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mutter/clutter/clutter-timeline.c
Neil Roberts fa9efe4828 Accumulate small deltas 
The clutter frame source tries to average out the frame deltas so that
if one frame takes 1 interval plus a little bit of extra time then the
next frame will be 1 interval minus that little bit of extra
time. Therefore the deltas can sometimes be less than the frame
interval. ClutterTimeline should accumulate these small differences
otherwise it will end up missing out frames so the total duration of
the timeline will be a lot longer.

For example this was causing test-actors to appear to run very slow.
2009-05-01 15:12:08 +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.
*
* Every timeline shares the same #ClutterTimeoutPool to decrease the
* possibility of starving the main loop when using many timelines
* at the same time; this might cause problems if you are also using
* a library making heavy use of threads with no GLib main loop integration.
*
* In that case you might disable the common timeline pool by setting
* the %CLUTTER_TIMELINE=no-pool environment variable prior to launching
* your application.
*
* One way to visualise a timeline is as a path with marks along its length.
* When creating a timeline of N frames via clutter_timeline_new(), then the
* number of frames can be seen as the paths length, and each unit of
* length (each frame) is delimited by a mark.
*
* For a non looping timeline there will be (N frames + 1) marks along its
* length. For a looping timeline, the two ends are joined with one mark.
* Technically this mark represents two discrete frame numbers, but for a
* looping timeline the start and end frame numbers are considered equivalent.
*
* When you create a timeline it will be initialized so that the current
* frame, as returned by clutter_timeline_get_current_frame(), will be 0.
*
* After starting a timeline, the first timeout is for frame number
* one (notably it isn't zero since there is a delay before the first
* #ClutterTimeline::new-frame signal, so re-asserting the frame number
* zero wouldn't make sense).
*
* This implies that actors you intend to be affected by the timeline's
* progress should be manually primed or positioned for frame zero which
* will be displayed before the first timeout (if you are not careful about
* this point you will likely see flashes of incorrect actor state in your
* program).
*
* For a non looping timeline the last timeout would be for the number
* of frames in the timeline, as returned by clutter_timeline_get_n_frames().
*
* For a looping timeline the timeout for the last frame would be followed
* by a timeout for frame number 1.
*
* There may be times when a system is not able to meet the frame rate
* requested for a timeline, and in this case the frame number will be
* interpolated at the next timeout event. The interpolation is calculated from
* the time that the timeline was started, not from the time of the last
* timeout, so a given timeline should basically elapse in the same - real
* world - time on any given system. An invariable here though is that
* the last frame will always be signaled, but notably frame number 1 can
* be interpolated past and thus never signaled.
*/
#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;
gint current_frame_num;
guint fps;
guint n_frames;
guint delay;
gint skipped_frames;
guint msecs_delta;
guint frame_interval;
GHashTable *markers_by_frame;
GHashTable *markers_by_name;
guint loop : 1;
guint is_playing : 1;
};
typedef struct {
gchar *name;
guint frame_num;
GQuark quark;
} TimelineMarker;
enum
{
PROP_0,
PROP_FPS,
PROP_NUM_FRAMES,
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 frame_num)
{
TimelineMarker *marker = g_slice_new0 (TimelineMarker);
marker->name = g_strdup (name);
marker->quark = g_quark_from_string (marker->name);
marker->frame_num = frame_num;
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_FPS:
clutter_timeline_set_speed (timeline, g_value_get_uint (value));
break;
case PROP_NUM_FRAMES:
clutter_timeline_set_n_frames (timeline, g_value_get_uint (value));
break;
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_FPS:
g_value_set_uint (value, priv->fps);
break;
case PROP_NUM_FRAMES:
g_value_set_uint (value, priv->n_frames);
break;
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_frame)
g_hash_table_destroy (priv->markers_by_frame);
if (priv->markers_by_name)
g_hash_table_destroy (priv->markers_by_name);
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:fps:
*
* Number of frames per second. Because of the nature of the main
* loop used by Clutter, we can only accept a granularity of one
* frame per millisecond.
*
* This value is to be considered a best approximation.
*/
pspec = g_param_spec_uint ("fps",
"Frames Per Second",
"Frames per second",
1, 1000,
60,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_FPS, pspec);
/**
* ClutterTimeline:num-frames:
*
* Total number of frames for the timeline.
