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compositor: Rearrange weston_output_finish_frame

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Move some code around so we only derive the next repaint from the next
presentation time and the repaint window once at the end of the function.

In many cases we now subtract the repaint_msec value from "now", but that's
ok because any time earlier than "now" will still result in firing the timer
at the same time.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman 2025-11-06 13:46:29 -06:00
parent 01b7e9d015
commit f36a3a91a8
1 changed files with 20 additions and 22 deletions
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42
libweston/compositor.c
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@ -4152,7 +4152,6 @@ weston_output_finish_frame(struct weston_output *output,
* timebase to work against, so any delay just wastes time. Push a
* repaint as soon as possible so we can get on with it. */
if (!stamp) {
output->next_repaint = now;
output->next_present = now;
output->frame_flags = 0;
goto out;
@ -4177,7 +4176,6 @@ weston_output_finish_frame(struct weston_output *output,
/* If we're tearing just repaint right away */
if (presented_flags & WESTON_FINISH_FRAME_TEARING) {
output->next_repaint = now;
output->next_present = now;
goto out;
}
@ -4190,7 +4188,6 @@ weston_output_finish_frame(struct weston_output *output,
* period, but try to render immediately if we're not.
*/
if (output->vrr_mode == WESTON_VRR_MODE_GAME) {
output->next_repaint = now;
/* FIXME: we should figure out if we're in Vactive to give a
* more accurate next_present time?
*/
@ -4199,38 +4196,39 @@ weston_output_finish_frame(struct weston_output *output,
}
timespec_add_nsec(&output->next_present, stamp, refresh_nsec);
timespec_add_msec(&output->next_repaint, &output->next_present,
-compositor->repaint_msec);
msec_rel = timespec_sub_to_msec(&output->next_repaint, &now);
msec_rel = timespec_sub_to_msec(&output->next_present, &now);
if (msec_rel < -1000 || msec_rel > 1000) {
weston_log_paced(&output->repaint_delay_pacer,
5, 60 * 60 * 1000,
"Warning: computed repaint delay for output "
"Warning: time until next presentation for output "
"[%s] is abnormal: %lld msec\n",
output->name, (long long) msec_rel);
output->next_repaint = now;
output->next_present = now;
}
/* Called from restart_repaint_loop and restart happens already after
* the deadline given by repaint_msec? In that case we delay until
* the deadline of the next frame, to give clients a more predictable
/* We're just starting the repaint loop, but we're too close to the
* next possible presentation time to allow a full repaint-window
* worth of time between the repaint and the presentation.
*
* Delay the deadline of the next frame, to give clients a more predictable
* timing of the repaint cycle to lock on. */
if (presented_flags == WP_PRESENTATION_FEEDBACK_INVALID &&
msec_rel < 0) {
while (timespec_sub_to_nsec(&output->next_repaint, &now) < 0) {
timespec_add_nsec(&output->next_repaint,
&output->next_repaint,
refresh_nsec);
timespec_add_nsec(&output->next_present,
&output->next_present,
refresh_nsec);
}
}
while (presented_flags == WP_PRESENTATION_FEEDBACK_INVALID &&
timespec_sub_to_msec(&output->next_present, &now) < compositor->repaint_msec)
timespec_add_nsec(&output->next_present,
&output->next_present,
refresh_nsec);
out:
if (presented_flags & WESTON_FINISH_FRAME_TEARING) {
output->next_repaint = output->next_present;
} else if (output->vrr_mode == WESTON_VRR_MODE_GAME) {
output->next_repaint = output->next_present;
} else {
timespec_add_msec(&output->next_repaint, &output->next_present,
-compositor->repaint_msec);
}
output->repaint_status = REPAINT_SCHEDULED;
output_repaint_timer_arm(compositor);
}