path: root/protocol/wayland.xml

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

  <!-- The core global object. This is a special singleton object.
       It is used for internal wayland protocol features. -->
  <interface name="wl_display" version="1">
    <request name="bind">
      <arg name="id" type="uint"/>
      <arg name="interface" type="string"/>
      <arg name="version" type="uint"/>
    </request>

    <!-- sync is an just an echo, which will reply with a sync event.
         Since requests are handled in-order, this can be used as a
         barrier to ensure all previous requests have ben handled.
         The key argument can be used to correlate between multiple
         sync invocations. -->
    <request name="sync">
      <arg name="key" type="uint"/>
    </request>

    <!-- Request notification when the next frame is displayed.
         Useful for throttling redrawing operations, and driving
         animations.  The notification will only be posted for one
         frame unless requested again. -->
    <request name="frame">
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="key" type="uint"/>
    </request>

    <!-- A request addressed a non-existent object id. This is
         tyipcally a fatal error. -->
    <event name="invalid_object">
      <arg name="object_id" type="uint"/>
    </event>

    <!-- A request tried to invoke an opcode out of range.  This is
         typically a fatal error. -->
    <event name="invalid_method">
      <arg name="object_id" type="uint"/>
      <arg name="opcode" type="uint"/>
    </event>

    <!-- A request has failed due to an out of memory error. -->
    <event name="no_memory"/>

    <!-- Notify the client of global objects. These are objects that
         are created by the server. Globals are published on the
         initial client connection sequence, upon device hotplugs,
         device disconnects, reconfiguration or other events.  The
         server will always announce an object before the object sends
         out events. -->
    <event name="global">
      <arg name="id" type="new_id" interface="wl_object"/>
      <arg name="name" type="string"/>
      <arg name="version" type="uint"/>
    </event>

    <!-- Internal, deprecated, and will be changed.  This is an object
         IDs range that is used by the client to allocate object IDs
         in "new_id" type arguments.  The server sends range
         allocations to the client before the next range is about to
         be depleted. -->
    <event name="range">
      <arg name="base" type="uint"/>
    </event>

    <!-- A reply to the frame or sync request.  The key is the one
         used in the request.  time is in millisecond units, and
         denotes the time when the frame was posted on the
         display. time can be used to estimaate frame rate, determine
         how much to advance animations and compensate for jitter. -->
    <event name="key">
      <arg name="key" type="uint"/>
      <arg name="time" type="uint"/>
    </event>
  </interface>


  <!-- A compositor. This object is a global.  The compositor is in
       charge of combining the contents of multiple surfaces into one
       displayable output. -->
  <interface name="wl_compositor" version="1">
    <!-- Factory request for a surface objects. A surface is akin to a
         window. -->
    <request name="create_surface">
      <arg name="id" type="new_id" interface="wl_surface"/>
    </request>
  </interface>


  <!-- Shared memory support -->
  <interface name="wl_shm" version="1">
    <!-- Transfer a shm buffer to the server.  The allocated buffer
         would include at least stride * height bytes starting at the
         beginning of fd.  The file descriptor is transferred over the
         socket using AF_UNIX magical features. width, height, stride
         and visual describe the respective properties of the pixel
         data contained in the buffer. -->
    <request name="create_buffer">
      <arg name="id" type="new_id" interface="wl_buffer"/>
      <arg name="fd" type="fd"/>
      <arg name="width" type="int"/>
      <arg name="height" type="int"/>
      <arg name="stride" type="uint"/>
      <arg name="visual" type="object" interface="wl_visual"/>
    </request>
  </interface>


  <!-- A pixel buffer. Created using the drm, shm or similar objects.
       It has a size, visual and contents, but not a location on the
       screen. -->
  <interface name="wl_buffer" version="1">
    <!-- Notify the server that the specified area of the buffers
         contents have changed.  To describe a more complicated area
         of damage, break down the region into rectangles and use this
         request several times.
    -->
    <request name="damage">
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="width" type="int"/>
      <arg name="height" type="int"/>
    </request>

    <!-- Destroy a buffer.  This will invalidate the object id. -->
    <request name="destroy" type="destructor"/>
  </interface>

  <interface name="wl_shell" version="1">
    <request name="move">
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="input_device" type="object" interface="wl_input_device"/>
      <arg name="time" type="uint"/>
    </request>

    <enum name="resize">
      <entry name="none" value="0"/>
      <entry name="top" value="1"/>
      <entry name="bottom" value="2"/>
      <entry name="left" value="4"/>
      <entry name="top_left" value="5"/>
      <entry name="bottom_left" value="6"/>
      <entry name="right" value="8"/>
      <entry name="top_right" value="9"/>
      <entry name="bottom_right" value="10"/>
    </enum>

