diff --git a/protocols/wayland.xml b/protocols/wayland.xml new file mode 100644 index 0000000000000000000000000000000000000000..471daf668e388b9dee24c39e87d06683435cddaa --- /dev/null +++ b/protocols/wayland.xml @@ -0,0 +1,2892 @@ +<?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"> + <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="4"> + <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. + </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. + + At connection setup time, the wl_shm object emits one or more + format events 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. + </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"/> + </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_drm, wl_shm 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. + </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 + data_offer is valid until a new data_offer or NULL is received + or until the client loses keyboard focus. 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> + + <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> + </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. + </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="4"> + <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. + + 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"/> + </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. + + 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. Alternatively, a client could create multiple wl_buffer objects + from the same backing storage or use wp_linux_buffer_release. + + Destroying the wl_buffer after wl_buffer.release does not change + the surface contents. However, if the client destroys the + wl_buffer before receiving the wl_buffer.release event, 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. + </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 current state in use by the compositor. A commit + request atomically applies all pending state, replacing the current + state. After commit, the new pending state is as documented for each + related request. + + On commit, a pending wl_buffer is applied first, and all other state + second. This means that all coordinates in double-buffered state are + relative to the new wl_buffer coming into use, except for + wl_surface.attach itself. If there is no pending wl_buffer, the + coordinates are relative to the current surface contents. + + 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. + </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 an optional transformation on how the compositor + interprets the contents of the buffer attached to the surface. The + accepted values for the transform parameter are the values for + wl_output.transform. + + 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 positive the invalid_scale protocol error is + raised. + </description> + <arg name="scale" type="int" + summary="positive 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> + </interface> + + <interface name="wl_seat" version="7"> + <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 emitted 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 multiseat configuration this can be used by the client to help + identify which physical devices the seat represents. Based on + the seat configuration used by the compositor. + </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="7"> + <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 surface.attach requests to the pointer surface, hotspot_x + and hotspot_y are decremented by the x and y parameters + passed to the request. Attach must be confirmed 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 current and pending input regions of the wl_surface are + cleared, and wl_surface.set_input_region is ignored until the + wl_surface is no longer used as the cursor. When the use as a + cursor ends, the current and pending input regions become + undefined, and the wl_surface is unmapped. + </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 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"> + <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 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. + + 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> + </interface> + + <interface name="wl_keyboard" version="7"> + <description summary="keyboard input device"> + The wl_keyboard interface represents one or more keyboards + associated with a seat. + </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; 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 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. + </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 currently pressed keys"/> + </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. + + After this event client must assume that all keys, including modifiers, + are lifted and also it must stop key repeating if there's some going on. + </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. + </description> + <entry name="released" value="0" summary="key is not pressed"/> + <entry name="pressed" value="1" summary="key is pressed"/> + </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. + </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. + </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="7"> + <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. + </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.move. + + 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="3"> + <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="transform from framebuffer to output"> + This describes the transform that a compositor will apply to a + surface to compensate for the rotation or mirroring of an + output device. + + 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). + + 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 xdg_output.name and xdg_output.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="transform that maps framebuffer to output"/> + </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). + + 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. 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. + + It is intended that scaling aware clients track the + current output of a surface, and if it is on a scaled + output it should use wl_surface.set_buffer_scale with + the scale of the output. That way the compositor can + avoid scaling the surface, and the client can supply + a higher detail image. + </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> + </interface> + + <interface name="wl_region" version="1"> + <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"/> + </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 a 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. + + 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. + + The behaviour of a wl_surface.commit request on a sub-surface + depends on the sub-surface's mode. The possible modes are + synchronized and desynchronized, see methods + wl_subsurface.set_sync and wl_subsurface.set_desync. Synchronized + mode caches the wl_surface state to be applied when the parent's + state gets applied, and desynchronized mode applies the pending + wl_surface state directly. A sub-surface is initially in the + synchronized mode. + + Sub-surfaces also have another kind of state, which is managed by + wl_subsurface requests, as opposed to wl_surface requests. This + state includes the sub-surface position relative to the parent + surface (wl_subsurface.set_position), and the stacking order of + the parent and its sub-surfaces (wl_subsurface.place_above and + .place_below). This state is applied when the parent surface's + wl_surface state is applied, regardless of the sub-surface's mode. + As the exception, set_sync and set_desync are effective immediately. + + 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 the wl_surface associated with the wl_subsurface is destroyed, the + wl_subsurface object becomes inert. Note, that destroying either object + 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. + </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, and the wl_surface loses its role as + a sub-surface. 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 schedules a sub-surface position change. + 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 scheduled coordinates will take effect whenever the state of the + parent surface is applied. When this happens depends on whether the + parent surface is in synchronized mode or not. See + wl_subsurface.set_sync and wl_subsurface.set_desync for details. + + If more than one set_position request is invoked by the client before + the commit of the parent surface, the position of a new request always + replaces the scheduled position from any previous request. + + The initial position is 0, 0. + </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. + + The z-order is double-buffered. Requests are handled in order and + applied immediately to a pending state. The final pending state is + copied to the active state the next time the state of the parent + surface is applied. When this happens depends on whether the parent + surface is in synchronized mode or not. See wl_subsurface.set_sync and + wl_subsurface.set_desync for details. + + A new sub-surface is initially added as the top-most in the stack + of its siblings and parent. + </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, also described as the parent dependent mode. + + In synchronized mode, wl_surface.commit on a sub-surface will + accumulate the committed state in a cache, but the state will + not be applied and hence will not change the compositor output. + The cached state is applied to the sub-surface immediately after + the parent surface's state is applied. This ensures atomic + updates of the parent and all its synchronized sub-surfaces. + Applying the cached state will invalidate the cache, so further + parent surface commits do not (re-)apply old state. + + See wl_subsurface for the recursive effect of this mode. + </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, also described as independent or freely running mode. + + In desynchronized mode, wl_surface.commit on a sub-surface will + apply the pending state directly, without caching, as happens + normally with a wl_surface. Calling wl_surface.commit on the + parent surface has no effect on the sub-surface's wl_surface + state. This mode allows a sub-surface to be updated on its own. + + If cached state exists when wl_surface.commit is called in + desynchronized mode, the pending state is added to the cached + state, and applied as a whole. This invalidates the cache. + + Note: even if a sub-surface is set to desynchronized, a parent + sub-surface may override it to behave as synchronized. For details, + see wl_subsurface. + + If a surface's parent surface behaves as desynchronized, then + the cached state is applied on set_desync. + </description> + </request> + </interface> + +</protocol>