Release v0.20.4

Add test cases for more tint colours and input interpretations

.gitattributes

@@ -0,0 +1 @@
+src/libvips/* linguist-vendored

.gitignore

@@ -1,6 +1,6 @@
 build
 node_modules
-coverage
+/coverage
 test/bench/node_modules
 test/fixtures/output*
 test/leak/libvips.supp
@@ -8,9 +8,8 @@ test/saliency/report.json
 test/saliency/Image*
 test/saliency/[Uu]serData*
 !test/saliency/userData.js
-lib
-include
-packaging/libvips*
-packaging/*.log
-!packaging/build
+vendor
+.gitattributes
 .DS_Store
+.nyc_output
+package-lock.json

.jshintignore

@@ -1,4 +0,0 @@
-node_modules
-test/bench/node_modules
-test/saliency/humanae/node_modules
-coverage

.jshintrc

@@ -1,12 +0,0 @@
-{
-  "strict": true,
-  "node": true,
-  "maxparams": 4,
-  "maxcomplexity": 14,
-  "globals": {
-    "beforeEach": true,
-    "afterEach": true,
-    "describe": true,
-    "it": true
-  }
-}

.npmignore

@@ -2,15 +2,13 @@ build
 node_modules
 coverage
 .editorconfig
-.jshintignore
-.jshintrc
+.gitattributes
 .gitignore
 test
 .travis.yml
 appveyor.yml
-circle.yml
 mkdocs.yml
-lib
-include
-packaging
-preinstall.sh
+vendor
+.prebuildrc
+.nyc_output
+CONTRIBUTING.md

.prebuildrc

@@ -0,0 +1,4 @@
+{
+  "include-regex": "(sharp\\.node|libvips-cpp\\.dll)",
+  "strip": true
+}

.travis.yml

@@ -1,21 +1,34 @@
 language: node_js
-node_js:
-  - "0.10"
-  - "0.12"
-  - "4"
-  - "6"
-os:
-  - linux
-  - osx
-sudo: false
-addons:
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test
-    packages:
-    - g++-4.8
-osx_image: xcode8
-before_install:
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX=g++-4.8; fi
+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      sudo: false
+      node_js: "4"
+    - os: linux
+      dist: trusty
+      sudo: false
+      node_js: "6"
+    - os: linux
+      dist: trusty
+      sudo: false
+      node_js: "8"
+    - os: linux
+      dist: trusty
+      sudo: false
+      node_js: "10"
+    - os: osx
+      osx_image: xcode8.3
+      node_js: "4"
+    - os: osx
+      osx_image: xcode8.3
+      node_js: "6"
+    - os: osx
+      osx_image: xcode8.3
+      node_js: "8"
+    - os: osx
+      osx_image: xcode8.3
+      node_js: "10"
 after_success:
+  - npm install coveralls
   - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js

CONTRIBUTING.md

@@ -14,7 +14,7 @@ New bugs are assigned a `triage` label whilst under investigation.
 
 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.
+Implementation is usually straightforward if _libvips_ [already supports](https://jcupitt.github.io/libvips/API/current/) the feature you need.
 
 ## Submit a Pull Request to fix a bug
 
@@ -41,9 +41,8 @@ Any change that modifies the existing public API should be added to the relevant
 
 | Release | WIP branch |
 | ------: | :--------- |
-| v0.16.0 | pencil     |
-| v0.17.0 | quill      |
-| v0.18.0 | ridge      |
+| v0.21.0 | teeth      |
+| v0.22.0 | uptake     |
 
 Please squash your changes into a single commit using a command like `git rebase -i upstream/<wip-branch>`.
 
@@ -63,6 +62,17 @@ A method to be removed should be deprecated in the next major version then remov
 
 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.
 
+## Documentation
+
+The public API is documented with [JSDoc](http://usejsdoc.org/) annotated comments.
+
+These can be converted to Markdown by running:
+```sh
+npm run docs
+```
+
+Please include documentation updates in any Pull Request that modifies the public API.
+
 ## Run the tests
 
 ### Functional tests and static code analysis
@@ -79,15 +89,11 @@ Requires [Valgrind](http://valgrind.org/).
 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).
+Please feel free to ask any questions via a
+[new issue](https://github.com/lovell/sharp/issues/new).
+
+If you're unable to post details publicly, please
+[e-mail](https://github.com/lovell/sharp/blob/master/package.json#L4)
+for private, paid consulting.

README.md

@@ -4,6 +4,10 @@
 npm install sharp
 ```
 
+```sh
+yarn add sharp
+```
+
 The typical use case for this high speed Node.js module
 is to convert large images in common formats to
 smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
@@ -17,19 +21,21 @@ Lanczos resampling ensures quality is not sacrificed for speed.
 As well as image resizing, operations such as
 rotation, extraction, compositing and gamma correction are available.
 
-OS X, Windows (x64), Linux (x64, ARM) systems do not require
-the installation of any external runtime dependencies.
+Most modern 64-bit OS X, Windows and Linux (glibc) systems running
+Node versions 4, 6, 8 and 10
+do not require any additional install or runtime dependencies.
 
 ## Examples
 
 ```javascript
-import sharp from 'sharp';
+const sharp = require('sharp');
 ```
 
 ```javascript
 sharp(inputBuffer)
   .resize(320, 240)
   .toFile('output.webp', (err, info) => ... );
+  // A Promises/A+ promise is returned when callback is not provided.
 ```
 
 ```javascript
@@ -61,11 +67,11 @@ readableStream
 
 ### Documentation
 
-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).
+Visit [sharp.pixelplumbing.com](http://sharp.pixelplumbing.com/) for complete
+[installation instructions](http://sharp.pixelplumbing.com/page/install),
+[API documentation](http://sharp.pixelplumbing.com/page/api),
+[benchmark tests](http://sharp.pixelplumbing.com/page/performance) and
+[changelog](http://sharp.pixelplumbing.com/page/changelog).
 
 ### Contributing
 
@@ -74,7 +80,7 @@ covers reporting bugs, requesting features and submitting code changes.
 
 ### Licence
 
-Copyright 2013, 2014, 2015, 2016 Lovell Fuller and contributors.
+Copyright 2013, 2014, 2015, 2016, 2017, 2018 Lovell Fuller and contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

appveyor.yml

@@ -3,14 +3,14 @@ version: "{build}"
 build: off
 platform: x64
 environment:
-  VIPS_WARNING: 0
   matrix:
-  - nodejs_version: "0.12"
   - nodejs_version: "4"
   - nodejs_version: "6"
+  - nodejs_version: "8"
+  - nodejs_version: "10"
 install:
   - ps: Install-Product node $env:nodejs_version x64
-  - npm install -g npm@latest
+  - npm install -g npm@5
   - npm install
 test_script:
-  - npm run-script test-win
+  - npm test

binding.gyp

@@ -5,9 +5,6 @@
       ['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',
           '_ALLOW_KEYWORD_MACROS'
@@ -18,14 +15,14 @@
           'src/libvips/cplusplus/VImage.cpp'
         ],
         'include_dirs': [
-          'include',
-          'include/glib-2.0',
-          'lib/glib-2.0/include'
+          'vendor/include',
+          'vendor/include/glib-2.0',
+          'vendor/lib/glib-2.0/include'
         ],
         'libraries': [
-          '../lib/libvips.lib',
-          '../lib/libglib-2.0.lib',
-          '../lib/libgobject-2.0.lib'
+          '../vendor/lib/libvips.lib',
+          '../vendor/lib/libglib-2.0.lib',
+          '../vendor/lib/libgobject-2.0.lib'
         ],
         'configurations': {
           'Release': {
@@ -49,43 +46,22 @@
     'dependencies': [
       'libvips-cpp'
     ],
-    # Nested variables "pattern" borrowed from http://src.chromium.org/viewvc/chrome/trunk/src/build/common.gypi
     'variables': {
-      '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()")'
+          'pkg_config_path': '<!(node -e "console.log(require(\'./lib/libvips\').pkgConfigPath())")',
+          'use_global_libvips': '<!(node -e "console.log(Boolean(require(\'./lib/libvips\').useGlobalLibvips()).toString())")'
         }, {
-          'use_global_vips': ''
+          'pkg_config_path': '',
+          'use_global_libvips': ''
         }]
       ]
     },
     'sources': [
       'src/common.cc',
       'src/metadata.cc',
+      'src/stats.cc',
       'src/operations.cc',
       'src/pipeline.cc',
       'src/sharp.cc',
@@ -95,7 +71,7 @@
       '<!(node -e "require(\'nan\')")'
     ],
     'conditions': [
-      ['use_global_vips == "true"', {
+      ['use_global_libvips == "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': [
@@ -103,18 +79,20 @@
             '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)']
+          }],
+          ['OS == "linux"', {
+            'defines': [
+              # Inspect libvips-cpp.so to determine which C++11 ABI version was used and set _GLIBCXX_USE_CXX11_ABI accordingly. This is quite horrible.
+              '_GLIBCXX_USE_CXX11_ABI=<!(if readelf -Ws "$(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --variable libdir vips-cpp)/libvips-cpp.so" | c++filt | grep -qF __cxx11;then echo "1";else echo "0";fi)'
+            ]
           }]
-        ],
-        'defines': [
-          # Inspect libvips-cpp.so to determine which C++11 ABI version was used and set _GLIBCXX_USE_CXX11_ABI accordingly. This is quite horrible.
-          '_GLIBCXX_USE_CXX11_ABI=<!(if readelf -Ws "$(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs-only-L vips-cpp | cut -c 3- | sed -e "s/^$/\/usr\/lib/")/libvips-cpp.so" | c++filt | grep -qF __cxx11;then echo "1";else echo "0";fi)'
         ]
       }, {
-        # Attempt to download pre-built libvips and install locally within node_modules
+        # Use pre-built libvips stored locally within node_modules
         'include_dirs': [
-          'include',
-          'include/glib-2.0',
-          'lib/glib-2.0/include'
+          'vendor/include',
+          'vendor/include/glib-2.0',
+          'vendor/lib/glib-2.0/include'
         ],
         'conditions': [
           ['OS == "win"', {
@@ -122,65 +100,59 @@
               '_ALLOW_KEYWORD_MACROS'
             ],
             'libraries': [
-              '../lib/libvips.lib',
-              '../lib/libglib-2.0.lib',
-              '../lib/libgobject-2.0.lib'
+              '../vendor/lib/libvips.lib',
+              '../vendor/lib/libglib-2.0.lib',
+              '../vendor/lib/libgobject-2.0.lib'
             ]
           }],
           ['OS == "mac"', {
-            'variables': {
-              'download_vips': '<!(node -e "require(\'./binding\').download_vips()")'
-            },
             'libraries': [
-              '../lib/libvips-cpp.42.dylib',
-              '../lib/libvips.42.dylib',
-              '../lib/libglib-2.0.0.dylib',
-              '../lib/libgobject-2.0.0.dylib',
+              '../vendor/lib/libvips-cpp.42.dylib',
+              '../vendor/lib/libvips.42.dylib',
+              '../vendor/lib/libglib-2.0.0.dylib',
+              '../vendor/lib/libgobject-2.0.0.dylib',
               # Ensure runtime linking is relative to sharp.node
-              '-rpath \'@loader_path/../../lib\''
+              '-rpath \'@loader_path/../../vendor/lib\''
             ]
           }],
           ['OS == "linux"', {
-            'variables': {
-              'download_vips': '<!(LDD_VERSION="<!(ldd --version 2>&1 || true)" node -e "require(\'./binding\').download_vips()")'
-            },
             'defines': [
               '_GLIBCXX_USE_CXX11_ABI=0'
             ],
             'libraries': [
-              '../lib/libvips-cpp.so',
-              '../lib/libvips.so',
-              '../lib/libglib-2.0.so',
-              '../lib/libgobject-2.0.so',
+              '../vendor/lib/libvips-cpp.so',
+              '../vendor/lib/libvips.so',
+              '../vendor/lib/libglib-2.0.so',
+              '../vendor/lib/libgobject-2.0.so',
               # Dependencies of dependencies, included for openSUSE support
-              '../lib/libcairo.so',
-              '../lib/libcroco-0.6.so',
-              '../lib/libexif.so',
-              '../lib/libffi.so',
-              '../lib/libfontconfig.so',
-              '../lib/libfreetype.so',
-              '../lib/libgdk_pixbuf-2.0.so',
-              '../lib/libgif.so',
-              '../lib/libgio-2.0.so',
-              '../lib/libgmodule-2.0.so',
-              '../lib/libgsf-1.so',
-              '../lib/libgthread-2.0.so',
-              '../lib/libharfbuzz.so',
-              '../lib/libjpeg.so',
-              '../lib/liblcms2.so',
-              '../lib/liborc-0.4.so',
-              '../lib/libpango-1.0.so',
-              '../lib/libpangocairo-1.0.so',
-              '../lib/libpangoft2-1.0.so',
-              '../lib/libpixman-1.so',
-              '../lib/libpng.so',
-              '../lib/librsvg-2.so',
-              '../lib/libtiff.so',
-              '../lib/libwebp.so',
-              '../lib/libxml2.so',
-              '../lib/libz.so',
+              '../vendor/lib/libcairo.so',
+              '../vendor/lib/libcroco-0.6.so',
+              '../vendor/lib/libexif.so',
+              '../vendor/lib/libffi.so',
+              '../vendor/lib/libfontconfig.so',
+              '../vendor/lib/libfreetype.so',
+              '../vendor/lib/libgdk_pixbuf-2.0.so',
+              '../vendor/lib/libgif.so',
+              '../vendor/lib/libgio-2.0.so',
+              '../vendor/lib/libgmodule-2.0.so',
+              '../vendor/lib/libgsf-1.so',
+              '../vendor/lib/libgthread-2.0.so',
+              '../vendor/lib/libharfbuzz.so',
+              '../vendor/lib/libjpeg.so',
+              '../vendor/lib/liblcms2.so',
+              '../vendor/lib/liborc-0.4.so',
+              '../vendor/lib/libpango-1.0.so',
+              '../vendor/lib/libpangocairo-1.0.so',
+              '../vendor/lib/libpangoft2-1.0.so',
+              '../vendor/lib/libpixman-1.so',
+              '../vendor/lib/libpng.so',
+              '../vendor/lib/librsvg-2.so',
+              '../vendor/lib/libtiff.so',
+              '../vendor/lib/libwebp.so',
+              '../vendor/lib/libxml2.so',
+              '../vendor/lib/libz.so',
               # Ensure runtime linking is relative to sharp.node
-              '-Wl,--disable-new-dtags -Wl,-rpath=\'$${ORIGIN}/../../lib\''
+              '-Wl,--disable-new-dtags -Wl,-rpath=\'$${ORIGIN}/../../vendor/lib\''
             ]
           }]
         ]
@@ -216,61 +188,5 @@
         ]
       }
     },
-  }, {
-    'target_name': 'win_copy_dlls',
-    'type': 'none',
-    'dependencies': [
-      'sharp'
-    ],
-    'conditions': [
-      ['OS == "win"', {
-        # Windows lacks support for rpath
-        'copies': [{
-          'destination': 'build/Release',
-          'files': [
-            'lib/GNU.Gettext.dll',
-            'lib/libasprintf-0.dll',
-            'lib/libcairo-2.dll',
-            'lib/libcairo-gobject-2.dll',
-            'lib/libcairo-script-interpreter-2.dll',
-            'lib/libcharset-1.dll',
-            'lib/libcroco-0.6-3.dll',
-            'lib/libexif-12.dll',
-            'lib/libexpat-1.dll',
-            'lib/libffi-6.dll',
-            'lib/libfftw3-3.dll',
-            'lib/libfontconfig-1.dll',
-            'lib/libfreetype-6.dll',
-            'lib/libgcc_s_seh-1.dll',
-            'lib/libgdk_pixbuf-2.0-0.dll',
-            'lib/libgif-7.dll',
-            'lib/libgio-2.0-0.dll',
-            'lib/libglib-2.0-0.dll',
-            'lib/libgmodule-2.0-0.dll',
-            'lib/libgobject-2.0-0.dll',
-            'lib/libgsf-1-114.dll',
-            'lib/libgthread-2.0-0.dll',
-            'lib/libiconv-2.dll',
-            'lib/libintl-8.dll',
-            'lib/libjpeg-62.dll',
-            'lib/liblcms2-2.dll',
-            'lib/libpango-1.0-0.dll',
-            'lib/libpangocairo-1.0-0.dll',
-            'lib/libpangowin32-1.0-0.dll',
-            'lib/libpixman-1-0.dll',
-            'lib/libpng16-16.dll',
-            'lib/libquadmath-0.dll',
-            'lib/librsvg-2-2.dll',
-            'lib/libssp-0.dll',
-            'lib/libstdc++-6.dll',
-            'lib/libtiff-5.dll',
-            'lib/libvips-42.dll',
-            'lib/libwebp-6.dll',
-            'lib/libxml2-2.dll',
-            'lib/zlib1.dll'
-          ]
-        }]
-      }]
-    ]
   }]
 }

binding.js

@@ -1,151 +0,0 @@
-'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/';
-
-// Use NPM-provided environment variable where available, falling back to require-based method for Electron
-var minimumLibvipsVersion = process.env.npm_package_config_libvips || require('./package.json').config.libvips;
-
-var vipsHeaderPath = path.join(__dirname, 'include', 'vips', 'vips.h');
-
-var platform = process.env.npm_config_platform || process.platform;
-
-var arch = process.env.npm_config_arch || process.arch;
-var arm_version = process.env.npm_config_armv || process.config.variables.arm_version;
-
-if (arch === 'arch64' || arch === 'armhf') {
-  arch = 'arm';
-  if (arch === 'arch64') arm_version = '8';
-}
-
-// -- 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);
-};
-
-var platformId = function() {
-  var id = [platform, arch].join('-');
-  if (arch === 'arm') {
-    switch(arm_version) {
-      case '8':
-        id = id + 'v8';
-        break;
-      case '7':
-        id = id + 'v7';
-        break;
-      default:
-        id = id + 'v6';
-        break;
-    }
-  }
-  return id;
-};
-
-// 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 (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 tarFilename = ['libvips', minimumLibvipsVersion, platformId()].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,
-      minimumLibvipsVersion
-    );
-  }
-  process.stdout.write(useGlobalVips ? 'true' : 'false');
-};

circle.yml

@@ -1,6 +0,0 @@
-machine:
-  services:
-    - docker
-test:
-  override:
-    - ./packaging/test-linux-x64.sh

docs/api-channel.md

@@ -0,0 +1,110 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [extractChannel][1]
+    -   [Parameters][2]
+    -   [Examples][3]
+-   [joinChannel][4]
+    -   [Parameters][5]
+-   [bandbool][6]
+    -   [Parameters][7]
+    -   [Examples][8]
+
+## extractChannel
+
+Extract a single channel from a multi-channel image.
+
+### Parameters
+
+-   `channel` **([Number][9] \| [String][10])** zero-indexed band number to extract, or `red`, `green` or `blue` as alternative to `0`, `1` or `2` respectively.
+
+### Examples
+
+```javascript
+sharp(input)
+  .extractChannel('green')
+  .toFile('input_green.jpg', function(err, info) {
+    // info.channels === 1
+    // input_green.jpg contains the green channel of the input image
+   });
+```
+
+-   Throws **[Error][11]** Invalid channel
+
+Returns **Sharp** 
+
+## joinChannel
+
+Join one or more channels to the image.
+The meaning of the added channels depends on the output colourspace, set with `toColourspace()`.
+By default the output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
+Channel ordering follows vips convention:
+
+-   sRGB: 0: Red, 1: Green, 2: Blue, 3: Alpha.
+-   CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha.
+
+Buffers may be any of the image formats supported by sharp: JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data.
+For raw pixel input, the `options` object should contain a `raw` attribute, which follows the format of the attribute of the same name in the `sharp()` constructor.
+
+### Parameters
+
+-   `images` **([Array][12]&lt;([String][10] \| [Buffer][13])> | [String][10] \| [Buffer][13])** one or more images (file paths, Buffers).
+-   `options` **[Object][14]** image options, see `sharp()` constructor.
+
+
+-   Throws **[Error][11]** Invalid parameters
+
+Returns **Sharp** 
+
+## bandbool
+
+Perform a bitwise boolean operation on all input image channels (bands) to produce a single channel output image.
+
+### Parameters
+
+-   `boolOp` **[String][10]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+
+### Examples
+
+```javascript
+sharp('3-channel-rgb-input.png')
+  .bandbool(sharp.bool.and)
+  .toFile('1-channel-output.png', function (err, info) {
+    // The output will be a single channel image where each pixel `P = R & G & B`.
+    // If `I(1,1) = [247, 170, 14] = [0b11110111, 0b10101010, 0b00001111]`
+    // then `O(1,1) = 0b11110111 & 0b10101010 & 0b00001111 = 0b00000010 = 2`.
+  });
+```
+
+-   Throws **[Error][11]** Invalid parameters
+
+Returns **Sharp** 
+
+[1]: #extractchannel
+
+[2]: #parameters
+
+[3]: #examples
+
+[4]: #joinchannel
+
+[5]: #parameters-1
+
+[6]: #bandbool
+
+[7]: #parameters-2
+
+[8]: #examples-1
+
+[9]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[12]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
+
+[13]: https://nodejs.org/api/buffer.html
+
+[14]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object

docs/api-colour.md

@@ -0,0 +1,136 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [background][1]
+    -   [Parameters][2]
+-   [tint][3]
+    -   [Parameters][4]
+-   [greyscale][5]
+    -   [Parameters][6]
+-   [grayscale][7]
+    -   [Parameters][8]
+-   [toColourspace][9]
+    -   [Parameters][10]
+-   [toColorspace][11]
+    -   [Parameters][12]
+
+## background
+
+Set the background for the `embed`, `flatten` and `extend` operations.
+The default background is `{r: 0, g: 0, b: 0, alpha: 1}`, black without transparency.
+
+Delegates to the _color_ module, which can throw an Error
+but is liberal in what it accepts, clipping values to sensible min/max.
+The alpha value is a float between `0` (transparent) and `1` (opaque).
+
+### Parameters
+
+-   `rgba` **([String][13] \| [Object][14])** parsed by the [color][15] module to extract values for red, green, blue and alpha.
+
+
+-   Throws **[Error][16]** Invalid parameter
+
+Returns **Sharp** 
+
+## tint
+
+Tint the image using the provided chroma while preserving the image luminance.
+An alpha channel may be present and will be unchanged by the operation.
+
+### Parameters
+
+-   `rgb` **([String][13] \| [Object][14])** parsed by the [color][15] module to extract chroma values.
+
+
+-   Throws **[Error][16]** Invalid parameter
+
+Returns **Sharp** 
+
+## 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.
+By default the output image will be web-friendly sRGB and contain three (identical) color channels.
+This may be overridden by other sharp operations such as `toColourspace('b-w')`,
+which will produce an output image containing one color channel.
+An alpha channel may be present, and will be unchanged by the operation.
+
+### Parameters
+
+-   `greyscale` **[Boolean][17]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## grayscale
+
+Alternative spelling of `greyscale`.
+
+### Parameters
+
+-   `grayscale` **[Boolean][17]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## toColourspace
+
+Set the output colourspace.
+By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
+
+### Parameters
+
+-   `colourspace` **[String][13]?** output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][18]
+
+
+-   Throws **[Error][16]** Invalid parameters
+
+Returns **Sharp** 
+
+## toColorspace
+
+Alternative spelling of `toColourspace`.
+
+### Parameters
+
+-   `colorspace` **[String][13]?** output colorspace.
+
+
+-   Throws **[Error][16]** Invalid parameters
+
+Returns **Sharp** 
+
+[1]: #background
+
+[2]: #parameters
+
+[3]: #tint
+
+[4]: #parameters-1
+
+[5]: #greyscale
+
+[6]: #parameters-2
+
+[7]: #grayscale
+
+[8]: #parameters-3
+
+[9]: #tocolourspace
+
+[10]: #parameters-4
+
+[11]: #tocolorspace
+
+[12]: #parameters-5
+
+[13]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[14]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[15]: https://www.npmjs.org/package/color
+
+[16]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[17]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[18]: https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568

docs/api-composite.md

@@ -0,0 +1,81 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [overlayWith][1]
+    -   [Parameters][2]
+    -   [Examples][3]
+
+## overlayWith
+
+Overlay (composite) an image over the processed (resized, extracted etc.) image.
+
+The overlay image must be the same size or smaller than the processed image.
+If both `top` and `left` options are provided, they take precedence over `gravity`.
+
+If the overlay image contains an alpha channel then composition with premultiplication will occur.
+
+### Parameters
+
+-   `overlay` **([Buffer][4] \| [String][5])** Buffer containing image data or String containing the path to an image file.
+-   `options` **[Object][6]?** 
+    -   `options.gravity` **[String][5]** gravity at which to place the overlay. (optional, default `'centre'`)
+    -   `options.top` **[Number][7]?** the pixel offset from the top edge.
+    -   `options.left` **[Number][7]?** the pixel offset from the left edge.
+    -   `options.tile` **[Boolean][8]** set to true to repeat the overlay image across the entire image with the given `gravity`. (optional, default `false`)
+    -   `options.cutout` **[Boolean][8]** set to true to apply only the alpha channel of the overlay image to the input image, giving the appearance of one image being cut out of another. (optional, default `false`)
+    -   `options.density` **[Number][7]** integral number representing the DPI for vector overlay image. (optional, default `72`)
+    -   `options.raw` **[Object][6]?** describes overlay when using raw pixel data.
+        -   `options.raw.width` **[Number][7]?** 
+        -   `options.raw.height` **[Number][7]?** 
+        -   `options.raw.channels` **[Number][7]?** 
+    -   `options.create` **[Object][6]?** describes a blank overlay to be created.
+        -   `options.create.width` **[Number][7]?** 
+        -   `options.create.height` **[Number][7]?** 
+        -   `options.create.channels` **[Number][7]?** 3-4
+        -   `options.create.background` **([String][5] \| [Object][6])?** parsed by the [color][9] module to extract values for red, green, blue and alpha.
+
+### Examples
+
+```javascript
+sharp('input.png')
+  .rotate(180)
+  .resize(300)
+  .flatten()
+  .background('#ff6600')
+  .overlayWith('overlay.png', { gravity: sharp.gravity.southeast } )
+  .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 with SE gravity,
+    // sharpened, with metadata, 90% quality WebP image data. Phew!
+  });
+```
+
+-   Throws **[Error][10]** Invalid parameters
+
+Returns **Sharp** 
+
+[1]: #overlaywith
+
+[2]: #parameters
+
+[3]: #examples
+
+[4]: https://nodejs.org/api/buffer.html
+
+[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[9]: https://www.npmjs.org/package/color
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error

docs/api-constructor.md

@@ -0,0 +1,151 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [Sharp][1]
+    -   [Parameters][2]
+    -   [Examples][3]
+    -   [format][4]
+        -   [Examples][5]
+    -   [versions][6]
+        -   [Examples][7]
+-   [queue][8]
+    -   [Examples][9]
+
+## Sharp
+
+### Parameters
+
+-   `input` **([Buffer][10] \| [String][11])?** if present, can be
+     a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
+     a String containing the path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file.
+     JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
+-   `options` **[Object][12]?** if present, is an Object with optional attributes.
+    -   `options.failOnError` **[Boolean][13]** by default apply a "best effort"
+         to decode images, even if the data is corrupt or invalid. Set this flag to true
+         if you'd rather halt processing and raise an error when loading invalid images. (optional, default `false`)
+    -   `options.density` **[Number][14]** integral number representing the DPI for vector images. (optional, default `72`)
+    -   `options.page` **[Number][14]** page number to extract for multi-page input (GIF, TIFF) (optional, default `0`)
+    -   `options.raw` **[Object][12]?** describes raw pixel input image data. See `raw()` for pixel ordering.
+        -   `options.raw.width` **[Number][14]?** 
+        -   `options.raw.height` **[Number][14]?** 
+        -   `options.raw.channels` **[Number][14]?** 1-4
+    -   `options.create` **[Object][12]?** describes a new image to be created.
+        -   `options.create.width` **[Number][14]?** 
+        -   `options.create.height` **[Number][14]?** 
+        -   `options.create.channels` **[Number][14]?** 3-4
+        -   `options.create.background` **([String][11] \| [Object][12])?** parsed by the [color][15] module to extract values for red, green, blue and alpha.
+
+### Examples
+
+```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
+  });
+```
+
+```javascript
+// Read image data from readableStream,
+// resize to 300 pixels wide,
+// emit an 'info' event with calculated dimensions
+// and finally write image data to writableStream
+var transformer = sharp()
+  .resize(300)
+  .on('info', function(info) {
+    console.log('Image height is ' + info.height);
+  });
+readableStream.pipe(transformer).pipe(writableStream);
+```
+
+```javascript
+// Create a blank 300x200 PNG image of semi-transluent red pixels
+sharp({
+  create: {
+    width: 300,
+    height: 200,
+    channels: 4,
+    background: { r: 255, g: 0, b: 0, alpha: 128 }
+  }
+})
+.png()
+.toBuffer()
+.then( ... );
+```
+
+-   Throws **[Error][16]** Invalid parameters
+
+Returns **[Sharp][17]** 
+
+### format
+
+An Object containing nested boolean values representing the available input and output formats/methods.
+
+#### Examples
+
+```javascript
+console.log(sharp.format);
+```
+
+Returns **[Object][12]** 
+
+### versions
+
+An Object containing the version numbers of libvips and its dependencies.
+
+#### Examples
+
+```javascript
+console.log(sharp.versions);
+```
+
+## queue
+
+An EventEmitter that emits a `change` event when a task is either:
+
+-   queued, waiting for _libuv_ to provide a worker thread
+-   complete
+
+### Examples
+
+```javascript
+sharp.queue.on('change', function(queueLength) {
+  console.log('Queue contains ' + queueLength + ' task(s)');
+});
+```
+
+[1]: #sharp
+
+[2]: #parameters
+
+[3]: #examples
+
+[4]: #format
+
+[5]: #examples-1
+
+[6]: #versions
+
+[7]: #examples-2
+
+[8]: #queue
+
+[9]: #examples-3
+
+[10]: https://nodejs.org/api/buffer.html
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[12]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[13]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[14]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[15]: https://www.npmjs.org/package/color
+
+[16]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[17]: #sharp

docs/api-input.md

@@ -0,0 +1,183 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [clone][1]
+    -   [Examples][2]
+-   [metadata][3]
+    -   [Parameters][4]
+    -   [Examples][5]
+-   [stats][6]
+    -   [Parameters][7]
+    -   [Examples][8]
+-   [limitInputPixels][9]
+    -   [Parameters][10]
+-   [sequentialRead][11]
+    -   [Parameters][12]
+
+## clone
+
+Take a "snapshot" of the Sharp instance, returning a new instance.
+Cloned instances inherit the input of their parent instance.
+This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream.
+
+### Examples
+
+```javascript
+const 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
+```
+
+Returns **Sharp** 
+
+## metadata
+
+Fast access to (uncached) image metadata without decoding any compressed image data.
+A Promises/A+ promise is returned when `callback` is not provided.
+
+-   `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
+-   `width`: Number of pixels wide (EXIF orientation is not taken into consideration)
+-   `height`: Number of pixels high (EXIF orientation is not taken into consideration)
+-   `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][13]
+-   `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
+-   `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...][14]
+-   `density`: Number of pixels per inch (DPI), if present
+-   `hasProfile`: Boolean indicating the presence of an embedded ICC profile
+-   `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
+-   `orientation`: Number value of the EXIF Orientation header, if present
+-   `exif`: Buffer containing raw EXIF data, if present
+-   `icc`: Buffer containing raw [ICC][15] profile data, if present
+-   `iptc`: Buffer containing raw IPTC data, if present
+-   `xmp`: Buffer containing raw XMP data, if present
+
+### Parameters
+
+-   `callback` **[Function][16]?** called with the arguments `(err, metadata)`
+
+### Examples
+
+```javascript
+const 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
+  });
+```
+
+Returns **([Promise][17]&lt;[Object][18]> | Sharp)** 
+
+## stats
+
+Access to pixel-derived image statistics for every channel in the image.
+A Promise is returned when `callback` is not provided.
+
+-   `channels`: Array of channel statistics for each channel in the image. Each channel statistic contains
+    -   `min` (minimum value in the channel)
+    -   `max` (maximum value in the channel)
+    -   `sum` (sum of all values in a channel)
+    -   `squaresSum` (sum of squared values in a channel)
+    -   `mean` (mean of the values in a channel)
+    -   `stdev` (standard deviation for the values in a channel)
+    -   `minX` (x-coordinate of one of the pixel where the minimum lies)
+    -   `minY` (y-coordinate of one of the pixel where the minimum lies)
+    -   `maxX` (x-coordinate of one of the pixel where the maximum lies)
+    -   `maxY` (y-coordinate of one of the pixel where the maximum lies)
+-   `isOpaque`: Value to identify if the image is opaque or transparent, based on the presence and use of alpha channel
+
+### Parameters
+
+-   `callback` **[Function][16]?** called with the arguments `(err, stats)`
+
+### Examples
+
+```javascript
+const image = sharp(inputJpg);
+image
+  .stats()
+  .then(function(stats) {
+     // stats contains the channel-wise statistics array and the isOpaque value
+  });
+```
+
+Returns **[Promise][17]&lt;[Object][18]>** 
+
+## limitInputPixels
+
+Do not process input images where the number of pixels (width _ height) exceeds this limit.
+Assumes image dimensions contained in the input metadata can be trusted.
+The default limit is 268402689 (0x3FFF _ 0x3FFF) pixels.
+
+### Parameters
+
+-   `limit` **([Number][19] \| [Boolean][20])** an integral Number of pixels, zero or false to remove limit, true to use default limit.
+
+
+-   Throws **[Error][21]** Invalid limit
+
+Returns **Sharp** 
+
+## 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.
+
+The default behaviour _before_ function call is `false`, meaning the libvips access method is not sequential.
+
+### Parameters
+
+-   `sequentialRead` **[Boolean][20]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+[1]: #clone
+
+[2]: #examples
+
+[3]: #metadata
+
+[4]: #parameters
+
+[5]: #examples-1
+
+[6]: #stats
+
+[7]: #parameters-1
+
+[8]: #examples-2
+
+[9]: #limitinputpixels
+
+[10]: #parameters-2
+
+[11]: #sequentialread
+
+[12]: #parameters-3
+
+[13]: https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L636
+
+[14]: https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L672
+
+[15]: https://www.npmjs.com/package/icc
+
+[16]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
+
+[17]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
+
+[18]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[19]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[20]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[21]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error

docs/api-operation.md

@@ -0,0 +1,469 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [rotate][1]
+    -   [Parameters][2]
+    -   [Examples][3]
+-   [extract][4]
+    -   [Parameters][5]
+    -   [Examples][6]
+-   [flip][7]
+    -   [Parameters][8]
+-   [flop][9]
+    -   [Parameters][10]
+-   [sharpen][11]
+    -   [Parameters][12]
+-   [median][13]
+    -   [Parameters][14]
+-   [blur][15]
+    -   [Parameters][16]
+-   [extend][17]
+    -   [Parameters][18]
+    -   [Examples][19]
+-   [flatten][20]
+    -   [Parameters][21]
+-   [trim][22]
+    -   [Parameters][23]
+-   [gamma][24]
+    -   [Parameters][25]
+-   [negate][26]
+    -   [Parameters][27]
+-   [normalise][28]
+    -   [Parameters][29]
+-   [normalize][30]
+    -   [Parameters][31]
+-   [convolve][32]
+    -   [Parameters][33]
+    -   [Examples][34]
+-   [threshold][35]
+    -   [Parameters][36]
+-   [boolean][37]
+    -   [Parameters][38]
+-   [linear][39]
+    -   [Parameters][40]
+
+## rotate
+
+Rotate the output image by either an explicit angle
+or auto-orient based on the EXIF `Orientation` tag.
+
+If an angle is provided, it is converted to a valid 90/180/270deg rotation.
+For example, `-450` will produce a 270deg rotation.
+
+If no angle is provided, it is determined from the EXIF data.
+Mirroring is supported and may infer the use of a flip operation.
+
+The use of `rotate` implies the removal of the EXIF `Orientation` tag, if any.
+
+Method order is important when both rotating and extracting regions,
+for example `rotate(x).extract(y)` will produce a different result to `extract(y).rotate(x)`.
+
+### Parameters
+
+-   `angle` **[Number][41]** angle of rotation, must be a multiple of 90. (optional, default `auto`)
+
+### Examples
+
+```javascript
+const pipeline = sharp()
+  .rotate()
+  .resize(null, 200)
+  .toBuffer(function (err, outputBuffer, info) {
+    // outputBuffer contains 200px high JPEG image data,
+    // auto-rotated using EXIF Orientation tag
+    // info.width and info.height contain the dimensions of the resized image
+  });
+readableStream.pipe(pipeline);
+```
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## extract
+
+Extract a region of the image.
+
+-   Use `extract` before `resize` for pre-resize extraction.
+-   Use `extract` after `resize` for post-resize extraction.
+-   Use `extract` before and after for both.
+
+### Parameters
+
+-   `options` **[Object][43]** 
+    -   `options.left` **[Number][41]** zero-indexed offset from left edge
+    -   `options.top` **[Number][41]** zero-indexed offset from top edge
+    -   `options.width` **[Number][41]** dimension of extracted image
+    -   `options.height` **[Number][41]** dimension of extracted image
+
+### Examples
+
+```javascript
+sharp(input)
+  .extract({ left: left, top: top, width: width, height: height })
+  .toFile(output, function(err) {
+    // Extract a region of the input image, saving in the same format.
+  });
+```
+
+```javascript
+sharp(input)
+  .extract({ left: leftOffsetPre, top: topOffsetPre, width: widthPre, height: heightPre })
+  .resize(width, height)
+  .extract({ left: leftOffsetPost, top: topOffsetPost, width: widthPost, height: heightPost })
+  .toFile(output, function(err) {
+    // Extract a region, resize, then extract from the resized image
+  });
+```
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## 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.
+
+### Parameters
+
+-   `flip` **[Boolean][44]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## 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.
+
+### Parameters
+
+-   `flop` **[Boolean][44]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## sharpen
+
+Sharpen the image.
+When used without parameters, performs a fast, mild sharpen of the output image.
+When a `sigma` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space.
+Separate control over the level of sharpening in "flat" and "jagged" areas is available.
+
+### Parameters
+
+-   `sigma` **[Number][41]?** the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+-   `flat` **[Number][41]** the level of sharpening to apply to "flat" areas. (optional, default `1.0`)
+-   `jagged` **[Number][41]** the level of sharpening to apply to "jagged" areas. (optional, default `2.0`)
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## median
+
+Apply median filter.
+When used without parameters the default window is 3x3.
+
+### Parameters
+
+-   `size` **[Number][41]** square mask size: size x size (optional, default `3`)
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## blur
+
+Blur the image.
+When used without parameters, performs a fast, mild blur of the output image.
+When a `sigma` is provided, performs a slower, more accurate Gaussian blur.
+
+### Parameters
+
+-   `sigma` **[Number][41]?** a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## extend
+
+Extends/pads the edges of the image with the colour provided to the `background` method.
+This operation will always occur after resizing and extraction, if any.
+
+### Parameters
+
+-   `extend` **([Number][41] \| [Object][43])** single pixel count to add to all edges or an Object with per-edge counts
+    -   `extend.top` **[Number][41]?** 
+    -   `extend.left` **[Number][41]?** 
+    -   `extend.bottom` **[Number][41]?** 
+    -   `extend.right` **[Number][41]?** 
+
+### Examples
+
+```javascript
+// Resize to 140 pixels wide, then add 10 transparent pixels
+// to the top, left and right edges and 20 to the bottom edge
+sharp(input)
+  .resize(140)
+  .background({r: 0, g: 0, b: 0, alpha: 0})
+  .extend({top: 10, bottom: 20, left: 10, right: 10})
+  ...
+```
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## flatten
+
+Merge alpha transparency channel, if any, with `background`.
+
+### Parameters
+
+-   `flatten` **[Boolean][44]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## trim
+
+Trim "boring" pixels from all edges that contain values within a percentage similarity of the top-left pixel.
+
+### Parameters
+
+-   `tolerance` **[Number][41]** value between 1 and 99 representing the percentage similarity. (optional, default `10`)
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## 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`.
+This can improve the perceived brightness of a resized image in non-linear colour spaces.
+JPEG and WebP input images will not take advantage of the shrink-on-load performance optimisation
+when applying a gamma correction.
+
+### Parameters
+
+-   `gamma` **[Number][41]** value between 1.0 and 3.0. (optional, default `2.2`)
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## negate
+
+Produce the "negative" of the image.
+
+### Parameters
+
+-   `negate` **[Boolean][44]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## normalise
+
+Enhance output image contrast by stretching its luminance to cover the full dynamic range.
+
+### Parameters
+
+-   `normalise` **[Boolean][44]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## normalize
+
+Alternative spelling of normalise.
+
+### Parameters
+
+-   `normalize` **[Boolean][44]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+## convolve
+
+Convolve the image with the specified kernel.
+
+### Parameters
+
+-   `kernel` **[Object][43]** 
+    -   `kernel.width` **[Number][41]** width of the kernel in pixels.
+    -   `kernel.height` **[Number][41]** width of the kernel in pixels.
+    -   `kernel.kernel` **[Array][45]&lt;[Number][41]>** Array of length `width*height` containing the kernel values.
+    -   `kernel.scale` **[Number][41]** the scale of the kernel in pixels. (optional, default `sum`)
+    -   `kernel.offset` **[Number][41]** the offset of the kernel in pixels. (optional, default `0`)
+
+### Examples
+
+```javascript
+sharp(input)
+  .convolve({
+    width: 3,
+    height: 3,
+    kernel: [-1, 0, 1, -2, 0, 2, -1, 0, 1]
+  })
+  .raw()
+  .toBuffer(function(err, data, info) {
+    // data contains the raw pixel data representing the convolution
+    // of the input image with the horizontal Sobel operator
+  });
+```
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## threshold
+
+Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
+
+### Parameters
+
+-   `threshold` **[Number][41]** a value in the range 0-255 representing the level at which the threshold will be applied. (optional, default `128`)
+-   `options` **[Object][43]?** 
+    -   `options.greyscale` **[Boolean][44]** convert to single channel greyscale. (optional, default `true`)
+    -   `options.grayscale` **[Boolean][44]** alternative spelling for greyscale. (optional, default `true`)
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## boolean
+
+Perform a bitwise boolean operation with operand image.
+
+This operation creates an output image where each pixel is the result of
+the selected bitwise boolean `operation` between the corresponding pixels of the input images.
+
+### Parameters
+
+-   `operand` **([Buffer][46] \| [String][47])** Buffer containing image data or String containing the path to an image file.
+-   `operator` **[String][47]** one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+-   `options` **[Object][43]?** 
+    -   `options.raw` **[Object][43]?** describes operand when using raw pixel data.
+        -   `options.raw.width` **[Number][41]?** 
+        -   `options.raw.height` **[Number][41]?** 
+        -   `options.raw.channels` **[Number][41]?** 
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+## linear
+
+Apply the linear formula a \* input + b to the image (levels adjustment)
+
+### Parameters
+
+-   `a` **[Number][41]** multiplier (optional, default `1.0`)
+-   `b` **[Number][41]** offset (optional, default `0.0`)
+
+
+-   Throws **[Error][42]** Invalid parameters
+
+Returns **Sharp** 
+
+[1]: #rotate
+
+[2]: #parameters
+
+[3]: #examples
+
+[4]: #extract
+
+[5]: #parameters-1
+
+[6]: #examples-1
+
+[7]: #flip
+
+[8]: #parameters-2
+
+[9]: #flop
+
+[10]: #parameters-3
+
+[11]: #sharpen
+
+[12]: #parameters-4
+
+[13]: #median
+
+[14]: #parameters-5
+
+[15]: #blur
+
+[16]: #parameters-6
+
+[17]: #extend
+
+[18]: #parameters-7
+
+[19]: #examples-2
+
+[20]: #flatten
+
+[21]: #parameters-8
+
+[22]: #trim
+
+[23]: #parameters-9
+
+[24]: #gamma
+
+[25]: #parameters-10
+
+[26]: #negate
+
+[27]: #parameters-11
+
+[28]: #normalise
+
+[29]: #parameters-12
+
+[30]: #normalize
+
+[31]: #parameters-13
+
+[32]: #convolve
+
+[33]: #parameters-14
+
+[34]: #examples-3
+
+[35]: #threshold
+
+[36]: #parameters-15
+
+[37]: #boolean
+
+[38]: #parameters-16
+
+[39]: #linear
+
+[40]: #parameters-17
+
+[41]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[42]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[43]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[44]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[45]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
+
+[46]: https://nodejs.org/api/buffer.html
+
+[47]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String

