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Merge branch 'jorth/buffer-interp' into 'main'

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protocol: move wl_buffer interpretation to wl_surface.attach

See merge request wayland/wayland!476
This commit is contained in:
Julian Orth 2025-09-22 11:49:52 +02:00
commit 8b0890fa96
1 changed files with 7 additions and 9 deletions
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16
protocol/wayland.xml
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@ -305,9 +305,6 @@
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. -->
@ -479,12 +476,6 @@
client provides and updates the contents is defined by the buffer factory
interface.
Color channels are assumed to be electrical rather than optical (in other
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.
Note, because wl_buffer objects are created from multiple independent
factory interfaces, the wl_buffer interface is frozen at version 1.
</description>
@ -1526,6 +1517,13 @@
maximise compatibility should not destroy pending buffers and should
ensure that they explicitly remove content from surfaces, even after
destroying buffers.
Unless specified otherwise by a protocol extension, the compositor
assumes that the values stored in the wl_buffer use pre-multiplied
alpha, are pre-multiplied in electrical values, use an
implementation-defined color space, and use an implementation-defined
transfer function. These color spaces and transfer functions are usually
sRGB, but this depends on the compositor.
</description>
<arg name="buffer" type="object" interface="wl_buffer" allow-null="true"
summary="buffer of surface contents"/>