*/
pspec = g_param_spec_uint ("num-frames",
"Total number of frames",
"Total number of frames",
1, G_MAXUINT,
1,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_NUM_FRAMES, pspec);
/**
* 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
* @frame_num: the number of the new frame between 0 and
* ClutterTimeline:num-frames
*
* The ::new-frame signal is emitted each time a new frame in the
* timeline is reached.
*/
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
* @frame_num: the frame number
*
* The ::marker-reached signal is emitted each time a timeline
* reaches a marker set with clutter_timeline_add_marker_at_frame()
* or 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_frame (timeline, "foo", 24);
* clutter_timeline_add_marker_at_frame (timeline, "bar", 48);
*
* 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;
ClutterMasterClock *master_clock;
self->priv = priv =
G_TYPE_INSTANCE_GET_PRIVATE (self, CLUTTER_TYPE_TIMELINE,
ClutterTimelinePrivate);
priv->fps = clutter_get_default_frame_rate ();
priv->frame_interval = 1000 / priv->fps;
priv->n_frames = 0;
priv->msecs_delta = 0;
master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_add_timeline (master_clock, self);
}
static void
emit_frame_signal (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv = timeline->priv;
gint i;
g_signal_emit (timeline, timeline_signals[NEW_FRAME], 0,
priv->current_frame_num);
/* shortcircuit here if we don't have any marker installed */
if (priv->markers_by_name == NULL ||
priv->markers_by_frame == NULL)
return;
for (i = priv->skipped_frames; i >= 0; i--)
{
gint frame_num;
GSList *markers, *l;
frame_num = priv->current_frame_num
+ (priv->direction == CLUTTER_TIMELINE_FORWARD ? -i : i);
markers = g_hash_table_lookup (priv->markers_by_frame,
GUINT_TO_POINTER (frame_num));
for (l = markers; l; l = l->next)
{
TimelineMarker *marker = l->data;
CLUTTER_NOTE (SCHEDULER, "Marker '%s' reached", marker->name);
g_signal_emit (timeline, timeline_signals[MARKER_REACHED],
marker->quark,
marker->name,
marker->frame_num);
}
}
}
static gboolean
is_complete (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv = timeline->priv;
return ((priv->direction == CLUTTER_TIMELINE_FORWARD) &&
(priv->current_frame_num >= priv->n_frames)) ||
((priv->direction == CLUTTER_TIMELINE_BACKWARD) &&
(priv->current_frame_num <= 0));
}
static gboolean
clutter_timeline_advance_internal (ClutterTimeline *timeline)
{
ClutterTimelinePrivate *priv;
guint n_frames, speed;
priv = timeline->priv;
g_object_ref (timeline);
CLUTTER_TIMESTAMP (SCHEDULER, "Timeline [%p] activated (cur: %d)\n",
timeline,
priv->current_frame_num);
/* we need to avoid fps > 1000 */
speed = MAX (1000 / priv->fps, 1);
n_frames = priv->msecs_delta / speed;
if (n_frames == 0)
n_frames = 1;
priv->skipped_frames = n_frames - 1;
if (priv->skipped_frames)
CLUTTER_TIMESTAMP (SCHEDULER,
"Timeline [%p], skipping %d frames\n",
timeline,
priv->skipped_frames);
/* Advance frames */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
priv->current_frame_num += n_frames;
else
priv->current_frame_num -= n_frames;
/* If we have not reached the end of the timeline: */
if (!is_complete (timeline))
{
/* Emit the signal */
emit_frame_signal (timeline);
/* 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;
guint overflow_frame_num = priv->current_frame_num;
gint end_frame;
/* Update the current frame number in case the signal handlers
want to take a peek. Don't count skipped frames that run past
the end of the timeline */
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
{
priv->skipped_frames -= priv->current_frame_num - priv->n_frames;
priv->current_frame_num = priv->n_frames;
}
else if (priv->direction == CLUTTER_TIMELINE_BACKWARD)
{
priv->skipped_frames += priv->current_frame_num;
priv->current_frame_num = 0;
}
end_frame = priv->current_frame_num;
/* Emit the signal */
emit_frame_signal (timeline);
/* 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)",
timeline,
priv->current_frame_num,
priv->n_frames,
n_frames - 1);
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 */
priv->is_playing = FALSE;
}
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 vice-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)
{
/* 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;
/* 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
{
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;
priv->is_playing = 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->n_frames == 0)
return;
if (priv->delay)
priv->delay_id = clutter_threads_add_timeout (priv->delay,
delay_timeout_func,
timeline);
else
{
priv->msecs_delta = 0;
priv->is_playing = 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;
priv->is_playing = 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->n_frames);
}
/**
* clutter_timeline_skip:
* @timeline: A #ClutterTimeline
* @n_frames: Number of frames to skip
*
* Advance timeline by the requested number of frames.
