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[timeline] Don't clamp the elapsed time when a looping tl reaches the end

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The new-frame signal of a timeline was previously guaranteed to be
emitted with the elapsed_time set to the end before it emits the
completed signal. This doesn't necessarily make sense for looping
timelines because it would cause the elapsed time to be clamped to a
slightly off value whenever the timeline restarts. This patch makes it
perform the wrap around before emitting the new-frame signal so that
the elapsed time always corresponds to the time elapsed since the
timeline was started.

Additionally it no longer fudges the msecs_delta property to make the
marker check work so clutter_timeline_get_delta will always return the
wall clock time since the last frame.
This commit is contained in:
Neil Roberts 2009-06-10 17:41:16 +01:00
parent acf7722a41
commit 9c5663d671
2 changed files with 97 additions and 55 deletions
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134
clutter/clutter-timeline.c
View File

@ -430,22 +430,76 @@ clutter_timeline_init (ClutterTimeline *self)
priv->elapsed_time = 0;
}
static void
check_if_marker_hit (const gchar *name,
TimelineMarker *marker,
ClutterTimeline *timeline)
static gboolean
have_passed_time (ClutterTimeline *timeline,
gint new_time,
gint msecs)
{
ClutterTimelinePrivate *priv = timeline->priv;
if (priv->direction == CLUTTER_TIMELINE_FORWARD
? (marker->msecs > priv->elapsed_time - priv->msecs_delta
&& marker->msecs <= priv->elapsed_time)
: (marker->msecs >= priv->elapsed_time
&& marker->msecs < priv->elapsed_time + priv->msecs_delta))
/* Ignore markers that are outside the duration of the timeline */
if (msecs < 0 || msecs > priv->duration)
return FALSE;
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
{
/* We need to special case when a marker is added at the
beginning of the timeline */
if (msecs == 0 &&
priv->msecs_delta > 0 &&
new_time - priv->msecs_delta <= 0)
return TRUE;
/* If the timeline is looping then we need to check for wrap
around */
if (priv->loop && new_time >= priv->duration)
return (msecs > new_time - priv->msecs_delta ||
msecs <= new_time % priv->duration);
/* Otherwise it's just a simple test if the time is in range of
the previous time and the new time */
return (msecs > new_time - priv->msecs_delta
&& msecs <= new_time);
}
else
{
/* We need to special case when a marker is added at the
end of the timeline */
if (msecs == priv->duration &&
priv->msecs_delta > 0 &&
new_time + priv->msecs_delta >= priv->duration)
return TRUE;
/* If the timeline is looping then we need to check for wrap
around */
if (priv->loop && new_time <= 0)
return (msecs < new_time + priv->msecs_delta ||
msecs >= (priv->duration -
(-new_time % priv->duration)));
/* Otherwise it's just a simple test if the time is in range of
the previous time and the new time */
return (msecs >= new_time
&& msecs < new_time + priv->msecs_delta);
}
}
struct CheckIfMarkerHitClosure
{
ClutterTimeline *timeline;
gint new_time;
};
static void
check_if_marker_hit (const gchar *name,
TimelineMarker *marker,
struct CheckIfMarkerHitClosure *data)
{
if (have_passed_time (data->timeline, data->new_time, marker->msecs))
{
CLUTTER_NOTE (SCHEDULER, "Marker '%s' reached", name);
g_signal_emit (timeline, timeline_signals[MARKER_REACHED],
g_signal_emit (data->timeline, timeline_signals[MARKER_REACHED],
marker->quark,
name,
marker->msecs);
@ -453,10 +507,12 @@ check_if_marker_hit (const gchar *name,
}
static void
emit_frame_signal (ClutterTimeline *timeline)
