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backends/drm: more changes towards layered rendering

Xaver Hugl requested to merge work/output-layer-7 into master

Commit 1: make qpainter also use its own layer class

Commit 2: Introduce DrmDisplayDevice to unify code paths for lease outputs and normal outputs

Commit 3: Make the layers use DrmDisplayDevice instead of DrmAbstractOutput

Commit 4: Make DrmPipeline and DrmGpu take care of layers, instead of the render backends. This opens the way to have DrmGpu create layers for overlay planes as well as for tiled and cloned outputs later on

Commit 5: Commit 4 introduced a crash in the destructor of EglGbmLayer because it requires a context to be current, in order to destroy the shadow buffer. To fix this, the render backends now signal their destruction before it happens and the layers get replaced later on. This is not particularly pretty but can be improved later


Edited by Xaver Hugl

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