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Expose mozjpeg quant_table flag (#1285)

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This commit is contained in:
Espen Hovlandsdal
2018-07-10 16:56:05 +02:00
committed by Lovell Fuller
parent 5cb35485f1
commit 7bbc5176a1
6 changed files with 62 additions and 0 deletions
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10
lib/output.js
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@@ -150,6 +150,8 @@ function withMetadata (withMetadata) {
* @param {Boolean} [options.optimizeScans=false] - alternative spelling of optimiseScans
* @param {Boolean} [options.optimiseCoding=true] - optimise Huffman coding tables
* @param {Boolean} [options.optimizeCoding=true] - alternative spelling of optimiseCoding
* @param {Number} [options.quantisationTable=0] - quantization table to use, integer 0-8, requires mozjpeg
* @param {Number} [options.quantizationTable=0] - alternative spelling of quantisationTable
* @param {Boolean} [options.force=true] - force JPEG output, otherwise attempt to use input format
* @returns {Sharp}
* @throws {Error} Invalid options
@@ -191,6 +193,14 @@ function jpeg (options) {
if (is.defined(options.optimiseCoding)) {
this._setBooleanOption('jpegOptimiseCoding', options.optimiseCoding);
}
options.quantisationTable = is.number(options.quantizationTable) ? options.quantizationTable : options.quantisationTable;
if (is.defined(options.quantisationTable)) {
if (is.integer(options.quantisationTable) && is.inRange(options.quantisationTable, 0, 8)) {
this.options.jpegQuantisationTable = options.quantisationTable;
} else {
throw new Error('Invalid quantisation table (integer, 0-8) ' + options.quantisationTable);
}
}
}
return this._updateFormatOut('jpeg', options);
}