*/
void
clutter_timeline_skip (ClutterTimeline *timeline,
guint n_frames)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
if (priv->direction == CLUTTER_TIMELINE_FORWARD)
{
priv->current_frame_num += n_frames;
if (priv->current_frame_num > priv->n_frames)
priv->current_frame_num = 1;
}
else if (priv->direction == CLUTTER_TIMELINE_BACKWARD)
{
priv->current_frame_num -= n_frames;
if (priv->current_frame_num < 1)
priv->current_frame_num = priv->n_frames - 1;
}
priv->msecs_delta = 0;
}
/**
* clutter_timeline_advance:
* @timeline: A #ClutterTimeline
* @frame_num: Frame number to advance to
*
* Advance timeline to the requested frame number.
*
* <note><para>The @timeline will not emit the #ClutterTimeline::new-frame
* signal for @frame_num. The first ::new-frame signal after the call to
* clutter_timeline_advance() will be emitted for a frame following
* @frame_num.</para></note>
*/
void
clutter_timeline_advance (ClutterTimeline *timeline,
guint frame_num)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
priv->current_frame_num = CLAMP (frame_num, 0, priv->n_frames);
}
/**
* clutter_timeline_get_current_frame:
* @timeline: A #ClutterTimeline
*
* Request the current frame number of the timeline.
*
* Return value: current frame number
*/
gint
clutter_timeline_get_current_frame (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
return timeline->priv->current_frame_num;
}
/**
* clutter_timeline_get_n_frames:
* @timeline: A #ClutterTimeline
*
* Request the total number of frames for the #ClutterTimeline.
*
* Return value: the number of frames
*/
guint
clutter_timeline_get_n_frames (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
return timeline->priv->n_frames;
}
/**
* clutter_timeline_set_n_frames:
* @timeline: a #ClutterTimeline
* @n_frames: the number of frames
*
* Sets the total number of frames for @timeline
*/
void
clutter_timeline_set_n_frames (ClutterTimeline *timeline,
guint n_frames)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (n_frames > 0);
priv = timeline->priv;
if (priv->n_frames != n_frames)
{
g_object_freeze_notify (G_OBJECT (timeline));
priv->n_frames = n_frames;
g_object_notify (G_OBJECT (timeline), "num-frames");
g_object_notify (G_OBJECT (timeline), "duration");
g_object_thaw_notify (G_OBJECT (timeline));
}
}
/**
* clutter_timeline_set_speed:
* @timeline: A #ClutterTimeline
* @fps: New speed of timeline as frames per second,
* between 1 and 1000
*
* Sets the speed of @timeline in frames per second.
*/
void
clutter_timeline_set_speed (ClutterTimeline *timeline,
guint fps)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (fps > 0 && fps <= 1000);
priv = timeline->priv;
if (priv->fps != fps)
{
g_object_freeze_notify (G_OBJECT (timeline));
priv->fps = fps;
priv->frame_interval = 1000 / priv->fps;
/* if the timeline is playing restart */
if (priv->is_playing)
clutter_timeline_rewind (timeline);
g_object_notify (G_OBJECT (timeline), "duration");
g_object_notify (G_OBJECT (timeline), "fps");
g_object_thaw_notify (G_OBJECT (timeline));
}
}
/**
* clutter_timeline_get_speed:
* @timeline: a #ClutterTimeline
*
* Gets the frames per second played by @timeline
*
* Return value: the number of frames per second.
