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mutter-performance-source/clutter/clutter-timeline.c
Emmanuele Bassi 9dc012c07d [timeline] Account for clock roll backs between frames 
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
2009-09-16 11:57:57 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-timeline
* @short_description: A class for time-based events
*
* #ClutterTimeline is a base class for managing time based events such
* as animations.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-main.h"
#include "clutter-marshal.h"
#include "clutter-master-clock.h"
#include "clutter-private.h"
#include "clutter-timeline.h"
G_DEFINE_TYPE (ClutterTimeline, clutter_timeline, G_TYPE_OBJECT);
struct _ClutterTimelinePrivate
{
ClutterTimelineDirection direction;
guint delay_id;
/* The total length in milliseconds of this timeline */
guint duration;
guint delay;
/* The current amount of elapsed time */
gint64 elapsed_time;
/* The elapsed time since the last frame was fired */
gint64 msecs_delta;
GHashTable *markers_by_name;
/* Time we last advanced the elapsed time and showed a frame */
GTimeVal last_frame_time;
guint loop : 1;
guint is_playing : 1;
/* If we've just started playing and haven't yet gotten a tick from the master clock */
guint waiting_first_tick : 1;
};
typedef struct {
gchar *name;
guint msecs;
GQuark quark;
} TimelineMarker;
enum
{
PROP_0,
PROP_LOOP,
PROP_DELAY,
PROP_DURATION,
PROP_DIRECTION
};
enum
{
NEW_FRAME,
STARTED,
PAUSED,
COMPLETED,
MARKER_REACHED,
LAST_SIGNAL
};
static guint timeline_signals[LAST_SIGNAL] = { 0, };
static TimelineMarker *
timeline_marker_new (const gchar *name,
guint msecs)
{
TimelineMarker *marker = g_slice_new0 (TimelineMarker);
marker->name = g_strdup (name);
marker->quark = g_quark_from_string (marker->name);
marker->msecs = msecs;
return marker;
}
static void
timeline_marker_free (gpointer data)
{
if (G_LIKELY (data))
{
TimelineMarker *marker = data;
g_free (marker->name);
g_slice_free (TimelineMarker, marker);
}
}
/* Object */
static void
clutter_timeline_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterTimeline *timeline;
ClutterTimelinePrivate *priv;
timeline = CLUTTER_TIMELINE(object);
priv = timeline->priv;
switch (prop_id)
{
case PROP_LOOP:
priv->loop = g_value_get_boolean (value);
break;
case PROP_DELAY:
priv->delay = g_value_get_uint (value);
break;
case PROP_DURATION:
clutter_timeline_set_duration (timeline, g_value_get_uint (value));
break;
case PROP_DIRECTION:
clutter_timeline_set_direction (timeline, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_timeline_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterTimeline *timeline;
ClutterTimelinePrivate *priv;
timeline = CLUTTER_TIMELINE(object);
priv = timeline->priv;
switch (prop_id)
{
case PROP_LOOP:
g_value_set_boolean (value, priv->loop);
break;
case PROP_DELAY:
g_value_set_uint (value, priv->delay);
break;
case PROP_DURATION:
g_value_set_uint (value, clutter_timeline_get_duration (timeline));
break;
case PROP_DIRECTION:
g_value_set_enum (value, priv->direction);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_timeline_finalize (GObject *object)
{
ClutterTimeline *self = CLUTTER_TIMELINE (object);
ClutterTimelinePrivate *priv = self->priv;
ClutterMasterClock *master_clock;
if (priv->markers_by_name)
g_hash_table_destroy (priv->markers_by_name);
if (priv->is_playing)
{
master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_remove_timeline (master_clock, self);
}
G_OBJECT_CLASS (clutter_timeline_parent_class)->finalize (object);
}
static void
clutter_timeline_dispose (GObject *object)
{
ClutterTimeline *self = CLUTTER_TIMELINE(object);
ClutterTimelinePrivate *priv;
priv = self->priv;
if (priv->delay_id)
{
g_source_remove (priv->delay_id);
priv->delay_id = 0;
}
G_OBJECT_CLASS (clutter_timeline_parent_class)->dispose (object);
}
static void
clutter_timeline_class_init (ClutterTimelineClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GParamSpec *pspec;
object_class->set_property = clutter_timeline_set_property;
object_class->get_property = clutter_timeline_get_property;
object_class->finalize = clutter_timeline_finalize;
object_class->dispose = clutter_timeline_dispose;
g_type_class_add_private (klass, sizeof (ClutterTimelinePrivate));
/**
* ClutterTimeline:loop:
*
* Whether the timeline should automatically rewind and restart.