docs/api-output.md

@@ -0,0 +1,402 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [toFile][1]
+    -   [Parameters][2]
+    -   [Examples][3]
+-   [toBuffer][4]
+    -   [Parameters][5]
+    -   [Examples][6]
+-   [withMetadata][7]
+    -   [Parameters][8]
+    -   [Examples][9]
+-   [jpeg][10]
+    -   [Parameters][11]
+    -   [Examples][12]
+-   [png][13]
+    -   [Parameters][14]
+    -   [Examples][15]
+-   [webp][16]
+    -   [Parameters][17]
+    -   [Examples][18]
+-   [tiff][19]
+    -   [Parameters][20]
+    -   [Examples][21]
+-   [raw][22]
+    -   [Examples][23]
+-   [toFormat][24]
+    -   [Parameters][25]
+    -   [Examples][26]
+-   [tile][27]
+    -   [Parameters][28]
+    -   [Examples][29]
+
+## toFile
+
+Write output image data to a file.
+
+If an explicit output format is not selected, it will be inferred from the extension,
+with JPEG, PNG, WebP, TIFF, DZI, and libvips' V format supported.
+Note that raw pixel data is only supported for buffer output.
+
+A `Promise` is returned when `callback` is not provided.
+
+### Parameters
+
+-   `fileOut` **[String][30]** the path to write the image data to.
+-   `callback` **[Function][31]?** called on completion with two arguments `(err, info)`.
+    `info` contains the output image `format`, `size` (bytes), `width`, `height`,
+    `channels` and `premultiplied` (indicating if premultiplication was used).
+    When using a crop strategy also contains `cropOffsetLeft` and `cropOffsetTop`.
+
+### Examples
+
+```javascript
+sharp(input)
+  .toFile('output.png', (err, info) => { ... });
+```
+
+```javascript
+sharp(input)
+  .toFile('output.png')
+  .then(info => { ... })
+  .catch(err => { ... });
+```
+
+-   Throws **[Error][32]** Invalid parameters
+
+Returns **[Promise][33]&lt;[Object][34]>** when no callback is provided
+
+## toBuffer
+
+Write output to a Buffer.
+JPEG, PNG, WebP, TIFF and RAW output are supported.
+By default, the format will match the input image, except GIF and SVG input which become PNG output.
+
+`callback`, if present, gets three arguments `(err, data, info)` where:
+
+-   `err` is an error, if any.
+-   `data` is the output image data.
+-   `info` contains the output image `format`, `size` (bytes), `width`, `height`,
+    `channels` and `premultiplied` (indicating if premultiplication was used).
+    When using a crop strategy also contains `cropOffsetLeft` and `cropOffsetTop`.
+
+A `Promise` is returned when `callback` is not provided.
+
+### Parameters
+
+-   `options` **[Object][34]?** 
+    -   `options.resolveWithObject` **[Boolean][35]?** Resolve the Promise with an Object containing `data` and `info` properties instead of resolving only with `data`.
+-   `callback` **[Function][31]?** 
+
+### Examples
+
+```javascript
+sharp(input)
+  .toBuffer((err, data, info) => { ... });
+```
+
+```javascript
+sharp(input)
+  .toBuffer()
+  .then(data => { ... })
+  .catch(err => { ... });
+```
+
+```javascript
+sharp(input)
+  .toBuffer({ resolveWithObject: true })
+  .then(({ data, info }) => { ... })
+  .catch(err => { ... });
+```
+
+Returns **[Promise][33]&lt;[Buffer][36]>** when no callback is provided
+
+## withMetadata
+
+Include all metadata (EXIF, XMP, IPTC) from the input image in the output image.
+The default behaviour, when `withMetadata` is not used, is to strip all metadata and convert to the device-independent sRGB colour space.
+This will also convert to and add a web-friendly sRGB ICC profile.
+
+### Parameters
+
+-   `withMetadata` **[Object][34]?** 
+    -   `withMetadata.orientation` **[Number][37]?** value between 1 and 8, used to update the EXIF `Orientation` tag.
+
+### Examples
+
+```javascript
+sharp('input.jpg')
+  .withMetadata()
+  .toFile('output-with-metadata.jpg')
+  .then(info => { ... });
+```
+
+-   Throws **[Error][32]** Invalid parameters
+
+Returns **Sharp** 
+
+## jpeg
+
+Use these JPEG options for output image.
+
+### Parameters
+
+-   `options` **[Object][34]?** output options
+    -   `options.quality` **[Number][37]** quality, integer 1-100 (optional, default `80`)
+    -   `options.progressive` **[Boolean][35]** use progressive (interlace) scan (optional, default `false`)
+    -   `options.chromaSubsampling` **[String][30]** set to '4:4:4' to prevent chroma subsampling when quality &lt;= 90 (optional, default `'4:2:0'`)
+    -   `options.trellisQuantisation` **[Boolean][35]** apply trellis quantisation, requires mozjpeg (optional, default `false`)
+    -   `options.overshootDeringing` **[Boolean][35]** apply overshoot deringing, requires mozjpeg (optional, default `false`)
+    -   `options.optimiseScans` **[Boolean][35]** optimise progressive scans, forces progressive, requires mozjpeg (optional, default `false`)
+    -   `options.optimizeScans` **[Boolean][35]** alternative spelling of optimiseScans (optional, default `false`)
+    -   `options.force` **[Boolean][35]** force JPEG output, otherwise attempt to use input format (optional, default `true`)
+
+### Examples
+
+```javascript
+// Convert any input to very high quality JPEG output
+const data = await sharp(input)
+  .jpeg({
+    quality: 100,
+    chromaSubsampling: '4:4:4'
+  })
+  .toBuffer();
+```
+
+-   Throws **[Error][32]** Invalid options
+
+Returns **Sharp** 
+
+## png
+
+Use these PNG options for output image.
+
+PNG output is always full colour at 8 or 16 bits per pixel.
+Indexed PNG input at 1, 2 or 4 bits per pixel is converted to 8 bits per pixel.
+
+### Parameters
+
+-   `options` **[Object][34]?** 
+    -   `options.progressive` **[Boolean][35]** use progressive (interlace) scan (optional, default `false`)
+    -   `options.compressionLevel` **[Number][37]** zlib compression level, 0-9 (optional, default `9`)
+    -   `options.adaptiveFiltering` **[Boolean][35]** use adaptive row filtering (optional, default `false`)
+    -   `options.force` **[Boolean][35]** force PNG output, otherwise attempt to use input format (optional, default `true`)
+
+### Examples
+
+```javascript
+// Convert any input to PNG output
+const data = await sharp(input)
+  .png()
+  .toBuffer();
+```
+
+-   Throws **[Error][32]** Invalid options
+
+Returns **Sharp** 
+
+## webp
+
+Use these WebP options for output image.
+
+### Parameters
+
+-   `options` **[Object][34]?** output options
+    -   `options.quality` **[Number][37]** quality, integer 1-100 (optional, default `80`)
+    -   `options.alphaQuality` **[Number][37]** quality of alpha layer, integer 0-100 (optional, default `100`)
+    -   `options.lossless` **[Boolean][35]** use lossless compression mode (optional, default `false`)
+    -   `options.nearLossless` **[Boolean][35]** use near_lossless compression mode (optional, default `false`)
+    -   `options.force` **[Boolean][35]** force WebP output, otherwise attempt to use input format (optional, default `true`)
+
+### Examples
+
+```javascript
+// Convert any input to lossless WebP output
+const data = await sharp(input)
+  .webp({ lossless: true })
+  .toBuffer();
+```
+
+-   Throws **[Error][32]** Invalid options
+
+Returns **Sharp** 
+
+## tiff
+
+Use these TIFF options for output image.
+
+### Parameters
+
+-   `options` **[Object][34]?** output options
+    -   `options.quality` **[Number][37]** quality, integer 1-100 (optional, default `80`)
+    -   `options.force` **[Boolean][35]** force TIFF output, otherwise attempt to use input format (optional, default `true`)
+    -   `options.compression` **[Boolean][35]** compression options: lzw, deflate, jpeg, ccittfax4 (optional, default `'jpeg'`)
+    -   `options.predictor` **[Boolean][35]** compression predictor options: none, horizontal, float (optional, default `'horizontal'`)
+    -   `options.xres` **[Number][37]** horizontal resolution in pixels/mm (optional, default `1.0`)
+    -   `options.yres` **[Number][37]** vertical resolution in pixels/mm (optional, default `1.0`)
+    -   `options.squash` **[Boolean][35]** squash 8-bit images down to 1 bit (optional, default `false`)
+
+### Examples
+
+```javascript
+// Convert SVG input to LZW-compressed, 1 bit per pixel TIFF output
+sharp('input.svg')
+  .tiff({
+    compression: 'lzw',
+    squash: true
+  })
+  .toFile('1-bpp-output.tiff')
+  .then(info => { ... });
+```
+
+-   Throws **[Error][32]** Invalid options
+
+Returns **Sharp** 
+
+## raw
+
+Force output to be raw, uncompressed uint8 pixel data.
+
+### Examples
+
+```javascript
+// Extract raw RGB pixel data from JPEG input
+const { data, info } = await sharp('input.jpg')
+  .raw()
+  .toBuffer({ resolveWithObject: true });
+```
+
+Returns **Sharp** 
+
+## toFormat
+
+Force output to a given format.
+
+### Parameters
+
+-   `format` **([String][30] \| [Object][34])** as a String or an Object with an 'id' attribute
+-   `options` **[Object][34]** output options
+
+### Examples
+
+```javascript
+// Convert any input to PNG output
+const data = await sharp(input)
+  .toFormat('png')
+  .toBuffer();
+```
+
+-   Throws **[Error][32]** unsupported format or options
+
+Returns **Sharp** 
+
+## tile
+
+Use tile-based deep zoom (image pyramid) output.
+Set the format and options for tile images via the `toFormat`, `jpeg`, `png` or `webp` functions.
+Use a `.zip` or `.szi` file extension with `toFile` to write to a compressed archive file format.
+
+Warning: multiple sharp instances concurrently producing tile output can expose a possible race condition in some versions of libgsf.
+
+### Parameters
+
+-   `tile` **[Object][34]?** 
+    -   `tile.size` **[Number][37]** tile size in pixels, a value between 1 and 8192. (optional, default `256`)
+    -   `tile.overlap` **[Number][37]** tile overlap in pixels, a value between 0 and 8192. (optional, default `0`)
+    -   `tile.angle` **[Number][37]** tile angle of rotation, must be a multiple of 90. (optional, default `0`)
+    -   `tile.container` **[String][30]** tile container, with value `fs` (filesystem) or `zip` (compressed file). (optional, default `'fs'`)
+    -   `tile.layout` **[String][30]** filesystem layout, possible values are `dz`, `zoomify` or `google`. (optional, default `'dz'`)
+
+### Examples
+
+```javascript
+sharp('input.tiff')
+  .png()
+  .tile({
+    size: 512
+  })
+  .toFile('output.dz', function(err, info) {
+    // output.dzi is the Deep Zoom XML definition
+    // output_files contains 512x512 tiles grouped by zoom level
+  });
+```
+
+-   Throws **[Error][32]** Invalid parameters
+
+Returns **Sharp** 
+
+[1]: #tofile
+
+[2]: #parameters
+
+[3]: #examples
+
+[4]: #tobuffer
+
+[5]: #parameters-1
+
+[6]: #examples-1
+
+[7]: #withmetadata
+
+[8]: #parameters-2
+
+[9]: #examples-2
+
+[10]: #jpeg
+
+[11]: #parameters-3
+
+[12]: #examples-3
+
+[13]: #png
+
+[14]: #parameters-4
+
+[15]: #examples-4
+
+[16]: #webp
+
+[17]: #parameters-5
+
+[18]: #examples-5
+
+[19]: #tiff
+
+[20]: #parameters-6
+
+[21]: #examples-6
+
+[22]: #raw
+
+[23]: #examples-7
+
+[24]: #toformat
+
+[25]: #parameters-7
+
+[26]: #examples-8
+
+[27]: #tile
+
+[28]: #parameters-8
+
+[29]: #examples-9
+
+[30]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[31]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
+
+[32]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[33]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
+
+[34]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[35]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[36]: https://nodejs.org/api/buffer.html
+
+[37]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number

docs/api-resize.md

@@ -0,0 +1,230 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [resize][1]
+    -   [Parameters][2]
+    -   [Examples][3]
+-   [crop][4]
+    -   [Parameters][5]
+    -   [Examples][6]
+-   [embed][7]
+    -   [Parameters][8]
+    -   [Examples][9]
+-   [max][10]
+    -   [Examples][11]
+-   [min][12]
+-   [ignoreAspectRatio][13]
+-   [withoutEnlargement][14]
+    -   [Parameters][15]
+
+## resize
+
+Resize image to `width` x `height`.
+By default, the resized image is centre cropped to the exact size specified.
+
+Possible kernels are:
+
+-   `nearest`: Use [nearest neighbour interpolation][16].
+-   `cubic`: Use a [Catmull-Rom spline][17].
+-   `lanczos2`: Use a [Lanczos kernel][18] with `a=2`.
+-   `lanczos3`: Use a Lanczos kernel with `a=3` (the default).
+
+### Parameters
+
+-   `width` **[Number][19]?** pixels wide the resultant image should be. Use `null` or `undefined` to auto-scale the width to match the height.
+-   `height` **[Number][19]?** pixels high the resultant image should be. Use `null` or `undefined` to auto-scale the height to match the width.
+-   `options` **[Object][20]?** 
+    -   `options.kernel` **[String][21]** the kernel to use for image reduction. (optional, default `'lanczos3'`)
+    -   `options.fastShrinkOnLoad` **[Boolean][22]** take greater advantage of the JPEG and WebP shrink-on-load feature, which can lead to a slight moiré pattern on some images. (optional, default `true`)
+
+### Examples
+
+```javascript
+sharp(inputBuffer)
+  .resize(200, 300, {
+    kernel: sharp.kernel.nearest
+  })
+  .background('white')
+  .embed()
+  .toFile('output.tiff')
+  .then(function() {
+    // output.tiff is a 200 pixels wide and 300 pixels high image
+    // containing a nearest-neighbour scaled version, embedded on a white canvas,
+    // of the image data in inputBuffer
+  });
+```
+
+-   Throws **[Error][23]** Invalid parameters
+
+Returns **Sharp** 
+
+## crop
+
+Crop the resized image to the exact size specified, the default behaviour.
+
+Possible attributes of the optional `sharp.gravity` are `north`, `northeast`, `east`, `southeast`, `south`,
+`southwest`, `west`, `northwest`, `center` and `centre`.
+
+The experimental strategy-based approach resizes so one dimension is at its target length
+then repeatedly ranks edge regions, discarding the edge with the lowest score based on the selected strategy.
+
+-   `entropy`: focus on the region with the highest [Shannon entropy][24].
+-   `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
+
+### Parameters
+
+-   `crop` **[String][21]** A member of `sharp.gravity` to crop to an edge/corner or `sharp.strategy` to crop dynamically. (optional, default `'centre'`)
+
+### Examples
+
+```javascript
+const transformer = sharp()
+  .resize(200, 200)
+  .crop(sharp.strategy.entropy)
+  .on('error', function(err) {
+    console.log(err);
+  });
+// Read image data from readableStream
+// Write 200px square auto-cropped image data to writableStream
+readableStream.pipe(transformer).pipe(writableStream);
+```
+
+-   Throws **[Error][23]** Invalid parameters
+
+Returns **Sharp** 
+
+## embed
+
+Preserving aspect ratio, resize the image to the maximum `width` or `height` specified
+then embed on a background of the exact `width` and `height` specified.
+
+If the background contains an alpha value then WebP and PNG format output images will
+contain an alpha channel, even when the input image does not.
+
+### Parameters
+
+-   `embed` **[String][21]** A member of `sharp.gravity` to embed to an edge/corner. (optional, default `'centre'`)
+
+### Examples
+
+```javascript
+sharp('input.gif')
+  .resize(200, 300)
+  .background({r: 0, g: 0, b: 0, alpha: 0})
+  .embed()
+  .toFormat(sharp.format.webp)
+  .toBuffer(function(err, outputBuffer) {
+    if (err) {
+      throw err;
+    }
+    // outputBuffer contains WebP image data of a 200 pixels wide and 300 pixels high
+    // containing a scaled version, embedded on a transparent canvas, of input.gif
+  });
+```
+
+-   Throws **[Error][23]** Invalid parameters
+
+Returns **Sharp** 
+
+## max
+
+Preserving aspect ratio, resize the image to be as large as possible
+while ensuring its dimensions are less than or equal to the `width` and `height` specified.
+
+Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
+
+### Examples
+
+```javascript
+sharp(inputBuffer)
+  .resize(200, 200)
+  .max()
+  .toFormat('jpeg')
+  .toBuffer()
+  .then(function(outputBuffer) {
+    // outputBuffer contains JPEG image data no wider than 200 pixels and no higher
+    // than 200 pixels regardless of the inputBuffer image dimensions
+  });
+```
+
+Returns **Sharp** 
+
+## 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`.
+
+Returns **Sharp** 
+
+## ignoreAspectRatio
+
+Ignoring the aspect ratio of the input, stretch the image to
+the exact `width` and/or `height` provided via `resize`.
+
+Returns **Sharp** 
+
+## withoutEnlargement
+
+Do not enlarge the output image if the input image width _or_ height are already less than the required dimensions.
+This is equivalent to GraphicsMagick's `>` geometry option:
+"_change the dimensions of the image only if its width or height exceeds the geometry specification_".
+Use with `max()` to preserve the image's aspect ratio.
+
+The default behaviour _before_ function call is `false`, meaning the image will be enlarged.
+
+### Parameters
+
+-   `withoutEnlargement` **[Boolean][22]**  (optional, default `true`)
+
+Returns **Sharp** 
+
+[1]: #resize
+
+[2]: #parameters
+
+[3]: #examples
+
+[4]: #crop
+
+[5]: #parameters-1
+
+[6]: #examples-1
+
+[7]: #embed
+
+[8]: #parameters-2
+
+[9]: #examples-2
+
+[10]: #max
+
+[11]: #examples-3
+
+[12]: #min
+
+[13]: #ignoreaspectratio
+
+[14]: #withoutenlargement
+
+[15]: #parameters-3
+
+[16]: http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation
+
+[17]: https://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline
+
+[18]: https://en.wikipedia.org/wiki/Lanczos_resampling#Lanczos_kernel
+
+[19]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[20]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[21]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[22]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[23]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
+
+[24]: https://en.wikipedia.org/wiki/Entropy_%28information_theory%29

docs/api-utility.md

@@ -0,0 +1,141 @@
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+### Table of Contents
+
+-   [cache][1]
+    -   [Parameters][2]
+    -   [Examples][3]
+-   [concurrency][4]
+    -   [Parameters][5]
+    -   [Examples][6]
+-   [counters][7]
+    -   [Examples][8]
+-   [simd][9]
+    -   [Parameters][10]
+    -   [Examples][11]
+
+## cache
+
+Gets or, when options are provided, sets the limits of _libvips'_ operation cache.
+Existing entries in the cache will be trimmed after any change in limits.
+This method always returns cache statistics,
+useful for determining how much working memory is required for a particular task.
+
+### Parameters
+
+-   `options` **([Object][12] \| [Boolean][13])** Object with the following attributes, or Boolean where true uses default cache settings and false removes all caching (optional, default `true`)
+    -   `options.memory` **[Number][14]** is the maximum memory in MB to use for this cache (optional, default `50`)
+    -   `options.files` **[Number][14]** is the maximum number of files to hold open (optional, default `20`)
+    -   `options.items` **[Number][14]** is the maximum number of operations to cache (optional, default `100`)
+
+### Examples
+
+```javascript
+const stats = sharp.cache();
+```
+
+```javascript
+sharp.cache( { items: 200 } );
+sharp.cache( { files: 0 } );
+sharp.cache(false);
+```
+
+Returns **[Object][12]** 
+
+## concurrency
+
+Gets or, when a concurrency is provided, sets
+the number of threads _libvips'_ should create to process each image.
+The default value is the number of CPU cores.
+A value of `0` will reset to this default.
+
+The maximum number of images that can be processed in parallel
+is limited by libuv's `UV_THREADPOOL_SIZE` environment variable.
+
+This method always returns the current concurrency.
+
+### Parameters
+
+-   `concurrency` **[Number][14]?** 
+
+### Examples
+
+```javascript
+const threads = sharp.concurrency(); // 4
+sharp.concurrency(2); // 2
+sharp.concurrency(0); // 4
+```
+
+Returns **[Number][14]** concurrency
+
+## 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.
+
+### Examples
+
+```javascript
+const counters = sharp.counters(); // { queue: 2, process: 4 }
+```
+
+Returns **[Object][12]** 
+
+## simd
+
+Get and set use of SIMD vector unit instructions.
+Requires libvips to have been compiled with liborc support.
+
+Improves the performance of `resize`, `blur` and `sharpen` operations
+by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM NEON.
+
+This feature is currently off by default but future versions may reverse this.
+Versions of liborc prior to 0.4.25 are known to segfault under heavy load.
+
+### Parameters
+
+-   `simd` **[Boolean][13]**  (optional, default `false`)
+
+### Examples
+
+```javascript
+const simd = sharp.simd();
+// simd is `true` if SIMD is currently enabled
+```
+
+```javascript
+const simd = sharp.simd(true);
+// attempts to enable the use of SIMD, returning true if available
+```
+
+Returns **[Boolean][13]** 
+
+[1]: #cache
+
+[2]: #parameters
+
+[3]: #examples
+
+[4]: #concurrency
+
+[5]: #parameters-1
+
+[6]: #examples-1
+
+[7]: #counters
+
+[8]: #examples-2
+
+[9]: #simd
+
+[10]: #parameters-2
+
+[11]: #examples-3
+
+[12]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[13]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[14]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number

docs/api.md

@@ -1,838 +0,0 @@
-# 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 JPEG, PNG, WebP, GIF, SVG or TIFF image file.
-
-JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data
-can be streamed into the object when `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.
-When using Stream based output, derived attributes are available from the `info` event.
-
-```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
-  });
-```
-
-```javascript
-// Read image data from readableStream,
-// resize to 300 pixels wide,
-// emit an 'info' event with calculated dimensions
-// and finally write image data to writableStream
-var transformer = sharp()
-  .resize(300)
-  .on('info', function(info) {
-    console.log('Image height is ' + info.height);
-  });
-readableStream.pipe(transformer).pipe(writableStream);
-```
-
-#### 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 used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
-* `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#L568)
-* `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
-* `density`: Number of pixels per inch (DPI), if present
-* `hasProfile`: Boolean indicating the presence of an embedded ICC profile
-* `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
-* `orientation`: Number value of the EXIF Orientation header, if present
-* `exif`: Buffer containing raw EXIF data, if present
-* `icc`: Buffer containing raw [ICC](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 either an integral Number of pixels, with a value between 1 and the default 268402689 (0x3FFF * 0x3FFF) or
- a boolean. `false` will disable checking while `true` will revert to the default limit.
-
-### Resizing
-
-#### resize([width], [height], [options])
-
-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.
-
-`options` is an optional Object. If present, it can contain one or more of:
-
-* `options.kernel`, the kernel to use for image reduction, defaulting to `lanczos3`.
-* `options.interpolator`, the interpolator to use for image enlargement, defaulting to `bicubic`.
-
-Possible kernels are:
-
-* `cubic`: Use a [Catmull-Rom spline](https://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline).
-* `lanczos2`: Use a [Lanczos kernel](https://en.wikipedia.org/wiki/Lanczos_resampling#Lanczos_kernel) with `a=2`.
-* `lanczos3`: Use a Lanczos kernel with `a=3` (the default).
-
-Possible interpolators are:
-
-* `nearest`: Use [nearest neighbour interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation).
-* `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.
-
-```javascript
-sharp(inputBuffer)
-  .resize(200, 300, {
-    kernel: sharp.kernel.lanczos2,
-    interpolator: 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 lanczos2/nohalo scaled version, embedded on a white canvas,
-    // of the image data in inputBuffer
-  });
-```
-
-#### crop([option])
-
-Crop the resized image to the exact size specified, the default behaviour.
-
-`option`, if present, is an attribute of:
-
-* `sharp.gravity` e.g. `sharp.gravity.north`, to crop to an edge or corner, or
-* `sharp.strategy` e.g. `sharp.strategy.entropy`, to crop dynamically.
-
-Possible attributes of `sharp.gravity` are
-`north`, `northeast`, `east`, `southeast`, `south`,
-`southwest`, `west`, `northwest`, `center` and `centre`.
-
-The experimental strategy-based approach resizes so one dimension is at its target length
-then repeatedly ranks edge regions, discarding the edge with the lowest score based on the selected strategy.
-
-* `entropy`: focus on the region with the highest [Shannon entropy](https://en.wikipedia.org/wiki/Entropy_%28information_theory%29).
-* `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
-
-The default crop option is a `center`/`centre` gravity.
-
-```javascript
-var transformer = sharp()
-  .resize(200, 200)
-  .crop(sharp.strategy.entropy)
-  .on('error', function(err) {
-    console.log(err);
-  });
-// Read image data from readableStream
-// Write 200px square auto-cropped 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`.
-
-### 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
-  });
-```
-
-#### trim([tolerance])
-
-Trim "boring" pixels from all edges that contain values within a percentage similarity of the top-left pixel.
-
-* `tolerance`, if present, is an integral Number between 1 and 99 representing the percentage similarity, defaulting to 10.
-
-#### background(rgba)
-
-Set the background for the `embed`, `flatten` and `extend` 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`.
-
-#### extend(extension)
-
-Extends/pads the edges of the image with `background`, where `extension` is one of:
-
-* a Number representing the pixel count to add to each edge, or
-* an Object containing `top`, `left`, `bottom` and `right` attributes, each a Number of pixels to add to that edge.
-
-This operation will always occur after resizing and extraction, if any.
-
-```javascript
-// Resize to 140 pixels wide, then add 10 transparent pixels
-// to the top, left and right edges and 20 to the bottom edge
-sharp(input)
-  .resize(140)
-  .background({r: 0, g: 0, b: 0, a: 0})
-  .extend({top: 10, bottom: 20, left: 10, right: 10})
-  ...
-```
-
-#### 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 sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
-
-#### convolve(kernel)
-
-Convolve the image with the specified `kernel`, an Object with the following attributes:
-
-* `width` is an integral Number representing the width of the kernel in pixels.
-* `height` is an integral Number representing the width of the kernel in pixels.
-* `kernel` is an Array of length `width*height` containing the kernel values.
-* `scale`, if present, is a Number representing the scale of the kernel in pixels, defaulting to the sum of the kernel's values.
-* `offset`, if present, is a Number representing the offset of the kernel in pixels, defaulting to 0.
-
-```javascript
-sharp(input)
-  .convolve({
-    width: 3,
-    height: 3,
-    kernel: [-1, 0, 1, -2, 0, 2, -1, 0, 1]
-  })
-  .raw()
-  .toBuffer(function(err, data, info) {
-    // data contains the raw pixel data representing the convolution
-    // of the input image with the horizontal Sobel operator
-  });
-```
-
-#### sharpen([sigma], [flat], [jagged])
-
-When used without parameters, performs a fast, mild sharpen of the output image. This typically reduces performance by 10%.
-
-When a `sigma` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space. Separate control over the level of sharpening in "flat" and "jagged" areas is available. This typically reduces performance by 50%.
-
-* `sigma`, if present, is a Number representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
-* `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], [options])
-
-Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
-By default, the image will be converted to single channel greyscale before thresholding.
-
-* `threshold`, if present, is a Number between 0 and 255, representing the level at which the threshold will be applied. The default threshold is 128.
-* `options`, if present, is an Object containing a Boolean `greyscale` (or `grayscale`). When `false` each channel will have the threshold applied independently.
-
-#### 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.
-
-By default the output image will be web-friendly sRGB and contain three (identical) color channels. This may be overridden by other sharp operations such as `toColourspace('b-w')`, which will produce an output image containing one color channel. An alpha channel may be present, and will be unchanged by the operation.
-
-#### normalize() / normalise()
-
-Enhance output image contrast by stretching its luminance to cover the full dynamic range. This typically reduces performance by 30%.
-
-#### overlayWith(image, [options])
-
-Overlay (composite) a image over the processed (resized, extracted etc.) image.
-
-`image` is one of the following, and must be the same size or smaller than the processed image:
-
-* Buffer containing image data, or
-* String containing the path to an image file
-
-`options`, if present, is an Object with the following optional attributes:
-
-* `gravity` is a String or an attribute of the `sharp.gravity` Object e.g. `sharp.gravity.north` at which to place the overlay, defaulting to `center`/`centre`.
-* `top` is an integral Number representing the pixel offset from the top edge.
-* `left` is an integral Number representing the pixel offset from the left edge.
-* `tile` is a Boolean, defaulting to `false`. When set to `true` repeats the overlay image across the entire image with the given `gravity`.
-* `cutout` is a Boolean, defaulting to `false`. When set to `true` applies only the alpha channel of the overlay image to the image to be overlaid, giving the appearance of one image being cut out of another.
-* `raw` an Object containing `width`, `height` and `channels` when providing uncompressed data.
-
-If both `top` and `left` are provided, they take precedence over `gravity`.
-
-```javascript
-sharp('input.png')
-  .rotate(180)
-  .resize(300)
-  .flatten()
-  .background('#ff6600')
-  .overlayWith('overlay.png', { gravity: sharp.gravity.southeast } )
-  .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 with SE gravity,
-    // sharpened, with metadata, 90% quality WebP image data. Phew!
-  });
-```
-
-#### toColourspace(colourspace) / toColorspace(colorspace)
-
-Set the output colourspace. By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.  
-  
-`colourspace` is a string or `sharp.colourspace` enum that identifies an output colourspace. String arguments comprise vips colour space interpretation names  e.g. `srgb`, `rgb`, `scrgb`, `cmyk`, `lab`, `xyz`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568)
-  
-#### extractChannel(channel)
-
-Extract a single channel from a multi-channel image.
-
-`channel` is a zero-indexed integral Number representing the band number to extract. `red`, `green` or `blue` are also accepted as an alternative to `0`, `1` or `2` respectively.
-
-```javascript
-sharp(input)
-  .extractChannel('green')
-  .toFile('input_green.jpg', function(err, info) {
-    // info.channels === 1
-    // input_green.jpg contains the green channel of the input image
-   });
-```
-
-#### joinChannel(channels, [options])
-
-Join a data channel to the image. The meaning of the added channels depends on the output colourspace, set with `toColourspace()`. By default the output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
-
-`channels` is one of
-* a single file path
-* an array of file paths
-* a single buffer
-* an array of buffers
-
-Note that channel ordering follows vips convention:
-* sRGB: 0: Red, 1: Green, 2: Blue, 3: Alpha
-* CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha
-
-Buffers may be any of the image formats supported by sharp: JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data. In the case of a RAW buffer, the `options` object should contain a `raw` attribute, which follows the format of the attribute of the same name in the `sharp()` constructor. See `sharp()` for details. See `raw()` for pixel ordering. 
-
-#### bandbool(operation)
-
-Perform a bitwise boolean operation on all input image channels (bands) to produce a single channel output image.
-
-`operation` is a string containing the name of the bitwise operator to be appled to image channels, which can be one of:
-
-* `and` performs a bitwise and operation, like the c-operator `&`.
-* `or` performs a bitwise or operation, like the c-operator `|`.
-* `eor` performs a bitwise exclusive or operation, like the c-operator `^`.
-
-```javascript
-sharp('input.png')
-  .bandbool(sharp.bool.and)
-  .toFile('output.png')
-```
-
-In the above example if `input.png` is a 3 channel RGB image, `output.png` will be a 1 channel grayscale image where each pixel `P = R & G & B`.
-For example, if `I(1,1) = [247, 170, 14] = [0b11110111, 0b10101010, 0b00001111]` then `O(1,1) = 0b11110111 & 0b10101010 & 0b00001111 = 0b00000010 = 2`.
-
-#### boolean(image, operation, [options])
-
-Perform a bitwise boolean operation with `image`, where `image` is one of the following:
-
-* Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
-* String containing the path to an image file
-
-This operation creates an output image where each pixel is the result of the selected bitwise boolean `operation` between the corresponding pixels of the input images.
-The boolean operation can be one of the following:
-
-* `and` performs a bitwise and operation, like the c-operator `&`.
-* `or` performs a bitwise or operation, like the c-operator `|`.
-* `eor` performs a bitwise exclusive or operation, like the c-operator `^`.
-
-`options`, if present, is an Object with the following optional attributes:
-
-* `raw` an Object containing `width`, `height` and `channels` when providing uncompressed data.
-
-### 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, DZI, and VIPS V format supported. Note that RAW format is only supported for buffer output.
-
-`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, WebP, and RAW 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 1 and 8, 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(options)
-
-The size, overlap, container and directory layout to use when generating square Deep Zoom image pyramid tiles.
-
-`options` is an Object with one or more of the following attributes:
-
-* `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.
-* `container` is a String, with value `fs` or `zip`. The default value is `fs`.
-* `layout` is a String, with value `dz`, `zoomify` or `google`. The default value is `dz`.
-
-You can also use the file extension `.zip` or `.szi` to write to a compressed archive file format.
-
-```javascript
-sharp('input.tiff')
-  .tile({
-    size: 512
-  })
-  .toFile('output.dzi', function(err, info) {
-    // output.dzi is the Deep Zoom XML definition
-    // output_files contains 512x512 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 } },
-  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);
-```
-
-### 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.
-
-Existing entries in the cache will be trimmed after any change in limits.
-
-This method always returns cache statistics, useful for determining how much working memory is required for a particular task.
-
-```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

@@ -1,9 +1,316 @@
 # Changelog
 
+### v0.20 - "*prebuild*"
+
+Requires libvips v8.6.1.
+
+#### v0.20.4 - 20<sup>th</sup> June 2018
+
+* Prevent possible rounding error when using shrink-on-load and 90/270 degree rotation.
+  [#1241](https://github.com/lovell/sharp/issues/1241)
+  [@anahit42](https://github.com/anahit42)
+
+* Ensure extractChannel sets correct single-channel colour space interpretation.
+  [#1257](https://github.com/lovell/sharp/issues/1257)
+  [@jeremychone](https://github.com/jeremychone)
+
+#### v0.20.3 - 29<sup>th</sup> May 2018
+
+* Fix tint operation by ensuring LAB interpretation and allowing negative values.
+  [#1235](https://github.com/lovell/sharp/issues/1235)
+  [@wezside](https://github.com/wezside)
+
+#### v0.20.2 - 28<sup>th</sup> April 2018
+
+* Add tint operation to set image chroma.
+  [#825](https://github.com/lovell/sharp/pull/825)
+  [@rikh42](https://github.com/rikh42)
+
+* Add environment variable to ignore globally-installed libvips.
+  [#1165](https://github.com/lovell/sharp/pull/1165)
+  [@oncletom](https://github.com/oncletom)
+
+* Add support for page selection with multi-page input (GIF/TIFF).
+  [#1204](https://github.com/lovell/sharp/pull/1204)
+  [@woolite64](https://github.com/woolite64)
+
+* Add support for Group4 (CCITTFAX4) compression with TIFF output.
+  [#1208](https://github.com/lovell/sharp/pull/1208)
+  [@woolite64](https://github.com/woolite64)
+
+#### v0.20.1 - 17<sup>th</sup> March 2018
+
+* Improve installation experience when a globally-installed libvips below the minimum required version is found.
+  [#1148](https://github.com/lovell/sharp/issues/1148)
+
+* Prevent smartcrop error when cumulative rounding is below target size.
+  [#1154](https://github.com/lovell/sharp/issues/1154)
+  [@ralrom](https://github.com/ralrom)
+
+* Expose libvips' median filter operation.
+  [#1161](https://github.com/lovell/sharp/pull/1161)
+  [@BiancoA](https://github.com/BiancoA)
+
+#### v0.20.0 - 5<sup>th</sup> March 2018
+
+* Add support for prebuilt sharp binaries on common platforms.
+  [#186](https://github.com/lovell/sharp/issues/186)
+
+### v0.19 - "*suit*"
+
+Requires libvips v8.6.1.
+
+#### v0.19.1 - 24<sup>th</sup> February 2018
+
+* Expose libvips' linear transform feature.
+  [#1024](https://github.com/lovell/sharp/pull/1024)
+  [@3epnm](https://github.com/3epnm)
+
+* Expose angle option for tile-based output.
+  [#1121](https://github.com/lovell/sharp/pull/1121)
+  [@BiancoA](https://github.com/BiancoA)
+
+* Prevent crop operation when image already at or below target dimensions.
+  [#1134](https://github.com/lovell/sharp/issues/1134)
+  [@pieh](https://github.com/pieh)
+
+#### v0.19.0 - 11<sup>th</sup> January 2018
+
+* Expose offset coordinates of strategy-based crop.
+  [#868](https://github.com/lovell/sharp/issues/868)
+  [@mirohristov-com](https://github.com/mirohristov-com)
+
+* PNG output now defaults to adaptiveFiltering=false, compressionLevel=9
+  [#872](https://github.com/lovell/sharp/issues/872)
+  [@wmertens](https://github.com/wmertens)
+
+* Add stats feature for pixel-derived image statistics.
+  [#915](https://github.com/lovell/sharp/pull/915)
+  [@rnanwani](https://github.com/rnanwani)
+
+* Add failOnError option to fail-fast on bad input image data.
+  [#976](https://github.com/lovell/sharp/pull/976)
+  [@mceachen](https://github.com/mceachen)
+
+* Resize: switch to libvips' implementation, make fastShrinkOnLoad optional, remove interpolator and centreSampling options.
+  [#977](https://github.com/lovell/sharp/pull/977)
+  [@jardakotesovec](https://github.com/jardakotesovec)
+
+* Attach finish event listener to a clone only for Stream-based input.
+  [#995](https://github.com/lovell/sharp/issues/995)
+  [@whmountains](https://github.com/whmountains)
+
+* Add tilecache before smartcrop to avoid over-computation of previous operations.
+  [#1028](https://github.com/lovell/sharp/issues/1028)
+  [@coffeebite](https://github.com/coffeebite)
+
+* Prevent toFile extension taking precedence over requested format.
+  [#1037](https://github.com/lovell/sharp/issues/1037)
+  [@tomgallagher](https://github.com/tomgallagher)
+
+* Add support for gravity option to existing embed feature.
+  [#1038](https://github.com/lovell/sharp/pull/1038)
+  [@AzureByte](https://github.com/AzureByte)
+
+* Expose IPTC and XMP metadata when available.
+  [#1079](https://github.com/lovell/sharp/pull/1079)
+  [@oaleynik](https://github.com/oaleynik)
+
+* TIFF output: switch default predictor from 'none' to 'horizontal' to match libvips' behaviour.
+
+### v0.18 - "*ridge*"
+
+Requires libvips v8.5.5.
+
+#### v0.18.4 - 18<sup>th</sup> September 2017
+
+* Ensure input Buffer really is marked as Persistent, prevents mark-sweep GC.
+  [#950](https://github.com/lovell/sharp/issues/950)
+  [@lfdoherty](https://github.com/lfdoherty)
+
+#### v0.18.3 - 13<sup>th</sup> September 2017
+
+* Skip shrink-on-load when trimming.
+  [#888](https://github.com/lovell/sharp/pull/888)
+  [@kleisauke](https://github.com/kleisauke)
+
+* Migrate from got to simple-get for basic auth support.
+  [#945](https://github.com/lovell/sharp/pull/945)
+  [@pbomb](https://github.com/pbomb)
+
+#### v0.18.2 - 1<sup>st</sup> July 2017
+
+* Expose libvips' xres and yres properties for TIFF output.
+  [#828](https://github.com/lovell/sharp/pull/828)
+  [@YvesBos](https://github.com/YvesBos)
+
+* Ensure flip and flop operations work with auto-rotate.
+  [#837](https://github.com/lovell/sharp/issues/837)
+  [@rexxars](https://github.com/rexxars)
+
+* Allow binary download URL override via SHARP_DIST_BASE_URL env variable.
+  [#841](https://github.com/lovell/sharp/issues/841)
+
+* Add support for Solus Linux.
+  [#857](https://github.com/lovell/sharp/pull/857)
+  [@ekremkaraca](https://github.com/ekremkaraca)
+
+#### v0.18.1 - 30<sup>th</sup> May 2017
+
+* Remove regression from #781 that could cause incorrect shrink calculation.
+  [#831](https://github.com/lovell/sharp/issues/831)
+  [@suprMax](https://github.com/suprMax)
+
+#### v0.18.0 - 30<sup>th</sup> May 2017
+
+* Remove the previously-deprecated output format "option" functions:
+    quality, progressive, compressionLevel, withoutAdaptiveFiltering,
+    withoutChromaSubsampling, trellisQuantisation, trellisQuantization,
+    overshootDeringing, optimiseScans and optimizeScans.
+
+* Ensure maximum output dimensions are based on the format to be used.
+  [#176](https://github.com/lovell/sharp/issues/176)
+  [@stephanebachelier](https://github.com/stephanebachelier)
+
+* Avoid costly (un)premultiply when using overlayWith without alpha channel.
+  [#573](https://github.com/lovell/sharp/issues/573)
+  [@strarsis](https://github.com/strarsis)
+
+* Include pixel depth (e.g. "uchar") when reading metadata.
+  [#577](https://github.com/lovell/sharp/issues/577)
+  [@moedusa](https://github.com/moedusa)
+
+* Add support for Buffer and Stream-based TIFF output.
+  [#587](https://github.com/lovell/sharp/issues/587)
+  [@strarsis](https://github.com/strarsis)
+
+* Expose warnings from libvips via NODE_DEBUG=sharp environment variable.
+  [#607](https://github.com/lovell/sharp/issues/607)
+  [@puzrin](https://github.com/puzrin)
+
+* Switch to the libvips implementation of "attention" and "entropy" crop strategies.
+  [#727](https://github.com/lovell/sharp/issues/727)
+
+* Improve performance and accuracy of nearest neighbour integral upsampling.
+  [#752](https://github.com/lovell/sharp/issues/752)
+  [@MrIbby](https://github.com/MrIbby)
+
+* Constructor single argument API: allow plain object, reject null/undefined.
+  [#768](https://github.com/lovell/sharp/issues/768)
+  [@kub1x](https://github.com/kub1x)
+
+* Ensure ARM64 pre-built binaries use correct C++11 ABI version.
+  [#772](https://github.com/lovell/sharp/issues/772)
+  [@ajiratech2](https://github.com/ajiratech2)
+
+* Prevent aliasing by using dynamic values for shrink(-on-load).
+  [#781](https://github.com/lovell/sharp/issues/781)
+  [@kleisauke](https://github.com/kleisauke)
+
+* Expose libvips' "squash" parameter to enable 1-bit TIFF output.
+  [#783](https://github.com/lovell/sharp/pull/783)
+  [@YvesBos](https://github.com/YvesBos)
+
+* Add support for rotation using any multiple of +/-90 degrees.
+  [#791](https://github.com/lovell/sharp/pull/791)
+  [@ncoden](https://github.com/ncoden)
+
+* Add "jpg" alias to toFormat as shortened form of "jpeg".
+  [#814](https://github.com/lovell/sharp/pull/814)
+  [@jingsam](https://github.com/jingsam)
+
+### v0.17 - "*quill*"
+
+Requires libvips v8.4.2.
+
+#### v0.17.3 - 1<sup>st</sup> April 2017
+
+* Allow toBuffer to optionally resolve a Promise with both info and data.
+  [#143](https://github.com/lovell/sharp/issues/143)
+  [@salzhrani](https://github.com/salzhrani)
+
+* Create blank image of given width, height, channels and background.
+  [#470](https://github.com/lovell/sharp/issues/470)
+  [@pjarts](https://github.com/pjarts)
+
+* Add support for the "nearest" kernel for image reductions.
+  [#732](https://github.com/lovell/sharp/pull/732)
+  [@alice0meta](https://github.com/alice0meta)
+
+* Add support for TIFF compression and predictor options.
+  [#738](https://github.com/lovell/sharp/pull/738)
+  [@kristojorg](https://github.com/kristojorg)
+
+#### v0.17.2 - 11<sup>th</sup> February 2017
+
+* Ensure Readable side of Stream can start flowing after Writable side has finished.
+  [#671](https://github.com/lovell/sharp/issues/671)
+  [@danhaller](https://github.com/danhaller)
+
+* Expose WebP alpha quality, lossless and near-lossless output options.
+  [#685](https://github.com/lovell/sharp/pull/685)
+  [@rnanwani](https://github.com/rnanwani)
+
+#### v0.17.1 - 15<sup>th</sup> January 2017
+
+* Improve error messages for invalid parameters.
+  [@spikeon](https://github.com/spikeon)
+  [#644](https://github.com/lovell/sharp/pull/644)
+
+* Simplify expression for finding vips-cpp libdir.
+  [#656](https://github.com/lovell/sharp/pull/656)
+
+* Allow HTTPS-over-HTTP proxy when downloading pre-compiled dependencies.
+  [@wangzhiwei1888](https://github.com/wangzhiwei1888)
+  [#679](https://github.com/lovell/sharp/issues/679)
+
+#### v0.17.0 - 11<sup>th</sup> December 2016
+
+* Drop support for versions of Node prior to v4.
+
+* Deprecate the following output format "option" functions:
+    quality, progressive, compressionLevel, withoutAdaptiveFiltering,
+    withoutChromaSubsampling, trellisQuantisation, trellisQuantization,
+    overshootDeringing, optimiseScans and optimizeScans.
+  Access to these is now via output format functions, for example `quality(n)`
+    is now `jpeg({quality: n})` and/or `webp({quality: n})`.
+
+* Autoconvert GIF and SVG input to PNG output if no other format is specified.
+
+* Expose libvips' "centre" resize option to mimic \*magick's +0.5px convention.
+  [#568](https://github.com/lovell/sharp/issues/568)
+
+* Ensure support for embedded base64 PNG and JPEG images within an SVG.
+  [#601](https://github.com/lovell/sharp/issues/601)
+  [@dynamite-ready](https://github.com/dynamite-ready)
+
+* Ensure premultiply operation occurs before box filter shrink.
+  [#605](https://github.com/lovell/sharp/issues/605)
+  [@CmdrShepardsPie](https://github.com/CmdrShepardsPie)
+  [@teroparvinen](https://github.com/teroparvinen)
+
+* Add support for PNG and WebP tile-based output formats (in addition to JPEG).
+  [#622](https://github.com/lovell/sharp/pull/622)
+  [@ppaskaris](https://github.com/ppaskaris)
+
+* Allow use of extend with greyscale input.
+  [#623](https://github.com/lovell/sharp/pull/623)
+  [@ppaskaris](https://github.com/ppaskaris)
+
+* Allow non-RGB input to embed/extend onto background with an alpha channel.
+  [#646](https://github.com/lovell/sharp/issues/646)
+  [@DaGaMs](https://github.com/DaGaMs)
+
 ### v0.16 - "*pencil*"
 
 Requires libvips v8.3.3
 
+#### v0.16.2 - 22<sup>nd</sup> October 2016
+
+* Restrict readelf usage to Linux only when detecting global libvips version.
+  [#602](https://github.com/lovell/sharp/issues/602)
+  [@caoko](https://github.com/caoko)
+
 #### v0.16.1 - 13<sup>th</sup> October 2016
 
 * C++11 ABI version is now auto-detected, remove sharp-cxx11 installation flag.

docs/index.md

@@ -13,8 +13,9 @@ Lanczos resampling ensures quality is not sacrificed for speed.
 As well as image resizing, operations such as
 rotation, extraction, compositing and gamma correction are available.
 
