63 lines
1.1 KiB
JavaScript
63 lines
1.1 KiB
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 pngquant = require('pngquant-bin');
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module.exports = opts => buf => {
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opts = Object.assign({}, 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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'--output', execBuffer.output,
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execBuffer.input
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];
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if (opts.floyd && typeof opts.floyd === 'number') {
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args.push(`--floyd=${opts.floyd}`);
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}
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if (opts.floyd && typeof opts.floyd === 'boolean') {
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args.push('--floyd');
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}
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if (opts.nofs) {
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args.push('--nofs');
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}
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if (opts.posterize) {
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args.push('--posterize', opts.posterize);
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}
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if (opts.quality) {
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args.push('--quality', opts.quality);
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}
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if (opts.speed) {
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args.push('--speed', opts.speed);
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}
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if (opts.verbose) {
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args.push('--verbose');
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}
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return execBuffer({
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input: buf,
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bin: pngquant,
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args
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}).catch(err => {
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if (err.code === 99) {
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return buf;
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}
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err.message = err.stderr || err.message;
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throw err;
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});
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};
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