Release v0.17.2

Add use of 'cc' to improve C++ code style linting
Add CLI tools section to installation guide (#691 )
2026-02-04 13:46:19 +01:00 · 2017-02-11 10:35:34 +00:00 · 2017-02-11 09:59:23 +00:00 · 2017-01-25 21:34:23 +00:00 · 2017-01-22 14:03:06 +00:00 · 2017-01-22 13:58:11 +00:00
42 changed files with 633 additions and 622 deletions
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ 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 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.
--- a/binding.gyp
+++ b/binding.gyp
@@ -107,7 +107,7 @@
          ['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 "$(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs-only-L vips-cpp | cut -c 3- | sed -e "s/[[:space:]]*$//" | sed -e "s/^$/\/usr\/lib/")/libvips-cpp.so" | c++filt | grep -qF __cxx11;then echo "1";else echo "0";fi)'
+              '_GLIBCXX_USE_CXX11_ABI=<!(if readelf -Ws "$(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)'
            ]
          }]
        ]
--- a/binding.js
+++ b/binding.js
@@ -98,11 +98,11 @@ module.exports.download_vips = function () {
          } catch (err) {}
        });
      });
-      const gotOpt = {};
-      if (process.env.npm_config_https_proxy) {
-        // Use the NPM-configured HTTPS proxy
-        gotOpt.agent = caw(process.env.npm_config_https_proxy);
-      }
+      const gotOpt = {
+        agent: caw(null, {
+          protocol: 'https'
+        })
+      };
      const url = distBaseUrl + tarFilename;
      got.stream(url, gotOpt).on('response', function (response) {
        if (response.statusCode !== 200) {
--- a/docs/api-channel.md
+++ b/docs/api-channel.md
@@ -1,6 +1,12 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# extractChannel
+### Table of Contents
+
+-   [extractChannel](#extractchannel)
+-   [joinChannel](#joinchannel)
+-   [bandbool](#bandbool)
+
+## extractChannel

 Extract a single channel from a multi-channel image.

@@ -23,7 +29,7 @@ sharp(input)

 Returns **Sharp** 

-# joinChannel
+## joinChannel

 Join one or more channels to the image.
 The meaning of the added channels depends on the output colourspace, set with `toColourspace()`.
@@ -46,7 +52,7 @@ For raw pixel input, the `options` object should contain a `raw` attribute, whic

 Returns **Sharp** 

-# bandbool
+## bandbool

 Perform a bitwise boolean operation on all input image channels (bands) to produce a single channel output image.

--- a/docs/api-colour.md
+++ b/docs/api-colour.md
@@ -1,6 +1,14 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# background
+### Table of Contents
+
+-   [background](#background)
+-   [greyscale](#greyscale)
+-   [grayscale](#grayscale)
+-   [toColourspace](#tocolourspace)
+-   [toColorspace](#tocolorspace)
+
+## 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.
@@ -18,7 +26,7 @@ The alpha value is a float between `0` (transparent) and `1` (opaque).

 Returns **Sharp** 

-# greyscale
+## 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.
@@ -33,7 +41,7 @@ An alpha channel may be present, and will be unchanged by the operation.

 Returns **Sharp** 

-# grayscale
+## grayscale

 Alternative spelling of `greyscale`.

@@ -43,7 +51,7 @@ Alternative spelling of `greyscale`.

 Returns **Sharp** 

-# toColourspace
+## toColourspace

 Set the output colourspace.
 By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
@@ -57,7 +65,7 @@ By default output image will be web-friendly sRGB, with additional channels inte

 Returns **Sharp** 

-# toColorspace
+## toColorspace

 Alternative spelling of `toColourspace`.

--- a/docs/api-composite.md
+++ b/docs/api-composite.md
@@ -1,6 +1,10 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# overlayWith
+### Table of Contents
+
+-   [overlayWith](#overlaywith)
+
+## overlayWith

 Overlay (composite) an image over the processed (resized, extracted etc.) image.

--- a/docs/api-constructor.md
+++ b/docs/api-constructor.md
@@ -1,6 +1,13 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# Sharp
+### Table of Contents
+
+-   [Sharp](#sharp)
+    -   [format](#format)
+    -   [versions](#versions)
+-   [queue](#queue)
+
+## Sharp

 **Parameters**

@@ -43,7 +50,7 @@ readableStream.pipe(transformer).pipe(writableStream);

 Returns **[Sharp](#sharp)** 

-## format
+### format

 An Object containing nested boolean values representing the available input and output formats/methods.

@@ -55,7 +62,7 @@ console.log(sharp.format());

 Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** 

-## versions
+### versions

 An Object containing the version numbers of libvips and its dependencies.

@@ -65,7 +72,7 @@ An Object containing the version numbers of libvips and its dependencies.
 console.log(sharp.versions);
 ```

-# queue
+## queue

 An EventEmitter that emits a `change` event when a task is either:

--- a/docs/api-input.md
+++ b/docs/api-input.md
@@ -1,6 +1,13 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# clone
+### Table of Contents
+
+-   [clone](#clone)
+-   [metadata](#metadata)
+-   [limitInputPixels](#limitinputpixels)
+-   [sequentialRead](#sequentialread)
+
+## clone

 Take a "snapshot" of the Sharp instance, returning a new instance.
 Cloned instances inherit the input of their parent instance.
@@ -19,7 +26,7 @@ readableStream.pipe(pipeline);

 Returns **Sharp** 

-# metadata
+## metadata

 Fast access to image metadata without decoding any compressed image data.
 A Promises/A+ promise is returned when `callback` is not provided.
@@ -59,7 +66,7 @@ image

 Returns **([Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)&lt;[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)> | Sharp)** 

-# limitInputPixels
+## 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.
@@ -74,7 +81,7 @@ The default limit is 268402689 (0x3FFF _ 0x3FFF) pixels.

 Returns **Sharp** 

-# sequentialRead
+## 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.
--- a/docs/api-operation.md
+++ b/docs/api-operation.md
@@ -1,6 +1,25 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# rotate
+### Table of Contents
+
+-   [rotate](#rotate)
+-   [extract](#extract)
+-   [flip](#flip)
+-   [flop](#flop)
+-   [sharpen](#sharpen)
+-   [blur](#blur)
+-   [extend](#extend)
+-   [flatten](#flatten)
+-   [trim](#trim)
+-   [gamma](#gamma)
+-   [negate](#negate)
+-   [normalise](#normalise)
+-   [normalize](#normalize)
+-   [convolve](#convolve)
+-   [threshold](#threshold)
+-   [boolean](#boolean)
+
+## rotate

 Rotate the output image by either an explicit angle
 or auto-orient based on the EXIF `Orientation` tag.
@@ -35,7 +54,7 @@ readableStream.pipe(pipeline);

 Returns **Sharp** 

-# extract
+## extract

 Extract a region of the image.

@@ -75,7 +94,7 @@ sharp(input)

 Returns **Sharp** 

-# flip
+## 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.
@@ -86,7 +105,7 @@ The use of `flip` implies the removal of the EXIF `Orientation` tag, if any.

 Returns **Sharp** 

-# flop
+## 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.
@@ -97,7 +116,7 @@ The use of `flop` implies the removal of the EXIF `Orientation` tag, if any.

 Returns **Sharp** 

-# sharpen
+## sharpen

 Sharpen the image.
 When used without parameters, performs a fast, mild sharpen of the output image.
@@ -115,7 +134,7 @@ Separate control over the level of sharpening in "flat" and "jagged" areas is av

 Returns **Sharp** 

-# blur
+## blur

 Blur the image.
 When used without parameters, performs a fast, mild blur of the output image.
@@ -130,7 +149,7 @@ When a `sigma` is provided, performs a slower, more accurate Gaussian blur.

 Returns **Sharp** 

-# extend
+## 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.
@@ -150,7 +169,7 @@ This operation will always occur after resizing and extraction, if any.
 // 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})
+  .background({r: 0, g: 0, b: 0, alpha: 0})
  .extend({top: 10, bottom: 20, left: 10, right: 10})
  ...
 ```
@@ -159,7 +178,7 @@ sharp(input)

 Returns **Sharp** 

-# flatten
+## flatten

 Merge alpha transparency channel, if any, with `background`.

