security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Code Releases Activity

Improved performance for getImageData.

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This commit is contained in:
kkapsner 2016-12-03 17:29:30 +01:00
parent 7b7583afe0
commit 0eeaf84826
1 changed files with 3 additions and 10 deletions
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13
lib/modifiedAPI.js
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@ -191,24 +191,17 @@
var maxSize = prefs("maxFakeSize") || Number.POSITIVE_INFINITY;
return function getImageData(sx, sy, sw, sh){
var window = getWindow(this.canvas);
var context;
if (sw * sh > maxSize){
return original.call(this, sx, sy, sw, sh);
return original.apply(this, window.Array.from(arguments));
}
else {
notify("fakedReadout");
context = window.HTMLCanvasElement.prototype.getContext.call(
var context = window.HTMLCanvasElement.prototype.getContext.call(
getFakeCanvas(window, this.canvas),
"2d"
);
return original.apply(context, window.Array.from(arguments));
}
var data = window.CanvasRenderingContext2D.prototype.getImageData.apply(context, arguments).data;
var imageData = new window.wrappedJSObject.ImageData(sw, sh);
for (var i = 0, l = data.length; i < l; i += 1){
imageData.data[i] = data[i];
}
return imageData;
};
}
},