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clutter/frame-clock: Avoid rapidly toggling dynamic max render time

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This could happen when moving the cursor over GUIs that only redraw
in response to cursor movement. Mutter would experience alternating
cursor-only updates and page flips, and so the `max_render_time_allowed_us`
would jump between pessimised and optimised resulting in inconsistent
frame pacing.

Aside from fixing the smoothness problem this should also provide
lower latency cursor movement.

Fixes: https://launchpad.net/bugs/2023766
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3074>
This commit is contained in:
Daniel van Vugt 2023-06-14 19:49:29 +08:00 committed by Marge Bot
parent 5e5065c2b5
commit be0aa2976e
1 changed files with 3 additions and 1 deletions
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4
clutter/clutter/clutter-frame-clock.c
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@ -105,6 +105,7 @@ struct _ClutterFrameClock
/* If we got new measurements last frame. */
gboolean got_measurements_last_frame;
gboolean ever_got_measurements;
gboolean pending_reschedule;
gboolean pending_reschedule_now;
@ -349,6 +350,7 @@ clutter_frame_clock_notify_presented (ClutterFrameClock *frame_clock,
MAX (frame_clock->shortterm.max_swap_to_flip_us, swap_to_flip_us);
frame_clock->got_measurements_last_frame = TRUE;
frame_clock->ever_got_measurements = TRUE;
}
else
{
@ -423,7 +425,7 @@ clutter_frame_clock_compute_max_render_time_us (ClutterFrameClock *frame_clock)
refresh_interval_us = frame_clock->refresh_interval_us;
if (!frame_clock->got_measurements_last_frame ||
if (!frame_clock->ever_got_measurements ||
G_UNLIKELY (clutter_paint_debug_flags &
CLUTTER_DEBUG_DISABLE_DYNAMIC_MAX_RENDER_TIME))
return refresh_interval_us * SYNC_DELAY_FALLBACK_FRACTION;