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

Fixed bug with webgl-canvas.

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This commit is contained in:
kkapsner 2015-09-10 01:35:49 +02:00
parent 0904d8e2a6
commit 0640008459
2 changed files with 17 additions and 2 deletions
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canvasblocker.xpi
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19
lib/modifiedAPI.js
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@ -7,11 +7,26 @@
function getFakeCanvas(window, original){ function getFakeCanvas(window, original){
var context = window.HTMLCanvasElement.prototype.getContext.call(original, "2d"); var context = window.HTMLCanvasElement.prototype.getContext.call(original, "2d");
var imageData = window.CanvasRenderingContext2D.prototype.getImageData.call(context, 0, 0, original.width, original.height); var imageData, data, source;
if (context){
imageData = window.CanvasRenderingContext2D.prototype.getImageData.call(context, 0, 0, original.width, original.height);
source = imageData.data;
}
else {
context = window.HTMLCanvasElement.prototype.getContext.call(original, "webgl");
imageData = new window.wrappedJSObject.ImageData(original.width, original.height);
source = new window.wrappedJSObject.Uint8Array(imageData.data.length);
window.WebGLRenderingContext.prototype.readPixels.call(
context,
0, 0, original.width, original.height,
context.RGBA, context.UNSIGNED_BYTE,
source
);
}
var data = imageData.data; var data = imageData.data;
for (var i = 0, l = data.length; i < l; i += 1){ for (var i = 0, l = data.length; i < l; i += 1){
var value = data[i]; var value = source[i];
if (value >= 0x80){ if (value >= 0x80){
value = value ^ Math.floor(Math.random() * 0x20); value = value ^ Math.floor(Math.random() * 0x20);
} }