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mutter/clutter/clutter-animator.c
Øyvind Kolås 09d8460a5c animator: s/clutter_animator_run/clutter_animator_start/ 
This is consistent with choice of words in clutter_timeline_start and
makes the API less surprising.
2010-03-02 17:03:03 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2010 Intel Corporation
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Author:
* Øyvind Kolås <pippin@linux.intel.com>
*/
/**
* SECTION:clutter-animator
* @short_description: Multi-actor tweener
* @See_Also: #ClutterAnimatable, #ClutterInterval, #ClutterAlpha,
* #ClutterTimeline
*
* #ClutterAnimator is an object providing declarative animations for
* #GObject properties belonging to one or more #GObject<!-- -->s to
* #ClutterIntervals.
*
* #ClutterAnimator is used to build and describe complex animations
* in terms of "key frames". #ClutterAnimator is meant to be used
* through the #ClutterScript definition format, but it comes with a
* convenience C API.
*
* <refsect2 id="ClutterAnimator-key-frames">
* <title>Key Frames</title>
* <para>Every animation handled by a #ClutterAnimator can be
* described in terms of "key frames". For each #GObject property
* there can be multiple key frames, each one defined by the end
* value for the property to be computed starting from the current
* value to a specific point in time, using a given easing
* mode.</para>
* <para>The point in time is defined using a value representing
* the progress in the normalized interval of [ 0, 1 ]. This maps
* the value returned by clutter_timeline_get_duration().</para>
* <figure id="easing-modes">
* <title>Key Frames</title>
* <graphic fileref="animator-key-frames.png" format="PNG"/>
* </figure>
* <para>In the image above the duration of the animation is
* represented by the blue line. Each key frame is the white dot,
* along with its progress. The red line represents the computed
* function of time given the easing mode.</para>
* </refsect2>
*
* <refsect2 id="ClutterAnimator-script">
* <title>ClutterAnimator description for #ClutterScript</title>
* <para>#ClutterAnimator defines a custom "properties" property
* which allows describing the key frames for objects.</para>
* <para>The "properties" property has the following syntax:</para>
* <informalexample>
* <programlisting>
* {
* "properties" : [
* {
* "object" : &lt;id of an object&gt;,
* "name" : &lt;name of the property&gt;,
* "ease-in" : &lt;boolean&gt;,
* "interpolation" : &lt;#ClutterInterpolation value&gt;,
* "keys" : [
* [ &lt;progress&gt;, &lt;easing mode&gt;, &lt;final value&gt; ]
* ]
* ]
* }
* </programlisting>
* </informalexample>
* <example id="ClutterAnimator-script-example">
* <title>ClutterAnimator definition</title>
* <para>The following JSON fragment defines a #ClutterAnimator
* with the duration of 1 second and operating on the x and y
* properties of a #ClutterActor named "rect-01", with two frames
* for each property. The first frame will linearly move the actor
* from its current position to the 100, 100 position in 20 percent
* of the duration of the animation; the second will using a cubic
* easing to move the actor to the 200, 200 coordinates.</para>
* <programlisting>
* {
* "type" : "ClutterAnimator",
* "duration" : 1000,
* "properties" : [
* {
* "object" : "rect-01",
* "name" : "x",
* "ease-in" : true,
* "keys" : [
* [ 0.2, "linear", 100.0 ],
* [ 1.0, "easeOutCubic", 200.0 ]
* ]
* },
* {
* "object" : "rect-01",
* "name" : "y",
* "ease-in" : true,
* "keys" : [
* [ 0.2, "linear", 100.0 ],
* [ 1.0, "easeOutCubic", 200.0 ]
* ]
* }
* ]
* }
* </programlisting>
* </example>
* </refsect2>
*
* #ClutterAnimator is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gobject/gvaluecollector.h>
#include "clutter-animator.h"
#include "clutter-alpha.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-interval.h"
#include "clutter-private.h"
#include "clutter-script-private.h"
#include "clutter-scriptable.h"
#define CLUTTER_ANIMATOR_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_ANIMATOR, ClutterAnimatorPrivate))
struct _ClutterAnimatorPrivate
{
ClutterTimeline *timeline;
ClutterTimeline *slave_timeline;
GList *score;
GHashTable *properties;
};
struct _ClutterAnimatorKey
{
GObject *object;
const gchar *property_name;
guint mode;
GValue value;
/* normalized progress, between 0.0 and 1.0 */
gdouble progress;
/* back-pointer to the animator which owns the key */
ClutterAnimator *animator;
/* interpolation mode */
ClutterInterpolation interpolation;
/* ease from the current object state into the animation when it starts */
guint ease_in : 1;
/* This key is already being destroyed and shouldn't
* trigger additional weak unrefs
*/
guint is_inert : 1;
gint ref_count;
};
enum
{
PROP_0,
PROP_DURATION,
PROP_TIMELINE
};
static void clutter_scriptable_init (ClutterScriptableIface *iface);
G_DEFINE_TYPE_WITH_CODE (ClutterAnimator,
clutter_animator,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_SCRIPTABLE,
clutter_scriptable_init));
/**
* clutter_animator_new:
*
* Creates a new #ClutterAnimator instance
*
* Return value: a new #ClutterAnimator.
