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protocol: mention that buffers with alpha are assumed premultiplied

Matt Hoosier requested to merge wl-buffer-premult-doc into main

This turns out to be the default assumption by compositors, OpenGL, and the DRM framework. Let's say it explicitly to avoid misinterpretation.

See https://lists.freedesktop.org/archives/wayland-devel/2021-September/041990.html.

Signed-off-by: Matt Hoosier matt.hoosier@garmin.com

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