*/
guint
clutter_timeline_get_speed (ClutterTimeline *timeline)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
return timeline->priv->fps;
}
/**
* 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,
"fps", clutter_timeline_get_speed (timeline),
"num-frames", clutter_timeline_get_n_frames (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_for_duration:
* @msecs: Duration of the timeline in milliseconds
*
* Creates a new #ClutterTimeline with a duration of @msecs using
* the value of the ClutterTimeline:fps property to compute the
* equivalent number of frames.
*
* Return value: the newly created #ClutterTimeline
*
* Since: 0.6
*/
ClutterTimeline *
clutter_timeline_new_for_duration (guint msecs)
{
return g_object_new (CLUTTER_TYPE_TIMELINE,
"duration", msecs,
NULL);
}
/**
* clutter_timeline_new:
* @n_frames: the number of frames
* @fps: the number of frames per second
*
* Create a new #ClutterTimeline instance.
*
* Return Value: a new #ClutterTimeline
*/
ClutterTimeline*
clutter_timeline_new (guint n_frames,
guint fps)
{
g_return_val_if_fail (n_frames > 0, NULL);
g_return_val_if_fail (fps > 0 && fps <= 1000, NULL);
return g_object_new (CLUTTER_TYPE_TIMELINE,
"fps", fps,
"num-frames", n_frames,
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->n_frames * 1000 / priv->fps;
}
/**
* 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;
guint n_frames;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
n_frames = msecs * priv->fps / 1000;
if (n_frames < 1)
n_frames = 1;
/* this will notify :duration as well */
clutter_timeline_set_n_frames (timeline, n_frames);
}
/**
* 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->current_frame_num / (gdouble) priv->n_frames;
}
/**
* clutter_timeline_get_progressx:
* @timeline: a #ClutterTimeline
*
* Fixed point version of clutter_timeline_get_progress().
*
* Return value: the position of the timeline as a fixed point value
*
* Since: 0.6
*/
CoglFixed
clutter_timeline_get_progressx (ClutterTimeline *timeline)
{
return COGL_FIXED_FROM_DOUBLE (clutter_timeline_get_progress (timeline));
}
/**
* 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->current_frame_num == 0)
priv->current_frame_num = priv->n_frames;
g_object_notify (G_OBJECT (timeline), "direction");
}
}
/**
* clutter_timeline_get_delta:
* @timeline: a #ClutterTimeline
* @msecs: return location for the milliseconds elapsed since the last
* frame, or %NULL
*
* Retrieves the number of frames and 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 frames elapsed since the last one
*
* Since: 0.6
*/
guint
clutter_timeline_get_delta (ClutterTimeline *timeline,
guint *msecs)
{
ClutterTimelinePrivate *priv;
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
if (!clutter_timeline_is_playing (timeline))
{
if (msecs)
*msecs = 0;
return 0;
}
priv = timeline->priv;
if (msecs)
*msecs = timeline->priv->msecs_delta;
return priv->skipped_frames + 1;
}
/*
* clutter_timeline_advance_delta:
* @timeline: a #ClutterTimeline
* @msecs: advance in milliseconds
*
* Advances @timeline by @msecs. This function is called by the master
* clock and it is used to advance a timeline by the amount of milliseconds
* elapsed since the last redraw operation. The @timeline will use this
* interval to emit the #ClutterTimeline::new-frame signal and eventually
* skip frames.