    <request name="resize">
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="input_device" type="object" interface="wl_input_device"/>
      <arg name="time" type="uint"/>
      <!-- edges is an enum, need to get the values in here -->
      <arg name="edges" type="uint"/>
    </request>

    <request name="create_drag">
      <arg name="id" type="new_id" interface="wl_drag"/>
    </request>

    <request name="create_selection">
      <arg name="id" type="new_id" interface="wl_selection"/>
    </request>

    <!-- 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 ration or resize in steps of NxM pixels).  The
         client is free to dismiss all but the last configure event it
         received. -->
    <event name="configure">
      <arg name="time" type="uint"/>
      <arg name="edges" type="uint"/>
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="width" type="int"/>
      <arg name="height" type="int"/>
    </event>
  </interface>

  <interface name="wl_selection" version="1">
    <!-- Add an offered mime type.  Can be called several times to
         offer multiple types, but must be called before 'activate'. -->
    <request name="offer">
      <arg name="type" type="string"/>
    </request>

    <!-- Can the selection be activated for multiple devices? -->
    <request name="activate">
      <arg name="input_device" type="object" interface="wl_input_device"/>
      <arg name="time" type="uint"/>
    </request>

    <!-- Destroy the selection. -->
    <request name="destroy" type="destructor"/>

    <!-- Another client pasted the selection, send the mime-type over
         the passed fd. -->
    <event name="send">
      <arg name="mime_type" type="string"/>
      <arg name="fd" type="fd"/>
    </event>

    <!-- Another selection became active. -->
    <event name="cancelled"/>
  </interface>

  <interface name="wl_selection_offer" version="1">
    <!-- Called to receive the selection data as the specified type.
         Sends the pipe fd to the compositor, which forwards it to the
         source in the 'send' event -->
    <request name="receive">
      <arg name="mime_type" type="string"/>
      <arg name="fd" type="fd"/>
    </request>

    <!-- Sent before the keyboard_focus event to announce the types
         offered.  One event per offered mime type.  A mime type of
         NULL means the selection offer is going away.  -->
    <event name="offer">
      <arg name="type" type="string"/>
    </event>

    <event name="keyboard_focus">
      <arg name="input_device" type="object" interface="wl_input_device"/>
    </event>
  </interface>

  <interface name="wl_drag" version="1">
    <!-- Add an offered mime type.  Can be called several times to
         offer multiple types, but must be called before 'activate'. -->
    <request name="offer">
      <arg name="type" type="string"/>
    </request>

    <request name="activate">
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="input_device" type="object" interface="wl_input_device"/>
      <arg name="time" type="uint"/>
    </request>

    <!-- Destroy the drag and cancel the session. -->
    <request name="destroy" type="destructor"/>

    <!-- Sent when a target accepts pointer_focus or motion events.
         If a target does not accept any of the offered types, type is
         NULL -->
    <event name="target">
      <arg name="mime_type" type="string"/>
    </event>

    <!-- Sent when the drag is finished.  The final mime type is that
         of the last target event.  If that was NULL, no drag target
         was valid when the drag finished, fd is undefined and the
         source should not send data.  The event is also sent in case
         a drag source tries to activate a drag after the grab was
         released, in which case mime_type will also be NULL. -->
    <event name="finish">
      <arg name="fd" type="fd"/>
    </event>

    <event name="reject"/>
  </interface>


  <interface name="wl_drag_offer" version="1">
    <!-- Call to accept the offer of the given type -->
    <request name="accept">
      <arg name="time" type="uint"/>
      <arg name="type" type="string"/>
    </request>

    <!-- Called to initiate the drag finish sequence.  Sends the pipe
         fd to the compositor, which forwards it to the source in the
         'finish' event -->
    <request name="receive">
      <arg name="fd" type="fd"/>
    </request>

    <!-- Called to reject a drop  -->
    <request name="reject"/>

    <!-- Sent before the pointer_focus event to announce the types
         offered.  One event per offered mime type. -->
    <event name="offer">
      <arg name="type" type="string"/>
    </event>

    <!-- Similar to device::pointer_focus.  Sent to potential target
         surfaces to offer drag data.  If the device leaves the
         window, the drag stops or the originator cancels the drag,
         this event is sent with the NULL surface, at which point the
         drag object may no longer be valid. -->
    <event name="pointer_focus">
      <arg name="time" type="uint"/>
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="surface_x" type="int"/>
      <arg name="surface_y" type="int"/>
    </event>

    <!-- Similar to device::motion.  Sent to potential target surfaces
         as the drag pointer moves around in the surface. -->
    <event name="motion">
      <arg name="time" type="uint"/>
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="surface_x" type="int"/>
      <arg name="surface_y" type="int"/>
    </event>

