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clutter/stage-cogl: Reduce while loop iterations

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If `last_presentation_time` is zero (unsupported) or just very old
(system was idle) then we would like to avoid that triggering a large
number of loop interations. This will get us closer to the right answer
without iterating.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/363
This commit is contained in:
Daniel van Vugt 2019-06-06 15:39:26 +08:00 committed by Georges Basile Stavracas Neto
parent 35aa278194
commit 67a3715ded
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1 changed files with 13 additions and 0 deletions
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13
clutter/clutter/cogl/clutter-stage-cogl.c
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@ -204,6 +204,19 @@ clutter_stage_cogl_schedule_update (ClutterStageWindow *stage_window,
next_presentation_time = stage_cogl->last_presentation_time + refresh_interval;
/* Get next_presentation_time closer to its final value, to reduce
* the number of while iterations below.
*/
if (next_presentation_time < now)
{
int64_t last_virtual_presentation_time = now - now % refresh_interval;
int64_t hardware_clock_phase =
stage_cogl->last_presentation_time % refresh_interval;
next_presentation_time =
last_virtual_presentation_time + hardware_clock_phase;
}
while (next_presentation_time < now + min_render_time_allowed)
next_presentation_time += refresh_interval;