@@ -169,7 +188,7 @@ Merge alpha transparency channel, if any, with `background`.

 Returns **Sharp** 

-# trim
+## trim

 Trim "boring" pixels from all edges that contain values within a percentage similarity of the top-left pixel.

@@ -182,7 +201,7 @@ Trim "boring" pixels from all edges that contain values within a percentage simi

 Returns **Sharp** 

-# 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`.
@@ -199,7 +218,7 @@ when applying a gamma correction.

 Returns **Sharp** 

-# negate
+## negate

 Produce the "negative" of the image.

@@ -209,7 +228,7 @@ Produce the "negative" of the image.

 Returns **Sharp** 

-# normalise
+## normalise

 Enhance output image contrast by stretching its luminance to cover the full dynamic range.

@@ -219,7 +238,7 @@ Enhance output image contrast by stretching its luminance to cover the full dyna

 Returns **Sharp** 

-# normalize
+## normalize

 Alternative spelling of normalise.

@@ -229,7 +248,7 @@ Alternative spelling of normalise.

 Returns **Sharp** 

-# convolve
+## convolve

 Convolve the image with the specified kernel.

@@ -262,7 +281,7 @@ sharp(input)

 Returns **Sharp** 

-# threshold
+## threshold

 Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.

@@ -278,7 +297,7 @@ Any pixel value greather than or equal to the threshold value will be set to 255

 Returns **Sharp** 

-# boolean
+## boolean

 Perform a bitwise boolean operation with operand image.

--- a/docs/api-output.md
+++ b/docs/api-output.md
@@ -1,6 +1,19 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# toFile
+### Table of Contents
+
+-   [toFile](#tofile)
+-   [toBuffer](#tobuffer)
+-   [withMetadata](#withmetadata)
+-   [jpeg](#jpeg)
+-   [png](#png)
+-   [webp](#webp)
+-   [tiff](#tiff)
+-   [raw](#raw)
+-   [toFormat](#toformat)
+-   [tile](#tile)
+
+## toFile

 Write output image data to a file.

@@ -21,7 +34,7 @@ A Promises/A+ promise is returned when `callback` is not provided.

 Returns **[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)&lt;[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)>** when no callback is provided

-# toBuffer
+## toBuffer

 Write output to a Buffer.
 JPEG, PNG, WebP, and RAW output are supported.
@@ -40,7 +53,7 @@ By default, the format will match the input image, except GIF and SVG input whic

 Returns **[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)&lt;[Buffer](https://nodejs.org/api/buffer.html)>** when no callback is provided

-# withMetadata
+## 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.
@@ -56,7 +69,7 @@ This will also convert to and add a web-friendly sRGB ICC profile.

 Returns **Sharp** 

-# jpeg
+## jpeg

 Use these JPEG options for output image.

@@ -77,7 +90,7 @@ Use these JPEG options for output image.

 Returns **Sharp** 

-# png
+## png

 Use these PNG options for output image.

@@ -94,7 +107,7 @@ Use these PNG options for output image.

 Returns **Sharp** 

-# webp
+## webp

 Use these WebP options for output image.

@@ -102,6 +115,9 @@ Use these WebP options for output image.

 -   `options` **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)?** output options
    -   `options.quality` **[Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)?** quality, integer 1-100 (optional, default `80`)
+    -   `options.alphaQuality` **[Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)?** quality of alpha layer, integer 0-100 (optional, default `100`)
+    -   `options.lossless` **[Boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)?** use lossless compression mode (optional, default `false`)
+    -   `options.nearLossless` **[Boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)?** use near_lossless compression mode (optional, default `false`)
    -   `options.force` **[Boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)?** force WebP output, otherwise attempt to use input format (optional, default `true`)


@@ -109,7 +125,7 @@ Use these WebP options for output image.

 Returns **Sharp** 

-# tiff
+## tiff

 Use these TIFF options for output image.

@@ -124,13 +140,13 @@ Use these TIFF options for output image.

 Returns **Sharp** 

-# raw
+## raw

 Force output to be raw, uncompressed uint8 pixel data.

 Returns **Sharp** 

-# toFormat
+## toFormat

 Force output to a given format.

@@ -144,7 +160,7 @@ Force output to a given format.

 Returns **Sharp** 

-# tile
+## 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.
--- a/docs/api-resize.md
+++ b/docs/api-resize.md
@@ -1,6 +1,16 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# resize
+### Table of Contents
+
+-   [resize](#resize)
+-   [crop](#crop)
+-   [embed](#embed)
+-   [max](#max)
+-   [min](#min)
+-   [ignoreAspectRatio](#ignoreaspectratio)
+-   [withoutEnlargement](#withoutenlargement)
+
+## resize

 Resize image to `width` x `height`.
 By default, the resized image is centre cropped to the exact size specified.
@@ -52,7 +62,7 @@ sharp(inputBuffer)

 Returns **Sharp** 

-# crop
+## crop

 Crop the resized image to the exact size specified, the default behaviour.

@@ -87,7 +97,7 @@ readableStream.pipe(transformer).pipe(writableStream);

 Returns **Sharp** 

-# embed
+## 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.
@@ -100,7 +110,7 @@ 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})
+  .background({r: 0, g: 0, b: 0, alpha: 0})
  .embed()
  .toFormat(sharp.format.webp)
  .toBuffer(function(err, outputBuffer) {
@@ -114,7 +124,7 @@ sharp('input.gif')

 Returns **Sharp** 

-# max
+## 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.
@@ -137,7 +147,7 @@ sharp(inputBuffer)

 Returns **Sharp** 

-# min
+## 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.
@@ -146,14 +156,14 @@ Both `width` and `height` must be provided via `resize` otherwise the behaviour

 Returns **Sharp** 

-# ignoreAspectRatio
+## ignoreAspectRatio

 Ignoring the aspect ratio of the input, stretch the image to
 the exact `width` and/or `height` provided via `resize`.

 Returns **Sharp** 

-# withoutEnlargement
+## 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:
--- a/docs/api-utility.md
+++ b/docs/api-utility.md
@@ -1,6 +1,13 @@
 <!-- Generated by documentation.js. Update this documentation by updating the source code. -->

-# cache
+### Table of Contents
+
+-   [cache](#cache)
+-   [concurrency](#concurrency)
+-   [counters](#counters)
+-   [simd](#simd)
+
+## 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.
@@ -28,7 +35,7 @@ sharp.cache(false);

 Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** 

-# concurrency
+## concurrency

 Gets, or when a concurrency is provided sets,
 the number of threads _libvips'_ should create to process each image.
@@ -54,7 +61,7 @@ sharp.concurrency(0); // 4

 Returns **[Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)** concurrency

-# counters
+## counters

 Provides access to internal task counters.

@@ -69,7 +76,7 @@ const counters = sharp.counters(); // { queue: 2, process: 4 }

 Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** 

-# simd
+## simd

 Get and set use of SIMD vector unit instructions.
 Requires libvips to have been compiled with liborc support.
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -4,6 +4,29 @@

 Requires libvips v8.4.2.

+#### 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.
--- a/docs/index.md
+++ b/docs/index.md
@@ -94,12 +94,15 @@ 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)

 Thank you!

