71 lines
1.3 KiB
JavaScript
Vendored
71 lines
1.3 KiB
JavaScript
Vendored
'use strict';
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const execa = require('execa');
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const isPng = require('is-png');
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const isStream = require('is-stream');
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const pngquant = require('pngquant-bin');
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module.exports = opts => input => {
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opts = Object.assign({}, opts);
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const isBuffer = Buffer.isBuffer(input);
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if (!isBuffer && !isStream(input)) {
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return Promise.reject(new TypeError(`Expected a Buffer or Stream, got ${typeof input}`));
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}
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if (isBuffer && !isPng(input)) {
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return Promise.resolve(input);
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}
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const args = ['-'];
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if (opts.floyd && typeof opts.floyd === 'number') {
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args.push(`--floyd=${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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const cp = execa(pngquant, args, {
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encoding: null,
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input
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});
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const promise = cp
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.then(res => res.stdout)
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.catch(err => {
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if (err.code === 99) {
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return input;
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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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cp.stdout.then = promise.then.bind(promise);
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cp.stdout.catch = promise.catch.bind(promise);
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return cp.stdout;
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};
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