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Fixes behaviour of DOMCanvasFactory to return {canvas, context}.

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This commit is contained in:
Mukul Mishra 2017-02-07 02:49:56 +05:30
parent 3e5c6e4287
commit 41d092d04b
2 changed files with 23 additions and 18 deletions
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24
src/display/dom_utils.js
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@ -39,24 +39,30 @@ DOMCanvasFactory.prototype = {
create: function DOMCanvasFactory_create(width, height) {
assert(width > 0 && height > 0, 'invalid canvas size');
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
canvas.width = width;
canvas.height = height;
return canvas;
return {
canvas: canvas,
context: context,
};
},
reset: function DOMCanvasFactory_reset(canvas, width, height) {
assert(canvas, 'canvas is not specified');
reset: function DOMCanvasFactory_reset(canvasAndContextPair, width, height) {
assert(canvasAndContextPair.canvas, 'canvas is not specified');
assert(width > 0 && height > 0, 'invalid canvas size');
canvas.width = width;
canvas.height = height;
canvasAndContextPair.canvas.width = width;
canvasAndContextPair.canvas.height = height;
},
destroy: function DOMCanvasFactory_destroy(canvas) {
assert(canvas, 'canvas is not specified');
destroy: function DOMCanvasFactory_destroy(canvasAndContextPair) {
assert(canvasAndContextPair.canvas, 'canvas is not specified');
// Zeroing the width and height cause Firefox to release graphics
// resources immediately, which can greatly reduce memory consumption.
canvas.width = 0;
canvas.height = 0;
canvasAndContextPair.canvas.width = 0;
canvasAndContextPair.canvas.height = 0;
canvasAndContextPair.canvas = null;
canvasAndContextPair.context = null;
}
};