 
+		g_object_ref( vips_image );  
+	}
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// input blob
+VOption *
+VOption::set( const char *name, VipsBlob *value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = true;
+	g_value_init( &pair->value, VIPS_TYPE_BLOB );
+	g_value_set_boxed( &pair->value, value );
+	options.push_back( pair );
+
+	return( this );
+}
+
+// output bool
+VOption *
+VOption::set( const char *name, bool *value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = false;
+	pair->vbool = value;
+	g_value_init( &pair->value, G_TYPE_BOOLEAN ); 
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// output int
+VOption *
+VOption::set( const char *name, int *value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = false;
+	pair->vint = value;
+	g_value_init( &pair->value, G_TYPE_INT ); 
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// output double
+VOption *
+VOption::set( const char *name, double *value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = false;
+	pair->vdouble = value;
+	g_value_init( &pair->value, G_TYPE_DOUBLE ); 
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// output image
+VOption *
+VOption::set( const char *name, VImage *value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = false;
+	pair->vimage = value;
+	g_value_init( &pair->value, VIPS_TYPE_IMAGE );
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// output doublearray
+VOption *
+VOption::set( const char *name, std::vector<double> *value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = false;
+	pair->vvector = value;
+	g_value_init( &pair->value, VIPS_TYPE_ARRAY_DOUBLE ); 
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// output blob
+VOption *
+VOption::set( const char *name, VipsBlob **value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = false;
+	pair->vblob = value;
+	g_value_init( &pair->value, VIPS_TYPE_BLOB ); 
+
+	options.push_back( pair );
+
+	return( this );
+}
+
+// just g_object_set_property(), except we allow set enum from string
+static void 
+set_property( VipsObject *object, const char *name, const GValue *value )
+{
+	VipsObjectClass *object_class = VIPS_OBJECT_GET_CLASS( object );
+	GType type = G_VALUE_TYPE( value );
+
+	GParamSpec *pspec;
+	VipsArgumentClass *argument_class;
+	VipsArgumentInstance *argument_instance;
+
+	if( vips_object_get_argument( object, name, 
+		&pspec, &argument_class, &argument_instance ) ) {
+		vips_warn( NULL, "%s", vips_error_buffer() );
+		vips_error_clear();
+		return;
+	}
+
+	if( G_IS_PARAM_SPEC_ENUM( pspec ) &&
+		type == G_TYPE_STRING ) {
+		GType pspec_type = G_PARAM_SPEC_VALUE_TYPE( pspec );
+
+		int enum_value;
+		GValue value2 = { 0 }; 
+
+		if( (enum_value = vips_enum_from_nick( object_class->nickname, 
+			pspec_type, g_value_get_string( value ) )) < 0 ) {
+			vips_warn( NULL, "%s", vips_error_buffer() );
+			vips_error_clear();
+			return;
+		}
+
+		g_value_init( &value2, pspec_type ); 
+		g_value_set_enum( &value2, enum_value ); 
+		g_object_set_property( G_OBJECT( object ), name, &value2 );
+		g_value_unset( &value2 );
+	}
+	else
+		g_object_set_property( G_OBJECT( object ), name, value );
+}
+
+// walk the options and set props on the operation 
+void 
+VOption::set_operation( VipsOperation *operation )
+{
+	std::list<Pair *>::iterator i;
+
+	for( i = options.begin(); i != options.end(); ++i ) 
+		if( (*i)->input ) {
+#ifdef VIPS_DEBUG_VERBOSE
+			printf( "set_operation: " );
+			vips_object_print_name( VIPS_OBJECT( operation ) );
+			char *str_value = g_strdup_value_contents( &(*i)->value );
+			printf( ".%s = %s\n", (*i)->name, str_value );
+			g_free( str_value );
+#endif /*VIPS_DEBUG_VERBOSE*/
+
+			set_property( VIPS_OBJECT( operation ),
+				(*i)->name, &(*i)->value );
+		}
+}
+
+// walk the options and fetch any requested outputs
+void 
+VOption::get_operation( VipsOperation *operation )
+{
+	std::list<Pair *>::iterator i;
+
+	for( i = options.begin(); i != options.end(); ++i ) 
+		if( ! (*i)->input ) {
+			const char *name = (*i)->name;
+
+			g_object_get_property( G_OBJECT( operation ),
+				name, &(*i)->value );
+
+#ifdef VIPS_DEBUG_VERBOSE
+			printf( "get_operation: " );
+			vips_object_print_name( VIPS_OBJECT( operation ) );
+			char *str_value = g_strdup_value_contents( 
+				&(*i)->value );
+			printf( ".%s = %s\n", name, str_value );
+			g_free( str_value );
+#endif /*VIPS_DEBUG_VERBOSE*/
+
+			GValue *value = &(*i)->value;
+			GType type = G_VALUE_TYPE( value );
+
+			if( type == VIPS_TYPE_IMAGE ) {
+				// rebox object
+				VipsImage *image = VIPS_IMAGE( 
+					g_value_get_object( value ) );  
+				*((*i)->vimage) = VImage( image ); 
+			}
+			else if( type == G_TYPE_INT ) 
+				*((*i)->vint) = g_value_get_int( value ); 
+			else if( type == G_TYPE_BOOLEAN ) 
+				*((*i)->vbool) = g_value_get_boolean( value ); 
+			else if( type == G_TYPE_DOUBLE ) 
+				*((*i)->vdouble) = g_value_get_double( value ); 
+			else if( type == VIPS_TYPE_ARRAY_DOUBLE ) {
+				int length;
+				double *array = 
+					vips_value_get_array_double( value, 
+					&length );
+				int j;
+
+				((*i)->vvector)->resize( length ); 
+				for( j = 0; j < length; j++ )
+					(*((*i)->vvector))[j] = array[j];
+			}
+			else if( type == VIPS_TYPE_BLOB ) {
+				// our caller gets a reference
+				*((*i)->vblob) = 
+					(VipsBlob *) g_value_dup_boxed( value );
+			}
+		}
+}
+
+void 
+VImage::call_option_string( const char *operation_name, 
+	const char *option_string, VOption *options ) 
+{
+	VipsOperation *operation;
+
+	VIPS_DEBUG_MSG( "vips_call_by_name: starting for %s ...\n", 
+		operation_name );
+
+	if( !(operation = vips_operation_new( operation_name )) ) {
+		if( options )
+			delete options;
+		throw( VError() ); 
+	}
+
+	/* Set str options before vargs options, so the user can't 
+	 * override things we set deliberately.
+	 */
+	if( option_string &&
+		vips_object_set_from_string( VIPS_OBJECT( operation ), 
+			option_string ) ) {
+		vips_object_unref_outputs( VIPS_OBJECT( operation ) );
+		g_object_unref( operation ); 
+		delete options; 
+		throw( VError() ); 
+	}
+
+	if( options )
+		options->set_operation( operation );
+
+	/* Build from cache.
+	 */
+	if( vips_cache_operation_buildp( &operation ) ) {
+		vips_object_unref_outputs( VIPS_OBJECT( operation ) );
+		delete options; 
+		throw( VError() ); 
+	}
+
+	/* Walk args again, writing output.
+	 */
+	if( options )
+		options->get_operation( operation );
+
+	/* We're done with options!
+	 */
+	delete options; 
+
+	/* The operation we have built should now have been reffed by 
+	 * one of its arguments or have finished its work. Either 
+	 * way, we can unref.
+	 */
+	g_object_unref( operation );
+}
+
+void 
+VImage::call( const char *operation_name, VOption *options ) 
+{
+	call_option_string( operation_name, NULL, options ); 
+}
+
+VImage 
+VImage::new_from_file( const char *name, VOption *options )
+{
+	char filename[VIPS_PATH_MAX];
+	char option_string[VIPS_PATH_MAX];
+	const char *operation_name;
+
+	VImage out; 
+
+	vips__filename_split8( name, filename, option_string );
+	if( !(operation_name = vips_foreign_find_load( filename )) ) {
+		delete options; 
+		throw VError(); 
+	}
+
+	call_option_string( operation_name, option_string,
+		(options ? options : VImage::option())-> 
+			set( "filename", filename )->
+			set( "out", &out ) );
+
+	return( out ); 
+}
+
+VImage 
+VImage::new_from_buffer( void *buf, size_t len, const char *option_string, 
+	VOption *options )
+{
+	const char *operation_name;
+	VipsBlob *blob;
+	VImage out;
+
+	if( !(operation_name = vips_foreign_find_load_buffer( buf, len )) ) {
+		delete options; 
+		throw( VError() ); 
+	}
+
+	/* We don't take a copy of the data or free it.
+	 */
+	blob = vips_blob_new( NULL, buf, len );
+	options = (options ? options : VImage::option())-> 
+		set( "buffer", blob )->
+		set( "out", &out );
+	vips_area_unref( VIPS_AREA( blob ) );
+
+	call_option_string( operation_name, option_string, options ); 
+
+	return( out );
+}
+
+VImage 
+VImage::new_from_image( std::vector<double> pixel )
+{
+	VImage onepx = VImage::black( 1, 1, 
+		VImage::option()->set( "bands", bands() ) ); 
+
+	onepx = onepx.linear( to_vectorv( 1, 1.0 ), pixel ).cast( format() );
+
+	VImage big = onepx.embed( 0, 0, width(), height(), 
+		VImage::option()->set( "extend", VIPS_EXTEND_COPY ) ); 
+
+	big = big.copy( 
+		VImage::option()->
+			set( "interpretation", interpretation() )->
+			set( "xres", xres() )->
+			set( "yres", yres() )->
+			set( "xoffset", xres() )->
+			set( "yoffset", yres() ) ); 
+
+	return( big ); 
+}
+
+VImage 
+VImage::new_from_image( double pixel )
+{
+	return( new_from_image( to_vectorv( 1, pixel ) ) ); 
+}
+
+VImage 
+VImage::new_matrix( int width, int height ) 
+{
+	return( VImage( vips_image_new_matrix( width, height ) ) ); 
+}
+
+VImage 
+VImage::new_matrixv( int width, int height, ... )
+{
+	VImage matrix = new_matrix( width, height );
+	VipsImage *vips_matrix = matrix.get_image(); 
+
+	va_list ap;
+
+	va_start( ap, height );
+	for( int y = 0; y < height; y++ )
+		for( int x = 0; x < width; x++ )
+			*VIPS_MATRIX( vips_matrix, x, y ) = 
+				va_arg( ap, double );
+	va_end( ap );
+
+	return( matrix ); 
+}
+
+void 
+VImage::write_to_file( const char *name, VOption *options )
+{
+	char filename[VIPS_PATH_MAX];
+	char option_string[VIPS_PATH_MAX];
+	const char *operation_name;
+
+	vips__filename_split8( name, filename, option_string );
+	if( !(operation_name = vips_foreign_find_save( filename )) ) {
+		delete options; 
+		throw VError(); 
+	}
+
+	call_option_string( operation_name, option_string, 
+		(options ? options : VImage::option())-> 
+			set( "in", *this )->
+			set( "filename", filename ) );
+}
+
+void 
+VImage::write_to_buffer( const char *suffix, void **buf, size_t *size, 
+	VOption *options )
+{
+	char filename[VIPS_PATH_MAX];
+	char option_string[VIPS_PATH_MAX];
+	const char *operation_name;
+	VipsBlob *blob;
+
+	vips__filename_split8( suffix, filename, option_string );
+	if( !(operation_name = vips_foreign_find_save_buffer( filename )) ) {
+		delete options; 
+		throw VError(); 
+	}
+
+	call_option_string( operation_name, option_string, 
+		(options ? options : VImage::option())-> 
+			set( "in", *this )->
+			set( "buffer", &blob ) );
+
+	if( blob ) { 
+		if( buf ) {
+			*buf = VIPS_AREA( blob )->data;
+			VIPS_AREA( blob )->free_fn = NULL;
+		}
+		if( size )
+			*size = VIPS_AREA( blob )->length;
+
+		vips_area_unref( VIPS_AREA( blob ) );
+	}
+}
+
+#include "vips-operators.cpp"
+
+std::vector<VImage> 
+VImage::bandsplit( VOption *options )
+{
+	std::vector<VImage> b; 
+
+	for( int i = 0; i < bands(); i++ )
+		b.push_back( extract_band( i ) ); 
+
+	return( b ); 
+}
+
+VImage 
+VImage::bandjoin( VImage other, VOption *options )
+{
+    VImage v[2] = { *this, other }; 
+    std::vector<VImage> vec( v, v + VIPS_NUMBER( v ) );
+
+    return( bandjoin( vec, options ) ); 
+}
+
+std::complex<double> 
+VImage::minpos( VOption *options )
+{
+	double x, y;
+
+	(void) min( 
+		(options ? options : VImage::option()) ->
+			set( "x", &x ) ->
+			set( "y", &y ) );
+
+	return( std::complex<double>( x, y ) ); 
+}
+
+std::complex<double> 
+VImage::maxpos( VOption *options )
+{
+	double x, y;
+
+	(void) max( 
+		(options ? options : VImage::option()) ->
+			set( "x", &x ) ->
+			set( "y", &y ) );
+
+	return( std::complex<double>( x, y ) ); 
+}
+
+VIPS_NAMESPACE_END