*
* Since: 1.2
*/
ClutterAnimator *
clutter_animator_new (void)
{
return g_object_new (CLUTTER_TYPE_ANIMATOR, NULL);
}
/***/
typedef struct _PropObjectKey {
GObject *object;
const gchar *property_name;
guint mode;
gdouble progress;
} PropObjectKey;
typedef struct _KeyAnimator {
PropObjectKey *key;
ClutterInterval *interval;
ClutterAlpha *alpha;
GList *current;
gdouble start; /* the progress of current */
gdouble end; /* until which progress it is valid */
ClutterInterpolation interpolation;
guint ease_in : 1;
} KeyAnimator;
static PropObjectKey *
prop_actor_key_new (GObject *object,
const gchar *property_name)
{
PropObjectKey *key = g_slice_new0 (PropObjectKey);
key->object = object;
key->property_name = g_intern_string (property_name);
return key;
}
static void
prop_actor_key_free (gpointer key)
{
if (key != NULL)
g_slice_free (PropObjectKey, key);
}
static void
key_animator_free (gpointer key)
{
if (key != NULL)
{
KeyAnimator *key_animator = key;
g_object_unref (key_animator->interval);
g_object_unref (key_animator->alpha);
g_slice_free (KeyAnimator, key_animator);
}
}
static KeyAnimator *
key_animator_new (ClutterAnimator *animator,
PropObjectKey *key,
GType type)
{
KeyAnimator *key_animator = g_slice_new (KeyAnimator);
ClutterInterval *interval = g_object_new (CLUTTER_TYPE_INTERVAL,
"value-type", type,
NULL);
/* we own this interval */
g_object_ref_sink (interval);
key_animator->interval = interval;
key_animator->key = key;
key_animator->alpha = clutter_alpha_new ();
clutter_alpha_set_timeline (key_animator->alpha,
animator->priv->slave_timeline);
/* as well as the alpha */
g_object_ref_sink (key_animator->alpha);
return key_animator;
}
static guint
prop_actor_hash (gconstpointer value)
{
const PropObjectKey *info = value;
return GPOINTER_TO_INT (info->property_name)
^ GPOINTER_TO_INT (info->object);
}
static gboolean
prop_actor_equal (gconstpointer a, gconstpointer b)
{
const PropObjectKey *infoa = a;
const PropObjectKey *infob = b;
/* property name strings are interned so we can just compare pointers */
if (infoa->object == infob->object &&
(infoa->property_name == infob->property_name))
return TRUE;
return FALSE;
}
static gint
sort_actor_prop_progress_func (gconstpointer a,
gconstpointer b)
{
const ClutterAnimatorKey *pa = a;
const ClutterAnimatorKey *pb = b;
if (pa->object == pb->object)
{
gint pdiff = pb->property_name - pa->property_name;
if (pdiff)
return pdiff;
if (pa->progress == pb->progress)
return 0;
if (pa->progress > pb->progress)
return 1;
return -1;
}
return pa->object - pb->object;
}
static gint
sort_actor_prop_func (gconstpointer a,
gconstpointer b)
{
const ClutterAnimatorKey *pa = a;
const ClutterAnimatorKey *pb = b;
if (pa->object == pb->object)
return pa->property_name - pb->property_name;
return pa->object - pb->object;
}
static void
object_disappeared (gpointer data,
GObject *where_the_object_was)
{
clutter_animator_remove_key (data, where_the_object_was, NULL, -1.0);
}
static ClutterAnimatorKey *
clutter_animator_key_new (ClutterAnimator *animator,
GObject *object,
const gchar *property_name,
gdouble progress,
guint mode)
{
ClutterAnimatorKey *animator_key;
animator_key = g_slice_new (ClutterAnimatorKey);
animator_key->ref_count = 1;
animator_key->animator = animator;
animator_key->object = object;
animator_key->mode = mode;
memset (&(animator_key->value), 0, sizeof (GValue));
animator_key->progress = progress;
animator_key->property_name = g_intern_string (property_name);
animator_key->interpolation = CLUTTER_INTERPOLATION_LINEAR;
animator_key->ease_in = FALSE;
animator_key->is_inert = FALSE;
/* keep a weak reference on the animator, so that we can release the
* back-pointer when needed
*/
g_object_weak_ref (object, object_disappeared,
animator_key->animator);
return animator_key;
}
static gpointer
clutter_animator_key_copy (gpointer boxed)
{
ClutterAnimatorKey *key = boxed;
if (key != NULL)
key->ref_count += 1;
return key;
}
static void
clutter_animator_key_free (gpointer boxed)
{
ClutterAnimatorKey *key = boxed;
if (key == NULL)
return;
key->ref_count -= 1;
if (key->ref_count > 0)
return;
if (!key->is_inert)
g_object_weak_unref (key->object, object_disappeared, key->animator);
g_slice_free (ClutterAnimatorKey, key);
}
static void
clutter_animator_finalize (GObject *object)
{
ClutterAnimator *animator = CLUTTER_ANIMATOR (object);
ClutterAnimatorPrivate *priv = animator->priv;
g_list_foreach (priv->score, (GFunc) clutter_animator_key_free, NULL);
g_list_free (priv->score);
priv->score = NULL;
#if 0
for (; priv->score;
priv->score = g_list_remove (priv->score, priv->score->data))
{
clutter_animator_key_free (priv->score->data);
}
#endif
g_object_unref (priv->timeline);
g_object_unref (priv->slave_timeline);
G_OBJECT_CLASS (clutter_animator_parent_class)->finalize (object);
}
/* XXX: this is copied and slightly modified from glib,
* there is only one way to do this. */
static GList *
list_find_custom_reverse (GList *list,
gconstpointer data,
GCompareFunc func)
{
while (list)
{
if (! func (list->data, data))
return list;
list = list->prev;
}
return NULL;
}
/* Ensures that the interval provided by the animator is correct
* for the requested progress value.