*/
pspec = g_param_spec_boolean ("loop",
"Loop",
"Should the timeline automatically restart",
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_LOOP, pspec);
/**
* ClutterTimeline:delay:
*
* A delay, in milliseconds, that should be observed by the
* timeline before actually starting.
*
* Since: 0.4
*/
pspec = g_param_spec_uint ("delay",
"Delay",
"Delay before start",
0, G_MAXUINT,
0,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_DELAY, pspec);
/**
* ClutterTimeline:duration:
*
* Duration of the timeline in milliseconds, depending on the
* ClutterTimeline:fps value.
*
* Since: 0.6
*/
pspec = g_param_spec_uint ("duration",
"Duration",
"Duration of the timeline in milliseconds",
0, G_MAXUINT,
1000,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_DURATION, pspec);
/**
* ClutterTimeline:direction:
*
* The direction of the timeline, either %CLUTTER_TIMELINE_FORWARD or
* %CLUTTER_TIMELINE_BACKWARD.
*
* Since: 0.6
*/
pspec = g_param_spec_enum ("direction",
"Direction",
"Direction of the timeline",
CLUTTER_TYPE_TIMELINE_DIRECTION,
CLUTTER_TIMELINE_FORWARD,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_DIRECTION, pspec);
/**
* ClutterTimeline::new-frame:
* @timeline: the timeline which received the signal
* @msecs: the elapsed time between 0 and duration
*
* The ::new-frame signal is emitted for each timeline running
* timeline before a new frame is drawn to give animations a chance
* to update the scene.
*/
timeline_signals[NEW_FRAME] =
g_signal_new (I_("new-frame"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterTimelineClass, new_frame),
NULL, NULL,
clutter_marshal_VOID__INT,
G_TYPE_NONE,
1, G_TYPE_INT);
/**
* ClutterTimeline::completed:
* @timeline: the #ClutterTimeline which received the signal
*
* The ::completed signal is emitted when the timeline reaches the
* number of frames specified by the ClutterTimeline:num-frames property.
*/
timeline_signals[COMPLETED] =
g_signal_new (I_("completed"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterTimelineClass, completed),
NULL, NULL,
clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* ClutterTimeline::started:
* @timeline: the #ClutterTimeline which received the signal
*
* The ::started signal is emitted when the timeline starts its run.
* This might be as soon as clutter_timeline_start() is invoked or
* after the delay set in the ClutterTimeline:delay property has
* expired.
*/
timeline_signals[STARTED] =
g_signal_new (I_("started"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterTimelineClass, started),
NULL, NULL,
clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* ClutterTimeline::paused:
* @timeline: the #ClutterTimeline which received the signal
*
* The ::paused signal is emitted when clutter_timeline_pause() is invoked.
*/
timeline_signals[PAUSED] =
g_signal_new (I_("paused"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterTimelineClass, paused),
NULL, NULL,
clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* ClutterTimeline::marker-reached:
* @timeline: the #ClutterTimeline which received the signal
* @marker_name: the name of the marker reached
* @msecs: the elapsed time
*
* The ::marker-reached signal is emitted each time a timeline
* reaches a marker set with
* clutter_timeline_add_marker_at_time(). This signal is detailed
* with the name of the marker as well, so it is possible to connect
* a callback to the ::marker-reached signal for a specific marker
* with:
*
* <informalexample><programlisting>
* clutter_timeline_add_marker_at_time (timeline, "foo", 500);
* clutter_timeline_add_marker_at_time (timeline, "bar", 750);
*
* g_signal_connect (timeline, "marker-reached",
* G_CALLBACK (each_marker_reached), NULL);
* g_signal_connect (timeline, "marker-reached::foo",
* G_CALLBACK (foo_marker_reached), NULL);
* g_signal_connect (timeline, "marker-reached::bar",
* G_CALLBACK (bar_marker_reached), NULL);
* </programlisting></informalexample>
*
* In the example, the first callback will be invoked for both
* the "foo" and "bar" marker, while the second and third callbacks
* will be invoked for the "foo" or "bar" markers, respectively.
