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2008-03-07 Robert Bragg <bob@o-hand.com>

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* clutter/clutter-timeline.c:
	Timeline changes to fix the issues identified in bugzilla #439
	
	Notably, this includes some tweaks to timeline semantics. So e.g. for a   
	10 frame timeline here are some points about the new timeline code:
	- When you create a timeline it starts with current_frame_num == 0
	- After starting a timeline, the first timeout is for
	  current_frame_num == 1 (Notably it isn't 0 since there is a delay
	  before the first timeout signals so re-asserting the starting point
	  would give a longer than average first frame.)
	- For a non looping timeline the last timeout would be for
	  current_frame_num == 10
	- For a looping timeline the timeout for current_frame_num == 10 would      
	  be followed by a timeout for current_frame_num == 1 and frame 0 is
	  considered == frame 10.
	- Asking for a timeline of N frames might better be described as asking    
	  for a timeline of _length_ N.

	Warning: Although I tried to test things, I guess it's quite likely that
	this breaks somthing depending on a specific quirk of the previous
	timeline code.
This commit is contained in:
Robert Bragg 2008-03-07 01:00:00 +00:00
parent abc29d4407
commit d628513f9d
3 changed files with 186 additions and 106 deletions
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24
ChangeLog
View File

@ -1,3 +1,27 @@
2008-03-07 Robert Bragg <bob@o-hand.com>
* clutter/clutter-timeline.c:
Timeline changes to fix the issues identified in bugzilla #439
Notably, this includes some tweaks to timeline semantics. So e.g. for a
10 frame timeline here are some points about the new timeline code:
- When you create a timeline it starts with current_frame_num == 0
- After starting a timeline, the first timeout is for
current_frame_num == 1 (Notably it isn't 0 since there is a delay
before the first timeout signals so re-asserting the starting point
would give a longer than average first frame.)
- For a non looping timeline the last timeout would be for
current_frame_num == 10
- For a looping timeline the timeout for current_frame_num == 10 would
be followed by a timeout for current_frame_num == 1 and frame 0 is
considered == frame 10.
- Asking for a timeline of N frames might better be described as asking
for a timeline of _length_ N.
Warning: Although I tried to test things, I guess it's quite likely that
this breaks somthing depending on a specific quirk of the previous
timeline code.
2008-03-06 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-actor.c:

14
README
View File

@ -142,6 +142,20 @@ wanting to port to newer releases (See NEWS for general new feature info).
Release Notes for Clutter 0.8
-------------------------------
* Some more focused timeline unit tests have been added and some tweaks to
timeline semantics were made; E.g. For a 10 frame timeline here are some
points about the semantics:
- When you create a timeline it starts with current_frame_num == 0
- After starting a timeline, the first timeout is for current_frame_num == 1
(Notably it isn't 0 since there is a delay before the first timeout signals
so re-asserting the starting frame (0) wouldn't make sense.)
- For a non looping timeline the last timeout would be for
current_frame_num == 10
- For a looping timeline the timeout for current_frame_num == 10 would be
followed by a timeout for current_frame_num == 1 and frame 0 is considered
== frame 10.
- Asking for a timeline of N frames might better be described as asking for
a timeline of _length_ N.
* The behaviour of clutter_actor_get_opacity() has been slightly changed;
instead of returning the composited opacity of the entire parents chain

