56 lines
935 B
JavaScript
56 lines
935 B
JavaScript
'use strict';
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const execBuffer = require('exec-buffer');
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const isPng = require('is-png');
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const optipng = require('optipng-bin');
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module.exports = opts => buf => {
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opts = Object.assign({
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optimizationLevel: 3,
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bitDepthReduction: true,
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colorTypeReduction: true,
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paletteReduction: true
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}, opts);
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if (!Buffer.isBuffer(buf)) {
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return Promise.reject(new TypeError('Expected a buffer'));
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}
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if (!isPng(buf)) {
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return Promise.resolve(buf);
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}
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const args = [
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'-strip',
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'all',
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'-clobber',
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'-fix',
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'-o',
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opts.optimizationLevel,
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'-out',
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execBuffer.output
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];
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if (!opts.bitDepthReduction) {
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args.push('-nb');
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}
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if (!opts.colorTypeReduction) {
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args.push('-nc');
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}
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if (!opts.paletteReduction) {
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args.push('-np');
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}
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args.push(execBuffer.input);
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return execBuffer({
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input: buf,
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bin: optipng,
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args
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}).catch(error => {
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error.message = error.stderr || error.message;
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throw error;
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});
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};
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