*/
void
clutter_timeline_advance_delta (ClutterTimeline *timeline,
guint msecs)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
priv = timeline->priv;
priv->msecs_delta += msecs;
if (priv->msecs_delta < priv->frame_interval)
return;
else
{
clutter_timeline_advance_internal (timeline);
/* Keep the remainder of the frame time so that it will be
counted towards the next time if the delta is short */
priv->msecs_delta %= priv->frame_interval;
}
}
static inline void
clutter_timeline_add_marker_internal (ClutterTimeline *timeline,
const gchar *marker_name,
guint frame_num)
{
ClutterTimelinePrivate *priv = timeline->priv;
TimelineMarker *marker;
GSList *markers;
/* create the hash tables that will hold the markers */
if (G_UNLIKELY (priv->markers_by_name == NULL ||
priv->markers_by_frame == NULL))
{
priv->markers_by_name = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL,
timeline_marker_free);
priv->markers_by_frame = g_hash_table_new (NULL, NULL);
}
marker = g_hash_table_lookup (priv->markers_by_name, marker_name);
if (G_UNLIKELY (marker))
{
g_warning ("A marker named '%s' already exists on frame %d",
marker->name,
marker->frame_num);
return;
}
marker = timeline_marker_new (marker_name, frame_num);
g_hash_table_insert (priv->markers_by_name, marker->name, marker);
markers = g_hash_table_lookup (priv->markers_by_frame,
GUINT_TO_POINTER (frame_num));
if (!markers)
{
markers = g_slist_prepend (NULL, marker);
g_hash_table_insert (priv->markers_by_frame,
GUINT_TO_POINTER (frame_num),
markers);
}
else
{
markers = g_slist_prepend (markers, marker);
g_hash_table_replace (priv->markers_by_frame,
GUINT_TO_POINTER (frame_num),
markers);
}
}
/**
* clutter_timeline_add_marker_at_frame:
* @timeline: a #ClutterTimeline
* @marker_name: the unique name for this marker
* @frame_num: the marker's frame
*
* Adds a named marker at @frame_num. Markers are unique string identifiers
* for a specific frame. Once @timeline reaches @frame_num, it will emit
* a ::marker-reached signal for each marker attached to that frame.
*
* 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_frame (ClutterTimeline *timeline,
const gchar *marker_name,
guint frame_num)
{
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (marker_name != NULL);
g_return_if_fail (frame_num <= clutter_timeline_get_n_frames (timeline));
clutter_timeline_add_marker_internal (timeline, marker_name, frame_num);
}
/**
* clutter_timeline_add_marker_at_time:
* @timeline: a #ClutterTimeline
* @marker_name: the unique name for this marker
* @msecs: position of the marker in milliseconds
*
* Time-based variant of clutter_timeline_add_marker_at_frame().
*
* Adds a named marker at @msecs.
*
* Since: 0.8
*/
void
clutter_timeline_add_marker_at_time (ClutterTimeline *timeline,
const gchar *marker_name,
guint msecs)
{
guint frame_num;
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));
frame_num = msecs * timeline->priv->fps / 1000;
clutter_timeline_add_marker_internal (timeline, marker_name, frame_num);
}
/**
* clutter_timeline_list_markers:
* @timeline: a #ClutterTimeline
* @frame_num: the frame number to check, or -1
* @n_markers: the number of markers returned
*
* Retrieves the list of markers at @frame_num. 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 frame_num,
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 ||
priv->markers_by_frame == NULL))
{
if (n_markers)
*n_markers = 0;
return NULL;
}
if (frame_num < 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
{
GSList *markers, *l;
markers = g_hash_table_lookup (priv->markers_by_frame,
GUINT_TO_POINTER (frame_num));
retval = g_new0 (gchar*, g_slist_length (markers) + 1);
for (i = 0, l = markers; l != NULL; i++, l = l->next)
retval[i] = g_strdup (((TimelineMarker *) l->data)->name);
}
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 frame of the given @marker_name.
*
* <note><para>Like clutter_timeline_advance(), this function will not
* emit the #ClutterTimeline::new-frame for the frame 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 ||
priv->markers_by_frame == 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->frame_num);
}
/**
* 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;
GSList *markers;
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 ||
priv->markers_by_frame == 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;
}
/* remove from the list of markers at the same frame */
markers = g_hash_table_lookup (priv->markers_by_frame,
GUINT_TO_POINTER (marker->frame_num));
if (G_LIKELY (markers))
{
markers = g_slist_remove (markers, marker);
if (!markers)
{
/* no markers left, remove the slot */
g_hash_table_remove (priv->markers_by_frame,
GUINT_TO_POINTER (marker->frame_num));
}
else
g_hash_table_replace (priv->markers_by_frame,
GUINT_TO_POINTER (marker->frame_num),
markers);
}
else
{
/* uh-oh, dangling marker; this should never happen */
g_warning ("Dangling marker %s at frame %d",
marker->name,
marker->frame_num);
}
/* 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 ||
timeline->priv->markers_by_frame == NULL))
return FALSE;
return NULL != g_hash_table_lookup (timeline->priv->markers_by_name,
marker_name);
}
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