src/libvips/cplusplus/VInterpolate.cpp

@@ -0,0 +1,76 @@
+/* Object part of VInterpolate class
+ */
+
+/*
+
+    Copyright (C) 1991-2001 The National Gallery
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301  USA
+
+ */
+
+/*
+
+    These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
+
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /*HAVE_CONFIG_H*/
+#include <vips/intl.h>
+
+#include <vips/vips8>
+
+#include <vips/debug.h>
+
+/*
+#define VIPS_DEBUG
+#define VIPS_DEBUG_VERBOSE
+ */
+
+VIPS_NAMESPACE_START
+
+VInterpolate 
+VInterpolate::new_from_name( const char *name, VOption *options )
+{
+	VipsInterpolate *interp;
+
+	if( !(interp = vips_interpolate_new( name )) ) {
+		delete options; 
+		throw VError(); 
+	}
+	delete options; 
+
+	VInterpolate out( interp ); 
+
+	return( out ); 
+}
+
+VOption *
+VOption::set( const char *name, VInterpolate value )
+{
+	Pair *pair = new Pair( name );
+
+	pair->input = true;
+	g_value_init( &pair->value, VIPS_TYPE_INTERPOLATE );
+	g_value_set_object( &pair->value, value.get_interpolate() );
+	options.push_back( pair );
+
+	return( this );
+}
+
+VIPS_NAMESPACE_END

src/metadata.cc

@@ -0,0 +1,224 @@
+#include <node.h>
+#include <vips/vips8>
+
+#include "nan.h"
+
+#include "common.h"
+#include "metadata.h"
+
+using v8::Handle;
+using v8::Local;
+using v8::Value;
+using v8::Object;
+using v8::Number;
+using v8::String;
+using v8::Boolean;
+using v8::Function;
+using v8::Exception;
+
+using Nan::AsyncQueueWorker;
+using Nan::AsyncWorker;
+using Nan::Callback;
+using Nan::HandleScope;
+using Nan::Utf8String;
+using Nan::Has;
+using Nan::Get;
+using Nan::Set;
+using Nan::New;
+using Nan::NewBuffer;
+using Nan::Null;
+using Nan::Error;
+
+using vips::VImage;
+using vips::VError;
+
+using sharp::ImageType;
+using sharp::ImageTypeId;
+using sharp::DetermineImageType;
+using sharp::HasProfile;
+using sharp::HasAlpha;
+using sharp::ExifOrientation;
+using sharp::FreeCallback;
+using sharp::counterQueue;
+
+struct MetadataBaton {
+  // Input
+  std::string fileIn;
+  char *bufferIn;
+  size_t bufferInLength;
+  // Output
+  std::string format;
+  int width;
+  int height;
+  std::string space;
+  int channels;
+  bool hasProfile;
+  bool hasAlpha;
+  int orientation;
+  char *exif;
+  size_t exifLength;
+  char *icc;
+  size_t iccLength;
+  std::string err;
+
+  MetadataBaton():
+    bufferInLength(0),
+    orientation(0),
+    exifLength(0),
+    iccLength(0) {}
+};
+
+class MetadataWorker : public AsyncWorker {
+
+ public:
+  MetadataWorker(Callback *callback, MetadataBaton *baton, const Local<Object> &bufferIn) :
+    AsyncWorker(callback), baton(baton) {
+      if (baton->bufferInLength > 0) {
+        SaveToPersistent("bufferIn", bufferIn);
+      }
+    }
+  ~MetadataWorker() {}
+
+  void Execute() {
+    // Decrement queued task counter
+    g_atomic_int_dec_and_test(&counterQueue);
+
+    ImageType imageType = ImageType::UNKNOWN;
+    VImage image;
+    if (baton->bufferInLength > 0) {
+      // From buffer
+      imageType = DetermineImageType(baton->bufferIn, baton->bufferInLength);
+      if (imageType != ImageType::UNKNOWN) {
+        try {
+          image = VImage::new_from_buffer(baton->bufferIn, baton->bufferInLength, nullptr);
+        } catch (...) {
+          (baton->err).append("Input buffer has corrupt header");
+          imageType = ImageType::UNKNOWN;
+        }
+      } else {
+        (baton->err).append("Input buffer contains unsupported image format");
+      }
+    } else {
+      // From file
+      imageType = DetermineImageType(baton->fileIn.data());
+      if (imageType != ImageType::UNKNOWN) {
+        try {
+          image = VImage::new_from_file(baton->fileIn.data());
+        } catch (...) {
+          (baton->err).append("Input file has corrupt header");
+          imageType = ImageType::UNKNOWN;
+        }
+      } else {
+        (baton->err).append("Input file is missing or of an unsupported image format");
+      }
+    }
+    if (imageType != ImageType::UNKNOWN) {
+      // Image type
+      baton->format = ImageTypeId(imageType);
+      // VipsImage attributes
+      baton->width = image.width();
+      baton->height = image.height();
+      baton->space = vips_enum_nick(VIPS_TYPE_INTERPRETATION, image.interpretation());
+      baton->channels = image.bands();
+      baton->hasProfile = HasProfile(image);
+      // Derived attributes
+      baton->hasAlpha = HasAlpha(image);
+      baton->orientation = ExifOrientation(image);
+      // EXIF
+      if (image.get_typeof(VIPS_META_EXIF_NAME) == VIPS_TYPE_BLOB) {
+        size_t exifLength;
+        void const *exif = image.get_blob(VIPS_META_EXIF_NAME, &exifLength);
+        baton->exif = static_cast<char*>(g_malloc(exifLength));
+        memcpy(baton->exif, exif, exifLength);
+        baton->exifLength = exifLength;
+      }
+      // ICC profile
+      if (image.get_typeof(VIPS_META_ICC_NAME) == VIPS_TYPE_BLOB) {
+        size_t iccLength;
+        void const *icc = image.get_blob(VIPS_META_ICC_NAME, &iccLength);
+        baton->icc = static_cast<char*>(g_malloc(iccLength));
+        memcpy(baton->icc, icc, iccLength);
+        baton->iccLength = iccLength;
+      }
+    }
+    // Clean up
+    vips_error_clear();
+    vips_thread_shutdown();
+  }
+
+  void HandleOKCallback () {
+    HandleScope();
+
+    Local<Value> argv[2] = { Null(), Null() };
+    if (!baton->err.empty()) {
+      // Error
+      argv[0] = Error(baton->err.data());
+    } else {
+      // Metadata Object
+      Local<Object> info = New<Object>();
+      Set(info, New("format").ToLocalChecked(), New<String>(baton->format).ToLocalChecked());
+      Set(info, New("width").ToLocalChecked(), New<Number>(baton->width));
+      Set(info, New("height").ToLocalChecked(), New<Number>(baton->height));
+      Set(info, New("space").ToLocalChecked(), New<String>(baton->space).ToLocalChecked());
+      Set(info, New("channels").ToLocalChecked(), New<Number>(baton->channels));
+      Set(info, New("hasProfile").ToLocalChecked(), New<Boolean>(baton->hasProfile));
+      Set(info, New("hasAlpha").ToLocalChecked(), New<Boolean>(baton->hasAlpha));
+      if (baton->orientation > 0) {
+        Set(info, New("orientation").ToLocalChecked(), New<Number>(baton->orientation));
+      }
+      if (baton->exifLength > 0) {
+        Set(info,
+          New("exif").ToLocalChecked(),
+          NewBuffer(baton->exif, baton->exifLength, FreeCallback, nullptr).ToLocalChecked()
+        );
+      }
+      if (baton->iccLength > 0) {
+        Set(info,
+          New("icc").ToLocalChecked(),
+          NewBuffer(baton->icc, baton->iccLength, FreeCallback, nullptr).ToLocalChecked()
+        );
+      }
+      argv[1] = info;
+    }
+
+    // Dispose of Persistent wrapper around input Buffer so it can be garbage collected
+    if (baton->bufferInLength > 0) {
+      GetFromPersistent("bufferIn");
+    }
+    delete baton;
+
+    // Return to JavaScript
+    callback->Call(2, argv);
+  }
+
+ private:
+  MetadataBaton* baton;
+};
+
+/*
+  metadata(options, callback)
+*/
+NAN_METHOD(metadata) {
+  HandleScope();
+
+  // V8 objects are converted to non-V8 types held in the baton struct
+  MetadataBaton *baton = new MetadataBaton;
+  Local<Object> options = info[0].As<Object>();
+
+  // Input filename
+  baton->fileIn = *Utf8String(Get(options, New("fileIn").ToLocalChecked()).ToLocalChecked());
+  // Input Buffer object
+  Local<Object> bufferIn;
+  if (node::Buffer::HasInstance(Get(options, New("bufferIn").ToLocalChecked()).ToLocalChecked())) {
+    bufferIn = Get(options, New("bufferIn").ToLocalChecked()).ToLocalChecked().As<Object>();
+    baton->bufferInLength = node::Buffer::Length(bufferIn);
+    baton->bufferIn = node::Buffer::Data(bufferIn);
+  }
+
+  // Join queue for worker thread
+  Callback *callback = new Callback(info[1].As<Function>());
+  AsyncQueueWorker(new MetadataWorker(callback, baton, bufferIn));
+
+  // Increment queued task counter
+  g_atomic_int_inc(&counterQueue);
+}

