<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wayland">

  <copyright>
    Copyright © 2008-2011 Kristian Høgsberg
    Copyright © 2010-2011 Intel Corporation
    Copyright © 2012-2013 Collabora, Ltd.

    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>

  <interface name="wl_display" version="1">
    <description summary="core global object">
      The core global object.  This is a special singleton object.  It
      is used for internal Wayland protocol features.
    </description>

    <request name="sync">
      <description summary="asynchronous roundtrip">
        The sync request asks the server to emit the 'done' event
        on the returned wl_callback object.  Since requests are
        handled in-order and events are delivered in-order, this can
        be used as a barrier to ensure all previous requests and the
        resulting events have been handled.

        The object returned by this request will be destroyed by the
        compositor after the callback is fired and as such the client must not
        attempt to use it after that point.

        The callback_data passed in the callback is undefined and should be ignored.
      </description>
      <arg name="callback" type="new_id" interface="wl_callback"
           summary="callback object for the sync request"/>
    </request>

    <request name="get_registry">
      <description summary="get global registry object">
        This request creates a registry object that allows the client
        to list and bind the global objects available from the
        compositor.

        It should be noted that the server side resources consumed in
        response to a get_registry request can only be released when the
        client disconnects, not when the client side proxy is destroyed.
        Therefore, clients should invoke get_registry as infrequently as
        possible to avoid wasting memory.
      </description>
      <arg name="registry" type="new_id" interface="wl_registry"
           summary="global registry object"/>
    </request>

    <event name="error">
      <description summary="fatal error event">
        The error event is sent out when a fatal (non-recoverable)
        error has occurred.  The object_id argument is the object
        where the error occurred, most often in response to a request
        to that object.  The code identifies the error and is defined
        by the object interface.  As such, each interface defines its
        own set of error codes.  The message is a brief description
        of the error, for (debugging) convenience.
      </description>
      <arg name="object_id" type="object" summary="object where the error occurred"/>
      <arg name="code" type="uint" summary="error code"/>
      <arg name="message" type="string" summary="error description"/>
    </event>

    <enum name="error">
      <description summary="global error values">
        These errors are global and can be emitted in response to any
        server request.
      </description>
      <entry name="invalid_object" value="0"
             summary="server couldn't find object"/>
      <entry name="invalid_method" value="1"
             summary="method doesn't exist on the specified interface or malformed request"/>
      <entry name="no_memory" value="2"
             summary="server is out of memory"/>
      <entry name="implementation" value="3"
             summary="implementation error in compositor"/>
    </enum>

    <event name="delete_id">
      <description summary="acknowledge object ID deletion">
        This event is used internally by the object ID management logic.

        When the server stops using an object created by the client, the server
        sends this event. In particular, after sending this event, the server
        will no longer send any events that contain the object as the receiver
        or as an argument.

        When the client receives this event, it knows that it can reuse the
        object ID.
      </description>
      <arg name="id" type="uint" summary="deleted object ID"/>
    </event>
  </interface>

  <interface name="wl_registry" version="1">
    <description summary="global registry object">
      The singleton global registry object.  The server has a number of
      global objects that are available to all clients.  These objects
      typically represent an actual object in the server (for example,
      an input device) or they are singleton objects that provide
      extension functionality.

      When a client creates a registry object, the registry object
      will emit a global event for each global currently in the
      registry.  Globals come and go as a result of device or
      monitor hotplugs, reconfiguration or other events, and the
      registry will send out global and global_remove events to
      keep the client up to date with the changes.  To mark the end
      of the initial burst of events, the client can use the
      wl_display.sync request immediately after calling
      wl_display.get_registry.

      A client can bind to a global object by using the bind
      request.  This creates a client-side handle that lets the object
      emit events to the client and lets the client invoke requests on
      the object.
    </description>

    <request name="bind">
      <description summary="bind an object to the display">
        Binds a new, client-created object to the server using the
        specified name as the identifier.
      </description>
      <arg name="name" type="uint" summary="unique numeric name of the object"/>
      <arg name="id" type="new_id" summary="bound object"/>
    </request>

    <event name="global">
      <description summary="announce global object">
        Notify the client of global objects.

        The event notifies the client that a global object with
        the given name is now available, and it implements the
        given version of the given interface.
      </description>
      <arg name="name" type="uint" summary="numeric name of the global object"/>
      <arg name="interface" type="string" summary="interface implemented by the object"/>
      <arg name="version" type="uint" summary="interface version"/>
    </event>

    <event name="global_remove">
      <description summary="announce removal of global object">
        Notify the client of removed global objects.

        This event notifies the client that the global identified
        by name is no longer available.  If the client bound to
        the global using the bind request, the client should now
        destroy that object.

        The object remains valid and requests to the object will be
        ignored until the client destroys it, to avoid races between
        the global going away and a client sending a request to it.
      </description>
      <arg name="name" type="uint" summary="numeric name of the global object"/>
    </event>
  </interface>

  <interface name="wl_callback" version="1" frozen="true">
    <description summary="callback object">
      Clients can handle the 'done' event to get notified when
      the related request is done.

      Note, because wl_callback objects are created from multiple independent
      factory interfaces, the wl_callback interface is frozen at version 1.
    </description>

    <event name="done" type="destructor">
      <description summary="done event">
        Notify the client when the related request is done.
      </description>
      <arg name="callback_data" type="uint" summary="request-specific data for the callback"/>
    </event>
  </interface>

  <interface name="wl_compositor" version="7">
    <description summary="the compositor singleton">
      A compositor.  This object is a singleton global.  The
      compositor is in charge of combining the contents of multiple
      surfaces into one displayable output.
    </description>

    <request name="create_surface">
      <description summary="create new surface">
        Ask the compositor to create a new surface.
      </description>
      <arg name="id" type="new_id" interface="wl_surface" summary="the new surface"/>
    </request>

    <request name="create_region">
      <description summary="create new region">
        Ask the compositor to create a new region.
      </description>
      <arg name="id" type="new_id" interface="wl_region" summary="the new region"/>
    </request>

    <!-- Version 7 additions -->

    <request name="release" type="destructor" since="7">
      <description summary="destroy wl_compositor">
        This request destroys the wl_compositor. This has no effect on any other objects.
      </description>
    </request>
  </interface>

  <interface name="wl_shm_pool" version="3">
    <description summary="a shared memory pool">
      The wl_shm_pool object encapsulates a piece of memory shared
      between the compositor and client.  Through the wl_shm_pool
      object, the client can allocate shared memory wl_buffer objects.
      All objects created through the same pool share the same
      underlying mapped memory. Reusing the mapped memory avoids the
      setup/teardown overhead and is useful when interactively resizing
      a surface or for many small buffers.
    </description>

    <enum name="error" since="3">
      <description summary="wl_shm_pool error values">
        These errors can be emitted in response to wl_shm_pool requests.
      </description>
      <entry name="invalid_format" value="0" summary="buffer format is not known"/>
      <entry name="invalid_stride" value="1" summary="invalid size or stride during buffer creation"/>
    </enum>

    <request name="create_buffer">
      <description summary="create a buffer from the pool">
        Create a wl_buffer object from the pool.

        The buffer is created offset bytes into the pool and has
        width and height as specified.  The stride argument specifies
        the number of bytes from the beginning of one row to the beginning
        of the next.  The format is the pixel format of the buffer and
        must be one of those advertised through the wl_shm.format event.

        A buffer will keep a reference to the pool it was created from
        so it is valid to destroy the pool immediately after creating
        a buffer from it.
      </description>
      <arg name="id" type="new_id" interface="wl_buffer" summary="buffer to create"/>
      <arg name="offset" type="int" summary="buffer byte offset within the pool"/>
      <arg name="width" type="int" summary="buffer width, in pixels"/>
      <arg name="height" type="int" summary="buffer height, in pixels"/>
      <arg name="stride" type="int" summary="number of bytes from the beginning of one row to the beginning of the next row"/>
      <arg name="format" type="uint" enum="wl_shm.format" summary="buffer pixel format"/>
    </request>

    <request name="destroy" type="destructor">
      <description summary="destroy the pool">
        Destroy the shared memory pool.

        The mmapped memory will be released when all
        buffers that have been created from this pool
        are gone.
      </description>
    </request>

    <request name="resize">
      <description summary="change the size of the pool mapping">
        This request will cause the server to remap the backing memory
        for the pool from the file descriptor passed when the pool was
        created, but using the new size.  This request can only be
        used to make the pool bigger.

        This request only changes the amount of bytes that are mmapped
        by the server and does not touch the file corresponding to the
        file descriptor passed at creation time. It is the client's
        responsibility to ensure that the file is at least as big as
        the new pool size.
      </description>
      <arg name="size" type="int" summary="new size of the pool, in bytes"/>
    </request>
  </interface>

  <interface name="wl_shm" version="3">
    <description summary="shared memory support">
      A singleton global object that provides support for shared
      memory.

      Clients can create wl_shm_pool objects using the create_pool
      request.

      On binding the wl_shm object one or more format events
      are emitted to inform clients about the valid pixel formats
      that can be used for buffers.
    </description>

    <enum name="error" since="3">
      <description summary="wl_shm error values">
        These errors can be emitted in response to wl_shm requests.
      </description>
      <entry name="invalid_format" value="0" summary="buffer format is not known" deprecated-since="3"/>
      <entry name="invalid_stride" value="1" summary="invalid size or stride during pool creation"/>
      <entry name="invalid_fd" value="2" summary="mmapping the file descriptor failed"/>
    </enum>

    <enum name="format">
      <description summary="pixel formats">
        This describes the memory layout of an individual pixel.

        All renderers should support argb8888 and xrgb8888 but any other
        formats are optional and may not be supported by the particular
        renderer in use.

        The drm format codes match the macros defined in drm_fourcc.h, except
        argb8888 and xrgb8888. The formats actually supported by the compositor
        will be reported by the format event. See drm_fourcc.h for more detailed
        format descriptions.