*
* Since: 0.8
*/
timeline_signals[MARKER_REACHED] =
g_signal_new (I_("marker-reached"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_NO_RECURSE |
G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
G_STRUCT_OFFSET (ClutterTimelineClass, marker_reached),
NULL, NULL,
clutter_marshal_VOID__STRING_INT,
G_TYPE_NONE, 2,
G_TYPE_STRING,
G_TYPE_INT);
}
static void
clutter_timeline_init (ClutterTimeline *self)
{
ClutterTimelinePrivate *priv;
self->priv = priv =
G_TYPE_INSTANCE_GET_PRIVATE (self, CLUTTER_TYPE_TIMELINE,
ClutterTimelinePrivate);
priv->duration = 0;
priv->delay = 0;
priv->elapsed_time = 0;
}
struct CheckIfMarkerHitClosure
{
ClutterTimeline *timeline;
ClutterTimelineDirection direction;
gint new_time;
gint duration;
gint delta;
};
static gboolean
have_passed_time (const struct CheckIfMarkerHitClosure *data,
gint msecs)
{
/* Ignore markers that are outside the duration of the timeline */
if (msecs < 0 || msecs > data->duration)
return FALSE;
if (data->direction == CLUTTER_TIMELINE_FORWARD)
{
/* We need to special case when a marker is added at the
beginning of the timeline */
if (msecs == 0 &&
data->delta > 0 &&
data->new_time - data->delta <= 0)
return TRUE;
/* Otherwise it's just a simple test if the time is in range of
the previous time and the new time */
return (msecs > data->new_time - data->delta
&& msecs <= data->new_time);
}
else
{
/* We need to special case when a marker is added at the
end of the timeline */
if (msecs == data->duration &&
data->delta > 0 &&
data->new_time + data->delta >= data->duration)
return TRUE;
/* Otherwise it's just a simple test if the time is in range of
the previous time and the new time */
return (msecs >= data->new_time
&& msecs < data->new_time + data->delta);
}
}
static void
check_if_marker_hit (const gchar *name,
TimelineMarker *marker,
struct CheckIfMarkerHitClosure *data)
{
if (have_passed_time (data, marker->msecs))
{
CLUTTER_NOTE (SCHEDULER, "Marker '%s' reached", name);
g_signal_emit (data->timeline, timeline_signals[MARKER_REACHED],
marker->quark,
name,
marker->msecs);
}
}
static void
check_markers (ClutterTimeline *timeline,
gint delta)
{
ClutterTimelinePrivate *priv = timeline->priv;
struct CheckIfMarkerHitClosure data;
/* shortcircuit here if we don't have any marker installed */
if (priv->markers_by_name == NULL)
return;
/* store the details of the timeline so that changing them in a
marker signal handler won't affect which markers are hit */
data.timeline = timeline;
data.direction = priv->direction;
data.new_time = priv->elapsed_time;
data.duration = priv->duration;
data.delta = delta;
g_hash_table_foreach (priv->markers_by_name,
(GHFunc) check_if_marker_hit,
&data);
}
static void
emit_frame_signal (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv = timeline->priv;
g_signal_emit (timeline, timeline_signals[NEW_FRAME], 0,
priv->elapsed_time);
}
static gboolean
is_complete (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv = timeline->priv;
return (priv->direction == CLUTTER_TIMELINE_FORWARD
? priv->elapsed_time >= priv->duration
: priv->elapsed_time <= 0);
}
static void
set_is_playing (ClutterTimeline *timeline,
gboolean is_playing)
{
ClutterTimelinePrivate *priv = timeline->priv;
ClutterMasterClock *master_clock;
is_playing = is_playing != FALSE;
if (is_playing == priv->is_playing)
return;
priv->is_playing = is_playing;
master_clock = _clutter_master_clock_get_default ();
if (priv->is_playing)