-OS X, Windows (x64), Linux (x64, ARM) systems do not require
-the installation of any external runtime dependencies.
+Most 64-bit OS X, Windows and Linux (glibc) systems running
+Node versions 4, 6, 8 and 10
+do not require any additional install or runtime dependencies.
 
 [![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.png?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)
 
@@ -22,7 +23,7 @@ the installation of any external runtime dependencies.
 
 This module supports reading JPEG, PNG, WebP, TIFF, GIF and SVG images.
 
-Output images can be in JPEG, PNG and WebP formats as well as uncompressed raw pixel data.
+Output images can be in JPEG, PNG, WebP and TIFF formats as well as uncompressed raw pixel data.
 
 Streams, Buffer objects and the filesystem can be used for input and output.
 
@@ -46,7 +47,7 @@ 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.
+no child processes are spawned and Promises/async/await are supported.
 
 ### Optimal
 
@@ -55,9 +56,9 @@ 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,
+PNG filtering is disabled by default,
 which for diagrams and line art often produces the same result
-as [pngcrush](http://pmt.sourceforge.net/pngcrush/).
+as [pngcrush](https://pmt.sourceforge.io/pngcrush/).
 
 ### Contributing
 
@@ -94,12 +95,29 @@ the help and code contributions of the following people:
 * [Kleis Auke Wolthuizen](https://github.com/kleisauke)
 * [Matt Hirsch](https://github.com/mhirsch)
 * [Rahul Nanwani](https://github.com/rnanwani)
+* [Matthias Thoemmes](https://github.com/cmtt)
+* [Patrick Paskaris](https://github.com/ppaskaris)
+* [Jérémy Lal](https://github.com/kapouer)
+* [Alice Monday](https://github.com/alice0meta)
+* [Kristo Jorgenson](https://github.com/kristojorg)
+* [Yves Bos](https://github.com/YvesBos)
+* [Nicolas Coden](https://github.com/ncoden)
+* [Matt Parrish](https://github.com/pbomb)
+* [Matthew McEachen](https://github.com/mceachen)
+* [Jarda Kotěšovec](https://github.com/jardakotesovec)
+* [Kenric D'Souza](https://github.com/AzureByte)
+* [Oleh Aleinyk](https://github.com/oaleynik)
+* [Marcel Bretschneider](https://github.com/3epnm)
+* [Andrea Bianco](https://github.com/BiancoA)
+* [Rik Heywood](https://github.com/rikh42)
+* [Thomas Parisot](https://github.com/oncletom)
+* [Nathan Graves](https://github.com/woolite64)
 
 Thank you!
 
 ### Licence
 
-Copyright 2013, 2014, 2015, 2016 Lovell Fuller and contributors.
+Copyright 2013, 2014, 2015, 2016, 2017, 2018 Lovell Fuller and contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

docs/install.md

@@ -4,61 +4,86 @@
 npm install sharp
 ```
 
-### Prerequisites
+```sh
+yarn add sharp
+```
+
+## Prerequisites
+
+* Node v4.5.0+
+
+### Building from source
+
+Pre-compiled binaries for sharp are provided for use with
+Node versions 4, 6, 8 and 10 on
+64-bit Windows, OS X and Linux platforms.
+
+Sharp will be built from source at install time when:
+
+* a globally-installed libvips is detected,
+* pre-compiled binaries do not exist for the current platform and Node version, or
+* when the `npm install --build-from-source` flag is used.
+
+Building from source requires:
 
 * C++11 compatible compiler such as gcc 4.8+, clang 3.0+ or MSVC 2013+
-* [node-gyp](https://github.com/TooTallNate/node-gyp#installation) and its dependencies
+* [node-gyp](https://github.com/TooTallNate/node-gyp#installation) and its dependencies (includes Python)
+
+## libvips
 
 ### 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)
+[![Ubuntu 16.04 Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)
 
-libvips and its dependencies are fetched and stored within `node_modules/sharp/lib` during `npm install`.
-This involves an automated HTTPS download of approximately 6.5MB.
+libvips and its dependencies are fetched and stored within `node_modules/sharp/vendor` during `npm install`.
+This involves an automated HTTPS download of approximately 7MB.
 
 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, 16.04
-* Centos 7
-* Fedora 23, 24
-* openSUSE 13.2
+* Debian 7+
+* Ubuntu 14.04+
+* Centos 7+
+* Fedora
+* openSUSE 13.2+
 * Archlinux
 * Raspbian Jessie
-* Amazon Linux 2016.03, 2016.09
+* Amazon Linux
+* Solus
 
 To use a globally-installed version of libvips instead of the provided binaries,
 make sure it is at least the version listed under `config.libvips` in the `package.json` file
 and that it can be located using `pkg-config --modversion vips-cpp`.
 
-If you are using non-stadard paths (anything other than `/usr` or `/usr/local`),
+If you are using non-standard paths (anything other than `/usr` or `/usr/local`),
 you might need to set `PKG_CONFIG_PATH` during `npm install`
 and `LD_LIBRARY_PATH` at runtime.
 
 This allows the use of newer versions of libvips with older versions of sharp.
 
 For 32-bit Intel CPUs and older Linux-based operating systems such as Centos 6,
-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`):
+it is recommended to install a system-wide installation of libvips from source:
+
+https://jcupitt.github.io/libvips/install.html#building-libvips-from-a-source-tarball
+
+#### Alpine Linux
+
+libvips is available in the
+[testing repository](https://pkgs.alpinelinux.org/packages?name=vips-dev):
 
 ```sh
-# WARNING: This script is deprecated. You probably don't need to run it. Please read above.
-curl -s https://raw.githubusercontent.com/lovell/sharp/master/preinstall.sh | sudo bash -
+apk add vips-dev fftw-dev --update-cache --repository https://dl-3.alpinelinux.org/alpine/edge/testing/
 ```
 
-For Linux-based operating systems such as Alpine that use musl libc,
-the smaller stack size means libvips' cache should be disabled
+The smaller stack size of musl libc means
+libvips may need to be used without a cache
 via `sharp.cache(false)` to avoid a stack overflow.
 
 ### Mac OS
 
-[![OS X 10.9.5 Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)
+[![OS X 10.12 Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)
 
-libvips and its dependencies are fetched and stored within `node_modules/sharp/lib` during `npm install`.
-This involves an automated HTTPS download of approximately 6.5MB.
+libvips and its dependencies are fetched and stored within `node_modules/sharp/vendor` during `npm install`.
+This involves an automated HTTPS download of approximately 7MB.
 
 To use your own version of libvips instead of the provided binaries, make sure it is
 at least the version listed under `config.libvips` in the `package.json` file and
@@ -68,25 +93,35 @@ that it can be located using `pkg-config --modversion vips-cpp`.
 
 [![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.
+libvips and its dependencies are fetched and stored within `node_modules\sharp\vendor` during `npm install`.
+This involves an automated HTTPS download of approximately 12MB.
 
 Only 64-bit (x64) `node.exe` is supported.
 
 ### FreeBSD
 
 libvips must be installed before `npm install` is run.
-This can be achieved via [FreshPorts](https://www.freshports.org/graphics/vips/):
+
+This can be achieved via package or ports:
+
+```sh
+pkg install -y pkgconf vips
+```
 
 ```sh
 cd /usr/ports/graphics/vips/ && make install clean
 ```
 
+FreeBSD's gcc v4 and v5 need `CXXFLAGS=-D_GLIBCXX_USE_C99` set for C++11 support due to
+https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193528
+
 ### Heroku
 
-[Alessandro Tagliapietra](https://github.com/alex88) maintains an
-[Heroku buildpack for libvips](https://github.com/alex88/heroku-buildpack-vips)
-and its dependencies.
+libvips and its dependencies are fetched and stored within `node_modules\sharp\vendor` during `npm install`.
+This involves an automated HTTPS download of approximately 7MB.
+
+Set [NODE_MODULES_CACHE](https://devcenter.heroku.com/articles/nodejs-support#cache-behavior)
+to `false` when using the `yarn` package manager.
 
 ### Docker
 
@@ -104,38 +139,53 @@ docker pull marcbachmann/libvips
 docker pull wjordan/libvips
 ```
 
+[Tailor Brands](https://github.com/TailorBrands) maintain
+[Debian-based Dockerfiles for libvips and nodejs](https://github.com/TailorBrands/docker-libvips).
+
+```sh
+docker pull tailor/docker-libvips
+```
+
 ### AWS Lambda
 
-In order to use sharp on AWS Lambda, you need to [create a deployment package](http://docs.aws.amazon.com/lambda/latest/dg/nodejs-create-deployment-pkg.html). Because sharp
-downloads and links libraries for the current platform during `npm install` you have to
-do this on a system similar to the [Lambda Execution Environment](http://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html). The easiest ways to do this, is to setup a
-small t2.micro instance using the AMI ID listed in the previous link, ssh into it as ec2-user
-and follow the instructions below.
-
-Install dependencies:
+A [deployment package](http://docs.aws.amazon.com/lambda/latest/dg/nodejs-create-deployment-pkg.html) for the
+[Lambda Execution Environment](http://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html)
+can be built using Docker.
 
 ```sh
-curl -s https://rpm.nodesource.com/setup_4.x | sudo bash -
-sudo yum install -y gcc-c++ nodejs
+rm -rf node_modules/sharp
+docker run -v "$PWD":/var/task lambci/lambda:build-nodejs6.10 npm install
 ```
 
-Copy your code and package.json to the instance using `scp` and create a deployment package:
+Set the Lambda runtime to Node.js 6.10.
+
+To get the best performance select the largest memory available. A 1536 MB function provides ~12x more CPU time than a 128 MB function.
+
+### NW.js
+
+Run the `nw-gyp` tool after installation.
 
 ```sh
-cd sharp-lambda-example
-npm install
-zip -ur9 ../sharp-lambda-example.zip index.js node_modules
+cd node-modules/sharp
+nw-gyp rebuild --arch=x64 --target=[your nw version]
+node node_modules/sharp/install/dll-copy
 ```
 
-You can now download your deployment ZIP using `scp` and upload it to Lambda. Be sure to set your Lambda runtime to Node.js 4.3.
-
-**Performance Tip:** To get the best performance on Lambda choose the largest memory available because this also gives you the most cpu time (a 1536 MB function is 12x faster than a 128 MB function).
+See also http://docs.nwjs.io/en/latest/For%20Users/Advanced/Use%20Native%20Node%20Modules/
 
 ### Build tools
 
 * [gulp-responsive](https://www.npmjs.com/package/gulp-responsive)
 * [grunt-sharp](https://www.npmjs.com/package/grunt-sharp)
 
+### Coding tools
+
+* [Sharp TypeScript Types](https://www.npmjs.com/package/@types/sharp)
+
+### CLI tools
+
+* [sharp-cli](https://www.npmjs.com/package/sharp-cli)
+
 ### Security
 
 Many users of this module process untrusted, user-supplied images,
@@ -171,15 +221,33 @@ configuration file to prevent the use of coders known to be vulnerable.
 Set the `MAGICK_CONFIGURE_PATH` environment variable
 to the directory containing the `policy.xml` file.
 
-### Licences
+### Pre-compiled libvips binaries
 
-If a global installation of libvips that meets the
-minimum version requirement cannot be found,
-this module will download a pre-compiled bundle of libvips
-and its dependencies on Linux and Windows machines.
+This module will attempt to download a pre-compiled bundle of libvips
+and its dependencies on Linux and Windows machines under either of these
+conditions:
+
+1. If a global installation of libvips that meets the
+minimum version requirement cannot be found;
+1. If `SHARP_IGNORE_GLOBAL_LIBVIPS` environment variable is set.
+
+```sh
+SHARP_IGNORE_GLOBAL_LIBVIPS=1 npm install sharp
+```
 
 Should you need to manually download and inspect these files,
-you can do so via https://dl.bintray.com/lovell/sharp/
+you can do so via https://github.com/lovell/sharp-libvips/releases
+
+Should you wish to install these from your own location,
+set the `SHARP_DIST_BASE_URL` environment variable, e.g.
+
+```sh
+SHARP_DIST_BASE_URL="https://hostname/path/" npm install sharp
+```
+
+to use `https://hostname/path/libvips-x.y.z-platform.tar.gz`.
+
+### Licences
 
 This module is licensed under the terms of the
 [Apache 2.0 Licence](https://github.com/lovell/sharp/blob/master/LICENSE).
@@ -194,6 +262,7 @@ Use of libraries under the terms of the LGPLv3 is via the
 | Library       | Used under the terms of                                                                                  |
 |---------------|----------------------------------------------------------------------------------------------------------|
 | cairo         | Mozilla Public License 2.0                                                                               |
+| expat         | MIT Licence                                                                                              |
 | fontconfig    | [fontconfig Licence](https://cgit.freedesktop.org/fontconfig/tree/COPYING) (BSD-like)                    |
 | freetype      | [freetype Licence](http://git.savannah.gnu.org/cgit/freetype/freetype2.git/tree/docs/FTL.TXT) (BSD-like) |
 | giflib        | MIT Licence                                                                                              |

docs/performance.md

@@ -2,42 +2,44 @@
 
 ### Test environment
 
-* AWS EC2 [c4.xlarge](http://aws.amazon.com/ec2/instance-types/#c4) (4x E5-2666 v3 @ 2.90GHz)
-* Amazon Linux AMI 2016.03.1 (HVM), SSD Volume Type
-* Node.js v6.2.0
+* AWS EC2 eu-west-1 [c5.large](https://aws.amazon.com/ec2/instance-types/c5/) (2x Xeon Platinum 8124M CPU @ 3.00GHz)
+* Ubuntu 17.10 (hvm:ebs-ssd, 20180102, ami-0741d47e)
+* Node.js v8.9.4
 
 ### The contenders
 
-* [jimp](https://www.npmjs.com/package/jimp) v0.2.24 - Image processing in pure JavaScript. Bilinear interpolation only.
-* [lwip](https://www.npmjs.com/package/lwip) v0.0.9 - Wrapper around CImg, compiles dependencies from source.
-* [imagemagick-native](https://www.npmjs.com/package/imagemagick-native) v1.9.2 - Wrapper around libmagick++, supports Buffers only.
+* [jimp](https://www.npmjs.com/package/jimp) v0.2.28 - Image processing in pure JavaScript. Bilinear interpolation only.
+* [pajk-lwip](https://www.npmjs.com/package/pajk-lwip) v0.2.0 (fork) - Wrapper around CImg that compiles dependencies from source.
+* [mapnik](https://www.npmjs.org/package/mapnik) v3.6.2 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities.
+* [imagemagick-native](https://www.npmjs.com/package/imagemagick-native) v1.9.3 - Wrapper around libmagick++, supports Buffers only.
 * [imagemagick](https://www.npmjs.com/package/imagemagick) v0.1.3 - Supports filesystem only and "*has been unmaintained for a long time*".
-* [gm](https://www.npmjs.com/package/gm) v1.22.0 - Fully featured wrapper around GraphicsMagick's `gm` command line utility.
-* sharp v0.15.0 / libvips v8.3.1 - Caching within libvips disabled to ensure a fair comparison.
+* [gm](https://www.npmjs.com/package/gm) v1.23.1 - Fully featured wrapper around GraphicsMagick's `gm` command line utility.
+* [images](https://www.npmjs.com/package/images) v3.0.1 - Compiles dependencies from source. Provides bicubic interpolation.
+* sharp v0.19.0 / libvips v8.6.1 - Caching within libvips disabled to ensure a fair comparison.
 
 ### The task
 
 Decompress a 2725x2225 JPEG image,
-resize to 720x480 using Lanczos 3 resampling (where available),
-then compress to JPEG.
+resize to 720x588 using Lanczos 3 resampling (where available),
+then compress to JPEG at a "quality" setting of 80.
 
 ### Results
 
 | Module             | Input  | Output | Ops/sec | Speed-up |
 | :----------------- | :----- | :----- | ------: | -------: |
-| jimp (bilinear)    | file   | file   |    0.94 |      1.0 |
-| jimp (bilinear)    | buffer | buffer |    0.98 |      1.0 |
-| lwip               | file   | file   |    1.14 |      1.2 |
-| lwip               | buffer | buffer |    1.14 |      1.2 |
-| imagemagick-native | buffer | buffer |    1.66 |      1.8 |
-| imagemagick        | file   | file   |    5.08 |      5.4 |
-| gm                 | buffer | buffer |    5.43 |      5.7 |
-| gm                 | file   | file   |    5.46 |      5.8 |
-| sharp              | stream | stream |   26.52 |     28.2 |
-| sharp              | file   | file   |   28.16 |     30.0 |
-| sharp              | file   | buffer |   28.27 |     30.1 |
-| sharp              | buffer | file   |   28.42 |     30.2 |
-| sharp              | buffer | buffer |   28.42 |     30.2 |
+| jimp (bilinear)    | buffer | buffer |    1.14 |      1.0 |
+| lwip               | buffer | buffer |    1.86 |      1.6 |
+| mapnik             | buffer | buffer |    3.34 |      2.9 |
+| imagemagick-native | buffer | buffer |    4.13 |      3.6 |
+| gm                 | buffer | buffer |    4.21 |      3.7 |
+| gm                 | file   | file   |    4.27 |      3.7 |
+| imagemagick        | file   | file   |    4.67 |      4.1 |
+| images (bicubic)   | file   | file   |    6.22 |      5.5 |
+| sharp              | stream | stream |   24.43 |     21.4 |
+| sharp              | file   | file   |   25.97 |     22.7 |
+| sharp              | file   | buffer |   26.00 |     22.8 |
+| sharp              | buffer | file   |   26.33 |     23.0 |
+| sharp              | buffer | buffer |   26.43 |     23.1 |
 
 Greater libvips performance can be expected with caching enabled (default)
 and using 8+ core machines, especially those with larger L1/L2 CPU caches.
@@ -46,19 +48,20 @@ The I/O limits of the relevant (de)compression library will generally determine
 
 ### Benchmark test prerequisites
 
-Requires both _ImageMagick_ and _GraphicsMagick_:
+Requires _ImageMagick_, _GraphicsMagick_ and _Mapnik_:
 
 ```sh
 brew install imagemagick
 brew install graphicsmagick
+brew install mapnik
 ```
 
 ```sh
-sudo apt-get install imagemagick libmagick++-dev graphicsmagick
+sudo apt-get install imagemagick libmagick++-dev graphicsmagick mapnik-dev
 ```
 
 ```sh
-sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick
+sudo yum install ImageMagick-devel ImageMagick-c++-devel GraphicsMagick mapnik-devel
 ```
 
 ### Running the benchmark test

install/dll-copy.js

@@ -0,0 +1,34 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+
+const copyFileSync = require('fs-copy-file-sync');
+const npmLog = require('npmlog');
+
+if (process.platform === 'win32') {
+  const buildDir = path.join(__dirname, '..', 'build');
+  const buildReleaseDir = path.join(buildDir, 'Release');
+  npmLog.info('sharp', `Creating ${buildReleaseDir}`);
+  try {
+    fs.mkdirSync(buildDir);
+    fs.mkdirSync(buildReleaseDir);
+  } catch (err) {}
+  const vendorLibDir = path.join(__dirname, '..', 'vendor', 'lib');
+  npmLog.info('sharp', `Copying DLLs from ${vendorLibDir} to ${buildReleaseDir}`);
+  try {
+    fs
+      .readdirSync(vendorLibDir)
+      .filter(function (filename) {
+        return /\.dll$/.test(filename);
+      })
+      .forEach(function (filename) {
+        copyFileSync(
+          path.join(vendorLibDir, filename),
+          path.join(buildReleaseDir, filename)
+        );
+      });
+  } catch (err) {
+    npmLog.error('sharp', err.message);
+  }
+}

install/libvips.js

@@ -0,0 +1,82 @@
+'use strict';
+
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+
+const detectLibc = require('detect-libc');
+const npmLog = require('npmlog');
+const semver = require('semver');
+const simpleGet = require('simple-get');
+const tar = require('tar');
+
+const agent = require('../lib/agent');
+const libvips = require('../lib/libvips');
+const platform = require('../lib/platform');
+
+const minimumLibvipsVersion = libvips.minimumLibvipsVersion;
+const distBaseUrl = process.env.SHARP_DIST_BASE_URL || `https://github.com/lovell/sharp-libvips/releases/download/v${minimumLibvipsVersion}/`;
+
+try {
+  const useGlobalLibvips = libvips.useGlobalLibvips();
+  if (useGlobalLibvips) {
+    const globalLibvipsVersion = libvips.globalLibvipsVersion();
+    npmLog.info('sharp', `Detected globally-installed libvips v${globalLibvipsVersion}`);
+    npmLog.info('sharp', 'Building from source via node-gyp');
+    process.exit(1);
+  } else if (libvips.hasVendoredLibvips()) {
+    npmLog.info('sharp', `Using existing vendored libvips v${minimumLibvipsVersion}`);
+  } else {
+    // Is this arch/platform supported?
+    const arch = process.env.npm_config_arch || process.arch;
+    if (platform() === 'win32-ia32') {
+      throw new Error('Windows x86 (32-bit) node.exe is not supported');
+    }
+    if (arch === 'ia32') {
+      throw new Error(`Intel Architecture 32-bit systems require manual installation of libvips >= ${minimumLibvipsVersion}\n`);
+    }
+    if (detectLibc.isNonGlibcLinux) {
+      throw new Error(`Use with ${detectLibc.family} libc requires manual installation of libvips >= ${minimumLibvipsVersion}`);
+    }
+    if (detectLibc.family === detectLibc.GLIBC && detectLibc.version && semver.lt(`${detectLibc.version}.0`, '2.13.0')) {
+      throw new Error(`Use with glibc version ${detectLibc.version} requires manual installation of libvips >= ${minimumLibvipsVersion}`);
+    }
+    // Download to per-process temporary file
+    const tarFilename = ['libvips', minimumLibvipsVersion, platform()].join('-') + '.tar.gz';
+    const tarPathTemp = path.join(os.tmpdir(), `${process.pid}-${tarFilename}`);
+    const tmpFile = fs.createWriteStream(tarPathTemp);
+    const url = distBaseUrl + tarFilename;
+    npmLog.info('sharp', `Downloading ${url}`);
+    simpleGet({ url: url, agent: agent() }, function (err, response) {
+      if (err) {
+        throw err;
+      }
+      if (response.statusCode !== 200) {
+        throw new Error(`Status ${response.statusCode}`);
+      }
+      response.pipe(tmpFile);
+    });
+    tmpFile.on('close', function () {
+      const vendorPath = path.join(__dirname, '..', 'vendor');
+      fs.mkdirSync(vendorPath);
+      tar
+        .extract({
+          file: tarPathTemp,
+          cwd: vendorPath,
+          strict: true
+        })
+        .then(function () {
+          try {
+            fs.unlinkSync(tarPathTemp);
+          } catch (err) {}
+        })
+        .catch(function (err) {
+          throw err;
+        });
+    });
+  }
+} catch (err) {
+  npmLog.error('sharp', err.message);
+  npmLog.error('sharp', 'Please see http://sharp.pixelplumbing.com/page/install');
+  process.exit(1);
+}

lib/agent.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const url = require('url');
+const tunnelAgent = require('tunnel-agent');
+
+const is = require('./is');
+
+const proxies = [
+  'HTTPS_PROXY',
+  'https_proxy',
+  'HTTP_PROXY',
+  'http_proxy',
+  'npm_config_https_proxy',
+  'npm_config_proxy'
+];
+
+function env (key) {
+  return process.env[key];
+}
+
+module.exports = function () {
+  try {
+    const proxy = url.parse(proxies.map(env).find(is.string));
+    const tunnel = proxy.protocol === 'https:'
+      ? tunnelAgent.httpsOverHttps
+      : tunnelAgent.httpsOverHttp;
+    return tunnel({
+      proxy: {
+        port: Number(proxy.port),
+        host: proxy.hostname,
+        proxyAuth: proxy.auth
+      }
+    });
+  } catch (err) {
+    return null;
+  }
+};

lib/channel.js

@@ -0,0 +1,113 @@
+'use strict';
+
+const is = require('./is');
+
+/**
+ * Boolean operations for bandbool.
+ * @private
+ */
+const bool = {
+  and: 'and',
+  or: 'or',
+  eor: 'eor'
+};
+
+/**
+ * Extract a single channel from a multi-channel image.
+ *
+ * @example
+ * sharp(input)
+ *   .extractChannel('green')
+ *   .toFile('input_green.jpg', function(err, info) {
+ *     // info.channels === 1
+ *     // input_green.jpg contains the green channel of the input image
+ *    });
+ *
+ * @param {Number|String} channel - zero-indexed band number to extract, or `red`, `green` or `blue` as alternative to `0`, `1` or `2` respectively.
+ * @returns {Sharp}
+ * @throws {Error} Invalid channel
+ */
+function extractChannel (channel) {
+  if (channel === 'red') {
+    channel = 0;
+  } else if (channel === 'green') {
+    channel = 1;
+  } else if (channel === 'blue') {
+    channel = 2;
+  }
+  if (is.integer(channel) && is.inRange(channel, 0, 4)) {
+    this.options.extractChannel = channel;
+  } else {
+    throw new Error('Cannot extract invalid channel ' + channel);
+  }
+  return this;
+}
+
+/**
+ * Join one or more channels to the image.
+ * The meaning of the added channels depends on the output colourspace, set with `toColourspace()`.
+ * By default the output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
+ * Channel ordering follows vips convention:
+ * - sRGB: 0: Red, 1: Green, 2: Blue, 3: Alpha.
+ * - CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha.
+ *
+ * Buffers may be any of the image formats supported by sharp: JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data.
+ * For raw pixel input, the `options` object should contain a `raw` attribute, which follows the format of the attribute of the same name in the `sharp()` constructor.
+ *
+ * @param {Array<String|Buffer>|String|Buffer} images - one or more images (file paths, Buffers).
+ * @param {Object} options - image options, see `sharp()` constructor.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function joinChannel (images, options) {
+  if (Array.isArray(images)) {
+    images.forEach(function (image) {
+      this.options.joinChannelIn.push(this._createInputDescriptor(image, options));
+    }, this);
+  } else {
+    this.options.joinChannelIn.push(this._createInputDescriptor(images, options));
+  }
+  return this;
+}
+
+/**
+ * Perform a bitwise boolean operation on all input image channels (bands) to produce a single channel output image.
+ *
+ * @example
+ * sharp('3-channel-rgb-input.png')
+ *   .bandbool(sharp.bool.and)
+ *   .toFile('1-channel-output.png', function (err, info) {
+ *     // The output will be a single channel image where each pixel `P = R & G & B`.
+ *     // If `I(1,1) = [247, 170, 14] = [0b11110111, 0b10101010, 0b00001111]`
+ *     // then `O(1,1) = 0b11110111 & 0b10101010 & 0b00001111 = 0b00000010 = 2`.
+ *   });
+ *
+ * @param {String} boolOp - one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function bandbool (boolOp) {
+  if (is.string(boolOp) && is.inArray(boolOp, ['and', 'or', 'eor'])) {
+    this.options.bandBoolOp = boolOp;
+  } else {
+    throw new Error('Invalid bandbool operation ' + boolOp);
+  }
+  return this;
+}
+
+/**
+ * Decorate the Sharp prototype with channel-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  // Public instance functions
+  [
+    extractChannel,
+    joinChannel,
+    bandbool
+  ].forEach(function (f) {
+    Sharp.prototype[f.name] = f;
+  });
+  // Class attributes
+  Sharp.bool = bool;
+};

lib/colour.js

@@ -0,0 +1,124 @@
+'use strict';
+
+const color = require('color');
+const is = require('./is');
+
+/**
+ * Colourspaces.
+ * @private
+ */
+const colourspace = {
+  multiband: 'multiband',
+  'b-w': 'b-w',
+  bw: 'b-w',
+  cmyk: 'cmyk',
+  srgb: 'srgb'
+};
+
+/**
+ * Set the background for the `embed`, `flatten` and `extend` operations.
+ * The default background is `{r: 0, g: 0, b: 0, alpha: 1}`, black without transparency.
+ *
+ * Delegates to the _color_ module, which can throw an Error
+ * but is liberal in what it accepts, clipping values to sensible min/max.
+ * The alpha value is a float between `0` (transparent) and `1` (opaque).
+ *
+ * @param {String|Object} rgba - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameter
+ */
+function background (rgba) {
+  const colour = color(rgba);
+  this.options.background = [
+    colour.red(),
+    colour.green(),
+    colour.blue(),
+    Math.round(colour.alpha() * 255)
+  ];
+  return this;
+}
+
+/**
+ * Tint the image using the provided chroma while preserving the image luminance.
+ * An alpha channel may be present and will be unchanged by the operation.
+ *
+ * @param {String|Object} rgb - parsed by the [color](https://www.npmjs.org/package/color) module to extract chroma values.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameter
+ */
+function tint (rgb) {
+  const colour = color(rgb);
+  this.options.tintA = colour.a();
+  this.options.tintB = colour.b();
+  return this;
+}
+
+/**
+ * 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.
+ * By default the output image will be web-friendly sRGB and contain three (identical) color channels.
+ * This may be overridden by other sharp operations such as `toColourspace('b-w')`,
+ * which will produce an output image containing one color channel.
+ * An alpha channel may be present, and will be unchanged by the operation.
+ * @param {Boolean} [greyscale=true]
+ * @returns {Sharp}
+ */
+function greyscale (greyscale) {
+  this.options.greyscale = is.bool(greyscale) ? greyscale : true;
+  return this;
+}
+
+/**
+ * Alternative spelling of `greyscale`.
+ * @param {Boolean} [grayscale=true]
+ * @returns {Sharp}
+ */
+function grayscale (grayscale) {
+  return this.greyscale(grayscale);
+}
+
+/**
+ * Set the output colourspace.
+ * By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
+ * @param {String} [colourspace] - output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568)
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function toColourspace (colourspace) {
+  if (!is.string(colourspace)) {
+    throw new Error('Invalid output colourspace ' + colourspace);
+  }
+  this.options.colourspace = colourspace;
+  return this;
+}
+
+/**
+ * Alternative spelling of `toColourspace`.
+ * @param {String} [colorspace] - output colorspace.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function toColorspace (colorspace) {
+  return this.toColourspace(colorspace);
+}
+
+/**
+ * Decorate the Sharp prototype with colour-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  // Public instance functions
+  [
+    background,
+    tint,
+    greyscale,
+    grayscale,
+    toColourspace,
+    toColorspace
+  ].forEach(function (f) {
+    Sharp.prototype[f.name] = f;
+  });
+  // Class attributes
+  Sharp.colourspace = colourspace;
+  Sharp.colorspace = colourspace;
+};

lib/composite.js

@@ -0,0 +1,97 @@
+'use strict';
+
+const is = require('./is');
+
+/**
+ * Overlay (composite) an image over the processed (resized, extracted etc.) image.
+ *
+ * The overlay image must be the same size or smaller than the processed image.
+ * If both `top` and `left` options are provided, they take precedence over `gravity`.
+ *
+ * If the overlay image contains an alpha channel then composition with premultiplication will occur.
+ *
+ * @example
+ * sharp('input.png')
+ *   .rotate(180)
+ *   .resize(300)
+ *   .flatten()
+ *   .background('#ff6600')
+ *   .overlayWith('overlay.png', { gravity: sharp.gravity.southeast } )
+ *   .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 with SE gravity,
+ *     // sharpened, with metadata, 90% quality WebP image data. Phew!
+ *   });
+ *
+ * @param {(Buffer|String)} overlay - Buffer containing image data or String containing the path to an image file.
+ * @param {Object} [options]
+ * @param {String} [options.gravity='centre'] - gravity at which to place the overlay.
+ * @param {Number} [options.top] - the pixel offset from the top edge.
+ * @param {Number} [options.left] - the pixel offset from the left edge.
+ * @param {Boolean} [options.tile=false] - set to true to repeat the overlay image across the entire image with the given `gravity`.
+ * @param {Boolean} [options.cutout=false] - set to true to apply only the alpha channel of the overlay image to the input image, giving the appearance of one image being cut out of another.
+ * @param {Number} [options.density=72] - integral number representing the DPI for vector overlay image.
+ * @param {Object} [options.raw] - describes overlay when using raw pixel data.
+ * @param {Number} [options.raw.width]
+ * @param {Number} [options.raw.height]
+ * @param {Number} [options.raw.channels]
+ * @param {Object} [options.create] - describes a blank overlay to be created.
+ * @param {Number} [options.create.width]
+ * @param {Number} [options.create.height]
+ * @param {Number} [options.create.channels] - 3-4
+ * @param {String|Object} [options.create.background] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function overlayWith (overlay, options) {
+  this.options.overlay = this._createInputDescriptor(overlay, options, {
+    allowStream: false
+  });
+  if (is.object(options)) {
+    if (is.defined(options.tile)) {
+      if (is.bool(options.tile)) {
+        this.options.overlayTile = options.tile;
+      } else {
+        throw new Error('Invalid overlay tile ' + options.tile);
+      }
+    }
+    if (is.defined(options.cutout)) {
+      if (is.bool(options.cutout)) {
+        this.options.overlayCutout = options.cutout;
+      } else {
+        throw new Error('Invalid overlay cutout ' + options.cutout);
+      }
+    }
+    if (is.defined(options.left) || is.defined(options.top)) {
+      if (is.integer(options.left) && options.left >= 0 && is.integer(options.top) && options.top >= 0) {
+        this.options.overlayXOffset = options.left;
+        this.options.overlayYOffset = options.top;
+      } else {
+        throw new Error('Invalid overlay left ' + options.left + ' and/or top ' + options.top);
+      }
+    }
+    if (is.defined(options.gravity)) {
+      if (is.integer(options.gravity) && is.inRange(options.gravity, 0, 8)) {
+        this.options.overlayGravity = options.gravity;
+      } else if (is.string(options.gravity) && is.integer(this.constructor.gravity[options.gravity])) {
+        this.options.overlayGravity = this.constructor.gravity[options.gravity];
+      } else {
+        throw new Error('Unsupported overlay gravity ' + options.gravity);
+      }
+    }
+  }
+  return this;
+}
+
+/**
+ * Decorate the Sharp prototype with composite-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  Sharp.prototype.overlayWith = overlayWith;
+};