        For all wl_shm formats and unless specified in another protocol
        extension, pre-multiplied alpha is used for pixel values.
      </description>
      <!-- Note to protocol writers: don't update this list manually, instead
           run the automated script that keeps it in sync with drm_fourcc.h. -->
      <entry name="argb8888" value="0" summary="32-bit ARGB format, [31:0] A:R:G:B 8:8:8:8 little endian"/>
      <entry name="xrgb8888" value="1" summary="32-bit RGB format, [31:0] x:R:G:B 8:8:8:8 little endian"/>
      <entry name="c8" value="0x20203843" summary="8-bit color index format, [7:0] C"/>
      <entry name="rgb332" value="0x38424752" summary="8-bit RGB format, [7:0] R:G:B 3:3:2"/>
      <entry name="bgr233" value="0x38524742" summary="8-bit BGR format, [7:0] B:G:R 2:3:3"/>
      <entry name="xrgb4444" value="0x32315258" summary="16-bit xRGB format, [15:0] x:R:G:B 4:4:4:4 little endian"/>
      <entry name="xbgr4444" value="0x32314258" summary="16-bit xBGR format, [15:0] x:B:G:R 4:4:4:4 little endian"/>
      <entry name="rgbx4444" value="0x32315852" summary="16-bit RGBx format, [15:0] R:G:B:x 4:4:4:4 little endian"/>
      <entry name="bgrx4444" value="0x32315842" summary="16-bit BGRx format, [15:0] B:G:R:x 4:4:4:4 little endian"/>
      <entry name="argb4444" value="0x32315241" summary="16-bit ARGB format, [15:0] A:R:G:B 4:4:4:4 little endian"/>
      <entry name="abgr4444" value="0x32314241" summary="16-bit ABGR format, [15:0] A:B:G:R 4:4:4:4 little endian"/>
      <entry name="rgba4444" value="0x32314152" summary="16-bit RGBA format, [15:0] R:G:B:A 4:4:4:4 little endian"/>
      <entry name="bgra4444" value="0x32314142" summary="16-bit BGRA format, [15:0] B:G:R:A 4:4:4:4 little endian"/>
      <entry name="xrgb1555" value="0x35315258" summary="16-bit xRGB format, [15:0] x:R:G:B 1:5:5:5 little endian"/>
      <entry name="xbgr1555" value="0x35314258" summary="16-bit xBGR 1555 format, [15:0] x:B:G:R 1:5:5:5 little endian"/>
      <entry name="rgbx5551" value="0x35315852" summary="16-bit RGBx 5551 format, [15:0] R:G:B:x 5:5:5:1 little endian"/>
      <entry name="bgrx5551" value="0x35315842" summary="16-bit BGRx 5551 format, [15:0] B:G:R:x 5:5:5:1 little endian"/>
      <entry name="argb1555" value="0x35315241" summary="16-bit ARGB 1555 format, [15:0] A:R:G:B 1:5:5:5 little endian"/>
      <entry name="abgr1555" value="0x35314241" summary="16-bit ABGR 1555 format, [15:0] A:B:G:R 1:5:5:5 little endian"/>
      <entry name="rgba5551" value="0x35314152" summary="16-bit RGBA 5551 format, [15:0] R:G:B:A 5:5:5:1 little endian"/>
      <entry name="bgra5551" value="0x35314142" summary="16-bit BGRA 5551 format, [15:0] B:G:R:A 5:5:5:1 little endian"/>
      <entry name="rgb565" value="0x36314752" summary="16-bit RGB 565 format, [15:0] R:G:B 5:6:5 little endian"/>
      <entry name="bgr565" value="0x36314742" summary="16-bit BGR 565 format, [15:0] B:G:R 5:6:5 little endian"/>
      <entry name="rgb888" value="0x34324752" summary="24-bit RGB format, [23:0] R:G:B little endian"/>
      <entry name="bgr888" value="0x34324742" summary="24-bit BGR format, [23:0] B:G:R little endian"/>
      <entry name="xbgr8888" value="0x34324258" summary="32-bit xBGR format, [31:0] x:B:G:R 8:8:8:8 little endian"/>
      <entry name="rgbx8888" value="0x34325852" summary="32-bit RGBx format, [31:0] R:G:B:x 8:8:8:8 little endian"/>
      <entry name="bgrx8888" value="0x34325842" summary="32-bit BGRx format, [31:0] B:G:R:x 8:8:8:8 little endian"/>
      <entry name="abgr8888" value="0x34324241" summary="32-bit ABGR format, [31:0] A:B:G:R 8:8:8:8 little endian"/>
      <entry name="rgba8888" value="0x34324152" summary="32-bit RGBA format, [31:0] R:G:B:A 8:8:8:8 little endian"/>
      <entry name="bgra8888" value="0x34324142" summary="32-bit BGRA format, [31:0] B:G:R:A 8:8:8:8 little endian"/>
      <entry name="xrgb2101010" value="0x30335258" summary="32-bit xRGB format, [31:0] x:R:G:B 2:10:10:10 little endian"/>
      <entry name="xbgr2101010" value="0x30334258" summary="32-bit xBGR format, [31:0] x:B:G:R 2:10:10:10 little endian"/>
      <entry name="rgbx1010102" value="0x30335852" summary="32-bit RGBx format, [31:0] R:G:B:x 10:10:10:2 little endian"/>
      <entry name="bgrx1010102" value="0x30335842" summary="32-bit BGRx format, [31:0] B:G:R:x 10:10:10:2 little endian"/>
      <entry name="argb2101010" value="0x30335241" summary="32-bit ARGB format, [31:0] A:R:G:B 2:10:10:10 little endian"/>
      <entry name="abgr2101010" value="0x30334241" summary="32-bit ABGR format, [31:0] A:B:G:R 2:10:10:10 little endian"/>
      <entry name="rgba1010102" value="0x30334152" summary="32-bit RGBA format, [31:0] R:G:B:A 10:10:10:2 little endian"/>
      <entry name="bgra1010102" value="0x30334142" summary="32-bit BGRA format, [31:0] B:G:R:A 10:10:10:2 little endian"/>
      <entry name="yuyv" value="0x56595559" summary="packed YCbCr format, [31:0] Cr0:Y1:Cb0:Y0 8:8:8:8 little endian"/>
      <entry name="yvyu" value="0x55595659" summary="packed YCbCr format, [31:0] Cb0:Y1:Cr0:Y0 8:8:8:8 little endian"/>
      <entry name="uyvy" value="0x59565955" summary="packed YCbCr format, [31:0] Y1:Cr0:Y0:Cb0 8:8:8:8 little endian"/>
      <entry name="vyuy" value="0x59555956" summary="packed YCbCr format, [31:0] Y1:Cb0:Y0:Cr0 8:8:8:8 little endian"/>
      <entry name="ayuv" value="0x56555941" summary="packed AYCbCr format, [31:0] A:Y:Cb:Cr 8:8:8:8 little endian"/>
      <entry name="nv12" value="0x3231564e" summary="2 plane YCbCr Cr:Cb format, 2x2 subsampled Cr:Cb plane"/>
      <entry name="nv21" value="0x3132564e" summary="2 plane YCbCr Cb:Cr format, 2x2 subsampled Cb:Cr plane"/>
      <entry name="nv16" value="0x3631564e" summary="2 plane YCbCr Cr:Cb format, 2x1 subsampled Cr:Cb plane"/>
      <entry name="nv61" value="0x3136564e" summary="2 plane YCbCr Cb:Cr format, 2x1 subsampled Cb:Cr plane"/>
      <entry name="yuv410" value="0x39565559" summary="3 plane YCbCr format, 4x4 subsampled Cb (1) and Cr (2) planes"/>
      <entry name="yvu410" value="0x39555659" summary="3 plane YCbCr format, 4x4 subsampled Cr (1) and Cb (2) planes"/>
      <entry name="yuv411" value="0x31315559" summary="3 plane YCbCr format, 4x1 subsampled Cb (1) and Cr (2) planes"/>
      <entry name="yvu411" value="0x31315659" summary="3 plane YCbCr format, 4x1 subsampled Cr (1) and Cb (2) planes"/>
      <entry name="yuv420" value="0x32315559" summary="3 plane YCbCr format, 2x2 subsampled Cb (1) and Cr (2) planes"/>
      <entry name="yvu420" value="0x32315659" summary="3 plane YCbCr format, 2x2 subsampled Cr (1) and Cb (2) planes"/>
      <entry name="yuv422" value="0x36315559" summary="3 plane YCbCr format, 2x1 subsampled Cb (1) and Cr (2) planes"/>
      <entry name="yvu422" value="0x36315659" summary="3 plane YCbCr format, 2x1 subsampled Cr (1) and Cb (2) planes"/>
      <entry name="yuv444" value="0x34325559" summary="3 plane YCbCr format, non-subsampled Cb (1) and Cr (2) planes"/>
      <entry name="yvu444" value="0x34325659" summary="3 plane YCbCr format, non-subsampled Cr (1) and Cb (2) planes"/>
      <entry name="r8" value="0x20203852" summary="[7:0] R"/>
      <entry name="r16" value="0x20363152" summary="[15:0] R little endian"/>
      <entry name="rg88" value="0x38384752" summary="[15:0] R:G 8:8 little endian"/>
      <entry name="gr88" value="0x38385247" summary="[15:0] G:R 8:8 little endian"/>
      <entry name="rg1616" value="0x32334752" summary="[31:0] R:G 16:16 little endian"/>
      <entry name="gr1616" value="0x32335247" summary="[31:0] G:R 16:16 little endian"/>
      <entry name="xrgb16161616f" value="0x48345258" summary="[63:0] x:R:G:B 16:16:16:16 little endian"/>
      <entry name="xbgr16161616f" value="0x48344258" summary="[63:0] x:B:G:R 16:16:16:16 little endian"/>
      <entry name="argb16161616f" value="0x48345241" summary="[63:0] A:R:G:B 16:16:16:16 little endian"/>
      <entry name="abgr16161616f" value="0x48344241" summary="[63:0] A:B:G:R 16:16:16:16 little endian"/>
      <entry name="xyuv8888" value="0x56555958" summary="[31:0] X:Y:Cb:Cr 8:8:8:8 little endian"/>
      <entry name="vuy888" value="0x34325556" summary="[23:0] Cr:Cb:Y 8:8:8 little endian"/>
      <entry name="vuy101010" value="0x30335556" summary="Y followed by U then V, 10:10:10. Non-linear modifier only"/>
      <entry name="y210" value="0x30313259" summary="[63:0] Cr0:0:Y1:0:Cb0:0:Y0:0 10:6:10:6:10:6:10:6 little endian per 2 Y pixels"/>
      <entry name="y212" value="0x32313259" summary="[63:0] Cr0:0:Y1:0:Cb0:0:Y0:0 12:4:12:4:12:4:12:4 little endian per 2 Y pixels"/>
      <entry name="y216" value="0x36313259" summary="[63:0] Cr0:Y1:Cb0:Y0 16:16:16:16 little endian per 2 Y pixels"/>
      <entry name="y410" value="0x30313459" summary="[31:0] A:Cr:Y:Cb 2:10:10:10 little endian"/>
      <entry name="y412" value="0x32313459" summary="[63:0] A:0:Cr:0:Y:0:Cb:0 12:4:12:4:12:4:12:4 little endian"/>
      <entry name="y416" value="0x36313459" summary="[63:0] A:Cr:Y:Cb 16:16:16:16 little endian"/>
      <entry name="xvyu2101010" value="0x30335658" summary="[31:0] X:Cr:Y:Cb 2:10:10:10 little endian"/>
      <entry name="xvyu12_16161616" value="0x36335658" summary="[63:0] X:0:Cr:0:Y:0:Cb:0 12:4:12:4:12:4:12:4 little endian"/>
      <entry name="xvyu16161616" value="0x38345658" summary="[63:0] X:Cr:Y:Cb 16:16:16:16 little endian"/>
      <entry name="y0l0" value="0x304c3059" summary="[63:0]   A3:A2:Y3:0:Cr0:0:Y2:0:A1:A0:Y1:0:Cb0:0:Y0:0  1:1:8:2:8:2:8:2:1:1:8:2:8:2:8:2 little endian"/>
      <entry name="x0l0" value="0x304c3058" summary="[63:0]   X3:X2:Y3:0:Cr0:0:Y2:0:X1:X0:Y1:0:Cb0:0:Y0:0  1:1:8:2:8:2:8:2:1:1:8:2:8:2:8:2 little endian"/>
      <entry name="y0l2" value="0x324c3059" summary="[63:0]   A3:A2:Y3:Cr0:Y2:A1:A0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"/>
      <entry name="x0l2" value="0x324c3058" summary="[63:0]   X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"/>
      <entry name="yuv420_8bit" value="0x38305559"/>
      <entry name="yuv420_10bit" value="0x30315559"/>
      <entry name="xrgb8888_a8" value="0x38415258"/>
      <entry name="xbgr8888_a8" value="0x38414258"/>
      <entry name="rgbx8888_a8" value="0x38415852"/>
      <entry name="bgrx8888_a8" value="0x38415842"/>
      <entry name="rgb888_a8" value="0x38413852"/>
      <entry name="bgr888_a8" value="0x38413842"/>
      <entry name="rgb565_a8" value="0x38413552"/>
      <entry name="bgr565_a8" value="0x38413542"/>
      <entry name="nv24" value="0x3432564e" summary="non-subsampled Cr:Cb plane"/>
      <entry name="nv42" value="0x3234564e" summary="non-subsampled Cb:Cr plane"/>
      <entry name="p210" value="0x30313250" summary="2x1 subsampled Cr:Cb plane, 10 bit per channel"/>
      <entry name="p010" value="0x30313050" summary="2x2 subsampled Cr:Cb plane 10 bits per channel"/>
      <entry name="p012" value="0x32313050" summary="2x2 subsampled Cr:Cb plane 12 bits per channel"/>
      <entry name="p016" value="0x36313050" summary="2x2 subsampled Cr:Cb plane 16 bits per channel"/>
      <entry name="axbxgxrx106106106106" value="0x30314241" summary="[63:0] A:x:B:x:G:x:R:x 10:6:10:6:10:6:10:6 little endian"/>
      <entry name="nv15" value="0x3531564e" summary="2x2 subsampled Cr:Cb plane"/>
      <entry name="q410" value="0x30313451"/>
      <entry name="q401" value="0x31303451"/>
      <entry name="xrgb16161616" value="0x38345258" summary="[63:0] x:R:G:B 16:16:16:16 little endian"/>
      <entry name="xbgr16161616" value="0x38344258" summary="[63:0] x:B:G:R 16:16:16:16 little endian"/>
      <entry name="argb16161616" value="0x38345241" summary="[63:0] A:R:G:B 16:16:16:16 little endian"/>
      <entry name="abgr16161616" value="0x38344241" summary="[63:0] A:B:G:R 16:16:16:16 little endian"/>
      <entry name="c1" value="0x20203143" summary="[7:0] C0:C1:C2:C3:C4:C5:C6:C7 1:1:1:1:1:1:1:1 eight pixels/byte"/>
      <entry name="c2" value="0x20203243" summary="[7:0] C0:C1:C2:C3 2:2:2:2 four pixels/byte"/>
      <entry name="c4" value="0x20203443" summary="[7:0] C0:C1 4:4 two pixels/byte"/>
      <entry name="d1" value="0x20203144" summary="[7:0] D0:D1:D2:D3:D4:D5:D6:D7 1:1:1:1:1:1:1:1 eight pixels/byte"/>
      <entry name="d2" value="0x20203244" summary="[7:0] D0:D1:D2:D3 2:2:2:2 four pixels/byte"/>
      <entry name="d4" value="0x20203444" summary="[7:0] D0:D1 4:4 two pixels/byte"/>
      <entry name="d8" value="0x20203844" summary="[7:0] D"/>
      <entry name="r1" value="0x20203152" summary="[7:0] R0:R1:R2:R3:R4:R5:R6:R7 1:1:1:1:1:1:1:1 eight pixels/byte"/>
      <entry name="r2" value="0x20203252" summary="[7:0] R0:R1:R2:R3 2:2:2:2 four pixels/byte"/>
      <entry name="r4" value="0x20203452" summary="[7:0] R0:R1 4:4 two pixels/byte"/>
      <entry name="r10" value="0x20303152" summary="[15:0] x:R 6:10 little endian"/>
      <entry name="r12" value="0x20323152" summary="[15:0] x:R 4:12 little endian"/>
      <entry name="avuy8888" value="0x59555641" summary="[31:0] A:Cr:Cb:Y 8:8:8:8 little endian"/>
      <entry name="xvuy8888" value="0x59555658" summary="[31:0] X:Cr:Cb:Y 8:8:8:8 little endian"/>
      <entry name="p030" value="0x30333050" summary="2x2 subsampled Cr:Cb plane 10 bits per channel packed"/>
      <entry name="rgb161616" value="0x38344752" summary="[47:0] R:G:B 16:16:16 little endian"/>
      <entry name="bgr161616" value="0x38344742" summary="[47:0] B:G:R 16:16:16 little endian"/>
      <entry name="r16f" value="0x48202052" summary="[15:0] R 16 little endian"/>
      <entry name="gr1616f" value="0x48205247" summary="[31:0] G:R 16:16 little endian"/>
      <entry name="bgr161616f" value="0x48524742" summary="[47:0] B:G:R 16:16:16 little endian"/>
      <entry name="r32f" value="0x46202052" summary="[31:0] R 32 little endian"/>
      <entry name="gr3232f" value="0x46205247" summary="[63:0] G:R 32:32 little endian"/>
      <entry name="bgr323232f" value="0x46524742" summary="[95:0] B:G:R 32:32:32 little endian"/>
      <entry name="abgr32323232f" value="0x46384241" summary="[127:0] A:B:G:R 32:32:32:32 little endian"/>
      <entry name="nv20" value="0x3032564e" summary="2x1 subsampled Cr:Cb plane"/>
      <entry name="nv30" value="0x3033564e" summary="non-subsampled Cr:Cb plane"/>
      <entry name="s010" value="0x30313053" summary="2x2 subsampled Cb (1) and Cr (2) planes 10 bits per channel"/>
      <entry name="s210" value="0x30313253" summary="2x1 subsampled Cb (1) and Cr (2) planes 10 bits per channel"/>
      <entry name="s410" value="0x30313453" summary="non-subsampled Cb (1) and Cr (2) planes 10 bits per channel"/>
      <entry name="s012" value="0x32313053" summary="2x2 subsampled Cb (1) and Cr (2) planes 12 bits per channel"/>
      <entry name="s212" value="0x32313253" summary="2x1 subsampled Cb (1) and Cr (2) planes 12 bits per channel"/>
      <entry name="s412" value="0x32313453" summary="non-subsampled Cb (1) and Cr (2) planes 12 bits per channel"/>
      <entry name="s016" value="0x36313053" summary="2x2 subsampled Cb (1) and Cr (2) planes 16 bits per channel"/>
      <entry name="s216" value="0x36313253" summary="2x1 subsampled Cb (1) and Cr (2) planes 16 bits per channel"/>
      <entry name="s416" value="0x36313453" summary="non-subsampled Cb (1) and Cr (2) planes 16 bits per channel"/>
      <entry name="xvuy2101010" value="0x30335958" summary="[31:0] x:Cr:Cb:Y 2:10:10:10 little endian"/>
      <entry name="p230" value="0x30333250" summary="2x1 subsampled Cr:Cb plane 10 bits per channel packed"/>
      <entry name="t430" value="0x30333454"/>
      <entry name="y8" value="0x59455247" summary="8-bit Y-only"/>
      <entry name="xyyy2101010" value="0x34415059" summary="[31:0] x:Y2:Y1:Y0 2:10:10:10 little endian"/>
    </enum>

    <request name="create_pool">
      <description summary="create a shm pool">
        Create a new wl_shm_pool object.

        The pool can be used to create shared memory based buffer
        objects.  The server will mmap size bytes of the passed file
        descriptor, to use as backing memory for the pool.
      </description>
      <arg name="id" type="new_id" interface="wl_shm_pool" summary="pool to create"/>
      <arg name="fd" type="fd" summary="file descriptor for the pool"/>
      <arg name="size" type="int" summary="pool size, in bytes"/>
    </request>

    <event name="format">
      <description summary="pixel format description">
        Informs the client about a valid pixel format that
        can be used for buffers. Known formats include
        argb8888 and xrgb8888.

        Extensions to drm_fourcc.h (or the format enum) do not require
        increasing the wl_shm version; as a result, clients may receive format
        codes which were not in the list at the time the client was made.
      </description>
      <arg name="format" type="uint" enum="format" summary="buffer pixel format"/>
    </event>

    <!-- Version 2 additions -->

    <request name="release" type="destructor" since="2">
      <description summary="release the shm object">
        Using this request a client can tell the server that it is not going to
        use the shm object anymore.

        Objects created via this interface remain unaffected.
      </description>
    </request>
  </interface>

  <interface name="wl_buffer" version="1" frozen="true">
    <description summary="content for a wl_surface">
      A buffer provides the content for a wl_surface. Buffers are
      created through factory interfaces such as wl_shm, wp_linux_buffer_params
      (from the linux-dmabuf protocol extension) or similar. It has a width and
      a height and can be attached to a wl_surface, but the mechanism by which a
      client provides and updates the contents is defined by the buffer factory
      interface.

      Color channels are assumed to be electrical rather than optical (in other
      words, encoded with a transfer function) unless otherwise specified. If
      the buffer uses a format that has an alpha channel, the alpha channel is
      assumed to be premultiplied into the electrical color channel values
      (after transfer function encoding) unless otherwise specified.

      Note, because wl_buffer objects are created from multiple independent
      factory interfaces, the wl_buffer interface is frozen at version 1.
    </description>

    <request name="destroy" type="destructor">
      <description summary="destroy a buffer">
        Destroy a buffer. If and how you need to release the backing
        storage is defined by the buffer factory interface.

        For possible side-effects to a surface, see wl_surface.attach.
      </description>
    </request>

    <event name="release">
      <description summary="compositor releases buffer">
        Sent when this wl_buffer is no longer used by the compositor.

        For more information on when release events may or may not be sent,
        and what consequences it has, please see the description of
        wl_surface.attach.

        If a client receives a release event before the frame callback
        requested in the same wl_surface.commit that attaches this
        wl_buffer to a surface, then the client is immediately free to
        reuse the buffer and its backing storage, and does not need a
        second buffer for the next surface content update. Typically
        this is possible, when the compositor maintains a copy of the
        wl_surface contents, e.g. as a GL texture. This is an important
        optimization for GL(ES) compositors with wl_shm clients.
      </description>
    </event>
  </interface>

  <interface name="wl_data_offer" version="4">
    <description summary="offer to transfer data">
      A wl_data_offer represents a piece of data offered for transfer
      by another client (the source client).  It is used by the
      copy-and-paste and drag-and-drop mechanisms.  The offer
      describes the different mime types that the data can be
      converted to and provides the mechanism for transferring the
      data directly from the source client.
    </description>

    <enum name="error">
      <entry name="invalid_finish" value="0"
             summary="finish request was called untimely"/>
      <entry name="invalid_action_mask" value="1"
             summary="action mask contains invalid values"/>
      <entry name="invalid_action" value="2"
             summary="action argument has an invalid value"/>
      <entry name="invalid_offer" value="3"
             summary="offer doesn't accept this request"/>
    </enum>

    <request name="accept">
      <description summary="accept one of the offered mime types">
        Indicate that the client can accept the given mime type, or
        NULL for not accepted.