*/
static void
animation_animator_ensure_animator (ClutterAnimator *animator,
KeyAnimator *key_animator,
PropObjectKey *key,
gdouble progress)
{
if (progress > key_animator->end)
{
while (progress > key_animator->end)
{
ClutterAnimatorKey *initial_key, *next_key;
GList *initial, *next;
initial = g_list_find_custom (key_animator->current->next,
key,
sort_actor_prop_func);
if (initial)
{
initial_key = initial->data;
clutter_interval_set_initial_value (key_animator->interval,
&initial_key->value);
key_animator->current = initial;
key_animator->start = initial_key->progress;
next = g_list_find_custom (initial->next,
key,
sort_actor_prop_func);
if (next)
{
next_key = next->data;
key_animator->end = next_key->progress;
}
else
{
next_key = initial_key;
key_animator->end = 1.0;
}
clutter_interval_set_final_value (key_animator->interval,
&next_key->value);
if ((clutter_alpha_get_mode (key_animator->alpha) != next_key->mode))
clutter_alpha_set_mode (key_animator->alpha, next_key->mode);
}
else /* no relevant interval */
{
ClutterAnimatorKey *current_key = key_animator->current->data;
clutter_interval_set_initial_value (key_animator->interval,
&current_key->value);
clutter_interval_set_final_value (key_animator->interval,
&current_key->value);
break;
}
}
}
else if (progress < key_animator->start)
{
while (progress < key_animator->start)
{
ClutterAnimatorKey *initial_key, *next_key;
GList *initial;
GList *old = key_animator->current;
initial = list_find_custom_reverse (key_animator->current->prev,
key,
sort_actor_prop_func);
if (initial)
{
initial_key = initial->data;
clutter_interval_set_initial_value (key_animator->interval,
&initial_key->value);
key_animator->current = initial;
key_animator->end = key_animator->start;
key_animator->start = initial_key->progress;
if (old)
{
next_key = old->data;
key_animator->end = next_key->progress;
}
else
{
next_key = initial_key;
key_animator->end = 1.0;
}
clutter_interval_set_final_value (key_animator->interval,
&next_key->value);
if ((clutter_alpha_get_mode (key_animator->alpha) != next_key->mode))
clutter_alpha_set_mode (key_animator->alpha, next_key->mode);
}
else
break;
}
}
}
/* XXX - this might be useful as an internal function exposed somewhere */
static gdouble
cubic_interpolation (const gdouble dx,
const gdouble prev,
const gdouble j,
const gdouble next,
const gdouble nextnext)
{
return (((( - prev + 3 * j - 3 * next + nextnext ) * dx +
( 2 * prev - 5 * j + 4 * next - nextnext ) ) * dx +
( - prev + next ) ) * dx + (j + j) ) / 2.0;
}
/* try to get a floating point key value from a key for a property,
* failing use the closest key in that direction or the starting point.
*/
static gfloat
list_try_get_rel (GList *list,
gint count)
{
ClutterAnimatorKey *key;
GList *iter = list;
GList *best = list;
if (count > 0)
{
while (count -- && iter != NULL)
{
iter = g_list_find_custom (iter->next, list->data,
sort_actor_prop_func);
if (iter != NULL)
best = iter;
}
}
else
{
while (count ++ < 0 && iter != NULL)
{
iter = list_find_custom_reverse (iter->prev, list->data,
sort_actor_prop_func);
if (iter != NULL)
best = iter;
}
}
if (best != NULL && best->data != NULL)
{
key = best->data;
return g_value_get_float (&(key->value));
}
return 0;
}
static void
animation_animator_new_frame (ClutterTimeline *timeline,
gint msecs,
ClutterAnimator *animator)
{
gdouble progress;
GHashTableIter iter;
gpointer key, value;
progress = 1.0 * msecs / clutter_timeline_get_duration (timeline);
/* for each property that is managed figure out the GValue to set,
* avoid creating new ClutterInterval's for each interval crossed
*/
g_hash_table_iter_init (&iter, animator->priv->properties);
key = value = NULL;
while (g_hash_table_iter_next (&iter, &key, &value))
{
PropObjectKey *prop_actor_key = key;
KeyAnimator *key_animator = value;
ClutterAnimatorKey *start_key;
gdouble sub_progress;
animation_animator_ensure_animator (animator, key_animator,
key,
progress);
start_key = key_animator->current->data;
sub_progress = (progress - key_animator->start)
/ (key_animator->end - key_animator->start);
/* do not change values if we're not active yet (delay) */
if (sub_progress >= 0.0 && sub_progress <= 1.0)
