mirror of
https://github.com/scratchfoundation/paper.js.git
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56 lines
2 KiB
JavaScript
56 lines
2 KiB
JavaScript
/*
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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
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* http://paperjs.org/
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*
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* Copyright (c) 2011 - 2016, Juerg Lehni & Jonathan Puckey
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* http://scratchdisk.com/ & http://jonathanpuckey.com/
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*
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* Distributed under the MIT license. See LICENSE file for details.
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*
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* All rights reserved.
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*/
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var Canvas = require('canvas'),
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idlUtils = require('jsdom/lib/jsdom/living/generated/utils');
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// Add some useful extensions to HTMLCanvasElement:
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// - HTMLCanvasElement#type, so we can switch to a PDF canvas
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// - Various Node Canvas methods, routed through from HTMLCanvasElement:
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// toBuffer, pngStream, createPNGStream, jpgStream, createJPGStream
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module.exports = function(window) {
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var HTMLCanvasElement = window.HTMLCanvasElement;
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function getImplementation(obj) {
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// Try implForWrapper() first, fall back on obj. This appears to be
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// necessary on v7.2.2, but not anymore once we can switch to 8.0.0
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var impl = idlUtils.implForWrapper(obj);
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return impl && impl._canvas ? impl : obj;
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}
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// Add fake HTMLCanvasElement#type property:
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Object.defineProperty(HTMLCanvasElement.prototype, 'type', {
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get: function() {
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var canvas = getImplementation(this)._canvas;
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return canvas && canvas.type || 'image';
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},
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set: function(type) {
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// Allow replacement of internal node-canvas, so we can switch to a
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// PDF canvas.
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var impl = getImplementation(this),
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size = impl._canvas || impl;
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impl._canvas = new Canvas(size.width, size.height, type);
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impl._context = null;
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}
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});
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// Extend HTMLCanvasElement with useful methods from the underlying Canvas:
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['toBuffer', 'pngStream', 'createPNGStream', 'jpgStream', 'createJPGStream']
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.forEach(function(key) {
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HTMLCanvasElement.prototype[key] = function() {
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var canvas = getImplementation(this)._canvas;
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return canvas[key].apply(canvas, arguments);
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};
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});
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};
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