 ### Licence

-Copyright 2013, 2014, 2015, 2016 Lovell Fuller and contributors.
+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.
--- a/docs/install.md
+++ b/docs/install.md
@@ -135,6 +135,11 @@ You can now download your deployment ZIP using `scp` and upload it to Lambda. Be
 * [gulp-responsive](https://www.npmjs.com/package/gulp-responsive)
 * [grunt-sharp](https://www.npmjs.com/package/grunt-sharp)

+
+### CLI tools
+
+* [sharp-cli](https://www.npmjs.com/package/sharp-cli)
+
 ### Security

 Many users of this module process untrusted, user-supplied images,
--- a/lib/constructor.js
+++ b/lib/constructor.js
@@ -145,6 +145,9 @@ const Sharp = function (input, options) {
    pngCompressionLevel: 6,
    pngAdaptiveFiltering: true,
    webpQuality: 80,
+    webpAlphaQuality: 100,
+    webpLossless: false,
+    webpNearLossless: false,
    tiffQuality: 80,
    tileSize: 256,
    tileOverlap: 0,
--- a/lib/input.js
+++ b/lib/input.js
@@ -64,6 +64,12 @@ const _write = function _write (chunk, encoding, callback) {
  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 {
--- a/lib/is.js
+++ b/lib/is.js
@@ -80,6 +80,21 @@ 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,
@@ -90,5 +105,6 @@ module.exports = {
  number: number,
  integer: integer,
  inRange: inRange,
-  inArray: inArray
+  inArray: inArray,
+  invalidParameterError: invalidParameterError
 };
--- a/lib/operation.js
+++ b/lib/operation.js
@@ -186,7 +186,7 @@ const blur = function blur (sigma) {
 * // 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})
+ *   .background({r: 0, g: 0, b: 0, alpha: 0})
 *   .extend({top: 10, bottom: 20, left: 10, right: 10})
 *   ...
 *
--- a/lib/output.js
+++ b/lib/output.js
@@ -168,6 +168,9 @@ const png = function png (options) {
 * Use these WebP options for output image.
 * @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
@@ -180,6 +183,19 @@ const webp = function webp (options) {
      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);
 };

@@ -362,9 +378,9 @@ const _pipeline = function _pipeline (callback) {
    // output=stream
    if (this._isStreamInput()) {
      // output=stream, input=stream
-      this.on('finish', function () {
-        that._flattenBufferIn();
-        sharp.pipeline(that.options, function (err, data, info) {
+      if (this.streamInFinished) {
+        this._flattenBufferIn();
+        sharp.pipeline(this.options, function (err, data, info) {
          if (err) {
            that.emit('error', err);
          } else {
@@ -373,7 +389,20 @@ const _pipeline = function _pipeline (callback) {
          }
          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) {
--- a/lib/resize.js
+++ b/lib/resize.js
@@ -104,7 +104,7 @@ const resize = function resize (width, height, options) {
    if (is.integer(width) && is.inRange(width, 1, this.constructor.maximum.width)) {
      this.options.width = width;
    } else {
-      throw new Error('Invalid width (1 to ' + this.constructor.maximum.width + ') ' + width);
+      throw is.invalidParameterError('width', `integer between 1 and ${this.constructor.maximum.width}`, width);
    }
  } else {
    this.options.width = -1;
@@ -113,7 +113,7 @@ const resize = function resize (width, height, options) {
    if (is.integer(height) && is.inRange(height, 1, this.constructor.maximum.height)) {
      this.options.height = height;
    } else {
-      throw new Error('Invalid height (1 to ' + this.constructor.maximum.height + ') ' + height);
+      throw is.invalidParameterError('height', `integer between 1 and ${this.constructor.maximum.height}`, height);
    }
  } else {
    this.options.height = -1;
@@ -124,7 +124,7 @@ const resize = function resize (width, height, options) {
      if (is.string(kernel[options.kernel])) {
        this.options.kernel = kernel[options.kernel];
      } else {
-        throw new Error('Invalid kernel ' + options.kernel);
+        throw is.invalidParameterError('kernel', 'valid kernel name', options.kernel);
      }
    }
    // Interpolator
@@ -132,7 +132,7 @@ const resize = function resize (width, height, options) {
      if (is.string(interpolator[options.interpolator])) {
        this.options.interpolator = interpolator[options.interpolator];
      } else {
-        throw new Error('Invalid interpolator ' + options.interpolator);
+        throw is.invalidParameterError('interpolator', 'valid interpolator name', options.interpolator);
      }
    }
    // Centre sampling
@@ -185,7 +185,7 @@ const crop = function crop (crop) {
    // Strategy
    this.options.crop = crop;
  } else {
-    throw new Error('Unsupported crop ' + crop);
+    throw is.invalidParameterError('crop', 'valid crop id/name/strategy', crop);
  }
  return this;
 };
@@ -200,7 +200,7 @@ const crop = function crop (crop) {
 * @example
 * sharp('input.gif')
 *   .resize(200, 300)
- *   .background({r: 0, g: 0, b: 0, a: 0})
+ *   .background({r: 0, g: 0, b: 0, alpha: 0})
 *   .embed()
 *   .toFormat(sharp.format.webp)
 *   .toBuffer(function(err, outputBuffer) {
--- a/package.json
+++ b/package.json
@@ -1,8 +1,9 @@
 {
  "name": "sharp",
  "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images",
-  "version": "0.17.0",
+  "version": "0.17.2",
  "author": "Lovell Fuller <npm@lovell.info>",
+  "homepage": "https://github.com/lovell/sharp",
  "contributors": [
    "Pierre Inglebert <pierre.inglebert@gmail.com>",
    "Jonathan Ong <jonathanrichardong@gmail.com>",
@@ -29,11 +30,13 @@
    "Kleis Auke Wolthuizen <info@kleisauke.nl>",
    "Matt Hirsch <mhirsch@media.mit.edu>",
    "Matthias Thoemmes <thoemmes@gmail.com>",
-    "Patrick Paskaris <patrick@paskaris.gr>"
+    "Patrick Paskaris <patrick@paskaris.gr>",
+    "Jérémy Lal <kapouer@melix.org>",
+    "Rahul Nanwani <r.nanwani@gmail.com>"
  ],
  "scripts": {
    "clean": "rm -rf node_modules/ build/ vendor/ coverage/ test/fixtures/output.*",
-    "test": "semistandard && cross-env VIPS_WARNING=0 nyc --reporter=lcov --branches=99 mocha --slow=5000 --timeout=60000 ./test/unit/*.js",
+    "test": "semistandard && cc && cross-env VIPS_WARNING=0 nyc --reporter=lcov --branches=99 mocha --slow=5000 --timeout=60000 ./test/unit/*.js",
    "test-leak": "./test/leak/leak.sh",
    "test-packaging": "./packaging/test-linux-x64.sh",
    "docs": "for m in constructor input resize composite operation colour channel output utility; do documentation build --shallow --format=md lib/$m.js >docs/api-$m.md; done"
@@ -60,22 +63,22 @@
  ],
  "dependencies": {
    "caw": "^2.0.0",
-    "color": "^1.0.2",
-    "got": "^6.6.3",
-    "nan": "^2.4.0",
+    "color": "^1.0.3",
+    "got": "^6.7.1",
+    "nan": "^2.5.1",
    "semver": "^5.3.0",
    "tar": "^2.2.1"
  },
  "devDependencies": {
    "async": "^2.1.4",
-    "bufferutil": "^1.3.0",
-    "cross-env": "^3.1.3",
-    "documentation": "^4.0.0-beta16",
-    "exif-reader": "^1.0.1",
-    "icc": "^0.0.2",
+    "bufferutil": "^2.0.1",
+    "cc": "^1.0.0",
+    "cross-env": "^3.1.4",
+    "documentation": "^4.0.0-beta.18",
+    "exif-reader": "^1.0.2",
+    "icc": "^1.0.0",
    "mocha": "^3.2.0",
-    "node-cpplint": "^0.4.0",
-    "nyc": "^10.0.0",
+    "nyc": "^10.1.2",
    "rimraf": "^2.5.4",
    "semistandard": "^9.2.1",
    "unzip": "^0.1.11"
@@ -91,5 +94,12 @@
    "env": [
      "mocha"
    ]
+  },
+  "cc": {
+    "linelength": "120",
+    "filter": [
+      "build/include",
+      "runtime/indentation_namespace"
+    ]
  }
 }
--- a/packaging/build/lin.sh
+++ b/packaging/build/lin.sh
@@ -16,7 +16,7 @@ export CFLAGS="${FLAGS}"
 export CXXFLAGS="${FLAGS}"

