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Merge branch 'wip/content-update-behavior' into 'main'

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protocol: Define Content Update behavior

See merge request wayland/wayland!396
This commit is contained in:
Sebastian Wick 2026-01-22 08:50:11 +00:00
commit fdd5e948b7
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<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % BOOK_ENTITIES SYSTEM "Wayland.ent">
%BOOK_ENTITIES;
]>
<chapter id="chap-Content-Updates">
<title>Content Updates</title>
<section id="sect-Content-Updates-preface">
<title>Overview</title>
<para>
In the Wayland protocol, requests are asynchronous but take effect
immediately when the compositor receives them. However, some requests on
surfaces are not applied immediately but are instead double-buffered to
allow atomic changes. These double-buffered changes are committed through
the wl_surface.commit request, which creates a Content Update.
</para>
<para>
Content Updates encapsulate all double-buffered state changes and can be
applied by the compositor. The complexity arises when considering
subsurfaces, which can operate in synchronized mode. When a subsurface is
synchronized, its Content Updates must be applied atomically together with
the parent surface's state. This synchronization can extend through an
entire tree of subsurfaces, where child subsurfaces inherit the
synchronized behavior from their parents.
</para>
<para>
Historically, Content Updates from synchronized subsurfaces were merged
into the pending state of the parent surface on commit. However, the
introduction of constraints—which can defer the application of Content
Updates—necessitated a more sophisticated model. This led to the
implementation of per-surface queues of Content Updates, with dependencies
between Content Updates across different queues. This queuing model
maintains backwards compatibility with the earlier approach of merging
Content Updates into the parent's pending state on commit.
</para>
<para>
The core protocol defines the semantics of Content Updates using
per-surface queues, but compositors that do not need to support constraints
may implement the simpler legacy model where synchronized subsurface states
are merged directly into the parent's pending state.
</para>
</section>
<section id="sect-Content-Updates-rules">
<title>Rules</title>
<para>
The core protocol specifies the behavior in wl_subsurface and
wl_surface.commit. The behavior can be summarized by the following rules:
</para>
<orderedlist numeration="arabic">
<listitem>
<para>
Content Updates (CU) contain all double-buffered state of the surface and
selected state from their direct children.
</para>
</listitem>
<listitem>
<para>
Surfaces which are effectively synchronized create Synchronized
Content Updates (SCU), otherwise they create Desync Content Updates
(DCU).
</para>
</listitem>
<listitem>
<para>
When a CU is created, it gets a dependency on the previous CU of the
same queues (if it exists).
</para>
</listitem>
<listitem>
<para>
When a CU is created, it gets a dependency on the last SCU of direct
child surfaces that are not reachable (if they exists).
</para>
</listitem>
<listitem>
<para>
The CUs and their dependencies form a DAG, where CUs are nodes and
dependencies are edges.
</para>
</listitem>
<listitem>
<para>
All DCUs starting from the front of the queues until the first SCU or
the back of the queue is reached are candidates.
</para>
</listitem>
<listitem>
<para>
If the maximal DAG that's reachable from a candidate (candidate DAG)
does not have any constraints, then this DAG can be applied.
</para>
</listitem>
<listitem>
<para>
A DAG is applied atomically by recursively applying a content update
without dependencies and removing it from the DAG.
</para>
</listitem>
<listitem>
<para>
Surfaces transition from effectively sync to effectively desync after
their parents.
</para>
</listitem>
<listitem>
<para>
When a surface transitions to effectively desync, all SCUs in its
queue which are not reachable by a DCU become DCUs.
</para>
</listitem>
</orderedlist>
</section>
<section id="sect-Content-Updates-examples">
<title>Examples</title>
<para>
These examples should help to build an intuition for how content updates
actually behave. They cover the interesting edge cases, such as
subsurfaces with constraints, and transitioning from a sync subsurface to
a desync one.
</para>
<para>
In all the examples below, the surface T1 refers to a toplevel surface,
SS1 refers to a sub-surface which is a child of T1, and SS2 refers to a
sub-surface which is a child of SS1.
</para>
<figure>
<title>Legend</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/content-update-legend.png"/>
</imageobject>
</mediaobject>
</figure>
<figure>
<title>Simple Desynchronized Case</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-desynchronized-state-1.png"/>
</imageobject>
<caption>
<para>
SS2 is effectively desynchronized and commits. This results in the
desynchronized content update (DCU) <emphasis>1</emphasis>.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-desynchronized-state-2.png"/>
</imageobject>
<caption>
<para>
DCU <emphasis>1</emphasis> is a candidate, and the candidate DAG
reachable from DCU <emphasis>1</emphasis> is only
DCU <emphasis>1</emphasis> itself. DCU <emphasis>1</emphasis> and
thus the candidate DAG does not have any constraints and can be
applied.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-desynchronized-state-3.png"/>
</imageobject>
<caption>
<para>
The content updates of the candidate DAG get applied to the surface
atomically.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-desynchronized-state-4.png"/>
</imageobject>
<caption>
<para>
T1 commits a DCU with a <emphasis>buffer-sync</emphasis> constraint.
It is a candidate but its DAG can't be applied because it contains a
constraint.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-desynchronized-state-5.png"/>
</imageobject>
<caption>
<para>
T1 commits another CU (DCU <emphasis>3</emphasis>) which is added at
the end of the queue, with a dependency to the previous CU (DCU
