With the next commit, we'll need a list of all gestures that currently are
active globally. Since actors and actions (and therefore also gestures) in
Clutter are bound to a stage, it makes sense for this list to exist on the
ClutterStage level.
The list itself is a simple GPtrArray (to allow for quick searches) that
doesn't reference the gestures and is not manipulated by the stage itself.
All manipulation of the array is left to ClutterGestures.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2389>
Quite often there are situations where multiple gestures try to
recognize, keeping track of the same set of points (for example an edge
drag gesture on the stage and a click gesture somewhere in the
scenegraph). Usually what's wanted here is that the first gesture to
move to RECOGNIZING wins over all other active gestures and "claims" the
point for itself.
We implement this by introducing a concept called "influencing". It
works by making all gestures operating on a shared set of points aware
of each other using ClutterAction->register_sequence().
ClutterGesture uses this vfunc to keep track of all other
ClutterGestures that are potentially conflicting, and keeps a list
(priv->cancel_on_recognizing) of those. As soon as the move to
RECOGNIZING happens, all gestures inside this list get moved to
CANCELLED.
To allow fine-grained control over this behavior, two APIs are
introduced:
1) on the implementation level (should_influence() and
should_be_influenced_by()): This is a vfunc that gets called as soon as
a potential conflict is detected. It's helpful when a specific gesture
always behaves the same towards another gesture, for example to make
sure a LongPress gesture never cancels a DragGesture.
2) on the gesture user level, clutter_gesture_can_not_cancel() is
introduced: This allows control for the user of a gesture to specify
that a specific instance of a gesture won't cancel another gesture.
Calling this twice so that both gestures can't cancel each other allows
for things like simultaneous recognition of a pinch-to-zoom and rotate
gesture.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2389>
Introduce ClutterGesture, a new ClutterAction subclass and the successor
of ClutterGestureAction that brings the necessary tools to handle
sequences of events and abstract touch and mouse gestures from those.
The big difference compared to ClutterGestureAction is that ClutterGesture
provides the implementation with point_added/moved/ended and
sequences_cancelled events and expects the implementation to move the
ClutterGesture through the ClutterGestureState state machine. This state
machine is then used internally by ClutterGesture to coordinate with other
gestures.
With the next commits, ClutterGesture will handle relationships between
conflicting gestures completely by itself, allowing the implementation or
the user to specify the details of the relationship between two gestures.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2389>
clutter_event_get_source() is still valid for the case of crossing events,
just like clutter_event_get_related(). The latter is not deprecated, so the
former shouldn't be either.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2389>
ClutterStage will unref an action in the middle of its own event handler in
case the action causes its own actor to be destroyed. In this case the
action would get freed underneath our feet. To avoid it, take a ref on the
action while calling its handle_event() vfunc, just as we do in
clutter_actor_event() while emitting an event to an actor.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2389>
Since commit e30eb78891 `ClutterFrameClock` assumes that a valid CPU time
implies timestamp query support, which is also checked in
`cogl_onscreen_egl_swap_buffers_with_damage()`.
Unconditionally setting the CPU time on direct scanout meant that the
compositing path would be stuck on the last (direct scanout optimized)
result on GL implementations without timestamp query support since.
be0aa2976e (clutter/frame-clock: Avoid rapidly toggling dynamic max render time)
Fix that by explicitly marking the gpu rendering duration as valid when
querying the GPU timestamps is supported and check for it ClutterFrameClock.
Fixes: 56580ea7c9 ("backends/native: Assume zero rendering time for direct scanout buffers")
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3655>
Currently, ClutterFrameClock uses g_source_set_ready_time() to determine
the usec timing of the next frame. That translates into a poll() with a
millisecond timeout if no trigger occurs to break the poll() out early.
To avoid spinning the CPU, GLib always rounds *up* to the next millisecond
value unless a timeout of 0 was provided by a GSource.
This means that timeouts for the ClutterFrameClock can easily skew beyond
their expected time as the precision is too coarse.
This applies the same concept as GNOME/glib!3949 but just for the
ClutterFrameClock. That may be more ideal than adding a timerfd for every
GMainContext, but we'll see if that lands upstream. I wanted to provide
this here because it could easily be cherry-picked in the mean time if
this is found to be useful.
From a timer stability perspective, this improves things from erratically
jumping between 100s and 1000s off of the expected awake time to single
or low double digits.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3636>
A new variable scheduling mode is introduced which allows lower
priority updates to be scheduled on a timeout which represents a lower
refresh rate, while allowing high priority updates to be scheduled to
occur as soon as possible.
This mode will be used by following commits to implement
synchronization of page flips to the update rate of specifc surface
actors.
High priorty updates are either scheduled to occur "now" if they
arrive at a rate which is lower than the maximum refresh rate, or
according to the measured maximum render time if they arrive at a
rate which meets or exceeds the maximum refresh rate. This approach
allows achieving low input latency in both scenarios.
Seperate handling for low priority updates is needed to avoid visible
stutter in the content of the surface that drives the refresh rate. An
example for a low priority update is cursor movement when the KMS
deadline timer is disabled.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1154>
This is conditionally toggled by grabs on the current key focus depending
on whether the current key focus actor would receive events according
to the grab or not. Which means it's no longer a reliable method for an
actor to know it does have focus, without asking the stage about it.
Avoid this check and ask the stage for the key focus, in order to make
key focus actors able to unset themselves despite the presence of grabs.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3629>
The min height reported by ClutterText when ellipsize and line-wrapping are
enabled was too small to fit the text.