 # Dependency version numbers
-VERSION_ZLIB=1.2.8
+VERSION_ZLIB=1.2.10
 VERSION_FFI=3.2.1
 VERSION_GLIB=2.50.1
 VERSION_XML2=2.9.4
@@ -24,7 +24,7 @@ VERSION_GSF=1.14.40
 VERSION_EXIF=0.6.21
 VERSION_LCMS2=2.8
 VERSION_JPEG=1.5.1
-VERSION_PNG16=1.6.25
+VERSION_PNG16=1.6.28
 VERSION_WEBP=0.5.1
 VERSION_TIFF=4.0.6
 VERSION_ORC=0.4.26
--- a/preinstall.sh
+++ b/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=8.4.2
-vips_version_latest_major_minor=8.4
-vips_version_latest_patch=2
-
-openslide_version_minimum=3.4.0
-openslide_version_latest_major_minor=3.4
-openslide_version_latest_patch=1
-
-install_libvips_from_source() {
-  echo "Compiling libvips $vips_version_latest_major_minor.$vips_version_latest_patch from source"
-  curl -O http://www.vips.ecs.soton.ac.uk/supported/$vips_version_latest_major_minor/vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
-  tar zvxf vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
-  cd vips-$vips_version_latest_major_minor.$vips_version_latest_patch
-  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
--- a/src/common.cc
+++ b/src/common.cc
@@ -1,12 +1,27 @@
+// 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 <node.h>
 #include <node_buffer.h>
+#include <nan.h>
 #include <vips/vips8>

-#include "nan.h"
 #include "common.h"

 using vips::VImage;
@@ -254,8 +269,7 @@ 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));
  }

  /*
@@ -378,23 +392,23 @@ 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;
    }

@@ -421,8 +435,7 @@ 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()));
  }

  /*
@@ -430,8 +443,7 @@ 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()));
  }

  /*
--- a/src/common.h
+++ b/src/common.h
@@ -1,14 +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_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 < 4))
@@ -63,8 +77,7 @@ 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,
--- a/src/metadata.cc
+++ b/src/metadata.cc
@@ -1,9 +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.
+
 #include <numeric>
+#include <vector>

 #include <node.h>
+#include <nan.h>
 #include <vips/vips8>

-#include "nan.h"
 #include "common.h"
 #include "metadata.h"

@@ -11,15 +26,14 @@ 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) {
+    std::vector<v8::Local<v8::Object>> const buffersToPersist)
+    : Nan::AsyncWorker(callback), baton(baton), 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() {}

@@ -72,7 +86,7 @@ class MetadataWorker : public Nan::AsyncWorker {
    vips_thread_shutdown();
  }

-  void HandleOKCallback () {
+  void HandleOKCallback() {
    using Nan::New;
    using Nan::Set;
    Nan::HandleScope();
@@ -99,14 +113,12 @@ 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());
      }
      argv[1] = info;
    }
@@ -116,8 +128,7 @@ 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;

--- a/src/metadata.h
+++ b/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
--- a/src/operations.cc
+++ b/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"
@@ -17,7 +33,7 @@ namespace sharp {
    Assumes alpha channels are already premultiplied and will be unpremultiplied after.
   */
  VImage Composite(VImage src, VImage dst, const int gravity) {
-    if(IsInputValidForComposition(src, dst)) {
+    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.
@@ -28,8 +44,7 @@ namespace sharp {
        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)
-        );
+          ->set("background", background));
      }
      return CompositeImage(src, dst);
    }
@@ -38,7 +53,7 @@ namespace sharp {
  }

  VImage Composite(VImage src, VImage dst, const int x, const int y) {
-    if(IsInputValidForComposition(src, dst)) {
+    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.
@@ -49,8 +64,7 @@ namespace sharp {
        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)
-        );
+          ->set("background", background));
      }
      return CompositeImage(src, dst);
    }
@@ -145,12 +159,11 @@ 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));;
    }

@@ -284,8 +297,8 @@ 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);
    }
  }

@@ -415,12 +428,11 @@ namespace sharp {
      ->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)
-    );
+      ->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;
@@ -485,7 +497,7 @@ 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");
    }

--- a/src/operations.h
+++ b/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_

@@ -78,8 +92,7 @@ namespace sharp {
    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
-  );
+    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
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
@@ -1,15 +1,31 @@
+// 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 <cmath>
-#include <tuple>
-#include <utility>
+#include <map>
 #include <memory>
 #include <numeric>
-#include <map>
+#include <string>
+#include <tuple>
+#include <utility>
+#include <vector>

 #include <vips/vips8>
 #include <node.h>
+#include <nan.h>

-#include "nan.h"
 #include "common.h"
 #include "operations.h"
 #include "pipeline.h"
@@ -18,15 +34,14 @@ class PipelineWorker : public Nan::AsyncWorker {
 public:
  PipelineWorker(
    Nan::Callback *callback, PipelineBaton *baton, Nan::Callback *queueListener,
-    std::vector<v8::Local<v8::Object>> const buffersToPersist
-  ) : Nan::AsyncWorker(callback), baton(baton), queueListener(queueListener), buffersToPersist(buffersToPersist) {
+    std::vector<v8::Local<v8::Object>> const buffersToPersist)
+    : Nan::AsyncWorker(callback), baton(baton), queueListener(queueListener), 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;
-      }
-    );
+      });
  }
  ~PipelineWorker() {}

@@ -84,7 +99,7 @@ class PipelineWorker : public Nan::AsyncWorker {
      }

      // Trim
-      if(baton->trimTolerance != 0) {
+      if (baton->trimTolerance != 0) {
        image = sharp::Trim(image, baton->trimTolerance);
      }

@@ -277,8 +292,7 @@ class PipelineWorker : public Nan::AsyncWorker {
          image = image.icc_transform(
            const_cast<char*>(profileMap[VIPS_INTERPRETATION_sRGB].data()), VImage::option()
            ->set("embedded", TRUE)
-            ->set("intent", VIPS_INTENT_PERCEPTUAL)
-          );
+            ->set("intent", VIPS_INTENT_PERCEPTUAL));
        } catch(...) {
          // Ignore failure of embedded profile
        }
@@ -286,8 +300,7 @@ class PipelineWorker : public Nan::AsyncWorker {
        image = image.icc_transform(
          const_cast<char*>(profileMap[VIPS_INTERPRETATION_sRGB].data()), VImage::option()
          ->set("input_profile", profileMap[VIPS_INTERPRETATION_CMYK].data())
-          ->set("intent", VIPS_INTENT_PERCEPTUAL)
-        );
+          ->set("intent", VIPS_INTENT_PERCEPTUAL));
      }

      // Flatten image to remove alpha channel
@@ -301,8 +314,7 @@ class PipelineWorker : public Nan::AsyncWorker {
          baton->background[2] * multiplier
        };
        image = image.flatten(VImage::option()
-          ->set("background", background)
-        );
+          ->set("background", background));
      }

