[PATCH wayland-protocols v5] unstable: add xdg-decoration protocol
contact at emersion.fr
Wed Apr 18 18:48:46 UTC 2018
This adds a new protocol to negotiate server-side rendering of window
decorations for xdg-toplevels. This allows compositors that want to draw
decorations themselves to send their preference to clients, and clients that
prefer server-side decorations to request them.
This is inspired by a protocol from KDE  which has been implemented in
KDE and Sway and was submitted for consideration in 2017 . This patch
provides an updated protocol with those concerns taken into account.
Signed-off-by: Simon Ser <contact at emersion.fr>
Reviewed-by: Drew DeVault <sir at cmpwn.com>
Reviewed-by: David Edmundson <david at davidedmundson.co.uk>
Reviewed-by: Alan Griffiths <alan.griffiths at canonical.com>
Reviewed-by: Tony Crisci <tony at dubstepdish.com>
Reviewed-by: Eike Hein <hein at kde.org>
This was iterated on privately between representatives of Sway and wlroots
(Simon Ser, Drew DeVault and Tony Crisci), KDE and Qt (David Edmundson), and
Mir (Alan Griffiths).
A proof-of-concept of a client and server implementation is available at .
Changes from v4 to v5:
- Renamed the protocol to xdg-decoration for future extensions (Jonas)
- Removed the preferred_mode event and the set_mode request for now because
of a race (Jonas)
Makefile.am | 1 +
unstable/xdg-decoration/README | 4 +
.../xdg-decoration-unstable-v1.xml | 115 ++++++++++++++++++
3 files changed, 120 insertions(+)
create mode 100644 unstable/xdg-decoration/README
create mode 100644 unstable/xdg-decoration/xdg-decoration-unstable-v1.xml
diff --git a/Makefile.am b/Makefile.am
index 4b9a901..71909d8 100644
@@ -17,6 +17,7 @@ unstable_protocols = \
+ unstable/xdg-decoration/xdg-decoration-unstable-v1.xml \
stable_protocols = \
diff --git a/unstable/xdg-decoration/README b/unstable/xdg-decoration/README
new file mode 100644
@@ -0,0 +1,4 @@
+Simon Ser <contact at emersion.fr>
diff --git a/unstable/xdg-decoration/xdg-decoration-unstable-v1.xml b/unstable/xdg-decoration/xdg-decoration-unstable-v1.xml
new file mode 100644
@@ -0,0 +1,115 @@
+<?xml version="1.0" encoding="UTF-8"?>
+ Copyright © 2018 Simon Ser
+ Permission is hereby granted, free of charge, to any person obtaining a
+ copy of this software and associated documentation files (the "Software"),
+ to deal in the Software without restriction, including without limitation
+ the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ and/or sell copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following conditions:
+ The above copyright notice and this permission notice (including the next
+ paragraph) shall be included in all copies or substantial portions of the
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.
+ <interface name="zxdg_decoration_manager_v1" version="1">
+ <description summary="window decoration manager">
+ This interface allows a compositor to announce support for server-side
+ decorations and optionally express a preference for using them.
+ A window decoration is a set of window controls as deemed appropriate by
+ the party managing them, such as user interface components used to move,
+ resize and change a window's state.
+ A client can use this protocol to request being decorated by a supporting
+ If compositor and client do not negotiate the use of a server-side
+ decoration using this protocol, clients continue to self-decorate as they
+ see fit.
+ Warning! The protocol described in this file is experimental and
+ backward incompatible changes may be made. Backward compatible changes
+ may be added together with the corresponding interface version bump.
+ Backward incompatible changes are done by bumping the version number in
+ the protocol and interface names and resetting the interface version.
+ Once the protocol is to be declared stable, the 'z' prefix and the
+ version number in the protocol and interface names are removed and the
+ interface version number is reset.
+ <enum name="error">
+ <entry name="unconfigured_buffer" value="1"/>
+ <entry name="already_constructed" value="2"/>
+ <request name="destroy" type="destructor">
+ <description summary="destroy the decoration manager object">
+ Destroy the decoration manager.
+ <request name="get_toplevel_decoration">
+ <description summary="create a new toplevel decoration object">
+ Create a new decoration object associated with the given toplevel.
+ Creating an xdg_toplevel_decoration from an xdg_toplevel which has a
+ buffer attached or committed is a client error, and any attempts by a
+ client to attach or manipulate a buffer prior to the first
+ xdg_toplevel_decoration.configure call must also be treated as
+ <arg name="id" type="new_id" interface="zxdg_toplevel_decoration_v1"/>
+ <arg name="toplevel" type="object" interface="xdg_toplevel"/>
+ <interface name="zxdg_toplevel_decoration_v1" version="1">
+ <description summary="decoration object for a toplevel surface">
+ The decoration object allows the compositor to toggle server-side window
+ decorations for a toplevel surface. The client can request to switch to
+ another mode.
+ The xdg_toplevel_decoration object must be destroyed before its
+ <request name="destroy" type="destructor">
+ <description summary="destroy the decoration object">
+ Switch back to a mode without any server-side decorations at the next
+ <enum name="mode">
+ <description summary="window decoration modes">
+ These values describe window decoration modes.
+ <entry name="client_side" value="1" summary="no server-side window decoration"/>
+ <entry name="server_side" value="2" summary="server-side window decoration"/>
+ <event name="configure">
+ <description summary="suggest a surface change">
+ The configure event asks the client to change its decoration mode. The
+ configured state should not be applied immediately. See
+ xdg_surface.configure for details.
+ A configure event can be sent at any time. The specified mode must be
+ obeyed by the client.
+ <arg name="mode" type="uint" enum="mode" summary="the decoration mode"/>
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