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Discard the image as soon as possible.

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This commit is contained in:
Antoine Vandecreme 2015-11-05 22:16:20 -05:00
parent b85d0674e6
commit f58a525f47
1 changed files with 13 additions and 9 deletions
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22
src/imagetilesource.js
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@ -103,7 +103,7 @@
* @throws {Error} * @throws {Error}
*/ */
getImageInfo: function (url) { getImageInfo: function (url) {
var image = new Image(); var image = this.image = new Image();
var _this = this; var _this = this;
if (this.crossOriginPolicy) { if (this.crossOriginPolicy) {
@ -122,7 +122,7 @@
_this._tileHeight = _this.height; _this._tileHeight = _this.height;
_this.tileOverlap = 0; _this.tileOverlap = 0;
_this.minLevel = 0; _this.minLevel = 0;
_this.levels = _this._buildLevels(image); _this.levels = _this._buildLevels();
_this.maxLevel = _this.levels.length - 1; _this.maxLevel = _this.levels.length - 1;
_this.ready = true; _this.ready = true;
@ -226,30 +226,34 @@
* @private Build the differents levels of the pyramid if possible * @private Build the differents levels of the pyramid if possible
* (canvas API enabled and no canvas tainting issue) * (canvas API enabled and no canvas tainting issue)
*/ */
_buildLevels: function (image) { _buildLevels: function () {
var levels = [{ var levels = [{
url: image.src, url: this.image.src,
width: image.naturalWidth, width: this.image.naturalWidth,
height: image.naturalHeight height: this.image.naturalHeight
}]; }];
if (!this.buildPyramid || !$.supportsCanvas || !this.useCanvas) { if (!this.buildPyramid || !$.supportsCanvas || !this.useCanvas) {
// We don't need the image anymore. Allows it to be GC.
delete this.image;
return levels; return levels;
} }
var currentWidth = image.naturalWidth; var currentWidth = this.image.naturalWidth;
var currentHeight = image.naturalHeight; var currentHeight = this.image.naturalHeight;
var bigCanvas = document.createElement("canvas"); var bigCanvas = document.createElement("canvas");
var bigContext = bigCanvas.getContext("2d"); var bigContext = bigCanvas.getContext("2d");
bigCanvas.width = currentWidth; bigCanvas.width = currentWidth;
bigCanvas.height = currentHeight; bigCanvas.height = currentHeight;
bigContext.drawImage(image, 0, 0, currentWidth, currentHeight); bigContext.drawImage(this.image, 0, 0, currentWidth, currentHeight);
// We cache the context of the highest level because the browser // We cache the context of the highest level because the browser
// is a lot faster at downsampling something it already has // is a lot faster at downsampling something it already has
// downsampled before. // downsampled before.
levels[0].context2D = bigContext; levels[0].context2D = bigContext;
// We don't need the image anymore. Allows it to be GC.
delete this.image;
if ($.isCanvasTainted(bigCanvas)) { if ($.isCanvasTainted(bigCanvas)) {
// If the canvas is tainted, we can't compute the pyramid. // If the canvas is tainted, we can't compute the pyramid.