Bug 222101

HTMLCanvasElement::copiedImage() contains old image with GPU Process on LayoutTests/fast/canvas/webgl/canvas-2d-webgl-texture.html appears to fail because HTMLCanvasElement::copiedImage() returns a new Image that contains old data. The test is roughly as follows: ctx.fillStyle = "rgb(200, 0, 0)"; ctx.fillRect(0, 0, 256, 256); gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas2d); // Calls HTMLCanvasElement::copiedImage() ctx.fillStyle = "rgb(0, 0, 200)"; ctx.fillRect(0, 0, 256, 256); gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas2d); // Calls HTMLCanvasElement::copiedImage() It appears that while the second copiedImage should contain the blue contents, it still contains the red contents. The copy is done with: RefPtr<NativeImage> ImageBufferCGBitmapBackend::copyNativeImage(BackingStoreCopy copyBehavior) const { switch (copyBehavior) { case CopyBackingStore: return NativeImage::create(adoptCF(CGBitmapContextCreateImage(context().platformContext())));