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Thomas Hellstrom authored
XA has been using L8_UNORM for a8 and yuv component surfaces. This commit instead makes XA prefer R8_UNORM since it's assumed to have a higher availability. Also neither of these formats are suitable as destination formats using destination alpha blending, so reject those operations. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com>
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