{
GValue tmp_value = { 0, };
GType int_type;
g_value_init (&tmp_value, G_VALUE_TYPE (&start_key->value));
clutter_timeline_advance (animator->priv->slave_timeline,
sub_progress * 10000);
sub_progress = clutter_alpha_get_alpha (key_animator->alpha);
int_type = clutter_interval_get_value_type (key_animator->interval);
if (key_animator->interpolation == CLUTTER_INTERPOLATION_CUBIC &&
int_type == G_TYPE_FLOAT)
{
gdouble prev, current, next, nextnext;
gdouble res;
if ((key_animator->ease_in == FALSE ||
(key_animator->ease_in &&
list_find_custom_reverse (key_animator->current->prev,
key_animator->current->data,
sort_actor_prop_func))))
{
current = g_value_get_float (&start_key->value);
prev = list_try_get_rel (key_animator->current, -1);
}
else
{
/* interpolated and easing in */
clutter_interval_get_initial_value (key_animator->interval,
&tmp_value);
prev = current = g_value_get_float (&tmp_value);
}
next = list_try_get_rel (key_animator->current, 1);
nextnext = list_try_get_rel (key_animator->current, 2);
res = cubic_interpolation (sub_progress, prev, current, next,
nextnext);
g_value_set_float (&tmp_value, res);
}
else
clutter_interval_compute_value (key_animator->interval,
sub_progress,
&tmp_value);
g_object_set_property (prop_actor_key->object,
prop_actor_key->property_name,
&tmp_value);
g_value_unset (&tmp_value);
}
}
}
static void
animation_animator_started (ClutterTimeline *timeline,
ClutterAnimator *animator)
{
GList *k;
/* Ensure that animators exist for all involved properties */
for (k = animator->priv->score; k != NULL; k = k->next)
{
ClutterAnimatorKey *key = k->data;
KeyAnimator *key_animator;
PropObjectKey *prop_actor_key;
prop_actor_key = prop_actor_key_new (key->object, key->property_name);
key_animator = g_hash_table_lookup (animator->priv->properties,
prop_actor_key);
if (key_animator)
{
prop_actor_key_free (prop_actor_key);
}
else
{
GObjectClass *klass = G_OBJECT_GET_CLASS (key->object);
GParamSpec *pspec;
pspec = g_object_class_find_property (klass, key->property_name);
key_animator = key_animator_new (animator, prop_actor_key,
G_PARAM_SPEC_VALUE_TYPE (pspec));
g_hash_table_insert (animator->priv->properties,
prop_actor_key,
key_animator);
}
}
/* initialize animator with initial list pointers */
{
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init (&iter, animator->priv->properties);
while (g_hash_table_iter_next (&iter, &key, &value))
{
KeyAnimator *key_animator = value;
ClutterAnimatorKey *initial_key, *next_key;
GList *initial;
GList *next;
initial = g_list_find_custom (animator->priv->score,
key,
sort_actor_prop_func);
g_assert (initial != NULL);
initial_key = initial->data;
clutter_interval_set_initial_value (key_animator->interval,
&initial_key->value);
key_animator->current = initial;
key_animator->start = initial_key->progress;
key_animator->ease_in = initial_key->ease_in;
key_animator->interpolation = initial_key->interpolation;
if (key_animator->ease_in)
{
GValue tmp_value = { 0, };
GType int_type;
int_type = clutter_interval_get_value_type (key_animator->interval);
g_value_init (&tmp_value, int_type);
g_object_get_property (initial_key->object,
initial_key->property_name,
&tmp_value);
clutter_interval_set_initial_value (key_animator->interval,
&tmp_value);
g_value_unset (&tmp_value);
}
next = g_list_find_custom (initial->next, key, sort_actor_prop_func);
if (next)
{
next_key = next->data;
key_animator->end = next_key->progress;
}
else
{
next_key = initial_key;
key_animator->end = 1.0;
}
clutter_interval_set_final_value (key_animator->interval,
&next_key->value);
if ((clutter_alpha_get_mode (key_animator->alpha) != next_key->mode))
clutter_alpha_set_mode (key_animator->alpha, next_key->mode);
}
}
}
/**
* clutter_animator_compute_value:
* @animator: a #ClutterAnimator
* @object: a #GObject
* @property_name: the name of the property on object to check
* @progress: a value between 0.0 and 1.0
* @value: an initialized value to store the computed result
*
* Compute the value for a managed property at a given progress.
*
* If the property is an ease-in property, the current value of the property
* on the object will be used as the starting point for computation.
