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GtkTimeline: Wrap around the progress correctly when looping

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When we have a looping animation for something like an angle,
we need to make sure that the distance we go past 1.0 becomes
the starting distance for the next frame. This prevents a
stutter at the loop position.

https://bugzilla.gnome.org/show_bug.cgi?id=685460
This commit is contained in:
Owen W. Taylor 2012-09-28 12:38:14 -04:00
parent 215d029c83
commit 672100b822
1 changed files with 20 additions and 2 deletions
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22
gtk/gtktimeline.c
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@ -357,7 +357,7 @@ gtk_timeline_on_update (GdkFrameClock *clock,
GtkTimeline *timeline)
{
GtkTimelinePriv *priv;
gdouble delta_progress, progress;
gdouble delta_progress, progress, adjust;
guint64 now;
/* the user may unref us during the signals, so save ourselves */
@ -381,6 +381,21 @@ gtk_timeline_on_update (GdkFrameClock *clock,
priv->last_progress = progress;
/* When looping, if we go past the end, start that much into the
* next cycle */
if (progress < 0.0)
{
adjust = progress - ceil(progress);
progress = 0.0;
}
else if (progress > 1.0)
{
adjust = progress - floor(progress);
progress = 1.0;
}
else
adjust = 0.0;
progress = CLAMP (progress, 0., 1.);
}
else
@ -398,7 +413,10 @@ gtk_timeline_on_update (GdkFrameClock *clock,
loop = priv->loop && priv->animations_enabled;
if (loop)
gtk_timeline_rewind (timeline);
{
gtk_timeline_rewind (timeline);
priv->progress += adjust;
}
else
{
gtk_timeline_stop_running (timeline);