Only copy non-writeable image when CPU upscaling #2860
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Copying takes time and memory. Why waste this time and memory if we are just going to immediately copy the image to the GPU?
Now the copy will only happen if the user is upscaling with CPU. On anything else, the image is simply moved to a tensor (sharing the same memory) after being made writeable, then copied to the GPU. The image is then set back to readonly.
This made a significant cut to processing time.