security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Fixed broken webGl faking.

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Fixes #136
This commit is contained in:
kkapsner 2017-10-10 21:09:26 +02:00
parent db3b8fdd69
commit c5872ef5a1
1 changed files with 8 additions and 4 deletions
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12
lib/modifiedAPI.js
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@ -31,8 +31,8 @@
var imageData; var imageData;
var source; var source;
if ((context.canvas.width || 0) * (context.canvas.height || 0) === 0){ if ((context.canvas.width || 0) * (context.canvas.height || 0) === 0){
imageData = new getWrapped(window).ImageData(0, 0); imageData = new (getWrapped(window).ImageData)(0, 0);
source = new getWrapped(window).ImageData(0, 0); source = new (getWrapped(window).ImageData)(0, 0);
} }
else if (context instanceof window.CanvasRenderingContext2D){ else if (context instanceof window.CanvasRenderingContext2D){
imageData = window.CanvasRenderingContext2D.prototype.getImageData.call( imageData = window.CanvasRenderingContext2D.prototype.getImageData.call(
@ -43,9 +43,13 @@
source = imageData.data; source = imageData.data;
} }
else { else {
imageData = new getWrapped(window).ImageData(context.canvas.width, context.canvas.height); imageData = new (getWrapped(window).ImageData)(context.canvas.width, context.canvas.height);
source = new Uint8Array(imageData.data.length); source = new Uint8Array(imageData.data.length);
window.WebGLRenderingContext.prototype.readPixels.call( (
context instanceof window.WebGLRenderingContext?
window.WebGLRenderingContext:
window.WebGL2RenderingContext
).prototype.readPixels.call(
context, context,
0, 0, context.canvas.width, context.canvas.height, 0, 0, context.canvas.width, context.canvas.height,
context.RGBA, context.UNSIGNED_BYTE, context.RGBA, context.UNSIGNED_BYTE,