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Expose WebP alpha quality, lossless and near-lossless output options (#685)

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Rahul Nanwani
2017-01-19 19:15:32 +05:30
committed by Lovell Fuller
parent 815d076b35
commit a1b8efe721
9 changed files with 88 additions and 1 deletions
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3
lib/constructor.js
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@@ -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,

16
lib/output.js
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@@ -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);
};