src/metadata.h

@@ -0,0 +1,8 @@
+#ifndef SRC_METADATA_H_
+#define SRC_METADATA_H_
+
+#include "nan.h"
+
+NAN_METHOD(metadata);
+
+#endif  // SRC_METADATA_H_

src/operations.cc

@@ -0,0 +1,157 @@
+#include <vips/vips8>
+
+#include "common.h"
+#include "operations.h"
+
+using vips::VImage;
+
+namespace sharp {
+
+  /*
+    Alpha composite src over dst
+    Assumes alpha channels are already premultiplied and will be unpremultiplied after
+   */
+  VImage Composite(VImage src, VImage dst) {
+    using sharp::HasAlpha;
+
+    // Split src into non-alpha and alpha
+    VImage srcWithoutAlpha = src.extract_band(0, VImage::option()->set("n", src.bands() - 1));
+    VImage srcAlpha = src[src.bands() - 1] * (1.0 / 255.0);
+
+    // Split dst into non-alpha and alpha channels
+    VImage dstWithoutAlpha;
+    VImage dstAlpha;
+    if (HasAlpha(dst)) {
+      // Non-alpha: extract all-but-last channel
+      dstWithoutAlpha = dst.extract_band(0, VImage::option()->set("n", dst.bands() - 1));
+      // Alpha: Extract last channel
+      dstAlpha = dst[dst.bands() - 1] * (1.0 / 255.0);
+    } else {
+      // Non-alpha: Copy reference
+      dstWithoutAlpha = dst;
+      // Alpha: Use blank, opaque (0xFF) image
+      dstAlpha = VImage::black(dst.width(), dst.height()).invert();
+    }
+
+    //
+    // Compute normalized output alpha channel:
+    //
+    // References:
+    // - http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
+    // - https://github.com/jcupitt/ruby-vips/issues/28#issuecomment-9014826
+    //
+    // out_a = src_a + dst_a * (1 - src_a)
+    //                         ^^^^^^^^^^^
+    //                            t0
+    VImage t0 = srcAlpha.linear(-1.0, 1.0);
+    VImage outAlphaNormalized = srcAlpha + dstAlpha * t0;
+
+    //
+    // Compute output RGB channels:
+    //
+    // Wikipedia:
+    // out_rgb = (src_rgb * src_a + dst_rgb * dst_a * (1 - src_a)) / out_a
+    //                                                ^^^^^^^^^^^
+    //                                                    t0
+    //
+    // Omit division by `out_a` since `Compose` is supposed to output a
+    // premultiplied RGBA image as reversal of premultiplication is handled
+    // externally.
+    //
+    VImage outRGBPremultiplied = srcWithoutAlpha + dstWithoutAlpha * t0;
+
+    // Combine RGB and alpha channel into output image:
+    return outRGBPremultiplied.bandjoin(outAlphaNormalized * 255.0);
+  }
+
+  /*
+   * Stretch luminance to cover full dynamic range.
+   */
+  VImage Normalize(VImage image) {
+    // Get original colourspace
+    VipsInterpretation typeBeforeNormalize = image.interpretation();
+    if (typeBeforeNormalize == VIPS_INTERPRETATION_RGB) {
+      typeBeforeNormalize = VIPS_INTERPRETATION_sRGB;
+    }
+    // Convert to LAB colourspace
+    VImage lab = image.colourspace(VIPS_INTERPRETATION_LAB);
+    // Extract luminance
+    VImage luminance = lab[0];
+    // Find luminance range
+    VImage stats = luminance.stats();
+    double min = stats(0, 0)[0];
+    double max = stats(1, 0)[0];
+    if (min != max) {
+      // Extract chroma
+      VImage chroma = lab.extract_band(1, VImage::option()->set("n", 2));
+      // Calculate multiplication factor and addition
+      double f = 100.0 / (max - min);
+      double a = -(min * f);
+      // Scale luminance, join to chroma, convert back to original colourspace
+      VImage normalized = luminance.linear(f, a).bandjoin(chroma).colourspace(typeBeforeNormalize);
+      // Attach original alpha channel, if any
+      if (HasAlpha(image)) {
+        // Extract original alpha channel
+        VImage alpha = image[image.bands() - 1];
+        // Join alpha channel to normalised image
+        return normalized.bandjoin(alpha);
+      } else {
+        return normalized;
+      }
+    }
+    return image;
+  }
+
+  /*
+   * Gamma encoding/decoding
+   */
+  VImage Gamma(VImage image, double const exponent) {
+    if (HasAlpha(image)) {
+      // Separate alpha channel
+      VImage imageWithoutAlpha = image.extract_band(0,
+        VImage::option()->set("n", image.bands() - 1));
+      VImage alpha = image[image.bands() - 1];
+      return imageWithoutAlpha.gamma(VImage::option()->set("exponent", exponent)).bandjoin(alpha);
+    } else {
+      return image.gamma(VImage::option()->set("exponent", exponent));
+    }
+  }
+
+  /*
+   * Gaussian blur (use sigma <0 for fast blur)
+   */
+  VImage Blur(VImage image, double const sigma) {
+    if (sigma < 0.0) {
+      // Fast, mild blur - averages neighbouring pixels
+      VImage blur = VImage::new_matrixv(3, 3,
+        1.0, 1.0, 1.0,
+        1.0, 1.0, 1.0,
+        1.0, 1.0, 1.0);
+      blur.set("scale", 9.0);
+      return image.conv(blur);
+    } else {
+      // Slower, accurate Gaussian blur
+      return image.gaussblur(sigma);
+    }
+  }
+
+  /*
+   * Sharpen flat and jagged areas. Use radius of -1 for fast sharpen.
+   */
+  VImage Sharpen(VImage image, int const radius, double const flat, double const jagged) {
+    if (radius == -1) {
+      // Fast, mild sharpen
+      VImage sharpen = VImage::new_matrixv(3, 3,
+        -1.0, -1.0, -1.0,
+        -1.0, 32.0, -1.0,
+        -1.0, -1.0, -1.0);
+      sharpen.set("scale", 24.0);
+      return image.conv(sharpen);
+    } else {
+      // Slow, accurate sharpen in LAB colour space, with control over flat vs jagged areas
+      return image.sharpen(
+        VImage::option()->set("radius", radius)->set("m1", flat)->set("m2", jagged)
+      );
+    }
+  }
+}  // namespace sharp

