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glamor_composite_choose_shader() may upload our scratch pixmaps to get a Render operation completed. We don't want to hang onto GL memory for our scratch pixmaps, since we'll just have to reallocate them at a new w/h next time around, and the contents will be updated as well. Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Eric Anholt <eric@anholt.net>
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