<?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 must always 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 transferred 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>