src/operations.h

@@ -0,0 +1,37 @@
+#ifndef SRC_OPERATIONS_H_
+#define SRC_OPERATIONS_H_
+
+#include <vips/vips8>
+
+using vips::VImage;
+
+namespace sharp {
+
+  /*
+    Composite images `src` and `dst` with premultiplied alpha channel and output
+    image with premultiplied alpha.
+   */
+  VImage Composite(VImage src, VImage dst);
+
+  /*
+   * Stretch luminance to cover full dynamic range.
+   */
+  VImage Normalize(VImage image);
+
+  /*
+   * Gamma encoding/decoding
+   */
+  VImage Gamma(VImage image, double const exponent);
+
+  /*
+   * Gaussian blur. Use sigma of -1 for fast blur.
+   */
+  VImage Blur(VImage image, double const sigma);
+
+  /*
+   * Sharpen flat and jagged areas. Use radius of -1 for fast sharpen.
+   */
+  VImage Sharpen(VImage image, int const radius, double const flat, double const jagged);
+}  // namespace sharp
+
+#endif  // SRC_OPERATIONS_H_

src/pipeline.h

@@ -0,0 +1,8 @@
+#ifndef SRC_PIPELINE_H_
+#define SRC_PIPELINE_H_
+
+#include "nan.h"
+
+NAN_METHOD(pipeline);
+
+#endif  // SRC_PIPELINE_H_

src/sharp.cc

@@ -1,777 +1,35 @@
 #include <node.h>
-#include <node_buffer.h>
-#include <math.h>
-#include <string>
-#include <string.h>
-#include <tuple>
-#include <vips/vips.h>
+#include <vips/vips8>
 
 #include "nan.h"
 
-using namespace v8;
-using namespace node;
+#include "common.h"
+#include "metadata.h"
+#include "pipeline.h"
+#include "utilities.h"
 
-struct resize_baton {
-  std::string file_in;
-  void* buffer_in;
-  size_t buffer_in_len;
-  std::string output;
-  void* buffer_out;
-  size_t buffer_out_len;
-  int width;
-  int height;
-  bool crop;
-  int gravity;
-  bool max;
-  VipsExtend extend;
-  bool sharpen;
-  std::string interpolator;
-  bool progressive;
-  bool without_enlargement;
-  VipsAccess access_method;
-  int quality;
-  int compressionLevel;
-  int angle;
-  std::string err;
+NAN_MODULE_INIT(init) {
+  vips_init("sharp");
 