      // Negate the colours in the image
@@ -325,8 +337,7 @@ class PipelineWorker : public Nan::AsyncWorker {
      if (hasOverlay && !HasAlpha(image)) {
        double const multiplier = sharp::Is16Bit(image.interpretation()) ? 256.0 : 1.0;
        image = image.bandjoin(
-          VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier)
-        );
+          VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier));
      }

      bool const shouldShrink = xshrink > 1 || yshrink > 1;
@@ -380,22 +391,19 @@ class PipelineWorker : public Nan::AsyncWorker {
        // Perform kernel-based reduction
        if (yresidual < 1.0 || xresidual < 1.0) {
          VipsKernel kernel = static_cast<VipsKernel>(
-            vips_enum_from_nick(nullptr, VIPS_TYPE_KERNEL, baton->kernel.data())
-          );
+            vips_enum_from_nick(nullptr, VIPS_TYPE_KERNEL, baton->kernel.data()));
          if (kernel != VIPS_KERNEL_CUBIC && kernel != VIPS_KERNEL_LANCZOS2 && kernel != VIPS_KERNEL_LANCZOS3) {
            throw vips::VError("Unknown kernel");
          }
          if (yresidual < 1.0) {
            image = image.reducev(1.0 / yresidual, VImage::option()
              ->set("kernel", kernel)
-              ->set("centre", baton->centreSampling)
-            );
+              ->set("centre", baton->centreSampling));
          }
          if (xresidual < 1.0) {
            image = image.reduceh(1.0 / xresidual, VImage::option()
              ->set("kernel", kernel)
-              ->set("centre", baton->centreSampling)
-            );
+              ->set("centre", baton->centreSampling));
          }
        }
        // Perform affine enlargement
@@ -403,13 +411,11 @@ class PipelineWorker : public Nan::AsyncWorker {
          vips::VInterpolate interpolator = vips::VInterpolate::new_from_name(baton->interpolator.data());
          if (yresidual > 1.0) {
            image = image.affine({1.0, 0.0, 0.0, yresidual}, VImage::option()
-              ->set("interpolate", interpolator)
-            );
+              ->set("interpolate", interpolator));
          }
          if (xresidual > 1.0) {
            image = image.affine({xresidual, 0.0, 0.0, 1.0}, VImage::option()
-              ->set("interpolate", interpolator)
-            );
+              ->set("interpolate", interpolator));
          }
        }
      }
@@ -433,13 +439,12 @@ class PipelineWorker : public Nan::AsyncWorker {
      }

      // Join additional color channels to the image
-      if(baton->joinChannelIn.size() > 0) {
+      if (baton->joinChannelIn.size() > 0) {
        VImage joinImage;
        ImageType joinImageType = ImageType::UNKNOWN;

-        for(unsigned int i = 0; i < baton->joinChannelIn.size(); i++) {
+        for (unsigned int i = 0; i < baton->joinChannelIn.size(); i++) {
          std::tie(joinImage, joinImageType) = sharp::OpenInput(baton->joinChannelIn[i], baton->accessMethod);
-
          image = image.bandjoin(joinImage);
        }
        image = image.copy(VImage::option()->set("interpretation", baton->colourspace));
@@ -463,8 +468,8 @@ class PipelineWorker : public Nan::AsyncWorker {
            background = { multiplier * (
              0.2126 * baton->background[0] +
              0.7152 * baton->background[1] +
-              0.0722 * baton->background[2]
-            )};
+              0.0722 * baton->background[2])
+            };
          }
          // Add alpha channel to background colour
          if (baton->background[3] < 255.0 || HasAlpha(image)) {
@@ -475,16 +480,14 @@ class PipelineWorker : public Nan::AsyncWorker {
          // Add non-transparent alpha channel, if required
          if (baton->background[3] < 255.0 && !HasAlpha(image)) {
            image = image.bandjoin(
-              VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier)
-            );
+              VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier));
          }
          // Embed
          int left = static_cast<int>(round((baton->width - image.width()) / 2));
          int top = static_cast<int>(round((baton->height - image.height()) / 2));
          image = image.embed(left, top, baton->width, baton->height, VImage::option()
            ->set("extend", VIPS_EXTEND_BACKGROUND)
-            ->set("background", background)
-          );
+            ->set("background", background));
        } else if (baton->canvas != Canvas::IGNORE_ASPECT) {
          // Crop/max/min
          int left;
@@ -492,8 +495,7 @@ class PipelineWorker : public Nan::AsyncWorker {
          if (baton->crop < 9) {
            // Gravity-based crop
            std::tie(left, top) = sharp::CalculateCrop(
-              image.width(), image.height(), baton->width, baton->height, baton->crop
-            );
+              image.width(), image.height(), baton->width, baton->height, baton->crop);
          } else if (baton->crop == 16) {
            // Entropy-based crop
            std::tie(left, top) = sharp::Crop(image, baton->width, baton->height, sharp::EntropyStrategy());
@@ -512,8 +514,7 @@ class PipelineWorker : public Nan::AsyncWorker {
      // Post extraction
      if (baton->topOffsetPost != -1) {
        image = image.extract_area(
-          baton->leftOffsetPost, baton->topOffsetPost, baton->widthPost, baton->heightPost
-        );
+          baton->leftOffsetPost, baton->topOffsetPost, baton->widthPost, baton->heightPost);
      }

      // Extend edges
@@ -533,8 +534,8 @@ class PipelineWorker : public Nan::AsyncWorker {
          background = { multiplier * (
            0.2126 * baton->background[0] +
            0.7152 * baton->background[1] +
-            0.0722 * baton->background[2]
-          )};
+            0.0722 * baton->background[2])
+          };
        }
        // Add alpha channel to background colour
        if (baton->background[3] < 255.0 || HasAlpha(image)) {
@@ -545,8 +546,7 @@ class PipelineWorker : public Nan::AsyncWorker {
        // Add non-transparent alpha channel, if required
        if (baton->background[3] < 255.0 && !HasAlpha(image)) {
          image = image.bandjoin(
-            VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier)
-          );
+            VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier));
        }
        // Embed
        baton->width = image.width() + baton->extendLeft + baton->extendRight;
@@ -571,8 +571,7 @@ class PipelineWorker : public Nan::AsyncWorker {
        image = sharp::Convolve(image,
          baton->convKernelWidth, baton->convKernelHeight,
          baton->convKernelScale, baton->convKernelOffset,
-          baton->convKernel
-        );
+          baton->convKernel);
      }

      // Sharpen
@@ -606,17 +605,13 @@ class PipelineWorker : public Nan::AsyncWorker {
              // the overlayX/YOffsets will now be used to CalculateCrop for extract_area
              std::tie(left, top) = sharp::CalculateCrop(
                overlayImage.width(), overlayImage.height(), image.width(), image.height(),
-                baton->overlayXOffset, baton->overlayYOffset
-              );
+                baton->overlayXOffset, baton->overlayYOffset);
            } else {
              // the overlayGravity will now be used to CalculateCrop for extract_area
              std::tie(left, top) = sharp::CalculateCrop(
-                overlayImage.width(), overlayImage.height(), image.width(), image.height(), baton->overlayGravity
-              );
+                overlayImage.width(), overlayImage.height(), image.width(), image.height(), baton->overlayGravity);
            }
-            overlayImage = overlayImage.extract_area(
-              left, top, image.width(), image.height()
-            );
+            overlayImage = overlayImage.extract_area(left, top, image.width(), image.height());
          }
          // the overlayGravity was used for extract_area, therefore set it back to its default value of 0
          baton->overlayGravity = 0;
@@ -629,15 +624,13 @@ class PipelineWorker : public Nan::AsyncWorker {
          if (!HasAlpha(overlayImage)) {
            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)
-            );
+              VImage::new_matrix(overlayImage.width(), overlayImage.height()).new_from_image(255 * multiplier));
          }
          // Ensure image has alpha channel
          if (!HasAlpha(image)) {
            double const multiplier = sharp::Is16Bit(image.interpretation()) ? 256.0 : 1.0;
            image = image.bandjoin(
-              VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier)
-            );
+              VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier));
          }
          // Ensure overlay is premultiplied sRGB
          overlayImage = overlayImage.colourspace(VIPS_INTERPRETATION_sRGB).premultiply();
@@ -686,8 +679,8 @@ class PipelineWorker : public Nan::AsyncWorker {
      }

