wlseeds/protocol/wlr-screencopy-unstable-v1.xml

<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wlr_screencopy_unstable_v1">
  <copyright>
    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
    Software.

    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.
  </copyright>

  <description summary="screen content capturing on client buffers">
    This protocol allows clients to ask the compositor to copy part of the
    screen content to a client buffer.
  </description>

  <interface name="zwlr_screencopy_manager_v1" version="1">
    <description summary="manager to inform clients and begin capturing">
      This object is a manager which offers requests to start capturing from a
      source.
    </description>

    <request name="capture_output">
      <description summary="start capturing">
        Request to start capturing from the given output.
      </description>
      <arg name="frame" type="new_id" interface="zwlr_screencopy_frame_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_screencopy_frame_v1" version="1">
    <description summary="a frame ready for copy">
      This object represents a frame which is ready to have its resources
      fetched and used.
    </description>

    <enum name="flags" bitfield="true">
      <entry name="y_invert" value="1" summary="contents are y-inverted"/>
    </enum>

    <event name="buffer">
      <description summary="buffer information">
        Provides information about the frame's buffer. This event is sent once
        as soon as the frame is created.

        The client should then create a buffer with the provided width and
        height, and send a copy request. It can optionally create a buffer with
        the preferred format and stride.
      </description>
      <arg name="width" type="uint" summary="buffer width"/>
      <arg name="height" type="uint" summary="buffer height"/>
      <arg name="flags" type="uint" enum="flags" summary="buffer flags"/>
      <arg name="format" type="uint" summary="preferred DRM_FORMAT"/>
      <arg name="stride" type="uint" summary="preferred stride"/>
    </event>

    <request name="copy">
      <description summary="copy the frame">
        Copy the frame to the supplied buffer. The buffer must have a the
        correct size, see zwlr_screencopy_frame_v1.buffer. The buffer needs to
        have a supported format.

        If the frame is successfully copied, a ready event is sent. Otherwise,
        an abort event is sent.
      </description>
      <arg name="buffer" type="object" interface="wl_buffer"/>
    </request>

    <enum name="error">
      <entry name="already_used" value="0"
        summary="the object has already been used to copy a wl_buffer"/>
      <entry name="invalid_format" value="1" summary="format not supported"/>
      <entry name="invalid_dimensions" value="2"
        summary="invalid width or height"/>
    </enum>

    <event name="ready">
      <description summary="indicates frame is available for reading">
        Called as soon as the frame is copied, indicating it is available
        for reading.

        Upon receiving this event, the client should destroy the object.
      </description>
    </event>

    <event name="failed">
      <description summary="frame copy failed">
        This event indicates that the attempted frame copy has failed.

        Upon receiving this event, the client should destroy the object.
      </description>
    </event>

    <request name="destroy" type="destructor">
      <description summary="delete this object, used or not">
        Destroys the frame.
      </description>
    </request>
  </interface>
</protocol>