-  resize_baton():
-    buffer_in_len(0),
-    buffer_out_len(0),
-    crop(false),
-    gravity(0),
-    max(false),
-    sharpen(false),
-    progressive(false),
-    without_enlargement(false) {}
-};
-
-typedef enum {
-  UNKNOWN,
-  JPEG,
-  PNG,
-  WEBP,
-  TIFF,
-  MAGICK
-} ImageType;
-
-unsigned char const MARKER_JPEG[] = {0xff, 0xd8};
-unsigned char const MARKER_PNG[] = {0x89, 0x50};
-unsigned char const MARKER_WEBP[] = {0x52, 0x49};
-
-// How many tasks are in the queue?
-volatile int counter_queue = 0;
-// How many tasks are being processed?
-volatile int counter_process = 0;
-
-static bool ends_with(std::string const &str, std::string const &end) {
-  return str.length() >= end.length() && 0 == str.compare(str.length() - end.length(), end.length(), end);
-}
-
-static bool is_jpeg(std::string const &str) {
-  return ends_with(str, ".jpg") || ends_with(str, ".jpeg") || ends_with(str, ".JPG") || ends_with(str, ".JPEG");
-}
-
-static bool is_png(std::string const &str) {
-  return ends_with(str, ".png") || ends_with(str, ".PNG");
-}
-
-static bool is_webp(std::string const &str) {
-  return ends_with(str, ".webp") || ends_with(str, ".WEBP");
-}
-
-static bool is_tiff(std::string const &str) {
-  return ends_with(str, ".tif") || ends_with(str, ".tiff") || ends_with(str, ".TIF") || ends_with(str, ".TIFF");
-}
-
-static void resize_error(resize_baton *baton, VipsImage *unref) {
-  (baton->err).append(vips_error_buffer());
-  vips_error_clear();
-  g_object_unref(unref);
-  vips_thread_shutdown();
-  return;
-}
-
-/*
-  Calculate the angle of rotation for the output image.
-  In order of priority:
-   1. Use explicitly requested angle (supports 90, 180, 270)
-   2. Use input image EXIF Orientation header (does not support mirroring)
-   3. Otherwise default to zero, i.e. no rotation
-*/
-static VipsAngle
-sharp_calc_rotation(int const angle, VipsImage const *input) {
-  VipsAngle rotate = VIPS_ANGLE_0;
-  if (angle == -1) {
-    const char *exif;
-    if (!vips_image_get_string(input, "exif-ifd0-Orientation", &exif)) {
-      if (exif[0] == 0x36) { // "6"
-        rotate = VIPS_ANGLE_90;
-      } else if (exif[0] == 0x33) { // "3"
-        rotate = VIPS_ANGLE_180;
-      } else if (exif[0] == 0x38) { // "8"
-        rotate = VIPS_ANGLE_270;
-      }
-    }
-  } else {
-    if (angle == 90) {
-      rotate = VIPS_ANGLE_90;
-    } else if (angle == 180) {
-      rotate = VIPS_ANGLE_180;
-    } else if (angle == 270) {
-      rotate = VIPS_ANGLE_270;
-    }
-  }
-  return rotate;
-}
-
-/*
-  Calculate the (left, top) coordinates of the output image
-  within the input image, applying the given gravity.
-*/
-static std::tuple<int, int>
-sharp_calc_crop(int const inWidth, int const inHeight, int const outWidth, int const outHeight, int const gravity) {
-  int left = 0;
-  int top = 0;
-  switch (gravity) {
-    case 1: // North
-      left = (inWidth - outWidth + 1) / 2;
-      break;
-    case 2: // East
-      left = inWidth - outWidth;
-      top = (inHeight - outHeight + 1) / 2;
-      break;
-    case 3: // South
-      left = (inWidth - outWidth + 1) / 2;
-      top = inHeight - outHeight;
-      break;
-    case 4: // West
-      top = (inHeight - outHeight + 1) / 2;
-      break;
-    default: // Centre
-      left = (inWidth - outWidth + 1) / 2;
-      top = (inHeight - outHeight + 1) / 2;
-  }
-  return std::make_tuple(left, top);
-}
-
-/*
-  Initialise a VipsImage from a buffer. Supports JPEG, PNG and WebP.
-  Returns the ImageType detected, if any.
-*/
-static ImageType
-sharp_init_image_from_buffer(VipsImage **image, void *buffer, size_t const length, VipsAccess const access) {
-  ImageType imageType = UNKNOWN;
-  if (memcmp(MARKER_JPEG, buffer, 2) == 0) {
-    if (!vips_jpegload_buffer(buffer, length, image, "access", access, NULL)) {
-      imageType = JPEG;
-    }
-  } else if(memcmp(MARKER_PNG, buffer, 2) == 0) {
-    if (!vips_pngload_buffer(buffer, length, image, "access", access, NULL)) {
-      imageType = PNG;
-    }
-  } else if(memcmp(MARKER_WEBP, buffer, 2) == 0) {
-    if (!vips_webpload_buffer(buffer, length, image, "access", access, NULL)) {
-      imageType = WEBP;
-    }
-  }
-  return imageType;
-}
-
-/*
-  Initialise a VipsImage from a file.
-  Returns the ImageType detected, if any.
-*/
-static ImageType
-sharp_init_image_from_file(VipsImage **image, char const *file, VipsAccess const access) {
-  ImageType imageType = UNKNOWN;
-  if (vips_foreign_is_a("jpegload", file)) {
-    if (!vips_jpegload(file, image, "access", access, NULL)) {
-      imageType = JPEG;
-    }
-  } else if (vips_foreign_is_a("pngload", file)) {
-    if (!vips_pngload(file, image, "access", access, NULL)) {
-      imageType = PNG;
-    }
-  } else if (vips_foreign_is_a("webpload", file)) {
-    if (!vips_webpload(file, image, "access", access, NULL)) {
-      imageType = WEBP;
-    }
-  } else if (vips_foreign_is_a("tiffload", file)) {
-    if (!vips_tiffload(file, image, "access", access, NULL)) {
-      imageType = TIFF;
-    }
-  } else if(vips_foreign_is_a("magickload", file)) {
-    if (!vips_magickload(file, image, "access", access, NULL)) {
-      imageType = MAGICK;
-    }
-  }
-  return imageType;
-}
-
-// Metadata
-
-struct metadata_baton {
-  // Input
-  std::string file_in;
-  void* buffer_in;
-  size_t buffer_in_len;
-  // Output
-  std::string format;
-  int width;
-  int height;
-  std::string space;
-  int channels;
-  int orientation;
-  std::string err;
-
-  metadata_baton():
-    buffer_in_len(0),
-    orientation(0) {}
-};
-
-class MetadataWorker : public NanAsyncWorker {
-
-  public:
-    MetadataWorker(NanCallback *callback, metadata_baton *baton) : NanAsyncWorker(callback), baton(baton) {}
-    ~MetadataWorker() {}
-
-  void Execute() {
-    // Decrement queued task counter
-    g_atomic_int_dec_and_test(&counter_queue);
-
-    ImageType imageType = UNKNOWN;
-    VipsImage *image = vips_image_new();
-    if (baton->buffer_in_len > 1) {
-      // From buffer
-      imageType = sharp_init_image_from_buffer(&image, baton->buffer_in, baton->buffer_in_len, VIPS_ACCESS_RANDOM);
-      if (imageType == UNKNOWN) {
-        (baton->err).append("Input buffer contains unsupported image format");
-      }
-    } else {
-      // From file
-      imageType = sharp_init_image_from_file(&image, baton->file_in.c_str(), VIPS_ACCESS_RANDOM);
-      if (imageType == UNKNOWN) {
-        (baton->err).append("File is of an unsupported image format");
-      }
-    }
-    if (imageType != UNKNOWN) {
-      // Image type
-      switch (imageType) {
-        case JPEG: baton->format = "jpeg"; break;
-        case PNG: baton->format = "png"; break;
-        case WEBP: baton->format = "webp"; break;
-        case TIFF: baton->format = "tiff"; break;
-        case MAGICK: baton->format = "magick"; break;
-        case UNKNOWN: default: baton->format = "";
-      }
-      // VipsImage attributes
-      baton->width = image->Xsize;
-      baton->height = image->Ysize;
-      baton->space = vips_enum_nick(VIPS_TYPE_INTERPRETATION, image->Type);
-      baton->channels = image->Bands;
-      // EXIF Orientation
-      const char *exif;
-      if (!vips_image_get_string(image, "exif-ifd0-Orientation", &exif)) {
-        baton->orientation = atoi(&exif[0]);
-      }
-    }
-    // Clean up
-    g_object_unref(image);
-    vips_error_clear();
-    vips_thread_shutdown();
-  }
-
-  void HandleOKCallback () {
-    NanScope();
-
-    Handle<Value> argv[2] = { NanNull(), NanNull() };
-    if (!baton->err.empty()) {
-      // Error
-      argv[0] = NanNew<String>(baton->err.data(), baton->err.size());
-    } else {
-      // Metadata Object
-      Local<Object> info = NanNew<Object>();
-      info->Set(NanNew<String>("format"), NanNew<String>(baton->format));
-      info->Set(NanNew<String>("width"), NanNew<Number>(baton->width));
-      info->Set(NanNew<String>("height"), NanNew<Number>(baton->height));
-      info->Set(NanNew<String>("space"), NanNew<String>(baton->space));
-      info->Set(NanNew<String>("channels"), NanNew<Number>(baton->channels));
-      if (baton->orientation > 0) {
-        info->Set(NanNew<String>("orientation"), NanNew<Number>(baton->orientation));
-      }
-      argv[1] = info;
-    }
-    delete baton;
-
-    // Return to JavaScript
-    callback->Call(2, argv);
-  }
-
-  private:
-    metadata_baton* baton;
-};
-
-/*
-  metadata(options, callback)
-*/
-NAN_METHOD(metadata) {
-  NanScope();
-
-  // V8 objects are converted to non-V8 types held in the baton struct
-  metadata_baton *baton = new metadata_baton;
-  Local<Object> options = args[0]->ToObject();
-
-  // Input filename
-  baton->file_in = *String::Utf8Value(options->Get(NanNew<String>("fileIn"))->ToString());
-  // Input Buffer object
-  if (options->Get(NanNew<String>("bufferIn"))->IsObject()) {
-    Local<Object> buffer = options->Get(NanNew<String>("bufferIn"))->ToObject();
-    baton->buffer_in_len = Buffer::Length(buffer);
-    baton->buffer_in = Buffer::Data(buffer);
-  }
-
-  // Join queue for worker thread
-  NanCallback *callback = new NanCallback(args[1].As<v8::Function>());
-  NanAsyncQueueWorker(new MetadataWorker(callback, baton));
-
-  // Increment queued task counter
-  g_atomic_int_inc(&counter_queue);
-
-  NanReturnUndefined();
-}
-
-// Resize
-
-class ResizeWorker : public NanAsyncWorker {
-  public:
-    ResizeWorker(NanCallback *callback, resize_baton *baton) : NanAsyncWorker(callback), baton(baton) {}
-    ~ResizeWorker() {}
-
-  void Execute() {
-    // Decrement queued task counter
-    g_atomic_int_dec_and_test(&counter_queue);
-    // Increment processing task counter
-    g_atomic_int_inc(&counter_process);
-
-    // Input
-    ImageType inputImageType = UNKNOWN;
-    VipsImage *in = vips_image_new();
-    if (baton->buffer_in_len > 1) {
-      // From buffer
-      inputImageType = sharp_init_image_from_buffer(&in, baton->buffer_in, baton->buffer_in_len, baton->access_method);
-      if (inputImageType == UNKNOWN) {
-        (baton->err).append("Input buffer contains unsupported image format");
-      }
-    } else {
-      // From file
-      inputImageType = sharp_init_image_from_file(&in, baton->file_in.c_str(), baton->access_method);
-      if (inputImageType == UNKNOWN) {
-        (baton->err).append("File is of an unsupported image format");
-      }
-    }
-    if (inputImageType == UNKNOWN) {
-      return resize_error(baton, in);
-    }
-
-    // Get input image width and height
-    int inputWidth = in->Xsize;
-    int inputHeight = in->Ysize;
-
-    // Calculate angle of rotation, to be carried out later
-    VipsAngle rotation = sharp_calc_rotation(baton->angle, in);
-    if (rotation == VIPS_ANGLE_90 || rotation == VIPS_ANGLE_270) {
-      // Swap input output width and height when rotating by 90 or 270 degrees
-      int swap = inputWidth;
-      inputWidth = inputHeight;
-      inputHeight = swap;
-    }
-
-    // Scaling calculations
-    double factor;
-    if (baton->width > 0 && baton->height > 0) {
-      // Fixed width and height
-      double xfactor = static_cast<double>(inputWidth) / static_cast<double>(baton->width);
-      double yfactor = static_cast<double>(inputHeight) / static_cast<double>(baton->height);
-      factor = baton->crop ? std::min(xfactor, yfactor) : std::max(xfactor, yfactor);
-      // if max is set, we need to compute the real size of the thumb image
-      if (baton->max) {
-        if (xfactor > yfactor) {
-          baton->height = round(static_cast<double>(inputHeight) / xfactor);
-        } else {
-          baton->width = round(static_cast<double>(inputWidth) / yfactor);
-        }
-      }
-    } else if (baton->width > 0) {
-      // Fixed width, auto height
-      factor = static_cast<double>(inputWidth) / static_cast<double>(baton->width);
-      baton->height = floor(static_cast<double>(inputHeight) / factor);
-    } else if (baton->height > 0) {
-      // Fixed height, auto width
-      factor = static_cast<double>(inputHeight) / static_cast<double>(baton->height);
-      baton->width = floor(static_cast<double>(inputWidth) / factor);
-    } else {
-      // Identity transform
-      factor = 1;
-      baton->width = inputWidth;
-      baton->height = inputHeight;
-    }
-    int shrink = floor(factor);
-    if (shrink < 1) {
-      shrink = 1;
-    }
-    double residual = static_cast<double>(shrink) / factor;
-
-    // Do not enlarge the output if the input width *or* height are already less than the required dimensions
-    if (baton->without_enlargement) {
-      if (inputWidth < baton->width || inputHeight < baton->height) {
-        factor = 1;
-        shrink = 1;
-        residual = 0;
-        baton->width = inputWidth;
-        baton->height = inputHeight;
-      }
-    }
-
-    // Try to use libjpeg shrink-on-load
-    int shrink_on_load = 1;
-    if (inputImageType == JPEG) {
-      if (shrink >= 8) {
-        factor = factor / 8;
-        shrink_on_load = 8;
-      } else if (shrink >= 4) {
-        factor = factor / 4;
-        shrink_on_load = 4;
-      } else if (shrink >= 2) {
-        factor = factor / 2;
-        shrink_on_load = 2;
-      }
-    }
-    VipsImage *shrunk_on_load = vips_image_new();
-    if (shrink_on_load > 1) {
-      // Recalculate integral shrink and double residual
-      factor = std::max(factor, 1.0);
-      shrink = floor(factor);
-      residual = static_cast<double>(shrink) / factor;
-      // Reload input using shrink-on-load
-      if (baton->buffer_in_len > 1) {
