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Add mapImage and unmapImage functions to DRIimage extension for mapping and unmapping DRIimages for CPU access. The caller provides the region of the image to map and is returned a pointer to the beginning of the region and the stride (which could be different from the original). Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net>
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