        For objects of version 2 or older, this request is used by the
        client to give feedback whether the client can receive the given
        mime type, or NULL if none is accepted; the feedback does not
        determine whether the drag-and-drop operation succeeds or not.

        For objects of version 3 or newer, this request determines the
        final result of the drag-and-drop operation. If the end result
        is that no mime types were accepted, the drag-and-drop operation
        will be cancelled and the corresponding drag source will receive
        wl_data_source.cancelled. Clients may still use this event in
        conjunction with wl_data_source.action for feedback.
      </description>
      <arg name="serial" type="uint" summary="serial number of the accept request"/>
      <arg name="mime_type" type="string" allow-null="true" summary="mime type accepted by the client"/>
    </request>

    <request name="receive">
      <description summary="request that the data is transferred">
        To transfer the offered data, the client issues this request
        and indicates the mime type it wants to receive.  The transfer
        happens through the passed file descriptor (typically created
        with the pipe system call).  The source client writes the data
        in the mime type representation requested and then closes the
        file descriptor.

        The receiving client reads from the read end of the pipe until
        EOF and then closes its end, at which point the transfer is
        complete.

        This request may happen multiple times for different mime types,
        both before and after wl_data_device.drop. Drag-and-drop destination
        clients may preemptively fetch data or examine it more closely to
        determine acceptance.
      </description>
      <arg name="mime_type" type="string" summary="mime type desired by receiver"/>
      <arg name="fd" type="fd" summary="file descriptor for data transfer"/>
    </request>

    <request name="destroy" type="destructor">
      <description summary="destroy data offer">
        Destroy the data offer.
      </description>
    </request>

    <event name="offer">
      <description summary="advertise offered mime type">
        Sent immediately after creating the wl_data_offer object.  One
        event per offered mime type.
      </description>
      <arg name="mime_type" type="string" summary="offered mime type"/>
    </event>

    <!-- Version 3 additions -->

    <request name="finish" since="3">
      <description summary="the offer will no longer be used">
        Notifies the compositor that the drag destination successfully
        finished the drag-and-drop operation.

        Upon receiving this request, the compositor will emit
        wl_data_source.dnd_finished on the drag source client.

        It is a client error to perform other requests than
        wl_data_offer.destroy after this one. It is also an error to perform
        this request after a NULL mime type has been set in
        wl_data_offer.accept or no action was received through
        wl_data_offer.action.

        If wl_data_offer.finish request is received for a non drag and drop
        operation, the invalid_finish protocol error is raised.
      </description>
    </request>

    <request name="set_actions" since="3">
      <description summary="set the available/preferred drag-and-drop actions">
        Sets the actions that the destination side client supports for
        this operation. This request may trigger the emission of
        wl_data_source.action and wl_data_offer.action events if the compositor
        needs to change the selected action.

        This request can be called multiple times throughout the
        drag-and-drop operation, typically in response to wl_data_device.enter
        or wl_data_device.motion events.

        This request determines the final result of the drag-and-drop
        operation. If the end result is that no action is accepted,
        the drag source will receive wl_data_source.cancelled.

        The dnd_actions argument must contain only values expressed in the
        wl_data_device_manager.dnd_actions enum, and the preferred_action
        argument must only contain one of those values set, otherwise it
        will result in a protocol error.

        While managing an "ask" action, the destination drag-and-drop client
        may perform further wl_data_offer.receive requests, and is expected
        to perform one last wl_data_offer.set_actions request with a preferred
        action other than "ask" (and optionally wl_data_offer.accept) before
        requesting wl_data_offer.finish, in order to convey the action selected
        by the user. If the preferred action is not in the
        wl_data_offer.source_actions mask, an error will be raised.

        If the "ask" action is dismissed (e.g. user cancellation), the client
        is expected to perform wl_data_offer.destroy right away.

        This request can only be made on drag-and-drop offers, a protocol error
        will be raised otherwise.
      </description>
      <arg name="dnd_actions" type="uint" summary="actions supported by the destination client"
           enum="wl_data_device_manager.dnd_action"/>
      <arg name="preferred_action" type="uint" summary="action preferred by the destination client"
           enum="wl_data_device_manager.dnd_action"/>
    </request>

    <event name="source_actions" since="3">
      <description summary="notify the source-side available actions">
        This event indicates the actions offered by the data source. It
        will be sent immediately after creating the wl_data_offer object,
        or anytime the source side changes its offered actions through
        wl_data_source.set_actions.
      </description>
      <arg name="source_actions" type="uint" summary="actions offered by the data source"
           enum="wl_data_device_manager.dnd_action"/>
    </event>

    <event name="action" since="3">
      <description summary="notify the selected action">
        This event indicates the action selected by the compositor after
        matching the source/destination side actions. Only one action (or
        none) will be offered here.

        This event can be emitted multiple times during the drag-and-drop
        operation in response to destination side action changes through
        wl_data_offer.set_actions.

        This event will no longer be emitted after wl_data_device.drop
        happened on the drag-and-drop destination, the client must
        honor the last action received, or the last preferred one set
        through wl_data_offer.set_actions when handling an "ask" action.

        Compositors may also change the selected action on the fly, mainly
        in response to keyboard modifier changes during the drag-and-drop
        operation.

        The most recent action received is always the valid one. Prior to
        receiving wl_data_device.drop, the chosen action may change (e.g.
        due to keyboard modifiers being pressed). At the time of receiving
        wl_data_device.drop the drag-and-drop destination must honor the
        last action received.

        Action changes may still happen after wl_data_device.drop,
        especially on "ask" actions, where the drag-and-drop destination
        may choose another action afterwards. Action changes happening
        at this stage are always the result of inter-client negotiation, the
        compositor shall no longer be able to induce a different action.

        Upon "ask" actions, it is expected that the drag-and-drop destination
        may potentially choose a different action and/or mime type,
        based on wl_data_offer.source_actions and finally chosen by the
        user (e.g. popping up a menu with the available options). The
        final wl_data_offer.set_actions and wl_data_offer.accept requests
        must happen before the call to wl_data_offer.finish.
      </description>
      <arg name="dnd_action" type="uint" summary="action selected by the compositor"
           enum="wl_data_device_manager.dnd_action"/>
    </event>
  </interface>

  <interface name="wl_data_source" version="4">
    <description summary="offer to transfer data">
      The wl_data_source object is the source side of a wl_data_offer.
      It is created by the source client in a data transfer and
      provides a way to describe the offered data and a way to respond
      to requests to transfer the data.
    </description>

    <enum name="error">
      <entry name="invalid_action_mask" value="0"
             summary="action mask contains invalid values"/>
      <entry name="invalid_source" value="1"
             summary="source doesn't accept this request"/>
    </enum>

    <request name="offer">
      <description summary="add an offered mime type">
        This request adds a mime type to the set of mime types
        advertised to targets.  Can be called several times to offer
        multiple types.
      </description>
      <arg name="mime_type" type="string" summary="mime type offered by the data source"/>
    </request>

    <request name="destroy" type="destructor">
      <description summary="destroy the data source">
        Destroy the data source.
      </description>
    </request>

    <event name="target">
      <description summary="a target accepts an offered mime type">
        Sent when a target accepts pointer_focus or motion events.  If
        a target does not accept any of the offered types, type is NULL.

        Used for feedback during drag-and-drop.
      </description>
      <arg name="mime_type" type="string" allow-null="true" summary="mime type accepted by the target"/>
    </event>

    <event name="send">
      <description summary="send the data">
        Request for data from the client.  Send the data as the
        specified mime type over the passed file descriptor, then
        close it.
      </description>
      <arg name="mime_type" type="string" summary="mime type for the data"/>
      <arg name="fd" type="fd" summary="file descriptor for the data"/>
    </event>

    <event name="cancelled">
      <description summary="selection was cancelled">
        This data source is no longer valid. There are several reasons why
        this could happen:

        - The data source has been replaced by another data source.
        - The drag-and-drop operation was performed, but the drop destination
          did not accept any of the mime types offered through
          wl_data_source.target.
        - The drag-and-drop operation was performed, but the drop destination
          did not select any of the actions present in the mask offered through
          wl_data_source.action.
        - The drag-and-drop operation was performed but didn't happen over a
          surface.
        - The compositor cancelled the drag-and-drop operation (e.g. compositor
          dependent timeouts to avoid stale drag-and-drop transfers).

        The client should clean up and destroy this data source.

        For objects of version 2 or older, wl_data_source.cancelled will
        only be emitted if the data source was replaced by another data
        source.
      </description>
    </event>

    <!-- Version 3 additions -->

    <request name="set_actions" since="3">
      <description summary="set the available drag-and-drop actions">
        Sets the actions that the source side client supports for this
        operation. This request may trigger wl_data_source.action and
        wl_data_offer.action events if the compositor needs to change the
        selected action.

        The dnd_actions argument must contain only values expressed in the
        wl_data_device_manager.dnd_actions enum, otherwise it will result
        in a protocol error.

        This request must be made once only, and can only be made on sources
        used in drag-and-drop, so it must be performed before
        wl_data_device.start_drag. Attempting to use the source other than
        for drag-and-drop will raise a protocol error.
      </description>
      <arg name="dnd_actions" type="uint" summary="actions supported by the data source"
           enum="wl_data_device_manager.dnd_action"/>
    </request>

    <event name="dnd_drop_performed" since="3">
      <description summary="the drag-and-drop operation physically finished">
        The user performed the drop action. This event does not indicate
        acceptance, wl_data_source.cancelled may still be emitted afterwards
        if the drop destination does not accept any mime type.

        However, this event might not be received if the compositor cancelled
        the drag-and-drop operation before this event could happen.

        Note that the data_source may still be used in the future and should
        not be destroyed here.
      </description>
    </event>

    <event name="dnd_finished" since="3">
      <description summary="the drag-and-drop operation concluded">
        The drop destination finished interoperating with this data
        source, so the client is now free to destroy this data source and
        free all associated data.

        If the action used to perform the operation was "move", the
        source can now delete the transferred data.
      </description>
    </event>

    <event name="action" since="3">
      <description summary="notify the selected action">
        This event indicates the action selected by the compositor after
        matching the source/destination side actions. Only one action (or
        none) will be offered here.

        This event can be emitted multiple times during the drag-and-drop
        operation, mainly in response to destination side changes through
        wl_data_offer.set_actions, and as the data device enters/leaves
        surfaces.

        It is only possible to receive this event after
        wl_data_source.dnd_drop_performed if the drag-and-drop operation
        ended in an "ask" action, in which case the final wl_data_source.action
        event will happen immediately before wl_data_source.dnd_finished.

        Compositors may also change the selected action on the fly, mainly
        in response to keyboard modifier changes during the drag-and-drop
        operation.

        The most recent action received is always the valid one. The chosen
        action may change alongside negotiation (e.g. an "ask" action can turn
        into a "move" operation), so the effects of the final action must
        always be applied in wl_data_source.dnd_finished.

        Clients can trigger cursor surface changes from this point, so
        they reflect the current action.
      </description>
      <arg name="dnd_action" type="uint" summary="action selected by the compositor"
           enum="wl_data_device_manager.dnd_action"/>
    </event>
  </interface>

  <interface name="wl_data_device" version="4">
    <description summary="data transfer device">
      There is one wl_data_device per seat which can be obtained
      from the global wl_data_device_manager singleton.

      A wl_data_device provides access to inter-client data transfer
      mechanisms such as copy-and-paste and drag-and-drop.
    </description>

    <enum name="error">
      <entry name="role" value="0" summary="given wl_surface has another role"/>
      <entry name="used_source" value="1" summary="source has already been used"/>
    </enum>

    <request name="start_drag">
      <description summary="start drag-and-drop operation">
        This request asks the compositor to start a drag-and-drop
        operation on behalf of the client.

        The source argument is the data source that provides the data
        for the eventual data transfer. If source is NULL, enter, leave
        and motion events are sent only to the client that initiated the
        drag and the client is expected to handle the data passing
        internally. If source is destroyed, the drag-and-drop session will be
        cancelled.

        The origin surface is the surface where the drag originates and
        the client must have an active implicit grab that matches the
        serial.

        The icon surface is an optional (can be NULL) surface that
        provides an icon to be moved around with the cursor.  Initially,
        the top-left corner of the icon surface is placed at the cursor
        hotspot, but subsequent wl_surface.offset requests can move the
        relative position. Attach requests must be confirmed with
        wl_surface.commit as usual. The icon surface is given the role of
        a drag-and-drop icon. If the icon surface already has another role,
        it raises a protocol error.

        The input region is ignored for wl_surfaces with the role of a
        drag-and-drop icon.

        The given source may not be used in any further set_selection or
        start_drag requests. Attempting to reuse a previously-used source
        may send a used_source error.
      </description>
      <arg name="source" type="object" interface="wl_data_source" allow-null="true" summary="data source for the eventual transfer"/>
      <arg name="origin" type="object" interface="wl_surface" summary="surface where the drag originates"/>
      <arg name="icon" type="object" interface="wl_surface" allow-null="true" summary="drag-and-drop icon surface"/>
      <arg name="serial" type="uint" summary="serial number of the implicit grab on the origin"/>
    </request>

    <request name="set_selection">
      <description summary="copy data to the selection">
        This request asks the compositor to set the selection
        to the data from the source on behalf of the client.

        To unset the selection, set the source to NULL.

        The given source may not be used in any further set_selection or
        start_drag requests. Attempting to reuse a previously-used source
        may send a used_source error.
      </description>
      <arg name="source" type="object" interface="wl_data_source" allow-null="true" summary="data source for the selection"/>
      <arg name="serial" type="uint" summary="serial number of the event that triggered this request"/>
    </request>

    <event name="data_offer">
      <description summary="introduce a new wl_data_offer">
        The data_offer event introduces a new wl_data_offer object,
        which will subsequently be used in either the
        data_device.enter event (for drag-and-drop) or the
        data_device.selection event (for selections).  Immediately
        following the data_device.data_offer event, the new data_offer
        object will send out data_offer.offer events to describe the
        mime types it offers.
      </description>
      <arg name="id" type="new_id" interface="wl_data_offer" summary="the new data_offer object"/>
    </event>

    <event name="enter">
      <description summary="initiate drag-and-drop session">
        This event is sent when an active drag-and-drop pointer enters
        a surface owned by the client.  The position of the pointer at
        enter time is provided by the x and y arguments, in surface-local
        coordinates.
      </description>
      <arg name="serial" type="uint" summary="serial number of the enter event"/>
      <arg name="surface" type="object" interface="wl_surface" summary="client surface entered"/>
      <arg name="x" type="fixed" summary="surface-local x coordinate"/>
      <arg name="y" type="fixed" summary="surface-local y coordinate"/>
      <arg name="id" type="object" interface="wl_data_offer" allow-null="true"
           summary="source data_offer object"/>
    </event>

    <event name="leave">
      <description summary="end drag-and-drop session">
        This event is sent when the drag-and-drop pointer leaves the
        surface and the session ends.  The client must destroy the
        wl_data_offer introduced at enter time at this point.
      </description>
    </event>

    <event name="motion">
      <description summary="drag-and-drop session motion">
        This event is sent when the drag-and-drop pointer moves within
        the currently focused surface. The new position of the pointer
        is provided by the x and y arguments, in surface-local
        coordinates.
      </description>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="x" type="fixed" summary="surface-local x coordinate"/>
      <arg name="y" type="fixed" summary="surface-local y coordinate"/>
    </event>

    <event name="drop">
      <description summary="end drag-and-drop session successfully">
        The event is sent when a drag-and-drop operation is ended
        because the implicit grab is removed.

        The drag-and-drop destination is expected to honor the last action
        received through wl_data_offer.action, if the resulting action is
        "copy" or "move", the destination can still perform
        wl_data_offer.receive requests, and is expected to end all
        transfers with a wl_data_offer.finish request.

        If the resulting action is "ask", the action will not be considered
        final. The drag-and-drop destination is expected to perform one last
        wl_data_offer.set_actions request, or wl_data_offer.destroy in order
        to cancel the operation.
      </description>
    </event>

    <event name="selection">
      <description summary="advertise new selection">
        The selection event is sent out to notify the client of a new
        wl_data_offer for the selection for this device.  The
        data_device.data_offer and the data_offer.offer events are
        sent out immediately before this event to introduce the data
        offer object.  The selection event is sent to a client
        immediately before receiving keyboard focus and when a new
        selection is set while the client has keyboard focus.  The
        data_offer is valid until a new data_offer or NULL is received
        or until the client loses keyboard focus.  Switching surface with
        keyboard focus within the same client doesn't mean a new selection
        will be sent.  The client must destroy the previous selection
        data_offer, if any, upon receiving this event.
      </description>
      <arg name="id" type="object" interface="wl_data_offer" allow-null="true"
           summary="selection data_offer object"/>
    </event>

    <!-- Version 2 additions -->

    <request name="release" type="destructor" since="2">
      <description summary="destroy data device">
        This request destroys the data device.
      </description>
    </request>
  </interface>

  <interface name="wl_data_device_manager" version="4">
    <description summary="data transfer interface">
      The wl_data_device_manager is a singleton global object that
      provides access to inter-client data transfer mechanisms such as
      copy-and-paste and drag-and-drop.  These mechanisms are tied to
      a wl_seat and this interface lets a client get a wl_data_device
      corresponding to a wl_seat.