      // Extract an image channel (aka vips band)
-      if(baton->extractChannel > -1) {
-        if(baton->extractChannel >= image.bands()) {
+      if (baton->extractChannel > -1) {
+        if (baton->extractChannel >= image.bands()) {
          (baton->err).append("Cannot extract channel from image. Too few channels in image.");
          return Error();
        }
@@ -701,12 +694,9 @@ class PipelineWorker : public Nan::AsyncWorker {
        // Convert colourspace, pass the current known interpretation so libvips doesn't have to guess
        image = image.colourspace(baton->colourspace, VImage::option()->set("source_space", image.interpretation()));
        // Transform colours from embedded profile to output profile
-        if (baton->withMetadata &&
-            sharp::HasProfile(image) &&
-            profileMap[baton->colourspace] != std::string()) {
+        if (baton->withMetadata && sharp::HasProfile(image) && profileMap[baton->colourspace] != std::string()) {
          image = image.icc_transform(const_cast<char*>(profileMap[baton->colourspace].data()),
-            VImage::option()->set("embedded", TRUE)
-          );
+            VImage::option()->set("embedded", TRUE));
        }
      }

@@ -732,14 +722,13 @@ class PipelineWorker : public Nan::AsyncWorker {
            ->set("trellis_quant", baton->jpegTrellisQuantisation)
            ->set("overshoot_deringing", baton->jpegOvershootDeringing)
            ->set("optimize_scans", baton->jpegOptimiseScans)
-            ->set("optimize_coding", TRUE)
-          ));
+            ->set("optimize_coding", TRUE)));
          baton->bufferOut = static_cast<char*>(area->data);
          baton->bufferOutLength = area->length;
          area->free_fn = nullptr;
          vips_area_unref(area);
          baton->formatOut = "jpeg";
-          if(baton->colourspace == VIPS_INTERPRETATION_CMYK) {
+          if (baton->colourspace == VIPS_INTERPRETATION_CMYK) {
            baton->channels = std::min(baton->channels, 4);
          } else {
            baton->channels = std::min(baton->channels, 3);
@@ -754,9 +743,7 @@ class PipelineWorker : public Nan::AsyncWorker {
          VipsArea *area = VIPS_AREA(image.pngsave_buffer(VImage::option()
            ->set("interlace", baton->pngProgressive)
            ->set("compression", baton->pngCompressionLevel)
-            ->set("filter", baton->pngAdaptiveFiltering ?
-              VIPS_FOREIGN_PNG_FILTER_ALL : VIPS_FOREIGN_PNG_FILTER_NONE )
-          ));
+            ->set("filter", baton->pngAdaptiveFiltering ? VIPS_FOREIGN_PNG_FILTER_ALL : VIPS_FOREIGN_PNG_FILTER_NONE)));
          baton->bufferOut = static_cast<char*>(area->data);
          baton->bufferOutLength = area->length;
          area->free_fn = nullptr;
@@ -767,7 +754,9 @@ class PipelineWorker : public Nan::AsyncWorker {
          VipsArea *area = VIPS_AREA(image.webpsave_buffer(VImage::option()
            ->set("strip", !baton->withMetadata)
            ->set("Q", baton->webpQuality)
-          ));
+            ->set("lossless", baton->webpLossless)
+            ->set("near_lossless", baton->webpNearLossless)
+            ->set("alpha_q", baton->webpAlphaQuality)));
          baton->bufferOut = static_cast<char*>(area->data);
          baton->bufferOutLength = area->length;
          area->free_fn = nullptr;
@@ -821,8 +810,7 @@ class PipelineWorker : public Nan::AsyncWorker {
            ->set("trellis_quant", baton->jpegTrellisQuantisation)
            ->set("overshoot_deringing", baton->jpegOvershootDeringing)
            ->set("optimize_scans", baton->jpegOptimiseScans)
-            ->set("optimize_coding", TRUE)
-          );
+            ->set("optimize_coding", TRUE));
          baton->formatOut = "jpeg";
          baton->channels = std::min(baton->channels, 3);
        } else if (baton->formatOut == "png" || isPng || (matchInput &&
@@ -835,24 +823,23 @@ class PipelineWorker : public Nan::AsyncWorker {
          image.pngsave(const_cast<char*>(baton->fileOut.data()), VImage::option()
            ->set("interlace", baton->pngProgressive)
            ->set("compression", baton->pngCompressionLevel)
-            ->set("filter", baton->pngAdaptiveFiltering ?
-              VIPS_FOREIGN_PNG_FILTER_ALL : VIPS_FOREIGN_PNG_FILTER_NONE )
-          );
+            ->set("filter", baton->pngAdaptiveFiltering ? VIPS_FOREIGN_PNG_FILTER_ALL : VIPS_FOREIGN_PNG_FILTER_NONE));
          baton->formatOut = "png";
        } else if (baton->formatOut == "webp" || isWebp || (matchInput && inputImageType == ImageType::WEBP)) {
          // Write WEBP to file
          image.webpsave(const_cast<char*>(baton->fileOut.data()), VImage::option()
            ->set("strip", !baton->withMetadata)
            ->set("Q", baton->webpQuality)
-          );
+            ->set("lossless", baton->webpLossless)
+            ->set("near_lossless", baton->webpNearLossless)
+            ->set("alpha_q", baton->webpAlphaQuality));
          baton->formatOut = "webp";
        } else if (baton->formatOut == "tiff" || isTiff || (matchInput && inputImageType == ImageType::TIFF)) {
          // Write TIFF to file
          image.tiffsave(const_cast<char*>(baton->fileOut.data()), VImage::option()
            ->set("strip", !baton->withMetadata)
            ->set("Q", baton->tiffQuality)
-            ->set("compression", VIPS_FOREIGN_TIFF_COMPRESSION_JPEG)
-          );
+            ->set("compression", VIPS_FOREIGN_TIFF_COMPRESSION_JPEG));
          baton->formatOut = "tiff";
          baton->channels = std::min(baton->channels, 3);
        } else if (baton->formatOut == "dz" || isDz || isDzZip) {
@@ -870,7 +857,10 @@ class PipelineWorker : public Nan::AsyncWorker {
            suffix = AssembleSuffixString(".png", options);
          } else if (baton->tileFormat == "webp") {
            std::vector<std::pair<std::string, std::string>> options {
-              {"Q", std::to_string(baton->webpQuality)}
+              {"Q", std::to_string(baton->webpQuality)},
+              {"alpha_q", std::to_string(baton->webpAlphaQuality)},
+              {"lossless", baton->webpLossless ? "TRUE" : "FALSE"},
+              {"near_lossless", baton->webpNearLossless ? "TRUE" : "FALSE"}
            };
            suffix = AssembleSuffixString(".webp", options);
          } else {
@@ -895,14 +885,12 @@ class PipelineWorker : public Nan::AsyncWorker {
            ->set("overlap", baton->tileOverlap)
            ->set("container", baton->tileContainer)
            ->set("layout", baton->tileLayout)
-            ->set("suffix", const_cast<char*>(suffix.data()))
-          );
+            ->set("suffix", const_cast<char*>(suffix.data())));
          baton->formatOut = "dz";
        } else if (baton->formatOut == "v" || isV || (matchInput && inputImageType == ImageType::VIPS)) {
          // Write V to file
          image.vipssave(const_cast<char*>(baton->fileOut.data()), VImage::option()
-            ->set("strip", !baton->withMetadata)
-          );
+            ->set("strip", !baton->withMetadata));
          baton->formatOut = "v";
        } else {
          // Unsupported output format
@@ -918,7 +906,7 @@ class PipelineWorker : public Nan::AsyncWorker {
    vips_thread_shutdown();
  }

