security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Added double readout test.

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This commit is contained in:
kkapsner 2017-07-18 23:53:24 +02:00
parent 45d5576eaf
commit cde3b90492
1 changed files with 28 additions and 1 deletions
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29
test/detectionTest.html
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@ -144,7 +144,6 @@ function testKnownPixelValue(size, log){
} }
} }
return false; return false;
} }
addTest("known pixel value test 1", function(log){ addTest("known pixel value test 1", function(log){
return testKnownPixelValue(1, log); return testKnownPixelValue(1, log);
@ -152,6 +151,34 @@ addTest("known pixel value test 1", function(log){
addTest("known pixel value test 10", function(log){ addTest("known pixel value test 10", function(log){
return testKnownPixelValue(10, log); return testKnownPixelValue(10, log);
}); });
addTest("double readout test", function(log){
var canvas = document.createElement("canvas");
var context = canvas.getContext("2d");
var imageData = context.getImageData(0, 0, canvas.width, canvas.height);
for (var i = 0; i < imageData.data.length; i += 1){
if (i % 4 !== 3){
imageData.data[i] = Math.floor(256 * Math.random());
}
else {
imageData.data[i] = 255;
}
}
context.putImageData(imageData, 0, 0);
var imageData1 = context.getImageData(0, 0, canvas.width, canvas.height);
var imageData2 = context.getImageData(0, 0, canvas.width, canvas.height);
for (var i = 0; i < imageData2.data.length; i += 1){
if (imageData1.data[i] !== imageData2.data[i]){
log("mismatch at", i, ":",
imageData1.data[i], "(", imageData1.data[i].toString(2), ")",
"!=",
imageData2.data[i], "(", imageData2.data[i].toString(2), ")",
"| original:", imageData.data[i], "(", imageData.data[i].toString(2), ")");
return true;
}
}
return false;
});
</script> </script>
</body> </body>
</html> </html>