lib/constructor.js

@@ -0,0 +1,257 @@
+'use strict';
+
+const path = require('path');
+const util = require('util');
+const stream = require('stream');
+const events = require('events');
+const semver = require('semver');
+const is = require('./is');
+const platform = require('./platform');
+const sharp = require('../build/Release/sharp.node');
+
+// Vendor platform
+(function () {
+  let vendorPlatformId;
+  try {
+    vendorPlatformId = require('../vendor/platform.json');
+  } catch (err) {
+    return;
+  }
+  const currentPlatformId = platform();
+  /* istanbul ignore if */
+  if (currentPlatformId !== vendorPlatformId) {
+    throw new Error(`'${vendorPlatformId}' binaries cannot be used on the '${currentPlatformId}' platform. Please remove the 'node_modules/sharp/vendor' directory and run 'npm rebuild'.`);
+  }
+})();
+
+// Versioning
+let versions = {
+  vips: sharp.libvipsVersion()
+};
+(function () {
+  // Does libvips meet minimum requirement?
+  const libvipsVersionMin = require('../package.json').config.libvips;
+  /* istanbul ignore if */
+  if (semver.lt(versions.vips, libvipsVersionMin)) {
+    throw new Error('Found libvips ' + versions.vips + ' but require at least ' + libvipsVersionMin);
+  }
+  // Include versions of dependencies, if present
+  try {
+    versions = require('../vendor/versions.json');
+  } catch (err) {}
+})();
+
+// Use NODE_DEBUG=sharp to enable libvips warnings
+const debuglog = util.debuglog('sharp');
+
+/**
+ * @class Sharp
+ *
+ * Constructor factory to create an instance of `sharp`, to which further methods are chained.
+ *
+ * JPEG, PNG, WebP or TIFF format image data can be streamed out from this object.
+ * When using Stream based output, derived attributes are available from the `info` event.
+ *
+ * Implements the [stream.Duplex](http://nodejs.org/api/stream.html#stream_class_stream_duplex) class.
+ *
+ * @example
+ * 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
+ *   });
+ *
+ * @example
+ * // Read image data from readableStream,
+ * // resize to 300 pixels wide,
+ * // emit an 'info' event with calculated dimensions
+ * // and finally write image data to writableStream
+ * var transformer = sharp()
+ *   .resize(300)
+ *   .on('info', function(info) {
+ *     console.log('Image height is ' + info.height);
+ *   });
+ * readableStream.pipe(transformer).pipe(writableStream);
+ *
+ * @example
+ * // Create a blank 300x200 PNG image of semi-transluent red pixels
+ * sharp({
+ *   create: {
+ *     width: 300,
+ *     height: 200,
+ *     channels: 4,
+ *     background: { r: 255, g: 0, b: 0, alpha: 128 }
+ *   }
+ * })
+ * .png()
+ * .toBuffer()
+ * .then( ... );
+ *
+ * @param {(Buffer|String)} [input] - if present, can be
+ *  a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
+ *  a String containing the path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file.
+ *  JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
+ * @param {Object} [options] - if present, is an Object with optional attributes.
+ * @param {Boolean} [options.failOnError=false] - by default apply a "best effort"
+ *  to decode images, even if the data is corrupt or invalid. Set this flag to true
+ *  if you'd rather halt processing and raise an error when loading invalid images.
+ * @param {Number} [options.density=72] - integral number representing the DPI for vector images.
+ * @param {Number} [options.page=0] - page number to extract for multi-page input (GIF, TIFF)
+ * @param {Object} [options.raw] - describes raw pixel input image data. See `raw()` for pixel ordering.
+ * @param {Number} [options.raw.width]
+ * @param {Number} [options.raw.height]
+ * @param {Number} [options.raw.channels] - 1-4
+ * @param {Object} [options.create] - describes a new image to be created.
+ * @param {Number} [options.create.width]
+ * @param {Number} [options.create.height]
+ * @param {Number} [options.create.channels] - 3-4
+ * @param {String|Object} [options.create.background] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+const Sharp = function (input, options) {
+  if (arguments.length === 1 && !is.defined(input)) {
+    throw new Error('Invalid input');
+  }
+  if (!(this instanceof Sharp)) {
+    return new Sharp(input, options);
+  }
+  stream.Duplex.call(this);
+  this.options = {
+    // input options
+    sequentialRead: false,
+    limitInputPixels: Math.pow(0x3FFF, 2),
+    // ICC profiles
+    iccProfilePath: path.join(__dirname, 'icc') + path.sep,
+    // resize options
+    topOffsetPre: -1,
+    leftOffsetPre: -1,
+    widthPre: -1,
+    heightPre: -1,
+    topOffsetPost: -1,
+    leftOffsetPost: -1,
+    widthPost: -1,
+    heightPost: -1,
+    width: -1,
+    height: -1,
+    canvas: 'crop',
+    crop: 0,
+    embed: 0,
+    useExifOrientation: false,
+    angle: 0,
+    rotateBeforePreExtract: false,
+    flip: false,
+    flop: false,
+    extendTop: 0,
+    extendBottom: 0,
+    extendLeft: 0,
+    extendRight: 0,
+    withoutEnlargement: false,
+    kernel: 'lanczos3',
+    fastShrinkOnLoad: true,
+    // operations
+    background: [0, 0, 0, 255],
+    tintA: 128,
+    tintB: 128,
+    flatten: false,
+    negate: false,
+    medianSize: 0,
+    blurSigma: 0,
+    sharpenSigma: 0,
+    sharpenFlat: 1,
+    sharpenJagged: 2,
+    threshold: 0,
+    thresholdGrayscale: true,
+    trimTolerance: 0,
+    gamma: 0,
+    greyscale: false,
+    normalise: 0,
+    booleanBufferIn: null,
+    booleanFileIn: '',
+    joinChannelIn: [],
+    extractChannel: -1,
+    colourspace: 'srgb',
+    // overlay
+    overlayGravity: 0,
+    overlayXOffset: -1,
+    overlayYOffset: -1,
+    overlayTile: false,
+    overlayCutout: false,
+    // output
+    fileOut: '',
+    formatOut: 'input',
+    streamOut: false,
+    withMetadata: false,
+    withMetadataOrientation: -1,
+    resolveWithObject: false,
+    // output format
+    jpegQuality: 80,
+    jpegProgressive: false,
+    jpegChromaSubsampling: '4:2:0',
+    jpegTrellisQuantisation: false,
+    jpegOvershootDeringing: false,
+    jpegOptimiseScans: false,
+    pngProgressive: false,
+    pngCompressionLevel: 9,
+    pngAdaptiveFiltering: false,
+    webpQuality: 80,
+    webpAlphaQuality: 100,
+    webpLossless: false,
+    webpNearLossless: false,
+    tiffQuality: 80,
+    tiffCompression: 'jpeg',
+    tiffPredictor: 'horizontal',
+    tiffSquash: false,
+    tiffXres: 1.0,
+    tiffYres: 1.0,
+    tileSize: 256,
+    tileOverlap: 0,
+    linearA: 1,
+    linearB: 0,
+    // Function to notify of libvips warnings
+    debuglog: debuglog,
+    // Function to notify of queue length changes
+    queueListener: function (queueLength) {
+      queue.emit('change', queueLength);
+    }
+  };
+  this.options.input = this._createInputDescriptor(input, options, { allowStream: true });
+  return this;
+};
+util.inherits(Sharp, stream.Duplex);
+
+/**
+ * An EventEmitter that emits a `change` event when a task is either:
+ * - queued, waiting for _libuv_ to provide a worker thread
+ * - complete
+ * @member
+ * @example
+ * sharp.queue.on('change', function(queueLength) {
+ *   console.log('Queue contains ' + queueLength + ' task(s)');
+ * });
+ */
+const queue = new events.EventEmitter();
+Sharp.queue = queue;
+
+/**
+ * An Object containing nested boolean values representing the available input and output formats/methods.
+ * @example
+ * console.log(sharp.format);
+ * @returns {Object}
+ */
+Sharp.format = sharp.format();
+
+/**
+ * An Object containing the version numbers of libvips and its dependencies.
+ * @member
+ * @example
+ * console.log(sharp.versions);
+ */
+Sharp.versions = versions;
+
+/**
+ * Export constructor.
+ * @private
+ */
+module.exports = Sharp;

lib/index.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const Sharp = require('./constructor');
+require('./input')(Sharp);
+require('./resize')(Sharp);
+require('./composite')(Sharp);
+require('./operation')(Sharp);
+require('./colour')(Sharp);
+require('./channel')(Sharp);
+require('./output')(Sharp);
+require('./utility')(Sharp);
+
+module.exports = Sharp;

lib/input.js

@@ -0,0 +1,376 @@
+'use strict';
+
+const color = require('color');
+const is = require('./is');
+const sharp = require('../build/Release/sharp.node');
+
+/**
+ * Create Object containing input and input-related options.
+ * @private
+ */
+function _createInputDescriptor (input, inputOptions, containerOptions) {
+  const inputDescriptor = { failOnError: false };
+  if (is.string(input)) {
+    // filesystem
+    inputDescriptor.file = input;
+  } else if (is.buffer(input)) {
+    // Buffer
+    inputDescriptor.buffer = input;
+  } else if (is.plainObject(input) && !is.defined(inputOptions)) {
+    // Plain Object descriptor, e.g. create
+    inputOptions = input;
+  } else if (!is.defined(input) && is.object(containerOptions) && containerOptions.allowStream) {
+    // Stream
+    inputDescriptor.buffer = [];
+  } else {
+    throw new Error('Unsupported input ' + typeof input);
+  }
+  if (is.object(inputOptions)) {
+    // Fail on error
+    if (is.defined(inputOptions.failOnError)) {
+      if (is.bool(inputOptions.failOnError)) {
+        inputDescriptor.failOnError = inputOptions.failOnError;
+      } else {
+        throw new Error('Invalid failOnError (boolean) ' + inputOptions.failOnError);
+      }
+    }
+    // Density
+    if (is.defined(inputOptions.density)) {
+      if (is.integer(inputOptions.density) && is.inRange(inputOptions.density, 1, 2400)) {
+        inputDescriptor.density = inputOptions.density;
+      } else {
+        throw new Error('Invalid density (1 to 2400) ' + inputOptions.density);
+      }
+    }
+    // Raw pixel input
+    if (is.defined(inputOptions.raw)) {
+      if (
+        is.object(inputOptions.raw) &&
+        is.integer(inputOptions.raw.width) && inputOptions.raw.width > 0 &&
+        is.integer(inputOptions.raw.height) && inputOptions.raw.height > 0 &&
+        is.integer(inputOptions.raw.channels) && is.inRange(inputOptions.raw.channels, 1, 4)
+      ) {
+        inputDescriptor.rawWidth = inputOptions.raw.width;
+        inputDescriptor.rawHeight = inputOptions.raw.height;
+        inputDescriptor.rawChannels = inputOptions.raw.channels;
+      } else {
+        throw new Error('Expected width, height and channels for raw pixel input');
+      }
+    }
+    // Page input for multi-page TIFF
+    if (is.defined(inputOptions.page)) {
+      if (is.integer(inputOptions.page) && is.inRange(inputOptions.page, 0, 100000)) {
+        inputDescriptor.page = inputOptions.page;
+      }
+    }
+    // Create new image
+    if (is.defined(inputOptions.create)) {
+      if (
+        is.object(inputOptions.create) &&
+        is.integer(inputOptions.create.width) && inputOptions.create.width > 0 &&
+        is.integer(inputOptions.create.height) && inputOptions.create.height > 0 &&
+        is.integer(inputOptions.create.channels) && is.inRange(inputOptions.create.channels, 3, 4) &&
+        is.defined(inputOptions.create.background)
+      ) {
+        inputDescriptor.createWidth = inputOptions.create.width;
+        inputDescriptor.createHeight = inputOptions.create.height;
+        inputDescriptor.createChannels = inputOptions.create.channels;
+        const background = color(inputOptions.create.background);
+        inputDescriptor.createBackground = [
+          background.red(),
+          background.green(),
+          background.blue(),
+          Math.round(background.alpha() * 255)
+        ];
+        delete inputDescriptor.buffer;
+      } else {
+        throw new Error('Expected width, height, channels and background to create a new input image');
+      }
+    }
+  } else if (is.defined(inputOptions)) {
+    throw new Error('Invalid input options ' + inputOptions);
+  }
+  return inputDescriptor;
+}
+
+/**
+ * Handle incoming Buffer chunk on Writable Stream.
+ * @private
+ * @param {Buffer} chunk
+ * @param {String} encoding - unused
+ * @param {Function} callback
+ */
+function _write (chunk, encoding, callback) {
+  /* istanbul ignore else */
+  if (Array.isArray(this.options.input.buffer)) {
+    /* istanbul ignore else */
+    if (is.buffer(chunk)) {
+      if (this.options.input.buffer.length === 0) {
+        const that = this;
+        this.on('finish', function () {
+          that.streamInFinished = true;
+        });
+      }
+      this.options.input.buffer.push(chunk);
+      callback();
+    } else {
+      callback(new Error('Non-Buffer data on Writable Stream'));
+    }
+  } else {
+    callback(new Error('Unexpected data on Writable Stream'));
+  }
+}
+
+/**
+ * Flattens the array of chunks accumulated in input.buffer.
+ * @private
+ */
+function _flattenBufferIn () {
+  if (this._isStreamInput()) {
+    this.options.input.buffer = Buffer.concat(this.options.input.buffer);
+  }
+}
+
+/**
+ * Are we expecting Stream-based input?
+ * @private
+ * @returns {Boolean}
+ */
+function _isStreamInput () {
+  return Array.isArray(this.options.input.buffer);
+}
+
+/**
+ * Take a "snapshot" of the Sharp instance, returning a new instance.
+ * Cloned instances inherit the input of their parent instance.
+ * This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream.
+ *
+ * @example
+ * const 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
+ *
+ * @returns {Sharp}
+ */
+function clone () {
+  const that = this;
+  // Clone existing options
+  const clone = this.constructor.call();
+  clone.options = Object.assign({}, this.options);
+  // Pass 'finish' event to clone for Stream-based input
+  if (this._isStreamInput()) {
+    this.on('finish', function () {
+      // Clone inherits input data
+      that._flattenBufferIn();
+      clone.options.bufferIn = that.options.bufferIn;
+      clone.emit('finish');
+    });
+  }
+  return clone;
+}
+
+/**
+ * Fast access to (uncached) image metadata without decoding any compressed image data.
+ * A Promises/A+ promise is returned when `callback` is not provided.
+ *
+ * - `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
+ * - `width`: Number of pixels wide (EXIF orientation is not taken into consideration)
+ * - `height`: Number of pixels high (EXIF orientation is not taken into consideration)
+ * - `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L636)
+ * - `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
+ * - `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L672)
+ * - `density`: Number of pixels per inch (DPI), if present
+ * - `hasProfile`: Boolean indicating the presence of an embedded ICC profile
+ * - `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
+ * - `orientation`: Number value of the EXIF Orientation header, if present
+ * - `exif`: Buffer containing raw EXIF data, if present
+ * - `icc`: Buffer containing raw [ICC](https://www.npmjs.com/package/icc) profile data, if present
+ * - `iptc`: Buffer containing raw IPTC data, if present
+ * - `xmp`: Buffer containing raw XMP data, if present
+ *
+ * @example
+ * const 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
+ *   });
+ *
+ * @param {Function} [callback] - called with the arguments `(err, metadata)`
+ * @returns {Promise<Object>|Sharp}
+ */
+function metadata (callback) {
+  const that = this;
+  if (is.fn(callback)) {
+    if (this._isStreamInput()) {
+      this.on('finish', function () {
+        that._flattenBufferIn();
+        sharp.metadata(that.options, callback);
+      });
+    } else {
+      sharp.metadata(this.options, callback);
+    }
+    return this;
+  } else {
+    if (this._isStreamInput()) {
+      return new Promise(function (resolve, reject) {
+        that.on('finish', function () {
+          that._flattenBufferIn();
+          sharp.metadata(that.options, function (err, metadata) {
+            if (err) {
+              reject(err);
+            } else {
+              resolve(metadata);
+            }
+          });
+        });
+      });
+    } else {
+      return new Promise(function (resolve, reject) {
+        sharp.metadata(that.options, function (err, metadata) {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(metadata);
+          }
+        });
+      });
+    }
+  }
+}
+
+/**
+ * Access to pixel-derived image statistics for every channel in the image.
+ * A Promise is returned when `callback` is not provided.
+ *
+ * - `channels`: Array of channel statistics for each channel in the image. Each channel statistic contains
+ *     - `min` (minimum value in the channel)
+ *     - `max` (maximum value in the channel)
+ *     - `sum` (sum of all values in a channel)
+ *     - `squaresSum` (sum of squared values in a channel)
+ *     - `mean` (mean of the values in a channel)
+ *     - `stdev` (standard deviation for the values in a channel)
+ *     - `minX` (x-coordinate of one of the pixel where the minimum lies)
+ *     - `minY` (y-coordinate of one of the pixel where the minimum lies)
+ *     - `maxX` (x-coordinate of one of the pixel where the maximum lies)
+ *     - `maxY` (y-coordinate of one of the pixel where the maximum lies)
+ * - `isOpaque`: Value to identify if the image is opaque or transparent, based on the presence and use of alpha channel
+ *
+ * @example
+ * const image = sharp(inputJpg);
+ * image
+ *   .stats()
+ *   .then(function(stats) {
+ *      // stats contains the channel-wise statistics array and the isOpaque value
+ *   });
+ *
+ * @param {Function} [callback] - called with the arguments `(err, stats)`
+ * @returns {Promise<Object>}
+ */
+function stats (callback) {
+  const that = this;
+  if (is.fn(callback)) {
+    if (this._isStreamInput()) {
+      this.on('finish', function () {
+        that._flattenBufferIn();
+        sharp.stats(that.options, callback);
+      });
+    } else {
+      sharp.stats(this.options, callback);
+    }
+    return this;
+  } else {
+    if (this._isStreamInput()) {
+      return new Promise(function (resolve, reject) {
+        that.on('finish', function () {
+          that._flattenBufferIn();
+          sharp.stats(that.options, function (err, stats) {
+            if (err) {
+              reject(err);
+            } else {
+              resolve(stats);
+            }
+          });
+        });
+      });
+    } else {
+      return new Promise(function (resolve, reject) {
+        sharp.stats(that.options, function (err, stats) {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(stats);
+          }
+        });
+      });
+    }
+  }
+}
+
+/**
+ * Do not process input images where the number of pixels (width * height) exceeds this limit.
+ * Assumes image dimensions contained in the input metadata can be trusted.
+ * The default limit is 268402689 (0x3FFF * 0x3FFF) pixels.
+ * @param {(Number|Boolean)} limit - an integral Number of pixels, zero or false to remove limit, true to use default limit.
+ * @returns {Sharp}
+ * @throws {Error} Invalid limit
+*/
+function limitInputPixels (limit) {
+  // if we pass in false we represent the integer as 0 to disable
+  if (limit === false) {
+    limit = 0;
+  } else if (limit === true) {
+    limit = Math.pow(0x3FFF, 2);
+  }
+  if (is.integer(limit) && limit >= 0) {
+    this.options.limitInputPixels = limit;
+  } else {
+    throw is.invalidParameterError('limitInputPixels', 'integer', limit);
+  }
+  return this;
+}
+
+/**
+ * An advanced setting that switches the libvips access method to `VIPS_ACCESS_SEQUENTIAL`.
+ * This will reduce memory usage and can improve performance on some systems.
+ *
+ * The default behaviour *before* function call is `false`, meaning the libvips access method is not sequential.
+ *
+ * @param {Boolean} [sequentialRead=true]
+ * @returns {Sharp}
+ */
+function sequentialRead (sequentialRead) {
+  this.options.sequentialRead = is.bool(sequentialRead) ? sequentialRead : true;
+  return this;
+}
+
+/**
+ * Decorate the Sharp prototype with input-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  [
+    // Private
+    _createInputDescriptor,
+    _write,
+    _flattenBufferIn,
+    _isStreamInput,
+    // Public
+    clone,
+    metadata,
+    stats,
+    limitInputPixels,
+    sequentialRead
+  ].forEach(function (f) {
+    Sharp.prototype[f.name] = f;
+  });
+};

lib/is.js

@@ -0,0 +1,119 @@
+'use strict';
+
+/**
+ * Is this value defined and not null?
+ * @private
+ */
+const defined = function (val) {
+  return typeof val !== 'undefined' && val !== null;
+};
+
+/**
+ * Is this value an object?
+ * @private
+ */
+const object = function (val) {
+  return typeof val === 'object';
+};
+
+/**
+ * Is this value a plain object?
+ * @private
+ */
+const plainObject = function (val) {
+  return object(val) && Object.prototype.toString.call(val) === '[object Object]';
+};
+
+/**
+ * Is this value a function?
+ * @private
+ */
+const fn = function (val) {
+  return typeof val === 'function';
+};
+
+/**
+ * Is this value a boolean?
+ * @private
+ */
+const bool = function (val) {
+  return typeof val === 'boolean';
+};
+
+/**
+ * Is this value a Buffer object?
+ * @private
+ */
+const buffer = function (val) {
+  return object(val) && val instanceof Buffer;
+};
+
+/**
+ * Is this value a non-empty string?
+ * @private
+ */
+const string = function (val) {
+  return typeof val === 'string' && val.length > 0;
+};
+
+/**
+ * Is this value a real number?
+ * @private
+ */
+const number = function (val) {
+  return typeof val === 'number' && !Number.isNaN(val);
+};
+
+/**
+ * Is this value an integer?
+ * @private
+ */
+const integer = function (val) {
+  return number(val) && val % 1 === 0;
+};
+
+/**
+ * Is this value within an inclusive given range?
+ * @private
+ */
+const inRange = function (val, min, max) {
+  return val >= min && val <= max;
+};
+
+/**
+ * Is this value within the elements of an array?
+ * @private
+ */
+const inArray = function (val, list) {
+  return list.indexOf(val) !== -1;
+};
+
+/**
+ * Create an Error with a message relating to an invalid parameter.
+ *
+ * @param {String} name - parameter name.
+ * @param {String} expected - description of the type/value/range expected.
+ * @param {*} actual - the value received.
+ * @returns {Error} Containing the formatted message.
+ * @private
+ */
+const invalidParameterError = function (name, expected, actual) {
+  return new Error(
+    `Expected ${expected} for ${name} but received ${actual} of type ${typeof actual}`
+  );
+};
+
+module.exports = {
+  defined: defined,
+  object: object,
+  plainObject: plainObject,
+  fn: fn,
+  bool: bool,
+  buffer: buffer,
+  string: string,
+  number: number,
+  integer: integer,
+  inRange: inRange,
+  inArray: inArray,
+  invalidParameterError: invalidParameterError
+};

lib/libvips.js

@@ -0,0 +1,63 @@
+'use strict';
+
+const path = require('path');
+const spawnSync = require('child_process').spawnSync;
+const semver = require('semver');
+const platform = require('./platform');
+
+const minimumLibvipsVersion = process.env.npm_package_config_libvips || require('../package.json').config.libvips;
+
+const spawnSyncOptions = {
+  encoding: 'utf8',
+  shell: true
+};
+
+const globalLibvipsVersion = function () {
+  if (process.platform !== 'win32') {
+    const globalLibvipsVersion = spawnSync(`PKG_CONFIG_PATH="${pkgConfigPath()}" pkg-config --modversion vips-cpp`, spawnSyncOptions).stdout || '';
+    return globalLibvipsVersion.trim();
+  } else {
+    return '';
+  }
+};
+
+const hasVendoredLibvips = function () {
+  const currentPlatformId = platform();
+  try {
+    const vendorPlatformId = require(path.join(__dirname, '..', 'vendor', 'platform.json'));
+    if (currentPlatformId === vendorPlatformId) {
+      return true;
+    } else {
+      throw new Error(`'${vendorPlatformId}' binaries cannot be used on the '${currentPlatformId}' platform. Please remove the 'node_modules/sharp/vendor' directory and run 'npm install'.`);
+    }
+  } catch (err) {}
+  return false;
+};
+
+const pkgConfigPath = function () {
+  if (process.platform !== 'win32') {
+    const brewPkgConfigPath = spawnSync('which brew >/dev/null 2>&1 && eval $(brew --env) && echo $PKG_CONFIG_LIBDIR', spawnSyncOptions).stdout || '';
+    return [brewPkgConfigPath.trim(), process.env.PKG_CONFIG_PATH, '/usr/local/lib/pkgconfig', '/usr/lib/pkgconfig']
+      .filter(function (p) { return !!p; })
+      .join(':');
+  } else {
+    return '';
+  }
+};
+
+const useGlobalLibvips = function () {
+  if (Boolean(process.env.SHARP_IGNORE_GLOBAL_LIBVIPS) === true) {
+    return false;
+  }
+
+  const globalVipsVersion = globalLibvipsVersion();
+  return !!globalVipsVersion && semver.gte(globalVipsVersion, minimumLibvipsVersion);
+};
+
+module.exports = {
+  minimumLibvipsVersion: minimumLibvipsVersion,
+  globalLibvipsVersion: globalLibvipsVersion,
+  hasVendoredLibvips: hasVendoredLibvips,
+  pkgConfigPath: pkgConfigPath,
+  useGlobalLibvips: useGlobalLibvips
+};

lib/operation.js

@@ -0,0 +1,483 @@
+'use strict';
+
+const is = require('./is');
+
+/**
+ * Rotate the output image by either an explicit angle
+ * or auto-orient based on the EXIF `Orientation` tag.
+ *
+ * If an angle is provided, it is converted to a valid 90/180/270deg rotation.
+ * For example, `-450` will produce a 270deg rotation.
+ *
+ * If no angle is provided, it is determined from the EXIF data.
+ * Mirroring is supported and may infer the use of a flip operation.
+ *
+ * The use of `rotate` implies the removal of the EXIF `Orientation` tag, if any.
+ *
+ * Method order is important when both rotating and extracting regions,
+ * for example `rotate(x).extract(y)` will produce a different result to `extract(y).rotate(x)`.
+ *
+ * @example
+ * const pipeline = sharp()
+ *   .rotate()
+ *   .resize(null, 200)
+ *   .toBuffer(function (err, outputBuffer, info) {
+ *     // outputBuffer contains 200px high JPEG image data,
+ *     // auto-rotated using EXIF Orientation tag
+ *     // info.width and info.height contain the dimensions of the resized image
+ *   });
+ * readableStream.pipe(pipeline);
+ *
+ * @param {Number} [angle=auto] angle of rotation, must be a multiple of 90.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function rotate (angle) {
+  if (!is.defined(angle)) {
+    this.options.useExifOrientation = true;
+  } else if (is.integer(angle) && !(angle % 90)) {
+    this.options.angle = angle;
+  } else {
+    throw new Error('Unsupported angle: angle must be a positive/negative multiple of 90 ' + angle);
+  }
+  return this;
+}
+
+/**
+ * Extract a region of the image.
+ *
+ * - Use `extract` before `resize` for pre-resize extraction.
+ * - Use `extract` after `resize` for post-resize extraction.
+ * - Use `extract` before and after for both.
+ *
+ * @example
+ * sharp(input)
+ *   .extract({ left: left, top: top, width: width, height: height })
+ *   .toFile(output, function(err) {
+ *     // Extract a region of the input image, saving in the same format.
+ *   });
+ * @example
+ * sharp(input)
+ *   .extract({ left: leftOffsetPre, top: topOffsetPre, width: widthPre, height: heightPre })
+ *   .resize(width, height)
+ *   .extract({ left: leftOffsetPost, top: topOffsetPost, width: widthPost, height: heightPost })
+ *   .toFile(output, function(err) {
+ *     // Extract a region, resize, then extract from the resized image
+ *   });
+ *
+ * @param {Object} options
+ * @param {Number} options.left - zero-indexed offset from left edge
+ * @param {Number} options.top - zero-indexed offset from top edge
+ * @param {Number} options.width - dimension of extracted image
+ * @param {Number} options.height - dimension of extracted image
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function extract (options) {
+  const suffix = this.options.width === -1 && this.options.height === -1 ? 'Pre' : 'Post';
+  ['left', 'top', 'width', 'height'].forEach(function (name) {
+    const value = options[name];
+    if (is.integer(value) && value >= 0) {
+      this.options[name + (name === 'left' || name === 'top' ? 'Offset' : '') + suffix] = value;
+    } else {
+      throw new Error('Non-integer value for ' + name + ' of ' + value);
+    }
+  }, this);
+  // Ensure existing rotation occurs before pre-resize extraction
+  if (suffix === 'Pre' && ((this.options.angle % 360) !== 0 || this.options.useExifOrientation === true)) {
+    this.options.rotateBeforePreExtract = true;
+  }
+  return this;
+}
+
+/**
+ * Flip the image about the vertical Y axis. This always occurs after rotation, if any.
+ * The use of `flip` implies the removal of the EXIF `Orientation` tag, if any.
+ * @param {Boolean} [flip=true]
+ * @returns {Sharp}
+ */
+function flip (flip) {
+  this.options.flip = is.bool(flip) ? flip : true;
+  return this;
+}
+
+/**
+ * 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.
+ * @param {Boolean} [flop=true]
+ * @returns {Sharp}
+ */
+function flop (flop) {
+  this.options.flop = is.bool(flop) ? flop : true;
+  return this;
+}
+
+/**
+ * Sharpen the image.
+ * When used without parameters, performs a fast, mild sharpen of the output image.
+ * When a `sigma` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space.
+ * Separate control over the level of sharpening in "flat" and "jagged" areas is available.
+ *
+ * @param {Number} [sigma] - the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+ * @param {Number} [flat=1.0] - the level of sharpening to apply to "flat" areas.
+ * @param {Number} [jagged=2.0] - the level of sharpening to apply to "jagged" areas.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function sharpen (sigma, flat, jagged) {
+  if (!is.defined(sigma)) {
+    // No arguments: default to mild sharpen
+    this.options.sharpenSigma = -1;
+  } else if (is.bool(sigma)) {
+    // Boolean argument: apply mild sharpen?
+    this.options.sharpenSigma = sigma ? -1 : 0;
+  } else if (is.number(sigma) && is.inRange(sigma, 0.01, 10000)) {
+    // Numeric argument: specific sigma
+    this.options.sharpenSigma = sigma;
+    // Control over flat areas
+    if (is.defined(flat)) {
+      if (is.number(flat) && is.inRange(flat, 0, 10000)) {
+        this.options.sharpenFlat = flat;
+      } else {
+        throw new Error('Invalid sharpen level for flat areas (0.0 - 10000.0) ' + flat);
+      }
+    }
+    // Control over jagged areas
+    if (is.defined(jagged)) {
+      if (is.number(jagged) && is.inRange(jagged, 0, 10000)) {
+        this.options.sharpenJagged = jagged;
+      } else {
+        throw new Error('Invalid sharpen level for jagged areas (0.0 - 10000.0) ' + jagged);
+      }
+    }
+  } else {
+    throw new Error('Invalid sharpen sigma (0.01 - 10000) ' + sigma);
+  }
+  return this;
+}
+
+/**
+ * Apply median filter.
+ * When used without parameters the default window is 3x3.
+ * @param {Number} [size=3] square mask size: size x size
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function median (size) {
+  if (!is.defined(size)) {
+    // No arguments: default to 3x3
+    this.options.medianSize = 3;
+  } else if (is.integer(size) && is.inRange(size, 1, 1000)) {
+    // Numeric argument: specific sigma
+    this.options.medianSize = size;
+  } else {
+    throw new Error('Invalid median size ' + size);
+  }
+  return this;
+}
+
+/**
+ * Blur the image.
+ * When used without parameters, performs a fast, mild blur of the output image.
+ * When a `sigma` is provided, performs a slower, more accurate Gaussian blur.
+ * @param {Number} [sigma] a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function blur (sigma) {
+  if (!is.defined(sigma)) {
+    // No arguments: default to mild blur
+    this.options.blurSigma = -1;
+  } else if (is.bool(sigma)) {
+    // Boolean argument: apply mild blur?
+    this.options.blurSigma = sigma ? -1 : 0;
+  } else if (is.number(sigma) && is.inRange(sigma, 0.3, 1000)) {
+    // Numeric argument: specific sigma
+    this.options.blurSigma = sigma;
+  } else {
+    throw new Error('Invalid blur sigma (0.3 - 1000.0) ' + sigma);
+  }
+  return this;
+}
+
+/**
+ * Extends/pads the edges of the image with the colour provided to the `background` method.
+ * This operation will always occur after resizing and extraction, if any.
+ *
+ * @example
+ * // Resize to 140 pixels wide, then add 10 transparent pixels
+ * // to the top, left and right edges and 20 to the bottom edge
+ * sharp(input)
+ *   .resize(140)
+ *   .background({r: 0, g: 0, b: 0, alpha: 0})
+ *   .extend({top: 10, bottom: 20, left: 10, right: 10})
+ *   ...
+ *
+ * @param {(Number|Object)} extend - single pixel count to add to all edges or an Object with per-edge counts
+ * @param {Number} [extend.top]
+ * @param {Number} [extend.left]
+ * @param {Number} [extend.bottom]
+ * @param {Number} [extend.right]
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+*/
+function extend (extend) {
+  if (is.integer(extend) && extend > 0) {
+    this.options.extendTop = extend;
+    this.options.extendBottom = extend;
+    this.options.extendLeft = extend;
+    this.options.extendRight = extend;
+  } else if (
+    is.object(extend) &&
+    is.integer(extend.top) && extend.top >= 0 &&
+    is.integer(extend.bottom) && extend.bottom >= 0 &&
+    is.integer(extend.left) && extend.left >= 0 &&
+    is.integer(extend.right) && extend.right >= 0
+  ) {
+    this.options.extendTop = extend.top;
+    this.options.extendBottom = extend.bottom;
+    this.options.extendLeft = extend.left;
+    this.options.extendRight = extend.right;
+  } else {
+    throw new Error('Invalid edge extension ' + extend);
+  }
+  return this;
+}
+
+/**
+ * Merge alpha transparency channel, if any, with `background`.
+ * @param {Boolean} [flatten=true]
+ * @returns {Sharp}
+ */
+function flatten (flatten) {
+  this.options.flatten = is.bool(flatten) ? flatten : true;
+  return this;
+}
+
+/**
+ * Trim "boring" pixels from all edges that contain values within a percentage similarity of the top-left pixel.
+ * @param {Number} [tolerance=10] value between 1 and 99 representing the percentage similarity.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function trim (tolerance) {
+  if (!is.defined(tolerance)) {
+    this.options.trimTolerance = 10;
+  } else if (is.integer(tolerance) && is.inRange(tolerance, 1, 99)) {
+    this.options.trimTolerance = tolerance;
+  } else {
+    throw new Error('Invalid trim tolerance (1 to 99) ' + tolerance);
+  }
+  return this;
+}
+
+/**
+ * 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`.
+ * This can improve the perceived brightness of a resized image in non-linear colour spaces.
+ * JPEG and WebP input images will not take advantage of the shrink-on-load performance optimisation
+ * when applying a gamma correction.
+ * @param {Number} [gamma=2.2] value between 1.0 and 3.0.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function gamma (gamma) {
+  if (!is.defined(gamma)) {
+    // Default gamma correction of 2.2 (sRGB)
+    this.options.gamma = 2.2;
+  } else if (is.number(gamma) && is.inRange(gamma, 1, 3)) {
+    this.options.gamma = gamma;
+  } else {
+    throw new Error('Invalid gamma correction (1.0 to 3.0) ' + gamma);
+  }
+  return this;
+}
+
+/**
+ * Produce the "negative" of the image.
+ * @param {Boolean} [negate=true]
+ * @returns {Sharp}
+ */
+function negate (negate) {
+  this.options.negate = is.bool(negate) ? negate : true;
+  return this;
+}
+
+/**
+ * Enhance output image contrast by stretching its luminance to cover the full dynamic range.
+ * @param {Boolean} [normalise=true]
+ * @returns {Sharp}
+ */
+function normalise (normalise) {
+  this.options.normalise = is.bool(normalise) ? normalise : true;
+  return this;
+}
+
+/**
+ * Alternative spelling of normalise.
+ * @param {Boolean} [normalize=true]
+ * @returns {Sharp}
+ */
+function normalize (normalize) {
+  return this.normalise(normalize);
+}
+
+/**
+ * Convolve the image with the specified kernel.
+ *
+ * @example
+ * sharp(input)
+ *   .convolve({
+ *     width: 3,
+ *     height: 3,
+ *     kernel: [-1, 0, 1, -2, 0, 2, -1, 0, 1]
+ *   })
+ *   .raw()
+ *   .toBuffer(function(err, data, info) {
+ *     // data contains the raw pixel data representing the convolution
+ *     // of the input image with the horizontal Sobel operator
+ *   });
+ *
+ * @param {Object} kernel
+ * @param {Number} kernel.width - width of the kernel in pixels.
+ * @param {Number} kernel.height - width of the kernel in pixels.
+ * @param {Array<Number>} kernel.kernel - Array of length `width*height` containing the kernel values.
+ * @param {Number} [kernel.scale=sum] - the scale of the kernel in pixels.
+ * @param {Number} [kernel.offset=0] - the offset of the kernel in pixels.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function convolve (kernel) {
+  if (!is.object(kernel) || !Array.isArray(kernel.kernel) ||
+      !is.integer(kernel.width) || !is.integer(kernel.height) ||
+      !is.inRange(kernel.width, 3, 1001) || !is.inRange(kernel.height, 3, 1001) ||
+      kernel.height * kernel.width !== kernel.kernel.length
+  ) {
+    // must pass in a kernel
+    throw new Error('Invalid convolution kernel');
+  }
+  // Default scale is sum of kernel values
+  if (!is.integer(kernel.scale)) {
+    kernel.scale = kernel.kernel.reduce(function (a, b) {
+      return a + b;
+    }, 0);
+  }
+  // Clip scale to a minimum value of 1
+  if (kernel.scale < 1) {
+    kernel.scale = 1;
+  }
+  if (!is.integer(kernel.offset)) {
+    kernel.offset = 0;
+  }
+  this.options.convKernel = kernel;
+  return this;
+}
+
+/**
+ * Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
+ * @param {Number} [threshold=128] - a value in the range 0-255 representing the level at which the threshold will be applied.
+ * @param {Object} [options]
+ * @param {Boolean} [options.greyscale=true] - convert to single channel greyscale.
+ * @param {Boolean} [options.grayscale=true] - alternative spelling for greyscale.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function threshold (threshold, options) {
+  if (!is.defined(threshold)) {
+    this.options.threshold = 128;
+  } else if (is.bool(threshold)) {
+    this.options.threshold = threshold ? 128 : 0;
+  } else if (is.integer(threshold) && is.inRange(threshold, 0, 255)) {
+    this.options.threshold = threshold;
+  } else {
+    throw new Error('Invalid threshold (0 to 255) ' + threshold);
+  }
+  if (!is.object(options) || options.greyscale === true || options.grayscale === true) {
+    this.options.thresholdGrayscale = true;
+  } else {
+    this.options.thresholdGrayscale = false;
+  }
+  return this;
+}
+
+/**
+ * Perform a bitwise boolean operation with operand image.
+ *
+ * This operation creates an output image where each pixel is the result of
+ * the selected bitwise boolean `operation` between the corresponding pixels of the input images.
+ *
+ * @param {Buffer|String} operand - Buffer containing image data or String containing the path to an image file.
+ * @param {String} operator - one of `and`, `or` or `eor` to perform that bitwise operation, like the C logic operators `&`, `|` and `^` respectively.
+ * @param {Object} [options]
+ * @param {Object} [options.raw] - describes operand when using raw pixel data.
+ * @param {Number} [options.raw.width]
+ * @param {Number} [options.raw.height]
+ * @param {Number} [options.raw.channels]
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function boolean (operand, operator, options) {
+  this.options.boolean = this._createInputDescriptor(operand, options);
+  if (is.string(operator) && is.inArray(operator, ['and', 'or', 'eor'])) {
+    this.options.booleanOp = operator;
+  } else {
+    throw new Error('Invalid boolean operator ' + operator);
+  }
+  return this;
+}
+
+/**
+ * Apply the linear formula a * input + b to the image (levels adjustment)
+ * @param {Number} [a=1.0] multiplier
+ * @param {Number} [b=0.0] offset
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function linear (a, b) {
+  if (!is.defined(a)) {
+    this.options.linearA = 1.0;
+  } else if (is.number(a)) {
+    this.options.linearA = a;
+  } else {
+    throw new Error('Invalid linear transform multiplier ' + a);
+  }
+
+  if (!is.defined(b)) {
+    this.options.linearB = 0.0;
+  } else if (is.number(b)) {
+    this.options.linearB = b;
+  } else {
+    throw new Error('Invalid linear transform offset ' + b);
+  }
+
+  return this;
+}
+
+/**
+ * Decorate the Sharp prototype with operation-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  [
+    rotate,
+    extract,
+    flip,
+    flop,
+    sharpen,
+    median,
+    blur,
+    extend,
+    flatten,
+    trim,
+    gamma,
+    negate,
+    normalise,
+    normalize,
+    convolve,
+    threshold,
+    boolean,
+    linear
+  ].forEach(function (f) {
+    Sharp.prototype[f.name] = f;
+  });
+};