-  void HandleOKCallback () {
+  void HandleOKCallback() {
    using Nan::New;
    using Nan::Set;
    Nan::HandleScope();
@@ -952,8 +940,8 @@ class PipelineWorker : public Nan::AsyncWorker {
      if (baton->bufferOutLength > 0) {
        // Pass ownership of output data to Buffer instance
        argv[1] = Nan::NewBuffer(
-          static_cast<char*>(baton->bufferOut), baton->bufferOutLength, sharp::FreeCallback, nullptr
-        ).ToLocalChecked();
+          static_cast<char*>(baton->bufferOut), baton->bufferOutLength, sharp::FreeCallback, nullptr)
+          .ToLocalChecked();
        // Add buffer size to info
        Set(info, New("size").ToLocalChecked(), New<v8::Uint32>(static_cast<uint32_t>(baton->bufferOutLength)));
        argv[2] = info;
@@ -972,16 +960,14 @@ class PipelineWorker : 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->overlay;
    delete baton->boolean;
    for_each(baton->joinChannelIn.begin(), baton->joinChannelIn.end(),
      [this](sharp::InputDescriptor *joinChannelIn) {
        delete joinChannelIn;
-      }
-    );
+      });
    delete baton;

    // Decrement processing task counter
@@ -1012,7 +998,7 @@ class PipelineWorker : public Nan::AsyncWorker {
    bool flip = FALSE;
    bool flop = FALSE;
    if (angle == -1) {
-      switch(sharp::ExifOrientation(image)) {
+      switch (sharp::ExifOrientation(image)) {
        case 6: rotate = VIPS_ANGLE_D90; break;
        case 3: rotate = VIPS_ANGLE_D180; break;
        case 8: rotate = VIPS_ANGLE_D270; break;
@@ -1132,12 +1118,12 @@ NAN_METHOD(pipeline) {
  baton->interpolator = AttrAsStr(options, "interpolator");
  baton->centreSampling = AttrTo<bool>(options, "centreSampling");
  // Join Channel Options
-  if(HasAttr(options, "joinChannelIn")) {
+  if (HasAttr(options, "joinChannelIn")) {
    v8::Local<v8::Object> joinChannelObject = Nan::Get(options, Nan::New("joinChannelIn").ToLocalChecked())
      .ToLocalChecked().As<v8::Object>();
    v8::Local<v8::Array> joinChannelArray = joinChannelObject.As<v8::Array>();
    int joinChannelArrayLength = AttrTo<int32_t>(joinChannelObject, "length");
-    for(int i = 0; i < joinChannelArrayLength; i++) {
+    for (int i = 0; i < joinChannelArrayLength; i++) {
      baton->joinChannelIn.push_back(
        CreateInputDescriptor(
          Nan::Get(joinChannelArray, i).ToLocalChecked().As<v8::Object>(),
@@ -1154,7 +1140,7 @@ NAN_METHOD(pipeline) {
  baton->threshold = AttrTo<int32_t>(options, "threshold");
  baton->thresholdGrayscale = AttrTo<bool>(options, "thresholdGrayscale");
  baton->trimTolerance = AttrTo<int32_t>(options, "trimTolerance");
-  if(baton->accessMethod == VIPS_ACCESS_SEQUENTIAL && baton->trimTolerance != 0) {
+  if (baton->accessMethod == VIPS_ACCESS_SEQUENTIAL && baton->trimTolerance != 0) {
    baton->accessMethod = VIPS_ACCESS_RANDOM;
  }
  baton->gamma = AttrTo<double>(options, "gamma");
@@ -1209,6 +1195,9 @@ NAN_METHOD(pipeline) {
  baton->pngCompressionLevel = AttrTo<uint32_t>(options, "pngCompressionLevel");
  baton->pngAdaptiveFiltering = AttrTo<bool>(options, "pngAdaptiveFiltering");
  baton->webpQuality = AttrTo<uint32_t>(options, "webpQuality");
+  baton->webpAlphaQuality = AttrTo<uint32_t>(options, "webpAlphaQuality");
+  baton->webpLossless = AttrTo<bool>(options, "webpLossless");
+  baton->webpNearLossless = AttrTo<bool>(options, "webpNearLossless");
  baton->tiffQuality = AttrTo<uint32_t>(options, "tiffQuality");
  // Tile output
  baton->tileSize = AttrTo<uint32_t>(options, "tileSize");
--- a/src/pipeline.h
+++ b/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);

@@ -84,6 +100,9 @@ struct PipelineBaton {
  int pngCompressionLevel;
  bool pngAdaptiveFiltering;
  int webpQuality;
+  int webpAlphaQuality;
+  bool webpNearLossless;
+  bool webpLossless;
  int tiffQuality;
  std::string err;
  bool withMetadata;
--- a/src/sharp.cc
+++ b/src/sharp.cc
@@ -1,7 +1,20 @@
-#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"
--- a/src/utilities.cc
+++ b/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()));
--- a/src/utilities.h
+++ b/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);
--- a/test/fixtures/expected/webp-alpha-80.webp
+++ b/test/fixtures/expected/webp-alpha-80.webp
--- a/test/fixtures/expected/webp-lossless.webp
+++ b/test/fixtures/expected/webp-lossless.webp
--- a/test/fixtures/expected/webp-near-lossless-50.webp
+++ b/test/fixtures/expected/webp-near-lossless-50.webp
--- a/test/unit/cpplint.js
+++ b/test/unit/cpplint.js
@@ -1,48 +0,0 @@
-'use strict';
-
-const fs = require('fs');
-const path = require('path');
-const assert = require('assert');
-
-const cpplint = require('node-cpplint/lib/');
-
-describe('cpplint', function () {
-  // Ignore cpplint failures, possibly newline-related, on Windows
-  if (process.platform !== 'win32') {
-    // List C++ source files
-    fs.readdirSync(path.join(__dirname, '..', '..', 'src')).filter(function (source) {
-      return source !== 'libvips';
-    }).forEach(function (source) {
-      const file = path.join('src', source);
-      it(file, function (done) {
-        // Lint each source file
-        cpplint({
-          files: [file],
-          linelength: 120,
-          filters: {
-            legal: {
-              copyright: false
-            },
-            build: {
-              include: false
-            },
-            whitespace: {
-              parens: false
-            },
-            runtime: {
-              indentation_namespace: false
-            }
-          }
-        }, function (err, report) {
-          if (err) {
-            throw err;
-          }
-          const expected = {};
-          expected[file] = [];
-          assert.deepEqual(expected, report);
-          done();
-        });
-      });
-    });
-  }
-});
--- a/test/unit/crop.js
+++ b/test/unit/crop.js
@@ -141,16 +141,16 @@ describe('Crop', function () {
  it('Invalid values fail', function () {
    assert.throws(function () {
      sharp().crop(9);
-    });
+    }, /Expected valid crop id\/name\/strategy for crop but received 9 of type number/);
    assert.throws(function () {
      sharp().crop(1.1);
-    });
+    }, /Expected valid crop id\/name\/strategy for crop but received 1.1 of type number/);
    assert.throws(function () {
      sharp().crop(-1);
-    });
+    }, /Expected valid crop id\/name\/strategy for crop but received -1 of type number/);
    assert.throws(function () {
      sharp().crop('zoinks');
-    });
+    }, /Expected valid crop id\/name\/strategy for crop but received zoinks of type string/);
  });

  it('Uses default value when none specified', function () {
--- a/test/unit/io.js
+++ b/test/unit/io.js
@@ -157,6 +157,28 @@ describe('Input/output', function () {
    readableButNotAnImage.pipe(writable);
  });

