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,
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and to permit persons to whom the Software is furnished to do so,
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The above copyright notice and this permission notice (including the
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SOFTWARE.
The core global object. This is a special singleton object. It
is used for internal Wayland protocol features.
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.
This request creates a registry object that allows the client
to list and bind the global objects available from the
compositor.
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.
These errors are global and can be emitted in response to any
server request.
This event is used internally by the object ID management
logic. When a client deletes an object, 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.
The 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.
Binds a new, client-created object to the server using the
specified name as the identifier.
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.
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.
Clients can handle the 'done' event to get notified when
the related request is done.
Notify the client when the related request is done.
A compositor. This object is a singleton global. The
compositor is in charge of combining the contents of multiple
surfaces into one displayable output.
Ask the compositor to create a new surface.
Ask the compositor to create a new region.
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.
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.
Destroy the shared memory pool.
The mmapped memory will be released when all
buffers that have been created from this pool
are gone.
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.
A global singleton 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.
These errors can be emitted in response to wl_shm requests.
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.
The formats actually supported by the compositor will be
reported by the format event.
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.
Informs the client about a valid pixel format that
can be used for buffers. Known formats include
argb8888 and xrgb8888.
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.
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.
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.
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.
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.
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.
Destroy the data offer.
Sent immediately after creating the wl_data_offer object. One
event per offered mime type.
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.
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_drag_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.
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.
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.
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.
This request adds a mime type to the set of mime types
advertised to targets. Can be called several times to offer
multiple types.
Destroy the data source.
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.
Request for data from the client. Send the data as the
specified mime type over the passed file descriptor, then
close it.
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.
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.
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.
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.
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.
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.
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.
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.
This request asks the compositor to set the selection
to the data from the source on behalf of the client.
To unset the selection, set the source to NULL.
The 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.
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.
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.
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.
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.
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.
This request destroys the data device.
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.
Create a new data source.
Create a new data device for a given seat.
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").
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.
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.
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.
A client must respond to a ping event with a pong request or
the client may be deemed unresponsive.
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).
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.
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).
Map the surface as a toplevel surface.
A toplevel surface is not fullscreen, maximized or transient.
These flags specify details of the expected behaviour
of transient surfaces. Used in the set_transient request.
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.
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.
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.
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.
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.
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.
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.
Ping a client to check if it is receiving events and sending
requests. A client is expected to reply with a pong request.
The configure event asks the client to resize its surface.
The size is a hint, in the sense that the client is free to
ignore it if it doesn't resize, pick a smaller size (to
satisfy aspect 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.
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.
A surface is a rectangular area that is displayed on the screen.
It has a location, size and pixel contents.
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).
These errors can be emitted in response to wl_surface requests.
Deletes the surface and invalidates its object ID.
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 the supplied buffer
must be an integer multiple of the buffer_scale.
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.
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.
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.
Alternatively, damage can be posted with wl_surface.damage_buffer
which uses buffer coordinates instead of surface coordinates,
and is probably the preferred and intuitive way of doing this.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
This is a bitmask of capabilities this seat has; if a member is
set, then it is present on the seat.
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.
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 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 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.
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.
Using this request a client can tell the server that it is not going to
use the seat object anymore.
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.
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.
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.
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.
Notification of pointer location change. The arguments
surface_x and surface_y are the location relative to the
focused surface.
Describes the physical state of a button that produced the 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.
Describes the axis types of scroll events.
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.
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.
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.
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.
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 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.
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.
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.
The wl_keyboard interface represents one or more keyboards
associated with a seat.
This specifies the format of the keymap provided to the
client with the wl_keyboard.keymap event.
This event provides a file descriptor to the client which can be
memory-mapped to provide a keyboard mapping description.
Notification that this seat's keyboard focus is on a certain
surface.
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.
Describes the physical state of a key that produced the key event.
A key was pressed or released.
The time argument is a timestamp with millisecond
granularity, with an undefined base.
Notifies clients that the modifier and/or group state has
changed, and it should update its local state.
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.
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.
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.
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.
A touch point has changed coordinates.
Indicates the end of a contact point list.
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.
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.
This enumeration describes how the physical
pixels on an output are laid out.
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.
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.
These flags describe properties of an output mode.
They are used in the flags bitfield of the mode event.
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.
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.
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.
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.
Using this request a client can tell the server that it is not going to
use the output object anymore.
A region object describes an area.
Region objects are used to describe the opaque and input
regions of a surface.
Destroy the region. This will invalidate the object ID.
Add the specified rectangle to the region.
Subtract the specified rectangle from the region.
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.
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.
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.
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 have also other 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.
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.
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.
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.
The sub-surface is placed just below the reference surface.
See wl_subsurface.place_above.
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.
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.