[Bug 751484] compositor: refactor in order to have alpha sources blended over non alpha ones

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751484

Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |nicolas.dufresne at collabora.
                   |                            |co.uk

--- Comment #2 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
I agree we need this feature. I believe the compositor only implements
SRC_OVER, where having SRC_COPY is wanted. I think completing the existing (but
very limited) blit API would be the "ideal" way forward. I would be fine though
if we implement more dynamic blit operation due to time constraint. A first
step would be to collect the need, and what HW and API already do, and draft an
usable and dynamic API.

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