<emphasis>2</emphasis>). Both DCU <emphasis>2</emphasis> and DCU
<emphasis>3</emphasis> are candidates, but both DAGs contain DCU
<emphasis>2</emphasis> with a constraint, and can't be applied.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-desynchronized-state-6.png"/>
</imageobject>
<caption>
<para>
When the constraint gets cleared, both DAGs can be applied to the
surface atomitcally (either only <emphasis>2</emphasis>, or
<emphasis>2</emphasis> and <emphasis>3</emphasis>).
</para>
</caption>
</mediaobject>
</figure>
<figure>
<title>Simple Synchronized Case</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-synchronized-state-1.png"/>
</imageobject>
<caption>
<para>
SS1 and SS2 are effectively synchronized. SS2 commits SCU <emphasis>1</emphasis>.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-synchronized-state-2.png"/>
</imageobject>
<caption>
<para>
SS1 commits SCU <emphasis>2</emphasis>. The direct child surfaces SS2 has the last SCU <emphasis>1</emphasis> in its queue, which is not reachable. This creates a dependency from SCU <emphasis>2</emphasis> to SCU <emphasis>1</emphasis>.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-synchronized-state-3.png"/>
</imageobject>
<caption>
<para>
SS1 commits SCU <emphasis>3</emphasis>. The direct child surfaces SS2 has the last SCU <emphasis>1</emphasis> in its queue, which is already reachable by SCU <emphasis>2</emphasis>. No dependency to SCU <emphasis>1</emphasis> is created. A dependency to the previous CU of the same queue (SCU <emphasis>2</emphasis>) is created.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-synchronized-state-4.png"/>
</imageobject>
<caption>
<para>
T1 commit DCU <emphasis>4</emphasis>. It is a candidate, its DAG does not contain any constraint and it can be applied.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/simple-synchronized-state-5.png"/>
</imageobject>
<caption>
<para>
The DAG gets applied to the surfaces atomically.
</para>
</caption>
</mediaobject>
</figure>
<figure>
<title>Complex Synchronized Subsurface Case 1</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case1-1.png"/>
</imageobject>
<caption>
<para>
Every DCU (<emphasis>1</emphasis> and <emphasis>6</emphasis>) contain
CUs with constraints in their candidate DAG
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case1-2.png"/>
</imageobject>
<caption>
<para>
Waiting until the <emphasis>buffer-sync</emphasis> constrain on CU
<emphasis>1</emphasis> is cleared, the candidate DAG of CU
<emphasis>1</emphasis> does not contain constraints and can be applied
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case1-3.png"/>
</imageobject>
<caption>
<para>
That leaves the candidate DAG of CU <emphasis>6</emphasis> which still
contains another CU with a <emphasis>buffer-sync</emphasis> constrain
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case1-4.png"/>
</imageobject>
<caption>
<para>
Waiting until the <emphasis>buffer-sync</emphasis> constrain on CU
<emphasis>6</emphasis> is cleared, the candidate DAG of
<emphasis>6</emphasis> does not contain CUs with constraints and can
be applied.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case1-5.png"/>
</imageobject>
<caption>
<para>
There is no DCU left and no constraint remaining. Nothing more can be
applied without a new CU.
</para>
</caption>
</mediaobject>
</figure>
<figure>
<title>Complex Synchronized Subsurface Case 2</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case2-1.png"/>
</imageobject>
<caption>
<para>
Both DCUs (<emphasis>1</emphasis> and <emphasis>6</emphasis>) have a
reachable DAG containing CU <emphasis>1</emphasis> with a constraint
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case2-2.png"/>
</imageobject>
<caption>
<para>
Waiting until the <emphasis>buffer-sync</emphasis> constrain on
<emphasis>1</emphasis> is cleared, both DAGs contain no CU with
constraints and can be applied in any order
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-subsurf-case2-3.png"/>
</imageobject>
<caption>
<para>
That leaves the same state as in the previous case
</para>
</caption>
</mediaobject>
</figure>
<figure>
<title>Synchronized to Desynchronized Subsurface</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-to-desync-subsurf-1.png"/>
</imageobject>
<caption>
<para>
There is one DCU (<emphasis>4</emphasis>) with its reachable DAG
that cannot be applied because CU <emphasis>4</emphasis> contains a
constraint
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-to-desync-subsurf-2.png"/>
</imageobject>
<caption>
<para>
Surface <emphasis>SS1</emphasis> transitions from effectively
synchronized to effectively desynchronized. SCU
<emphasis>2</emphasis> is reachable by DCU <emphasis>4</emphasis> so
nothing changes.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-to-desync-subsurf-3.png"/>
</imageobject>
<caption>
<para>
Surface <emphasis>SS1</emphasis> provides a new DCU
(<emphasis>5</emphasis>) but because the CU before
(<emphasis>2</emphasis>) is a Synchronized CU, it is not a candidate
</para>
</caption>
</mediaobject>
</figure>
<figure>
<title>Synchronized to Desynchronized Transition</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-to-desync-transition-1.png"/>
</imageobject>
<caption>
<para>
There are four SCUs and all surfaces are effectively synchronized.
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-to-desync-transition-2.png"/>
</imageobject>
<caption>
<para>
Surface <emphasis>SS1</emphasis> transitions to effectively
desynchronized and SCU <emphasis>2</emphasis> becomes a DCU because
it is not reachable from a DCU
</para>
</caption>
</mediaobject>
<mediaobject>
<imageobject>
<imagedata fileref="images/content-updates/sync-to-desync-transition-3.png"/>
</imageobject>
<caption>
<para>
Surface <emphasis>SS2</emphasis> transitions to effectively
desynchronized. SCUs <emphasis>3</emphasis> and
<emphasis>4</emphasis> become DCUs because they are not reachable
from a DCU. SCU <emphasis>1</emphasis> does not change because it is
reachable by DCU <emphasis>2</emphasis>.
</para>
</caption>
</mediaobject>
</figure>
</section>
</chapter>