lib/output.js

@@ -0,0 +1,638 @@
+'use strict';
+
+const is = require('./is');
+const sharp = require('../build/Release/sharp.node');
+
+/**
+ * Write output image data to a file.
+ *
+ * If an explicit output format is not selected, it will be inferred from the extension,
+ * with JPEG, PNG, WebP, TIFF, DZI, and libvips' V format supported.
+ * Note that raw pixel data is only supported for buffer output.
+ *
+ * A `Promise` is returned when `callback` is not provided.
+ *
+ * @example
+ * sharp(input)
+ *   .toFile('output.png', (err, info) => { ... });
+ *
+ * @example
+ * sharp(input)
+ *   .toFile('output.png')
+ *   .then(info => { ... })
+ *   .catch(err => { ... });
+ *
+ * @param {String} fileOut - the path to write the image data to.
+ * @param {Function} [callback] - called on completion with two arguments `(err, info)`.
+ * `info` contains the output image `format`, `size` (bytes), `width`, `height`,
+ * `channels` and `premultiplied` (indicating if premultiplication was used).
+ * When using a crop strategy also contains `cropOffsetLeft` and `cropOffsetTop`.
+ * @returns {Promise<Object>} - when no callback is provided
+ * @throws {Error} Invalid parameters
+ */
+function toFile (fileOut, callback) {
+  if (!fileOut || fileOut.length === 0) {
+    const errOutputInvalid = new Error('Invalid output');
+    if (is.fn(callback)) {
+      callback(errOutputInvalid);
+    } else {
+      return Promise.reject(errOutputInvalid);
+    }
+  } else {
+    if (this.options.input.file === fileOut) {
+      const errOutputIsInput = new Error('Cannot use same file for input and output');
+      if (is.fn(callback)) {
+        callback(errOutputIsInput);
+      } else {
+        return Promise.reject(errOutputIsInput);
+      }
+    } else {
+      this.options.fileOut = fileOut;
+      return this._pipeline(callback);
+    }
+  }
+  return this;
+}
+
+/**
+ * Write output to a Buffer.
+ * JPEG, PNG, WebP, TIFF and RAW output are supported.
+ * By default, the format will match the input image, except GIF and SVG input which become PNG output.
+ *
+ * `callback`, if present, gets three arguments `(err, data, info)` where:
+ * - `err` is an error, if any.
+ * - `data` is the output image data.
+ * - `info` contains the output image `format`, `size` (bytes), `width`, `height`,
+ * `channels` and `premultiplied` (indicating if premultiplication was used).
+ * When using a crop strategy also contains `cropOffsetLeft` and `cropOffsetTop`.
+ *
+ * A `Promise` is returned when `callback` is not provided.
+ *
+ * @example
+ * sharp(input)
+ *   .toBuffer((err, data, info) => { ... });
+ *
+ * @example
+ * sharp(input)
+ *   .toBuffer()
+ *   .then(data => { ... })
+ *   .catch(err => { ... });
+ *
+ * @example
+ * sharp(input)
+ *   .toBuffer({ resolveWithObject: true })
+ *   .then(({ data, info }) => { ... })
+ *   .catch(err => { ... });
+ *
+ * @param {Object} [options]
+ * @param {Boolean} [options.resolveWithObject] Resolve the Promise with an Object containing `data` and `info` properties instead of resolving only with `data`.
+ * @param {Function} [callback]
+ * @returns {Promise<Buffer>} - when no callback is provided
+ */
+function toBuffer (options, callback) {
+  if (is.object(options)) {
+    if (is.bool(options.resolveWithObject)) {
+      this.options.resolveWithObject = options.resolveWithObject;
+    }
+  }
+  return this._pipeline(is.fn(options) ? options : callback);
+}
+
+/**
+ * Include all metadata (EXIF, XMP, IPTC) from the input image in the output image.
+ * The default behaviour, when `withMetadata` is not used, is to strip all metadata and convert to the device-independent sRGB colour space.
+ * This will also convert to and add a web-friendly sRGB ICC profile.
+ *
+ * @example
+ * sharp('input.jpg')
+ *   .withMetadata()
+ *   .toFile('output-with-metadata.jpg')
+ *   .then(info => { ... });
+ *
+ * @param {Object} [withMetadata]
+ * @param {Number} [withMetadata.orientation] value between 1 and 8, used to update the EXIF `Orientation` tag.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function withMetadata (withMetadata) {
+  this.options.withMetadata = is.bool(withMetadata) ? withMetadata : true;
+  if (is.object(withMetadata)) {
+    if (is.defined(withMetadata.orientation)) {
+      if (is.integer(withMetadata.orientation) && is.inRange(withMetadata.orientation, 1, 8)) {
+        this.options.withMetadataOrientation = withMetadata.orientation;
+      } else {
+        throw new Error('Invalid orientation (1 to 8) ' + withMetadata.orientation);
+      }
+    }
+  }
+  return this;
+}
+
+/**
+ * Use these JPEG options for output image.
+ *
+ * @example
+ * // Convert any input to very high quality JPEG output
+ * const data = await sharp(input)
+ *   .jpeg({
+ *     quality: 100,
+ *     chromaSubsampling: '4:4:4'
+ *   })
+ *   .toBuffer();
+ *
+ * @param {Object} [options] - output options
+ * @param {Number} [options.quality=80] - quality, integer 1-100
+ * @param {Boolean} [options.progressive=false] - use progressive (interlace) scan
+ * @param {String} [options.chromaSubsampling='4:2:0'] - set to '4:4:4' to prevent chroma subsampling when quality <= 90
+ * @param {Boolean} [options.trellisQuantisation=false] - apply trellis quantisation, requires mozjpeg
+ * @param {Boolean} [options.overshootDeringing=false] - apply overshoot deringing, requires mozjpeg
+ * @param {Boolean} [options.optimiseScans=false] - optimise progressive scans, forces progressive, requires mozjpeg
+ * @param {Boolean} [options.optimizeScans=false] - alternative spelling of optimiseScans
+ * @param {Boolean} [options.force=true] - force JPEG output, otherwise attempt to use input format
+ * @returns {Sharp}
+ * @throws {Error} Invalid options
+ */
+function jpeg (options) {
+  if (is.object(options)) {
+    if (is.defined(options.quality)) {
+      if (is.integer(options.quality) && is.inRange(options.quality, 1, 100)) {
+        this.options.jpegQuality = options.quality;
+      } else {
+        throw new Error('Invalid quality (integer, 1-100) ' + options.quality);
+      }
+    }
+    if (is.defined(options.progressive)) {
+      this._setBooleanOption('jpegProgressive', options.progressive);
+    }
+    if (is.defined(options.chromaSubsampling)) {
+      if (is.string(options.chromaSubsampling) && is.inArray(options.chromaSubsampling, ['4:2:0', '4:4:4'])) {
+        this.options.jpegChromaSubsampling = options.chromaSubsampling;
+      } else {
+        throw new Error('Invalid chromaSubsampling (4:2:0, 4:4:4) ' + options.chromaSubsampling);
+      }
+    }
+    options.trellisQuantisation = is.bool(options.trellisQuantization) ? options.trellisQuantization : options.trellisQuantisation;
+    if (is.defined(options.trellisQuantisation)) {
+      this._setBooleanOption('jpegTrellisQuantisation', options.trellisQuantisation);
+    }
+    if (is.defined(options.overshootDeringing)) {
+      this._setBooleanOption('jpegOvershootDeringing', options.overshootDeringing);
+    }
+    options.optimiseScans = is.bool(options.optimizeScans) ? options.optimizeScans : options.optimiseScans;
+    if (is.defined(options.optimiseScans)) {
+      this._setBooleanOption('jpegOptimiseScans', options.optimiseScans);
+      if (options.optimiseScans) {
+        this.options.jpegProgressive = true;
+      }
+    }
+  }
+  return this._updateFormatOut('jpeg', options);
+}
+
+/**
+ * Use these PNG options for output image.
+ *
+ * PNG output is always full colour at 8 or 16 bits per pixel.
+ * Indexed PNG input at 1, 2 or 4 bits per pixel is converted to 8 bits per pixel.
+ *
+ * @example
+ * // Convert any input to PNG output
+ * const data = await sharp(input)
+ *   .png()
+ *   .toBuffer();
+ *
+ * @param {Object} [options]
+ * @param {Boolean} [options.progressive=false] - use progressive (interlace) scan
+ * @param {Number} [options.compressionLevel=9] - zlib compression level, 0-9
+ * @param {Boolean} [options.adaptiveFiltering=false] - use adaptive row filtering
+ * @param {Boolean} [options.force=true] - force PNG output, otherwise attempt to use input format
+ * @returns {Sharp}
+ * @throws {Error} Invalid options
+ */
+function png (options) {
+  if (is.object(options)) {
+    if (is.defined(options.progressive)) {
+      this._setBooleanOption('pngProgressive', options.progressive);
+    }
+    if (is.defined(options.compressionLevel)) {
+      if (is.integer(options.compressionLevel) && is.inRange(options.compressionLevel, 0, 9)) {
+        this.options.pngCompressionLevel = options.compressionLevel;
+      } else {
+        throw new Error('Invalid compressionLevel (integer, 0-9) ' + options.compressionLevel);
+      }
+    }
+    if (is.defined(options.adaptiveFiltering)) {
+      this._setBooleanOption('pngAdaptiveFiltering', options.adaptiveFiltering);
+    }
+  }
+  return this._updateFormatOut('png', options);
+}
+
+/**
+ * Use these WebP options for output image.
+ *
+ * @example
+ * // Convert any input to lossless WebP output
+ * const data = await sharp(input)
+ *   .webp({ lossless: true })
+ *   .toBuffer();
+ *
+ * @param {Object} [options] - output options
+ * @param {Number} [options.quality=80] - quality, integer 1-100
+ * @param {Number} [options.alphaQuality=100] - quality of alpha layer, integer 0-100
+ * @param {Boolean} [options.lossless=false] - use lossless compression mode
+ * @param {Boolean} [options.nearLossless=false] - use near_lossless compression mode
+ * @param {Boolean} [options.force=true] - force WebP output, otherwise attempt to use input format
+ * @returns {Sharp}
+ * @throws {Error} Invalid options
+ */
+function webp (options) {
+  if (is.object(options) && is.defined(options.quality)) {
+    if (is.integer(options.quality) && is.inRange(options.quality, 1, 100)) {
+      this.options.webpQuality = options.quality;
+    } else {
+      throw new Error('Invalid quality (integer, 1-100) ' + options.quality);
+    }
+  }
+  if (is.object(options) && is.defined(options.alphaQuality)) {
+    if (is.integer(options.alphaQuality) && is.inRange(options.alphaQuality, 1, 100)) {
+      this.options.webpAlphaQuality = options.alphaQuality;
+    } else {
+      throw new Error('Invalid webp alpha quality (integer, 1-100) ' + options.alphaQuality);
+    }
+  }
+  if (is.object(options) && is.defined(options.lossless)) {
+    this._setBooleanOption('webpLossless', options.lossless);
+  }
+  if (is.object(options) && is.defined(options.nearLossless)) {
+    this._setBooleanOption('webpNearLossless', options.nearLossless);
+  }
+  return this._updateFormatOut('webp', options);
+}
+
+/**
+ * Use these TIFF options for output image.
+ *
+ * @example
+ * // Convert SVG input to LZW-compressed, 1 bit per pixel TIFF output
+ * sharp('input.svg')
+ *   .tiff({
+ *     compression: 'lzw',
+ *     squash: true
+ *   })
+ *   .toFile('1-bpp-output.tiff')
+ *   .then(info => { ... });
+ *
+ * @param {Object} [options] - output options
+ * @param {Number} [options.quality=80] - quality, integer 1-100
+ * @param {Boolean} [options.force=true] - force TIFF output, otherwise attempt to use input format
+ * @param {Boolean} [options.compression='jpeg'] - compression options: lzw, deflate, jpeg, ccittfax4
+ * @param {Boolean} [options.predictor='horizontal'] - compression predictor options: none, horizontal, float
+ * @param {Number} [options.xres=1.0] - horizontal resolution in pixels/mm
+ * @param {Number} [options.yres=1.0] - vertical resolution in pixels/mm
+ * @param {Boolean} [options.squash=false] - squash 8-bit images down to 1 bit
+ * @returns {Sharp}
+ * @throws {Error} Invalid options
+ */
+function tiff (options) {
+  if (is.object(options) && is.defined(options.quality)) {
+    if (is.integer(options.quality) && is.inRange(options.quality, 1, 100)) {
+      this.options.tiffQuality = options.quality;
+    } else {
+      throw new Error('Invalid quality (integer, 1-100) ' + options.quality);
+    }
+  }
+  if (is.object(options) && is.defined(options.squash)) {
+    if (is.bool(options.squash)) {
+      this.options.tiffSquash = options.squash;
+    } else {
+      throw new Error('Invalid Value for squash ' + options.squash + ' Only Boolean Values allowed for options.squash.');
+    }
+  }
+  // resolution
+  if (is.object(options) && is.defined(options.xres)) {
+    if (is.number(options.xres)) {
+      this.options.tiffXres = options.xres;
+    } else {
+      throw new Error('Invalid Value for xres ' + options.xres + ' Only numeric values allowed for options.xres');
+    }
+  }
+  if (is.object(options) && is.defined(options.yres)) {
+    if (is.number(options.yres)) {
+      this.options.tiffYres = options.yres;
+    } else {
+      throw new Error('Invalid Value for yres ' + options.yres + ' Only numeric values allowed for options.yres');
+    }
+  }
+  // compression
+  if (is.defined(options) && is.defined(options.compression)) {
+    if (is.string(options.compression) && is.inArray(options.compression, ['lzw', 'deflate', 'jpeg', 'ccittfax4', 'none'])) {
+      this.options.tiffCompression = options.compression;
+    } else {
+      const message = `Invalid compression option "${options.compression}". Should be one of: lzw, deflate, jpeg, ccittfax4, none`;
+      throw new Error(message);
+    }
+  }
+  // predictor
+  if (is.defined(options) && is.defined(options.predictor)) {
+    if (is.string(options.predictor) && is.inArray(options.predictor, ['none', 'horizontal', 'float'])) {
+      this.options.tiffPredictor = options.predictor;
+    } else {
+      const message = `Invalid predictor option "${options.predictor}". Should be one of: none, horizontal, float`;
+      throw new Error(message);
+    }
+  }
+  return this._updateFormatOut('tiff', options);
+}
+
+/**
+ * Force output to be raw, uncompressed uint8 pixel data.
+ *
+ * @example
+ * // Extract raw RGB pixel data from JPEG input
+ * const { data, info } = await sharp('input.jpg')
+ *   .raw()
+ *   .toBuffer({ resolveWithObject: true });
+ *
+ * @returns {Sharp}
+ */
+function raw () {
+  return this._updateFormatOut('raw');
+}
+
+/**
+ * Force output to a given format.
+ *
+ * @example
+ * // Convert any input to PNG output
+ * const data = await sharp(input)
+ *   .toFormat('png')
+ *   .toBuffer();
+ *
+ * @param {(String|Object)} format - as a String or an Object with an 'id' attribute
+ * @param {Object} options - output options
+ * @returns {Sharp}
+ * @throws {Error} unsupported format or options
+ */
+function toFormat (format, options) {
+  if (is.object(format) && is.string(format.id)) {
+    format = format.id;
+  }
+  if (format === 'jpg') format = 'jpeg';
+  if (!is.inArray(format, ['jpeg', 'png', 'webp', 'tiff', 'raw'])) {
+    throw new Error('Unsupported output format ' + format);
+  }
+  return this[format](options);
+}
+
+/**
+ * Use tile-based deep zoom (image pyramid) output.
+ * Set the format and options for tile images via the `toFormat`, `jpeg`, `png` or `webp` functions.
+ * Use a `.zip` or `.szi` file extension with `toFile` to write to a compressed archive file format.
+ *
+ * Warning: multiple sharp instances concurrently producing tile output can expose a possible race condition in some versions of libgsf.
+ *
+ * @example
+ *  sharp('input.tiff')
+ *   .png()
+ *   .tile({
+ *     size: 512
+ *   })
+ *   .toFile('output.dz', function(err, info) {
+ *     // output.dzi is the Deep Zoom XML definition
+ *     // output_files contains 512x512 tiles grouped by zoom level
+ *   });
+ *
+ * @param {Object} [tile]
+ * @param {Number} [tile.size=256] tile size in pixels, a value between 1 and 8192.
+ * @param {Number} [tile.overlap=0] tile overlap in pixels, a value between 0 and 8192.
+ * @param {Number} [tile.angle=0] tile angle of rotation, must be a multiple of 90.
+ * @param {String} [tile.container='fs'] tile container, with value `fs` (filesystem) or `zip` (compressed file).
+ * @param {String} [tile.layout='dz'] filesystem layout, possible values are `dz`, `zoomify` or `google`.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function tile (tile) {
+  if (is.object(tile)) {
+    // Size of square tiles, in pixels
+    if (is.defined(tile.size)) {
+      if (is.integer(tile.size) && is.inRange(tile.size, 1, 8192)) {
+        this.options.tileSize = tile.size;
+      } else {
+        throw new Error('Invalid tile size (1 to 8192) ' + tile.size);
+      }
+    }
+    // Overlap of tiles, in pixels
+    if (is.defined(tile.overlap)) {
+      if (is.integer(tile.overlap) && is.inRange(tile.overlap, 0, 8192)) {
+        if (tile.overlap > this.options.tileSize) {
+          throw new Error('Tile overlap ' + tile.overlap + ' cannot be larger than tile size ' + this.options.tileSize);
+        }
+        this.options.tileOverlap = tile.overlap;
+      } else {
+        throw new Error('Invalid tile overlap (0 to 8192) ' + tile.overlap);
+      }
+    }
+    // Container
+    if (is.defined(tile.container)) {
+      if (is.string(tile.container) && is.inArray(tile.container, ['fs', 'zip'])) {
+        this.options.tileContainer = tile.container;
+      } else {
+        throw new Error('Invalid tile container ' + tile.container);
+      }
+    }
+    // Layout
+    if (is.defined(tile.layout)) {
+      if (is.string(tile.layout) && is.inArray(tile.layout, ['dz', 'google', 'zoomify'])) {
+        this.options.tileLayout = tile.layout;
+      } else {
+        throw new Error('Invalid tile layout ' + tile.layout);
+      }
+    }
+
+    // Angle of rotation,
+    if (is.defined(tile.angle)) {
+      if (is.integer(tile.angle) && !(tile.angle % 90)) {
+        this.options.tileAngle = tile.angle;
+      } else {
+        throw new Error('Unsupported angle: angle must be a positive/negative multiple of 90 ' + tile.angle);
+      }
+    }
+  }
+  // Format
+  if (is.inArray(this.options.formatOut, ['jpeg', 'png', 'webp'])) {
+    this.options.tileFormat = this.options.formatOut;
+  } else if (this.options.formatOut !== 'input') {
+    throw new Error('Invalid tile format ' + this.options.formatOut);
+  }
+
+  return this._updateFormatOut('dz');
+}
+
+/**
+ * Update the output format unless options.force is false,
+ * in which case revert to input format.
+ * @private
+ * @param {String} formatOut
+ * @param {Object} [options]
+ * @param {Boolean} [options.force=true] - force output format, otherwise attempt to use input format
+ * @returns {Sharp}
+ */
+function _updateFormatOut (formatOut, options) {
+  this.options.formatOut = (is.object(options) && options.force === false) ? 'input' : formatOut;
+  return this;
+}
+
+/**
+ * Update a Boolean attribute of the this.options Object.
+ * @private
+ * @param {String} key
+ * @param {Boolean} val
+ * @throws {Error} Invalid key
+ */
+function _setBooleanOption (key, val) {
+  if (is.bool(val)) {
+    this.options[key] = val;
+  } else {
+    throw new Error('Invalid ' + key + ' (boolean) ' + val);
+  }
+}
+
+/**
+ * Called by a WriteableStream to notify us it is ready for data.
+ * @private
+ */
+function _read () {
+  if (!this.options.streamOut) {
+    this.options.streamOut = true;
+    this._pipeline();
+  }
+}
+
+/**
+ * Invoke the C++ image processing pipeline
+ * Supports callback, stream and promise variants
+ * @private
+ */
+function _pipeline (callback) {
+  const that = this;
+  if (typeof callback === 'function') {
+    // output=file/buffer
+    if (this._isStreamInput()) {
+      // output=file/buffer, input=stream
+      this.on('finish', function () {
+        that._flattenBufferIn();
+        sharp.pipeline(that.options, callback);
+      });
+    } else {
+      // output=file/buffer, input=file/buffer
+      sharp.pipeline(this.options, callback);
+    }
+    return this;
+  } else if (this.options.streamOut) {
+    // output=stream
+    if (this._isStreamInput()) {
+      // output=stream, input=stream
+      if (this.streamInFinished) {
+        this._flattenBufferIn();
+        sharp.pipeline(this.options, function (err, data, info) {
+          if (err) {
+            that.emit('error', err);
+          } else {
+            that.emit('info', info);
+            that.push(data);
+          }
+          that.push(null);
+        });
+      } else {
+        this.on('finish', function () {
+          that._flattenBufferIn();
+          sharp.pipeline(that.options, function (err, data, info) {
+            if (err) {
+              that.emit('error', err);
+            } else {
+              that.emit('info', info);
+              that.push(data);
+            }
+            that.push(null);
+          });
+        });
+      }
+    } else {
+      // output=stream, input=file/buffer
+      sharp.pipeline(this.options, function (err, data, info) {
+        if (err) {
+          that.emit('error', err);
+        } else {
+          that.emit('info', info);
+          that.push(data);
+        }
+        that.push(null);
+      });
+    }
+    return this;
+  } else {
+    // output=promise
+    if (this._isStreamInput()) {
+      // output=promise, input=stream
+      return new Promise(function (resolve, reject) {
+        that.on('finish', function () {
+          that._flattenBufferIn();
+          sharp.pipeline(that.options, function (err, data, info) {
+            if (err) {
+              reject(err);
+            } else {
+              if (that.options.resolveWithObject) {
+                resolve({ data: data, info: info });
+              } else {
+                resolve(data);
+              }
+            }
+          });
+        });
+      });
+    } else {
+      // output=promise, input=file/buffer
+      return new Promise(function (resolve, reject) {
+        sharp.pipeline(that.options, function (err, data, info) {
+          if (err) {
+            reject(err);
+          } else {
+            if (that.options.resolveWithObject) {
+              resolve({ data: data, info: info });
+            } else {
+              resolve(data);
+            }
+          }
+        });
+      });
+    }
+  }
+}
+
+/**
+ * Decorate the Sharp prototype with output-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  [
+    // Public
+    toFile,
+    toBuffer,
+    withMetadata,
+    jpeg,
+    png,
+    webp,
+    tiff,
+    raw,
+    toFormat,
+    tile,
+    // Private
+    _updateFormatOut,
+    _setBooleanOption,
+    _read,
+    _pipeline
+  ].forEach(function (f) {
+    Sharp.prototype[f.name] = f;
+  });
+};

lib/platform.js

@@ -0,0 +1,15 @@
+'use strict';
+
+module.exports = function () {
+  const arch = process.env.npm_config_arch || process.arch;
+  const platform = process.env.npm_config_platform || process.platform;
+
+  const platformId = [platform];
+  if (arch === 'arm' || arch === 'armhf' || arch === 'arm64') {
+    const armVersion = (arch === 'arm64') ? '8' : process.env.npm_config_armv || process.config.variables.arm_version || '6';
+    platformId.push(`armv${armVersion}`);
+  } else {
+    platformId.push(arch);
+  }
+  return platformId.join('-');
+};

lib/resize.js

@@ -0,0 +1,288 @@
+'use strict';
+
+const is = require('./is');
+
+/**
+ * Weighting to apply to image crop.
+ * @member
+ * @private
+ */
+const gravity = {
+  center: 0,
+  centre: 0,
+  north: 1,
+  east: 2,
+  south: 3,
+  west: 4,
+  northeast: 5,
+  southeast: 6,
+  southwest: 7,
+  northwest: 8
+};
+
+/**
+ * Strategies for automagic crop behaviour.
+ * @member
+ * @private
+ */
+const strategy = {
+  entropy: 16,
+  attention: 17
+};
+
+/**
+ * Reduction kernels.
+ * @member
+ * @private
+ */
+const kernel = {
+  nearest: 'nearest',
+  cubic: 'cubic',
+  lanczos2: 'lanczos2',
+  lanczos3: 'lanczos3'
+};
+
+/**
+ * Resize image to `width` x `height`.
+ * By default, the resized image is centre cropped to the exact size specified.
+ *
+ * Possible kernels are:
+ * - `nearest`: Use [nearest neighbour interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation).
+ * - `cubic`: Use a [Catmull-Rom spline](https://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline).
+ * - `lanczos2`: Use a [Lanczos kernel](https://en.wikipedia.org/wiki/Lanczos_resampling#Lanczos_kernel) with `a=2`.
+ * - `lanczos3`: Use a Lanczos kernel with `a=3` (the default).
+ *
+ * @example
+ * sharp(inputBuffer)
+ *   .resize(200, 300, {
+ *     kernel: sharp.kernel.nearest
+ *   })
+ *   .background('white')
+ *   .embed()
+ *   .toFile('output.tiff')
+ *   .then(function() {
+ *     // output.tiff is a 200 pixels wide and 300 pixels high image
+ *     // containing a nearest-neighbour scaled version, embedded on a white canvas,
+ *     // of the image data in inputBuffer
+ *   });
+ *
+ * @param {Number} [width] - pixels wide the resultant image should be. Use `null` or `undefined` to auto-scale the width to match the height.
+ * @param {Number} [height] - pixels high the resultant image should be. Use `null` or `undefined` to auto-scale the height to match the width.
+ * @param {Object} [options]
+ * @param {String} [options.kernel='lanczos3'] - the kernel to use for image reduction.
+ * @param {Boolean} [options.fastShrinkOnLoad=true] - take greater advantage of the JPEG and WebP shrink-on-load feature, which can lead to a slight moiré pattern on some images.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function resize (width, height, options) {
+  if (is.defined(width)) {
+    if (is.integer(width) && width > 0) {
+      this.options.width = width;
+    } else {
+      throw is.invalidParameterError('width', 'positive integer', width);
+    }
+  } else {
+    this.options.width = -1;
+  }
+  if (is.defined(height)) {
+    if (is.integer(height) && height > 0) {
+      this.options.height = height;
+    } else {
+      throw is.invalidParameterError('height', 'positive integer', height);
+    }
+  } else {
+    this.options.height = -1;
+  }
+  if (is.object(options)) {
+    // Kernel
+    if (is.defined(options.kernel)) {
+      if (is.string(kernel[options.kernel])) {
+        this.options.kernel = kernel[options.kernel];
+      } else {
+        throw is.invalidParameterError('kernel', 'valid kernel name', options.kernel);
+      }
+    }
+    // Shrink on load
+    if (is.defined(options.fastShrinkOnLoad)) {
+      this._setBooleanOption('fastShrinkOnLoad', options.fastShrinkOnLoad);
+    }
+  }
+  return this;
+}
+
+/**
+ * Crop the resized image to the exact size specified, the default behaviour.
+ *
+ * Possible attributes of the optional `sharp.gravity` are `north`, `northeast`, `east`, `southeast`, `south`,
+ * `southwest`, `west`, `northwest`, `center` and `centre`.
+ *
+ * The experimental strategy-based approach resizes so one dimension is at its target length
+ * then repeatedly ranks edge regions, discarding the edge with the lowest score based on the selected strategy.
+ * - `entropy`: focus on the region with the highest [Shannon entropy](https://en.wikipedia.org/wiki/Entropy_%28information_theory%29).
+ * - `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.
+ *
+ * @example
+ * const transformer = sharp()
+ *   .resize(200, 200)
+ *   .crop(sharp.strategy.entropy)
+ *   .on('error', function(err) {
+ *     console.log(err);
+ *   });
+ * // Read image data from readableStream
+ * // Write 200px square auto-cropped image data to writableStream
+ * readableStream.pipe(transformer).pipe(writableStream);
+ *
+ * @param {String} [crop='centre'] - A member of `sharp.gravity` to crop to an edge/corner or `sharp.strategy` to crop dynamically.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function crop (crop) {
+  this.options.canvas = 'crop';
+  if (!is.defined(crop)) {
+    // Default
+    this.options.crop = gravity.center;
+  } else if (is.integer(crop) && is.inRange(crop, 0, 8)) {
+    // Gravity (numeric)
+    this.options.crop = crop;
+  } else if (is.string(crop) && is.integer(gravity[crop])) {
+    // Gravity (string)
+    this.options.crop = gravity[crop];
+  } else if (is.integer(crop) && crop >= strategy.entropy) {
+    // Strategy
+    this.options.crop = crop;
+  } else if (is.string(crop) && is.integer(strategy[crop])) {
+    // Strategy (string)
+    this.options.crop = strategy[crop];
+  } else {
+    throw is.invalidParameterError('crop', 'valid crop id/name/strategy', crop);
+  }
+  return this;
+}
+
+/**
+ * Preserving aspect ratio, resize the image to the maximum `width` or `height` specified
+ * then embed on a background of the exact `width` and `height` specified.
+ *
+ * If the background contains an alpha value then WebP and PNG format output images will
+ * contain an alpha channel, even when the input image does not.
+ *
+ * @example
+ * sharp('input.gif')
+ *   .resize(200, 300)
+ *   .background({r: 0, g: 0, b: 0, alpha: 0})
+ *   .embed()
+ *   .toFormat(sharp.format.webp)
+ *   .toBuffer(function(err, outputBuffer) {
+ *     if (err) {
+ *       throw err;
+ *     }
+ *     // outputBuffer contains WebP image data of a 200 pixels wide and 300 pixels high
+ *     // containing a scaled version, embedded on a transparent canvas, of input.gif
+ *   });
+ * @param {String} [embed='centre'] - A member of `sharp.gravity` to embed to an edge/corner.
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function embed (embed) {
+  this.options.canvas = 'embed';
+
+  if (!is.defined(embed)) {
+    // Default
+    this.options.embed = gravity.center;
+  } else if (is.integer(embed) && is.inRange(embed, 0, 8)) {
+    // Gravity (numeric)
+    this.options.embed = embed;
+  } else if (is.string(embed) && is.integer(gravity[embed])) {
+    // Gravity (string)
+    this.options.embed = gravity[embed];
+  } else {
+    throw is.invalidParameterError('embed', 'valid embed id/name', embed);
+  }
+
+  return this;
+}
+
+/**
+ * Preserving aspect ratio, resize the image to be as large as possible
+ * while ensuring its dimensions are less than or equal to the `width` and `height` specified.
+ *
+ * Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
+ *
+ * @example
+ * sharp(inputBuffer)
+ *   .resize(200, 200)
+ *   .max()
+ *   .toFormat('jpeg')
+ *   .toBuffer()
+ *   .then(function(outputBuffer) {
+ *     // outputBuffer contains JPEG image data no wider than 200 pixels and no higher
+ *     // than 200 pixels regardless of the inputBuffer image dimensions
+ *   });
+ *
+ * @returns {Sharp}
+ */
+function max () {
+  this.options.canvas = 'max';
+  return this;
+}
+
+/**
+ * Preserving aspect ratio, resize the image to be as small as possible
+ * while ensuring its dimensions are greater than or equal to the `width` and `height` specified.
+ *
+ * Both `width` and `height` must be provided via `resize` otherwise the behaviour will default to `crop`.
+ *
+ * @returns {Sharp}
+ */
+function min () {
+  this.options.canvas = 'min';
+  return this;
+}
+
+/**
+ * Ignoring the aspect ratio of the input, stretch the image to
+ * the exact `width` and/or `height` provided via `resize`.
+ * @returns {Sharp}
+ */
+function ignoreAspectRatio () {
+  this.options.canvas = 'ignore_aspect';
+  return this;
+}
+
+/**
+ * Do not enlarge the output image if the input image width *or* height are already less than the required dimensions.
+ * This is equivalent to GraphicsMagick's `>` geometry option:
+ * "*change the dimensions of the image only if its width or height exceeds the geometry specification*".
+ * Use with `max()` to preserve the image's aspect ratio.
+ *
+ * The default behaviour *before* function call is `false`, meaning the image will be enlarged.
+ *
+ * @param {Boolean} [withoutEnlargement=true]
+ * @returns {Sharp}
+*/
+function withoutEnlargement (withoutEnlargement) {
+  this.options.withoutEnlargement = is.bool(withoutEnlargement) ? withoutEnlargement : true;
+  return this;
+}
+
+/**
+ * Decorate the Sharp prototype with resize-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  [
+    resize,
+    crop,
+    embed,
+    max,
+    min,
+    ignoreAspectRatio,
+    withoutEnlargement
+  ].forEach(function (f) {
+    Sharp.prototype[f.name] = f;
+  });
+  // Class attributes
+  Sharp.gravity = gravity;
+  Sharp.strategy = strategy;
+  Sharp.kernel = kernel;
+};

lib/utility.js

@@ -0,0 +1,116 @@
+'use strict';
+
+const is = require('./is');
+const sharp = require('../build/Release/sharp.node');
+
+/**
+ * Gets or, when options are provided, sets the limits of _libvips'_ operation cache.
+ * Existing entries in the cache will be trimmed after any change in limits.
+ * This method always returns cache statistics,
+ * useful for determining how much working memory is required for a particular task.
+ *
+ * @example
+ * const stats = sharp.cache();
+ * @example
+ * sharp.cache( { items: 200 } );
+ * sharp.cache( { files: 0 } );
+ * sharp.cache(false);
+ *
+ * @param {Object|Boolean} [options=true] - Object with the following attributes, or Boolean where true uses default cache settings and false removes all caching
+ * @param {Number} [options.memory=50] - is the maximum memory in MB to use for this cache
+ * @param {Number} [options.files=20] - is the maximum number of files to hold open
+ * @param {Number} [options.items=100] - is the maximum number of operations to cache
+ * @returns {Object}
+ */
+function cache (options) {
+  if (is.bool(options)) {
+    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 (is.object(options)) {
+    return sharp.cache(options.memory, options.files, options.items);
+  } else {
+    return sharp.cache();
+  }
+}
+cache(true);
+
+/**
+ * Gets or, when a concurrency is provided, sets
+ * the number of threads _libvips'_ should create to process each image.
+ * The default value is the number of CPU cores.
+ * A value of `0` will reset to this default.
+ *
+ * The maximum number of images that can be processed in parallel
+ * is limited by libuv's `UV_THREADPOOL_SIZE` environment variable.
+ *
+ * This method always returns the current concurrency.
+ *
+ * @example
+ * const threads = sharp.concurrency(); // 4
+ * sharp.concurrency(2); // 2
+ * sharp.concurrency(0); // 4
+ *
+ * @param {Number} [concurrency]
+ * @returns {Number} concurrency
+ */
+function concurrency (concurrency) {
+  return sharp.concurrency(is.integer(concurrency) ? concurrency : null);
+}
+
+/**
+ * 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.
+ *
+ * @example
+ * const counters = sharp.counters(); // { queue: 2, process: 4 }
+ *
+ * @returns {Object}
+ */
+function counters () {
+  return sharp.counters();
+}
+
+/**
+ * Get and set use of SIMD vector unit instructions.
+ * Requires libvips to have been compiled with liborc support.
+ *
+ * Improves the performance of `resize`, `blur` and `sharpen` operations
+ * by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM NEON.
+ *
+ * This feature is currently off by default but future versions may reverse this.
+ * Versions of liborc prior to 0.4.25 are known to segfault under heavy load.
+ *
+ * @example
+ * const simd = sharp.simd();
+ * // simd is `true` if SIMD is currently enabled
+ * @example
+ * const simd = sharp.simd(true);
+ * // attempts to enable the use of SIMD, returning true if available
+ *
+ * @param {Boolean} [simd=false]
+ * @returns {Boolean}
+ */
+function simd (simd) {
+  return sharp.simd(is.bool(simd) ? simd : null);
+}
+simd(false);
+
+/**
+ * Decorate the Sharp class with utility-related functions.
+ * @private
+ */
+module.exports = function (Sharp) {
+  [
+    cache,
+    concurrency,
+    counters,
+    simd
+  ].forEach(function (f) {
+    Sharp[f.name] = f;
+  });
+};

mkdocs.yml

@@ -1,17 +1,25 @@
 site_name: sharp
-site_url: http://sharp.dimens.io/
+site_url: http://sharp.pixelplumbing.com/
 repo_url: https://github.com/lovell/sharp
 site_description: High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images
-copyright: <a href="https://dimens.io/">dimens.io</a>
-google_analytics: ['UA-13034748-12', 'sharp.dimens.io']
+copyright: <a href="https://pixelplumbing.com/">pixelplumbing.com</a>
+google_analytics: ['UA-13034748-12', 'sharp.pixelplumbing.com']
 theme: readthedocs
 markdown_extensions:
   - toc:
       permalink: True
-dev_addr: 0.0.0.0:10101
 pages:
   - Home: index.md
   - Installation: install.md
-  - API: api.md
+  - API:
+    - Constructor: api-constructor.md
+    - Input: api-input.md
+    - Output: api-output.md
+    - "Resizing images": api-resize.md
+    - "Compositing images": api-composite.md
+    - "Image operations": api-operation.md
+    - "Colour manipulation": api-colour.md
+    - "Channel manipulation": api-channel.md
+    - Utilities: api-utility.md
   - Performance: performance.md
   - Changelog: changelog.md

package.json

@@ -1,7 +1,9 @@
 {
   "name": "sharp",
-  "version": "0.16.1",
+  "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images",
+  "version": "0.20.4",
   "author": "Lovell Fuller <npm@lovell.info>",
+  "homepage": "https://github.com/lovell/sharp",
   "contributors": [
     "Pierre Inglebert <pierre.inglebert@gmail.com>",
     "Jonathan Ong <jonathanrichardong@gmail.com>",
@@ -27,18 +29,36 @@
     "F. Orlando Galashan <frulo@gmx.de>",
     "Kleis Auke Wolthuizen <info@kleisauke.nl>",
     "Matt Hirsch <mhirsch@media.mit.edu>",
-    "Matthias Thoemmes <thoemmes@gmail.com>"
+    "Matthias Thoemmes <thoemmes@gmail.com>",
+    "Patrick Paskaris <patrick@paskaris.gr>",
+    "Jérémy Lal <kapouer@melix.org>",
+    "Rahul Nanwani <r.nanwani@gmail.com>",
+    "Alice Monday <alice0meta@gmail.com>",
+    "Kristo Jorgenson <kristo.jorgenson@gmail.com>",
+    "YvesBos <yves_bos@outlook.com>",
+    "Guy Maliar <guy@tailorbrands.com>",
+    "Nicolas Coden <nicolas@ncoden.fr>",
+    "Matt Parrish <matt.r.parrish@gmail.com>",
+    "Marcel Bretschneider <marcel.bretschneider@gmail.com>",
+    "Matthew McEachen <matthew+github@mceachen.org>",
+    "Jarda Kotěšovec <jarda.kotesovec@gmail.com>",
+    "Kenric D'Souza <kenric.dsouza@gmail.com>",
+    "Oleh Aleinyk <oleg.aleynik@gmail.com>",
+    "Marcel Bretschneider <marcel.bretschneider@gmail.com>",
+    "Andrea Bianco <andrea.bianco@unibas.ch>",
+    "Rik Heywood <rik@rik.org>",
+    "Thomas Parisot <hi@oncletom.io>",
+    "Nathan Graves <nathanrgraves+github@gmail.com>"
   ],
-  "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images",
   "scripts": {
-    "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=60000 ./test/unit/*.js",
+    "install": "(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)",
+    "clean": "rm -rf node_modules/ build/ vendor/ coverage/ test/fixtures/output.*",
+    "test": "semistandard && cc && nyc --reporter=lcov --branches=99 mocha --slow=5000 --timeout=60000 ./test/unit/*.js && prebuild-ci",
+    "coverage": "./test/coverage/report.sh",
     "test-leak": "./test/leak/leak.sh",
-    "test-packaging": "./packaging/test-linux-x64.sh",
-    "test-clean": "rm -rf coverage/ test/fixtures/output.* && npm install && npm test"
+    "docs": "for m in constructor input resize composite operation colour channel output utility; do documentation build --shallow --format=md lib/$m.js >docs/api-$m.md; done"
   },
-  "main": "index.js",
+  "main": "lib/index.js",
   "repository": {
     "type": "git",
     "url": "git://github.com/lovell/sharp"
@@ -55,35 +75,55 @@
     "resize",
     "thumbnail",
     "crop",
+    "embed",
     "libvips",
     "vips"
   ],
   "dependencies": {
-    "bluebird": "^3.4.6",
-    "color": "^0.11.3",
-    "nan": "^2.4.0",
-    "semver": "^5.3.0",
-    "request": "^2.75.0",
-    "tar": "^2.2.1"
+    "color": "^3.0.0",
+    "detect-libc": "^1.0.3",
+    "nan": "^2.10.0",
+    "fs-copy-file-sync": "^1.1.1",
+    "npmlog": "^4.1.2",
+    "prebuild-install": "^4.0.0",
+    "semver": "^5.5.0",
+    "simple-get": "^2.8.1",
+    "tar": "^4.4.4",
+    "tunnel-agent": "^0.6.0"
   },
   "devDependencies": {
-    "async": "^2.1.0",
-    "bufferutil": "^1.2.1",
-    "coveralls": "^2.11.14",
-    "exif-reader": "^1.0.1",
-    "icc": "^0.0.2",
-    "istanbul": "^0.4.5",
-    "mocha": "^3.1.2",
-    "mocha-jshint": "^2.3.1",
-    "node-cpplint": "^0.4.0",
-    "rimraf": "^2.5.4",
-    "unzip": "^0.1.11"
+    "async": "^2.6.1",
+    "cc": "^1.0.2",
+    "decompress-zip": "^0.3.1",
+    "documentation": "^8.0.0",
+    "exif-reader": "^1.0.2",
+    "icc": "^1.0.0",
+    "mocha": "^5.2.0",
+    "nyc": "^12.0.2",
+    "prebuild": "^7.6.0",
+    "prebuild-ci": "^2.2.3",
+    "rimraf": "^2.6.2",
+    "semistandard": "^12.0.1"
   },
   "license": "Apache-2.0",
   "config": {
-    "libvips": "8.3.3"
+    "libvips": "8.6.1"
   },
   "engines": {
-    "node": ">=0.10"
+    "node": ">=4.5.0"
+  },
+  "semistandard": {
+    "env": [
+      "mocha"
+    ]
+  },
+  "cc": {
+    "linelength": "120",
+    "filter": [
+      "build/c++11",
+      "build/include",
+      "runtime/indentation_namespace",
+      "runtime/references"
+    ]
   }
 }

packaging/README.md

@@ -1,57 +0,0 @@
-# Packaging scripts
-
-libvips and its dependencies are provided as pre-compiled shared libraries
-for the most common operating systems and CPU architectures.
-
-During `npm install`, these binaries are fetched as tarballs from
-[Bintray](https://dl.bintray.com/lovell/sharp/) via HTTPS
-and stored locally within `node_modules/sharp`.
-
-## Using a custom tarball
-
-A custom tarball stored on the local filesystem can be used instead.
-Place it in the following location, where `x.y.z` is the libvips version,
-`platform` is the value of `process.platform` and
-`arch` is the value of `process.arch` (plus the version number for ARM).
-
-`node_modules/sharp/packaging/libvips-x.y.z-platform-arch.tar.gz`
-
-For example, for libvips v8.3.3 on an ARMv6 Linux machine, use:
-
-`node_modules/sharp/packaging/libvips-8.3.3-linux-armv6.tar.gz`
-
-Remove any `sharp/lib` and `sharp/include` directories
-before running `npm install` again.
-
-## Creating a tarball
-
-Most people will not need to do this; proceed with caution.
-
-The `packaging` directory contains the top-level [build script](build.sh).
-
-### Linux
-
-One [build script](build/lin.sh) is used to (cross-)compile
-the same shared libraries within multiple containers.
-
-* [x64](linux-x64/Dockerfile)
-* [ARMv6](linux-armv6/Dockerfile)
-* [ARMv7-A](linux-armv7/Dockerfile)
-* [ARMv8-A](linux-armv8/Dockerfile)
-
-The QEMU user mode emulation binaries are required to build for
-the ARMv6 platform as the Debian armhf cross-compiler erroneously
-generates unsupported Thumb 2 instructions.
-
-```sh
-sudo apt-get install qemu-user-static
-```
-
-### Windows
-
-The output of libvips' [build-win64](https://github.com/jcupitt/build-win64)
-"web" target is [post-processed](build/win.sh) within a [container](win32-x64/Dockerfile).
-
-### OS X
-
-See [package-libvips-darwin](https://github.com/lovell/package-libvips-darwin).

