Due to how the decoders work, they will write garbage data into
the padding, and later using the image for sampling with linear
images will use the garbage to create broken results. Let the
user specify the image size and align it up in the driver, so
sampling of the image later has the correct w/h.
cc: mesa-stable
Reviewed-by: Lynne <dev@lynne.ee>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23227>
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