I think there's still some confusion. Why does the GPU need to handle more than one flavor of Y'CbCr? Why can't the jpeg/PNG/whatever decoder be relied on to c

I think there's still some confusion. Why does the GPU need to handle more than one flavor of Y'CbCr? Why can't the jpeg/PNG/whatever decoder be relied on to convert whatever flavor it uses to the Direct X/OpenGL flavors?