-        if (vips_jpegload_buffer(baton->buffer_in, baton->buffer_in_len, &shrunk_on_load, "shrink", shrink_on_load, NULL)) {
-          return resize_error(baton, in);
-        }
-      } else {
-        if (vips_jpegload((baton->file_in).c_str(), &shrunk_on_load, "shrink", shrink_on_load, NULL)) {
-          return resize_error(baton, in);
-        }
-      }
-    } else {
-      vips_copy(in, &shrunk_on_load, NULL);
-    }
-    g_object_unref(in);
-
-    VipsImage *shrunk = vips_image_new();
-    if (shrink > 1) {
-      // Use vips_shrink with the integral reduction
-      if (vips_shrink(shrunk_on_load, &shrunk, shrink, shrink, NULL)) {
-        return resize_error(baton, shrunk_on_load);
-      }
-      // Recalculate residual float based on dimensions of required vs shrunk images
-      double shrunkWidth = shrunk->Xsize;
-      double shrunkHeight = shrunk->Ysize;
-      if (rotation == VIPS_ANGLE_90 || rotation == VIPS_ANGLE_270) {
-        // Swap input output width and height when rotating by 90 or 270 degrees
-        int swap = shrunkWidth;
-        shrunkWidth = shrunkHeight;
-        shrunkHeight = swap;
-      }
-      double residualx = static_cast<double>(baton->width) / static_cast<double>(shrunkWidth);
-      double residualy = static_cast<double>(baton->height) / static_cast<double>(shrunkHeight);
-      if (baton->crop || baton->max) {
-        residual = std::max(residualx, residualy);
-      } else {
-        residual = std::min(residualx, residualy);
-      }
-    } else {
-      vips_copy(shrunk_on_load, &shrunk, NULL);
-    }
-    g_object_unref(shrunk_on_load);
-
-    // Use vips_affine with the remaining float part
-    VipsImage *affined = vips_image_new();
-    if (residual != 0) {
-      // Create interpolator - "bilinear" (default), "bicubic" or "nohalo"
-      VipsInterpolate *interpolator = vips_interpolate_new(baton->interpolator.c_str());
-      // Perform affine transformation
-      if (vips_affine(shrunk, &affined, residual, 0, 0, residual, "interpolate", interpolator, NULL)) {
-        g_object_unref(interpolator);
-        return resize_error(baton, shrunk);
-      }
-      g_object_unref(interpolator);
-    } else {
-      vips_copy(shrunk, &affined, NULL);
-    }
-    g_object_unref(shrunk);
-
-    // Rotate
-    VipsImage *rotated = vips_image_new();
-    if (rotation != VIPS_ANGLE_0) {
-      if (vips_rot(affined, &rotated, rotation, NULL)) {
-        return resize_error(baton, affined);
-      }
-    } else {
-      vips_copy(affined, &rotated, NULL);
-    }
-    g_object_unref(affined);
-
-    // Crop/embed
-    VipsImage *canvased = vips_image_new();
-    if (rotated->Xsize != baton->width || rotated->Ysize != baton->height) {
-      if (baton->crop || baton->max) {
-        // Crop/max
-        int left;
-        int top;
-        std::tie(left, top) = sharp_calc_crop(rotated->Xsize, rotated->Ysize, baton->width, baton->height, baton->gravity);
-        int width = std::min(rotated->Xsize, baton->width);
-        int height = std::min(rotated->Ysize, baton->height);
-        if (vips_extract_area(rotated, &canvased, left, top, width, height, NULL)) {
-          return resize_error(baton, rotated);
-        }
-      } else {
-        // Embed
-        int left = (baton->width - rotated->Xsize) / 2;
-        int top = (baton->height - rotated->Ysize) / 2;
-        if (vips_embed(rotated, &canvased, left, top, baton->width, baton->height, "extend", baton->extend, NULL)) {
-          return resize_error(baton, rotated);
-        }
-      }
-    } else {
-      vips_copy(rotated, &canvased, NULL);
-    }
-    g_object_unref(rotated);
-
-    // Mild sharpen
-    VipsImage *sharpened = vips_image_new();
-    if (baton->sharpen) {
-      VipsImage *sharpen = vips_image_new_matrixv(3, 3,
-        -1.0, -1.0, -1.0,
-        -1.0, 32.0, -1.0,
-        -1.0, -1.0, -1.0);
-      vips_image_set_double(sharpen, "scale", 24);
-      if (vips_conv(canvased, &sharpened, sharpen, NULL)) {
-        g_object_unref(sharpen);
-        return resize_error(baton, canvased);
-      }
-      g_object_unref(sharpen);
-    } else {
-      vips_copy(canvased, &sharpened, NULL);
-    }
-    g_object_unref(canvased);
-
-    // Always convert to sRGB colour space
-    VipsImage *colourspaced = vips_image_new();
-    vips_colourspace(sharpened, &colourspaced, VIPS_INTERPRETATION_sRGB, NULL);
-    g_object_unref(sharpened);
-
-    // Generate image tile cache when interlace output is required
-    VipsImage *cached = vips_image_new();
-    if (baton->progressive) {
-      if (vips_tilecache(colourspaced, &cached, "threaded", TRUE, "persistent", TRUE, "max_tiles", -1, NULL)) {
-        return resize_error(baton, colourspaced);
-      }
-    } else {
-      vips_copy(colourspaced, &cached, NULL);
-    }
-    g_object_unref(colourspaced);
-
-    // Output
-    VipsImage *output = cached;
-    if (baton->output == "__jpeg" || (baton->output == "__input" && inputImageType == JPEG)) {
-      // Write JPEG to buffer
-      if (vips_jpegsave_buffer(output, &baton->buffer_out, &baton->buffer_out_len, "strip", TRUE, "Q", baton->quality, "optimize_coding", TRUE, "interlace", baton->progressive, NULL)) {
-        return resize_error(baton, output);
-      }
-    } else if (baton->output == "__png" || (baton->output == "__input" && inputImageType == PNG)) {
-      // Write PNG to buffer
-      if (vips_pngsave_buffer(output, &baton->buffer_out, &baton->buffer_out_len, "strip", TRUE, "compression", baton->compressionLevel, "interlace", baton->progressive, NULL)) {
-        return resize_error(baton, output);
-      }
-    } else if (baton->output == "__webp" || (baton->output == "__input" && inputImageType == WEBP)) {
-      // Write WEBP to buffer
-      if (vips_webpsave_buffer(output, &baton->buffer_out, &baton->buffer_out_len, "strip", TRUE, "Q", baton->quality, NULL)) {
-        return resize_error(baton, output);
-      }
-    } else if (is_jpeg(baton->output))  {
-      // Write JPEG to file
-      if (vips_jpegsave(output, baton->output.c_str(), "strip", TRUE, "Q", baton->quality, "optimize_coding", TRUE, "interlace", baton->progressive, NULL)) {
-        return resize_error(baton, output);
-      }
-    } else if (is_png(baton->output)) {
-      // Write PNG to file
-      if (vips_pngsave(output, baton->output.c_str(), "strip", TRUE, "compression", baton->compressionLevel, "interlace", baton->progressive, NULL)) {
-        return resize_error(baton, output);
-      }
-    } else if (is_webp(baton->output)) {
-      // Write WEBP to file
-      if (vips_webpsave(output, baton->output.c_str(), "strip", TRUE, "Q", baton->quality, NULL)) {
-        return resize_error(baton, output);
-      }
-    } else if (is_tiff(baton->output)) {
-      // Write TIFF to file
-      if (vips_tiffsave(output, baton->output.c_str(), "strip", TRUE, "compression", VIPS_FOREIGN_TIFF_COMPRESSION_JPEG, "Q", baton->quality, NULL)) {
-        return resize_error(baton, output);
-      }
-    } else {
-      (baton->err).append("Unsupported output " + baton->output);
-    }
-    g_object_unref(output);
-
-    // Clean up libvips' per-request data and threads
-    vips_error_clear();
-    vips_thread_shutdown();
-  }
-
-  void HandleOKCallback () {
-    NanScope();
-
-    Handle<Value> argv[3] = { NanNull(), NanNull(),  NanNull() };
-    if (!baton->err.empty()) {
-      // Error
-      argv[0] = NanNew<String>(baton->err.data(), baton->err.size());
-    } else {
-      // Info Object
-      Local<Object> info = NanNew<Object>();
-      info->Set(NanNew<String>("width"), NanNew<Number>(baton->width));
-      info->Set(NanNew<String>("height"), NanNew<Number>(baton->height));
-
-      if (baton->buffer_out_len > 0) {
-        // Buffer
-        argv[1] = NanNewBufferHandle((char *)baton->buffer_out, baton->buffer_out_len);
-        g_free(baton->buffer_out);
-        argv[2] = info;
-      } else {
-        // File
-        argv[1] = info;
-      }
-    }
-    delete baton;
-
-    // Decrement processing task counter
-    g_atomic_int_dec_and_test(&counter_process);
-
-    // Return to JavaScript
-    callback->Call(3, argv);
-  }
-
- private:
-  resize_baton* baton;
-};
-
-/*
-  resize(options, output, callback)
-*/
-NAN_METHOD(resize) {
-  NanScope();
-
-  // V8 objects are converted to non-V8 types held in the baton struct
-  resize_baton *baton = new resize_baton;
-  Local<Object> options = args[0]->ToObject();
-
-  // Input filename
-  baton->file_in = *String::Utf8Value(options->Get(NanNew<String>("fileIn"))->ToString());
-  // Input Buffer object
-  if (options->Get(NanNew<String>("bufferIn"))->IsObject()) {
-    Local<Object> buffer = options->Get(NanNew<String>("bufferIn"))->ToObject();
-    baton->buffer_in_len = Buffer::Length(buffer);
-    baton->buffer_in = Buffer::Data(buffer);
-  }
-  // Output image dimensions
-  baton->width = options->Get(NanNew<String>("width"))->Int32Value();
-  baton->height = options->Get(NanNew<String>("height"))->Int32Value();
-  // Canvas options
-  Local<String> canvas = options->Get(NanNew<String>("canvas"))->ToString();
-  if (canvas->Equals(NanNew<String>("c"))) {
-    baton->crop = true;
-  } else if (canvas->Equals(NanNew<String>("w"))) {
-    baton->extend = VIPS_EXTEND_WHITE;
-  } else if (canvas->Equals(NanNew<String>("b"))) {
-    baton->extend = VIPS_EXTEND_BLACK;
-  } else if (canvas->Equals(NanNew<String>("m"))) {
-    baton->max = true;
-  }
-  // Other options
-  baton->gravity = options->Get(NanNew<String>("gravity"))->Int32Value();
-  baton->sharpen = options->Get(NanNew<String>("sharpen"))->BooleanValue();
-  baton->interpolator = *String::Utf8Value(options->Get(NanNew<String>("interpolator"))->ToString());
-  baton->progressive = options->Get(NanNew<String>("progressive"))->BooleanValue();
-  baton->without_enlargement = options->Get(NanNew<String>("withoutEnlargement"))->BooleanValue();
-  baton->access_method = options->Get(NanNew<String>("sequentialRead"))->BooleanValue() ? VIPS_ACCESS_SEQUENTIAL : VIPS_ACCESS_RANDOM;
-  baton->quality = options->Get(NanNew<String>("quality"))->Int32Value();
-  baton->compressionLevel = options->Get(NanNew<String>("compressionLevel"))->Int32Value();
-  baton->angle = options->Get(NanNew<String>("angle"))->Int32Value();
-  // Output filename or __format for Buffer
-  baton->output = *String::Utf8Value(options->Get(NanNew<String>("output"))->ToString());
-
-  // Join queue for worker thread
-  NanCallback *callback = new NanCallback(args[1].As<v8::Function>());
-  NanAsyncQueueWorker(new ResizeWorker(callback, baton));
-
-  // Increment queued task counter
-  g_atomic_int_inc(&counter_queue);
-
-  NanReturnUndefined();
-}
-
-/*
-  Get and set cache memory and item limits
-*/
-NAN_METHOD(cache) {
-  NanScope();
-
-  // Set cache memory limit
-  if (args[0]->IsInt32()) {
-    vips_cache_set_max_mem(args[0]->Int32Value() * 1048576);
-  }
-
-  // Set cache items limit
-  if (args[1]->IsInt32()) {
-    vips_cache_set_max(args[1]->Int32Value());
-  }
-
-  // Get cache statistics
-  Local<Object> cache = NanNew<Object>();
-  cache->Set(NanNew<String>("current"), NanNew<Number>(vips_tracked_get_mem() / 1048576));
-  cache->Set(NanNew<String>("high"), NanNew<Number>(vips_tracked_get_mem_highwater() / 1048576));
-  cache->Set(NanNew<String>("memory"), NanNew<Number>(vips_cache_get_max_mem() / 1048576));
-  cache->Set(NanNew<String>("items"), NanNew<Number>(vips_cache_get_max()));
-  NanReturnValue(cache);
-}
-
-/*
-  Get internal counters (queued tasks, processing tasks)
-*/
-NAN_METHOD(counters) {
-  NanScope();
-  Local<Object> counters = NanNew<Object>();
-  counters->Set(NanNew<String>("queue"), NanNew<Number>(counter_queue));
-  counters->Set(NanNew<String>("process"), NanNew<Number>(counter_process));
-  NanReturnValue(counters);
-}
-
-static void at_exit(void* arg) {
-  NanScope();
-  vips_shutdown();
-}
-
-extern "C" void init(Handle<Object> target) {
-  NanScope();
-  vips_init("");
-  AtExit(at_exit);
-  // Set libvips operation cache limits
-  vips_cache_set_max_mem(100 * 1048576); // 100 MB
-  vips_cache_set_max(500); // 500 operations
   // Methods available to JavaScript
-  NODE_SET_METHOD(target, "metadata", metadata);
-  NODE_SET_METHOD(target, "resize", resize);
-  NODE_SET_METHOD(target, "cache", cache);
-  NODE_SET_METHOD(target, "counters", counters);
+  Nan::Set(target, Nan::New("metadata").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(metadata)).ToLocalChecked());
+  Nan::Set(target, Nan::New("pipeline").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(pipeline)).ToLocalChecked());
+  Nan::Set(target, Nan::New("cache").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(cache)).ToLocalChecked());
+  Nan::Set(target, Nan::New("concurrency").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(concurrency)).ToLocalChecked());
+  Nan::Set(target, Nan::New("counters").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(counters)).ToLocalChecked());
+  Nan::Set(target, Nan::New("simd").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(simd)).ToLocalChecked());
+  Nan::Set(target, Nan::New("libvipsVersion").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(libvipsVersion)).ToLocalChecked());
+  Nan::Set(target, Nan::New("format").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(format)).ToLocalChecked());
+  Nan::Set(target, Nan::New("_maxColourDistance").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(_maxColourDistance)).ToLocalChecked());
 }
 