      Depending on the version bound, the objects created from the bound
      wl_data_device_manager object will have different requirements for
      functioning properly. See wl_data_source.set_actions,
      wl_data_offer.accept and wl_data_offer.finish for details.
    </description>

    <request name="create_data_source">
      <description summary="create a new data source">
        Create a new data source.
      </description>
      <arg name="id" type="new_id" interface="wl_data_source" summary="data source to create"/>
    </request>

    <request name="get_data_device">
      <description summary="create a new data device">
        Create a new data device for a given seat.
      </description>
      <arg name="id" type="new_id" interface="wl_data_device" summary="data device to create"/>
      <arg name="seat" type="object" interface="wl_seat" summary="seat associated with the data device"/>
    </request>

    <!-- Version 3 additions -->

    <enum name="dnd_action" bitfield="true" since="3">
      <description summary="drag and drop actions">
        This is a bitmask of the available/preferred actions in a
        drag-and-drop operation.

        In the compositor, the selected action is a result of matching the
        actions offered by the source and destination sides.  "action" events
        with a "none" action will be sent to both source and destination if
        there is no match. All further checks will effectively happen on
        (source actions ∩ destination actions).

        In addition, compositors may also pick different actions in
        reaction to key modifiers being pressed. One common design that
        is used in major toolkits (and the behavior recommended for
        compositors) is:

        - If no modifiers are pressed, the first match (in bit order)
          will be used.
        - Pressing Shift selects "move", if enabled in the mask.
        - Pressing Control selects "copy", if enabled in the mask.

        Behavior beyond that is considered implementation-dependent.
        Compositors may for example bind other modifiers (like Alt/Meta)
        or drags initiated with other buttons than BTN_LEFT to specific
        actions (e.g. "ask").
      </description>
      <entry name="none" value="0" summary="no action"/>
      <entry name="copy" value="1" summary="copy action"/>
      <entry name="move" value="2" summary="move action"/>
      <entry name="ask" value="4" summary="ask action"/>
    </enum>

    <!-- Version 4 additions -->

    <request name="release" type="destructor" since="4">
      <description summary="destroy wl_data_device_manager">
        This request destroys the wl_data_device_manager. This has no effect on any other
        objects.
      </description>
    </request>
  </interface>

  <interface name="wl_shell" version="1">
    <description summary="create desktop-style surfaces">
      This interface is implemented by servers that provide
      desktop-style user interfaces.

      It allows clients to associate a wl_shell_surface with
      a basic surface.

      Note! This protocol is deprecated and not intended for production use.
      For desktop-style user interfaces, use xdg_shell. Compositors and clients
      should not implement this interface.
    </description>

    <enum name="error">
      <entry name="role" value="0" summary="given wl_surface has another role"/>
    </enum>

    <request name="get_shell_surface">
      <description summary="create a shell surface from a surface">
        Create a shell surface for an existing surface. This gives
        the wl_surface the role of a shell surface. If the wl_surface
        already has another role, it raises a protocol error.

        Only one shell surface can be associated with a given surface.
      </description>
      <arg name="id" type="new_id" interface="wl_shell_surface" summary="shell surface to create"/>
      <arg name="surface" type="object" interface="wl_surface" summary="surface to be given the shell surface role"/>
    </request>
  </interface>

  <interface name="wl_shell_surface" version="1">
    <description summary="desktop-style metadata interface">
      An interface that may be implemented by a wl_surface, for
      implementations that provide a desktop-style user interface.

      It provides requests to treat surfaces like toplevel, fullscreen
      or popup windows, move, resize or maximize them, associate
      metadata like title and class, etc.

      On the server side the object is automatically destroyed when
      the related wl_surface is destroyed. On the client side,
      wl_shell_surface_destroy() must be called before destroying
      the wl_surface object.
    </description>

    <request name="pong">
      <description summary="respond to a ping event">
        A client must respond to a ping event with a pong request or
        the client may be deemed unresponsive.
      </description>
      <arg name="serial" type="uint" summary="serial number of the ping event"/>
    </request>

    <request name="move">
      <description summary="start an interactive move">
        Start a pointer-driven move of the surface.

        This request must be used in response to a button press event.
        The server may ignore move requests depending on the state of
        the surface (e.g. fullscreen or maximized).
      </description>
      <arg name="seat" type="object" interface="wl_seat" summary="seat whose pointer is used"/>
      <arg name="serial" type="uint" summary="serial number of the implicit grab on the pointer"/>
    </request>

    <enum name="resize" bitfield="true">
      <description summary="edge values for resizing">
        These values are used to indicate which edge of a surface
        is being dragged in a resize operation. The server may
        use this information to adapt its behavior, e.g. choose
        an appropriate cursor image.
      </description>
      <entry name="none" value="0" summary="no edge"/>
      <entry name="top" value="1" summary="top edge"/>
      <entry name="bottom" value="2" summary="bottom edge"/>
      <entry name="left" value="4" summary="left edge"/>
      <entry name="top_left" value="5" summary="top and left edges"/>
      <entry name="bottom_left" value="6" summary="bottom and left edges"/>
      <entry name="right" value="8" summary="right edge"/>
      <entry name="top_right" value="9" summary="top and right edges"/>
      <entry name="bottom_right" value="10" summary="bottom and right edges"/>
    </enum>

    <request name="resize">
      <description summary="start an interactive resize">
        Start a pointer-driven resizing of the surface.

        This request must be used in response to a button press event.
        The server may ignore resize requests depending on the state of
        the surface (e.g. fullscreen or maximized).
      </description>
      <arg name="seat" type="object" interface="wl_seat" summary="seat whose pointer is used"/>
      <arg name="serial" type="uint" summary="serial number of the implicit grab on the pointer"/>
      <arg name="edges" type="uint" enum="resize" summary="which edge or corner is being dragged"/>
    </request>

    <request name="set_toplevel">
      <description summary="make the surface a toplevel surface">
        Map the surface as a toplevel surface.

        A toplevel surface is not fullscreen, maximized or transient.
      </description>
    </request>

    <enum name="transient" bitfield="true">
      <description summary="details of transient behaviour">
        These flags specify details of the expected behaviour
        of transient surfaces. Used in the set_transient request.
      </description>
      <entry name="inactive" value="0x1" summary="do not set keyboard focus"/>
    </enum>

    <request name="set_transient">
      <description summary="make the surface a transient surface">
        Map the surface relative to an existing surface.

        The x and y arguments specify the location of the upper left
        corner of the surface relative to the upper left corner of the
        parent surface, in surface-local coordinates.

        The flags argument controls details of the transient behaviour.
      </description>
      <arg name="parent" type="object" interface="wl_surface" summary="parent surface"/>
      <arg name="x" type="int" summary="surface-local x coordinate"/>
      <arg name="y" type="int" summary="surface-local y coordinate"/>
      <arg name="flags" type="uint" enum="transient" summary="transient surface behavior"/>
    </request>

    <enum name="fullscreen_method">
      <description summary="different method to set the surface fullscreen">
        Hints to indicate to the compositor how to deal with a conflict
        between the dimensions of the surface and the dimensions of the
        output. The compositor is free to ignore this parameter.
      </description>
      <entry name="default" value="0" summary="no preference, apply default policy"/>
      <entry name="scale" value="1" summary="scale, preserve the surface's aspect ratio and center on output"/>
      <entry name="driver" value="2" summary="switch output mode to the smallest mode that can fit the surface, add black borders to compensate size mismatch"/>
      <entry name="fill" value="3" summary="no upscaling, center on output and add black borders to compensate size mismatch"/>
    </enum>

    <request name="set_fullscreen">
      <description summary="make the surface a fullscreen surface">
        Map the surface as a fullscreen surface.

        If an output parameter is given then the surface will be made
        fullscreen on that output. If the client does not specify the
        output then the compositor will apply its policy - usually
        choosing the output on which the surface has the biggest surface
        area.

        The client may specify a method to resolve a size conflict
        between the output size and the surface size - this is provided
        through the method parameter.

        The framerate parameter is used only when the method is set
        to "driver", to indicate the preferred framerate. A value of 0
        indicates that the client does not care about framerate.  The
        framerate is specified in mHz, that is framerate of 60000 is 60Hz.

        A method of "scale" or "driver" implies a scaling operation of
        the surface, either via a direct scaling operation or a change of
        the output mode. This will override any kind of output scaling, so
        that mapping a surface with a buffer size equal to the mode can
        fill the screen independent of buffer_scale.

        A method of "fill" means we don't scale up the buffer, however
        any output scale is applied. This means that you may run into
        an edge case where the application maps a buffer with the same
        size of the output mode but buffer_scale 1 (thus making a
        surface larger than the output). In this case it is allowed to
        downscale the results to fit the screen.

        The compositor must reply to this request with a configure event
        with the dimensions for the output on which the surface will
        be made fullscreen.
      </description>
      <arg name="method" type="uint" enum="fullscreen_method" summary="method for resolving size conflict"/>
      <arg name="framerate" type="uint" summary="framerate in mHz"/>
      <arg name="output" type="object" interface="wl_output" allow-null="true"
           summary="output on which the surface is to be fullscreen"/>
    </request>

    <request name="set_popup">
      <description summary="make the surface a popup surface">
        Map the surface as a popup.

        A popup surface is a transient surface with an added pointer
        grab.

        An existing implicit grab will be changed to owner-events mode,
        and the popup grab will continue after the implicit grab ends
        (i.e. releasing the mouse button does not cause the popup to
        be unmapped).

        The popup grab continues until the window is destroyed or a
        mouse button is pressed in any other client's window. A click
        in any of the client's surfaces is reported as normal, however,
        clicks in other clients' surfaces will be discarded and trigger
        the callback.

        The x and y arguments specify the location of the upper left
        corner of the surface relative to the upper left corner of the
        parent surface, in surface-local coordinates.
      </description>
      <arg name="seat" type="object" interface="wl_seat" summary="seat whose pointer is used"/>
      <arg name="serial" type="uint" summary="serial number of the implicit grab on the pointer"/>
      <arg name="parent" type="object" interface="wl_surface" summary="parent surface"/>
      <arg name="x" type="int" summary="surface-local x coordinate"/>
      <arg name="y" type="int" summary="surface-local y coordinate"/>
      <arg name="flags" type="uint" enum="transient" summary="transient surface behavior"/>
    </request>

    <request name="set_maximized">
      <description summary="make the surface a maximized surface">
        Map the surface as a maximized surface.

        If an output parameter is given then the surface will be
        maximized on that output. If the client does not specify the
        output then the compositor will apply its policy - usually
        choosing the output on which the surface has the biggest surface
        area.

        The compositor will reply with a configure event telling
        the expected new surface size. The operation is completed
        on the next buffer attach to this surface.

        A maximized surface typically fills the entire output it is
        bound to, except for desktop elements such as panels. This is
        the main difference between a maximized shell surface and a
        fullscreen shell surface.

        The details depend on the compositor implementation.
      </description>
      <arg name="output" type="object" interface="wl_output" allow-null="true"
           summary="output on which the surface is to be maximized"/>
    </request>

    <request name="set_title">
      <description summary="set surface title">
        Set a short title for the surface.

        This string may be used to identify the surface in a task bar,
        window list, or other user interface elements provided by the
        compositor.

        The string must be encoded in UTF-8.
      </description>
      <arg name="title" type="string" summary="surface title"/>
    </request>

    <request name="set_class">
      <description summary="set surface class">
        Set a class for the surface.

        The surface class identifies the general class of applications
        to which the surface belongs. A common convention is to use the
        file name (or the full path if it is a non-standard location) of
        the application's .desktop file as the class.
      </description>
      <arg name="class_" type="string" summary="surface class"/>
    </request>

    <event name="ping">
      <description summary="ping client">
        Ping a client to check if it is receiving events and sending
        requests. A client is expected to reply with a pong request.
      </description>
      <arg name="serial" type="uint" summary="serial number of the ping"/>
    </event>

    <event name="configure">
      <description summary="suggest resize">
        The configure event asks the client to resize its surface.

        The size is a hint, in the sense that the client is free to
        ignore it if it doesn't resize, pick a smaller size (to
        satisfy aspect ratio or resize in steps of NxM pixels).

        The edges parameter provides a hint about how the surface
        was resized. The client may use this information to decide
        how to adjust its content to the new size (e.g. a scrolling
        area might adjust its content position to leave the viewable
        content unmoved).

        The client is free to dismiss all but the last configure
        event it received.

        The width and height arguments specify the size of the window
        in surface-local coordinates.
      </description>
      <arg name="edges" type="uint" enum="resize" summary="how the surface was resized"/>
      <arg name="width" type="int" summary="new width of the surface"/>
      <arg name="height" type="int" summary="new height of the surface"/>
    </event>

    <event name="popup_done">
      <description summary="popup interaction is done">
        The popup_done event is sent out when a popup grab is broken,
        that is, when the user clicks a surface that doesn't belong
        to the client owning the popup surface.
      </description>
    </event>
  </interface>

  <interface name="wl_surface" version="7">
    <description summary="an onscreen surface">
      A surface is a rectangular area that may be displayed on zero
      or more outputs, and shown any number of times at the compositor's
      discretion. They can present wl_buffers, receive user input, and
      define a local coordinate system.

      The size of a surface (and relative positions on it) is described
      in surface-local coordinates, which may differ from the buffer
      coordinates of the pixel content, in case a buffer_transform
      or a buffer_scale is used.

      A surface without a "role" is fairly useless: a compositor does
      not know where, when or how to present it. The role is the
      purpose of a wl_surface. Examples of roles are a cursor for a
      pointer (as set by wl_pointer.set_cursor), a drag icon
      (wl_data_device.start_drag), a sub-surface
      (wl_subcompositor.get_subsurface), and a window as defined by a
      shell protocol (e.g. wl_shell.get_shell_surface).

      A surface can have only one role at a time. Initially a
      wl_surface does not have a role. Once a wl_surface is given a
      role, it is set permanently for the whole lifetime of the
      wl_surface object. Giving the current role again is allowed,
      unless explicitly forbidden by the relevant interface
      specification.

      Surface roles are given by requests in other interfaces such as
      wl_pointer.set_cursor. The request should explicitly mention
      that this request gives a role to a wl_surface. Often, this
      request also creates a new protocol object that represents the
      role and adds additional functionality to wl_surface. When a
      client wants to destroy a wl_surface, they must destroy this role
      object before the wl_surface, otherwise a defunct_role_object error is
      sent.

      Destroying the role object does not remove the role from the
      wl_surface, but it may stop the wl_surface from "playing the role".
      For instance, if a wl_subsurface object is destroyed, the wl_surface
      it was created for will be unmapped and forget its position and
      z-order. It is allowed to create a wl_subsurface for the same
      wl_surface again, but it is not allowed to use the wl_surface as
      a cursor (cursor is a different role than sub-surface, and role
      switching is not allowed).
    </description>

    <enum name="error">
      <description summary="wl_surface error values">
        These errors can be emitted in response to wl_surface requests.
      </description>
      <entry name="invalid_scale" value="0" summary="buffer scale value is invalid"/>
      <entry name="invalid_transform" value="1" summary="buffer transform value is invalid"/>
      <entry name="invalid_size" value="2" summary="buffer size is invalid"/>
      <entry name="invalid_offset" value="3" summary="buffer offset is invalid"/>
      <entry name="defunct_role_object" value="4"
             summary="surface was destroyed before its role object"/>
      <entry name="no_buffer" value="5" summary="no buffer was attached"/>
    </enum>

    <request name="destroy" type="destructor">
      <description summary="delete surface">
        Deletes the surface and invalidates its object ID.
      </description>
    </request>

    <request name="attach">
      <description summary="set the surface contents">
        Set a buffer as the content of this surface.

        The new size of the surface is calculated based on the buffer
        size transformed by the inverse buffer_transform and the
        inverse buffer_scale. This means that at commit time the supplied
        buffer size must be an integer multiple of the buffer_scale. If
        that's not the case, an invalid_size error is sent.

        The x and y arguments specify the location of the new pending
        buffer's upper left corner, relative to the current buffer's upper
        left corner, in surface-local coordinates. In other words, the
        x and y, combined with the new surface size define in which
        directions the surface's size changes. Setting anything other than 0
        as x and y arguments is discouraged, and should instead be replaced
        with using the separate wl_surface.offset request.