*
* Return value: %TRUE if the computation yields has a value, otherwise (when
* an error occurs or the progress is before any of the keys) %FALSE is
* returned and the #GValue is left untouched
*
* Since: 1.2
*/
gboolean
clutter_animator_compute_value (ClutterAnimator *animator,
GObject *object,
const gchar *property_name,
gdouble progress,
GValue *value)
{
ClutterAnimatorKey key;
ClutterAnimatorKey *previous;
ClutterAnimatorKey *next = NULL;
GParamSpec *pspec;
GList *initial_l;
GList *previous_l;
GList *next_l;
gboolean ease_in;
ClutterInterpolation interpolation;
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator), FALSE);
g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
g_return_val_if_fail (property_name, FALSE);
g_return_val_if_fail (value, FALSE);
ease_in = clutter_animator_property_get_ease_in (animator, object,
property_name);
interpolation = clutter_animator_property_get_interpolation (animator,
object, property_name);
property_name = g_intern_string (property_name);
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object),
property_name);
key.object = object;
key.property_name = property_name;
initial_l = g_list_find_custom (animator->priv->score, &key,
sort_actor_prop_func);
if (!initial_l)
return FALSE;
/* first find the interval we belong in, that is the first interval
* existing between keys
*/
for (previous_l = initial_l, next_l = previous_l->next ;
previous_l->next ;
previous_l = previous_l->next, next_l = previous_l->next)
{
previous = previous_l->data;
if (next_l)
{
next = next_l->data;
if (next->object != object ||
next->property_name != property_name)
{
next_l = NULL;
next = NULL;
}
}
else
{
next = NULL;
}
if (progress < previous->progress)
{
/* we are before the defined values */
/* value has not been set */
return FALSE;
}
if (!next && previous->progress <= progress)
{
/* we only had one key for this object/property */
/* and we are past it, that is our value */
g_value_copy (&previous->value, value);
return TRUE;
}
if (next->progress >= progress)
{
ClutterInterval *interval;
ClutterAlpha *alpha;
gdouble sub_progress = (progress - previous->progress)
/ (next->progress - previous->progress);
/* this should be our interval */
interval = g_object_new (CLUTTER_TYPE_INTERVAL,
"value-type", pspec->value_type,
NULL);
if (ease_in && previous_l == initial_l)
{
GValue tmp_value = {0, };
g_value_init (&tmp_value, pspec->value_type);
g_object_get_property (object, property_name, &tmp_value);
clutter_interval_set_initial_value (interval, &tmp_value);
g_value_unset (&tmp_value);
}
else
{
clutter_interval_set_initial_value (interval, &previous->value);
}
clutter_interval_set_final_value (interval, &next->value);
alpha = clutter_alpha_new ();
clutter_alpha_set_timeline (alpha,
animator->priv->slave_timeline);
clutter_alpha_set_mode (alpha, next->mode);
clutter_timeline_advance (animator->priv->slave_timeline,
sub_progress * 10000);
sub_progress = clutter_alpha_get_alpha (alpha);
if (interpolation == CLUTTER_INTERPOLATION_CUBIC &&
pspec->value_type == G_TYPE_FLOAT)
{
gdouble prev, current, nextv, nextnext;
gdouble res;
if ((ease_in == FALSE ||
(ease_in &&
list_find_custom_reverse (previous_l->prev,
previous_l->data,
sort_actor_prop_func))))
{
current = g_value_get_float (&previous->value);
prev = list_try_get_rel (previous_l, -1);
}
else
{
/* interpolated and easing in */
GValue tmp_value = {0, };
g_value_init (&tmp_value, pspec->value_type);
clutter_interval_get_initial_value (interval,
&tmp_value);
prev = current = g_value_get_float (&tmp_value);
g_value_unset (&tmp_value);
}
nextv = list_try_get_rel (previous_l, 1);
nextnext = list_try_get_rel (previous_l, 2);
res = cubic_interpolation (sub_progress, prev, current, nextv,
nextnext);
g_value_set_float (value, res);
}
else
clutter_interval_compute_value (interval,
sub_progress,
value);
g_object_ref_sink (interval);
g_object_unref (interval);
g_object_ref_sink (alpha);
g_object_unref (alpha);
return TRUE;
}
}
/* We're at, or past the end, use the last value */
g_value_copy (&next->value, value);
return TRUE;
}
/**
* clutter_animator_set_timeline:
* @animator: a #ClutterAnimator
* @timeline: a #ClutterTimeline
*
* Sets an external timeline that will be used for driving the animation
*
* Since: 1.2
*/
void
clutter_animator_set_timeline (ClutterAnimator *animator,
ClutterTimeline *timeline)
{
ClutterAnimatorPrivate *priv;
g_return_if_fail (CLUTTER_IS_ANIMATOR (animator));
priv = animator->priv;
if (priv->timeline != NULL)
{
g_signal_handlers_disconnect_by_func (priv->timeline,
animation_animator_new_frame,
animator);
g_signal_handlers_disconnect_by_func (priv->timeline,
animation_animator_started,
animator);
g_object_unref (priv->timeline);
}
priv->timeline = timeline;
if (timeline != NULL)
{
g_object_ref_sink (priv->timeline);
g_signal_connect (priv->timeline, "new-frame",
G_CALLBACK (animation_animator_new_frame),
animator);
g_signal_connect (priv->timeline, "started",
G_CALLBACK (animation_animator_started),
animator);
}
}
/**
* clutter_animator_get_timeline:
* @animator: a #ClutterAnimator
*
* Get the timeline hooked up for driving the #ClutterAnimator
*
* Return value: (transfer none): the #ClutterTimeline that drives the animator
*
* Since: 1.2
*/
ClutterTimeline *
clutter_animator_get_timeline (ClutterAnimator *animator)
{
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator), NULL);
return animator->priv->timeline;
}
/**
* clutter_animator_start:
* @animator: a #ClutterAnimator
*
* Start the ClutterAnimator, this is a thin wrapper that rewinds
* and starts the animators current timeline.
*
* Return value: the #ClutterTimeline that drives the animator.
*
* Since: 1.2
*/
ClutterTimeline *
clutter_animator_start (ClutterAnimator *animator)
{
ClutterAnimatorPrivate *priv;
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator), NULL);
priv = animator->priv;
clutter_timeline_rewind (priv->timeline);
clutter_timeline_start (priv->timeline);
return priv->timeline;
}
/**
* clutter_animator_set_duration:
* @animator: a #ClutterAnimator
* @duration: milliseconds a run of the animator should last.
