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screencating: query for dmabuf availability before we start streaming

Aleix Pol Gonzalez requested to merge work/screencast-dmabuf-24bit into master

As things are right now, we can only do 32bit textures for dmabuf (see gbm_bo_format in gbm.h). This means that we were lying to our receivers when we had 24bit textures by then giving a 32bit texture instead.

This changes it so we request a dummy texture before starting and if we are offered one we assume they're available and offer a 32bits stream directly (i.e. BGRA).

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