        When the bound wl_surface version is 5 or higher, passing any
        non-zero x or y is a protocol violation, and will result in an
        'invalid_offset' error being raised. The x and y arguments are ignored
        and do not change the pending state. To achieve equivalent semantics,
        use wl_surface.offset.

        Surface contents are double-buffered state, see wl_surface.commit.

        The initial surface contents are void; there is no content.
        wl_surface.attach assigns the given wl_buffer as the pending
        wl_buffer. wl_surface.commit makes the pending wl_buffer the new
        surface contents, and the size of the surface becomes the size
        calculated from the wl_buffer, as described above. After commit,
        there is no pending buffer until the next attach.

        Committing a pending wl_buffer allows the compositor to read the
        pixels in the wl_buffer. The compositor may access the pixels at
        any time after the wl_surface.commit request. When the compositor
        will not access the pixels anymore, it will send the
        wl_buffer.release event. Only after receiving wl_buffer.release,
        the client may reuse the wl_buffer. A wl_buffer that has been
        attached and then replaced by another attach instead of committed
        will not receive a release event, and is not used by the
        compositor.

        If a pending wl_buffer has been committed to more than one wl_surface,
        the delivery of wl_buffer.release events becomes undefined. A well
        behaved client should not rely on wl_buffer.release events in this
        case. Instead, clients hitting this case should use
        wl_surface.get_release or use a protocol extension providing per-commit
        release notifications (if none of these options are available, a
        fallback can be implemented by creating multiple wl_buffer objects from
        the same backing storage).

        Destroying the wl_buffer after wl_buffer.release does not change
        the surface contents. Destroying the wl_buffer before wl_buffer.release
        is allowed as long as the underlying buffer storage isn't re-used (this
        can happen e.g. on client process termination). However, if the client
        destroys the wl_buffer before receiving the wl_buffer.release event and
        mutates the underlying buffer storage, the surface contents become
        undefined immediately.

        If wl_surface.attach is sent with a NULL wl_buffer, the
        following wl_surface.commit will remove the surface content.

        If a pending wl_buffer has been destroyed, the result is not specified.
        Many compositors are known to remove the surface content on the following
        wl_surface.commit, but this behaviour is not universal. Clients seeking to
        maximise compatibility should not destroy pending buffers and should
        ensure that they explicitly remove content from surfaces, even after
        destroying buffers.
      </description>
      <arg name="buffer" type="object" interface="wl_buffer" allow-null="true"
           summary="buffer of surface contents"/>
      <arg name="x" type="int" summary="surface-local x coordinate"/>
      <arg name="y" type="int" summary="surface-local y coordinate"/>
    </request>

    <request name="damage">
      <description summary="mark part of the surface damaged">
        This request is used to describe the regions where the pending
        buffer is different from the current surface contents, and where
        the surface therefore needs to be repainted. The compositor
        ignores the parts of the damage that fall outside of the surface.

        Damage is double-buffered state, see wl_surface.commit.

        The damage rectangle is specified in surface-local coordinates,
        where x and y specify the upper left corner of the damage rectangle.

        The initial value for pending damage is empty: no damage.
        wl_surface.damage adds pending damage: the new pending damage
        is the union of old pending damage and the given rectangle.

        wl_surface.commit assigns pending damage as the current damage,
        and clears pending damage. The server will clear the current
        damage as it repaints the surface.

        Note! New clients should not use this request. Instead damage can be
        posted with wl_surface.damage_buffer which uses buffer coordinates
        instead of surface coordinates.
      </description>
      <arg name="x" type="int" summary="surface-local x coordinate"/>
      <arg name="y" type="int" summary="surface-local y coordinate"/>
      <arg name="width" type="int" summary="width of damage rectangle"/>
      <arg name="height" type="int" summary="height of damage rectangle"/>
    </request>

    <request name="frame">
      <description summary="request a frame throttling hint">
        Request a notification when it is a good time to start drawing a new
        frame, by creating a frame callback. This is useful for throttling
        redrawing operations, and driving animations.

        When a client is animating on a wl_surface, it can use the 'frame'
        request to get notified when it is a good time to draw and commit the
        next frame of animation. If the client commits an update earlier than
        that, it is likely that some updates will not make it to the display,
        and the client is wasting resources by drawing too often.

        The frame request will take effect on the next wl_surface.commit.
        The notification will only be posted for one frame unless
        requested again. For a wl_surface, the notifications are posted in
        the order the frame requests were committed.

        The server must send the notifications so that a client
        will not send excessive updates, while still allowing
        the highest possible update rate for clients that wait for the reply
        before drawing again. The server should give some time for the client
        to draw and commit after sending the frame callback events to let it
        hit the next output refresh.

        A server should avoid signaling the frame callbacks if the
        surface is not visible in any way, e.g. the surface is off-screen,
        or completely obscured by other opaque surfaces.

        The object returned by this request will be destroyed by the
        compositor after the callback is fired and as such the client must not
        attempt to use it after that point.

        The callback_data passed in the callback is the current time, in
        milliseconds, with an undefined base.
      </description>
      <arg name="callback" type="new_id" interface="wl_callback" summary="callback object for the frame request"/>
    </request>

    <request name="set_opaque_region">
      <description summary="set opaque region">
        This request sets the region of the surface that contains
        opaque content.

        The opaque region is an optimization hint for the compositor
        that lets it optimize the redrawing of content behind opaque
        regions.  Setting an opaque region is not required for correct
        behaviour, but marking transparent content as opaque will result
        in repaint artifacts.

        The opaque region is specified in surface-local coordinates.

        The compositor ignores the parts of the opaque region that fall
        outside of the surface.

        Opaque region is double-buffered state, see wl_surface.commit.

        wl_surface.set_opaque_region changes the pending opaque region.
        wl_surface.commit copies the pending region to the current region.
        Otherwise, the pending and current regions are never changed.

        The initial value for an opaque region is empty. Setting the pending
        opaque region has copy semantics, and the wl_region object can be
        destroyed immediately. A NULL wl_region causes the pending opaque
        region to be set to empty.
      </description>
      <arg name="region" type="object" interface="wl_region" allow-null="true"
           summary="opaque region of the surface"/>
    </request>

    <request name="set_input_region">
      <description summary="set input region">
        This request sets the region of the surface that can receive
        pointer and touch events.

        Input events happening outside of this region will try the next
        surface in the server surface stack. The compositor ignores the
        parts of the input region that fall outside of the surface.

        The input region is specified in surface-local coordinates.

        Input region is double-buffered state, see wl_surface.commit.

        wl_surface.set_input_region changes the pending input region.
        wl_surface.commit copies the pending region to the current region.
        Otherwise the pending and current regions are never changed,
        except cursor and icon surfaces are special cases, see
        wl_pointer.set_cursor and wl_data_device.start_drag.

        The initial value for an input region is infinite. That means the
        whole surface will accept input. Setting the pending input region
        has copy semantics, and the wl_region object can be destroyed
        immediately. A NULL wl_region causes the input region to be set
        to infinite.
      </description>
      <arg name="region" type="object" interface="wl_region" allow-null="true"
           summary="input region of the surface"/>
    </request>

    <request name="commit">
      <description summary="commit pending surface state">
        Surface state (input, opaque, and damage regions, attached buffers,
        etc.) is double-buffered. Protocol requests modify the pending state,
        as opposed to the active state in use by the compositor.

        All requests that need a commit to become effective are documented
        to affect double-buffered state.

        Other interfaces may add further double-buffered surface state.

        A commit request atomically creates a Content Update (CU) from the
        pending state, even if the pending state has not been touched. The
        content update is placed at the end of a per-surface queue until it
        becomes active. After commit, the new pending state is as documented for
        each related request.

        A CU is either a Desync Content Update (DCU) or a Sync Content Update
        (SCU). If the surface is effectively synchronized at the commit request,
        it is a SCU, otherwise a DCU.

        When a surface transitions from effectively synchronized to effectively
        desynchronized, all SCUs in its queue which are not reachable by any
        DCU become DCUs and dependency edges from outside the queue to these CUs
        are removed.

        See wl_subsurface for the definition of 'effectively synchronized' and
        'effectively desynchronized'.

        When a CU is placed in the queue, the CU has a dependency on the CU in
        front of it and to the SCU at end of the queue of every direct child
        surface if that SCU exists and does not have another dependent. This can
        form a directed acyclic graph of CUs with dependencies as edges.

        In addition to surface state, the CU can have constraints that must be
        satisfied before it can be applied. Other interfaces may add CU
        constraints.

        All DCUs which do not have a SCU in front of themselves in their queue,
        are candidates. If the graph that's reachable by a candidate does not
        have any unsatisfied constraints, the entire graph must be applied
        atomically.

        When a CU is applied, the wl_buffer is applied before all other state.
        This means that all coordinates in double-buffered state are relative to
        the newly attached wl_buffers, except for wl_surface.attach itself. If
        there is no newly attached wl_buffer, the coordinates are relative to
        the previous content update.
      </description>
    </request>

    <event name="enter">
      <description summary="surface enters an output">
        This is emitted whenever a surface's creation, movement, or resizing
        results in some part of it being within the scanout region of an
        output.

        Note that a surface may be overlapping with zero or more outputs.
      </description>
      <arg name="output" type="object" interface="wl_output" summary="output entered by the surface"/>
    </event>

    <event name="leave">
      <description summary="surface leaves an output">
        This is emitted whenever a surface's creation, movement, or resizing
        results in it no longer having any part of it within the scanout region
        of an output.

        Clients should not use the number of outputs the surface is on for frame
        throttling purposes. The surface might be hidden even if no leave event
        has been sent, and the compositor might expect new surface content
        updates even if no enter event has been sent. The frame event should be
        used instead.
      </description>
      <arg name="output" type="object" interface="wl_output" summary="output left by the surface"/>
    </event>

    <!-- Version 2 additions -->

    <request name="set_buffer_transform" since="2">
      <description summary="sets the buffer transformation">
        This request sets the transformation that the client has already applied
        to the content of the buffer. The accepted values for the transform
        parameter are the values for wl_output.transform.

        The compositor applies the inverse of this transformation whenever it
        uses the buffer contents.

        Buffer transform is double-buffered state, see wl_surface.commit.

        A newly created surface has its buffer transformation set to normal.

        wl_surface.set_buffer_transform changes the pending buffer
        transformation. wl_surface.commit copies the pending buffer
        transformation to the current one. Otherwise, the pending and current
        values are never changed.

        The purpose of this request is to allow clients to render content
        according to the output transform, thus permitting the compositor to
        use certain optimizations even if the display is rotated. Using
        hardware overlays and scanning out a client buffer for fullscreen
        surfaces are examples of such optimizations. Those optimizations are
        highly dependent on the compositor implementation, so the use of this
        request should be considered on a case-by-case basis.

        Note that if the transform value includes 90 or 270 degree rotation,
        the width of the buffer will become the surface height and the height
        of the buffer will become the surface width.

        If transform is not one of the values from the
        wl_output.transform enum the invalid_transform protocol error
        is raised.
      </description>
      <arg name="transform" type="int" enum="wl_output.transform"
           summary="transform for interpreting buffer contents"/>
    </request>

    <!-- Version 3 additions -->

    <request name="set_buffer_scale" since="3">
      <description summary="sets the buffer scaling factor">
        This request sets an optional scaling factor on how the compositor
        interprets the contents of the buffer attached to the window.

        Buffer scale is double-buffered state, see wl_surface.commit.

        A newly created surface has its buffer scale set to 1.

        wl_surface.set_buffer_scale changes the pending buffer scale.
        wl_surface.commit copies the pending buffer scale to the current one.
        Otherwise, the pending and current values are never changed.

        The purpose of this request is to allow clients to supply higher
        resolution buffer data for use on high resolution outputs. It is
        intended that you pick the same buffer scale as the scale of the
        output that the surface is displayed on. This means the compositor
        can avoid scaling when rendering the surface on that output.

        Note that if the scale is larger than 1, then you have to attach
        a buffer that is larger (by a factor of scale in each dimension)
        than the desired surface size.

        If scale is not greater than 0 the invalid_scale protocol error is
        raised.
      </description>
      <arg name="scale" type="int"
           summary="scale for interpreting buffer contents"/>
    </request>

    <!-- Version 4 additions -->
    <request name="damage_buffer" since="4">
      <description summary="mark part of the surface damaged using buffer coordinates">
        This request is used to describe the regions where the pending
        buffer is different from the current surface contents, and where
        the surface therefore needs to be repainted. The compositor
        ignores the parts of the damage that fall outside of the surface.

        Damage is double-buffered state, see wl_surface.commit.

        The damage rectangle is specified in buffer coordinates,
        where x and y specify the upper left corner of the damage rectangle.

        The initial value for pending damage is empty: no damage.
        wl_surface.damage_buffer adds pending damage: the new pending
        damage is the union of old pending damage and the given rectangle.

        wl_surface.commit assigns pending damage as the current damage,
        and clears pending damage. The server will clear the current
        damage as it repaints the surface.

        This request differs from wl_surface.damage in only one way - it
        takes damage in buffer coordinates instead of surface-local
        coordinates. While this generally is more intuitive than surface
        coordinates, it is especially desirable when using wp_viewport
        or when a drawing library (like EGL) is unaware of buffer scale
        and buffer transform.

        Note: Because buffer transformation changes and damage requests may
        be interleaved in the protocol stream, it is impossible to determine
        the actual mapping between surface and buffer damage until
        wl_surface.commit time. Therefore, compositors wishing to take both
        kinds of damage into account will have to accumulate damage from the
        two requests separately and only transform from one to the other
        after receiving the wl_surface.commit.
      </description>
      <arg name="x" type="int" summary="buffer-local x coordinate"/>
      <arg name="y" type="int" summary="buffer-local y coordinate"/>
      <arg name="width" type="int" summary="width of damage rectangle"/>
      <arg name="height" type="int" summary="height of damage rectangle"/>
    </request>

    <!-- Version 5 additions -->

    <request name="offset" since="5">
      <description summary="set the surface contents offset">
        The x and y arguments specify the location of the new pending
        buffer's upper left corner, relative to the current buffer's upper
        left corner, in surface-local coordinates. In other words, the
        x and y, combined with the new surface size define in which
        directions the surface's size changes.

        The exact semantics of wl_surface.offset are role-specific. Refer to
        the documentation of specific roles for more information.

        Surface location offset is double-buffered state, see
        wl_surface.commit.

        This request is semantically equivalent to and the replaces the x and y
        arguments in the wl_surface.attach request in wl_surface versions prior
        to 5. See wl_surface.attach for details.
      </description>
      <arg name="x" type="int" summary="surface-local x coordinate"/>
      <arg name="y" type="int" summary="surface-local y coordinate"/>
    </request>

    <!-- Version 6 additions -->

    <event name="preferred_buffer_scale" since="6">
      <description summary="preferred buffer scale for the surface">
        This event indicates the preferred buffer scale for this surface. It is
        sent whenever the compositor's preference changes.

        Before receiving this event the preferred buffer scale for this surface
        is 1.

        It is intended that scaling aware clients use this event to scale their
        content and use wl_surface.set_buffer_scale to indicate the scale they
        have rendered with. This allows clients to supply a higher detail
        buffer.

        The compositor shall emit a scale value greater than 0.
      </description>
      <arg name="factor" type="int" summary="preferred scaling factor"/>
    </event>

    <event name="preferred_buffer_transform" since="6">
      <description summary="preferred buffer transform for the surface">
        This event indicates the preferred buffer transform for this surface.
        It is sent whenever the compositor's preference changes.

        Before receiving this event the preferred buffer transform for this
        surface is normal.

        Applying this transformation to the surface buffer contents and using
        wl_surface.set_buffer_transform might allow the compositor to use the
        surface buffer more efficiently.
      </description>
      <arg name="transform" type="uint" enum="wl_output.transform"
           summary="preferred transform"/>
    </event>

    <!-- Version 7 additions -->

    <request name="get_release" since="7">
      <description summary="get a release callback">
        Create a callback for the release of the buffer attached by the client
        with wl_surface.attach.

        The compositor will release the buffer when it has finished its usage of
        the underlying storage for the relevant commit. Once the client receives
        this event, and assuming the associated buffer is not pending release
        from other wl_surface.commit requests, the client can safely re-use the
        buffer.

        Release callbacks are double-buffered state, and will be associated
        with the pending buffer at wl_surface.commit time.

        The callback_data passed in the wl_callback.done event is unused and
        is always zero.