packaging/build.sh

@@ -1,43 +0,0 @@
-#!/bin/sh
-set -e
-
-if [ $# -lt 1 ]; then
-  echo
-  echo "Usage: $0 VERSION [PLATFORM]"
-  echo "Build shared libraries for libvips and its dependencies via containers"
-  echo
-  echo "Please specify the libvips VERSION, e.g. 8.3.3"
-  echo
-  echo "Optionally build for only one PLATFORM, defaults to building for all"
-  echo "Possible values for PLATFORM are: win32-x64, linux-x64, linux-armv6,"
-  echo "linux-armv7, linux-armv8"
-  echo
-  exit 1
-fi
-VERSION_VIPS="$1"
-PLATFORM="${2:-all}"
-
-# Is docker available?
-if ! type docker >/dev/null; then
-  echo "Please install docker"
-  exit 1
-fi
-
-# Windows (x64)
-if [ $PLATFORM = "all" ] || [ $PLATFORM = "win32-x64" ]; then
-  echo "Building win32-x64..."
-  docker build -t vips-dev-win32-x64 win32-x64
-  docker run --rm -e "VERSION_VIPS=${VERSION_VIPS}" -v $PWD:/packaging vips-dev-win32-x64 sh -c "/packaging/build/win.sh"
-fi
-
-# Linux (x64, ARMv6, ARMv7, ARMv8)
-for flavour in linux-x64 linux-armv6 linux-armv7 linux-armv8; do
-  if [ $PLATFORM = "all" ] || [ $PLATFORM = $flavour ]; then
-    echo "Building $flavour..."
-    docker build -t vips-dev-$flavour $flavour
-    docker run --rm -e "VERSION_VIPS=${VERSION_VIPS}" -v $PWD:/packaging vips-dev-$flavour sh -c "/packaging/build/lin.sh"
-  fi
-done
-
-# Display checksums
-sha256sum *.tar.gz

packaging/build/lin.sh

@@ -1,236 +0,0 @@
-#!/bin/sh
-set -e
-
-# 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${TARGET}/lib"
-export CFLAGS="${FLAGS}"
-export CXXFLAGS="${FLAGS}"
-
-# Dependency version numbers
-VERSION_ZLIB=1.2.8
-VERSION_FFI=3.2.1
-VERSION_GLIB=2.49.4
-VERSION_XML2=2.9.4
-VERSION_GSF=1.14.39
-VERSION_EXIF=0.6.21
-VERSION_LCMS2=2.8
-VERSION_JPEG=1.5.0
-VERSION_PNG16=1.6.25
-VERSION_WEBP=0.5.1
-VERSION_TIFF=4.0.6
-VERSION_ORC=0.4.25
-VERSION_GDKPIXBUF=2.35.2
-VERSION_FREETYPE=2.6.5
-VERSION_FONTCONFIG=2.12.0
-VERSION_HARFBUZZ=1.3.0
-VERSION_PIXMAN=0.34.0
-VERSION_CAIRO=1.14.6
-VERSION_PANGO=1.40.1
-VERSION_CROCO=0.6.11
-VERSION_SVG=2.40.16
-VERSION_GIF=5.1.4
-
-# Least out-of-sync Sourceforge mirror
-SOURCEFORGE_MIRROR=netix
-
-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} --uname=linux
-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 ${DEPS}/ffi
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-builddir
-make install-strip
-
-mkdir ${DEPS}/glib
-curl -Ls https://download.gnome.org/sources/glib/2.49/glib-${VERSION_GLIB}.tar.xz | tar xJC ${DEPS}/glib --strip-components=1
-cd ${DEPS}/glib
-echo glib_cv_stack_grows=no >>glib.cache
-echo glib_cv_uscore=no >>glib.cache
-./configure --cache-file=glib.cache --host=${CHOST} --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 ${DEPS}/xml2
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --without-python --without-debug --without-docbook --without-ftp --without-html --without-legacy \
-  --without-pattern --without-push --without-regexps --without-schemas --without-schematron --with-zlib=${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 ${DEPS}/gsf
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-
-mkdir ${DEPS}/exif
-curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/libexif/libexif/${VERSION_EXIF}/libexif-${VERSION_EXIF}.tar.bz2 | tar xjC ${DEPS}/exif --strip-components=1
-cd ${DEPS}/exif
-autoreconf -fiv
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-
-mkdir ${DEPS}/lcms2
-curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/lcms/lcms/${VERSION_LCMS2}/lcms2-${VERSION_LCMS2}.tar.gz | tar xzC ${DEPS}/lcms2 --strip-components=1
-cd ${DEPS}/lcms2
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-
-mkdir ${DEPS}/jpeg
-curl -Ls https://github.com/libjpeg-turbo/libjpeg-turbo/archive/${VERSION_JPEG}.tar.gz | tar xzC ${DEPS}/jpeg --strip-components=1
-cd ${DEPS}/jpeg
-autoreconf -fiv
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-jpeg8 --without-turbojpeg
-make install-strip
-
-mkdir ${DEPS}/png16
-curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/libpng/libpng16/${VERSION_PNG16}/libpng-${VERSION_PNG16}.tar.xz | tar xJC ${DEPS}/png16 --strip-components=1
-cd ${DEPS}/png16
-./configure --host=${CHOST} --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 ${DEPS}/webp
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-neon
-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 ${DEPS}/tiff
-if [ -n "${CHOST}" ]; then autoreconf -fiv; fi
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-mdi --disable-cxx
-make install-strip
-
-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 ${DEPS}/orc
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-cd ${TARGET}/lib
-rm -rf liborc-test-*
-
-mkdir ${DEPS}/gdkpixbuf
-curl -Ls https://download.gnome.org/sources/gdk-pixbuf/2.35/gdk-pixbuf-${VERSION_GDKPIXBUF}.tar.xz | tar xJC ${DEPS}/gdkpixbuf --strip-components=1
-cd ${DEPS}/gdkpixbuf
-LD_LIBRARY_PATH=${TARGET}/lib \
-./configure --cache-file=gdkpixbuf.cache --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-introspection --disable-modules --disable-gio-sniffing --without-libpng --without-libjpeg --without-libtiff --without-gdiplus --with-included-loaders=
-make install-strip
-
-mkdir ${DEPS}/freetype
-curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/freetype/freetype2/${VERSION_FREETYPE}/freetype-${VERSION_FREETYPE}.tar.gz | tar xzC ${DEPS}/freetype --strip-components=1
-cd ${DEPS}/freetype
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static
-make install
-
-mkdir ${DEPS}/fontconfig
-curl -Ls https://www.freedesktop.org/software/fontconfig/release/fontconfig-${VERSION_FONTCONFIG}.tar.bz2 | tar xjC ${DEPS}/fontconfig --strip-components=1
-cd ${DEPS}/fontconfig
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --enable-libxml2
-make install-strip
-
-mkdir ${DEPS}/harfbuzz
-curl -Ls https://www.freedesktop.org/software/harfbuzz/release/harfbuzz-${VERSION_HARFBUZZ}.tar.bz2 | tar xjC ${DEPS}/harfbuzz --strip-components=1
-cd ${DEPS}/harfbuzz
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-
-mkdir ${DEPS}/pixman
-curl -Ls http://cairographics.org/releases/pixman-${VERSION_PIXMAN}.tar.gz | tar xzC ${DEPS}/pixman --strip-components=1
-cd ${DEPS}/pixman
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-libpng --disable-arm-iwmmxt
-make install-strip
-
-mkdir ${DEPS}/cairo
-curl -Ls http://cairographics.org/releases/cairo-${VERSION_CAIRO}.tar.xz | tar xJC ${DEPS}/cairo --strip-components=1
-cd ${DEPS}/cairo
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-xlib --disable-xcb --disable-quartz --disable-win32 --disable-egl --disable-glx --disable-wgl \
-  --disable-script --disable-ps --disable-gobject --disable-trace --disable-interpreter
-make install-strip
-
-mkdir ${DEPS}/pango
-curl -Ls https://download.gnome.org/sources/pango/1.40/pango-${VERSION_PANGO}.tar.xz | tar xJC ${DEPS}/pango --strip-components=1
-cd ${DEPS}/pango
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-
-mkdir ${DEPS}/croco
-curl -Ls https://download.gnome.org/sources/libcroco/0.6/libcroco-${VERSION_CROCO}.tar.xz | tar xJC ${DEPS}/croco --strip-components=1
-cd ${DEPS}/croco
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-
-mkdir ${DEPS}/svg
-curl -Ls https://download.gnome.org/sources/librsvg/2.40/librsvg-${VERSION_SVG}.tar.xz | tar xJC ${DEPS}/svg --strip-components=1
-cd ${DEPS}/svg
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-introspection --disable-tools --disable-pixbuf-loader
-make install-strip
-
-mkdir ${DEPS}/gif
-curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/giflib/giflib-${VERSION_GIF}.tar.gz | tar xzC ${DEPS}/gif --strip-components=1
-cd ${DEPS}/gif
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
-make install-strip
-
-mkdir ${DEPS}/vips
-curl -Ls http://www.vips.ecs.soton.ac.uk/supported/8.3/vips-${VERSION_VIPS}.tar.gz | tar xzC ${DEPS}/vips --strip-components=1
-cd ${DEPS}/vips
-./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-debug --disable-introspection --without-python --without-fftw \
-  --without-magick --without-pangoft2 --without-ppm --without-analyze --without-radiance \
-  --with-zip-includes=${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 ${TARGET}
-echo "{\n\
-  \"cairo\": \"${VERSION_CAIRO}\",\n\
-  \"croco\": \"${VERSION_CROCO}\",\n\
-  \"exif\": \"${VERSION_EXIF}\",\n\
-  \"ffi\": \"${VERSION_FFI}\",\n\
-  \"fontconfig\": \"${VERSION_FONTCONFIG}\",\n\
-  \"freetype\": \"${VERSION_FREETYPE}\",\n\
-  \"gdkpixbuf\": \"${VERSION_GDKPIXBUF}\",\n\
-  \"gif\": \"${VERSION_GIF}\",\n\
-  \"glib\": \"${VERSION_GLIB}\",\n\
-  \"gsf\": \"${VERSION_GSF}\",\n\
-  \"harfbuzz\": \"${VERSION_HARFBUZZ}\",\n\
-  \"jpeg\": \"${VERSION_JPEG}\",\n\
-  \"lcms\": \"${VERSION_LCMS2}\",\n\
-  \"orc\": \"${VERSION_ORC}\",\n\
-  \"pango\": \"${VERSION_PANGO}\",\n\
-  \"pixman\": \"${VERSION_PIXMAN}\",\n\
-  \"png\": \"${VERSION_PNG16}\",\n\
-  \"svg\": \"${VERSION_SVG}\",\n\
-  \"tiff\": \"${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
-tar czf /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz include lib
-advdef --recompress --shrink-insane /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz

packaging/build/win.sh

@@ -1,19 +0,0 @@
-#!/bin/sh
-set -e
-
-# Fetch and unzip
-mkdir /vips
-cd /vips
-curl -L -O https://github.com/lovell/build-win64/releases/download/v${VERSION_VIPS}/vips-dev-w64-web-${VERSION_VIPS}.zip
-unzip vips-dev-w64-web-${VERSION_VIPS}.zip
-
-# Clean and zip
-cd /vips/vips-dev-8.3
-rm bin/libvipsCC-42.dll bin/libvips-cpp-42.dll bin/libgsf-win32-1-114.dll
-cp bin/*.dll lib/
-cp -r lib64/* lib/
-
-echo "Creating tarball"
-tar czf /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz include lib/glib-2.0 lib/libvips.lib lib/libglib-2.0.lib lib/libgobject-2.0.lib lib/*.dll
-echo "Shrinking tarball"
-advdef --recompress --shrink-insane /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz

packaging/linux-armv6/Dockerfile

@@ -1,15 +0,0 @@
-FROM socialdefect/raspbian-jessie-core
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-# Create Rasbian-based container suitable for compiling Linux ARMv6 binaries
-# Requires the QEMU user mode emulation binaries on the host machine
-
-# Build dependencies
-RUN \
-  apt-get update && \
-  apt-get install -y build-essential curl autoconf libtool nasm gtk-doc-tools texinfo advancecomp libglib2.0-dev
-
-# Compiler settings
-ENV \
-  PLATFORM=linux-armv6 \
-  FLAGS="-Os"

packaging/linux-armv7/Dockerfile

@@ -1,20 +0,0 @@
-FROM debian:jessie
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-# Create Debian-based container suitable for cross-compiling Linux ARMv7-A binaries
-
-# Build dependencies
-RUN \
-  apt-get update && \
-  apt-get install -y curl && \
-  echo "deb http://emdebian.org/tools/debian/ jessie main" | tee /etc/apt/sources.list.d/crosstools.list && \
-  curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | apt-key add - && \
-  dpkg --add-architecture armhf && \
-  apt-get update && \
-  apt-get install -y crossbuild-essential-armhf autoconf libtool nasm gtk-doc-tools texinfo advancecomp libglib2.0-dev
-
-# Compiler settings
-ENV \
-  PLATFORM=linux-armv7 \
-  CHOST=arm-linux-gnueabihf \
-  FLAGS="-marm -march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard -Os"

packaging/linux-armv8/Dockerfile

@@ -1,18 +0,0 @@
-FROM debian:stretch
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-# Create Debian-based container suitable for cross-compiling Linux ARMv8-A binaries
-
-# Build dependencies
-RUN \
-  apt-get update && \
-  apt-get install -y curl && \
-  dpkg --add-architecture arm64 && \
-  apt-get update && \
-  apt-get install -y crossbuild-essential-arm64 autoconf libtool nasm gtk-doc-tools texinfo advancecomp libglib2.0-dev
-
-# Compiler settings
-ENV \
-  PLATFORM=linux-armv8 \
-  CHOST=aarch64-linux-gnu \
-  FLAGS="-march=armv8-a -Os -D_GLIBCXX_USE_CXX11_ABI=0"

packaging/linux-x64/Dockerfile

@@ -1,14 +0,0 @@
-FROM debian:wheezy
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-# Create Debian-based container suitable for building Linux x64 binaries
-
-# Build dependencies
-RUN \
-  apt-get update && \
-  apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo advancecomp
-
-# Compiler settings
-ENV \
-  PLATFORM="linux-x64" \
-  FLAGS="-O3"

packaging/test-linux-arm.sh

@@ -1,28 +0,0 @@
-#!/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 $IP"
-  exit 1
-fi
-
-if ! type sshpass >/dev/null; then
-  echo "Please install sshpass"
-  exit 1
-fi
-
-export SSHPASS=hypriot
-
-echo "Copying sharp source to device"
-sshpass -e scp -o PreferredAuthentications=password -r ../../sharp pirate@${IP}:/home/pirate/sharp
-
-echo "Compile and test within container"
-sshpass -e ssh -o PreferredAuthentications=password -t pirate@${IP} "docker run --rm -v \${PWD}/sharp:/s hypriot/rpi-node:6 sh -c 'cd /s && npm install --unsafe-perm && npm test'"

packaging/test-linux-x64.sh

@@ -1,56 +0,0 @@
-#!/bin/sh
-
-# Verify docker is available
-if ! type docker >/dev/null; then
-  echo "Please install docker"
-  exit 1
-fi
-
-version_node=6.3.0
-
-test="npm run clean; npm install --unsafe-perm; npm test"
-
-# Debian 7, 8
-# Ubuntu 14.04
-for dist in wheezy jessie trusty; do
-  echo "Testing $dist..."
-  if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/$dist:$version_node >packaging/$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 7
-echo "Testing centos7..."
-if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/centos7:$version_node >packaging/$dist.log 2>&1 sh -c "cd /v; $test";
-then echo "centos7 OK"
-else echo "centos7 fail" && cat packaging/$dist.log
-fi
-
-# Fedora 22
-echo "Testing fedora22..."
-if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/fedora22:$version_node >packaging/$dist.log 2>&1 sh -c "cd /v; $test";
-then echo "fedora22 OK"
-else echo "fedora22 fail" && cat packaging/$dist.log
-fi
-
-# 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 pritunl/archlinux:latest >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

@@ -1,7 +0,0 @@
-#!/bin/sh
-
-# Install build dependencies
-apk add --update make gcc g++ python nodejs
-
-# Install libvips from aports/testing
-apk add --update --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing vips-dev

packaging/test/archlinux.sh

@@ -1,5 +0,0 @@
-#!/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/debian.sh

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

packaging/test/opensuse.sh

@@ -1,7 +0,0 @@
-#!/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 npm
-npm install -g npm

packaging/win32-x64/Dockerfile

@@ -1,8 +0,0 @@
-FROM debian:jessie
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-# Create Debian-based container suitable for post-processing Windows x64 binaries
-
-RUN apt-get update && apt-get install -y curl zip advancecomp
-
-ENV PLATFORM=win32-x64

preinstall.sh

@@ -1,316 +0,0 @@
-#!/bin/sh
-
-# Use of this script is deprecated
-
-echo
-echo "WARNING: This script will stop working at the end of 2016"
-echo
-echo "WARNING: This script is no longer required on most 64-bit Linux systems when using sharp v0.12.0+"
-echo
-echo "See http://sharp.dimens.io/page/install#linux"
-echo
-echo "If you really, really need this script, it will attempt"
-echo "to globally install libvips if not already available."
-echo
-sleep 5
-
-vips_version_minimum=8.3.3
-vips_version_latest_major_minor=8.3
-vips_version_latest_patch=3
-
-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
-  CXXFLAGS="-D_GLIBCXX_USE_CXX11_ABI=0" ./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|xenial)
-        # 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

@@ -1,12 +1,29 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #include <cstdlib>
 #include <string>
 #include <string.h>
+#include <vector>
+#include <queue>
+#include <mutex>
 
 #include <node.h>
 #include <node_buffer.h>
+#include <nan.h>
 #include <vips/vips8>
 
-#include "nan.h"
 #include "common.h"
 
 using vips::VImage;
@@ -23,18 +40,19 @@ namespace sharp {
 
   // Create an InputDescriptor instance from a v8::Object describing an input image
   InputDescriptor* CreateInputDescriptor(
-    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> buffersToPersist
+    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> &buffersToPersist
   ) {
     Nan::HandleScope();
     InputDescriptor *descriptor = new InputDescriptor;
     if (HasAttr(input, "file")) {
       descriptor->file = AttrAsStr(input, "file");
-    } else {
+    } else if (HasAttr(input, "buffer")) {
       v8::Local<v8::Object> buffer = AttrAs<v8::Object>(input, "buffer");
       descriptor->bufferLength = node::Buffer::Length(buffer);
       descriptor->buffer = node::Buffer::Data(buffer);
       buffersToPersist.push_back(buffer);
     }
+    descriptor->failOnError = AttrTo<bool>(input, "failOnError");
     // Density for vector-based input
     if (HasAttr(input, "density")) {
       descriptor->density = AttrTo<uint32_t>(input, "density");
@@ -45,6 +63,20 @@ namespace sharp {
       descriptor->rawWidth = AttrTo<uint32_t>(input, "rawWidth");
       descriptor->rawHeight = AttrTo<uint32_t>(input, "rawHeight");
     }
+    // Page input for multi-page TIFF
+    if (HasAttr(input, "page")) {
+      descriptor->page = AttrTo<uint32_t>(input, "page");
+    }
+    // Create new image
+    if (HasAttr(input, "createChannels")) {
+      descriptor->createChannels = AttrTo<uint32_t>(input, "createChannels");
+      descriptor->createWidth = AttrTo<uint32_t>(input, "createWidth");
+      descriptor->createHeight = AttrTo<uint32_t>(input, "createHeight");
+      v8::Local<v8::Object> createBackground = AttrAs<v8::Object>(input, "createBackground");
+      for (unsigned int i = 0; i < 4; i++) {
+        descriptor->createBackground[i] = AttrTo<double>(createBackground, i);
+      }
+    }
     return descriptor;
   }
 
@@ -177,7 +209,6 @@ namespace sharp {
     VImage image;
     ImageType imageType;
     if (descriptor->buffer != nullptr) {
-      // From buffer
       if (descriptor->rawChannels > 0) {
         // Raw, uncompressed pixel data
         image = VImage::new_from_memory(descriptor->buffer, descriptor->bufferLength,
@@ -193,13 +224,18 @@ namespace sharp {
         imageType = DetermineImageType(descriptor->buffer, descriptor->bufferLength);
         if (imageType != ImageType::UNKNOWN) {
           try {
-            vips::VOption *option = VImage::option()->set("access", accessMethod);
+            vips::VOption *option = VImage::option()
+              ->set("access", accessMethod)
+              ->set("fail", descriptor->failOnError);
             if (imageType == ImageType::SVG || imageType == ImageType::PDF) {
               option->set("dpi", static_cast<double>(descriptor->density));
             }
             if (imageType == ImageType::MAGICK) {
               option->set("density", std::to_string(descriptor->density).data());
             }
+            if (imageType == ImageType::TIFF) {
+             option->set("page", descriptor->page);
+            }
             image = VImage::new_from_buffer(descriptor->buffer, descriptor->bufferLength, nullptr, option);
             if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
               SetDensity(image, descriptor->density);
@@ -212,26 +248,46 @@ namespace sharp {
         }
       }
     } else {
-      // From filesystem
-      imageType = DetermineImageType(descriptor->file.data());
-      if (imageType != ImageType::UNKNOWN) {
-        try {
-          vips::VOption *option = VImage::option()->set("access", accessMethod);
-          if (imageType == ImageType::SVG || imageType == ImageType::PDF) {
-            option->set("dpi", static_cast<double>(descriptor->density));
-          }
-          if (imageType == ImageType::MAGICK) {
-            option->set("density", std::to_string(descriptor->density).data());
-          }
-          image = VImage::new_from_file(descriptor->file.data(), option);
-          if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
-            SetDensity(image, descriptor->density);
-          }
-        } catch (...) {
-          throw vips::VError("Input file has corrupt header");
+      if (descriptor->createChannels > 0) {
+        // Create new image
+        std::vector<double> background = {
+          descriptor->createBackground[0],
+          descriptor->createBackground[1],
+          descriptor->createBackground[2]
+        };
+        if (descriptor->createChannels == 4) {
+          background.push_back(descriptor->createBackground[3]);
         }
+        image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight).new_from_image(background);
+        image.get_image()->Type = VIPS_INTERPRETATION_sRGB;
+        imageType = ImageType::RAW;
       } else {
-        throw vips::VError("Input file is missing or of an unsupported image format");
+        // From filesystem
+        imageType = DetermineImageType(descriptor->file.data());
+        if (imageType != ImageType::UNKNOWN) {
+          try {
+            vips::VOption *option = VImage::option()
+              ->set("access", accessMethod)
+              ->set("fail", descriptor->failOnError);
+            if (imageType == ImageType::SVG || imageType == ImageType::PDF) {
+              option->set("dpi", static_cast<double>(descriptor->density));
+            }
+            if (imageType == ImageType::MAGICK) {
+              option->set("density", std::to_string(descriptor->density).data());
+            }
+            if (imageType == ImageType::TIFF) {
+             option->set("page", descriptor->page);
+            }
+            image = VImage::new_from_file(descriptor->file.data(), option);
+            if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
+              SetDensity(image, descriptor->density);
+            }
+          } catch (...) {
+            throw vips::VError("Input file has corrupt header");
+          }
+        } else {
+          throw vips::VError("Input file is missing or of an unsupported image format");
+        }
       }
     }
     return std::make_tuple(image, imageType);
@@ -254,8 +310,7 @@ namespace sharp {
     return (
       (bands == 2 && interpretation == VIPS_INTERPRETATION_B_W) ||
       (bands == 4 && interpretation != VIPS_INTERPRETATION_CMYK) ||
-      (bands == 5 && interpretation == VIPS_INTERPRETATION_CMYK)
-    );
+      (bands == 5 && interpretation == VIPS_INTERPRETATION_CMYK));
   }
 
   /*
@@ -263,11 +318,8 @@ namespace sharp {
   */
   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]);
-      }
+    if (image.get_typeof(VIPS_META_ORIENTATION) != 0) {
+      orientation = image.get_int(VIPS_META_ORIENTATION);
     }
     return orientation;
   }
@@ -276,16 +328,14 @@ namespace sharp {
     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);
+    image.set(VIPS_META_ORIENTATION, orientation);
   }
 
   /*
     Remove EXIF Orientation from image.
   */
   void RemoveExifOrientation(VImage image) {
-    SetExifOrientation(image, 0);
+    vips_image_remove(image.get_image(), VIPS_META_ORIENTATION);
   }
 
   /*
@@ -312,6 +362,25 @@ namespace sharp {
     image.set(VIPS_META_RESOLUTION_UNIT, "in");
   }
 
+  /*
+    Check the proposed format supports the current dimensions.
+  */
+  void AssertImageTypeDimensions(VImage image, ImageType const imageType) {
+    if (imageType == ImageType::JPEG) {
+      if (image.width() > 65535 || image.height() > 65535) {
+        throw vips::VError("Processed image is too large for the JPEG format");
+      }
+    } else if (imageType == ImageType::PNG) {
+      if (image.width() > 2147483647 || image.height() > 2147483647) {
+        throw vips::VError("Processed image is too large for the PNG format");
+      }
+    } else if (imageType == ImageType::WEBP) {
+      if (image.width() > 16383 || image.height() > 16383) {
+        throw vips::VError("Processed image is too large for the WebP format");
+      }
+    }
+  }
+
   /*
     Called when a Buffer undergoes GC, required to support mixed runtime libraries in Windows
   */
@@ -321,9 +390,91 @@ namespace sharp {
     }
   }
 
+  /*
+    Temporary buffer of warnings
+  */
+  std::queue<std::string> vipsWarnings;
+  std::mutex vipsWarningsMutex;
+
+  /*
+    Called with warnings from the glib-registered "VIPS" domain
+  */
+  void VipsWarningCallback(char const* log_domain, GLogLevelFlags log_level, char const* message, void* ignore) {
+    std::lock_guard<std::mutex> lock(vipsWarningsMutex);
+    vipsWarnings.emplace(message);
+  }
+
+  /*
+    Pop the oldest warning message from the queue
+  */
+  std::string VipsWarningPop() {
+    std::string warning;
+    std::lock_guard<std::mutex> lock(vipsWarningsMutex);
+    if (!vipsWarnings.empty()) {
+      warning = vipsWarnings.front();
+      vipsWarnings.pop();
+    }
+    return warning;
+  }
+
   /*
     Calculate the (left, top) coordinates of the output image
-    within the input image, applying the given gravity.
+    within the input image, applying the given gravity during an embed.
+
+    @Azurebyte: We are basically swapping the inWidth and outWidth, inHeight and outHeight from the CalculateCrop function.
+  */
+  std::tuple<int, int> CalculateEmbedPosition(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 = (outWidth - inWidth) / 2;
+        break;
+      case 2:
+        // East
+        left = outWidth - inWidth;
+        top = (outHeight - inHeight) / 2;
+        break;
+      case 3:
+        // South
+        left = (outWidth - inWidth) / 2;
+        top = outHeight - inHeight;
+        break;
+      case 4:
+        // West
+        top = (outHeight - inHeight) / 2;
+        break;
+      case 5:
+        // Northeast
+        left = outWidth - inWidth;
+        break;
+      case 6:
+        // Southeast
+        left = outWidth - inWidth;
+        top = outHeight - inHeight;
+        break;
+      case 7:
+        // Southwest
+        top = outHeight - inHeight;
+        break;
+      case 8:
+        // Northwest
+        // Which is the default is 0,0 so we do not assign anything here.
+        break;
+      default:
+        // Centre
+        left = (outWidth - inWidth) / 2;
+        top = (outHeight - inHeight) / 2;
+    }
+    return std::make_tuple(left, top);
+  }
+
+  /*
+    Calculate the (left, top) coordinates of the output image
+    within the input image, applying the given gravity during a crop.
   */
   std::tuple<int, int> CalculateCrop(int const inWidth, int const inHeight,
     int const outWidth, int const outHeight, int const gravity) {
@@ -357,9 +508,11 @@ namespace sharp {
         // Southeast
         left = inWidth - outWidth;
         top = inHeight - outHeight;
+        break;
       case 7:
         // Southwest
         top = inHeight - outHeight;
+        break;
       case 8:
         // Northwest
         break;
@@ -383,23 +536,23 @@ namespace sharp {
     int top = 0;
 
     // assign only if valid
-    if(x >= 0 && x < (inWidth - outWidth)) {
+    if (x >= 0 && x < (inWidth - outWidth)) {
       left = x;
-    } else if(x >= (inWidth - outWidth)) {
+    } else if (x >= (inWidth - outWidth)) {
       left = inWidth - outWidth;
     }
 
-    if(y >= 0 && y < (inHeight - outHeight)) {
+    if (y >= 0 && y < (inHeight - outHeight)) {
       top = y;
-    } else if(y >= (inHeight - outHeight)) {
+    } else if (y >= (inHeight - outHeight)) {
       top = inHeight - outHeight;
     }
 
     // the resulting left and top could have been outside the image after calculation from bottom/right edges
-    if(left < 0) {
+    if (left < 0) {
       left = 0;
     }
-    if(top < 0) {
+    if (top < 0) {
       top = 0;
     }
 
@@ -426,8 +579,7 @@ namespace sharp {
   */
   VipsOperationBoolean GetBooleanOperation(std::string const opStr) {
     return static_cast<VipsOperationBoolean>(
-      vips_enum_from_nick(nullptr, VIPS_TYPE_OPERATION_BOOLEAN, opStr.data())
-    );
+      vips_enum_from_nick(nullptr, VIPS_TYPE_OPERATION_BOOLEAN, opStr.data()));
   }
 
   /*
@@ -435,8 +587,23 @@ namespace sharp {
   */
   VipsInterpretation GetInterpretation(std::string const typeStr) {
     return static_cast<VipsInterpretation>(
-      vips_enum_from_nick(nullptr, VIPS_TYPE_INTERPRETATION, typeStr.data())
-    );
+      vips_enum_from_nick(nullptr, VIPS_TYPE_INTERPRETATION, typeStr.data()));
+  }
+
+  /*
+    Convert RGBA value to another colourspace
+  */
+  std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba, VipsInterpretation const interpretation) {
+    int const bands = static_cast<int>(rgba.size());
+    if (bands < 3 || interpretation == VIPS_INTERPRETATION_sRGB || interpretation == VIPS_INTERPRETATION_RGB) {
+      return rgba;
+    } else {
+      VImage pixel = VImage::new_matrix(1, 1);
+      pixel.set("bands", bands);
+      pixel = pixel.new_from_image(rgba);
+      pixel = pixel.colourspace(interpretation, VImage::option()->set("source_space", VIPS_INTERPRETATION_sRGB));
+      return pixel(0, 0);
+    }
   }
 
 }  // namespace sharp

src/common.h

@@ -1,32 +1,44 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #ifndef SRC_COMMON_H_
 #define SRC_COMMON_H_
 
 #include <string>
 #include <tuple>
+#include <vector>
 
 #include <node.h>
+#include <nan.h>
 #include <vips/vips8>
 
-#include "nan.h"
-
 // Verify platform and compiler compatibility
 
-#if (VIPS_MAJOR_VERSION < 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 3))
-#error libvips version 8.3.x required - see sharp.dimens.io/page/install
+#if (VIPS_MAJOR_VERSION < 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 6))
+#error libvips version 8.6.1+ is required - see sharp.pixelplumbing.com/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 sharp.dimens.io/page/install#prerequisites
+#error GCC version 4.6+ is required for C++11 features - see sharp.pixelplumbing.com/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 sharp.dimens.io/page/install#prerequisites
+#error clang version 3.0+ is required for C++11 features - see sharp.pixelplumbing.com/page/install#prerequisites
 #endif
 #endif
 
-#define EXIF_IFD0_ORIENTATION "exif-ifd0-Orientation"
-
 using vips::VImage;
 
 namespace sharp {
@@ -35,19 +47,35 @@ namespace sharp {
     std::string name;
     std::string file;
     char *buffer;
+    bool failOnError;
     size_t bufferLength;
     int density;
     int rawChannels;
     int rawWidth;
     int rawHeight;
+    int page;
+    int createChannels;
+    int createWidth;
+    int createHeight;
+    double createBackground[4];
 
     InputDescriptor():
       buffer(nullptr),
+      failOnError(FALSE),
       bufferLength(0),
       density(72),
       rawChannels(0),
       rawWidth(0),
-      rawHeight(0) {}
+      rawHeight(0),
+      page(0),
+      createChannels(0),
+      createWidth(0),
+      createHeight(0) {
+        createBackground[0] = 0.0;
+        createBackground[1] = 0.0;
+        createBackground[2] = 0.0;
+        createBackground[3] = 255.0;
+      }
   };
 
   // Convenience methods to access the attributes of a v8::Object
@@ -65,8 +93,7 @@ namespace sharp {
 
   // Create an InputDescriptor instance from a v8::Object describing an input image
   InputDescriptor* CreateInputDescriptor(
-    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> buffersToPersist
-  );
+    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> &buffersToPersist);
 
   enum class ImageType {
     JPEG,
@@ -161,11 +188,33 @@ namespace sharp {
   */
   void SetDensity(VImage image, const int density);
 
+  /*
+    Check the proposed format supports the current dimensions.
+  */
+  void AssertImageTypeDimensions(VImage image, ImageType const imageType);
+
   /*
     Called when a Buffer undergoes GC, required to support mixed runtime libraries in Windows
   */
   void FreeCallback(char* data, void* hint);
 
+  /*
+    Called with warnings from the glib-registered "VIPS" domain
+  */
+  void VipsWarningCallback(char const* log_domain, GLogLevelFlags log_level, char const* message, void* ignore);
+
+  /*
+    Pop the oldest warning message from the queue
+  */
+  std::string VipsWarningPop();
+
+  /*
+    Calculate the (left, top) coordinates of the output image
+    within the input image, applying the given gravity during an embed.
+  */
+  std::tuple<int, int> CalculateEmbedPosition(int const inWidth, int const inHeight,
+    int const outWidth, int const outHeight, int const gravity);
+
   /*
     Calculate the (left, top) coordinates of the output image
     within the input image, applying the given gravity.
@@ -201,6 +250,11 @@ namespace sharp {
   */
   VipsInterpretation GetInterpretation(std::string const typeStr);
 
+  /*
+    Convert RGBA value to another colourspace
+  */
+  std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba, VipsInterpretation const interpretation);
+
 }  // namespace sharp
 
 #endif  // SRC_COMMON_H_

src/libvips/cplusplus/VImage.cpp

@@ -2,6 +2,10 @@
  *
  * 30/12/14
  * 	- allow set enum value from string
+ * 10/6/16
+ * 	- missing implementation of VImage::write()
+ * 11/6/16
+ * 	- added arithmetic assignment overloads, += etc. 
  */
 
 /*
@@ -201,6 +205,30 @@ VOption::set( const char *name, std::vector<double> value )
 	return( this );
 }
 
+// input int array
+VOption *
+VOption::set( const char *name, std::vector<int> value )
+{
+	Pair *pair = new Pair( name );
+
+	int *array;
+	unsigned int i; 
+
+	pair->input = true;
+
+	g_value_init( &pair->value, VIPS_TYPE_ARRAY_INT );
+	vips_value_set_array_int( &pair->value, NULL,
+		static_cast< int >( value.size() ) );
+	array = vips_value_get_array_int( &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 )
@@ -346,7 +374,7 @@ set_property( VipsObject *object, const char *name, const GValue *value )
 
 	if( vips_object_get_argument( object, name, 
 		&pspec, &argument_class, &argument_instance ) ) {
-		vips_warn( NULL, "%s", vips_error_buffer() );
+		g_warning( "%s", vips_error_buffer() );
 		vips_error_clear();
 		return;
 	}
@@ -360,7 +388,7 @@ set_property( VipsObject *object, const char *name, const GValue *value )
 
 		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() );
+			g_warning( "%s", vips_error_buffer() );
 			vips_error_clear();
 			return;
 		}
@@ -457,12 +485,11 @@ VImage::call_option_string( const char *operation_name,
 {
 	VipsOperation *operation;
 
-	VIPS_DEBUG_MSG( "vips_call_by_name: starting for %s ...\n", 
+	VIPS_DEBUG_MSG( "call_option_string: starting for %s ...\n", 
 		operation_name );
 
 	if( !(operation = vips_operation_new( operation_name )) ) {
-		if( options )
-			delete options;
+		delete options;
 		throw( VError() ); 
 	}
 
@@ -485,6 +512,7 @@ VImage::call_option_string( const char *operation_name,
 	 */
 	if( vips_cache_operation_buildp( &operation ) ) {
 		vips_object_unref_outputs( VIPS_OBJECT( operation ) );
+		g_object_unref( operation ); 
 		delete options; 
 		throw( VError() ); 
 	}
@@ -560,34 +588,6 @@ VImage::new_from_buffer( void *buf, size_t len, const char *option_string,
 	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 ) 
 {
@@ -612,6 +612,15 @@ VImage::new_matrixv( int width, int height, ... )
 	return( matrix ); 
 }
 
+VImage
+VImage::write( VImage out )
+{
+	if( vips_image_write( this->get_image(), out.get_image() ) )
+		throw VError(); 
+
+	return( out ); 
+}
+
 void 
 VImage::write_to_file( const char *name, VOption *options )
 {
@@ -679,10 +688,21 @@ VImage::bandsplit( VOption *options )
 VImage 
 VImage::bandjoin( VImage other, VOption *options )
 {
-    VImage v[2] = { *this, other }; 
-    std::vector<VImage> vec( v, v + VIPS_NUMBER( v ) );
+	VImage v[2] = { *this, other }; 
+	std::vector<VImage> vec( v, v + VIPS_NUMBER( v ) );
 
-    return( bandjoin( vec, options ) ); 
+	return( bandjoin( vec, options ) ); 
+}
+
+VImage 
+VImage::composite( VImage other, VipsBlendMode mode, VOption *options )
+{
+	VImage v[2] = { *this, other }; 
+	std::vector<VImage> ivec( v, v + VIPS_NUMBER( v ) );
+	int m[1] = { static_cast<int>( mode ) }; 
+	std::vector<int> mvec( m, m + VIPS_NUMBER( m ) );
+
+	return( composite( ivec, mvec, options ) ); 
 }
 
 std::complex<double> 
@@ -755,13 +775,32 @@ operator+( VImage a, std::vector<double> b )
 	return( a.linear( 1.0, b ) ); 
 }
 
+VImage & 
+operator+=( VImage &a, const VImage b )
+{
+	return( a = a + b ); 
+}
+
+VImage & 
+operator+=( VImage &a, const double b )
+{
+	return( a = a + b ); 
+}
+
+VImage & 
+operator+=( VImage &a, std::vector<double> b )
+{
+	return( a = a + b ); 
+}
+
 VImage 
 operator-( VImage a, VImage b ) 
 {
 	return( a.subtract( b ) );
 }
 
-VImage operator-( double a, VImage b ) 
+VImage 
+operator-( double a, VImage b ) 
 {
 	return( b.linear( -1.0, a ) ); 
 }
@@ -784,6 +823,24 @@ operator-( VImage a, std::vector<double> b )
 	return( a.linear( 1.0, vips::negate( b ) ) ); 
 }
 
+VImage & 
+operator-=( VImage &a, const VImage b )
+{
+	return( a = a - b ); 
+}
+
+VImage & 
+operator-=( VImage &a, const double b )
+{
+	return( a = a - b ); 
+}
+
+VImage & 
+operator-=( VImage &a, std::vector<double> b )
+{
+	return( a = a - b ); 
+}
+
 VImage 
 operator-( VImage a ) 
 { 
@@ -820,6 +877,24 @@ operator*( VImage a, std::vector<double> b )
 	return( a.linear( b, 0.0 ) ); 
 }
 
+VImage & 
+operator*=( VImage &a, const VImage b )
+{
+	return( a = a * b ); 
+}
+
+VImage & 
+operator*=( VImage &a, const double b )
+{
+	return( a = a * b ); 
+}
+
+VImage & 
+operator*=( VImage &a, std::vector<double> b )
+{
+	return( a = a * b ); 
+}
+
 VImage 
 operator/( VImage a, VImage b ) 
 {
@@ -850,6 +925,24 @@ operator/( VImage a, std::vector<double> b )
 	return( a.linear( vips::invert( b ), 0.0 ) ); 
 }
 
+VImage & 
+operator/=( VImage &a, const VImage b )
+{
+	return( a = a / b ); 
+}
+
+VImage & 
+operator/=( VImage &a, const double b )
+{
+	return( a = a / b ); 
+}
+
+VImage & 
+operator/=( VImage &a, std::vector<double> b )
+{
+	return( a = a / b ); 
+}
+
 VImage 
 operator%( VImage a, VImage b ) 
 {
@@ -868,6 +961,24 @@ operator%( VImage a, std::vector<double> b )
 	return( a.remainder_const( b ) ); 
 }
 
+VImage & 
+operator%=( VImage &a, const VImage b )
+{
+	return( a = a % b ); 
+}
+
+VImage & 
+operator%=( VImage &a, const double b )
+{
+	return( a = a % b ); 
+}
+
+VImage & 
+operator%=( VImage &a, std::vector<double> b )
+{
+	return( a = a % b ); 
+}
+
 VImage 
 operator<( VImage a, VImage b ) 
 {
@@ -877,29 +988,29 @@ operator<( VImage a, VImage b )
 VImage 
 operator<( double a, VImage b ) 
 {
-	return( b.relational_const( to_vector( a ), 
-		VIPS_OPERATION_RELATIONAL_MORE ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_MORE, 
+		to_vector( a ) ) ); 
 }
 
 VImage 
 operator<( VImage a, double b ) 
 { 
-	return( a.relational_const( to_vector( b ), 
-		VIPS_OPERATION_RELATIONAL_LESS ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_LESS, 
+		to_vector( b ) ) );  
 }
 
 VImage 
 operator<( std::vector<double> a, VImage b ) 
 {
-	return( b.relational_const( a, 
-		VIPS_OPERATION_RELATIONAL_MORE ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_MORE, 
+		a ) );  
 }
 
 VImage 
 operator<( VImage a, std::vector<double> b ) 
 { 
-	return( a.relational_const( b, 
-		VIPS_OPERATION_RELATIONAL_LESS ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_LESS, 
+		b ) ); 
 }
 
 VImage 
@@ -911,29 +1022,29 @@ operator<=( VImage a, VImage b )
 VImage 
 operator<=( double a, VImage b ) 
 {
-	return( b.relational_const( to_vector( a ), 
-		VIPS_OPERATION_RELATIONAL_MOREEQ ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_MOREEQ, 
+		to_vector( a ) ) );  
 }
 
 VImage 
 operator<=( VImage a, double b ) 
 { 
-	return( a.relational_const( to_vector( b ), 
-		VIPS_OPERATION_RELATIONAL_LESSEQ ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_LESSEQ, 
+		to_vector( b ) ) );  
 }
 
 VImage 
 operator<=( std::vector<double> a, VImage b ) 
 {
-	return( b.relational_const( a, 
-		VIPS_OPERATION_RELATIONAL_MOREEQ ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_MOREEQ, 
+		a ) );
 }
 
 VImage 
 operator<=( VImage a, std::vector<double> b ) 
 { 
-	return( a.relational_const( b, 
-		VIPS_OPERATION_RELATIONAL_LESSEQ ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_LESSEQ,
+		b ) );
 }
 
 VImage 
@@ -945,29 +1056,29 @@ operator>( VImage a, VImage b )
 VImage 
 operator>( double a, VImage b ) 
 {
-	return( b.relational_const( to_vector( a ), 
-		VIPS_OPERATION_RELATIONAL_LESS ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_LESS, 
+		to_vector( a ) ) ); 
 }
 
 VImage 
 operator>( VImage a, double b ) 
 { 
-	return( a.relational_const( to_vector( b ), 
-		VIPS_OPERATION_RELATIONAL_MORE ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_MORE, 
+		to_vector( b ) ) );
 }
 
 VImage 
 operator>( std::vector<double> a, VImage b ) 
 {
-	return( b.relational_const( a, 
-		VIPS_OPERATION_RELATIONAL_LESS ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_LESS, 
+		a ) );
 }
 
 VImage 
 operator>( VImage a, std::vector<double> b ) 
 { 
-	return( a.relational_const( b, 
-		VIPS_OPERATION_RELATIONAL_MORE ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_MORE, 
+		b ) );
 }
 
 VImage 
@@ -979,29 +1090,29 @@ operator>=( VImage a, VImage b )
 VImage 
 operator>=( double a, VImage b ) 
 {
-	return( b.relational_const( to_vector( a ), 
-		VIPS_OPERATION_RELATIONAL_LESSEQ ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_LESSEQ, 
+		to_vector( a ) ) );  
 }
 
 VImage 
 operator>=( VImage a, double b ) 
 { 
-	return( a.relational_const( to_vector( b ), 
-		VIPS_OPERATION_RELATIONAL_MOREEQ ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_MOREEQ, 
+		to_vector( b ) ) ); 
 }
 
 VImage 
 operator>=( std::vector<double> a, VImage b ) 
 {
-	return( b.relational_const( a, 
-		VIPS_OPERATION_RELATIONAL_LESSEQ ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_LESSEQ, 
+		a ) );
 }
 
 VImage 
 operator>=( VImage a, std::vector<double> b ) 
 { 
-	return( a.relational_const( b, 
-		VIPS_OPERATION_RELATIONAL_MOREEQ ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_MOREEQ, 
+		b ) );
 }
 
 VImage 
@@ -1013,29 +1124,29 @@ operator==( VImage a, VImage b )
 VImage 
 operator==( double a, VImage b ) 
 {
-	return( b.relational_const( to_vector( a ), 
-		VIPS_OPERATION_RELATIONAL_EQUAL ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_EQUAL, 
+		to_vector( a ) ) );
 }
 
 VImage 
 operator==( VImage a, double b ) 
 { 
-	return( a.relational_const( to_vector( b ), 
-		VIPS_OPERATION_RELATIONAL_EQUAL ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_EQUAL, 
+		to_vector( b ) ) );
 }
 
 VImage 
 operator==( std::vector<double> a, VImage b ) 
 {
-	return( b.relational_const( a, 
-		VIPS_OPERATION_RELATIONAL_EQUAL ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_EQUAL, 
+		a ) );
 }
 
 VImage 
 operator==( VImage a, std::vector<double> b ) 
 { 
-	return( a.relational_const( b, 
-		VIPS_OPERATION_RELATIONAL_EQUAL ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_EQUAL, 
+		b ) );
 }
 
 VImage 
@@ -1047,29 +1158,29 @@ operator!=( VImage a, VImage b )
 VImage 
 operator!=( double a, VImage b ) 
 {
-	return( b.relational_const( to_vector( a ), 
-		VIPS_OPERATION_RELATIONAL_NOTEQ ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_NOTEQ,
+		to_vector( a ) ) );  
 }
 
 VImage 
 operator!=( VImage a, double b ) 
 { 
-	return( a.relational_const( to_vector( b ), 
-		VIPS_OPERATION_RELATIONAL_NOTEQ ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_NOTEQ, 
+		to_vector( b ) ) );
 }
 
 VImage 
 operator!=( std::vector<double> a, VImage b ) 
 {
-	return( b.relational_const( a, 
-		VIPS_OPERATION_RELATIONAL_NOTEQ ) );
+	return( b.relational_const( VIPS_OPERATION_RELATIONAL_NOTEQ,
+		a ) );
 }
 
 VImage 
 operator!=( VImage a, std::vector<double> b ) 
 { 
-	return( a.relational_const( b, 
-		VIPS_OPERATION_RELATIONAL_NOTEQ ) );
+	return( a.relational_const( VIPS_OPERATION_RELATIONAL_NOTEQ,
+		b ) );
 }
 
 VImage 
@@ -1081,27 +1192,45 @@ operator&( VImage a, VImage b )
 VImage 
 operator&( double a, VImage b ) 
 {
-	return( b.boolean_const( to_vector( a ), 
-		VIPS_OPERATION_BOOLEAN_AND ) );
+	return( b.boolean_const( VIPS_OPERATION_BOOLEAN_AND, 
+		to_vector( a ) ) );  
 }
 