The coordinates from `pango_layout_get_line_extents()` are baseline relative,
so the `y` coordinate means that the highest ascent would be `-y` above the
baseline and height gives the span between the ascent above the baseline and
the descent below it, so `logical_line_rect.y + logical_line_rect.height`
gives us the size of the descent. This is the wrong height to use for the
height of the actor.
The coordinates of the layout extents don't seems to be related to the baseline
and are just for offsets when rendering, that's probably how this bug got
initially introduced.
Therefore, the `y` coordinate from the layout is the correct offset to use,
even though, when looking at `pango_layout_get_extends_internal()`, it appears
that `y` is always set to 0.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3610>
Do not include it at header side as it is not part of the installed headers.
Only keep it in cogl-gl-headers.h as it is a private header.
Add it to all the source files that depend on it.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3593>
Users of Clutter grabs may listen for notify::revoked changes in
order to know that their grab is no longer in charge of event
propagation, without the use of crossing events.
Since a ClutterGrab may stay in the stack and regain effects,
this notification also happens the other way around.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3420>
The MetaWaylandPointer used to put this together through
MetaCursorTracker cursor visibility, and ClutterSeat-level
inhibition API, applying the pointer focus changes due to
visibility logically to Wayland clients.
In order to make this work over all Clutter widgetry
instead of just Wayland clients, make the ClutterSeat-level
inhibition API control this feature at the ClutterStage picking
level, and leave/enter the seat pointer as appropriate.
By default, the seat pointer has (un)focus inhibited. The
MetaCursorTracker has been made another player in unfocus
inhibition, simply asking for the pointer to get its focus
while the cursor is visible.
This in practice means that picking code may return a NULL
actor, some asserts and preconditions had to be changed to
handle this, plus some test code slightly.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3420>
The new CLUTTER_FRAME_CLOCK_STATE_SCHEDULED_NOW state is almost
identical to CLUTTER_FRAME_CLOCK_STATE_SCHEDULED, with one important
difference being that it avoids updates from being repeatedly
rescheduled "now" when multiple calls to
clutter_frame_clock_schedule_update_now() are done before the source
is actually dispatched.
Such repeated calls to schedule an update "now" may actually postpone
the dispatch if the CPU is very busy and the source dispatch is
delayed, defeating the purpose of scheduling a frame "now".
It also allows rescheduling "now" when the frame clock is uninhibited
after being inhibited while an update was scheduled "now". This may
be important in cases where the frame clock is inhibited for very
short periods in which it would otherwise lose the state of being
scheduled "now".
Scenarios such as this would become more common with the introduction
of variable refresh rate since it makes scheduling "now" a commonplace
occurrence.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3561>
Currently, the paint-volumes/redraws debug flags displays the actor
debug
names on top of the paint volume making it very unusable. Especially
that you can easily get the relevant actor from looking glass.
The motivation is to reduce the usage of pango (through the text node)
in order to possibly move all the fonts bits to gnome shell
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3571>
This removes an incorrect implicit assumption in
calculate_next_update_time_us() that a frame may only be scheduled
once in the duration of a refresh cycle. It accomplishes this by
setting last_next_presentation_time_us on presentation feedback
instead of calculating it every time an update is scheduled.
Specifically, it corrects the intended scheduling logic in scenarios
like the following, when all of the below occur in the context of a
single refresh cycle:
1. Frame update (1) is scheduled normally, and
"is_next_presentation_time_valid" is set to TRUE
2. Frame update (1) is dispatched but ends up being "empty" (no
presentation necessary)
3. Frame update (2) is scheduled "now" and
"is_next_presentation_time_valid" is set to FALSE
4. Frame update (2) is dispatched but ends up being "empty" (no
presentation necessary)
5. Frame update (3) is scheduled normally, and since
"is_next_presentation_time_valid" is set to FALSE, the
"early presented event" logic is unintentionally skipped in
calculate_next_update_time_us().
6. Frame update (3) is dispatched and ends up being a "non-empty"
update, but its update time was calculated incorrectly because
some logic was skipped.
Scenarios such as this would become more common with the introduction
of variable refresh rate since it makes scheduling "now" a commonplace
occurrence.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3560>
Calculate the frame deadline in ClutterFrameClock's
calculate_next_update_time_us() rather than in MetaWaylandCompositor's
on_after_update().
The specifics of the deadline calculation for a given frame should be
implementation detail of the frame clock and and remain internal to
allow extensibility.
This extensibility is specifically useful for scenarios where a
different deadline calculation is needed due to alternative frame
scheduling logic, such as for VRR.
No change in behavior.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3521>
In various public APIs, Clutter used to return a PangoDirection
while we have a text direction enum defined in Clutter.
This allows us to drop pango dependency from meta making it specific
to cogl-pango & clutter
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3531>
Since StDrawingArea in gnome-shell is the only user of ClutterCanvas,
it is possible to move ClutterCanvas completely out of Mutter to
gnome-shell. This allows to remove another Cairo dependency from
Mutter.
This patch removes ClutterCanvas code from Mutter.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3470>
Since StDrawingArea in gnome-shell is the only user of ClutterCanvas,
it is possible to move ClutterCanvas completely out of Mutter to
gnome-shell. This allows to remove another Cairo dependency from
Mutter.
This patch makes clutter_actor_create_texture_paint_node() function
public to be used by StDrawingArea in gnome-shell that replaces
ClutterCanvas.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3507>
On one hand this avoids crashes early after startup if the very first
pointer event is a scroll event, since the stage did not pick an actor
for the pointer device yet.
On the other hand, scroll events have some likelihood to change the
actor under the pointer even though it doesn't move. We still want to
cross towards the new actor under the pointer ASAP, without waiting
for later events.
Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3112
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3517>