254
clutter/clutter-timeline.c
View File

@ -73,8 +73,7 @@ struct _ClutterTimelinePrivate
gint skipped_frames;
gulong last_frame_msecs;
gulong start_frame_secs;
GTimeVal prev_frame_timeval;
guint msecs_delta;
guint loop : 1;
@ -457,29 +456,11 @@ timeline_timeout_func (gpointer data)
ClutterTimeline *timeline = data;
ClutterTimelinePrivate *priv;
GTimeVal timeval;
gint n_frames;
guint n_frames;
gulong msecs;
gboolean retval = TRUE;
priv = timeline->priv;
if (!timeline)
{
CLUTTER_NOTE (SCHEDULER,
"The timeline [%p] has been disposed",
timeline);
return FALSE;
}
if (!priv->timeout_id)
{
CLUTTER_NOTE (SCHEDULER,
"The timeline [%p] has been removed",
timeline);
return FALSE;
}
g_object_ref (timeline);
/* Figure out potential frame skips */
@ -489,57 +470,34 @@ timeline_timeout_func (gpointer data)
timeline,
priv->current_frame_num);
/* Fire off signal */
g_signal_emit (timeline, timeline_signals[NEW_FRAME], 0,
priv->current_frame_num);
/* Signal removes source ? */
if (!priv->timeout_id)
if (!priv->prev_frame_timeval.tv_sec)
{
g_object_unref (timeline);
return FALSE;
CLUTTER_NOTE (SCHEDULER,
"Timeline [%p] recieved timeout before being initialised!",
timeline);
priv->prev_frame_timeval = timeval;
}
if (priv->last_frame_msecs)
/* Interpolate the current frame based on the timeval of the
* previous frame */
msecs = (timeval.tv_sec - priv->prev_frame_timeval.tv_sec) * 1000;
msecs += (timeval.tv_usec - priv->prev_frame_timeval.tv_usec)/1000;
priv->msecs_delta = msecs;
n_frames = msecs / (1000 / priv->fps);
if (n_frames == 0)
n_frames = 1;
priv->skipped_frames = n_frames - 1;
if (priv->skipped_frames)
{
/* Check time diff from out last call and adjust number
* of frames to advance accordingly.
*/
msecs = ((timeval.tv_sec - priv->start_frame_secs) * 1000)
+ (timeval.tv_usec / 1000);
n_frames = (msecs - priv->last_frame_msecs)
/ (1000 / priv->fps);
priv->msecs_delta = msecs - priv->last_frame_msecs;
if (n_frames <= 0)
{
n_frames = 1;
priv->skipped_frames = 0;
}
else if (n_frames > 1)
{
CLUTTER_TIMESTAMP (SCHEDULER,
"Timeline [%p], skipping %d frames\n",
timeline,
n_frames);
priv->skipped_frames = n_frames - 1;
}
else
priv->skipped_frames = 0;
}
else
{
/* First frame, set up timings.*/
priv->start_frame_secs = timeval.tv_sec;
priv->skipped_frames = 0;
priv->msecs_delta = 0;
msecs = timeval.tv_usec / 1000;
n_frames = 1;
CLUTTER_TIMESTAMP (SCHEDULER,
"Timeline [%p], skipping %d frames\n",
timeline,
priv->skipped_frames);
}
priv->last_frame_msecs = msecs;
priv->prev_frame_timeval = timeval;
/* Advance frames */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
@ -547,12 +505,35 @@ timeline_timeout_func (gpointer data)
else
priv->current_frame_num -= n_frames;
/* Handle loop or stop */
if (((priv->direction == CLUTTER_TIMELINE_FORWARD) &&
(priv->current_frame_num > priv->n_frames)) ||
/* If we have not reached the end of the timeline: */
if (!(
((priv->direction == CLUTTER_TIMELINE_FORWARD) &&
(priv->current_frame_num >= priv->n_frames)) ||
((priv->direction == CLUTTER_TIMELINE_BACKWARD) &&
(priv->current_frame_num < 0)))
(priv->current_frame_num <= 0))
))
{
/* Fire off signal */
g_signal_emit (timeline, timeline_signals[NEW_FRAME],
0, priv->current_frame_num);
/* Signal pauses timeline ? */
if (!priv->timeout_id)
{
g_object_unref (timeline);
return FALSE;
}
g_object_unref (timeline);
return TRUE;
}
else /* Handle loop or stop */
{
ClutterTimelineDirection saved_direction = priv->direction;
guint overflow_frame_num = priv->current_frame_num;
gint end_frame;
/* In case the signal handlers want to take a peek... */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
{
priv->current_frame_num = priv->n_frames;
@ -561,6 +542,22 @@ timeline_timeout_func (gpointer data)
{
priv->current_frame_num = 0;
}
end_frame = priv->current_frame_num;
/* Fire off signal */
g_signal_emit (timeline, timeline_signals[NEW_FRAME],
0, priv->current_frame_num);
/* Did the signal handler modify the current_frame_num */
if (priv->current_frame_num != end_frame)
{
g_object_unref (timeline);
return TRUE;
}
