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animation: Change how we seed the initial time

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With the addition of the weston_output_set_ready() call, the shell fade
animation is now started during the very first repaint. The first repaint
doesn't have an accurate frame_time for the previous repaint, as none has
occurred yet.

Since we set the time base for an animation based on the output's frame
time the second time the animation is run, we end up setting the shell fade
start time to 0, and the first real repaint advances the timer to the real
time, generating a warning and truncating the animation.

Instead of tracking the number of animation frames, let's just continue to
reset the time base until we finally get a non-zero time.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman 2025-11-24 12:29:15 -06:00
parent 9b89e7d94e
commit b44cf1b6af
3 changed files with 14 additions and 6 deletions
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1
include/libweston/libweston.h
View file

@ -160,7 +160,6 @@ struct weston_animation {
void (*frame)(struct weston_animation *animation,
struct weston_output *output,
const struct timespec *time);
int frame_counter;
struct wl_list link;
};

15
libweston/animation.c
View file

@ -199,7 +199,19 @@ weston_view_animation_frame(struct weston_animation *base,
struct weston_compositor *compositor =
animation->view->surface->compositor;
if (base->frame_counter <= 1)
/* Animations are created with timestamp 0, so we need to set a
* real time base on the first repaint.
*
* In some cases, such as when the repaint loop has just started
* for a new display, the time we're given could be 0 for our
* second call - but this is ok because weston_spring_update() will
* do nothing as long as spring.timestamp == time.
*
* We can safely just keep updating the timestamp until we get
* something non-zero, and the spring will start updating after
* that.
*/
if (!timespec_to_msec(&animation->spring.timestamp))
animation->spring.timestamp = *time;
weston_spring_update(&animation->spring, time);
@ -275,7 +287,6 @@ weston_view_animation_run(struct weston_view_animation *animation)
{
struct timespec zero_time = { 0 };
animation->animation.frame_counter = 0;
weston_view_animation_frame(&animation->animation, NULL, &zero_time);
}

4
libweston/compositor.c
View file

@ -3737,10 +3737,8 @@ weston_output_repaint(struct weston_output *output)
wl_resource_destroy(cb);
}
wl_list_for_each_safe(animation, next, &output->animation_list, link) {
animation->frame_counter++;
wl_list_for_each_safe(animation, next, &output->animation_list, link)
animation->frame(animation, output, &output->frame_time);
}
weston_output_capture_info_repaint_done(output->capture_info);