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backends/drm: upload custom geometry instead of using glScissor for optimized rendering

Xaver Hugl requested to merge work/zamundaaa/better-damage-rendering into master

Empirical data suggests this yields a decent reduction in GPU usage - on my laptop when moving a blurred konsole around fast with a complex ICC profile set, I get

  • about 80% GPU usage on master without damage tracking
  • about 70-75% GPU usage on master with damage tracking
  • about 50-60% GPU usage with this + damage tracking enabled

It would be good if someone else could verify that this helps on their system as well.

CCBUG: 477223

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