security-and-privacy/CanvasBlocker
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Made readPixels consistent with the other faked readout functions.

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This commit is contained in:
kkapsner 2017-08-13 23:41:57 +02:00
parent bdbdf1d04a
commit d8f6fb1ac9
3 changed files with 128 additions and 27 deletions
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33
lib/modifiedAPI.js
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@ -15,6 +15,8 @@
}
const colorStatistics = require("./colorStatistics");
const logging = require("./logging");
const {copyCanvasToWebgl} = require("./webgl");
// let Cu = require("chrome").Cu;
@ -101,6 +103,7 @@
return canvas;
}
catch (e){
logging.warning("Error while faking:", e);
return original;
}
}
@ -363,34 +366,10 @@
fakeGenerator: function(prefs, notify, window, original){
return function readPixels(x, y, width, height, format, type, pixels){
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
// not able to use the getFakeCanvas function because the context type is wrong...
notify.call(this, "fakedReadout");
var xPixels = pixels;
var ret = original.apply(this, window.Array.from(arguments));
var l = xPixels.length;
var ignoredColors = {};
if (prefs("ignoreFrequentColors")){
var statistic = colorStatistics.compute(pixels);
ignoredColors = statistic.getMaxColors(prefs("ignoreFrequentColors"));
}
var rng = randomSupply.getPixelRng(l, window, ignoredColors);
var fakeAlphaChannel = prefs("fakeAlphaChannel");
for (var i = 0; i < l; i += 4){
var [r, g, b, a] = rng(
xPixels[i + 0],
xPixels[i + 1],
xPixels[i + 2],
xPixels[i + 3],
i / 4
);
xPixels[i + 0] = r;
xPixels[i + 1] = g;
xPixels[i + 2] = b;
if (fakeAlphaChannel){
xPixels[i + 3] = a;
}
}
return ret;
var fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
var {context} = copyCanvasToWebgl(window, fakeCanvas, this instanceof window.WebGLRenderingContext? "webgl": "webgl2");
return original.apply(context, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(arguments));