*
* Runs the timeline of the #ClutterAnimator with a duration in msecs
* as specified.
*
* Since: 1.2
*/
void
clutter_animator_set_duration (ClutterAnimator *animator,
guint duration)
{
g_return_if_fail (CLUTTER_IS_ANIMATOR (animator));
clutter_timeline_set_duration (animator->priv->timeline, duration);
}
/**
* clutter_animator_get_duration:
* @animator: a #ClutterAnimator
*
* Retrieves the current duration of an animator
*
* Return value: the duration of the animation, in milliseconds
*
* Since: 1.2
*/
guint
clutter_animator_get_duration (ClutterAnimator *animator)
{
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator), 0);
return clutter_timeline_get_duration (animator->priv->timeline);
}
/**
* clutter_animator_set:
* @animator: a #ClutterAnimator
* @first_object: a #GObject
* @first_property_name: the property to specify a key for
* @first_mode: the id of the alpha function to use
* @first_progress: at which stage of the animation this value applies; the
* range is a normalized floating point value between 0 and 1
* @VarArgs: the value first_property_name should have for first_object
* at first_progress, followed by more (object, property_name, mode,
* progress, value) tuples, followed by %NULL
*
* Adds multiple keys to a #ClutterAnimator, specifying the value a given
* property should have at a given progress of the animation. The mode
* specified is the mode used when going to this key from the previous key of
* the @property_name
*
* If a given (object, property, progress) tuple already exist the mode and
* value will be replaced with the new values.
*
* Since: 1.2
*/
void
clutter_animator_set (ClutterAnimator *animator,
gpointer first_object,
const gchar *first_property_name,
guint first_mode,
gdouble first_progress,
...)
{
GObject *object;
const gchar *property_name;
guint mode;
gdouble progress;
va_list args;
g_return_if_fail (CLUTTER_IS_ANIMATOR (animator));
object = first_object;
property_name = first_property_name;
mode = first_mode;
progress = first_progress;
va_start (args, first_progress);
while (object != NULL)
{
GParamSpec *pspec;
GObjectClass *klass;
GValue value = { 0, };
gchar *error = NULL;
g_return_if_fail (object);
g_return_if_fail (property_name);
klass = G_OBJECT_GET_CLASS (object);
pspec = g_object_class_find_property (klass, property_name);
if (!pspec)
{
g_warning ("Cannot bind property '%s': object of type '%s' "
"do not have this property",
property_name, G_OBJECT_TYPE_NAME (object));
break;
}
#if GLIB_CHECK_VERSION (2, 23, 2)
G_VALUE_COLLECT_INIT (&value, G_PARAM_SPEC_VALUE_TYPE (pspec),
args, 0,
&error);
#else
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
G_VALUE_COLLECT (&value, args, 0, &error);
#endif /* GLIB_CHECK_VERSION (2, 23, 2) */
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
break;
}
clutter_animator_set_key (animator,
object,
property_name,
mode,
progress,
&value);
object= va_arg (args, GObject *);
if (object)
{
property_name = va_arg (args, gchar*);
if (!property_name)
{
g_warning ("%s: expected a property name", G_STRLOC);
break;
}
mode = va_arg (args, guint);
progress = va_arg (args, gdouble);
}
}
va_end (args);
}
static inline void
clutter_animator_set_key_internal (ClutterAnimator *animator,
ClutterAnimatorKey *key)
{
ClutterAnimatorPrivate *priv = animator->priv;
GList *old_item;
old_item = g_list_find_custom (priv->score, key,
sort_actor_prop_progress_func);
/* replace the key if we already have a similar one */
if (old_item != NULL)
{
ClutterAnimatorKey *old_key = old_item->data;
clutter_animator_key_free (old_key);
priv->score = g_list_remove (priv->score, old_key);
}
priv->score = g_list_insert_sorted (priv->score, key,
sort_actor_prop_progress_func);
}
/**
* clutter_animator_set_key:
* @animator: a #ClutterAnimator
* @object: a #GObject
* @property_name: the property to specify a key for
* @mode: the id of the alpha function to use
* @progress: the normalized range at which stage of the animation this
* value applies
* @value: the value property_name should have at progress.
*
* Sets a single key in the #ClutterAnimator for the @property_name of
* @object at @progress.
*
* See also: clutter_animator_set()
*
* Return value: (transfer none): The animator instance
*
* Since: 1.2
*/
ClutterAnimator *
clutter_animator_set_key (ClutterAnimator *animator,
GObject *object,
const gchar *property_name,
guint mode,
gdouble progress,
const GValue *value)
{
ClutterAnimatorKey *animator_key;
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator), NULL);
g_return_val_if_fail (G_IS_OBJECT (object), NULL);
g_return_val_if_fail (property_name, NULL);
g_return_val_if_fail (value, NULL);
property_name = g_intern_string (property_name);
animator_key = clutter_animator_key_new (animator,
object, property_name,
progress,
mode);
g_value_init (&animator_key->value, G_VALUE_TYPE (value));
g_value_copy (value, &animator_key->value);
clutter_animator_set_key_internal (animator, animator_key);
return animator;
}
/**
* clutter_animator_get_keys:
* @animator: a #ClutterAnimator instance
* @object: (allow-none): a #GObject to search for, or %NULL for all objects
* @property_name: (allow-none): a specific property name to query for,
* or %NULL for all properties
* @progress: a specific progress to search for, or a negative value for all
* progresses
*
* Returns a list of pointers to opaque structures with accessor functions
* that describe the keys added to an animator.