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<xi:include href="Architecture.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="Protocol.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="Xwayland.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="Content_Updates.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="Color.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="ProtocolSpec.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="Client.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>

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foreach src : files([
'simple-desynchronized-state-1.png',
'simple-desynchronized-state-2.png',
'simple-desynchronized-state-3.png',
'simple-desynchronized-state-4.png',
'simple-desynchronized-state-5.png',
'simple-desynchronized-state-6.png',
'simple-synchronized-state-1.png',
'simple-synchronized-state-2.png',
'simple-synchronized-state-3.png',
'simple-synchronized-state-4.png',
'simple-synchronized-state-5.png',
'sync-subsurf-case1-1.png',
'sync-subsurf-case1-2.png',
'sync-subsurf-case1-3.png',
'sync-subsurf-case1-4.png',
'sync-subsurf-case1-5.png',
'sync-subsurf-case2-1.png',
'sync-subsurf-case2-2.png',
'sync-subsurf-case2-3.png',
'sync-to-desync-subsurf-1.png',
'sync-to-desync-subsurf-2.png',
'sync-to-desync-subsurf-3.png',
'sync-to-desync-transition-1.png',
'sync-to-desync-transition-2.png',
'sync-to-desync-transition-3.png',
'content-update-legend.png',
])
name = fs.name(src)
publican_inputs += fs.copyfile(
name,
install: true,
install_dir: publican_install_prefix + '/html/images/content-updates',
)
endforeach

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2
doc/publican/html/images/meson.build
View file

@ -10,6 +10,8 @@ foreach src : files([
)
endforeach
subdir('content-updates')
foreach src : files([
'wayland-architecture.gv',
'x-architecture.gv',

1
doc/publican/meson.build
View file

@ -15,6 +15,7 @@ foreach src : files([
'Protocol.xml',
'Xwayland.xml',
'Compositors.xml',
'Content_Updates.xml',
'Color.xml',
'Client.xml',
'Server.xml',

