/*

* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.

* http://paperjs.org/

*

* Copyright (c) 2011 - 2013, Juerg Lehni & Jonathan Puckey

* http://lehni.org/ & http://jonathanpuckey.com/

*

* Distributed under the MIT license. See LICENSE file for details.

*

* All rights reserved.

*/

// 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: [],

getCanvas: function(width, height) {

var size = height === undefined ? width : new Size(width, height),

canvas,

init = true;

if (this.canvases.length) {

canvas = this.canvases.pop();

} else {

/*#*/ if (options.environment == 'browser') {

canvas = document.createElement('canvas');

/*#*/ } else { // !options.environment == 'browser'

canvas = new Canvas(size.width, size.height);

init = false; // It's already initialized through constructor.

/*#*/ } // !options.environment == 'browser'

}

var ctx = canvas.getContext('2d');

// We save on retrieval and restore on release.

ctx.save();

// 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) {

// +1 is needed on some browsers to really clear the borders

if (init)

ctx.clearRect(0, 0, size.width + 1, size.height + 1);

} else {

canvas.width = size.width;

canvas.height = size.height;

}

return canvas;

},

getContext: function(width, height) {

return this.getCanvas(width, height).getContext('2d');

},

// release can receive either a canvas or a context.

release: function(obj) {

var canvas = obj.canvas ? obj.canvas : obj;

// We restore contexts on release(), see getCanvas()

canvas.getContext('2d').restore();

this.canvases.push(canvas);

}

};