        Sending this request without attaching a non-null buffer in the same
        content update is a protocol error. The compositor will send the
        no_buffer error in this case.
      </description>
      <arg name="callback" type="new_id" interface="wl_callback" summary="callback object for the release"/>
    </request>
   </interface>

  <interface name="wl_seat" version="11">
    <description summary="group of input devices">
      A seat is a group of keyboards, pointer and touch devices. This
      object is published as a global during start up, or when such a
      device is hot plugged.  A seat typically has a pointer and
      maintains a keyboard focus and a pointer focus.
    </description>

    <enum name="capability" bitfield="true">
      <description summary="seat capability bitmask">
        This is a bitmask of capabilities this seat has; if a member is
        set, then it is present on the seat.
      </description>
      <entry name="pointer" value="1" summary="the seat has pointer devices"/>
      <entry name="keyboard" value="2" summary="the seat has one or more keyboards"/>
      <entry name="touch" value="4" summary="the seat has touch devices"/>
    </enum>

    <enum name="error">
      <description summary="wl_seat error values">
        These errors can be emitted in response to wl_seat requests.
      </description>
      <entry name="missing_capability" value="0"
             summary="get_pointer, get_keyboard or get_touch called on seat without the matching capability"/>
    </enum>

    <event name="capabilities">
      <description summary="seat capabilities changed">
        This is sent on binding to the seat global or whenever a seat gains
        or loses the pointer, keyboard or touch capabilities.
        The argument is a capability enum containing the complete set of
        capabilities this seat has.

        When the pointer capability is added, a client may create a
        wl_pointer object using the wl_seat.get_pointer request. This object
        will receive pointer events until the capability is removed in the
        future.

        When the pointer capability is removed, a client should destroy the
        wl_pointer objects associated with the seat where the capability was
        removed, using the wl_pointer.release request. No further pointer
        events will be received on these objects.

        In some compositors, if a seat regains the pointer capability and a
        client has a previously obtained wl_pointer object of version 4 or
        less, that object may start sending pointer events again. This
        behavior is considered a misinterpretation of the intended behavior
        and must not be relied upon by the client. wl_pointer objects of
        version 5 or later must not send events if created before the most
        recent event notifying the client of an added pointer capability.

        The above behavior also applies to wl_keyboard and wl_touch with the
        keyboard and touch capabilities, respectively.
      </description>
      <arg name="capabilities" type="uint" enum="capability" summary="capabilities of the seat"/>
    </event>

    <request name="get_pointer">
      <description summary="return pointer object">
        The ID provided will be initialized to the wl_pointer interface
        for this seat.

        This request only takes effect if the seat has the pointer
        capability, or has had the pointer capability in the past.
        It is a protocol violation to issue this request on a seat that has
        never had the pointer capability. The missing_capability error will
        be sent in this case.
      </description>
      <arg name="id" type="new_id" interface="wl_pointer" summary="seat pointer"/>
    </request>

    <request name="get_keyboard">
      <description summary="return keyboard object">
        The ID provided will be initialized to the wl_keyboard interface
        for this seat.

        This request only takes effect if the seat has the keyboard
        capability, or has had the keyboard capability in the past.
        It is a protocol violation to issue this request on a seat that has
        never had the keyboard capability. The missing_capability error will
        be sent in this case.
      </description>
      <arg name="id" type="new_id" interface="wl_keyboard" summary="seat keyboard"/>
    </request>

    <request name="get_touch">
      <description summary="return touch object">
        The ID provided will be initialized to the wl_touch interface
        for this seat.

        This request only takes effect if the seat has the touch
        capability, or has had the touch capability in the past.
        It is a protocol violation to issue this request on a seat that has
        never had the touch capability. The missing_capability error will
        be sent in this case.
      </description>
      <arg name="id" type="new_id" interface="wl_touch" summary="seat touch interface"/>
    </request>

    <!-- Version 2 additions -->

    <event name="name" since="2">
      <description summary="unique identifier for this seat">
        In a multi-seat configuration the seat name can be used by clients to
        help identify which physical devices the seat represents.

        The seat name is a UTF-8 string with no convention defined for its
        contents. Each name is unique among all wl_seat globals. The name is
        only guaranteed to be unique for the current compositor instance.

        The same seat names are used for all clients. Thus, the name can be
        shared across processes to refer to a specific wl_seat global.

        The name event is sent after binding to the seat global, and should be sent
        before announcing capabilities. This event is only sent once per seat object,
        and the name does not change over the lifetime of the wl_seat global.

        Compositors may re-use the same seat name if the wl_seat global is
        destroyed and re-created later.
      </description>
      <arg name="name" type="string" summary="seat identifier"/>
    </event>

    <!-- Version 5 additions -->

    <request name="release" type="destructor" since="5">
      <description summary="release the seat object">
        Using this request a client can tell the server that it is not going to
        use the seat object anymore.
      </description>
    </request>

  </interface>

  <interface name="wl_pointer" version="11">
    <description summary="pointer input device">
      The wl_pointer interface represents one or more input devices,
      such as mice, which control the pointer location and pointer_focus
      of a seat.

      The wl_pointer interface generates motion, enter and leave
      events for the surfaces that the pointer is located over,
      and button and axis events for button presses, button releases
      and scrolling.
    </description>

    <enum name="error">
      <entry name="role" value="0" summary="given wl_surface has another role"/>
    </enum>

    <request name="set_cursor">
      <description summary="set the pointer surface">
        Set the pointer surface, i.e., the surface that contains the
        pointer image (cursor). This request gives the surface the role
        of a cursor. If the surface already has another role, it raises
        a protocol error.

        The cursor actually changes only if the pointer
        focus for this device is one of the requesting client's surfaces
        or the surface parameter is the current pointer surface. If
        there was a previous surface set with this request it is
        replaced. If surface is NULL, the pointer image is hidden.

        The parameters hotspot_x and hotspot_y define the position of
        the pointer surface relative to the pointer location. Its
        top-left corner is always at (x, y) - (hotspot_x, hotspot_y),
        where (x, y) are the coordinates of the pointer location, in
        surface-local coordinates.

        On wl_surface.offset requests to the pointer surface, hotspot_x
        and hotspot_y are decremented by the x and y parameters
        passed to the request. The offset must be applied by
        wl_surface.commit as usual.

        The hotspot can also be updated by passing the currently set
        pointer surface to this request with new values for hotspot_x
        and hotspot_y.

        The input region is ignored for wl_surfaces with the role of
        a cursor. When the use as a cursor ends, the wl_surface is
        unmapped.

        The serial parameter must match the latest wl_pointer.enter
        serial number sent to the client. Otherwise the request will be
        ignored.
      </description>
      <arg name="serial" type="uint" summary="serial number of the enter event"/>
      <arg name="surface" type="object" interface="wl_surface" allow-null="true"
           summary="pointer surface"/>
      <arg name="hotspot_x" type="int" summary="surface-local x coordinate"/>
      <arg name="hotspot_y" type="int" summary="surface-local y coordinate"/>
    </request>

    <event name="enter">
      <description summary="enter event">
        Notification that this seat's pointer is focused on a certain
        surface.

        When a seat's focus enters a surface, the pointer image
        is undefined and a client should respond to this event by setting
        an appropriate pointer image with the set_cursor request.
      </description>
      <arg name="serial" type="uint" summary="serial number of the enter event"/>
      <arg name="surface" type="object" interface="wl_surface" summary="surface entered by the pointer"/>
      <arg name="surface_x" type="fixed" summary="surface-local x coordinate"/>
      <arg name="surface_y" type="fixed" summary="surface-local y coordinate"/>
    </event>

    <event name="leave">
      <description summary="leave event">
        Notification that this seat's pointer is no longer focused on
        a certain surface.

        The leave notification is sent before the enter notification
        for the new focus.
      </description>
      <arg name="serial" type="uint" summary="serial number of the leave event"/>
      <arg name="surface" type="object" interface="wl_surface" summary="surface left by the pointer"/>
    </event>

    <event name="motion">
      <description summary="pointer motion event">
        Notification of pointer location change. The arguments
        surface_x and surface_y are the location relative to the
        focused surface.
      </description>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="surface_x" type="fixed" summary="surface-local x coordinate"/>
      <arg name="surface_y" type="fixed" summary="surface-local y coordinate"/>
    </event>

    <enum name="button_state">
      <description summary="physical button state">
        Describes the physical state of a button that produced the button
        event.
      </description>
      <entry name="released" value="0" summary="the button is not pressed"/>
      <entry name="pressed" value="1" summary="the button is pressed"/>
    </enum>

    <event name="button">
      <description summary="pointer button event">
        Mouse button click and release notifications.

        The location of the click is given by the last motion, warp or
        enter event.
        The time argument is a timestamp with millisecond
        granularity, with an undefined base.

        The button is a button code as defined in the Linux kernel's
        linux/input-event-codes.h header file, e.g. BTN_LEFT.

        Any 16-bit button code value is reserved for future additions to the
        kernel's event code list. All other button codes above 0xFFFF are
        currently undefined but may be used in future versions of this
        protocol.
      </description>
      <arg name="serial" type="uint" summary="serial number of the button event"/>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="button" type="uint" summary="button that produced the event"/>
      <arg name="state" type="uint" enum="button_state" summary="physical state of the button"/>
    </event>

    <enum name="axis">
      <description summary="axis types">
        Describes the axis types of scroll events.
      </description>
      <entry name="vertical_scroll" value="0" summary="vertical axis"/>
      <entry name="horizontal_scroll" value="1" summary="horizontal axis"/>
    </enum>

    <event name="axis">
      <description summary="axis event">
        Scroll and other axis notifications.

        For scroll events (vertical and horizontal scroll axes), the
        value parameter is the length of a vector along the specified
        axis in a coordinate space identical to those of motion events,
        representing a relative movement along the specified axis.

        For devices that support movements non-parallel to axes multiple
        axis events will be emitted.

        When applicable, for example for touch pads, the server can
        choose to emit scroll events where the motion vector is
        equivalent to a motion event vector.

        When applicable, a client can transform its content relative to the
        scroll distance.
      </description>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="axis" type="uint" enum="axis" summary="axis type"/>
      <arg name="value" type="fixed" summary="length of vector in surface-local coordinate space"/>
    </event>

    <!-- Version 3 additions -->

    <request name="release" type="destructor" since="3">
      <description summary="release the pointer object">
        Using this request a client can tell the server that it is not going to
        use the pointer object anymore.

        This request destroys the pointer proxy object, so clients must not call
        wl_pointer_destroy() after using this request.
      </description>
    </request>

    <!-- Version 5 additions -->

    <event name="frame" since="5">
      <description summary="end of a pointer event sequence">
        Indicates the end of a set of events that logically belong together.
        A client is expected to accumulate the data in all events within the
        frame before proceeding.

        All wl_pointer events before a wl_pointer.frame event belong
        logically together. For example, in a diagonal scroll motion the
        compositor will send an optional wl_pointer.axis_source event, two
        wl_pointer.axis events (horizontal and vertical) and finally a
        wl_pointer.frame event. The client may use this information to
        calculate a diagonal vector for scrolling.

        When multiple wl_pointer.axis events occur within the same frame,
        the motion vector is the combined motion of all events.
        When a wl_pointer.axis and a wl_pointer.axis_stop event occur within
        the same frame, this indicates that axis movement in one axis has
        stopped but continues in the other axis.
        When multiple wl_pointer.axis_stop events occur within the same
        frame, this indicates that these axes stopped in the same instance.

        A wl_pointer.frame event is sent for every logical event group,
        even if the group only contains a single wl_pointer event.
        Specifically, a client may get a sequence: motion, frame, button,
        frame, axis, frame, axis_stop, frame.

        The wl_pointer.enter and wl_pointer.leave events are logical events
        generated by the compositor and not the hardware. These events are
        also grouped by a wl_pointer.frame. When a pointer moves from one
        surface to another, a compositor should group the
        wl_pointer.leave event within the same wl_pointer.frame.
        However, a client must not rely on wl_pointer.leave and
        wl_pointer.enter being in the same wl_pointer.frame.
        Compositor-specific policies may require the wl_pointer.leave and
        wl_pointer.enter event being split across multiple wl_pointer.frame
        groups.
      </description>
    </event>

    <enum name="axis_source">
      <description summary="axis source types">
        Describes the source types for axis events. This indicates to the
        client how an axis event was physically generated; a client may
        adjust the user interface accordingly. For example, scroll events
        from a "finger" source may be in a smooth coordinate space with
        kinetic scrolling whereas a "wheel" source may be in discrete steps
        of a number of lines.

        The "continuous" axis source is a device generating events in a
        continuous coordinate space, but using something other than a
        finger. One example for this source is button-based scrolling where
        the vertical motion of a device is converted to scroll events while
        a button is held down.

        The "wheel tilt" axis source indicates that the actual device is a
        wheel but the scroll event is not caused by a rotation but a
        (usually sideways) tilt of the wheel.
      </description>
      <entry name="wheel" value="0" summary="a physical wheel rotation" />
      <entry name="finger" value="1" summary="finger on a touch surface" />
      <entry name="continuous" value="2" summary="continuous coordinate space"/>
      <entry name="wheel_tilt" value="3" summary="a physical wheel tilt" since="6"/>
    </enum>

    <event name="axis_source" since="5">
      <description summary="axis source event">
        Source information for scroll and other axes.

        This event does not occur on its own. It is sent before a
        wl_pointer.frame event and carries the source information for
        all events within that frame.

        The source specifies how this event was generated. If the source is
        wl_pointer.axis_source.finger, a wl_pointer.axis_stop event will be
        sent when the user lifts the finger off the device.

        If the source is wl_pointer.axis_source.wheel,
        wl_pointer.axis_source.wheel_tilt or
        wl_pointer.axis_source.continuous, a wl_pointer.axis_stop event may
        or may not be sent. Whether a compositor sends an axis_stop event
        for these sources is hardware-specific and implementation-dependent;
        clients must not rely on receiving an axis_stop event for these
        scroll sources and should treat scroll sequences from these scroll
        sources as unterminated by default.

        This event is optional. If the source is unknown for a particular
        axis event sequence, no event is sent.
        Only one wl_pointer.axis_source event is permitted per frame.

        The order of wl_pointer.axis_discrete and wl_pointer.axis_source is
        not guaranteed.
      </description>
      <arg name="axis_source" type="uint" enum="axis_source" summary="source of the axis event"/>
    </event>

    <event name="axis_stop" since="5">
      <description summary="axis stop event">
        Stop notification for scroll and other axes.

        For some wl_pointer.axis_source types, a wl_pointer.axis_stop event
        is sent to notify a client that the axis sequence has terminated.
        This enables the client to implement kinetic scrolling.
        See the wl_pointer.axis_source documentation for information on when
        this event may be generated.

        Any wl_pointer.axis events with the same axis_source after this
        event should be considered as the start of a new axis motion.

        The timestamp is to be interpreted identical to the timestamp in the
        wl_pointer.axis event. The timestamp value may be the same as a
        preceding wl_pointer.axis event.
      </description>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="axis" type="uint" enum="axis" summary="the axis stopped with this event"/>
    </event>

    <event name="axis_discrete" since="5" deprecated-since="8">
      <description summary="axis click event">
        Discrete step information for scroll and other axes.

        This event carries the axis value of the wl_pointer.axis event in
        discrete steps (e.g. mouse wheel clicks).

        This event is deprecated with wl_pointer version 8 - this event is not
        sent to clients supporting version 8 or later.

        This event does not occur on its own, it is coupled with a
        wl_pointer.axis event that represents this axis value on a
        continuous scale. The protocol guarantees that each axis_discrete
        event is always followed by exactly one axis event with the same
        axis number within the same wl_pointer.frame. Note that the protocol
        allows for other events to occur between the axis_discrete and
        its coupled axis event, including other axis_discrete or axis
        events. A wl_pointer.frame must not contain more than one axis_discrete
        event per axis type.

        This event is optional; continuous scrolling devices
        like two-finger scrolling on touchpads do not have discrete
        steps and do not generate this event.

        The discrete value carries the directional information. e.g. a value
        of -2 is two steps towards the negative direction of this axis.

        The axis number is identical to the axis number in the associated
        axis event.

        The order of wl_pointer.axis_discrete and wl_pointer.axis_source is
        not guaranteed.
      </description>
      <arg name="axis" type="uint" enum="axis" summary="axis type"/>
      <arg name="discrete" type="int" summary="number of steps"/>
    </event>

    <event name="axis_value120" since="8">
      <description summary="axis high-resolution scroll event">
        Discrete high-resolution scroll information.

        This event carries high-resolution wheel scroll information,
        with each multiple of 120 representing one logical scroll step
        (a wheel detent). For example, an axis_value120 of 30 is one quarter of
        a logical scroll step in the positive direction, a value120 of
        -240 are two logical scroll steps in the negative direction within the
        same hardware event.
        Clients that rely on discrete scrolling should accumulate the
        value120 to multiples of 120 before processing the event.

