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protocol: wl_shm uses pre-multiplied alpha

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Add a note about pre-multiplied alpha for all wl_shm formats.
Include an escape hatch in the spec to allow other protocol
extensions to override this.

Signed-off-by: Simon Ser <contact@emersion.fr>
Closes: https://gitlab.freedesktop.org/wayland/wayland/-/issues/61
This commit is contained in:
Simon Ser 2021-10-31 12:10:08 +01:00
parent ca893075ef
commit ebfc70cdf7
1 changed files with 3 additions and 0 deletions
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protocol/wayland.xml
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@ -296,6 +296,9 @@
The drm format codes match the macros defined in drm_fourcc.h, except
argb8888 and xrgb8888. The formats actually supported by the compositor
will be reported by the format event.
For all wl_shm formats and unless specified in another protocol
extension, pre-multiplied alpha is used for pixel values.
</description>
<!-- Note to protocol writers: don't update this list manually, instead
run the automated script that keeps it in sync with drm_fourcc.h. -->