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protocol: mention that buffers with alpha are assumed premultiplied

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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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Matt Hoosier 2021-09-29 09:41:34 -05:00
parent 616b4ae618
commit c6c1bbe4ab
1 changed files with 4 additions and 0 deletions
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protocol/wayland.xml
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@ -436,6 +436,10 @@
a height and can be attached to a wl_surface, but the mechanism by which a
client provides and updates the contents is defined by the buffer factory
interface.
If the buffer uses a format that has an alpha channel, the alpha channel
is assumed to be premultiplied in the color channels unless otherwise
specified.
</description>
<request name="destroy" type="destructor">