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Color management architecture: color profiles

Merged Pekka Paalanen requested to merge pq/weston:mr/color-output into main
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    Instead of checking just the monotonicity of the blending results, this
    changes the alpha-blending test to compute the reference blend result
    itself and then comparing to the compositor result. This way we can be
    sure that the compositor implements the exact correct formula and not
    something that just looks nice, as verifying the reference images are
    actually correct is hard.
    
    The reference image is renamed to follow the fact that this is not
    primarily a monotonicity test anymore. The reference image is also
    redundant, but I think it has documentary value.
    
    The #if 0'd block of code was very useful in figuring out blending
    errors in a future test case, so it is included here. I have a feeling
    we are going to need it again.
    
    Signed-off-by: default avatarPekka Paalanen <pekka.paalanen@collabora.com>
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