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protocol: document that color channels provide electrical values

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Expand the work done in [1] to document that all channels store
electrical values. See the discussion in [2].

[1]: https://gitlab.freedesktop.org/wayland/wayland/-/merge_requests/316
[2]: https://gitlab.freedesktop.org/wayland/wayland/-/merge_requests/250#note_2311377

Signed-off-by: Simon Ser <contact@emersion.fr>
This commit is contained in:
Simon Ser 2024-03-06 11:19:09 +01:00
parent 44b1c0c737
commit aa2a6d560b
1 changed files with 4 additions and 2 deletions
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6
protocol/wayland.xml
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@ -479,8 +479,10 @@
client provides and updates the contents is defined by the buffer factory client provides and updates the contents is defined by the buffer factory
interface. interface.
If the buffer uses a format that has an alpha channel, the alpha channel Color channels are assumed to be electrical rather than optical (in other
is assumed to be premultiplied in the electrical color channel values words, encoded with a transfer function) unless otherwise specified. If
the buffer uses a format that has an alpha channel, the alpha channel is
assumed to be premultiplied into the electrical color channel values
(after transfer function encoding) unless otherwise specified. (after transfer function encoding) unless otherwise specified.
Note, because wl_buffer objects are created from multiple independent Note, because wl_buffer objects are created from multiple independent