{
_clutter_master_clock_add_timeline (master_clock, timeline);
priv->waiting_first_tick = TRUE;
}
else
{
_clutter_master_clock_remove_timeline (master_clock, timeline);
}
}
static gboolean
clutter_timeline_do_frame (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
priv = timeline->priv;
g_object_ref (timeline);
CLUTTER_TIMESTAMP (SCHEDULER, "Timeline [%p] activated (cur: %ld)\n",
timeline,
(long) priv->elapsed_time);
/* Advance time */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
priv->elapsed_time += priv->msecs_delta;
else
priv->elapsed_time -= priv->msecs_delta;
/* If we have not reached the end of the timeline: */
if (!is_complete (timeline))
{
/* Emit the signal */
emit_frame_signal (timeline);
check_markers (timeline, priv->msecs_delta);
/* Signal pauses timeline ? */
if (!priv->is_playing)
{
g_object_unref (timeline);
return FALSE;
}
g_object_unref (timeline);
return TRUE;
}
else
{
/* Handle loop or stop */
ClutterTimelineDirection saved_direction = priv->direction;
gint elapsed_time_delta = priv->msecs_delta;
guint overflow_msecs = priv->elapsed_time;
gint end_msecs;
/* 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 elapsed_time_delta to reflect the correct
* range of times */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
{
elapsed_time_delta -= (priv->elapsed_time - priv->duration);
priv->elapsed_time = priv->duration;
}
else if (priv->direction == CLUTTER_TIMELINE_BACKWARD)
{
elapsed_time_delta -= - priv->elapsed_time;
priv->elapsed_time = 0;
}
end_msecs = priv->elapsed_time;
/* Emit the signal */
emit_frame_signal (timeline);
check_markers (timeline, elapsed_time_delta);
/* Did the signal handler modify the elapsed time? */
if (priv->elapsed_time != end_msecs)
{
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: %ld, tot: %ld)",
timeline,
(long) priv->elapsed_time,
(long) priv->msecs_delta);
if (!priv->loop && priv->is_playing)
{
/* We remove the timeout now, so that the completed signal handler
* may choose to re-start the timeline
*
* XXX 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 */
set_is_playing (timeline, FALSE);
}
g_signal_emit (timeline, timeline_signals[COMPLETED], 0);
/* Again check to see if the user has manually played with
* the elapsed time, before we finally stop or loop the timeline */
if (priv->elapsed_time != end_msecs &&
!(/* Except allow changing time from 0 -> duration (or vice-versa)
since these are considered equivalent */
(priv->elapsed_time == 0 && end_msecs == priv->duration) ||
(priv->elapsed_time == priv->duration && end_msecs == 0)
))
{
g_object_unref (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;
/* If we have overflowed then we are changing the elapsed
time without emitting the new frame signal so we need to
check for markers again */
check_markers (timeline,
priv->direction == CLUTTER_TIMELINE_FORWARD ?
priv->elapsed_time :
priv->duration - priv->elapsed_time);
g_object_unref (timeline);
return TRUE;
}
else
{
clutter_timeline_rewind (timeline);
g_object_unref (timeline);
return FALSE;
}
}
}
static gboolean
delay_timeout_func (gpointer data)
{
ClutterTimeline *timeline = data;
ClutterTimelinePrivate *priv = timeline->priv;
priv->delay_id = 0;
priv->msecs_delta = 0;
set_is_playing (timeline, TRUE);
g_signal_emit (timeline, timeline_signals[STARTED], 0);
return FALSE;
}
/**
* clutter_timeline_start:
* @timeline: A #ClutterTimeline
*
* Starts the #ClutterTimeline playing.