133
protocol/wayland.xml
View file

@ -1687,21 +1687,48 @@
etc.) is double-buffered. Protocol requests modify the pending state,
as opposed to the active state in use by the compositor.
A commit request atomically creates a content update from the pending
state, even if the pending state has not been touched. The content
update is placed in a queue until it becomes active. After commit, the
new pending state is as documented for each related request.
When the content update is applied, the wl_buffer is applied before all
other state. This means that all coordinates in double-buffered state
are relative to the newly attached wl_buffers, except for
wl_surface.attach itself. If there is no newly attached wl_buffer, the
coordinates are relative to the previous content update.
All requests that need a commit to become effective are documented
to affect double-buffered state.
Other interfaces may add further double-buffered surface state.
A commit request atomically creates a Content Update (CU) from the
pending state, even if the pending state has not been touched. The
content update is placed at the end of a per-surface queue until it
becomes active. After commit, the new pending state is as documented for
each related request.
A CU is either a Desync Content Update (DCU) or a Sync Content Update
(SCU). If the surface is effectively synchronized at the commit request,
it is a SCU, otherwise a DCU.
When a surface transitions from effectively synchronized to effectively
desynchronized, all SCUs in its queue which are not reachable by any
DCU become DCUs and dependency edges from outside the queue to these CUs
are removed.
See wl_subsurface for the definition of 'effectively synchronized' and
'effectively desynchronized'.
When a CU is placed in the queue, the CU has a dependency on the CU in
front of it and to the SCU at end of the queue of every direct child
surface if that SCU exists and does not have another dependent. This can
form a directed acyclic graph of CUs with dependencies as edges.
In addition to surface state, the CU can have constraints that must be
satisfied before it can be applied. Other interfaces may add CU
constraints.
All DCUs which do not have a SCU in front of themselves in their queue,
are candidates. If the graph that's reachable by a candidate does not
have any unsatisfied constraints, the entire graph must be applied
atomically.
When a CU is applied, the wl_buffer is applied before all other state.
This means that all coordinates in double-buffered state are relative to
the newly attached wl_buffers, except for wl_surface.attach itself. If
there is no newly attached wl_buffer, the coordinates are relative to
the previous content update.
</description>
</request>
@ -3140,23 +3167,9 @@
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.
A sub-surface can be in one of two modes. The possible modes are
synchronized and desynchronized, see methods wl_subsurface.set_sync and
wl_subsurface.set_desync.
The main surface can be thought to be always in desynchronized mode,
since it does not have a parent in the sub-surfaces sense.
@ -3168,6 +3181,15 @@
synchronized mode, and then assume that all its child and grand-child
sub-surfaces are synchronized, too, without explicitly setting them.
If a surface behaves as in synchronized mode, it is effectively
synchronized, otherwise it is effectively desynchronized.
A sub-surface is initially in the synchronized mode.
The wl_subsurface interface has requests which modify double-buffered
state of the parent surface (wl_subsurface.set_position, .place_above and
.place_below).
Destroying a sub-surface takes effect immediately. If you need to
synchronize the removal of a sub-surface to the parent surface update,
unmap the sub-surface first by attaching a NULL wl_buffer, update parent,
@ -3198,20 +3220,18 @@
<request name="set_position">
<description summary="reposition the sub-surface">
This schedules a sub-surface position change.
This sets the position of the sub-surface, relative to the parent
surface.
The sub-surface will be moved so that its origin (top left
corner pixel) will be at the location x, y of the parent surface
coordinate system. The coordinates are not restricted to the parent
surface area. Negative values are allowed.
The scheduled coordinates will take effect whenever the state of the
parent surface is applied.
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.
Position is double-buffered state on the parent surface, see
wl_subsurface and wl_surface.commit for more information.
</description>
<arg name="x" type="int" summary="x coordinate in the parent surface"/>
<arg name="y" type="int" summary="y coordinate in the parent surface"/>
@ -3225,13 +3245,11 @@
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.
A new sub-surface is initially added as the top-most in the stack
of its siblings and parent.
Z-order is double-buffered state on the parent surface, see
wl_subsurface and wl_surface.commit for more information.
</description>
<arg name="sibling" type="object" interface="wl_surface"
summary="the reference surface"/>
@ -3240,6 +3258,7 @@
<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"
@ -3249,42 +3268,18 @@
<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.
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.
See wl_subsurface and wl_surface.commit for more information.
</description>
</request>
<request name="set_desync">
<description summary="set sub-surface to desynchronized mode">
Change the commit behaviour of the sub-surface to desynchronized
mode, also described as independent or freely running mode.
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.
See wl_subsurface and wl_surface.commit for more information.
</description>
</request>
</interface>