    <!-- Sent to indicate that the drag is finishing.  The last
         motion/pointer_focus event gives the location of the drop.
         Target must respond with the 'receive' request, which sends
         an fd to the source for writing the drag data. -->
    <event name="drop"/>
  </interface>


  <!-- A surface. This is an image that is displayed on the screen.
       It has a location, size and pixel contents. Similar to a window. -->
  <interface name="wl_surface" version="1">
    <!-- Deletes the surface and invalidates its object id. -->
    <request name="destroy" type="destructor"/>

    <!-- Copy the contents of a buffer into this surface. The x and y
         arguments specify the location of the new buffers upper left
         corner, relative to the old buffers upper left corner. -->
    <request name="attach">
      <arg name="buffer" type="object" interface="wl_buffer"/>
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
    </request>

    <!-- Make the surface visible as a toplevel window. -->
    <request name="map_toplevel"/>

    <!-- Map the surface relative to an existing surface. The x and y
         arguments specify the locations of the upper left corner of
         the surface relative to the upper left corner of the parent
         surface.  The flags argument controls overflow/clipping
         behaviour when the surface would intersect a screen edge,
         panel or such.  And possibly whether the offset only
         determines the initial position or if the surface is locked
         to that relative position during moves. -->
    <request name="map_transient">
      <arg name="parent" type="object" interface="wl_surface"/>
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="flags" type="uint"/>
    </request>

    <!-- Map the surface as a fullscreen surface.  There are a number
         of options here: on which output? if the surface size doesn't
         match the output size, do we scale, change resolution, or add
         black borders? is that something the client controls?  what
         about transient surfaces, do they float on top of the
         fullscreen? what if there's already a fullscreen surface on
         the output, maybe you can only go fullscreen if you're
         active?  -->
    <request name="map_fullscreen"/>

    <!-- After attaching a new buffer, this request is used to
         describe the regions where the new buffer is different from
         the previous buffer and needs to be repainted.  Coordinates
         are relative to the new buffer. -->
    <request name="damage">
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="width" type="int"/>
      <arg name="height" type="int"/>
    </request>
  </interface>


  <!-- A group of keyboards and pointer devices (mice, for
       example). This object is published as a global during start up,
       or when such a device is hot plugged.  A input_device group
       typically has a pointer and maintains a keyboard_focus and a
       pointer_focus.  -->
  <interface name="wl_input_device" version="1">
    <!-- Set the pointer's image.  This request only takes effect if
         the pointer focus for this device is one of the requesting
         clients surfaces.  -->
    <request name="attach">
      <arg name="time" type="uint"/>
      <arg name="buffer" type="object" interface="wl_buffer"/>
      <arg name="hotspot_x" type="int"/>
      <arg name="hotspot_y" type="int"/>
    </request>

    <!-- Notification of pointer location change.
         x,y are the absolute location on the screen.
         surface_[xy] are the location relative to the focused surface. -->
    <event name="motion">
      <arg name="time" type="uint"/>
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="surface_x" type="int"/>
      <arg name="surface_y" type="int"/>
    </event>

    <!-- Mouse button click and release notifications.  The location
         of the click is given by the last motion or pointer_focus
         event. -->
    <event name="button">
      <arg name="time" type="uint"/>
      <arg name="button" type="uint"/>
      <arg name="state" type="uint"/>
    </event>

    <!-- Keyboard press. -->
    <event name="key">
      <arg name="time" type="uint"/>
      <arg name="key" type="uint"/>
      <arg name="state" type="uint"/>
    </event>

    <!-- Notification that this input device's pointer is focused on
         certain surface. When an input_device enters a surface, the
         pointer image is undefined and a client should respond to
         this event by setting an apropriate pointer image. -->
    <event name="pointer_focus">
      <arg name="time" type="uint"/>
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="surface_x" type="int"/>
      <arg name="surface_y" type="int"/>
    </event>

    <event name="keyboard_focus">
      <arg name="time" type="uint"/>
      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="keys" type="array"/>
    </event>
  </interface>


  <!-- An output describes part of the compositor geometry.  The
       compositor work in the 'compositor coordinate system' and an
       output corresponds to 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 screen is hot
       plugged.  -->
  <interface name="wl_output" version="1">
    <!-- Notification about the screen size. -->
    <event name="geometry">
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="width" type="int"/>
      <arg name="height" type="int"/>
    </event>
  </interface>


  <!-- A visual is the pixel format.  The different visuals are
       currently only identified by the order they are advertised by
       the 'global' events.  We need something better.  -->
  <interface name="wl_visual" version="1"/>

</protocol>