Add gamma control

unstable/wlr-gamma-control-unstable-v1.xml

@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="wlr_gamma_control_unstable_v1">
+  <copyright>
+    Copyright © 2015 Giulio camuffo
+    Copyright © 2018 Simon Ser
+
+    Permission to use, copy, modify, distribute, and sell this
+    software and its documentation for any purpose is hereby granted
+    without fee, provided that the above copyright notice appear in
+    all copies and that both that copyright notice and this permission
+    notice appear in supporting documentation, and that the name of
+    the copyright holders not be used in advertising or publicity
+    pertaining to distribution of the software without specific,
+    written prior permission.  The copyright holders make no
+    representations about the suitability of this software for any
+    purpose.  It is provided "as is" without express or implied
+    warranty.
+
+    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+    THIS SOFTWARE.
+  </copyright>
+
+  <description summary="manage gamma tables of outputs">
+    This protocol allows a privileged client to set the gamma tables for
+    outputs.
+
+    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.
+  </description>
+
+  <interface name="zwlr_gamma_control_manager_v1" version="1">
+    <description summary="manager to create per-output gamma controls">
+      This interface is a manager that allows creating per-output gamma
+      controls.
+    </description>
+
+    <request name="get_gamma_control">
+      <description summary="get a gamma control for an output">
+        Create a gamma control that can be used to adjust gamma tables for the
+        provided output.
+      </description>
+      <arg name="id" type="new_id" interface="zwlr_gamma_control_v1"/>
+      <arg name="output" type="object" interface="wl_output"/>
+    </request>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the manager">
+        All objects created by the manager will still remain valid, until their
+        appropriate destroy request has been called.
+      </description>
+    </request>
+  </interface>
+
+  <interface name="zwlr_gamma_control_v1" version="1">
+    <description summary="adjust gamma tables for an output">
+      This interface allows a client to adjust gamma tables for a particular
+      output.
+
+      The client will receive the gamma size, and will then be able to set gamma
+      tables. At any time the compositor can send a failed event indicating that
+      this object is no longer valid.
+
+      There can only be at most one gamma control object per output, which
+      has exclusive access to this particular output. When the gamma control
+      object is destroyed, the gamma table is restored to its original value.
+    </description>
+
+    <event name="gamma_size">
+      <description summary="size of gamma ramps">
+        Advertise the size of each gamma ramp.
+
+        This event is sent immediately when the gamma control object is created.
+      </description>
+      <arg name="size" type="uint" summary="number of elements in a ramp"/>
+    </event>
+
+    <enum name="error">
+      <entry name="invalid_gamma" value="1" summary="invalid gamma tables"/>
+    </enum>
+
+    <request name="set_gamma">
+      <description summary="set the gamma table">
+        Set the gamma table. The file descriptor can be memory-mapped to provide
+        the raw gamma table, which contains successive gamma ramps for the red,
+        green and blue channels. Each gamma ramp is an array of 16-byte unsigned
+        integers which has the same length as the gamma size.
+
+        The file descriptor data must have the same length as three times the
+        gamma size.
+      </description>
+      <arg name="fd" type="fd" summary="gamma table file descriptor"/>
+    </request>
+
+    <event name="failed">
+      <description summary="object no longer valid">
+        This event indicates that the gamma control is no longer valid. This
+        can happen for a number of reasons, including:
+        - The output doesn't support gamma tables
+        - Setting the gamma tables failed
+        - Another client already has exclusive gamma control for this output
+        - The compositor has transfered gamma control to another client
+
+        Upon receiving this event, the client should destroy this object.
+      </description>
+    </event>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy this control">
+        Destroys the gamma control object. If the object is still valid, this
+        restores the original gamma tables.
+      </description>
+    </request>
+  </interface>
+</protocol>