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When the preferred path META_SHARED_FRAMEBUFFER_COPY_MODE_SECONDARY_GPU cannot be used, as is the case for e.g. DisplayLink devices which do not actually have a GPU, try to use the primary GPU for the copying before falling back to read-pixels which is a CPU copy. When the primary GPU copy works, it should be a significant performance win over the CPU copy by avoiding stalling libmutter for the duration. This also renames META_SHARED_FRAMEBUFFER_COPY_MODE_* because the new names are more accurate. While the secondary GPU copy is always a GPU copy, the primary copy might be either a CPU or a GPU copy. https://gitlab.gnome.org/GNOME/mutter/merge_requests/615