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

Added setting for canvas cache.

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This commit is contained in:
kkapsner 2017-08-08 18:08:18 +02:00
parent f853071d19
commit 48dc965f7c
6 changed files with 41 additions and 1 deletions
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11
lib/modifiedAPI.js
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@ -54,8 +54,16 @@
};
}
var canvasCache = Object.create(null);
function getFakeCanvas(window, original, prefs){
try {
if (prefs("useCanvasCache")){
var originalDataURL = original.toDataURL();
var cached = canvasCache[originalDataURL];
if (cached){
return cached;
}
}
// original may not be a canvas -> we must not leak an error
var context = getContext(window, original);
var {imageData, source} = getImageData(window, context);
@ -86,6 +94,9 @@
var canvas = original.cloneNode(true);
context = window.HTMLCanvasElement.prototype.getContext.call(canvas, "2d");
context.putImageData(imageData, 0, 0);
if (prefs("useCanvasCache")){
canvasCache[originalDataURL] = canvas;
}
return canvas;
}
catch (e){