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[timeline] Account for clock roll backs between frames

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If the system clock rolls back between two frames then we need
to account for the change, to avoid stopping the timeline.

The best option, since a roll back can be any arbitrary amount
of milliseconds, is to skip a frame.

Fixes bug:

  http://bugzilla.moblin.org/show_bug.cgi?id=3839
This commit is contained in:
Emmanuele Bassi 2009-09-16 11:55:04 +01:00
parent 0d08f6e070
commit 9dc012c07d
1 changed files with 23 additions and 10 deletions
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33
clutter/clutter-timeline.c
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@ -56,9 +56,10 @@ struct _ClutterTimelinePrivate
guint delay;
/* The current amount of elapsed time */
gint elapsed_time;
gint64 elapsed_time;
/* The elapsed time since the last frame was fired */
gint msecs_delta;
gint64 msecs_delta;
GHashTable *markers_by_name;
@ -570,9 +571,9 @@ clutter_timeline_do_frame (ClutterTimeline *timeline)
g_object_ref (timeline);
CLUTTER_TIMESTAMP (SCHEDULER, "Timeline [%p] activated (cur: %d)\n",
CLUTTER_TIMESTAMP (SCHEDULER, "Timeline [%p] activated (cur: %ld)\n",
timeline,
priv->elapsed_time);
(long) priv->elapsed_time);
/* Advance time */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
@ -637,10 +638,10 @@ clutter_timeline_do_frame (ClutterTimeline *timeline)
* on the last frame we will still go ahead and send the
* completed signal */
CLUTTER_NOTE (SCHEDULER,
"Timeline [%p] completed (cur: %d, tot: %d)",
"Timeline [%p] completed (cur: %ld, tot: %ld)",
timeline,
priv->elapsed_time,
priv->msecs_delta);
(long) priv->elapsed_time,
(long) priv->msecs_delta);
if (!priv->loop && priv->is_playing)
{
@ -1223,9 +1224,21 @@ clutter_timeline_do_tick (ClutterTimeline *timeline,
}
else
{
gint msecs =
(tick_time->tv_sec - priv->last_frame_time.tv_sec) * 1000
+ (tick_time->tv_usec - priv->last_frame_time.tv_usec) / 1000;
gint64 msecs;
msecs = (tick_time->tv_sec - priv->last_frame_time.tv_sec) * 1000
+ (tick_time->tv_usec - priv->last_frame_time.tv_usec) / 1000;
/* if the clock rolled back between ticks we need to
* account for it; the best course of action, since the
* clock roll back can happen by any arbitrary amount
* of milliseconds, is to drop a frame here
*/
if (msecs < 0)
{
priv->last_frame_time = *tick_time;
return;
}
if (msecs != 0)
{