paper.js/src/canvas/CanvasProvider.js

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/*
* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
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* http://paperjs.org/
*
* Copyright (c) 2011 - 2013, Juerg Lehni & Jonathan Puckey
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* http://lehni.org/ & http://jonathanpuckey.com/
*
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* Distributed under the MIT license. See LICENSE file for details.
*
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* All rights reserved.
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*/
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// TODO: Run through the canvas array to find a canvas with the requested
// width / height, so we don't need to resize it?
var CanvasProvider = {
canvases: [],
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getCanvas: function(width, height) {
var size = height === undefined ? width : Size.create(width, height);
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if (this.canvases.length) {
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var canvas = this.canvases.pop();
// If they are not the same size, we don't need to clear them
// using clearRect and visa versa.
if ((canvas.width != size.width)
|| (canvas.height != size.height)) {
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canvas.width = size.width;
canvas.height = size.height;
} else {
// +1 is needed on some browsers to really clear the borders
canvas.getContext('2d').clearRect(0, 0,
size.width + 1, size.height + 1);
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}
return canvas;
} else {
/*#*/ if (options.browser) {
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var canvas = document.createElement('canvas');
canvas.width = size.width;
canvas.height = size.height;
return canvas;
/*#*/ } else { // !options.browser
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return new Canvas(size.width, size.height);
/*#*/ } // !options.browser
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}
},
getContext: function(width, height) {
return this.getCanvas(width, height).getContext('2d');
},
// release can receive either a canvas or a context.
release: function(obj) {
this.canvases.push(obj.canvas ? obj.canvas : obj);
},
};