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wayland: Drop support for linux dmabuf buffer flags

Vlad Zahorodnii requested to merge work/zzag/drop-linux-dmabuf-flags-support into master

A client can specify the following flags when creating a linux dmabuf client buffer:

  • y_invert
  • interlaced
  • bottom_first

Only the y_invert flag is supported by kwin. The interlaced and the bottom_first flags are ignored. On the other hand, most clients don't specify the dmabuf flags. For example, neither EGL nor Vulkan WSIs use the y_invert flag.

The y_invert flag is undesired because it also blocks optimizations such as direct scanout because DRM assumes that the origin is in the top left corner.

Therefore, this change drops the support for linux dmabuf flags. From the protocol perspective, this is fine. It can be viewed as buffer import failing with the specified flags.

Edited by Vlad Zahorodnii

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