**/
void
clutter_timeline_start (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->delay_id || priv->is_playing)
return;
if (priv->duration == 0)
return;
if (priv->delay)
priv->delay_id = clutter_threads_add_timeout (priv->delay,
delay_timeout_func,
timeline);
else
{
priv->msecs_delta = 0;
set_is_playing (timeline, TRUE);
g_signal_emit (timeline, timeline_signals[STARTED], 0);
}
}
/**
* clutter_timeline_pause:
* @timeline: A #ClutterTimeline
*
* Pauses the #ClutterTimeline on current frame
**/
void
clutter_timeline_pause (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->delay_id == 0 && !priv->is_playing)
return;
if (priv->delay_id)
{
g_source_remove (priv->delay_id);
priv->delay_id = 0;
}
priv->msecs_delta = 0;
set_is_playing (timeline, FALSE);
g_signal_emit (timeline, timeline_signals[PAUSED], 0);
}
/**
* clutter_timeline_stop:
* @timeline: A #ClutterTimeline
*
* Stops the #ClutterTimeline and moves to frame 0
**/
void
clutter_timeline_stop (ClutterTimeline *timeline)
{
clutter_timeline_pause (timeline);
clutter_timeline_rewind (timeline);
}
/**
* clutter_timeline_set_loop:
* @timeline: a #ClutterTimeline
* @loop: %TRUE for enable looping
*
* Sets whether @timeline should loop.
*/
void
clutter_timeline_set_loop (ClutterTimeline *timeline,
gboolean loop)
{
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
if (timeline->priv->loop != loop)
{
timeline->priv->loop = loop;
g_object_notify (G_OBJECT (timeline), "loop");
}
}
/**
* clutter_timeline_get_loop:
* @timeline: a #ClutterTimeline
*
* Gets whether @timeline is looping
*
* Return value: %TRUE if the timeline is looping
*/
gboolean
clutter_timeline_get_loop (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), FALSE);
return timeline->priv->loop;
}
/**
* clutter_timeline_rewind:
* @timeline: A #ClutterTimeline
*
* Rewinds #ClutterTimeline to the first frame if its direction is
* %CLUTTER_TIMELINE_FORWARD and the last frame if it is
* %CLUTTER_TIMELINE_BACKWARD.
*/
void
clutter_timeline_rewind (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
clutter_timeline_advance (timeline, 0);
else if (priv->direction == CLUTTER_TIMELINE_BACKWARD)
clutter_timeline_advance (timeline, priv->duration);
}
/**
* clutter_timeline_skip:
* @timeline: A #ClutterTimeline
* @msecs: Amount of time to skip
*
* Advance timeline by the requested time in milliseconds
*/
void
clutter_timeline_skip (ClutterTimeline *timeline,
guint msecs)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
{
priv->elapsed_time += msecs;
if (priv->elapsed_time > priv->duration)
priv->elapsed_time = 1;
}
else if (priv->direction == CLUTTER_TIMELINE_BACKWARD)
{
priv->elapsed_time -= msecs;
if (priv->elapsed_time < 1)
priv->elapsed_time = priv->duration - 1;
}
priv->msecs_delta = 0;
}
/**
* clutter_timeline_advance:
* @timeline: A #ClutterTimeline
* @msecs: Time to advance to
*
* Advance timeline to the requested point. The point is given as a
* time in milliseconds since the timeline started.
*
* <note><para>The @timeline will not emit the #ClutterTimeline::new-frame
* signal for the given time. The first ::new-frame signal after the call to
* clutter_timeline_advance() will be emit the skipped markers.
* </para></note>
*/
void
clutter_timeline_advance (ClutterTimeline *timeline,
guint msecs)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
priv->elapsed_time = CLAMP (msecs, 0, priv->duration);
}
/**
* clutter_timeline_get_elapsed_time:
* @timeline: A #ClutterTimeline
*
* Request the current time position of the timeline.
*
* Return value: current elapsed time in milliseconds.
*/
guint
clutter_timeline_get_elapsed_time (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
return timeline->priv->elapsed_time;
}
/**
* clutter_timeline_is_playing:
* @timeline: A #ClutterTimeline
*
* Queries state of a #ClutterTimeline.