 NODE_MODULE(sharp, init)

src/utilities.cc

@@ -0,0 +1,257 @@
+#include <cmath>
+#include <node.h>
+#include <vips/vips8>
+#include <vips/vector.h>
+
+#include "nan.h"
+
+#include "common.h"
+#include "operations.h"
+#include "utilities.h"
+
+using v8::Boolean;
+using v8::Integer;
+using v8::Local;
+using v8::Number;
+using v8::Object;
+using v8::String;
+
+using Nan::HandleScope;
+using Nan::New;
+using Nan::Set;
+using Nan::ThrowError;
+using Nan::To;
+using Nan::Utf8String;
+
+/*
+  Get and set cache limits
+*/
+NAN_METHOD(cache) {
+  HandleScope();
+
+  // Set memory limit
+  if (info[0]->IsInt32()) {
+    vips_cache_set_max_mem(To<int32_t>(info[0]).FromJust() * 1048576);
+  }
+  // Set file limit
+  if (info[1]->IsInt32()) {
+    vips_cache_set_max_files(To<int32_t>(info[1]).FromJust());
+  }
+  // Set items limit
+  if (info[2]->IsInt32()) {
+    vips_cache_set_max(To<int32_t>(info[2]).FromJust());
+  }
+
+  // Get memory stats
+  Local<Object> memory = New<Object>();
+  Set(memory, New("current").ToLocalChecked(),
+    New<Integer>(static_cast<int>(round(vips_tracked_get_mem() / 1048576)))
+  );
+  Set(memory, New("high").ToLocalChecked(),
+    New<Integer>(static_cast<int>(round(vips_tracked_get_mem_highwater() / 1048576)))
+  );
+  Set(memory, New("max").ToLocalChecked(),
+    New<Integer>(static_cast<int>(round(vips_cache_get_max_mem() / 1048576)))
+  );
+  // Get file stats
+  Local<Object> files = New<Object>();
+  Set(files, New("current").ToLocalChecked(), New<Integer>(vips_tracked_get_files()));
+  Set(files, New("max").ToLocalChecked(), New<Integer>(vips_cache_get_max_files()));
+
+  // Get item stats
+  Local<Object> items = New<Object>();
+  Set(items, New("current").ToLocalChecked(), New<Integer>(vips_cache_get_size()));
+  Set(items, New("max").ToLocalChecked(), New<Integer>(vips_cache_get_max()));
+
+  Local<Object> cache = New<Object>();
+  Set(cache, New("memory").ToLocalChecked(), memory);
+  Set(cache, New("files").ToLocalChecked(), files);
+  Set(cache, New("items").ToLocalChecked(), items);
+  info.GetReturnValue().Set(cache);
+}
+
+/*
+  Get and set size of thread pool
+*/
+NAN_METHOD(concurrency) {
+  HandleScope();
+
+  // Set concurrency
+  if (info[0]->IsInt32()) {
+    vips_concurrency_set(To<int32_t>(info[0]).FromJust());
+  }
+  // Get concurrency
+  info.GetReturnValue().Set(New<Integer>(vips_concurrency_get()));
+}
+
+/*
+  Get internal counters (queued tasks, processing tasks)
+*/
+NAN_METHOD(counters) {
+  using sharp::counterProcess;
+  using sharp::counterQueue;
+
+  HandleScope();
+  Local<Object> counters = New<Object>();
+  Set(counters, New("queue").ToLocalChecked(), New<Integer>(counterQueue));
+  Set(counters, New("process").ToLocalChecked(), New<Integer>(counterProcess));
+  info.GetReturnValue().Set(counters);
+}
+
+/*
+  Get and set use of SIMD vector unit instructions
+*/
+NAN_METHOD(simd) {
+  HandleScope();
+
+  // Set state
+  if (info[0]->IsBoolean()) {
+    vips_vector_set_enabled(To<bool>(info[0]).FromJust());
+  }
+  // Get state
+  info.GetReturnValue().Set(New<Boolean>(vips_vector_isenabled()));
+}
+
+/*
+  Get libvips version
+*/
+NAN_METHOD(libvipsVersion) {
+  HandleScope();
+  char version[9];
+  g_snprintf(version, sizeof(version), "%d.%d.%d", vips_version(0), vips_version(1), vips_version(2));
+  info.GetReturnValue().Set(New(version).ToLocalChecked());
+}
+
+/*
+  Get available input/output file/buffer/stream formats
+*/
+NAN_METHOD(format) {
+  HandleScope();
+
+  // Attribute names
+  Local<String> attrId = New("id").ToLocalChecked();
+  Local<String> attrInput = New("input").ToLocalChecked();
+  Local<String> attrOutput = New("output").ToLocalChecked();
+  Local<String> attrFile = New("file").ToLocalChecked();
+  Local<String> attrBuffer = New("buffer").ToLocalChecked();
+  Local<String> attrStream = New("stream").ToLocalChecked();
+
+  // Which load/save operations are available for each compressed format?
+  Local<Object> format = New<Object>();
+  for (std::string f : {"jpeg", "png", "webp", "tiff", "magick", "openslide", "dz"}) {
+    // Input
+    Local<Boolean> hasInputFile =
+      New<Boolean>(vips_type_find("VipsOperation", (f + "load").c_str()));
+    Local<Boolean> hasInputBuffer =
+      New<Boolean>(vips_type_find("VipsOperation", (f + "load_buffer").c_str()));
+    Local<Object> input = New<Object>();
+    Set(input, attrFile, hasInputFile);
+    Set(input, attrBuffer, hasInputBuffer);
+    Set(input, attrStream, hasInputBuffer);
+    // Output
+    Local<Boolean> hasOutputFile =
+      New<Boolean>(vips_type_find("VipsOperation", (f + "save").c_str()));
+    Local<Boolean> hasOutputBuffer =
+      New<Boolean>(vips_type_find("VipsOperation", (f + "save_buffer").c_str()));
+    Local<Object> output = New<Object>();
+    Set(output, attrFile, hasOutputFile);
+    Set(output, attrBuffer, hasOutputBuffer);
+    Set(output, attrStream, hasOutputBuffer);
+    // Other attributes
+    Local<Object> container = New<Object>();
+    Local<String> formatId = New(f).ToLocalChecked();
+    Set(container, attrId, formatId);
+    Set(container, attrInput, input);
+    Set(container, attrOutput, output);
+    // Add to set of formats
+    Set(format, formatId, container);
+  }
+
+  // Raw, uncompressed data
+  Local<Object> raw = New<Object>();
+  Local<String> rawId = New("raw").ToLocalChecked();
+  Set(raw, attrId, rawId);
+  Set(format, rawId, raw);
+  Local<Boolean> supported = New<Boolean>(true);
+  Local<Boolean> unsupported = New<Boolean>(false);
+  Local<Object> rawInput = New<Object>();
+  Set(rawInput, attrFile, unsupported);
+  Set(rawInput, attrBuffer, supported);
+  Set(rawInput, attrStream, supported);
+  Set(raw, attrInput, rawInput);
+  Local<Object> rawOutput = New<Object>();
+  Set(rawOutput, attrFile, unsupported);
+  Set(rawOutput, attrBuffer, supported);
+  Set(rawOutput, attrStream, supported);
+  Set(raw, attrOutput, rawOutput);
+
+  info.GetReturnValue().Set(format);
+}
+
+/*
+  Synchronous, internal-only method used by some of the functional tests.
+  Calculates the maximum colour distance using the DE2000 algorithm
+  between two images of the same dimensions and number of channels.
+*/
+NAN_METHOD(_maxColourDistance) {
+  using vips::VImage;
+  using vips::VError;
+  using sharp::DetermineImageType;
+  using sharp::ImageType;
+  using sharp::HasAlpha;
+
+  HandleScope();
+
+  // Open input files
+  VImage image1;
+  ImageType imageType1 = DetermineImageType(*Utf8String(info[0]));
+  if (imageType1 != ImageType::UNKNOWN) {
+    try {
+      image1 = VImage::new_from_file(*Utf8String(info[0]));
+    } catch (...) {
+      return ThrowError("Input file 1 has corrupt header");
+    }
+  } else {
+    return ThrowError("Input file 1 is of an unsupported image format");
+  }
+  VImage image2;
+  ImageType imageType2 = DetermineImageType(*Utf8String(info[1]));
+  if (imageType2 != ImageType::UNKNOWN) {
+    try {
+      image2 = VImage::new_from_file(*Utf8String(info[1]));
+    } catch (...) {
+      return ThrowError("Input file 2 has corrupt header");
+    }
+  } else {
+    return ThrowError("Input file 2 is of an unsupported image format");
+  }
+  // Ensure same number of channels
+  if (image1.bands() != image2.bands()) {
+    return ThrowError("mismatchedBands");
+  }
+  // Ensure same dimensions
+  if (image1.width() != image2.width() || image1.height() != image2.height()) {
+    return ThrowError("mismatchedDimensions");
+  }
+
+  double maxColourDistance;
+  try {
+    // Premultiply and remove alpha
+    if (HasAlpha(image1)) {
+      image1 = image1.premultiply().extract_band(1, VImage::option()->set("n", image1.bands() - 1));
+    }
+    if (HasAlpha(image2)) {
+      image2 = image2.premultiply().extract_band(1, VImage::option()->set("n", image2.bands() - 1));
+    }
+    // Calculate colour distance
+    maxColourDistance = image1.dE00(image2).max();
+  } catch (VError err) {
+    return ThrowError(err.what());
+  }
+
+  // Clean up libvips' per-request data and threads
+  vips_error_clear();
+  vips_thread_shutdown();
+
+  info.GetReturnValue().Set(New<Number>(maxColourDistance));
+}