+  it('Readable side of Stream can start flowing after Writable side has finished', function (done) {
+    const readable = fs.createReadStream(fixtures.inputJpg);
+    const writable = fs.createWriteStream(fixtures.outputJpg);
+    writable.on('finish', function () {
+      sharp(fixtures.outputJpg).toBuffer(function (err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(true, data.length > 0);
+        assert.strictEqual(data.length, info.size);
+        assert.strictEqual('jpeg', info.format);
+        assert.strictEqual(320, info.width);
+        assert.strictEqual(240, info.height);
+        fs.unlinkSync(fixtures.outputJpg);
+        done();
+      });
+    });
+    const pipeline = sharp().resize(320, 240);
+    readable.pipe(pipeline);
+    pipeline.on('finish', function () {
+      pipeline.pipe(writable);
+    });
+  });
+
  it('Sequential read, force JPEG', function (done) {
    sharp(fixtures.inputJpg)
      .sequentialRead()
@@ -372,6 +394,50 @@ describe('Input/output', function () {
          done();
        });
    });
+
+    it('should work for webp alpha quality', function (done) {
+      sharp(fixtures.inputPngAlphaPremultiplicationSmall)
+        .webp({alphaQuality: 80})
+        .toBuffer(function (err, data, info) {
+          if (err) throw err;
+          assert.strictEqual(true, data.length > 0);
+          assert.strictEqual('webp', info.format);
+          fixtures.assertSimilar(fixtures.expected('webp-alpha-80.webp'), data, done);
+        });
+    });
+
+    it('should work for webp lossless', function (done) {
+      sharp(fixtures.inputPngAlphaPremultiplicationSmall)
+        .webp({lossless: true})
+        .toBuffer(function (err, data, info) {
+          if (err) throw err;
+          assert.strictEqual(true, data.length > 0);
+          assert.strictEqual('webp', info.format);
+          fixtures.assertSimilar(fixtures.expected('webp-lossless.webp'), data, done);
+        });
+    });
+
+    it('should work for webp near-lossless', function (done) {
+      sharp(fixtures.inputPngAlphaPremultiplicationSmall)
+        .webp({nearLossless: true, quality: 50})
+        .toBuffer(function (err50, data50, info50) {
+          if (err50) throw err50;
+          assert.strictEqual(true, data50.length > 0);
+          assert.strictEqual('webp', info50.format);
+          fixtures.assertSimilar(fixtures.expected('webp-near-lossless-50.webp'), data50, done);
+        });
+    });
+
+    it('should use near-lossless when both lossless and nearLossless are specified', function (done) {
+      sharp(fixtures.inputPngAlphaPremultiplicationSmall)
+        .webp({nearLossless: true, quality: 50, lossless: true})
+        .toBuffer(function (err50, data50, info50) {
+          if (err50) throw err50;
+          assert.strictEqual(true, data50.length > 0);
+          assert.strictEqual('webp', info50.format);
+          fixtures.assertSimilar(fixtures.expected('webp-near-lossless-50.webp'), data50, done);
+        });
+    });
  }

  it('Invalid output format', function (done) {
@@ -735,6 +801,12 @@ describe('Input/output', function () {
    });
  });

+  it('Invalid WebP alpha quality throws error', function () {
+    assert.throws(function () {
+      sharp().webp({ alphaQuality: 101 });
+    });
+  });
+
  it('Invalid TIFF quality throws error', function () {
    assert.throws(function () {
      sharp().tiff({ quality: 101 });
--- a/test/unit/resize.js
+++ b/test/unit/resize.js
@@ -66,37 +66,37 @@ describe('Resize dimensions', function () {
  it('Invalid width - NaN', function () {
    assert.throws(function () {
      sharp().resize('spoons', 240);
-    });
+    }, /Expected integer between 1 and 16383 for width but received spoons of type string/);
  });

  it('Invalid height - NaN', function () {
    assert.throws(function () {
      sharp().resize(320, 'spoons');
-    });
+    }, /Expected integer between 1 and 16383 for height but received spoons of type string/);
  });

  it('Invalid width - float', function () {
    assert.throws(function () {
      sharp().resize(1.5, 240);
-    });
+    }, /Expected integer between 1 and 16383 for width but received 1.5 of type number/);
  });

  it('Invalid height - float', function () {
    assert.throws(function () {
      sharp().resize(320, 1.5);
-    });
+    }, /Expected integer between 1 and 16383 for height but received 1.5 of type number/);
  });

  it('Invalid width - too large', function () {
    assert.throws(function () {
      sharp().resize(0x4000, 240);
-    });
+    }, /Expected integer between 1 and 16383 for width but received 16384 of type number/);
  });

  it('Invalid height - too large', function () {
    assert.throws(function () {
      sharp().resize(320, 0x4000);
-    });
+    }, /Expected integer between 1 and 16383 for height but received 16384 of type number/);
  });

  it('WebP shrink-on-load rounds to zero, ensure recalculation is correct', function (done) {
Author	SHA1	Message	Date
Lovell Fuller	142c431745	Release v0.17.2	2017-02-11 10:35:34 +00:00
Lovell Fuller	81f5589411	Add use of 'cc' to improve C++ code style linting	2017-02-11 09:59:23 +00:00
Mark van Seventer	04f5c884a4	Add CLI tools section to installation guide (#691 )	2017-01-25 21:34:23 +00:00
Lovell Fuller	d8df503404	Ensure Readable can start flowing after Writable finish #671	2017-01-22 14:03:06 +00:00
Lovell Fuller	d241efcdbe	Add changelog entry and credit for #685	2017-01-22 13:58:11 +00:00
Rahul Nanwani	a1b8efe721	Expose WebP alpha quality, lossless and near-lossless output options (#685 )	2017-01-19 13:45:32 +00:00
Lovell Fuller	815d076b35	Release v0.17.1	2017-01-15 15:23:49 +00:00
Lovell Fuller	86b4816b3f	Allow HTTP-over-HTTPS proxy when d/l pre-compiled deps #679	2017-01-14 11:23:13 +00:00
Lovell Fuller	473055468a	Docs: ensure alpha attribute is used for transparency	2017-01-13 21:24:57 +00:00
Brandon Aaron	c6a28db8b1	Packaging: bump zlib to 1.2.10 and png16 to 1.6.28 (#676 )	2017-01-10 18:19:23 +00:00
子龙山人	971f567571	Docs: correct alpha attribute in extend background example (#675 )	2017-01-09 10:47:02 +00:00
Lovell Fuller	7e2eca3d1e	Credit recent new contributors, thank you!	2017-01-05 22:27:30 +00:00
Lovell Fuller	86b0053bf0	Removed preinstall.sh script	2017-01-05 22:21:41 +00:00
Lovell Fuller	cfc4b282f0	Doc refresh for `d9b667e`	2017-01-05 22:20:33 +00:00
Lovell Fuller	b85d2aa565	Merge branch 'master' of https://github.com/lovell/sharp	2017-01-05 22:17:16 +00:00
Lovell Fuller	70a3d4fb5e	Improve error messages for invalid resize parameters Dependency version bumps and doc refresh	2017-01-05 22:17:04 +00:00
Adam Coyne	d9b667e346	Docs: remove parentheses from sharp.format (#663 )	2016-12-31 19:32:18 +00:00
Jérémy Lal	3a1db53d5a	Simpler expression for finding vips-cpp libdir (#656 ) Fixes: #655	2016-12-18 08:57:50 +00:00