*
* Return value: %TRUE if timeline is currently playing
*/
gboolean
clutter_timeline_is_playing (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), FALSE);
return timeline->priv->is_playing;
}
/**
* clutter_timeline_clone:
* @timeline: #ClutterTimeline to duplicate.
*
* Create a new #ClutterTimeline instance which has property values
* matching that of supplied timeline. The cloned timeline will not
* be started and will not be positioned to the current position of
* @timeline: you will have to start it with clutter_timeline_start().
*
* Return Value: a new #ClutterTimeline, cloned from @timeline
*
* Since: 0.4
*/
ClutterTimeline *
clutter_timeline_clone (ClutterTimeline *timeline)
{
ClutterTimeline *copy;
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), NULL);
copy = g_object_new (CLUTTER_TYPE_TIMELINE,
"duration", clutter_timeline_get_duration (timeline),
"loop", clutter_timeline_get_loop (timeline),
"delay", clutter_timeline_get_delay (timeline),
"direction", clutter_timeline_get_direction (timeline),
NULL);
return copy;
}
/**
* clutter_timeline_new:
* @msecs: Duration of the timeline in milliseconds
*
* Creates a new #ClutterTimeline with a duration of @msecs.
*
* Return value: the newly created #ClutterTimeline instance. Use
* g_object_unref() when done using it
*
* Since: 0.6
*/
ClutterTimeline *
clutter_timeline_new (guint msecs)
{
return g_object_new (CLUTTER_TYPE_TIMELINE,
"duration", msecs,
NULL);
}
/**
* clutter_timeline_get_delay:
* @timeline: a #ClutterTimeline
*
* Retrieves the delay set using clutter_timeline_set_delay().
*
* Return value: the delay in milliseconds.
*
* Since: 0.4
*/
guint
clutter_timeline_get_delay (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
return timeline->priv->delay;
}
/**
* clutter_timeline_set_delay:
* @timeline: a #ClutterTimeline
* @msecs: delay in milliseconds
*
* Sets the delay, in milliseconds, before @timeline should start.
*
* Since: 0.4
*/
void
clutter_timeline_set_delay (ClutterTimeline *timeline,
guint msecs)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->delay != msecs)
{
priv->delay = msecs;
g_object_notify (G_OBJECT (timeline), "delay");
}
}
/**
* clutter_timeline_get_duration:
* @timeline: a #ClutterTimeline
*
* Retrieves the duration of a #ClutterTimeline in milliseconds.
* See clutter_timeline_set_duration().
*
* Return value: the duration of the timeline, in milliseconds.
*
* Since: 0.6
*/
guint
clutter_timeline_get_duration (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
priv = timeline->priv;
return priv->duration;
}
/**
* clutter_timeline_set_duration:
* @timeline: a #ClutterTimeline
* @msecs: duration of the timeline in milliseconds
*
* Sets the duration of the timeline, in milliseconds. The speed
* of the timeline depends on the ClutterTimeline:fps setting.
*
* Since: 0.6
*/
void
clutter_timeline_set_duration (ClutterTimeline *timeline,
guint msecs)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (msecs > 0);
priv = timeline->priv;
if (priv->duration != msecs)
{
priv->duration = msecs;
g_object_notify (G_OBJECT (timeline), "duration");
}
}
/**
* clutter_timeline_get_progress:
* @timeline: a #ClutterTimeline
*
* The position of the timeline in a [0, 1] interval.
*
* Return value: the position of the timeline.
*
* Since: 0.6
*/
gdouble
clutter_timeline_get_progress (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0.0);
priv = timeline->priv;
return (gdouble) priv->elapsed_time / (gdouble) priv->duration;
}
/**
* clutter_timeline_get_direction:
* @timeline: a #ClutterTimeline
*
* Retrieves the direction of the timeline set with
* clutter_timeline_set_direction().
*
* Return value: the direction of the timeline
*
* Since: 0.6
*/
ClutterTimelineDirection
clutter_timeline_get_direction (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline),
CLUTTER_TIMELINE_FORWARD);
return timeline->priv->direction;
}
/**
* clutter_timeline_set_direction:
* @timeline: a #ClutterTimeline
* @direction: the direction of the timeline
*
* Sets the direction of @timeline, either %CLUTTER_TIMELINE_FORWARD or
* %CLUTTER_TIMELINE_BACKWARD.
