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clutter/frame-clock: Comment common case of next presentation time

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Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1707>
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Ivan Molodetskikh 2021-02-04 12:26:08 +03:00 committed by Marge Bot
parent bc7c56fa74
commit ed93a11de6
1 changed files with 17 additions and 0 deletions
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17
clutter/clutter/clutter-frame-clock.c
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@ -246,6 +246,23 @@ calculate_next_update_time_us (ClutterFrameClock *frame_clock,
if (min_render_time_allowed_us > max_render_time_allowed_us)
min_render_time_allowed_us = max_render_time_allowed_us;
/*
* The common case is that the next presentation happens 1 refresh interval
* after the last presentation:
*
* last_presentation_time_us
* / next_presentation_time_us
* / /
* / /
* |--|--o----|-------|--> presentation times
* | | \ |
* | | now_us
* | \______/
* | refresh_interval_us
* |
* 0
*
*/
last_presentation_time_us = frame_clock->last_presentation_time_us;
next_presentation_time_us = last_presentation_time_us + refresh_interval_us;