src/utilities.h

@@ -0,0 +1,14 @@
+#ifndef SRC_UTILITIES_H_
+#define SRC_UTILITIES_H_
+
+#include "nan.h"
+
+NAN_METHOD(cache);
+NAN_METHOD(concurrency);
+NAN_METHOD(counters);
+NAN_METHOD(simd);
+NAN_METHOD(libvipsVersion);
+NAN_METHOD(format);
+NAN_METHOD(_maxColourDistance);
+
+#endif  // SRC_UTILITIES_H_

test/bench/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "sharp-benchmark",
+  "version": "0.0.1",
+  "private": true,
+  "author": "Lovell Fuller <npm@lovell.info>",
+  "description": "Benchmark and performance tests for sharp",
+  "scripts": {
+    "test": "VIPS_WARNING=0 node perf && node random && node parallel"
+  },
+  "devDependencies": {
+    "async": "^1.5.2",
+    "benchmark": "^2.0.0",
+    "gm": "^1.21.0",
+    "imagemagick": "^0.1.3",
+    "imagemagick-native": "elad/node-imagemagick-native",
+    "jimp": "^0.2.20",
+    "lwip": "^0.0.8",
+    "semver": "^5.1.0"
+  },
+  "license": "Apache-2.0",
+  "engines": {
+    "node": ">=0.10"
+  }
+}

test/bench/parallel.js

@@ -0,0 +1,44 @@
+'use strict';
+
+process.env.UV_THREADPOOL_SIZE = 64;
+
+var assert = require('assert');
+var async = require('async');
+
+var sharp = require('../../index');
+var fixtures = require('../fixtures');
+
+var width = 720;
+var height = 480;
+
+sharp.concurrency(1);
+sharp.simd(true);
+
+var timer = setInterval(function() {
+  console.dir(sharp.counters());
+}, 100);
+
+async.mapSeries([1, 1, 2, 4, 8, 16, 32, 64], function(parallelism, next) {
+  var start = new Date().getTime();
+  async.times(parallelism,
+    function(id, callback) {
+      /*jslint unused: false */
+      sharp(fixtures.inputJpg).resize(width, height).toBuffer(function(err, buffer) {
+        buffer = null;
+        callback(err, new Date().getTime() - start);
+      });
+    },
+    function(err, ids) {
+      assert(!err);
+      assert(ids.length === parallelism);
+      var mean = ids.reduce(function(a, b) {
+        return a + b;
+      }) / ids.length;
+      console.log(parallelism + ' parallel calls: fastest=' + ids[0] + 'ms slowest=' + ids[ids.length - 1] + 'ms mean=' + mean + 'ms');
+      next();
+    }
+  );
+}, function() {
+  clearInterval(timer);
+  console.dir(sharp.counters());
+});

test/bench/random.js

@@ -0,0 +1,76 @@
+'use strict';
+
+var imagemagick = require('imagemagick');
+var gm = require('gm');
+var assert = require('assert');
+var Benchmark = require('benchmark');
+
+var sharp = require('../../index');
+var fixtures = require('../fixtures');
+
+sharp.simd(true);
+
+var min = 320;
+var max = 960;
+
+// Nearest equivalent to bilinear
+var magickFilter = 'Triangle';
+
+var randomDimension = function() {
+  return Math.ceil(Math.random() * (max - min) + min);
+};
+
+new Benchmark.Suite('random').add('imagemagick', {
+  defer: true,
+  fn: function(deferred) {
+    imagemagick.resize({
+      srcPath: fixtures.inputJpg,
+      dstPath: fixtures.outputJpg,
+      quality: 0.8,
+      width: randomDimension(),
+      height: randomDimension(),
+      format: 'jpg',
+      filter: magickFilter
+    }, function(err) {
+      if (err) {
+        throw err;
+      } else {
+        deferred.resolve();
+      }
+    });
+  }
+}).add('gm', {
+  defer: true,
+  fn: function(deferred) {
+    gm(fixtures.inputJpg)
+      .resize(randomDimension(), randomDimension())
+      .filter(magickFilter)
+      .quality(80)
+      .toBuffer(function (err, buffer) {
+        if (err) {
+          throw err;
+        } else {
+          assert.notStrictEqual(null, buffer);
+          deferred.resolve();
+        }
+      });
+  }
+}).add('sharp', {
+  defer: true,
+  fn: function(deferred) {
+    sharp(fixtures.inputJpg).resize(randomDimension(), randomDimension()).toBuffer(function(err, buffer) {
+      if (err) {
+        throw err;
+      } else {
+        assert.notStrictEqual(null, buffer);
+        deferred.resolve();
+      }
+    });
+  }
+}).on('cycle', function(event) {
+  console.log(String(event.target));
+}).on('complete', function() {
+  var winner = this.filter('fastest').map('name');
+  assert.strictEqual('sharp', String(winner), 'sharp was slower than ' + winner);
+  console.dir(sharp.cache());
+}).run();

test/fixtures/check.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+      <path d="M30,76q6-14,13-26q6-12,14-23q8-12,13-17q3-4,6-6q1-1,5-2q8-1,12-1q1,0,1,1q0,1-1,2q-13,11-27,33q-14,21-24,44q-4,9-5,11q-1,2-9,2q-5,0-6-1q-1-1-5-6q-5-8-12-15q-3-4-3-6q0-2,4-5q3-2,6-2q3,0,8,3q5,4,10,14z" fill="green" />
+</svg>