Sure it lets you do fast 2d acceleration but we don't use 2d accel infrastructure anywhere anymore.
Subsurfaces have been in Wayland since the beginning of the protocol.
This is simply getting them to work on demand so we can do something X (or Xv) could never do since Drawables would get moved to new memory (that may not even be mappable on the CPU-side) on every frame.
And that's to actually use the scanout plane correctly to avoid powering up the 3d part of the GPU when doing video playback on composited systems.
Sure it lets you do fast 2d acceleration but we don't use 2d accel infrastructure anywhere anymore.
Subsurfaces have been in Wayland since the beginning of the protocol.
This is simply getting them to work on demand so we can do something X (or Xv) could never do since Drawables would get moved to new memory (that may not even be mappable on the CPU-side) on every frame.
And that's to actually use the scanout plane correctly to avoid powering up the 3d part of the GPU when doing video playback on composited systems.