diff options
| author | Ivan Molodetskikh <yalterz@gmail.com> | 2020-11-27 18:16:33 +0300 |
|---|---|---|
| committer | Marge Bot <marge-bot@gnome.org> | 2021-02-05 17:05:19 +0000 |
| commit | 01b30ff9e4406eb2c48af3f145e08990e3dcaa55 (patch) | |
| tree | e7e7733caa53fc0119879ff4e5a2e1ae9687ab66 | |
| parent | ed93a11de68c1ed475ded43f968c3ff6530736d4 (diff) | |
| download | mutter-01b30ff9e4406eb2c48af3f145e08990e3dcaa55.tar.gz | |
clutter/frame-clock: Comment presentation time skip
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1707>
| -rw-r--r-- | clutter/clutter/clutter-frame-clock.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/clutter/clutter/clutter-frame-clock.c b/clutter/clutter/clutter-frame-clock.c index 6a32ea3d7..2f617d0a5 100644 --- a/clutter/clutter/clutter-frame-clock.c +++ b/clutter/clutter/clutter-frame-clock.c @@ -280,7 +280,20 @@ calculate_next_update_time_us (ClutterFrameClock *frame_clock, next_presentation_time_us = logical_clock_phase_us + hw_clock_offset_us; } - /* Skip one interval if we got an early presented event. */ + /* + * Skip one interval if we got an early presented event. + * + * last frame this was last_presentation_time + * / frame_clock->next_presentation_time_us + * / / + * |---|-o-----|-x-----> + * | \ + * \ next_presentation_time_us is thus right after the last one + * but got an unexpected early presentation + * \_/ + * time_since_last_next_presentation_time_us + * + */ last_next_presentation_time_us = frame_clock->next_presentation_time_us; time_since_last_next_presentation_time_us = next_presentation_time_us - last_next_presentation_time_us; |