*
* Return value: (transfer container) (element-type ClutterAnimatorKey): a
* list of #ClutterAnimatorKey<!-- -->s; the contents of the list are owned
* by the #ClutterAnimator, but you should free the returned list when done,
* using g_list_free()
*
* Since: 1.2
*/
GList *
clutter_animator_get_keys (ClutterAnimator *animator,
GObject *object,
const gchar *property_name,
gdouble progress)
{
GList *keys = NULL;
GList *k;
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator), NULL);
g_return_val_if_fail (object == NULL || G_IS_OBJECT (object), NULL);
property_name = g_intern_string (property_name);
for (k = animator->priv->score; k; k = k->next)
{
ClutterAnimatorKey *key = k->data;
if ((object == NULL || (object == key->object)) &&
(property_name == NULL || ((property_name == key->property_name))) &&
(progress < 0 || (progress == key->progress)))
{
keys = g_list_prepend (keys, key);
}
}
return g_list_reverse (keys);
}
/**
* clutter_animator_remove_key:
* @animator: a #ClutterAnimator
* @object: (allow-none): a #GObject to search for, or %NULL for all
* @property_name: (allow-none): a specific property name to query for,
* or %NULL for all
* @progress: a specific progress to search for or a negative value
* for all
*
* Removes all keys matching the conditions specificed in the arguments.
*
* Since: 1.2
*/
void
clutter_animator_remove_key (ClutterAnimator *animator,
GObject *object,
const gchar *property_name,
gdouble progress)
{
ClutterAnimatorPrivate *priv;
GList *k;
g_return_if_fail (CLUTTER_IS_ANIMATOR (animator));
g_return_if_fail (object == NULL || G_IS_OBJECT (object));
property_name = g_intern_string (property_name);
priv = animator->priv;
for (k = priv->score; k != NULL; k = k->next)
{
ClutterAnimatorKey *key = k->data;
if ((object == NULL || (object == key->object)) &&
(property_name == NULL || ((property_name == key->property_name))) &&
(progress < 0 || (progress == key->progress))
)
{
key->is_inert = TRUE;
clutter_animator_key_free (key);
/* FIXME: non performant since we reiterate the list many times */
k = priv->score = g_list_remove (priv->score, key);
}
}
if (object)
{
GHashTableIter iter;
gpointer key, value;
again:
g_hash_table_iter_init (&iter, priv->properties);
while (g_hash_table_iter_next (&iter, &key, &value))
{
PropObjectKey *prop_actor_key = key;
if (prop_actor_key->object == object)
{
g_hash_table_remove (priv->properties, key);
goto again;
}
}
}
}
typedef struct _ParseClosure {
ClutterAnimator *animator;
ClutterScript *script;
GValue *value;
gboolean result;
} ParseClosure;
static ClutterInterpolation
resolve_interpolation (JsonNode *node)
{
if ((JSON_NODE_TYPE (node) != JSON_NODE_VALUE))
return CLUTTER_INTERPOLATION_LINEAR;
if (json_node_get_value_type (node) == G_TYPE_INT64)
{
return json_node_get_int (node);
}
else if (json_node_get_value_type (node) == G_TYPE_STRING)
{
const gchar *str = json_node_get_string (node);
gboolean res;
gint enum_value;
res = clutter_script_enum_from_string (CLUTTER_TYPE_INTERPOLATION,
str,
&enum_value);
if (res)
return enum_value;
}
return CLUTTER_INTERPOLATION_LINEAR;
}
static void
parse_animator_property (JsonArray *array,
guint index_,
JsonNode *element,
gpointer data)
{
ParseClosure *clos = data;
JsonObject *object;
JsonArray *keys;
GObject *gobject;
const gchar *id, *pname;
GObjectClass *klass;
GParamSpec *pspec;
GSList *valid_keys = NULL;
GList *k;
ClutterInterpolation interpolation = CLUTTER_INTERPOLATION_LINEAR;
gboolean ease_in = FALSE;
if (JSON_NODE_TYPE (element) != JSON_NODE_OBJECT)
{
g_warning ("The 'properties' member of a ClutterAnimator description "
"should be an array of objects, but the element %d of the "
"array is of type '%s'. The element will be ignored.",
index_,
json_node_type_name (element));
return;
}
object = json_node_get_object (element);
if (!json_object_has_member (object, "object") ||
!json_object_has_member (object, "name") ||
!json_object_has_member (object, "keys"))
{
g_warning ("The property description at index %d is missing one of "
"the mandatory fields: object, name and keys",
index_);
return;
}
id = json_object_get_string_member (object, "object");
gobject = clutter_script_get_object (clos->script, id);
if (gobject == NULL)
{
g_warning ("No object with id '%s' has been defined.", id);
return;
}
pname = json_object_get_string_member (object, "name");
klass = G_OBJECT_GET_CLASS (gobject);
pspec = g_object_class_find_property (klass, pname);
if (pspec == NULL)
{
g_warning ("The object of type '%s' and name '%s' has no "
"property named '%s'",
G_OBJECT_TYPE_NAME (gobject),
id,
pname);
return;
}
if (json_object_has_member (object, "ease-in"))
ease_in = json_object_get_boolean_member (object, "ease-in");
if (json_object_has_member (object, "interpolation"))
{
JsonNode *node = json_object_get_member (object, "interpolation");
