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protocol: when buffer transform and scale change

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Clarify when the pending and current buffer transform and scale values
change, and what exactly happens on commit.

This matches what Weston currently does.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Pekka Paalanen 2014-02-07 11:13:01 +02:00 • committed by Kristian Høgsberg
parent b9eebce0aa
commit f8b37449b2
1 changed files with 9 additions and 0 deletions
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9
protocol/wayland.xml
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@ -1201,6 +1201,11 @@
A newly created surface has its buffer transformation set to normal.
wl_surface.set_buffer_transform changes the pending buffer
transformation. wl_surface.commit copies the pending buffer
transformation to the current one. Otherwise, the pending and current
values are never changed.
The purpose of this request is to allow clients to render content
according to the output transform, thus permiting the compositor to
use certain optimizations even if the display is rotated. Using
@ -1227,6 +1232,10 @@
A newly created surface has its buffer scale set to 1.
wl_surface.set_buffer_scale changes the pending buffer scale.
wl_surface.commit copies the pending buffer scale to the current one.
Otherwise, the pending and current values are never changed.
The purpose of this request is to allow clients to supply higher
resolution buffer data for use on high resolution outputs. Its
intended that you pick the same buffer scale as the scale of the