*
* Since: 0.6
*/
void
clutter_timeline_set_direction (ClutterTimeline *timeline,
ClutterTimelineDirection direction)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->direction != direction)
{
priv->direction = direction;
if (priv->elapsed_time == 0)
priv->elapsed_time = priv->duration;
g_object_notify (G_OBJECT (timeline), "direction");
}
}
/**
* clutter_timeline_get_delta:
* @timeline: a #ClutterTimeline
*
* Retrieves the amount of time elapsed since the last
* ClutterTimeline::new-frame signal.
*
* This function is only useful inside handlers for the ::new-frame
* signal, and its behaviour is undefined if the timeline is not
* playing.
*
* Return value: the amount of time in milliseconds elapsed since the
* last frame
*
* Since: 0.6
*/
guint
clutter_timeline_get_delta (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
if (!clutter_timeline_is_playing (timeline))
return 0;
priv = timeline->priv;
return timeline->priv->msecs_delta;
}
/*
* clutter_timeline_do_tick
* @timeline: a #ClutterTimeline
* @tick_time: time of advance
*
* Advances @timeline based on the time passed in @msecs. This
* function is called by the master clock. The @timeline will use this
* interval to emit the #ClutterTimeline::new-frame signal and
* eventually skip frames.
*/
void
clutter_timeline_do_tick (ClutterTimeline *timeline,
GTimeVal *tick_time)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->waiting_first_tick)
{
priv->last_frame_time = *tick_time;
priv->waiting_first_tick = FALSE;
}
else
{
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)
{
/* Avoid accumulating error */
g_time_val_add (&priv->last_frame_time, msecs * 1000L);
priv->msecs_delta = msecs;
clutter_timeline_do_frame (timeline);
}
}
}
static inline void
clutter_timeline_add_marker_internal (ClutterTimeline *timeline,
const gchar *marker_name,
guint msecs)
{
ClutterTimelinePrivate *priv = timeline->priv;
TimelineMarker *marker;
/* create the hash table that will hold the markers */
if (G_UNLIKELY (priv->markers_by_name == NULL))
priv->markers_by_name = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL,
timeline_marker_free);
marker = g_hash_table_lookup (priv->markers_by_name, marker_name);
if (G_UNLIKELY (marker))
{
g_warning ("A marker named '%s' already exists at time %d",
marker->name,
marker->msecs);
return;
}
marker = timeline_marker_new (marker_name, msecs);
g_hash_table_insert (priv->markers_by_name, marker->name, marker);
}
/**
* clutter_timeline_add_marker_at_time:
* @timeline: a #ClutterTimeline
* @marker_name: the unique name for this marker
* @msecs: position of the marker in milliseconds
*
* Adds a named marker that will be hit when the timeline has been
* running for @msecs milliseconds. Markers are unique string
* identifiers for a given time. Once @timeline reaches
* @msecs, it will emit a ::marker-reached signal for each marker
* attached to that time.
*
* A marker can be removed with clutter_timeline_remove_marker(). The
* timeline can be advanced to a marker using
* clutter_timeline_advance_to_marker().
*
* Since: 0.8
*/
void
clutter_timeline_add_marker_at_time (ClutterTimeline *timeline,
const gchar *marker_name,
guint msecs)
{
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (marker_name != NULL);
g_return_if_fail (msecs <= clutter_timeline_get_duration (timeline));
clutter_timeline_add_marker_internal (timeline, marker_name, msecs);
}
struct CollectMarkersClosure
{
guint msecs;
GArray *markers;
};
static void
collect_markers (const gchar *key,
TimelineMarker *marker,
struct CollectMarkersClosure *data)
{
if (marker->msecs == data->msecs)
{
gchar *name_copy = g_strdup (key);
g_array_append_val (data->markers, name_copy);
}
}
/**
* clutter_timeline_list_markers:
* @timeline: a #ClutterTimeline
* @msecs: the time to check, or -1
* @n_markers: the number of markers returned
*
* Retrieves the list of markers at time @msecs. If @frame_num is a
* negative integer, all the markers attached to @timeline will be
* returned.
