On 09/29/2012 01:28 AM, John Kåre Alsaker wrote:
Wayland also does scaling and rotations but the difference between linear
and srgb is much smaller for these. I think the real solution for this is to
allow clients to know the actual transform of their surfaces to the screen
and be allowed to draw the transformed image, since this will avoid
resampling and filtering, as well as letting the clients choose the color
space.
Part of the point of Wayland is that clients shouldn't know about how
they are placed or transformed, even if they did, the compositor would
still have to compose them and know about the gamma encoding they use.
Clients certainly should not *have* to know about the transformation,
and the shell will transform for them.
However, even thought there is a deliberate attempt to make clients not
know it in current Wayland, I think client awareness of the transform is
going to be needed eventually. Lots of clients could draw their
transformed windows enormously faster and higher quality than then if
they drew the non-transformed one and the shell then transformed the image.
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