577c4711e1
Mutter already calculates and tracks the damage rectangles to redraw only areas of the screen that change since the last time a buffer was used. This patch extends this by using the EGL_KHR_partial_update extension to inform the GPU in advance that only those areas will be changed, which may allow for further optimization. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2023>