/* Note: If the new-frame signal handler paused the 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, drop: %d)",
@ -569,40 +566,81 @@ timeline_timeout_func (gpointer data)
priv->n_frames,
n_frames - 1);
/* if we skipped some frame to get here let's see whether we still need
* to emit the last new-frame signal with the last frame
*/
if (n_frames > 1)
g_signal_emit (timeline, timeline_signals[NEW_FRAME], 0,
priv->current_frame_num);
if (!priv->loop && priv->timeout_id)
{
/* We remove the timeout now, so that the completed signal handler
* may choose to re-start the timeline
*
* ** Perhaps we should remove this earlier, and regardless
* of priv->loop. Are we limiting the things that could be done in
* the above new-frame signal handler */
timeout_remove (priv->timeout_id);
priv->timeout_id = 0;
}
g_signal_emit (timeline, timeline_signals[COMPLETED], 0);
/* Again check to see if the user has manually played with
* current_frame_num, before we finally stop or loop the timeline */
if (priv->current_frame_num != end_frame &&
!(/* Except allow moving from frame 0 -> n_frame (or vica-versa)
since these are considered equivalent */
(priv->current_frame_num == 0 && end_frame == priv->n_frames) ||
(priv->current_frame_num == priv->n_frames && end_frame == 0)
))
{
g_object_unref (timeline);
return TRUE;
}
if (priv->loop)
{
g_signal_emit (timeline, timeline_signals[COMPLETED], 0);
clutter_timeline_rewind (timeline);
{
/* We try and interpolate smoothly around a loop */
if (saved_direction == CLUTTER_TIMELINE_FORWARD)
priv->current_frame_num = overflow_frame_num - priv->n_frames;
else
priv->current_frame_num = priv->n_frames + overflow_frame_num;
retval = TRUE;
}
/* Or if the direction changed, we try and bounce */
if (priv->direction != saved_direction)
priv->current_frame_num =
priv->n_frames - priv->current_frame_num;
g_object_unref (timeline);
return TRUE;
}
else
{
if (priv->timeout_id)
{
timeout_remove (priv->timeout_id);
priv->timeout_id = 0;
}
priv->last_frame_msecs = 0;
g_signal_emit (timeline, timeline_signals[COMPLETED], 0);
{
clutter_timeline_rewind (timeline);
retval = FALSE;
}
priv->prev_frame_timeval.tv_sec = 0;
priv->prev_frame_timeval.tv_usec = 0;
g_object_unref (timeline);
return FALSE;
}
}
}
g_object_unref (timeline);
static guint
timeline_timeout_add (ClutterTimeline *timeline,
guint interval,
GSourceFunc func,
gpointer data,
GDestroyNotify notify)
{
ClutterTimelinePrivate *priv;
GTimeVal timeval;
return retval;
priv = timeline->priv;
if (priv->prev_frame_timeval.tv_sec == 0)
{
g_get_current_time (&timeval);
priv->prev_frame_timeval = timeval;
}
priv->skipped_frames = 0;
priv->msecs_delta = 0;
return timeout_add (interval, func, data, notify);
}
static gboolean
@ -613,9 +651,10 @@ delay_timeout_func (gpointer data)
priv->delay_id = 0;
priv->timeout_id = timeout_add (FPS_TO_INTERVAL (priv->fps),
timeline_timeout_func,
timeline, NULL);
priv->timeout_id = timeline_timeout_add (timeline,
FPS_TO_INTERVAL (priv->fps),
timeline_timeout_func,
timeline, NULL);
g_signal_emit (timeline, timeline_signals[STARTED], 0);
@ -651,9 +690,10 @@ clutter_timeline_start (ClutterTimeline *timeline)
}
else
{
priv->timeout_id = timeout_add (FPS_TO_INTERVAL (priv->fps),
timeline_timeout_func,
timeline, NULL);
priv->timeout_id = timeline_timeout_add (timeline,
FPS_TO_INTERVAL (priv->fps),
timeline_timeout_func,
timeline, NULL);
g_signal_emit (timeline, timeline_signals[STARTED], 0);
}
@ -686,7 +726,8 @@ clutter_timeline_pause (ClutterTimeline *timeline)
priv->timeout_id = 0;
}
priv->last_frame_msecs = 0;
priv->prev_frame_timeval.tv_sec = 0;
priv->prev_frame_timeval.tv_usec = 0;
g_signal_emit (timeline, timeline_signals[PAUSED], 0);
}
@ -904,9 +945,10 @@ clutter_timeline_set_speed (ClutterTimeline *timeline,
{
timeout_remove (priv->timeout_id);
priv->timeout_id = timeout_add (FPS_TO_INTERVAL (priv->fps),
timeline_timeout_func,
timeline, NULL);
priv->timeout_id = timeline_timeout_add (timeline,
FPS_TO_INTERVAL (priv->fps),
timeline_timeout_func,
timeline, NULL);
}
g_object_notify (G_OBJECT (timeline), "fps");