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Expose PNG output options requiring libimagequant #1484

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Lovell Fuller
2019-01-12 18:26:53 +00:00
parent bd377438b6
commit 98797445de
8 changed files with 211 additions and 74 deletions
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32
lib/output.js
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@@ -221,6 +221,11 @@ function jpeg (options) {
* @param {Boolean} [options.progressive=false] - use progressive (interlace) scan
* @param {Number} [options.compressionLevel=9] - zlib compression level, 0-9
* @param {Boolean} [options.adaptiveFiltering=false] - use adaptive row filtering
* @param {Boolean} [options.palette=false] - quantise to a palette-based image with alpha transparency support, requires libimagequant
* @param {Number} [options.quality=100] - use the lowest number of colours needed to achieve given quality, requires libimagequant
* @param {Number} [options.colours=256] - maximum number of palette entries, requires libimagequant
* @param {Number} [options.colors=256] - alternative spelling of `options.colours`, requires libimagequant
* @param {Number} [options.dither=1.0] - level of Floyd-Steinberg error diffusion, requires libimagequant
* @param {Boolean} [options.force=true] - force PNG output, otherwise attempt to use input format
* @returns {Sharp}
* @throws {Error} Invalid options
@@ -240,6 +245,33 @@ function png (options) {
if (is.defined(options.adaptiveFiltering)) {
this._setBooleanOption('pngAdaptiveFiltering', options.adaptiveFiltering);
}
if (is.defined(options.palette)) {
this._setBooleanOption('pngPalette', options.palette);
if (this.options.pngPalette) {
if (is.defined(options.quality)) {
if (is.integer(options.quality) && is.inRange(options.quality, 0, 100)) {
this.options.pngQuality = options.quality;
} else {
throw is.invalidParameterError('quality', 'integer between 0 and 100', options.quality);
}
}
const colours = options.colours || options.colors;
if (is.defined(colours)) {
if (is.integer(colours) && is.inRange(colours, 2, 256)) {
this.options.pngColours = colours;
} else {
throw is.invalidParameterError('colours', 'integer between 2 and 256', colours);
}
}
if (is.defined(options.dither)) {
if (is.number(options.dither) && is.inRange(options.dither, 0, 1)) {
this.options.pngDither = options.dither;
} else {
throw is.invalidParameterError('dither', 'number between 0.0 and 1.0', options.dither);
}
}
}
}
}
return this._updateFormatOut('png', options);
}