 VImage 
 operator&( VImage a, double b ) 
 { 
-	return( a.boolean_const( to_vector( b ), 
-		VIPS_OPERATION_BOOLEAN_AND ) );
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_AND, 
+		to_vector( b ) ) );
 }
 
 VImage 
 operator&( std::vector<double> a, VImage b ) 
 {
-	return( b.boolean_const( a, VIPS_OPERATION_BOOLEAN_AND ) );
+	return( b.boolean_const( VIPS_OPERATION_BOOLEAN_AND, a ) );
 }
 
 VImage 
 operator&( VImage a, std::vector<double> b ) 
 { 
-	return( a.boolean_const( b, VIPS_OPERATION_BOOLEAN_AND ) );
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_AND, b ) );
+}
+
+VImage & 
+operator&=( VImage &a, const VImage b )
+{
+	return( a = a & b ); 
+}
+
+VImage & 
+operator&=( VImage &a, const double b )
+{
+	return( a = a & b ); 
+}
+
+VImage & 
+operator&=( VImage &a, std::vector<double> b )
+{
+	return( a = a & b ); 
 }
 
 VImage 
@@ -1113,27 +1242,47 @@ operator|( VImage a, VImage b )
 VImage 
 operator|( double a, VImage b ) 
 {
-	return( b.boolean_const( to_vector( a ), 
-		VIPS_OPERATION_BOOLEAN_OR ) );
+	return( b.boolean_const( VIPS_OPERATION_BOOLEAN_OR, 
+		to_vector( a ) ) ); 
 }
 
 VImage 
 operator|( VImage a, double b ) 
 { 
-	return( a.boolean_const( to_vector( b ), 
-		VIPS_OPERATION_BOOLEAN_OR ) );
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_OR, 
+		to_vector( b ) ) );
 }
 
 VImage 
 operator|( std::vector<double> a, VImage b ) 
 {
-	return( b.boolean_const( a, VIPS_OPERATION_BOOLEAN_OR ) );
+	return( b.boolean_const( VIPS_OPERATION_BOOLEAN_OR, 
+		a ) );
 }
 
 VImage 
 operator|( VImage a, std::vector<double> b ) 
 { 
-	return( a.boolean_const( b, VIPS_OPERATION_BOOLEAN_OR ) );
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_OR, 
+		b ) );
+}
+
+VImage & 
+operator|=( VImage &a, const VImage b )
+{
+	return( a = a | b ); 
+}
+
+VImage & 
+operator|=( VImage &a, const double b )
+{
+	return( a = a | b ); 
+}
+
+VImage & 
+operator|=( VImage &a, std::vector<double> b )
+{
+	return( a = a | b ); 
 }
 
 VImage 
@@ -1145,27 +1294,47 @@ operator^( VImage a, VImage b )
 VImage 
 operator^( double a, VImage b ) 
 {
-	return( b.boolean_const( to_vector( a ), 
-		VIPS_OPERATION_BOOLEAN_EOR ) );
+	return( b.boolean_const( VIPS_OPERATION_BOOLEAN_EOR, 
+		to_vector( a ) ) ); 
 }
 
 VImage 
 operator^( VImage a, double b ) 
 { 
-	return( a.boolean_const( to_vector( b ), 
-		VIPS_OPERATION_BOOLEAN_EOR ) );
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_EOR, 
+		to_vector( b ) ) ); 
 }
 
 VImage 
 operator^( std::vector<double> a, VImage b ) 
 {
-	return( b.boolean_const( a, VIPS_OPERATION_BOOLEAN_EOR ) );
+	return( b.boolean_const( VIPS_OPERATION_BOOLEAN_EOR,
+		a ) );
 }
 
 VImage 
 operator^( VImage a, std::vector<double> b ) 
 { 
-	return( a.boolean_const( b, VIPS_OPERATION_BOOLEAN_EOR ) );
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_EOR,
+		b ) );
+}
+
+VImage & 
+operator^=( VImage &a, const VImage b )
+{
+	return( a = a ^ b ); 
+}
+
+VImage & 
+operator^=( VImage &a, const double b )
+{
+	return( a = a ^ b ); 
+}
+
+VImage & 
+operator^=( VImage &a, std::vector<double> b )
+{
+	return( a = a ^ b ); 
 }
 
 VImage 
@@ -1177,14 +1346,33 @@ operator<<( VImage a, VImage b )
 VImage 
 operator<<( VImage a, double b ) 
 { 
-	return( a.boolean_const( to_vector( b ), 
-		VIPS_OPERATION_BOOLEAN_LSHIFT ) ); 
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_LSHIFT, 
+		to_vector( b ) ) ); 
 }
 
 VImage 
 operator<<( VImage a, std::vector<double> b ) 
 { 
-	return( a.boolean_const( b, VIPS_OPERATION_BOOLEAN_LSHIFT ) ); 
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_LSHIFT, 
+		b ) ); 
+}
+
+VImage & 
+operator<<=( VImage &a, const VImage b )
+{
+	return( a = a << b ); 
+}
+
+VImage & 
+operator<<=( VImage &a, const double b )
+{
+	return( a = a << b ); 
+}
+
+VImage & 
+operator<<=( VImage &a, std::vector<double> b )
+{
+	return( a = a << b ); 
 }
 
 VImage 
@@ -1196,14 +1384,33 @@ operator>>( VImage a, VImage b )
 VImage 
 operator>>( VImage a, double b ) 
 { 
-	return( a.boolean_const( to_vector( b ), 
-		VIPS_OPERATION_BOOLEAN_RSHIFT ) ); 
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_RSHIFT, 
+		to_vector( b ) ) );  
 }
 
 VImage 
 operator>>( VImage a, std::vector<double> b ) 
 { 
-	return( a.boolean_const( b, VIPS_OPERATION_BOOLEAN_RSHIFT ) ); 
+	return( a.boolean_const( VIPS_OPERATION_BOOLEAN_RSHIFT,
+		b ) ); 
+}
+
+VImage & 
+operator>>=( VImage &a, const VImage b )
+{
+	return( a = a << b ); 
+}
+
+VImage & 
+operator>>=( VImage &a, const double b )
+{
+	return( a = a << b ); 
+}
+
+VImage & 
+operator>>=( VImage &a, std::vector<double> b )
+{
+	return( a = a << b ); 
 }
 
 VIPS_NAMESPACE_END

src/libvips/cplusplus/vips-operators.cpp

@@ -1,5 +1,5 @@
 // bodies for vips operations
-// Fri Feb 12 20:03:53 GMT 2016
+// Sun 26 Nov 17:44:23 GMT 2017
 // this file is generated automatically, do not edit!
 
 void VImage::system( char * cmd_format , VOption *options )
@@ -231,7 +231,7 @@ VImage VImage::round( VipsOperationRound round , VOption *options )
     return( out );
 }
 
-VImage VImage::relational_const( std::vector<double> c , VipsOperationRelational relational , VOption *options )
+VImage VImage::relational_const( VipsOperationRelational relational , std::vector<double> c , VOption *options )
 {
     VImage out;
 
@@ -239,8 +239,8 @@ VImage VImage::relational_const( std::vector<double> c , VipsOperationRelational
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "c", c ) ->
-            set( "relational", relational ) );
+            set( "relational", relational ) ->
+            set( "c", c ) );
 
     return( out );
 }
@@ -258,7 +258,7 @@ VImage VImage::remainder_const( std::vector<double> c , VOption *options )
     return( out );
 }
 
-VImage VImage::boolean_const( std::vector<double> c , VipsOperationBoolean boolean , VOption *options )
+VImage VImage::boolean_const( VipsOperationBoolean boolean , std::vector<double> c , VOption *options )
 {
     VImage out;
 
@@ -266,13 +266,13 @@ VImage VImage::boolean_const( std::vector<double> c , VipsOperationBoolean boole
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "c", c ) ->
-            set( "boolean", boolean ) );
+            set( "boolean", boolean ) ->
+            set( "c", c ) );
 
     return( out );
 }
 
-VImage VImage::math2_const( std::vector<double> c , VipsOperationMath2 math2 , VOption *options )
+VImage VImage::math2_const( VipsOperationMath2 math2 , std::vector<double> c , VOption *options )
 {
     VImage out;
 
@@ -280,8 +280,8 @@ VImage VImage::math2_const( std::vector<double> c , VipsOperationMath2 math2 , V
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "c", c ) ->
-            set( "math2", math2 ) );
+            set( "math2", math2 ) ->
+            set( "c", c ) );
 
     return( out );
 }
@@ -487,14 +487,29 @@ std::vector<double> VImage::getpoint( int x , int y , VOption *options )
     return( out_array );
 }
 
+int VImage::find_trim( int * top , int * width , int * height , VOption *options )
+{
+    int left;
+
+    call( "find_trim" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "left", &left ) ->
+            set( "top", top ) ->
+            set( "width", width ) ->
+            set( "height", height ) );
+
+    return( left );
+}
+
 VImage VImage::copy( VOption *options )
 {
     VImage out;
 
     call( "copy" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -505,8 +520,8 @@ VImage VImage::tilecache( VOption *options )
 
     call( "tilecache" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -517,8 +532,8 @@ VImage VImage::linecache( VOption *options )
 
     call( "linecache" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -529,8 +544,8 @@ VImage VImage::sequential( VOption *options )
 
     call( "sequential" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -541,8 +556,8 @@ VImage VImage::cache( VOption *options )
 
     call( "cache" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -563,14 +578,29 @@ VImage VImage::embed( int x , int y , int width , int height , VOption *options
     return( out );
 }
 
+VImage VImage::gravity( VipsCompassDirection direction , int width , int height , VOption *options )
+{
+    VImage out;
+
+    call( "gravity" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "out", &out ) ->
+            set( "direction", direction ) ->
+            set( "width", width ) ->
+            set( "height", height ) );
+
+    return( out );
+}
+
 VImage VImage::flip( VipsDirection direction , VOption *options )
 {
     VImage out;
 
     call( "flip" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
             set( "in", *this ) ->
+            set( "out", &out ) ->
             set( "direction", direction ) );
 
     return( out );
@@ -633,6 +663,20 @@ VImage VImage::extract_area( int left , int top , int width , int height , VOpti
     return( out );
 }
 
+VImage VImage::smartcrop( int width , int height , VOption *options )
+{
+    VImage out;
+
+    call( "smartcrop" ,
+        (options ? options : VImage::option()) ->
+            set( "input", *this ) ->
+            set( "out", &out ) ->
+            set( "width", width ) ->
+            set( "height", height ) );
+
+    return( out );
+}
+
 VImage VImage::extract_band( int band , VOption *options )
 {
     VImage out;
@@ -728,8 +772,8 @@ VImage VImage::cast( VipsBandFormat format , VOption *options )
 
     call( "cast" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
             set( "in", *this ) ->
+            set( "out", &out ) ->
             set( "format", format ) );
 
     return( out );
@@ -741,8 +785,8 @@ VImage VImage::rot( VipsAngle angle , VOption *options )
 
     call( "rot" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
             set( "in", *this ) ->
+            set( "out", &out ) ->
             set( "angle", angle ) );
 
     return( out );
@@ -754,8 +798,8 @@ VImage VImage::rot45( VOption *options )
 
     call( "rot45" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -766,8 +810,8 @@ VImage VImage::autorot( VOption *options )
 
     call( "autorot" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -805,8 +849,8 @@ VImage VImage::bandfold( VOption *options )
 
     call( "bandfold" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -817,8 +861,8 @@ VImage VImage::bandunfold( VOption *options )
 
     call( "bandunfold" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -829,8 +873,8 @@ VImage VImage::flatten( VOption *options )
 
     call( "flatten" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -841,8 +885,8 @@ VImage VImage::premultiply( VOption *options )
 
     call( "premultiply" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -853,8 +897,8 @@ VImage VImage::unpremultiply( VOption *options )
 
     call( "unpremultiply" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -865,8 +909,8 @@ VImage VImage::grid( int tile_height , int across , int down , VOption *options
 
     call( "grid" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
             set( "in", *this ) ->
+            set( "out", &out ) ->
             set( "tile-height", tile_height ) ->
             set( "across", across ) ->
             set( "down", down ) );
@@ -880,8 +924,8 @@ VImage VImage::scale( VOption *options )
 
     call( "scale" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -892,8 +936,8 @@ VImage VImage::wrap( VOption *options )
 
     call( "wrap" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -944,8 +988,8 @@ VImage VImage::byteswap( VOption *options )
 
     call( "byteswap" ,
         (options ? options : VImage::option()) ->
-            set( "out", &out ) ->
-            set( "in", *this ) );
+            set( "in", *this ) ->
+            set( "out", &out ) );
 
     return( out );
 }
@@ -974,6 +1018,19 @@ VImage VImage::gamma( VOption *options )
     return( out );
 }
 
+VImage VImage::composite( std::vector<VImage> in , std::vector<int> mode , VOption *options )
+{
+    VImage out;
+
+    call( "composite" ,
+        (options ? options : VImage::option()) ->
+            set( "in", in ) ->
+            set( "out", &out ) ->
+            set( "mode", mode ) );
+
+    return( out );
+}
+
 VImage VImage::black( int width , int height , VOption *options )
 {
     VImage out;
@@ -1321,26 +1378,28 @@ VImage VImage::fractsurf( int width , int height , double fractal_dimension , VO
     return( out );
 }
 
-VImage VImage::radload( char * filename , VOption *options )
+VImage VImage::worley( int width , int height , VOption *options )
 {
     VImage out;
 
-    call( "radload" ,
+    call( "worley" ,
         (options ? options : VImage::option()) ->
-            set( "filename", filename ) ->
-            set( "out", &out ) );
+            set( "out", &out ) ->
+            set( "width", width ) ->
+            set( "height", height ) );
 
     return( out );
 }
 
-VImage VImage::ppmload( char * filename , VOption *options )
+VImage VImage::perlin( int width , int height , VOption *options )
 {
     VImage out;
 
-    call( "ppmload" ,
+    call( "perlin" ,
         (options ? options : VImage::option()) ->
-            set( "filename", filename ) ->
-            set( "out", &out ) );
+            set( "out", &out ) ->
+            set( "width", width ) ->
+            set( "height", height ) );
 
     return( out );
 }
@@ -1369,18 +1428,6 @@ VImage VImage::matrixload( char * filename , VOption *options )
     return( out );
 }
 
-VImage VImage::analyzeload( char * filename , VOption *options )
-{
-    VImage out;
-
-    call( "analyzeload" ,
-        (options ? options : VImage::option()) ->
-            set( "filename", filename ) ->
-            set( "out", &out ) );
-
-    return( out );
-}
-
 VImage VImage::rawload( char * filename , int width , int height , int bands , VOption *options )
 {
     VImage out;
@@ -1408,6 +1455,42 @@ VImage VImage::vipsload( char * filename , VOption *options )
     return( out );
 }
 
+VImage VImage::analyzeload( char * filename , VOption *options )
+{
+    VImage out;
+
+    call( "analyzeload" ,
+        (options ? options : VImage::option()) ->
+            set( "filename", filename ) ->
+            set( "out", &out ) );
+
+    return( out );
+}
+
+VImage VImage::ppmload( char * filename , VOption *options )
+{
+    VImage out;
+
+    call( "ppmload" ,
+        (options ? options : VImage::option()) ->
+            set( "filename", filename ) ->
+            set( "out", &out ) );
+
+    return( out );
+}
+
+VImage VImage::radload( char * filename , VOption *options )
+{
+    VImage out;
+
+    call( "radload" ,
+        (options ? options : VImage::option()) ->
+            set( "filename", filename ) ->
+            set( "out", &out ) );
+
+    return( out );
+}
+
 VImage VImage::pdfload( char * filename , VOption *options )
 {
     VImage out;
@@ -1648,22 +1731,6 @@ VImage VImage::openexrload( char * filename , VOption *options )
     return( out );
 }
 
-void VImage::radsave( char * filename , VOption *options )
-{
-    call( "radsave" ,
-        (options ? options : VImage::option()) ->
-            set( "in", *this ) ->
-            set( "filename", filename ) );
-}
-
-void VImage::ppmsave( char * filename , VOption *options )
-{
-    call( "ppmsave" ,
-        (options ? options : VImage::option()) ->
-            set( "in", *this ) ->
-            set( "filename", filename ) );
-}
-
 void VImage::csvsave( char * filename , VOption *options )
 {
     call( "csvsave" ,
@@ -1711,6 +1778,34 @@ void VImage::vipssave( char * filename , VOption *options )
             set( "filename", filename ) );
 }
 
+void VImage::ppmsave( char * filename , VOption *options )
+{
+    call( "ppmsave" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "filename", filename ) );
+}
+
+void VImage::radsave( char * filename , VOption *options )
+{
+    call( "radsave" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "filename", filename ) );
+}
+
+VipsBlob * VImage::radsave_buffer( VOption *options )
+{
+    VipsBlob * buffer;
+
+    call( "radsave_buffer" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "buffer", &buffer ) );
+
+    return( buffer );
+}
+
 void VImage::dzsave( char * filename , VOption *options )
 {
     call( "dzsave" ,
@@ -1719,6 +1814,18 @@ void VImage::dzsave( char * filename , VOption *options )
             set( "filename", filename ) );
 }
 
+VipsBlob * VImage::dzsave_buffer( VOption *options )
+{
+    VipsBlob * buffer;
+
+    call( "dzsave_buffer" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "buffer", &buffer ) );
+
+    return( buffer );
+}
+
 void VImage::pngsave( char * filename , VOption *options )
 {
     call( "pngsave" ,
@@ -1794,6 +1901,18 @@ void VImage::tiffsave( char * filename , VOption *options )
             set( "filename", filename ) );
 }
 
+VipsBlob * VImage::tiffsave_buffer( VOption *options )
+{
+    VipsBlob * buffer;
+
+    call( "tiffsave_buffer" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "buffer", &buffer ) );
+
+    return( buffer );
+}
+
 void VImage::fitssave( char * filename , VOption *options )
 {
     call( "fitssave" ,
@@ -1802,6 +1921,45 @@ void VImage::fitssave( char * filename , VOption *options )
             set( "filename", filename ) );
 }
 
+VImage VImage::thumbnail( char * filename , int width , VOption *options )
+{
+    VImage out;
+
+    call( "thumbnail" ,
+        (options ? options : VImage::option()) ->
+            set( "filename", filename ) ->
+            set( "out", &out ) ->
+            set( "width", width ) );
+
+    return( out );
+}
+
+VImage VImage::thumbnail_buffer( VipsBlob * buffer , int width , VOption *options )
+{
+    VImage out;
+
+    call( "thumbnail_buffer" ,
+        (options ? options : VImage::option()) ->
+            set( "buffer", buffer ) ->
+            set( "out", &out ) ->
+            set( "width", width ) );
+
+    return( out );
+}
+
+VImage VImage::thumbnail_image( int width , VOption *options )
+{
+    VImage out;
+
+    call( "thumbnail_image" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "out", &out ) ->
+            set( "width", width ) );
+
+    return( out );
+}
+
 VImage VImage::mapim( VImage index , VOption *options )
 {
     VImage out;
@@ -1815,7 +1973,7 @@ VImage VImage::mapim( VImage index , VOption *options )
     return( out );
 }
 
-VImage VImage::shrink( double xshrink , double yshrink , VOption *options )
+VImage VImage::shrink( double hshrink , double vshrink , VOption *options )
 {
     VImage out;
 
@@ -1823,13 +1981,13 @@ VImage VImage::shrink( double xshrink , double yshrink , VOption *options )
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "xshrink", xshrink ) ->
-            set( "yshrink", yshrink ) );
+            set( "hshrink", hshrink ) ->
+            set( "vshrink", vshrink ) );
 
     return( out );
 }
 
-VImage VImage::shrinkh( int xshrink , VOption *options )
+VImage VImage::shrinkh( int hshrink , VOption *options )
 {
     VImage out;
 
@@ -1837,12 +1995,12 @@ VImage VImage::shrinkh( int xshrink , VOption *options )
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "xshrink", xshrink ) );
+            set( "hshrink", hshrink ) );
 
     return( out );
 }
 
-VImage VImage::shrinkv( int yshrink , VOption *options )
+VImage VImage::shrinkv( int vshrink , VOption *options )
 {
     VImage out;
 
@@ -1850,12 +2008,12 @@ VImage VImage::shrinkv( int yshrink , VOption *options )
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "yshrink", yshrink ) );
+            set( "vshrink", vshrink ) );
 
     return( out );
 }
 
-VImage VImage::reduceh( double xshrink , VOption *options )
+VImage VImage::reduceh( double hshrink , VOption *options )
 {
     VImage out;
 
@@ -1863,12 +2021,12 @@ VImage VImage::reduceh( double xshrink , VOption *options )
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "xshrink", xshrink ) );
+            set( "hshrink", hshrink ) );
 
     return( out );
 }
 
-VImage VImage::reducev( double yshrink , VOption *options )
+VImage VImage::reducev( double vshrink , VOption *options )
 {
     VImage out;
 
@@ -1876,12 +2034,12 @@ VImage VImage::reducev( double yshrink , VOption *options )
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "yshrink", yshrink ) );
+            set( "vshrink", vshrink ) );
 
     return( out );
 }
 
-VImage VImage::reduce( double xshrink , double yshrink , VOption *options )
+VImage VImage::reduce( double hshrink , double vshrink , VOption *options )
 {
     VImage out;
 
@@ -1889,8 +2047,8 @@ VImage VImage::reduce( double xshrink , double yshrink , VOption *options )
         (options ? options : VImage::option()) ->
             set( "in", *this ) ->
             set( "out", &out ) ->
-            set( "xshrink", xshrink ) ->
-            set( "yshrink", yshrink ) );
+            set( "hshrink", hshrink ) ->
+            set( "vshrink", vshrink ) );
 
     return( out );
 }
@@ -2475,6 +2633,45 @@ VImage VImage::conv( VImage mask , VOption *options )
     return( out );
 }
 
+VImage VImage::conva( VImage mask , VOption *options )
+{
+    VImage out;
+
+    call( "conva" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "out", &out ) ->
+            set( "mask", mask ) );
+
+    return( out );
+}
+
+VImage VImage::convf( VImage mask , VOption *options )
+{
+    VImage out;
+
+    call( "convf" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "out", &out ) ->
+            set( "mask", mask ) );
+
+    return( out );
+}
+
+VImage VImage::convi( VImage mask , VOption *options )
+{
+    VImage out;
+
+    call( "convi" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "out", &out ) ->
+            set( "mask", mask ) );
+
+    return( out );
+}
+
 VImage VImage::compass( VImage mask , VOption *options )
 {
     VImage out;
@@ -2501,6 +2698,19 @@ VImage VImage::convsep( VImage mask , VOption *options )
     return( out );
 }
 
+VImage VImage::convasep( VImage mask , VOption *options )
+{
+    VImage out;
+
+    call( "convasep" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "out", &out ) ->
+            set( "mask", mask ) );
+
+    return( out );
+}
+
 VImage VImage::fastcor( VImage ref , VOption *options )
 {
     VImage out;
@@ -2668,6 +2878,18 @@ VImage VImage::labelregions( VOption *options )
     return( mask );
 }
 
+VImage VImage::fill_nearest( VOption *options )
+{
+    VImage out;
+
+    call( "fill_nearest" ,
+        (options ? options : VImage::option()) ->
+            set( "in", *this ) ->
+            set( "out", &out ) );
+
+    return( out );
+}
+
 void VImage::draw_rect( std::vector<double> ink , int left , int top , int width , int height , VOption *options )
 {
     call( "draw_rect" ,

src/metadata.cc

@@ -1,25 +1,41 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #include <numeric>
+#include <vector>
 
 #include <node.h>
+#include <nan.h>
 #include <vips/vips8>
 
-#include "nan.h"
 #include "common.h"
 #include "metadata.h"
 
 class MetadataWorker : public Nan::AsyncWorker {
  public:
   MetadataWorker(
-    Nan::Callback *callback, MetadataBaton *baton,
-    std::vector<v8::Local<v8::Object>> const buffersToPersist
-  ) : Nan::AsyncWorker(callback), baton(baton), buffersToPersist(buffersToPersist) {
+    Nan::Callback *callback, MetadataBaton *baton, Nan::Callback *debuglog,
+    std::vector<v8::Local<v8::Object>> const buffersToPersist) :
+    Nan::AsyncWorker(callback, "sharp:MetadataWorker"),
+    baton(baton), debuglog(debuglog),
+    buffersToPersist(buffersToPersist) {
     // Protect Buffer objects from GC, keyed on index
     std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
       [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
         SaveToPersistent(index, buffer);
         return index + 1;
-      }
-    );
+      });
   }
   ~MetadataWorker() {}
 
@@ -42,6 +58,7 @@ class MetadataWorker : public Nan::AsyncWorker {
       baton->height = image.height();
       baton->space = vips_enum_nick(VIPS_TYPE_INTERPRETATION, image.interpretation());
       baton->channels = image.bands();
+      baton->depth = vips_enum_nick(VIPS_TYPE_BAND_FORMAT, image.format());
       if (sharp::HasDensity(image)) {
         baton->density = sharp::GetDensity(image);
       }
@@ -65,6 +82,22 @@ class MetadataWorker : public Nan::AsyncWorker {
         memcpy(baton->icc, icc, iccLength);
         baton->iccLength = iccLength;
       }
+      // IPTC
+      if (image.get_typeof(VIPS_META_IPTC_NAME) == VIPS_TYPE_BLOB) {
+        size_t iptcLength;
+        void const *iptc = image.get_blob(VIPS_META_IPTC_NAME, &iptcLength);
+        baton->iptc = static_cast<char *>(g_malloc(iptcLength));
+        memcpy(baton->iptc, iptc, iptcLength);
+        baton->iptcLength = iptcLength;
+      }
+      // XMP
+      if (image.get_typeof(VIPS_META_XMP_NAME) == VIPS_TYPE_BLOB) {
+        size_t xmpLength;
+        void const *xmp = image.get_blob(VIPS_META_XMP_NAME, &xmpLength);
+        baton->xmp = static_cast<char *>(g_malloc(xmpLength));
+        memcpy(baton->xmp, xmp, xmpLength);
+        baton->xmpLength = xmpLength;
+      }
     }
 
     // Clean up
@@ -72,7 +105,7 @@ class MetadataWorker : public Nan::AsyncWorker {
     vips_thread_shutdown();
   }
 
-  void HandleOKCallback () {
+  void HandleOKCallback() {
     using Nan::New;
     using Nan::Set;
     Nan::HandleScope();
@@ -88,6 +121,7 @@ class MetadataWorker : public Nan::AsyncWorker {
       Set(info, New("height").ToLocalChecked(), New<v8::Uint32>(baton->height));
       Set(info, New("space").ToLocalChecked(), New<v8::String>(baton->space).ToLocalChecked());
       Set(info, New("channels").ToLocalChecked(), New<v8::Uint32>(baton->channels));
+      Set(info, New("depth").ToLocalChecked(), New<v8::String>(baton->depth).ToLocalChecked());
       if (baton->density > 0) {
         Set(info, New("density").ToLocalChecked(), New<v8::Uint32>(baton->density));
       }
@@ -99,14 +133,22 @@ class MetadataWorker : public Nan::AsyncWorker {
       if (baton->exifLength > 0) {
         Set(info,
           New("exif").ToLocalChecked(),
-          Nan::NewBuffer(baton->exif, baton->exifLength, sharp::FreeCallback, nullptr).ToLocalChecked()
-        );
+          Nan::NewBuffer(baton->exif, baton->exifLength, sharp::FreeCallback, nullptr).ToLocalChecked());
       }
       if (baton->iccLength > 0) {
         Set(info,
           New("icc").ToLocalChecked(),
-          Nan::NewBuffer(baton->icc, baton->iccLength, sharp::FreeCallback, nullptr).ToLocalChecked()
-        );
+          Nan::NewBuffer(baton->icc, baton->iccLength, sharp::FreeCallback, nullptr).ToLocalChecked());
+      }
+      if (baton->iptcLength > 0) {
+        Set(info,
+          New("iptc").ToLocalChecked(),
+          Nan::NewBuffer(baton->iptc, baton->iptcLength, sharp::FreeCallback, nullptr).ToLocalChecked());
+      }
+      if (baton->xmpLength > 0) {
+        Set(info,
+          New("xmp").ToLocalChecked(),
+          Nan::NewBuffer(baton->xmp, baton->xmpLength, sharp::FreeCallback, nullptr).ToLocalChecked());
       }
       argv[1] = info;
     }
@@ -116,17 +158,25 @@ class MetadataWorker : public Nan::AsyncWorker {
       [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
         GetFromPersistent(index);
         return index + 1;
-      }
-    );
+      });
     delete baton->input;
     delete baton;
 
+    // Handle warnings
+    std::string warning = sharp::VipsWarningPop();
+    while (!warning.empty()) {
+      v8::Local<v8::Value> message[1] = { New(warning).ToLocalChecked() };
+      debuglog->Call(1, message, async_resource);
+      warning = sharp::VipsWarningPop();
+    }
+
     // Return to JavaScript
-    callback->Call(2, argv);
+    callback->Call(2, argv, async_resource);
   }
 
  private:
   MetadataBaton* baton;
+  Nan::Callback *debuglog;
   std::vector<v8::Local<v8::Object>> buffersToPersist;
 };
 
@@ -144,9 +194,12 @@ NAN_METHOD(metadata) {
   // Input
   baton->input = sharp::CreateInputDescriptor(sharp::AttrAs<v8::Object>(options, "input"), buffersToPersist);
 
+  // Function to notify of libvips warnings
+  Nan::Callback *debuglog = new Nan::Callback(sharp::AttrAs<v8::Function>(options, "debuglog"));
+
   // Join queue for worker thread
   Nan::Callback *callback = new Nan::Callback(info[1].As<v8::Function>());
-  Nan::AsyncQueueWorker(new MetadataWorker(callback, baton, buffersToPersist));
+  Nan::AsyncQueueWorker(new MetadataWorker(callback, baton, debuglog, buffersToPersist));
 
   // Increment queued task counter
   g_atomic_int_inc(&sharp::counterQueue);

src/metadata.h

@@ -1,8 +1,24 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #ifndef SRC_METADATA_H_
 #define SRC_METADATA_H_
 
-#include "nan.h"
-#include "common.h"
+#include <string>
+#include <nan.h>
+
+#include "./common.h"
 
 struct MetadataBaton {
   // Input
@@ -13,6 +29,7 @@ struct MetadataBaton {
   int height;
   std::string space;
   int channels;
+  std::string depth;
   int density;
   bool hasProfile;
   bool hasAlpha;
@@ -21,6 +38,10 @@ struct MetadataBaton {
   size_t exifLength;
   char *icc;
   size_t iccLength;
+  char *iptc;
+  size_t iptcLength;
+  char *xmp;
+  size_t xmpLength;
   std::string err;
 
   MetadataBaton():
@@ -35,7 +56,11 @@ struct MetadataBaton {
     exif(nullptr),
     exifLength(0),
     icc(nullptr),
-    iccLength(0) {}
+    iccLength(0),
+    iptc(nullptr),
+    iptcLength(0),
+    xmp(nullptr),
+    xmpLength(0) {}
 };
 
 NAN_METHOD(metadata);

src/operations.cc

@@ -1,7 +1,23 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #include <algorithm>
 #include <functional>
 #include <memory>
 #include <tuple>
+#include <vector>
+
 #include <vips/vips8>
 
 #include "common.h"
@@ -13,70 +29,32 @@ using vips::VError;
 namespace sharp {
 
   /*
-    Alpha composite src over dst with given gravity.
-    Assumes alpha channels are already premultiplied and will be unpremultiplied after.
+    Composite overlayImage over image at given position
+    Assumes alpha channels are already premultiplied and will be unpremultiplied after
    */
-  VImage Composite(VImage src, VImage dst, const int gravity) {
-    if(IsInputValidForComposition(src, dst)) {
-      // Enlarge overlay src, if required
-      if (src.width() < dst.width() || src.height() < dst.height()) {
-        // Calculate the (left, top) coordinates of the output image within the input image, applying the given gravity.
-        int left;
-        int top;
-        std::tie(left, top) = CalculateCrop(dst.width(), dst.height(), src.width(), src.height(), gravity);
-        // Embed onto transparent background
-        std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
-        src = src.embed(left, top, dst.width(), dst.height(), VImage::option()
+  VImage Composite(VImage image, VImage overlayImage, int const left, int const top) {
+    if (HasAlpha(overlayImage)) {
+      // Alpha composite
+      if (overlayImage.width() < image.width() || overlayImage.height() < image.height()) {
+        // Enlarge overlay
+        std::vector<double> const background { 0.0, 0.0, 0.0, 0.0 };
+        overlayImage = overlayImage.embed(left, top, image.width(), image.height(), VImage::option()
           ->set("extend", VIPS_EXTEND_BACKGROUND)
-          ->set("background", background)
-        );
+          ->set("background", background));
       }
-      return CompositeImage(src, dst);
-    }
-    // If the input was not valid for composition the return the input image itself
-    return dst;
-  }
-
-
-  VImage Composite(VImage src, VImage dst, const int x, const int y) {
-    if(IsInputValidForComposition(src, dst)) {
-      // Enlarge overlay src, if required
-      if (src.width() < dst.width() || src.height() < dst.height()) {
-        // Calculate the (left, top) coordinates of the output image within the input image, applying the given gravity.
-        int left;
-        int top;
-        std::tie(left, top) = CalculateCrop(dst.width(), dst.height(), src.width(), src.height(), x, y);
-        // Embed onto transparent background
-        std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
-        src = src.embed(left, top, dst.width(), dst.height(), VImage::option()
-          ->set("extend", VIPS_EXTEND_BACKGROUND)
-          ->set("background", background)
-        );
+      return AlphaComposite(image, overlayImage);
+    } else {
+      if (HasAlpha(image)) {
+        // Add alpha channel to overlayImage so channels match
+        double const multiplier = sharp::Is16Bit(overlayImage.interpretation()) ? 256.0 : 1.0;
+        overlayImage = overlayImage.bandjoin(
+          VImage::new_matrix(overlayImage.width(), overlayImage.height()).new_from_image(255 * multiplier));
       }
-      return CompositeImage(src, dst);
+      return image.insert(overlayImage, left, top);
     }
-    // If the input was not valid for composition the return the input image itself
-    return dst;
   }
 
-  bool IsInputValidForComposition(VImage src, VImage dst) {
-    using sharp::CalculateCrop;
-    using sharp::HasAlpha;
-
-    if (!HasAlpha(src)) {
-      throw VError("Overlay image must have an alpha channel");
-    }
-    if (!HasAlpha(dst)) {
-      throw VError("Image to be overlaid must have an alpha channel");
-    }
-    if (src.width() > dst.width() || src.height() > dst.height()) {
-      throw VError("Overlay image must have same dimensions or smaller");
-    }
-
-    return true;
-  }
-
-  VImage CompositeImage(VImage src, VImage dst) {
+  VImage AlphaComposite(VImage dst, VImage src) {
     // Split src into non-alpha and alpha channels
     VImage srcWithoutAlpha = src.extract_band(0, VImage::option()->set("n", src.bands() - 1));
     VImage srcAlpha = src[src.bands() - 1] * (1.0 / 255.0);
@@ -146,12 +124,11 @@ namespace sharp {
       std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
       mask = mask.embed(left, top, dst.width(), dst.height(), VImage::option()
               ->set("extend", VIPS_EXTEND_BACKGROUND)
-              ->set("background", background)
-      );
+              ->set("background", background));
     }
 
     // we use the mask alpha if it has alpha
-    if(maskHasAlpha) {
+    if (maskHasAlpha) {
       mask = mask.extract_band(mask.bands() - 1, VImage::option()->set("n", 1));;
     }
 
@@ -175,10 +152,37 @@ namespace sharp {
     return dst.bandjoin(mask.cast(dst.format()));
   }
 
+  /*
+   * Tint an image using the specified chroma, preserving the original image luminance
+   */
+  VImage Tint(VImage image, double const a, double const b) {
+    // Get original colourspace
+    VipsInterpretation typeBeforeTint = image.interpretation();
+    if (typeBeforeTint == VIPS_INTERPRETATION_RGB) {
+      typeBeforeTint = VIPS_INTERPRETATION_sRGB;
+    }
+    // Extract luminance
+    VImage luminance = image.colourspace(VIPS_INTERPRETATION_LAB)[0];
+    // Create the tinted version by combining the L from the original and the chroma from the tint
+    std::vector<double> chroma {a, b};
+    VImage tinted = luminance
+      .bandjoin(chroma)
+      .copy(VImage::option()->set("interpretation", VIPS_INTERPRETATION_LAB))
+      .colourspace(typeBeforeTint);
+    // 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
+      tinted = tinted.bandjoin(alpha);
+    }
+    return tinted;
+  }
+
   /*
    * Stretch luminance to cover full dynamic range.
    */
-  VImage Normalize(VImage image) {
+  VImage Normalise(VImage image) {
     // Get original colourspace
     VipsInterpretation typeBeforeNormalize = image.interpretation();
     if (typeBeforeNormalize == VIPS_INTERPRETATION_RGB) {
@@ -285,137 +289,13 @@ namespace sharp {
         colourspaceBeforeSharpen = VIPS_INTERPRETATION_sRGB;
       }
       return image.sharpen(
-        VImage::option()->set("sigma", sigma)->set("m1", flat)->set("m2", jagged)
-      ).colourspace(colourspaceBeforeSharpen);
+        VImage::option()->set("sigma", sigma)->set("m1", flat)->set("m2", jagged))
+        .colourspace(colourspaceBeforeSharpen);
     }
   }
 
-  /*
-    Calculate the Shannon entropy
-  */
-  double EntropyStrategy::operator()(VImage image) {
-    return image.hist_find().hist_entropy();
-  }
-
-  /*
-    Calculate the intensity of edges, skin tone and saturation
-  */
-  double AttentionStrategy::operator()(VImage image) {
-    // Convert to LAB colourspace
-    VImage lab = image.colourspace(VIPS_INTERPRETATION_LAB);
-    VImage l = lab[0];
-    VImage a = lab[1];
-    VImage b = lab[2];
-    // Edge detect luminosity with the Sobel operator
-    VImage sobel = vips::VImage::new_matrixv(3, 3,
-      -1.0, 0.0, 1.0,
-      -2.0, 0.0, 2.0,
-      -1.0, 0.0, 1.0);
-    VImage edges = l.conv(sobel).abs() + l.conv(sobel.rot90()).abs();
-    // Skin tone chroma thresholds trained with http://humanae.tumblr.com/
-    VImage skin = (a >= 3) & (a <= 22) & (b >= 4) & (b <= 31);
-    // Chroma >~50% saturation
-    VImage lch = lab.colourspace(VIPS_INTERPRETATION_LCH);
-    VImage c = lch[1];
-    VImage saturation = c > 60;
-    // Find maximum in combined saliency mask
-    VImage mask = edges + skin + saturation;
-    return mask.max();
-  }
-
-  /*
-    Calculate crop area based on image entropy
-  */
-  std::tuple<int, int> Crop(
-    VImage image, int const outWidth, int const outHeight, std::function<double(VImage)> strategy
-  ) {
-    int left = 0;
-    int top = 0;
-    int const inWidth = image.width();
-    int const inHeight = image.height();
-    if (inWidth > outWidth) {
-      // Reduce width by repeated removing slices from edge with lowest score
-      int width = inWidth;
-      double leftScore = 0.0;
-      double rightScore = 0.0;
-      // Max width of each slice
-      int const maxSliceWidth = static_cast<int>(ceil((inWidth - outWidth) / 8.0));
-      while (width > outWidth) {
-        // Width of current slice
-        int const slice = std::min(width - outWidth, maxSliceWidth);
-        if (leftScore == 0.0) {
-          // Update score of left slice
-          leftScore = strategy(image.extract_area(left, 0, slice, inHeight));
-        }
-        if (rightScore == 0.0) {
-          // Update score of right slice
-          rightScore = strategy(image.extract_area(width - slice - 1, 0, slice, inHeight));
-        }
-        // Keep slice with highest score
-        if (leftScore >= rightScore) {
-          // Discard right slice
-          rightScore = 0.0;
-        } else {
-          // Discard left slice
-          leftScore = 0.0;
-          left = left + slice;
-        }
-        width = width - slice;
-      }
-    }
-    if (inHeight > outHeight) {
-      // Reduce height by repeated removing slices from edge with lowest score
-      int height = inHeight;
-      double topScore = 0.0;
-      double bottomScore = 0.0;
-      // Max height of each slice
-      int const maxSliceHeight = static_cast<int>(ceil((inHeight - outHeight) / 8.0));
-      while (height > outHeight) {
-        // Height of current slice
-        int const slice = std::min(height - outHeight, maxSliceHeight);
-        if (topScore == 0.0) {
-          // Update score of top slice
-          topScore = strategy(image.extract_area(0, top, inWidth, slice));
-        }
-        if (bottomScore == 0.0) {
-          // Update score of bottom slice
-          bottomScore = strategy(image.extract_area(0, height - slice - 1, inWidth, slice));
-        }
-        // Keep slice with highest score
-        if (topScore >= bottomScore) {
-          // Discard bottom slice
-          bottomScore = 0.0;
-        } else {
-          // Discard top slice
-          topScore = 0.0;
-          top = top + slice;
-        }
-        height = height - slice;
-      }
-    }
-    return std::make_tuple(left, top);
-  }
-
-  /*
-    Insert a tile cache to prevent over-computation of any previous operations in the pipeline
-  */
-  VImage TileCache(VImage image, double const factor) {
-    int tile_width;
-    int tile_height;
-    int scanline_count;
-    vips_get_tile_size(image.get_image(), &tile_width, &tile_height, &scanline_count);
-    double const need_lines = 1.2 * scanline_count / factor;
-    return image.tilecache(VImage::option()
-      ->set("tile_width", image.width())
-      ->set("tile_height", 10)
-      ->set("max_tiles", static_cast<int>(round(1.0 + need_lines / 10.0)))
-      ->set("access", VIPS_ACCESS_SEQUENTIAL)
-      ->set("threaded", TRUE)
-    );
-  }
-
   VImage Threshold(VImage image, double const threshold, bool const thresholdGrayscale) {
-    if(!thresholdGrayscale) {
+    if (!thresholdGrayscale) {
       return image >= threshold;
     }
     return image.colourspace(VIPS_INTERPRETATION_B_W) >= threshold;
@@ -480,7 +360,7 @@ namespace sharp {
     int width = right - left;
     int height = bottom - top;
 
-    if(width <= 0 || height <= 0) {
+    if (width <= 0 || height <= 0) {
       throw VError("Unexpected error while trimming. Try to lower the tolerance");
     }
 
@@ -488,4 +368,18 @@ namespace sharp {
     return image.extract_area(left, top, width, height);
   }
 
+  /*
+   * Calculate (a * in + b)
+   */
+  VImage Linear(VImage image, double const a, double const b) {
+    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.linear(a, b).bandjoin(alpha);
+    } else {
+      return image.linear(a, b);
+    }
+  }
 }  // namespace sharp

src/operations.h

@@ -1,3 +1,17 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #ifndef SRC_OPERATIONS_H_
 #define SRC_OPERATIONS_H_
 
@@ -18,30 +32,29 @@ namespace sharp {
   VImage Composite(VImage src, VImage dst, const int gravity);
 
