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This makes it work properly with OpenGL based desktop compositing, as tested with EGL and GLX based compositing under OpenGL-2/3, and also artifact free with XRender based 2D compositing. Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Antoine Martin <antoine@nagafix.co.uk>
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