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Editing: pngstream.js
'use strict' /*! * Canvas - PNGStream * Copyright (c) 2010 LearnBoost <tj@learnboost.com> * MIT Licensed */ const { Readable } = require('stream') function noop () {} class PNGStream extends Readable { constructor (canvas, options) { super() if (options && options.palette instanceof Uint8ClampedArray && options.palette.length % 4 !== 0) { throw new Error('Palette length must be a multiple of 4.') } this.canvas = canvas this.options = options || {} } _read () { // For now we're not controlling the c++ code's data emission, so we only // call canvas.streamPNGSync once and let it emit data at will. this._read = noop this.canvas.streamPNGSync((err, chunk, len) => { if (err) { this.emit('error', err) } else if (len) { this.push(chunk) } else { this.push(null) } }, this.options) } } module.exports = PNGStream
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