security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Performance increase when canvas bigger than maxSize.

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Fixes #93.
This commit is contained in:
kkapsner 2016-12-01 20:40:28 +01:00
parent af6fcd8026
commit 7b7583afe0
3 changed files with 13 additions and 3 deletions
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2
lib/intercept.js
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@ -56,7 +56,7 @@
setRandomSupplyByType(prefs("rng"));
var fake = changedFunction.fakeGenerator(prefs, function(messageId){
notify({url: window.location.href, errorStack: error.stack, messageId});
});
}, original);
switch (fake){
case true:
return original;

4
lib/modifiedAPI.js
View file

@ -187,13 +187,13 @@
return status;
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(prefs, notify){
fakeGenerator: function(prefs, notify, original){
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){
context = this;
return original.call(this, sx, sy, sw, sh);
}
else {
notify("fakedReadout");