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backend-drm: Abide by the weston-direct-display specification

Marius Vlad requested to merge mvlad/weston:wip/mvlad/direct-display-avoid-libgbm into main

Turns out it seems we have a missed some spots when using the weston-direct-display protocol.

Specifically we still seem to be attempting a dma buffer import which ultimately can reach the GPU. This patch rectifies that in such a way that we can actually provide a full scanout path for client's (dma) buffers as to avoid hitting the GPU entirely.

Signed-off-by: Marius Vlad marius.vlad@collabora.com

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