[PATCH wayland] protocol: Add logical_size event to wl_output
Olivier Fourdan
ofourdan at redhat.com
Fri Jun 30 08:55:55 UTC 2017
With the introduction of fractional scaling in some compositors and due
to existing discrepancies between compositors on the way Xwayland
surfaces are scaled based on the wl_output scale, Xwayland and possibly
other Wayland clients need a way to know the size of the outputs in the
global compositor space regardless of the advertised scaling factor.
https://bugs.freedesktop.org/show_bug.cgi?id=101436
Signed-off-by: Olivier Fourdan <ofourdan at redhat.com>
---
This is the follow-up on:
https://lists.freedesktop.org/archives/wayland-devel/2017-June/034384.html
protocol/wayland.xml | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 29b63be..524a2de 100644
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -2338,7 +2338,7 @@
</event>
</interface>
- <interface name="wl_output" version="3">
+ <interface name="wl_output" version="4">
<description summary="compositor output region">
An output describes part of the compositor geometry. The
compositor works in the 'compositor coordinate system' and an
@@ -2486,6 +2486,24 @@
use the output object anymore.
</description>
</request>
+
+ <!-- Version 4 additions -->
+
+ <event name="logical_size" since="4">
+ <description summary="Size of the output in the global compositor space">
+ The logical_size event describes the size of the output in the global
+ compositor space.
+
+ For example, a surface with the size matching the logical_size will
+ have the same size as the corresponding output when displayed.
+
+ Clients such as Xwayland need this to configure their surfaces in
+ the global compositor space as the compositor may apply a different
+ scale from what is advertised by the output scaling property (to
+ achieve fractional scaling for example).
+ </description>
+ </event>
+
</interface>
<interface name="wl_region" version="1">
--
2.9.4
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