38 lines
802 B
JavaScript
38 lines
802 B
JavaScript
'use strict';
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const execBuffer = require('exec-buffer');
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const advpng = require('advpng-bin');
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const isPng = require('is-png');
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const tempfile = require('tempfile');
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module.exports = opts => buf => {
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opts = Object.assign({optimizationLevel: 3}, opts);
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if (!Buffer.isBuffer(buf)) {
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return Promise.reject(new TypeError(`Expected a \`Buffer\`, got \`${typeof buf}\``));
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}
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if (!isPng(buf)) {
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return Promise.resolve(buf);
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}
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const args = ['--recompress', '-q'];
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const tmp = tempfile();
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if (typeof opts.optimizationLevel === 'number') {
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args.push(`-${opts.optimizationLevel}`);
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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: advpng,
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args,
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inputPath: tmp,
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outputPath: tmp
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}).catch(err => {
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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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