*
* Return value: (array zero-terminated=1 length=n_markers): a newly
* allocated, %NULL terminated string array containing the names of
* the markers. Use g_strfreev() when done.
*
* Since: 0.8
*/
gchar **
clutter_timeline_list_markers (ClutterTimeline *timeline,
gint msecs,
gsize *n_markers)
{
ClutterTimelinePrivate *priv;
gchar **retval = NULL;
gsize i;
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), NULL);
priv = timeline->priv;
if (G_UNLIKELY (priv->markers_by_name == NULL))
{
if (n_markers)
*n_markers = 0;
return NULL;
}
if (msecs < 0)
{
GList *markers, *l;
markers = g_hash_table_get_keys (priv->markers_by_name);
retval = g_new0 (gchar*, g_list_length (markers) + 1);
for (i = 0, l = markers; l != NULL; i++, l = l->next)
retval[i] = g_strdup (l->data);
g_list_free (markers);
}
else
{
struct CollectMarkersClosure data;
data.msecs = msecs;
data.markers = g_array_new (TRUE, FALSE, sizeof (gchar *));
g_hash_table_foreach (priv->markers_by_name,
(GHFunc) collect_markers,
&data);
i = data.markers->len;
retval = (gchar **) g_array_free (data.markers, FALSE);
}
if (n_markers)
*n_markers = i;
return retval;
}
/**
* clutter_timeline_advance_to_marker:
* @timeline: a #ClutterTimeline
* @marker_name: the name of the marker
*
* Advances @timeline to the time of the given @marker_name.
*
* <note><para>Like clutter_timeline_advance(), this function will not
* emit the #ClutterTimeline::new-frame for the time where @marker_name
* is set, nor it will emit #ClutterTimeline::marker-reached for
* @marker_name.</para></note>
*
* Since: 0.8
*/
void
clutter_timeline_advance_to_marker (ClutterTimeline *timeline,
const gchar *marker_name)
{
ClutterTimelinePrivate *priv;
TimelineMarker *marker;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (marker_name != NULL);
priv = timeline->priv;
if (G_UNLIKELY (priv->markers_by_name == NULL))
{
g_warning ("No marker named '%s' found.", marker_name);
return;
}
marker = g_hash_table_lookup (priv->markers_by_name, marker_name);
if (!marker)
{
g_warning ("No marker named '%s' found.", marker_name);
return;
}
clutter_timeline_advance (timeline, marker->msecs);
}
/**
* clutter_timeline_remove_marker:
* @timeline: a #ClutterTimeline
* @marker_name: the name of the marker to remove
*
* Removes @marker_name, if found, from @timeline.
*
* Since: 0.8
*/
void
clutter_timeline_remove_marker (ClutterTimeline *timeline,
const gchar *marker_name)
{
ClutterTimelinePrivate *priv;
TimelineMarker *marker;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (marker_name != NULL);
priv = timeline->priv;
if (G_UNLIKELY (priv->markers_by_name == NULL))
{
g_warning ("No marker named '%s' found.", marker_name);
return;
}
marker = g_hash_table_lookup (priv->markers_by_name, marker_name);
if (!marker)
{
g_warning ("No marker named '%s' found.", marker_name);
return;
}
/* this will take care of freeing the marker as well */
g_hash_table_remove (priv->markers_by_name, marker_name);
}
/**
* clutter_timeline_has_marker:
* @timeline: a #ClutterTimeline
* @marker_name: the name of the marker
*
* Checks whether @timeline has a marker set with the given name.
*
* Return value: %TRUE if the marker was found
*
* Since: 0.8
*/
gboolean
clutter_timeline_has_marker (ClutterTimeline *timeline,
const gchar *marker_name)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), FALSE);
g_return_val_if_fail (marker_name != NULL, FALSE);
if (G_UNLIKELY (timeline->priv->markers_by_name == NULL))
return FALSE;
return NULL != g_hash_table_lookup (timeline->priv->markers_by_name,
marker_name);
}
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