        The value120 must not be zero.

        This event replaces the wl_pointer.axis_discrete event in clients
        supporting wl_pointer version 8 or later.

        Where a wl_pointer.axis_source event occurs in the same
        wl_pointer.frame, the axis source applies to this event.

        The order of wl_pointer.axis_value120 and wl_pointer.axis_source is
        not guaranteed.
      </description>
      <arg name="axis" type="uint" enum="axis" summary="axis type"/>
      <arg name="value120" type="int" summary="scroll distance as fraction of 120"/>
    </event>

    <!-- Version 9 additions -->

    <enum name="axis_relative_direction">
      <description summary="axis relative direction">
        This specifies the direction of the physical motion that caused a
        wl_pointer.axis event, relative to the wl_pointer.axis direction.
      </description>
      <entry name="identical" value="0"
          summary="physical motion matches axis direction"/>
      <entry name="inverted" value="1"
          summary="physical motion is the inverse of the axis direction"/>
    </enum>

    <event name="axis_relative_direction" since="9">
      <description summary="axis relative physical direction event">
        Relative directional information of the entity causing the axis
        motion.

        For a wl_pointer.axis event, the wl_pointer.axis_relative_direction
        event specifies the movement direction of the entity causing the
        wl_pointer.axis event. For example:
        - if a user's fingers on a touchpad move down and this
          causes a wl_pointer.axis vertical_scroll down event, the physical
          direction is 'identical'
        - if a user's fingers on a touchpad move down and this causes a
          wl_pointer.axis vertical_scroll up scroll up event ('natural
          scrolling'), the physical direction is 'inverted'.

        A client may use this information to adjust scroll motion of
        components. Specifically, enabling natural scrolling causes the
        content to change direction compared to traditional scrolling.
        Some widgets like volume control sliders should usually match the
        physical direction regardless of whether natural scrolling is
        active. This event enables clients to match the scroll direction of
        a widget to the physical direction.

        This event does not occur on its own, it is coupled with a
        wl_pointer.axis event that represents this axis value.
        The protocol guarantees that each axis_relative_direction event is
        always followed by exactly one axis event with the same
        axis number within the same wl_pointer.frame. Note that the protocol
        allows for other events to occur between the axis_relative_direction
        and its coupled axis event.

        The axis number is identical to the axis number in the associated
        axis event.

        The order of wl_pointer.axis_relative_direction,
        wl_pointer.axis_discrete and wl_pointer.axis_source is not
        guaranteed.
      </description>
      <arg name="axis" type="uint" enum="axis" summary="axis type"/>
      <arg name="direction" type="uint" enum="axis_relative_direction"
          summary="physical direction relative to axis motion"/>
    </event>

    <!-- Version 11 additions -->

    <event name="warp" since="11">
      <description summary="pointer warp event">
	Notification of pointer location change within a surface.

	This location change is not due to events on the input device,
	but because either the surface under the pointer was moved and
	thus the relative position of the pointer changed, or because
	the compositor changed the pointer position in response to an
	event like pointer confinement being exited.

	The arguments surface_x and surface_y are the location relative to
	the focused surface.

	This event must not occur in the same wl_pointer.frame as a
	wl_pointer.enter or wl_pointer.motion event.
      </description>
      <arg name="surface_x" type="fixed" summary="surface-local x coordinate"/>
      <arg name="surface_y" type="fixed" summary="surface-local y coordinate"/>
    </event>
  </interface>

  <interface name="wl_keyboard" version="11">
    <description summary="keyboard input device">
      The wl_keyboard interface represents one or more keyboards
      associated with a seat.

      Each wl_keyboard has the following logical state:

      - an active surface (possibly null),
      - the keys currently logically down,
      - the active modifiers,
      - the active group.

      By default, the active surface is null, the keys currently logically down
      are empty, the active modifiers and the active group are 0.
    </description>

    <enum name="keymap_format">
      <description summary="keyboard mapping format">
        This specifies the format of the keymap provided to the
        client with the wl_keyboard.keymap event.
      </description>
      <entry name="no_keymap" value="0"
             summary="no keymap; client must understand how to interpret the raw keycode"/>
      <entry name="xkb_v1" value="1"
             summary="libxkbcommon compatible, null-terminated string; to determine the xkb keycode, clients must add 8 to the key event keycode"/>
    </enum>

    <event name="keymap">
      <description summary="keyboard mapping">
        This event provides a file descriptor to the client which can be
        memory-mapped in read-only mode to provide a keyboard mapping
        description.

        From version 7 onwards, the fd must be mapped with MAP_PRIVATE by
        the recipient, as MAP_SHARED may fail.
      </description>
      <arg name="format" type="uint" enum="keymap_format" summary="keymap format"/>
      <arg name="fd" type="fd" summary="keymap file descriptor"/>
      <arg name="size" type="uint" summary="keymap size, in bytes"/>
    </event>

    <event name="enter">
      <description summary="enter event">
        Notification that this seat's keyboard focus is on a certain
        surface.

        The compositor must send the wl_keyboard.modifiers event after this
        event.

        In the wl_keyboard logical state, this event sets the active surface to
        the surface argument and the keys currently logically down to the keys
        in the keys argument. The compositor must not send this event if the
        wl_keyboard already had an active surface immediately before this event.

        Clients should not use the list of pressed keys to emulate key-press
        events. The order of keys in the list is unspecified.
      </description>
      <arg name="serial" type="uint" summary="serial number of the enter event"/>
      <arg name="surface" type="object" interface="wl_surface" summary="surface gaining keyboard focus"/>
      <arg name="keys" type="array" summary="the keys currently logically down"/>
    </event>

    <event name="leave">
      <description summary="leave event">
        Notification that this seat's keyboard focus is no longer on
        a certain surface.

        The leave notification is sent before the enter notification
        for the new focus.

        In the wl_keyboard logical state, this event resets all values to their
        defaults. The compositor must not send this event if the active surface
        of the wl_keyboard was not equal to the surface argument immediately
        before this event.
      </description>
      <arg name="serial" type="uint" summary="serial number of the leave event"/>
      <arg name="surface" type="object" interface="wl_surface" summary="surface that lost keyboard focus"/>
    </event>

    <enum name="key_state">
      <description summary="physical key state">
        Describes the physical state of a key that produced the key event.

        Since version 10, the key can be in a "repeated" pseudo-state which
        means the same as "pressed", but is used to signal repetition in the
        key event.

        The key may only enter the repeated state after entering the pressed
        state and before entering the released state. This event may be
        generated multiple times while the key is down.
      </description>
      <entry name="released" value="0" summary="key is not pressed"/>
      <entry name="pressed" value="1" summary="key is pressed"/>
      <entry name="repeated" value="2" summary="key was repeated" since="10"/>
    </enum>

    <event name="key">
      <description summary="key event">
        A key was pressed or released.
        The time argument is a timestamp with millisecond
        granularity, with an undefined base.

        The key is a platform-specific key code that can be interpreted
        by feeding it to the keyboard mapping (see the keymap event).

        If this event produces a change in modifiers, then the resulting
        wl_keyboard.modifiers event must be sent after this event.

        In the wl_keyboard logical state, this event adds the key to the keys
        currently logically down (if the state argument is pressed) or removes
        the key from the keys currently logically down (if the state argument is
        released). The compositor must not send this event if the wl_keyboard
        did not have an active surface immediately before this event. The
        compositor must not send this event if state is pressed (resp. released)
        and the key was already logically down (resp. was not logically down)
        immediately before this event.

        Since version 10, compositors may send key events with the "repeated"
        key state when a wl_keyboard.repeat_info event with a rate argument of
        0 has been received. This allows the compositor to take over the
        responsibility of key repetition.
      </description>
      <arg name="serial" type="uint" summary="serial number of the key event"/>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="key" type="uint" summary="key that produced the event"/>
      <arg name="state" type="uint" enum="key_state" summary="physical state of the key"/>
    </event>

    <event name="modifiers">
      <description summary="modifier and group state">
        Notifies clients that the modifier and/or group state has
        changed, and it should update its local state.

        The compositor may send this event without a surface of the client
        having keyboard focus, for example to tie modifier information to
        pointer focus instead. If a modifier event with pressed modifiers is sent
        without a prior enter event, the client can assume the modifier state is
        valid until it receives the next wl_keyboard.modifiers event. In order to
        reset the modifier state again, the compositor can send a
        wl_keyboard.modifiers event with no pressed modifiers.

        In the wl_keyboard logical state, this event updates the modifiers and
        group.
      </description>
      <arg name="serial" type="uint" summary="serial number of the modifiers event"/>
      <arg name="mods_depressed" type="uint" summary="depressed modifiers"/>
      <arg name="mods_latched" type="uint" summary="latched modifiers"/>
      <arg name="mods_locked" type="uint" summary="locked modifiers"/>
      <arg name="group" type="uint" summary="keyboard layout"/>
    </event>

    <!-- Version 3 additions -->

    <request name="release" type="destructor" since="3">
      <description summary="release the keyboard object"/>
    </request>

    <!-- Version 4 additions -->

    <event name="repeat_info" since="4">
      <description summary="repeat rate and delay">
        Informs the client about the keyboard's repeat rate and delay.

        This event is sent as soon as the wl_keyboard object has been created,
        and is guaranteed to be received by the client before any key press
        event.

        Negative values for either rate or delay are illegal. A rate of zero
        will disable any repeating (regardless of the value of delay).

        This event can be sent later on as well with a new value if necessary,
        so clients should continue listening for the event past the creation
        of wl_keyboard.
      </description>
      <arg name="rate" type="int"
           summary="the rate of repeating keys in characters per second"/>
      <arg name="delay" type="int"
           summary="delay in milliseconds since key down until repeating starts"/>
    </event>
  </interface>

  <interface name="wl_touch" version="11">
    <description summary="touchscreen input device">
      The wl_touch interface represents a touchscreen
      associated with a seat.

      Touch interactions can consist of one or more contacts.
      For each contact, a series of events is generated, starting
      with a down event, followed by zero or more motion events,
      and ending with an up event. Events relating to the same
      contact point can be identified by the ID of the sequence.
    </description>

    <event name="down">
      <description summary="touch down event and beginning of a touch sequence">
        A new touch point has appeared on the surface. This touch point is
        assigned a unique ID. Future events from this touch point reference
        this ID. The ID ceases to be valid after a touch up event and may be
        reused in the future.
      </description>
      <arg name="serial" type="uint" summary="serial number of the touch down event"/>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="surface" type="object" interface="wl_surface" summary="surface touched"/>
      <arg name="id" type="int" summary="the unique ID of this touch point"/>
      <arg name="x" type="fixed" summary="surface-local x coordinate"/>
      <arg name="y" type="fixed" summary="surface-local y coordinate"/>
    </event>

    <event name="up">
      <description summary="end of a touch event sequence">
        The touch point has disappeared. No further events will be sent for
        this touch point and the touch point's ID is released and may be
        reused in a future touch down event.
      </description>
      <arg name="serial" type="uint" summary="serial number of the touch up event"/>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="id" type="int" summary="the unique ID of this touch point"/>
    </event>

    <event name="motion">
      <description summary="update of touch point coordinates">
        A touch point has changed coordinates.
      </description>
      <arg name="time" type="uint" summary="timestamp with millisecond granularity"/>
      <arg name="id" type="int" summary="the unique ID of this touch point"/>
      <arg name="x" type="fixed" summary="surface-local x coordinate"/>
      <arg name="y" type="fixed" summary="surface-local y coordinate"/>
    </event>

    <event name="frame">
      <description summary="end of touch frame event">
        Indicates the end of a set of events that logically belong together.
        A client is expected to accumulate the data in all events within the
        frame before proceeding.

        A wl_touch.frame terminates at least one event but otherwise no
        guarantee is provided about the set of events within a frame. A client
        must assume that any state not updated in a frame is unchanged from the
        previously known state.
      </description>
    </event>

    <event name="cancel">
      <description summary="touch session cancelled">
        Sent if the compositor decides the touch stream is a global
        gesture. No further events are sent to the clients from that
        particular gesture. Touch cancellation applies to all touch points
        currently active on this client's surface. The client is
        responsible for finalizing the touch points, future touch points on
        this surface may reuse the touch point ID.

        No frame event is required after the cancel event.
      </description>
    </event>

    <!-- Version 3 additions -->

    <request name="release" type="destructor" since="3">
      <description summary="release the touch object"/>
    </request>

    <!-- Version 6 additions -->

    <event name="shape" since="6">
      <description summary="update shape of touch point">
        Sent when a touchpoint has changed its shape.

        This event does not occur on its own. It is sent before a
        wl_touch.frame event and carries the new shape information for
        any previously reported, or new touch points of that frame.

        Other events describing the touch point such as wl_touch.down,
        wl_touch.motion or wl_touch.orientation may be sent within the
        same wl_touch.frame. A client should treat these events as a single
        logical touch point update. The order of wl_touch.shape,
        wl_touch.orientation and wl_touch.motion is not guaranteed.
        A wl_touch.down event is guaranteed to occur before the first
        wl_touch.shape event for this touch ID but both events may occur within
        the same wl_touch.frame.

        A touchpoint shape is approximated by an ellipse through the major and
        minor axis length. The major axis length describes the longer diameter
        of the ellipse, while the minor axis length describes the shorter
        diameter. Major and minor are orthogonal and both are specified in
        surface-local coordinates. The center of the ellipse is always at the
        touchpoint location as reported by wl_touch.down or wl_touch.motion.

        This event is only sent by the compositor if the touch device supports
        shape reports. The client has to make reasonable assumptions about the
        shape if it did not receive this event.
      </description>
      <arg name="id" type="int" summary="the unique ID of this touch point"/>
      <arg name="major" type="fixed" summary="length of the major axis in surface-local coordinates"/>
      <arg name="minor" type="fixed" summary="length of the minor axis in surface-local coordinates"/>
    </event>

    <event name="orientation" since="6">
      <description summary="update orientation of touch point">
        Sent when a touchpoint has changed its orientation.

        This event does not occur on its own. It is sent before a
        wl_touch.frame event and carries the new shape information for
        any previously reported, or new touch points of that frame.

        Other events describing the touch point such as wl_touch.down,
        wl_touch.motion or wl_touch.shape may be sent within the
        same wl_touch.frame. A client should treat these events as a single
        logical touch point update. The order of wl_touch.shape,
        wl_touch.orientation and wl_touch.motion is not guaranteed.
        A wl_touch.down event is guaranteed to occur before the first
        wl_touch.orientation event for this touch ID but both events may occur
        within the same wl_touch.frame.

        The orientation describes the clockwise angle of a touchpoint's major
        axis to the positive surface y-axis and is normalized to the -180 to
        +180 degree range. The granularity of orientation depends on the touch
        device, some devices only support binary rotation values between 0 and
        90 degrees.

        This event is only sent by the compositor if the touch device supports
        orientation reports.
      </description>
      <arg name="id" type="int" summary="the unique ID of this touch point"/>
      <arg name="orientation" type="fixed" summary="angle between major axis and positive surface y-axis in degrees"/>
    </event>
  </interface>

  <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
      output corresponds to a rectangular area in that space that is
      actually visible.  This typically corresponds to a monitor that
      displays part of the compositor space.  This object is published
      as global during start up, or when a monitor is hotplugged.
    </description>

    <enum name="subpixel">
      <description summary="subpixel geometry information">
        This enumeration describes how the physical
        pixels on an output are laid out.
      </description>
      <entry name="unknown" value="0" summary="unknown geometry"/>
      <entry name="none" value="1" summary="no geometry"/>
      <entry name="horizontal_rgb" value="2" summary="horizontal RGB"/>
      <entry name="horizontal_bgr" value="3" summary="horizontal BGR"/>
      <entry name="vertical_rgb" value="4" summary="vertical RGB"/>
      <entry name="vertical_bgr" value="5" summary="vertical BGR"/>
    </enum>

    <enum name="transform">
      <description summary="transformation applied to buffer contents">
        This describes transformations that clients and compositors apply to
        buffer contents.

        The flipped values correspond to an initial flip around a
        vertical axis followed by rotation.

        The purpose is mainly to allow clients to render accordingly and
        tell the compositor, so that for fullscreen surfaces, the
        compositor will still be able to scan out directly from client
        surfaces.
      </description>
      <entry name="normal" value="0" summary="no transform"/>
      <entry name="90" value="1" summary="90 degrees counter-clockwise"/>
      <entry name="180" value="2" summary="180 degrees counter-clockwise"/>
      <entry name="270" value="3" summary="270 degrees counter-clockwise"/>
      <entry name="flipped" value="4" summary="180 degree flip around a vertical axis"/>
      <entry name="flipped_90" value="5" summary="flip and rotate 90 degrees counter-clockwise"/>
      <entry name="flipped_180" value="6" summary="flip and rotate 180 degrees counter-clockwise"/>
      <entry name="flipped_270" value="7" summary="flip and rotate 270 degrees counter-clockwise"/>
    </enum>

    <event name="geometry">
      <description summary="properties of the output">
        The geometry event describes geometric properties of the output.
        The event is sent when binding to the output object and whenever
        any of the properties change.