   /*
-    Alpha composite src over dst with given x and y offsets.
-    Assumes alpha channels are already premultiplied and will be unpremultiplied after.
+    Composite overlayImage over image at given position
    */
-  VImage Composite(VImage src, VImage dst, const int x, const int y);
+  VImage Composite(VImage image, VImage overlayImage, int const x, int const y);
 
   /*
-    Check if the src and dst Images for composition operation are valid
+    Alpha composite overlayImage over image, assumes matching dimensions
   */
-  bool IsInputValidForComposition(VImage src, VImage dst);
-
-  /*
-    Given a valid src and dst, returns the composite of the two images
-  */
-  VImage CompositeImage(VImage src, VImage dst);
+  VImage AlphaComposite(VImage image, VImage overlayImage);
 
   /*
     Cutout src over dst with given gravity.
   */
   VImage Cutout(VImage src, VImage dst, const int gravity);
 
+  /*
+   * Tint an image using the specified chroma, preserving the original image luminance
+   */
+  VImage Tint(VImage image, double const a, double const b);
+
   /*
    * Stretch luminance to cover full dynamic range.
    */
-  VImage Normalize(VImage image);
+  VImage Normalise(VImage image);
 
   /*
    * Gamma encoding/decoding
@@ -64,28 +77,6 @@ namespace sharp {
    */
   VImage Sharpen(VImage image, double const sigma, double const flat, double const jagged);
 
-  /*
-    Crop strategy functors
-  */
-  struct EntropyStrategy {
-    double operator()(VImage image);
-  };
-  struct AttentionStrategy {
-    double operator()(VImage image);
-  };
-
-  /*
-    Calculate crop area based on given strategy (Entropy, Attention)
-  */
-  std::tuple<int, int> Crop(
-    VImage image, int const outWidth, int const outHeight, std::function<double(VImage)> strategy
-  );
-
-  /*
-    Insert a tile cache to prevent over-computation of any previous operations in the pipeline
-  */
-  VImage TileCache(VImage image, double const factor);
-
   /*
     Threshold an image
   */
@@ -106,6 +97,11 @@ namespace sharp {
   */
   VImage Trim(VImage image, int const tolerance);
 
+  /*
+   * Linear adjustment (a * in + b)
+   */
+  VImage Linear(VImage image, double const a, double const b);
+
 }  // namespace sharp
 
 #endif  // SRC_OPERATIONS_H_

src/pipeline.h

@@ -1,12 +1,28 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #ifndef SRC_PIPELINE_H_
 #define SRC_PIPELINE_H_
 
 #include <memory>
+#include <string>
+#include <vector>
 
+#include <nan.h>
 #include <vips/vips8>
 
-#include "nan.h"
-#include "common.h"
+#include "./common.h"
 
 NAN_METHOD(pipeline);
 
@@ -46,23 +62,32 @@ struct PipelineBaton {
   int channels;
   Canvas canvas;
   int crop;
-  int cropCalcLeft;
-  int cropCalcTop;
+  int embed;
+  bool hasCropOffset;
+  int cropOffsetLeft;
+  int cropOffsetTop;
+  bool premultiplied;
   std::string kernel;
-  std::string interpolator;
+  bool fastShrinkOnLoad;
   double background[4];
+  double tintA;
+  double tintB;
   bool flatten;
   bool negate;
   double blurSigma;
+  int medianSize;
   double sharpenSigma;
   double sharpenFlat;
   double sharpenJagged;
   int threshold;
   bool thresholdGrayscale;
   int trimTolerance;
+  double linearA;
+  double linearB;
   double gamma;
   bool greyscale;
-  bool normalize;
+  bool normalise;
+  bool useExifOrientation;
   int angle;
   bool rotateBeforePreExtract;
   bool flip;
@@ -71,16 +96,27 @@ struct PipelineBaton {
   int extendBottom;
   int extendLeft;
   int extendRight;
-  bool progressive;
   bool withoutEnlargement;
   VipsAccess accessMethod;
-  int quality;
-  int compressionLevel;
-  bool withoutAdaptiveFiltering;
-  bool withoutChromaSubsampling;
-  bool trellisQuantisation;
-  bool overshootDeringing;
-  bool optimiseScans;
+  int jpegQuality;
+  bool jpegProgressive;
+  std::string jpegChromaSubsampling;
+  bool jpegTrellisQuantisation;
+  bool jpegOvershootDeringing;
+  bool jpegOptimiseScans;
+  bool pngProgressive;
+  int pngCompressionLevel;
+  bool pngAdaptiveFiltering;
+  int webpQuality;
+  int webpAlphaQuality;
+  bool webpNearLossless;
+  bool webpLossless;
+  int tiffQuality;
+  VipsForeignTiffCompression tiffCompression;
+  VipsForeignTiffPredictor tiffPredictor;
+  bool tiffSquash;
+  double tiffXres;
+  double tiffYres;
   std::string err;
   bool withMetadata;
   int withMetadataOrientation;
@@ -98,6 +134,8 @@ struct PipelineBaton {
   int tileOverlap;
   VipsForeignDzContainer tileContainer;
   VipsForeignDzLayout tileLayout;
+  std::string tileFormat;
+  int tileAngle;
 
   PipelineBaton():
     input(nullptr),
@@ -114,20 +152,29 @@ struct PipelineBaton {
     channels(0),
     canvas(Canvas::CROP),
     crop(0),
-    cropCalcLeft(-1),
-    cropCalcTop(-1),
+    embed(0),
+    hasCropOffset(false),
+    cropOffsetLeft(0),
+    cropOffsetTop(0),
+    premultiplied(false),
+    tintA(128.0),
+    tintB(128.0),
     flatten(false),
     negate(false),
     blurSigma(0.0),
+    medianSize(0),
     sharpenSigma(0.0),
     sharpenFlat(1.0),
     sharpenJagged(2.0),
     threshold(0),
     thresholdGrayscale(true),
     trimTolerance(0),
+    linearA(1.0),
+    linearB(0.0),
     gamma(0.0),
     greyscale(false),
-    normalize(false),
+    normalise(false),
+    useExifOrientation(false),
     angle(0),
     flip(false),
     flop(false),
@@ -135,15 +182,23 @@ struct PipelineBaton {
     extendBottom(0),
     extendLeft(0),
     extendRight(0),
-    progressive(false),
     withoutEnlargement(false),
-    quality(80),
-    compressionLevel(6),
-    withoutAdaptiveFiltering(false),
-    withoutChromaSubsampling(false),
-    trellisQuantisation(false),
-    overshootDeringing(false),
-    optimiseScans(false),
+    jpegQuality(80),
+    jpegProgressive(false),
+    jpegChromaSubsampling("4:2:0"),
+    jpegTrellisQuantisation(false),
+    jpegOvershootDeringing(false),
+    jpegOptimiseScans(false),
+    pngProgressive(false),
+    pngCompressionLevel(9),
+    pngAdaptiveFiltering(false),
+    webpQuality(80),
+    tiffQuality(80),
+    tiffCompression(VIPS_FOREIGN_TIFF_COMPRESSION_JPEG),
+    tiffPredictor(VIPS_FOREIGN_TIFF_PREDICTOR_HORIZONTAL),
+    tiffSquash(false),
+    tiffXres(1.0),
+    tiffYres(1.0),
     withMetadata(false),
     withMetadataOrientation(-1),
     convKernelWidth(0),
@@ -158,7 +213,8 @@ struct PipelineBaton {
     tileSize(256),
     tileOverlap(0),
     tileContainer(VIPS_FOREIGN_DZ_CONTAINER_FS),
-    tileLayout(VIPS_FOREIGN_DZ_LAYOUT_DZ) {
+    tileLayout(VIPS_FOREIGN_DZ_LAYOUT_DZ),
+    tileAngle(0){
       background[0] = 0.0;
       background[1] = 0.0;
       background[2] = 0.0;

src/sharp.cc

@@ -1,16 +1,33 @@
-#include <node.h>
-#include <vips/vips8>
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
 
-#include "nan.h"
+#include <node.h>
+#include <nan.h>
+#include <vips/vips8>
 
 #include "common.h"
 #include "metadata.h"
 #include "pipeline.h"
 #include "utilities.h"
+#include "stats.h"
 
 NAN_MODULE_INIT(init) {
   vips_init("sharp");
 
+  g_log_set_handler("VIPS", static_cast<GLogLevelFlags>(G_LOG_LEVEL_WARNING),
+    static_cast<GLogFunc>(sharp::VipsWarningCallback), nullptr);
+
   // Methods available to JavaScript
   Nan::Set(target, Nan::New("metadata").ToLocalChecked(),
     Nan::GetFunction(Nan::New<v8::FunctionTemplate>(metadata)).ToLocalChecked());
@@ -30,6 +47,8 @@ NAN_MODULE_INIT(init) {
     Nan::GetFunction(Nan::New<v8::FunctionTemplate>(format)).ToLocalChecked());
   Nan::Set(target, Nan::New("_maxColourDistance").ToLocalChecked(),
     Nan::GetFunction(Nan::New<v8::FunctionTemplate>(_maxColourDistance)).ToLocalChecked());
+  Nan::Set(target, Nan::New("stats").ToLocalChecked(),
+    Nan::GetFunction(Nan::New<v8::FunctionTemplate>(stats)).ToLocalChecked());
 }
 
 NODE_MODULE(sharp, init)

src/stats.cc

@@ -0,0 +1,189 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
+#include <numeric>
+#include <vector>
+#include <iostream>
+
+#include <node.h>
+#include <nan.h>
+#include <vips/vips8>
+
+#include "common.h"
+#include "stats.h"
+
+class StatsWorker : public Nan::AsyncWorker {
+ public:
+  StatsWorker(
+    Nan::Callback *callback, StatsBaton *baton, Nan::Callback *debuglog,
+    std::vector<v8::Local<v8::Object>> const buffersToPersist) :
+    Nan::AsyncWorker(callback, "sharp:StatsWorker"),
+    baton(baton), debuglog(debuglog),
+    buffersToPersist(buffersToPersist) {
+    // Protect Buffer objects from GC, keyed on index
+    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
+      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
+        SaveToPersistent(index, buffer);
+        return index + 1;
+      });
+  }
+  ~StatsWorker() {}
+
+  const int STAT_MIN_INDEX = 0;
+  const int STAT_MAX_INDEX = 1;
+  const int STAT_SUM_INDEX = 2;
+  const int STAT_SQ_SUM_INDEX = 3;
+  const int STAT_MEAN_INDEX = 4;
+  const int STAT_STDEV_INDEX = 5;
+  const int STAT_MINX_INDEX = 6;
+  const int STAT_MINY_INDEX = 7;
+  const int STAT_MAXX_INDEX = 8;
+  const int STAT_MAXY_INDEX = 9;
+
+  void Execute() {
+    // Decrement queued task counter
+    g_atomic_int_dec_and_test(&sharp::counterQueue);
+    using Nan::New;
+    using Nan::Set;
+    using sharp::MaximumImageAlpha;
+
+    vips::VImage image;
+    vips::VImage stats;
+    sharp::ImageType imageType = sharp::ImageType::UNKNOWN;
+
+    try {
+      std::tie(image, imageType) = OpenInput(baton->input, baton->accessMethod);
+    } catch (vips::VError const &err) {
+      (baton->err).append(err.what());
+    }
+    if (imageType != sharp::ImageType::UNKNOWN) {
+      try {
+        stats = image.stats();
+        int bands = image.bands();
+        double const max = MaximumImageAlpha(image.interpretation());
+        for (int b = 1; b <= bands; b++) {
+          ChannelStats cStats(static_cast<int>(stats.getpoint(STAT_MIN_INDEX, b).front()),
+                              static_cast<int>(stats.getpoint(STAT_MAX_INDEX, b).front()),
+                              stats.getpoint(STAT_SUM_INDEX, b).front(), stats.getpoint(STAT_SQ_SUM_INDEX, b).front(),
+                              stats.getpoint(STAT_MEAN_INDEX, b).front(), stats.getpoint(STAT_STDEV_INDEX, b).front(),
+                              static_cast<int>(stats.getpoint(STAT_MINX_INDEX, b).front()),
+                              static_cast<int>(stats.getpoint(STAT_MINY_INDEX, b).front()),
+                              static_cast<int>(stats.getpoint(STAT_MAXX_INDEX, b).front()),
+                              static_cast<int>(stats.getpoint(STAT_MAXY_INDEX, b).front()));
+          baton->channelStats.push_back(cStats);
+        }
+
+        // alpha layer is there and the last band i.e. alpha has its max value greater than 0)
+        if (sharp::HasAlpha(image) && stats.getpoint(STAT_MIN_INDEX, bands).front() != max) {
+          baton->isOpaque = false;
+        }
+      } catch (vips::VError const &err) {
+        (baton->err).append(err.what());
+      }
+    }
+
+    // Clean up
+    vips_error_clear();
+    vips_thread_shutdown();
+  }
+
+  void HandleOKCallback() {
+    using Nan::New;
+    using Nan::Set;
+    Nan::HandleScope();
+
+    v8::Local<v8::Value> argv[2] = { Nan::Null(), Nan::Null() };
+    if (!baton->err.empty()) {
+      argv[0] = Nan::Error(baton->err.data());
+    } else {
+      // Stats Object
+      v8::Local<v8::Object> info = New<v8::Object>();
+      v8::Local<v8::Array> channels = New<v8::Array>();
+
+      std::vector<ChannelStats>::iterator it;
+      int i = 0;
+      for (it=baton->channelStats.begin() ; it < baton->channelStats.end(); it++, i++) {
+        v8::Local<v8::Object> channelStat = New<v8::Object>();
+        Set(channelStat, New("min").ToLocalChecked(), New<v8::Number>(it->min));
+        Set(channelStat, New("max").ToLocalChecked(), New<v8::Number>(it->max));
+        Set(channelStat, New("sum").ToLocalChecked(), New<v8::Number>(it->sum));
+        Set(channelStat, New("squaresSum").ToLocalChecked(), New<v8::Number>(it->squaresSum));
+        Set(channelStat, New("mean").ToLocalChecked(), New<v8::Number>(it->mean));
+        Set(channelStat, New("stdev").ToLocalChecked(), New<v8::Number>(it->stdev));
+        Set(channelStat, New("minX").ToLocalChecked(), New<v8::Number>(it->minX));
+        Set(channelStat, New("minY").ToLocalChecked(), New<v8::Number>(it->minY));
+        Set(channelStat, New("maxX").ToLocalChecked(), New<v8::Number>(it->maxX));
+        Set(channelStat, New("maxY").ToLocalChecked(), New<v8::Number>(it->maxY));
+        channels->Set(i, channelStat);
+      }
+
+      Set(info, New("channels").ToLocalChecked(), channels);
+      Set(info, New("isOpaque").ToLocalChecked(), New<v8::Boolean>(baton->isOpaque));
+      argv[1] = info;
+    }
+
+    // Dispose of Persistent wrapper around input Buffers so they can be garbage collected
+    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
+      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
+        GetFromPersistent(index);
+        return index + 1;
+      });
+    delete baton->input;
+    delete baton;
+
+    // Handle warnings
+    std::string warning = sharp::VipsWarningPop();
+    while (!warning.empty()) {
+      v8::Local<v8::Value> message[1] = { New(warning).ToLocalChecked() };
+      debuglog->Call(1, message, async_resource);
+      warning = sharp::VipsWarningPop();
+    }
+
+    // Return to JavaScript
+    callback->Call(2, argv, async_resource);
+  }
+
+ private:
+  StatsBaton* baton;
+  Nan::Callback *debuglog;
+  std::vector<v8::Local<v8::Object>> buffersToPersist;
+};
+
+/*
+  stats(options, callback)
+*/
+NAN_METHOD(stats) {
+  using sharp::AttrTo;
+
+  // Input Buffers must not undergo GC compaction during processing
+  std::vector<v8::Local<v8::Object>> buffersToPersist;
+
+  // V8 objects are converted to non-V8 types held in the baton struct
+  StatsBaton *baton = new StatsBaton;
+  v8::Local<v8::Object> options = info[0].As<v8::Object>();
+
+  // Input
+  baton->input = sharp::CreateInputDescriptor(sharp::AttrAs<v8::Object>(options, "input"), buffersToPersist);
+  baton->accessMethod = AttrTo<bool>(options, "sequentialRead") ? VIPS_ACCESS_SEQUENTIAL : VIPS_ACCESS_RANDOM;
+
+  // Function to notify of libvips warnings
+  Nan::Callback *debuglog = new Nan::Callback(sharp::AttrAs<v8::Function>(options, "debuglog"));
+
+  // Join queue for worker thread
+  Nan::Callback *callback = new Nan::Callback(info[1].As<v8::Function>());
+  Nan::AsyncQueueWorker(new StatsWorker(callback, baton, debuglog, buffersToPersist));
+
+  // Increment queued task counter
+  g_atomic_int_inc(&sharp::counterQueue);
+}

src/stats.h

@@ -0,0 +1,65 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
+#ifndef SRC_STATS_H_
+#define SRC_STATS_H_
+
+#include <string>
+#include <nan.h>
+
+#include "./common.h"
+
+struct ChannelStats {
+  // stats per channel
+  int min;
+  int max;
+  double sum;
+  double squaresSum;
+  double mean;
+  double stdev;
+  int minX;
+  int minY;
+  int maxX;
+  int maxY;
+
+  ChannelStats():
+    min(0), max(0), sum(0), squaresSum(0), mean(0), stdev(0)
+    , minX(0), minY(0), maxX(0), maxY(0) {}
+
+    ChannelStats(int minVal, int maxVal, double sumVal, double squaresSumVal,
+                  double meanVal, double stdevVal, int minXVal, int minYVal, int maxXVal, int maxYVal):
+    min(minVal), max(maxVal), sum(sumVal), squaresSum(squaresSumVal),
+    mean(meanVal), stdev(stdevVal), minX(minXVal), minY(minYVal), maxX(maxXVal), maxY(maxYVal) {}
+};
+
+struct StatsBaton {
+  // Input
+  sharp::InputDescriptor *input;
+  VipsAccess accessMethod;
+
+  // Output
+  std::vector<ChannelStats> channelStats;
+  bool isOpaque;
+
+  std::string err;
+
+  StatsBaton():
+    input(nullptr),
+    isOpaque(true)
+    {}
+};
+
+NAN_METHOD(stats);
+
+#endif  // SRC_STATS_H_

src/utilities.cc

@@ -1,10 +1,25 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #include <cmath>
+#include <string>
+
 #include <node.h>
+#include <nan.h>
 #include <vips/vips8>
 #include <vips/vector.h>
 
-#include "nan.h"
-
 #include "common.h"
 #include "operations.h"
 #include "utilities.h"
@@ -45,14 +60,11 @@ NAN_METHOD(cache) {
   // Get memory stats
   Local<Object> memory = New<Object>();
   Set(memory, New("current").ToLocalChecked(),
-    New<Integer>(static_cast<int>(round(vips_tracked_get_mem() / 1048576)))
-  );
+    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)))
-  );
+    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)))
-  );
+    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()));

src/utilities.h

@@ -1,7 +1,21 @@
+// Copyright 2013, 2014, 2015, 2016, 2017 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
+//
+// 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.
+
 #ifndef SRC_UTILITIES_H_
 #define SRC_UTILITIES_H_
 
-#include "nan.h"
+#include <nan.h>
 
 NAN_METHOD(cache);
 NAN_METHOD(concurrency);

test/bench/package.json

@@ -5,20 +5,22 @@
   "author": "Lovell Fuller <npm@lovell.info>",
   "description": "Benchmark and performance tests for sharp",
   "scripts": {
-    "test": "VIPS_WARNING=0 node perf && node random && node parallel"
+    "test": "node perf && node random && node parallel"
   },
   "devDependencies": {
-    "async": "^2.1.1",
-    "benchmark": "^2.1.1",
-    "gm": "^1.23.0",
+    "async": "^2.6.0",
+    "benchmark": "^2.1.4",
+    "gm": "^1.23.1",
     "imagemagick": "^0.1.3",
     "imagemagick-native": "^1.9.3",
-    "jimp": "^0.2.27",
-    "lwip": "^0.0.9",
-    "semver": "^5.3.0"
+    "images": "^3.0.1",
+    "jimp": "^0.2.28",
+    "mapnik": "^3.6.2",
+    "pajk-lwip": "^0.2.0",
+    "semver": "^5.4.1"
   },
   "license": "Apache-2.0",
   "engines": {
-    "node": ">=0.10"
+    "node": ">=4"
   }
 }

test/bench/parallel.js

@@ -2,43 +2,44 @@
 
 process.env.UV_THREADPOOL_SIZE = 64;
 
-var assert = require('assert');
-var async = require('async');
+const assert = require('assert');
+const async = require('async');
 
-var sharp = require('../../index');
-var fixtures = require('../fixtures');
+const sharp = require('../../');
+const fixtures = require('../fixtures');
 
-var width = 720;
-var height = 480;
+const width = 720;
+const height = 480;
 
 sharp.concurrency(1);
 sharp.simd(true);
 
-var timer = setInterval(function() {
+const 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.mapSeries([1, 1, 2, 4, 8, 16, 32, 64], function (parallelism, next) {
+  const start = new Date().getTime();
   async.times(parallelism,
-    function(id, callback) {
-      /*jslint unused: false */
-      sharp(fixtures.inputJpg).resize(width, height).toBuffer(function(err, buffer) {
+    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) {
+    function (err, ids) {
       assert(!err);
       assert(ids.length === parallelism);
-      var mean = ids.reduce(function(a, b) {
+      ids.sort();
+      const 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() {
+}, function () {
   clearInterval(timer);
   console.dir(sharp.counters());
 });

test/bench/perf.js

@@ -1,34 +1,40 @@
 'use strict';
 
-var fs = require('fs');
+const fs = require('fs');
 
-var async = require('async');
-var assert = require('assert');
-var Benchmark = require('benchmark');
-var semver = require('semver');
+const async = require('async');
+const assert = require('assert');
+const Benchmark = require('benchmark');
 
 // Contenders
-var gm = require('gm');
-var imagemagick = require('imagemagick');
-var jimp = require('jimp');
-var sharp = require('../../');
-var imagemagickNative;
+const sharp = require('../../');
+const gm = require('gm');
+const imagemagick = require('imagemagick');
+const mapnik = require('mapnik');
+const jimp = require('jimp');
+let images;
+try {
+  images = require('images');
+} catch (err) {
+  console.log('Excluding node-images');
+}
+let imagemagickNative;
 try {
   imagemagickNative = require('imagemagick-native');
 } catch (err) {
   console.log('Excluding imagemagick-native');
 }
-var lwip;
+let lwip;
 try {
-  lwip = require('lwip');
+  lwip = require('pajk-lwip');
 } catch (err) {
   console.log('Excluding lwip');
 }
 
-var fixtures = require('../fixtures');
+const fixtures = require('../fixtures');
 
-var width = 720;
-var height = 480;
+const width = 720;
+const height = 588;
 
 // Disable libvips cache to ensure tests are as fair as they can be
 sharp.cache(false);
@@ -36,18 +42,18 @@ sharp.cache(false);
 sharp.simd(true);
 
 async.series({
-  'jpeg': function(callback) {
-    var inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
-    var jpegSuite = new Benchmark.Suite('jpeg');
+  'jpeg': function (callback) {
+    const inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
+    const jpegSuite = new Benchmark.Suite('jpeg');
     // jimp
     jpegSuite.add('jimp-buffer-buffer', {
       defer: true,
-      fn: function(deferred) {
-        new jimp(inputJpgBuffer, function(err) {
+      fn: function (deferred) {
+        jimp.read(inputJpgBuffer, function (err, image) {
           if (err) {
             throw err;
           } else {
-            this
+            image
               .resize(width, height)
               .quality(80)
               .getBuffer(jimp.MIME_JPEG, function (err) {
@@ -62,12 +68,12 @@ async.series({
       }
     }).add('jimp-file-file', {
       defer: true,
-      fn: function(deferred) {
-        new jimp(fixtures.inputJpg, function(err) {
+      fn: function (deferred) {
+        jimp.read(fixtures.inputJpg, function (err, image) {
           if (err) {
             throw err;
           } else {
-            this
+            image
               .resize(width, height)
               .quality(80)
               .write(fixtures.outputJpg, function (err) {
@@ -85,7 +91,7 @@ async.series({
     if (typeof lwip !== 'undefined') {
       jpegSuite.add('lwip-file-file', {
         defer: true,
-        fn: function(deferred) {
+        fn: function (deferred) {
           lwip.open(fixtures.inputJpg, function (err, image) {
             if (err) {
               throw err;
@@ -105,7 +111,7 @@ async.series({
         }
       }).add('lwip-buffer-buffer', {
         defer: true,
-        fn: function(deferred) {
+        fn: function (deferred) {
           lwip.open(inputJpgBuffer, 'jpg', function (err, image) {
             if (err) {
               throw err;
@@ -126,10 +132,42 @@ async.series({
         }
       });
     }
+    // mapnik
+    jpegSuite.add('mapnik-file-file', {
+      defer: true,
+      fn: function (deferred) {
+        mapnik.Image.open(fixtures.inputJpg, function (err, img) {
+          if (err) throw err;
+          img
+            .resize(width, height, {
+              scaling_method: mapnik.imageScaling.lanczos
+            })
+            .save(fixtures.outputJpg, 'jpeg:quality=80', function (err) {
+              if (err) throw err;
+              deferred.resolve();
+            });
+        });
+      }
+    }).add('mapnik-buffer-buffer', {
+      defer: true,
+      fn: function (deferred) {
+        mapnik.Image.fromBytes(inputJpgBuffer, { max_size: 3000 }, function (err, img) {
+          if (err) throw err;
+          img
+            .resize(width, height, {
+              scaling_method: mapnik.imageScaling.lanczos
+            })
+            .encode('jpeg:quality=80', function (err) {
+              if (err) throw err;
+              deferred.resolve();
+            });
+        });
+      }
+    });
     // imagemagick
     jpegSuite.add('imagemagick-file-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         imagemagick.resize({
           srcPath: fixtures.inputJpg,
           dstPath: fixtures.outputJpg,
@@ -138,7 +176,7 @@ async.series({
           height: height,
           format: 'jpg',
           filter: 'Lanczos'
-        }, function(err) {
+        }, function (err) {
           if (err) {
             throw err;
           } else {
@@ -151,7 +189,7 @@ async.series({
     if (typeof imagemagickNative !== 'undefined') {
       jpegSuite.add('imagemagick-native-buffer-buffer', {
         defer: true,
-        fn: function(deferred) {
+        fn: function (deferred) {
           imagemagickNative.convert({
             srcData: inputJpgBuffer,
             quality: 80,
@@ -173,10 +211,10 @@ async.series({
     // gm
     jpegSuite.add('gm-buffer-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         gm(inputJpgBuffer)
-          .resize(width, height)
           .filter('Lanczos')
+          .resize(width, height)
           .quality(80)
           .write(fixtures.outputJpg, function (err) {
             if (err) {
@@ -188,10 +226,10 @@ async.series({
       }
     }).add('gm-buffer-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         gm(inputJpgBuffer)
-          .resize(width, height)
           .filter('Lanczos')
+          .resize(width, height)
           .quality(80)
           .toBuffer(function (err, buffer) {
             if (err) {
@@ -204,10 +242,10 @@ async.series({
       }
     }).add('gm-file-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         gm(fixtures.inputJpg)
-          .resize(width, height)
           .filter('Lanczos')
+          .resize(width, height)
           .quality(80)
           .write(fixtures.outputJpg, function (err) {
             if (err) {
@@ -219,10 +257,10 @@ async.series({
       }
     }).add('gm-file-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         gm(fixtures.inputJpg)
-          .resize(width, height)
           .filter('Lanczos')
+          .resize(width, height)
           .quality(80)
           .toBuffer(function (err, buffer) {
             if (err) {
@@ -234,13 +272,21 @@ async.series({
           });
       }
     });
+    // images
+    if (typeof images !== 'undefined') {
+      jpegSuite.add('images-file-file', function () {
+        images(fixtures.inputJpg)
+          .resize(width, height)
+          .save(fixtures.outputJpg, { quality: 80 });
+      });
+    }
     // sharp
     jpegSuite.add('sharp-buffer-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputJpg, function(err) {
+          .toFile(fixtures.outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -250,10 +296,10 @@ async.series({
       }
     }).add('sharp-buffer-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -264,10 +310,10 @@ async.series({
       }
     }).add('sharp-file-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(fixtures.inputJpg)
           .resize(width, height)
-          .toFile(fixtures.outputJpg, function(err) {
+          .toFile(fixtures.outputJpg, function (err) {
             if (err) {
               throw err;
             } else {
@@ -277,22 +323,22 @@ async.series({
       }
     }).add('sharp-stream-stream', {
       defer: true,
-      fn: function(deferred) {
-        var readable = fs.createReadStream(fixtures.inputJpg);
-        var writable = fs.createWriteStream(fixtures.outputJpg);
-        writable.on('finish', function() {
+      fn: function (deferred) {
+        const readable = fs.createReadStream(fixtures.inputJpg);
+        const writable = fs.createWriteStream(fixtures.outputJpg);
+        writable.on('finish', function () {
           deferred.resolve();
         });
-        var pipeline = sharp()
+        const pipeline = sharp()
           .resize(width, height);
         readable.pipe(pipeline).pipe(writable);
       }
     }).add('sharp-file-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(fixtures.inputJpg)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -303,32 +349,32 @@ async.series({
       }
     }).add('sharp-promise', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .toBuffer()
-          .then(function(buffer) {
+          .then(function (buffer) {
             assert.notStrictEqual(null, buffer);
             deferred.resolve();
           });
       }
-    }).on('cycle', function(event) {
+    }).on('cycle', function (event) {
       console.log('jpeg ' + String(event.target));
-    }).on('complete', function() {
+    }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
   },
   // Effect of applying operations
-  operations: function(callback) {
-    var inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
-    var operationsSuite = new Benchmark.Suite('operations');
+  operations: function (callback) {
+    const inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
+    const operationsSuite = new Benchmark.Suite('operations');
     operationsSuite.add('sharp-sharpen-mild', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .sharpen()
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -339,11 +385,11 @@ async.series({
       }
     }).add('sharp-sharpen-radius', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .sharpen(3, 1, 3)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -354,11 +400,11 @@ async.series({
       }
     }).add('sharp-blur-mild', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .blur()
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -369,11 +415,11 @@ async.series({
       }
     }).add('sharp-blur-radius', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .blur(3)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -384,11 +430,11 @@ async.series({
       }
     }).add('sharp-gamma', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .gamma()
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -399,11 +445,11 @@ async.series({
       }
     }).add('sharp-normalise', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .normalise()
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -414,11 +460,11 @@ async.series({
       }
     }).add('sharp-greyscale', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .greyscale()
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -429,12 +475,12 @@ async.series({
       }
     }).add('sharp-greyscale-gamma', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .gamma()
           .greyscale()
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -445,11 +491,11 @@ async.series({
       }
     }).add('sharp-progressive', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .progressive()
-          .toBuffer(function(err, buffer) {
+          .jpeg({ progressive: true })
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -460,11 +506,11 @@ async.series({
       }
     }).add('sharp-without-chroma-subsampling', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .withoutChromaSubsampling()
-          .toBuffer(function(err, buffer) {
+          .jpeg({ chromaSubsampling: '4:4:4' })
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -475,11 +521,11 @@ async.series({
       }
     }).add('sharp-rotate', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .rotate(90)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -490,11 +536,11 @@ async.series({
       }
     }).add('sharp-without-simd', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp.simd(false);
         sharp(inputJpgBuffer)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             sharp.simd(true);
             if (err) {
               throw err;
@@ -506,11 +552,11 @@ async.series({
       }
     }).add('sharp-sequentialRead', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .sequentialRead()
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -521,11 +567,11 @@ async.series({
       }
     }).add('sharp-crop-entropy', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .crop(sharp.strategy.entropy)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -536,11 +582,11 @@ async.series({
       }
     }).add('sharp-crop-attention', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height)
           .crop(sharp.strategy.attention)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -549,21 +595,21 @@ async.series({
             }
           });
       }
-    }).on('cycle', function(event) {
+    }).on('cycle', function (event) {
       console.log('operations ' + String(event.target));
-    }).on('complete', function() {
+    }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
   },
-  // Comparitive speed of kernels
-  kernels: function(callback) {
-    var inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
+  // Comparative speed of kernels
+  kernels: function (callback) {
+    const inputJpgBuffer = fs.readFileSync(fixtures.inputJpg);
     (new Benchmark.Suite('kernels')).add('sharp-cubic', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height, { kernel: 'cubic' })
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -574,10 +620,10 @@ async.series({
       }
     }).add('sharp-lanczos2', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height, { kernel: 'lanczos2' })
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -588,10 +634,10 @@ async.series({
       }
     }).add('sharp-lanczos3', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputJpgBuffer)
           .resize(width, height, { kernel: 'lanczos3' })
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -600,25 +646,25 @@ async.series({
             }
           });
       }
-    }).on('cycle', function(event) {
+    }).on('cycle', function (event) {
       console.log('kernels ' + String(event.target));
-    }).on('complete', function() {
+    }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
   },
   // PNG
-  png: function(callback) {
-    var inputPngBuffer = fs.readFileSync(fixtures.inputPng);
-    var pngSuite = new Benchmark.Suite('png');
+  png: function (callback) {
+    const inputPngBuffer = fs.readFileSync(fixtures.inputPng);
+    const pngSuite = new Benchmark.Suite('png');
     // jimp
     pngSuite.add('jimp-buffer-buffer', {
       defer: true,
-      fn: function(deferred) {
-        new jimp(inputPngBuffer, function(err) {
+      fn: function (deferred) {
+        jimp.read(inputPngBuffer, function (err, image) {
           if (err) {
             throw err;
           } else {
-            this
+            image
               .resize(width, height)
               .getBuffer(jimp.MIME_PNG, function (err) {
                 if (err) {
@@ -632,12 +678,12 @@ async.series({
       }
     }).add('jimp-file-file', {
       defer: true,
-      fn: function(deferred) {
-        new jimp(fixtures.inputPng, function(err) {
+      fn: function (deferred) {
+        jimp.read(fixtures.inputPng, function (err, image) {
           if (err) {
             throw err;
           } else {
-            this
+            image
               .resize(width, height)
               .write(fixtures.outputPng, function (err) {
                 if (err) {
@@ -654,7 +700,7 @@ async.series({
     if (typeof lwip !== 'undefined') {
       pngSuite.add('lwip-buffer-buffer', {
         defer: true,
-        fn: function(deferred) {
+        fn: function (deferred) {
           lwip.open(inputPngBuffer, 'png', function (err, image) {
             if (err) {
               throw err;
@@ -675,17 +721,63 @@ async.series({
         }
       });
     }
+    // mapnik
+    pngSuite.add('mapnik-file-file', {
+      defer: true,
+      fn: function (deferred) {
+        mapnik.Image.open(fixtures.inputPng, function (err, img) {
+          if (err) throw err;
+          img.premultiply(function (err, img) {
+            if (err) throw err;
+            img.resize(width, height, {
+              scaling_method: mapnik.imageScaling.lanczos
+            }, function (err, img) {
+              if (err) throw err;
+              img.demultiply(function (err, img) {
+                if (err) throw err;
+                img.save(fixtures.outputPng, 'png', function (err) {
+                  if (err) throw err;
+                  deferred.resolve();
+                });
+              });
+            });
+          });
+        });
+      }
+    }).add('mapnik-buffer-buffer', {
+      defer: true,
+      fn: function (deferred) {
+        mapnik.Image.fromBytes(inputPngBuffer, { max_size: 3000 }, function (err, img) {
+          if (err) throw err;
+          img.premultiply(function (err, img) {
+            if (err) throw err;
+            img.resize(width, height, {
+              scaling_method: mapnik.imageScaling.lanczos
+            }, function (err, img) {
+              if (err) throw err;
+              img.demultiply(function (err, img) {
+                if (err) throw err;
+                img.encode('png', function (err) {
+                  if (err) throw err;
+                  deferred.resolve();
+                });
+              });
+            });
+          });
+        });
+      }
+    });
     // imagemagick
     pngSuite.add('imagemagick-file-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         imagemagick.resize({
           srcPath: fixtures.inputPng,
           dstPath: fixtures.outputPng,
           width: width,
           height: height,
           filter: 'Lanczos'
-        }, function(err) {
+        }, function (err) {
           if (err) {
             throw err;
           } else {
@@ -698,7 +790,7 @@ async.series({
     if (typeof imagemagickNative !== 'undefined') {
       pngSuite.add('imagemagick-native-buffer-buffer', {
         defer: true,
-        fn: function(deferred) {
+        fn: function (deferred) {
           imagemagickNative.convert({
             srcData: inputPngBuffer,
             width: width,
@@ -713,10 +805,10 @@ async.series({
     // gm
     pngSuite.add('gm-file-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         gm(fixtures.inputPng)
-          .resize(width, height)
           .filter('Lanczos')
+          .resize(width, height)
           .write(fixtures.outputPng, function (err) {
             if (err) {
               throw err;
@@ -727,10 +819,10 @@ async.series({
       }
     }).add('gm-file-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         gm(fixtures.inputPng)
-          .resize(width, height)
           .filter('Lanczos')
+          .resize(width, height)
           .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
@@ -741,13 +833,21 @@ async.series({
           });
       }
     });
+    // images
+    if (typeof images !== 'undefined') {
+      pngSuite.add('images-file-file', function () {
+        images(fixtures.inputPng)
+          .resize(width, height)
+          .save(fixtures.outputPng);
+      });
+    }
     // sharp
     pngSuite.add('sharp-buffer-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputPng, function(err) {
+          .toFile(fixtures.outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -757,10 +857,10 @@ async.series({
       }
     }).add('sharp-buffer-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -771,10 +871,10 @@ async.series({
       }
     }).add('sharp-file-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(fixtures.inputPng)
           .resize(width, height)
-          .toFile(fixtures.outputPng, function(err) {
+          .toFile(fixtures.outputPng, function (err) {
             if (err) {
               throw err;
             } else {
@@ -784,10 +884,10 @@ async.series({
       }
     }).add('sharp-file-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(fixtures.inputPng)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -798,11 +898,11 @@ async.series({
       }
     }).add('sharp-progressive', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .progressive()
-          .toBuffer(function(err, buffer) {
+          .png({ progressive: true })
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -811,13 +911,13 @@ async.series({
             }
           });
       }
-    }).add('sharp-withoutAdaptiveFiltering', {
+    }).add('sharp-adaptiveFiltering', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputPngBuffer)
           .resize(width, height)
-          .withoutAdaptiveFiltering()
-          .toBuffer(function(err, buffer) {
+          .png({ adaptiveFiltering: true })
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -827,21 +927,21 @@ async.series({
           });
       }
     });
-    pngSuite.on('cycle', function(event) {
+    pngSuite.on('cycle', function (event) {
       console.log(' png ' + String(event.target));
-    }).on('complete', function() {
+    }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
   },
   // WebP
-  webp: function(callback) {
-    var inputWebPBuffer = fs.readFileSync(fixtures.inputWebP);
+  webp: function (callback) {
+    const inputWebPBuffer = fs.readFileSync(fixtures.inputWebP);
     (new Benchmark.Suite('webp')).add('sharp-buffer-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputWebPBuffer)
           .resize(width, height)
-          .toFile(fixtures.outputWebP, function(err) {
+          .toFile(fixtures.outputWebP, function (err) {
             if (err) {
               throw err;
             } else {
@@ -851,10 +951,10 @@ async.series({
       }
     }).add('sharp-buffer-buffer', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(inputWebPBuffer)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -865,10 +965,10 @@ async.series({
       }
     }).add('sharp-file-file', {
       defer: true,
-      fn: function(deferred) {
+      fn: function (deferred) {
         sharp(fixtures.inputWebP)
           .resize(width, height)
-          .toFile(fixtures.outputWebP, function(err) {
+          .toFile(fixtures.outputWebP, function (err) {
             if (err) {
               throw err;
             } else {
@@ -878,10 +978,10 @@ async.series({
       }
     }).add('sharp-file-buffer', {
       defer: true,
-      fn: function(deferred) {
-        sharp(fixtures.inputWebp)
+      fn: function (deferred) {
+        sharp(fixtures.inputWebP)
           .resize(width, height)
-          .toBuffer(function(err, buffer) {
+          .toBuffer(function (err, buffer) {
             if (err) {
               throw err;
             } else {
@@ -890,15 +990,15 @@ async.series({
             }
           });
       }
-    }).on('cycle', function(event) {
+    }).on('cycle', function (event) {
       console.log('webp ' + String(event.target));
-    }).on('complete', function() {
+    }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
   }
-}, function(err, results) {
+}, function (err, results) {
   assert(!err, err);
-  Object.keys(results).forEach(function(format) {
+  Object.keys(results).forEach(function (format) {
     if (results[format].toString().substr(0, 5) !== 'sharp') {
       console.log('sharp was slower than ' + results[format] + ' for ' + format);
     }

test/bench/random.js

@@ -1,26 +1,26 @@
 'use strict';
 
-var imagemagick = require('imagemagick');
-var gm = require('gm');
-var assert = require('assert');
-var Benchmark = require('benchmark');
+const imagemagick = require('imagemagick');
+const gm = require('gm');
+const assert = require('assert');
+const Benchmark = require('benchmark');
 
-var sharp = require('../../index');
-var fixtures = require('../fixtures');
+const sharp = require('../../');
+const fixtures = require('../fixtures');
 
 sharp.cache(false);
 sharp.simd(true);
 
-var min = 320;
-var max = 960;
+const min = 320;
+const max = 960;
 
-var randomDimension = function() {
-  return Math.ceil(Math.random() * (max - min) + min);
+const randomDimension = function () {
+  return Math.ceil((Math.random() * (max - min)) + min);
 };
 
 new Benchmark.Suite('random').add('imagemagick', {
   defer: true,
-  fn: function(deferred) {
+  fn: function (deferred) {
     imagemagick.resize({
       srcPath: fixtures.inputJpg,
       dstPath: fixtures.outputJpg,
@@ -29,7 +29,7 @@ new Benchmark.Suite('random').add('imagemagick', {
       height: randomDimension(),
       format: 'jpg',
       filter: 'Lanczos'
-    }, function(err) {
+    }, function (err) {
       if (err) {
         throw err;
       } else {
@@ -39,7 +39,7 @@ new Benchmark.Suite('random').add('imagemagick', {
   }
 }).add('gm', {
   defer: true,
-  fn: function(deferred) {
+  fn: function (deferred) {
     gm(fixtures.inputJpg)
       .resize(randomDimension(), randomDimension())
       .filter('Lanczos')
@@ -55,10 +55,10 @@ new Benchmark.Suite('random').add('imagemagick', {
   }
 }).add('sharp', {
   defer: true,
-  fn: function(deferred) {
+  fn: function (deferred) {
     sharp(fixtures.inputJpg)
       .resize(randomDimension(), randomDimension())
-      .toBuffer(function(err, buffer) {
+      .toBuffer(function (err, buffer) {
         if (err) {
           throw err;
         } else {
@@ -67,9 +67,9 @@ new Benchmark.Suite('random').add('imagemagick', {
         }
       });
   }
-}).on('cycle', function(event) {
+}).on('cycle', function (event) {
   console.log(String(event.target));
-}).on('complete', function() {
-  var winner = this.filter('fastest').map('name');
+}).on('complete', function () {
+  const winner = this.filter('fastest').map('name');
   assert.strictEqual('sharp', String(winner), 'sharp was slower than ' + winner);
 }).run();

test/coverage/report.sh

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