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52 lines
919 B
52 lines
919 B
'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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|
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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', 'all', |
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'-clobber', |
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'-fix', |
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'-o', opts.optimizationLevel, |
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'-out', 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(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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