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clutter/stage: Only queue compressible events

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Incompressible events already pass through unmodified, so queuing them
just wasted time and memory.

We would however like to keep the ordering of events so we can only
apply this optimization if the queue is empty.

This reduces the input latency of incompressible events like touchpad
scrolling or drawing tablets by up to one frame. It also means the same
series of events now arrives at the client more smoothly and not in
bursts.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/711
This commit is contained in:
Daniel van Vugt 2019-08-02 19:30:31 +08:00 committed by Marco Trevisan
parent bc08ad2fbb
commit 5c617ac286
1 changed files with 22 additions and 9 deletions
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31
clutter/clutter/clutter-stage.c
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@ -875,15 +875,6 @@ _clutter_stage_queue_event (ClutterStage *stage,
if (copy_event)
event = clutter_event_copy (event);
g_queue_push_tail (priv->event_queue, event);
if (first_event)
{
ClutterMasterClock *master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_start_running (master_clock);
_clutter_stage_schedule_update (stage);
}
/* if needed, update the state of the input device of the event.
* we do it here to avoid calling the same code from every backend
* event processing function
@ -904,6 +895,28 @@ _clutter_stage_queue_event (ClutterStage *stage,
_clutter_input_device_set_state (device, event_state);
_clutter_input_device_set_time (device, event_time);
}
if (first_event)
{
gboolean compressible = event->type == CLUTTER_MOTION ||
event->type == CLUTTER_TOUCH_UPDATE;
if (!compressible)
{
_clutter_process_event (event);
clutter_event_free (event);
return;
}
}
g_queue_push_tail (priv->event_queue, event);
if (first_event)
{
ClutterMasterClock *master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_start_running (master_clock);
_clutter_stage_schedule_update (stage);
}
}
gboolean