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<?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 the event serial.
</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 a client deletes an object that it had created,
the server will send this event to acknowledge that it has
seen the delete request. When the client receives this event,
it will know that it can safely 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="bounded 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">
<description summary="callback object">
Clients can handle the 'done' event to get notified when
the related request is done.
</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="5">
<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>
</interface>
<interface name="wl_shm_pool" version="1">
<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>
<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="1">
<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">
<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"/>
<entry name="invalid_stride" value="1" summary="invalid size or stride during pool or buffer 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.
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 RBGA 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"/>
</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.
</description>
<arg name="format" type="uint" enum="format" summary="buffer pixel format"/>
</event>
</interface>
<interface name="wl_buffer" version="1">
<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.
If the buffer uses a format that has an alpha channel, the alpha channel
is assumed to be premultiplied in the color channels unless otherwise
specified.
</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.
The client is now free to reuse or destroy this buffer and its
backing storage.
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="3">
<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 right after wl_data_device.enter, 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="3">
<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 however 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_offer.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="3">
<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"/>
</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.attach request 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 current and pending input regions of the icon wl_surface are
cleared, and wl_surface.set_input_region is ignored until the
wl_surface is no longer used as the icon surface. When the use
as an icon ends, the current and pending input regions become
undefined, and the wl_surface is unmapped.
</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.
</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< 51A1 /div>
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="3">
<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>
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