emit_frame_signal (ClutterTimeline *timeline, gint new_time)
{
ClutterTimelinePrivate *priv = timeline->priv;
struct CheckIfMarkerHitClosure data;
/* Emit the signal */
g_signal_emit (timeline, timeline_signals[NEW_FRAME], 0,
priv->elapsed_time);
@ -464,9 +520,12 @@ emit_frame_signal (ClutterTimeline *timeline)
if (priv->markers_by_name == NULL)
return;
data.timeline = timeline;
data.new_time = new_time;
g_hash_table_foreach (priv->markers_by_name,
(GHFunc) check_if_marker_hit,
timeline);
&data);
}
static gboolean
@ -527,7 +586,7 @@ clutter_timeline_do_frame (ClutterTimeline *timeline)
if (!is_complete (timeline))
{
/* Emit the signal */
emit_frame_signal (timeline);
emit_frame_signal (timeline, priv->elapsed_time);
/* Signal pauses timeline ? */
if (!priv->is_playing)
@ -542,29 +601,31 @@ clutter_timeline_do_frame (ClutterTimeline *timeline)
else
{
/* Handle loop or stop */
ClutterTimelineDirection saved_direction = priv->direction;
guint overflow_msecs = priv->elapsed_time;
gint end_msecs;
gint overflow_msecs = priv->elapsed_time;
/* Update the current elapsed time in case the signal handlers
* want to take a peek. If we clamp elapsed time, then we need
* to correpondingly reduce msecs_delta to reflect the correct
* range of times */
* want to take a peek */
if (priv->loop)
{
/* We try and interpolate smoothly around a loop */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
{
priv->msecs_delta -= (priv->elapsed_time - priv->duration);
priv->elapsed_time = priv->elapsed_time % priv->duration;
else
priv->elapsed_time = (priv->duration -
(-priv->elapsed_time % priv->duration));
}
else if (priv->direction == CLUTTER_TIMELINE_FORWARD)
priv->elapsed_time = priv->duration;
}
else if (priv->direction == CLUTTER_TIMELINE_BACKWARD)
{
priv->msecs_delta -= - priv->elapsed_time;
priv->elapsed_time = 0;
}
end_msecs = priv->elapsed_time;
/* Emit the signal */
emit_frame_signal (timeline);
/* Check if the markers have been hit using the old value of
elapsed time so it will use the right value for the previous
elapsed time */
emit_frame_signal (timeline, overflow_msecs);
/* Did the signal handler modify the elapsed time? */
if (priv->elapsed_time != end_msecs)
@ -609,28 +670,11 @@ clutter_timeline_do_frame (ClutterTimeline *timeline)
return TRUE;
}
if (priv->loop)
{
/* We try and interpolate smoothly around a loop */
if (saved_direction == CLUTTER_TIMELINE_FORWARD)
priv->elapsed_time = overflow_msecs - priv->duration;
else
priv->elapsed_time = priv->duration + overflow_msecs;
/* Or if the direction changed, we try and bounce */
if (priv->direction != saved_direction)
priv->elapsed_time = priv->duration - priv->elapsed_time;
g_object_unref (timeline);
return TRUE;
}
else
{
if (!priv->loop)
clutter_timeline_rewind (timeline);
g_object_unref (timeline);
return FALSE;
}
return priv->loop;
}
}

8
tests/conform/test-timeline-interpolate.c
View File

@ -46,14 +46,12 @@ new_frame_cb (ClutterTimeline *timeline,
/* If we expect to have interpolated past the end of the timeline
* we keep track of the overflow so we can determine when
* the next timeout will happen. We then clip expected_frames
* to TEST_TIMELINE_DURATION since clutter-timeline
* semantics guaranty this frame is always signaled before
* looping */
* the next timeout will happen. We then wrap expected_frames
* around TEST_TIMELINE_DURATION */
if (state->expected_frame > TEST_TIMELINE_DURATION)
{
loop_overflow = state->expected_frame - TEST_TIMELINE_DURATION;
state->expected_frame = TEST_TIMELINE_DURATION;
state->expected_frame %= TEST_TIMELINE_DURATION;
}
if (current_frame >= (state->expected_frame-TEST_ERROR_TOLERANCE)