        The physical size can be set to zero if it doesn't make sense for this
        output (e.g. for projectors or virtual outputs).

        The geometry event will be followed by a done event (starting from
        version 2).

        Clients should use wl_surface.preferred_buffer_transform instead of the
        transform advertised by this event to find the preferred buffer
        transform to use for a surface.

        Note: wl_output only advertises partial information about the output
        position and identification. Some compositors, for instance those not
        implementing a desktop-style output layout or those exposing virtual
        outputs, might fake this information. Instead of using x and y, clients
        should use xdg_output.logical_position. Instead of using make and model,
        clients should use name and description.
      </description>
      <arg name="x" type="int"
           summary="x position within the global compositor space"/>
      <arg name="y" type="int"
           summary="y position within the global compositor space"/>
      <arg name="physical_width" type="int"
           summary="width in millimeters of the output"/>
      <arg name="physical_height" type="int"
           summary="height in millimeters of the output"/>
      <arg name="subpixel" type="int" enum="subpixel"
           summary="subpixel orientation of the output"/>
      <arg name="make" type="string"
           summary="textual description of the manufacturer"/>
      <arg name="model" type="string"
           summary="textual description of the model"/>
      <arg name="transform" type="int" enum="transform"
           summary="additional transformation applied to buffer contents during presentation"/>
    </event>

    <enum name="mode" bitfield="true">
      <description summary="mode information">
        These flags describe properties of an output mode.
        They are used in the flags bitfield of the mode event.
      </description>
      <entry name="current" value="0x1"
             summary="indicates this is the current mode"/>
      <entry name="preferred" value="0x2"
             summary="indicates this is the preferred mode"/>
    </enum>

    <event name="mode">
      <description summary="advertise available modes for the output">
        The mode event describes an available mode for the output.

        The event is sent when binding to the output object and there
        will always be one mode, the current mode.  The event is sent
        again if an output changes mode, for the mode that is now
        current.  In other words, the current mode is always the last
        mode that was received with the current flag set.

        Non-current modes are deprecated. A compositor can decide to only
        advertise the current mode and never send other modes. Clients
        should not rely on non-current modes.

        The size of a mode is given in physical hardware units of
        the output device. This is not necessarily the same as
        the output size in the global compositor space. For instance,
        the output may be scaled, as described in wl_output.scale,
        or transformed, as described in wl_output.transform. Clients
        willing to retrieve the output size in the global compositor
        space should use xdg_output.logical_size instead.

        The vertical refresh rate can be set to zero if it doesn't make
        sense for this output (e.g. for virtual outputs).

        The mode event will be followed by a done event (starting from
        version 2).

        Clients should not use the refresh rate to schedule frames. Instead,
        they should use the wl_surface.frame event or the presentation-time
        protocol.

        Note: this information is not always meaningful for all outputs. Some
        compositors, such as those exposing virtual outputs, might fake the
        refresh rate or the size.
      </description>
      <arg name="flags" type="uint" enum="mode" summary="bitfield of mode flags"/>
      <arg name="width" type="int" summary="width of the mode in hardware units"/>
      <arg name="height" type="int" summary="height of the mode in hardware units"/>
      <arg name="refresh" type="int" summary="vertical refresh rate in mHz"/>
    </event>

    <!-- Version 2 additions -->

    <event name="done" since="2">
      <description summary="sent all information about output">
        This event is sent after all other properties have been
        sent after binding to the output object and after any
        other property changes done after that. This allows
        changes to the output properties to be seen as
        atomic, even if they happen via multiple events.
      </description>
    </event>

    <event name="scale" since="2">
      <description summary="output scaling properties">
        This event contains scaling geometry information
        that is not in the geometry event. It may be sent after
        binding the output object or if the output scale changes
        later. The compositor will emit a non-zero, positive
        value for scale. If it is not sent, the client should
        assume a scale of 1.

        A scale larger than 1 means that the compositor will
        automatically scale surface buffers by this amount
        when rendering. This is used for very high resolution
        displays where applications rendering at the native
        resolution would be too small to be legible.

        Clients should use wl_surface.preferred_buffer_scale
        instead of this event to find the preferred buffer
        scale to use for a surface.

        The scale event will be followed by a done event.
      </description>
      <arg name="factor" type="int" summary="scaling factor of output"/>
    </event>

    <!-- Version 3 additions -->

    <request name="release" type="destructor" since="3">
      <description summary="release the output object">
        Using this request a client can tell the server that it is not going to
        use the output object anymore.
      </description>
    </request>

    <!-- Version 4 additions -->

    <event name="name" since="4">
      <description summary="name of this output">
        Many compositors will assign user-friendly names to their outputs, show
        them to the user, allow the user to refer to an output, etc. The client
        may wish to know this name as well to offer the user similar behaviors.

        The name is a UTF-8 string with no convention defined for its contents.
        Each name is unique among all wl_output globals. The name is only
        guaranteed to be unique for the compositor instance.

        The same output name is used for all clients for a given wl_output
        global. Thus, the name can be shared across processes to refer to a
        specific wl_output global.

        The name is not guaranteed to be persistent across sessions, thus cannot
        be used to reliably identify an output in e.g. configuration files.

        Examples of names include 'HDMI-A-1', 'WL-1', 'X11-1', etc. However, do
        not assume that the name is a reflection of an underlying DRM connector,
        X11 connection, etc.

        The name event is sent after binding the output object. This event is
        only sent once per output object, and the name does not change over the
        lifetime of the wl_output global.

        Compositors may re-use the same output name if the wl_output global is
        destroyed and re-created later. Compositors should avoid re-using the
        same name if possible.

        The name event will be followed by a done event.
      </description>
      <arg name="name" type="string" summary="output name"/>
    </event>

    <event name="description" since="4">
      <description summary="human-readable description of this output">
        Many compositors can produce human-readable descriptions of their
        outputs. The client may wish to know this description as well, e.g. for
        output selection purposes.

        The description is a UTF-8 string with no convention defined for its
        contents. The description is not guaranteed to be unique among all
        wl_output globals. Examples might include 'Foocorp 11" Display' or
        'Virtual X11 output via :1'.

        The description event is sent after binding the output object and
        whenever the description changes. The description is optional, and may
        not be sent at all.

        The description event will be followed by a done event.
      </description>
      <arg name="description" type="string" summary="output description"/>
    </event>
  </interface>

  <interface name="wl_region" version="7">
    <description summary="region interface">
      A region object describes an area.

      Region objects are used to describe the opaque and input
      regions of a surface.
    </description>

    <request name="destroy" type="destructor">
      <description summary="destroy region">
        Destroy the region.  This will invalidate the object ID.
      </description>
    </request>

    <request name="add">
      <description summary="add rectangle to region">
        Add the specified rectangle to the region.
      </description>
      <arg name="x" type="int" summary="region-local x coordinate"/>
      <arg name="y" type="int" summary="region-local y coordinate"/>
      <arg name="width" type="int" summary="rectangle width"/>
      <arg name="height" type="int" summary="rectangle height"/>
    </request>

    <request name="subtract">
      <description summary="subtract rectangle from region">
        Subtract the specified rectangle from the region.
      </description>
      <arg name="x" type="int" summary="region-local x coordinate"/>
      <arg name="y" type="int" summary="region-local y coordinate"/>
      <arg name="width" type="int" summary="rectangle width"/>
      <arg name="height" type="int" summary="rectangle height"/>
    </request>
  </interface>

  <interface name="wl_subcompositor" version="1">
    <description summary="sub-surface compositing">
      The global interface exposing sub-surface compositing capabilities.
      A wl_surface, that has sub-surfaces associated, is called the
      parent surface. Sub-surfaces can be arbitrarily nested and create
      a tree of sub-surfaces.

      The root surface in a tree of sub-surfaces is the main
      surface. The main surface cannot be a sub-surface, because
      sub-surfaces must always have a parent.

      A main surface with its sub-surfaces forms a (compound) window.
      For window management purposes, this set of wl_surface objects is
      to be considered as a single window, and it should also behave as
      such.

      The aim of sub-surfaces is to offload some of the compositing work
      within a window from clients to the compositor. A prime example is
      a video player with decorations and video in separate wl_surface
      objects. This should allow the compositor to pass YUV video buffer
      processing to dedicated overlay hardware when possible.
    </description>

    <request name="destroy" type="destructor">
      <description summary="unbind from the subcompositor interface">
        Informs the server that the client will not be using this
        protocol object anymore. This does not affect any other
        objects, wl_subsurface objects included.
      </description>
    </request>

    <enum name="error">
      <entry name="bad_surface" value="0"
             summary="the to-be sub-surface is invalid"/>
      <entry name="bad_parent" value="1"
             summary="the to-be sub-surface parent is invalid"/>
    </enum>

    <request name="get_subsurface">
      <description summary="give a surface the role sub-surface">
        Create a sub-surface interface for the given surface, and
        associate it with the given parent surface. This turns a
        plain wl_surface into a sub-surface.

        The to-be sub-surface must not already have another role, and it
        must not have an existing wl_subsurface object. Otherwise the
        bad_surface protocol error is raised.

        Adding sub-surfaces to a parent is a double-buffered operation on the
        parent (see wl_surface.commit). The effect of adding a sub-surface
        becomes visible on the next time the state of the parent surface is
        applied.

        The parent surface must not be one of the child surface's descendants,
        and the parent must be different from the child surface, otherwise the
        bad_parent protocol error is raised.

        This request modifies the behaviour of wl_surface.commit request on
        the sub-surface, see the documentation on wl_subsurface interface.
      </description>
      <arg name="id" type="new_id" interface="wl_subsurface"
           summary="the new sub-surface object ID"/>
      <arg name="surface" type="object" interface="wl_surface"
           summary="the surface to be turned into a sub-surface"/>
      <arg name="parent" type="object" interface="wl_surface"
           summary="the parent surface"/>
    </request>
  </interface>

  <interface name="wl_subsurface" version="1">
    <description summary="sub-surface interface to a wl_surface">
      An additional interface to a wl_surface object, which has been
      made a sub-surface. A sub-surface has one parent surface. A
      sub-surface's size and position are not limited to that of the parent.
      Particularly, a sub-surface is not automatically clipped to its
      parent's area.

      A sub-surface becomes mapped, when a non-NULL wl_buffer is applied
      and the parent surface is mapped. The order of which one happens
      first is irrelevant. A sub-surface is hidden if the parent becomes
      hidden, or if a NULL wl_buffer is applied. These rules apply
      recursively through the tree of surfaces.

      A sub-surface can be in one of two modes. The possible modes are
      synchronized and desynchronized, see methods wl_subsurface.set_sync and
      wl_subsurface.set_desync.

      The main surface can be thought to be always in desynchronized mode,
      since it does not have a parent in the sub-surfaces sense.

      Even if a sub-surface is in desynchronized mode, it will behave as
      in synchronized mode, if its parent surface behaves as in
      synchronized mode. This rule is applied recursively throughout the
      tree of surfaces. This means, that one can set a sub-surface into
      synchronized mode, and then assume that all its child and grand-child
      sub-surfaces are synchronized, too, without explicitly setting them.

      If a surface behaves as in synchronized mode, it is effectively
      synchronized, otherwise it is effectively desynchronized.

      A sub-surface is initially in the synchronized mode.

      The wl_subsurface interface has requests which modify double-buffered
      state of the parent surface (wl_subsurface.set_position, .place_above and
      .place_below).

      Destroying a sub-surface takes effect immediately. If you need to
      synchronize the removal of a sub-surface to the parent surface update,
      unmap the sub-surface first by attaching a NULL wl_buffer, update parent,
      and then destroy the sub-surface.

      If the parent wl_surface object is destroyed, the sub-surface is
      unmapped.

      A sub-surface never has the keyboard focus of any seat.

      The wl_surface.offset request is ignored: clients must use set_position
      instead to move the sub-surface.
    </description>

    <request name="destroy" type="destructor">
      <description summary="remove sub-surface interface">
        The sub-surface interface is removed from the wl_surface object
        that was turned into a sub-surface with a
        wl_subcompositor.get_subsurface request. The wl_surface's association
        to the parent is deleted. The wl_surface is unmapped immediately.
      </description>
    </request>

    <enum name="error">
      <entry name="bad_surface" value="0"
             summary="wl_surface is not a sibling or the parent"/>
    </enum>

    <request name="set_position">
      <description summary="reposition the sub-surface">
        This sets the position of the sub-surface, relative to the parent
        surface.

        The sub-surface will be moved so that its origin (top left
        corner pixel) will be at the location x, y of the parent surface
        coordinate system. The coordinates are not restricted to the parent
        surface area. Negative values are allowed.

        The initial position is 0, 0.

        Position is double-buffered state on the parent surface, see
        wl_subsurface and wl_surface.commit for more information.
      </description>
      <arg name="x" type="int" summary="x coordinate in the parent surface"/>
      <arg name="y" type="int" summary="y coordinate in the parent surface"/>
    </request>

    <request name="place_above">
      <description summary="restack the sub-surface">
        This sub-surface is taken from the stack, and put back just
        above the reference surface, changing the z-order of the sub-surfaces.
        The reference surface must be one of the sibling surfaces, or the
        parent surface. Using any other surface, including this sub-surface,
        will cause a protocol error.

        A new sub-surface is initially added as the top-most in the stack
        of its siblings and parent.

        Z-order is double-buffered state on the parent surface, see
        wl_subsurface and wl_surface.commit for more information.
      </description>
      <arg name="sibling" type="object" interface="wl_surface"
           summary="the reference surface"/>
    </request>

    <request name="place_below">
      <description summary="restack the sub-surface">
        The sub-surface is placed just below the reference surface.

        See wl_subsurface.place_above.
      </description>
      <arg name="sibling" type="object" interface="wl_surface"
           summary="the reference surface"/>
    </request>

    <request name="set_sync">
      <description summary="set sub-surface to synchronized mode">
        Change the commit behaviour of the sub-surface to synchronized
        mode.

        See wl_subsurface and wl_surface.commit for more information.
      </description>
    </request>

    <request name="set_desync">
      <description summary="set sub-surface to desynchronized mode">
        Change the commit behaviour of the sub-surface to desynchronized
        mode.

        See wl_subsurface and wl_surface.commit for more information.
      </description>
    </request>
  </interface>

  <interface name="wl_fixes" version="2">
    <description summary="wayland protocol fixes">
      This global fixes problems with other core-protocol interfaces that
      cannot be fixed in these interfaces themselves.
    </description>

    <enum name="error">
      <description summary="wl_fixes error values">
        These errors can be emitted in response to wl_fixes requests.
      </description>
      <entry name="invalid_ack_remove" value="0"
             summary="unknown global or the global is not removed"/>
    </enum>

    <request name="destroy" type="destructor">
      <description summary="destroys this object"/>
    </request>

    <request name="destroy_registry">
      <description summary="destroy a wl_registry">
        This request destroys a wl_registry object.

        The client should no longer use the wl_registry after making this
        request.

        The compositor will emit a wl_display.delete_id event with the object ID
        of the registry and will no longer emit any events on the registry. The
        client should re-use the object ID once it receives the
        wl_display.delete_id event.
      </description>
      <arg name="registry" type="object" interface="wl_registry"
           summary="the registry to destroy"/>
    </request>

    <request name="ack_global_remove" since="2">
      <description summary="acknowledge global removal">
        Acknowledge the removal of the specified global.

        If no global with the specified name exists or the global is not removed,
        the wl_fixes.invalid_ack_remove protocol error will be posted.

        Due to the Wayland protocol being asynchronous, the wl_global objects
        cannot be destroyed immediately. For example, if a wl_global is removed
        and a client attempts to bind that global around same time, it can
        result in a protocol error due to an unknown global name in the bind
        request.

        In order to avoid crashing clients, the compositor should remove the
        wl_global once it is guaranteed that no more bind requests will come.

        The wl_fixes.ack_global_remove() request is used to signal to the
        compositor that the client will not bind the given global anymore. After
        all clients acknowledge the removal of the global, the compositor can
        safely destroy it.

        The client must call the wl_fixes.ack_global_remove() request in
        response to a wl_registry.global_remove() event even if it did not bind
        the corresponding global.
      </description>
      <arg name="registry" type="object" interface="wl_registry"
           summary="the registry object"/>
      <arg name="name" type="uint" summary="unique name of the global"/>
    </request>
  </interface>

</protocol>
