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linux-dmabuf: Send format events for protocol version 3

Alexandros Frantzis requested to merge afrantzis/weston:linux-dmabuf-v3-format-events into main

The linux-dmabuf-unstable-v1 specification does not deprecate "format" events in version 3 of the protocol. Therefore the compositor must send both "format" and "modifier" events if version 3 is bound.

Side note: although keeping the "format" event in v3 where we have the more capable "modifier" event isn't really useful, it's what the spec says at this time. It's an artifact of the evolution of the protocol and the delay in clarifying support for DRM_FORMAT_MOD_INVALID in the "modifier" event.

Signed-off-by: Alexandros Frantzis alexandros.frantzis@collabora.com

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