interpolation = resolve_interpolation (node);
}
keys = json_object_get_array_member (object, "keys");
if (keys == NULL)
{
g_warning ("The property description at index %d has an invalid "
"key field of type '%s' when an array was expected.",
index_,
json_node_type_name (json_object_get_member (object, "keys")));
return;
}
if (G_IS_VALUE (clos->value))
valid_keys = g_slist_reverse (g_value_get_pointer (clos->value));
else
g_value_init (clos->value, G_TYPE_POINTER);
for (k = json_array_get_elements (keys);
k != NULL;
k = k->next)
{
JsonNode *node = k->data;
JsonArray *key = json_node_get_array (node);
ClutterAnimatorKey *animator_key;
gdouble progress;
gulong mode;
gboolean res;
progress = json_array_get_double_element (key, 0);
mode = clutter_script_resolve_animation_mode (json_array_get_element (key, 1));
animator_key = clutter_animator_key_new (clos->animator,
gobject,
pname,
progress,
mode);
res = clutter_script_parse_node (clos->script,
&(animator_key->value),
pname,
json_array_get_element (key, 2),
pspec);
if (!res)
{
g_warning ("Unable to parse the key value for the "
"property '%s' (progress: %.2f) at index %d",
pname,
progress,
index_);
continue;
}
animator_key->ease_in = ease_in;
animator_key->interpolation = interpolation;
valid_keys = g_slist_prepend (valid_keys, animator_key);
}
g_value_set_pointer (clos->value, g_slist_reverse (valid_keys));
clos->result = TRUE;
}
static gboolean
clutter_animator_parse_custom_node (ClutterScriptable *scriptable,
ClutterScript *script,
GValue *value,
const gchar *name,
JsonNode *node)
{
ParseClosure parse_closure;
if (strcmp (name, "properties") != 0)
return FALSE;
if (JSON_NODE_TYPE (node) != JSON_NODE_ARRAY)
return FALSE;
parse_closure.animator = CLUTTER_ANIMATOR (scriptable);
parse_closure.script = script;
parse_closure.value = value;
parse_closure.result = FALSE;
json_array_foreach_element (json_node_get_array (node),
parse_animator_property,
&parse_closure);
/* we return TRUE if we had at least one key parsed */
return parse_closure.result;
}
static void
clutter_animator_set_custom_property (ClutterScriptable *scriptable,
ClutterScript *script,
const gchar *name,
const GValue *value)
{
if (strcmp (name, "properties") == 0)
{
ClutterAnimator *animator = CLUTTER_ANIMATOR (scriptable);
GSList *keys = g_value_get_pointer (value);
GSList *k;
for (k = keys; k != NULL; k = k->next)
clutter_animator_set_key_internal (animator, k->data);
g_slist_free (keys);
}
else
g_object_set_property (G_OBJECT (scriptable), name, value);
}
static void
clutter_scriptable_init (ClutterScriptableIface *iface)
{
iface->parse_custom_node = clutter_animator_parse_custom_node;
iface->set_custom_property = clutter_animator_set_custom_property;
}
static void
clutter_animator_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterAnimator *self = CLUTTER_ANIMATOR (gobject);
switch (prop_id)
{
case PROP_DURATION:
clutter_animator_set_duration (self, g_value_get_uint (value));
break;
case PROP_TIMELINE:
clutter_animator_set_timeline (self, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_animator_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterAnimatorPrivate *priv = CLUTTER_ANIMATOR (gobject)->priv;
switch (prop_id)
{
case PROP_DURATION:
g_value_set_uint (value, clutter_timeline_get_duration (priv->timeline));
break;
case PROP_TIMELINE:
g_value_set_object (value, priv->timeline);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_animator_class_init (ClutterAnimatorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GParamSpec *pspec;
g_type_class_add_private (klass, sizeof (ClutterAnimatorPrivate));
gobject_class->set_property = clutter_animator_set_property;
gobject_class->get_property = clutter_animator_get_property;
gobject_class->finalize = clutter_animator_finalize;
/**
* ClutterAnimator:duration:
*
* The duration of the #ClutterTimeline used by the #ClutterAnimator
* to drive the animation
*
* Since: 1.2
*/
pspec = g_param_spec_uint ("duration",
"Duration",
"The duration of the animation",
0, G_MAXUINT,
2000,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_DURATION, pspec);
/**
* ClutterAnimator:timeline:
*
* The #ClutterTimeline used by the #ClutterAnimator to drive the
* animation
*
* Since: 1.2
*/
pspec = g_param_spec_object ("timeline",
"Timeline",
"The timeline of the animation",
CLUTTER_TYPE_TIMELINE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_TIMELINE, pspec);
}
static void
clutter_animator_init (ClutterAnimator *animator)
{
ClutterAnimatorPrivate *priv;
animator->priv = priv = CLUTTER_ANIMATOR_GET_PRIVATE (animator);
priv->properties = g_hash_table_new_full (prop_actor_hash,
prop_actor_equal,
prop_actor_key_free,
key_animator_free);
clutter_animator_set_timeline (animator, clutter_timeline_new (2000));
priv->slave_timeline = clutter_timeline_new (10000);
g_object_ref_sink (priv->slave_timeline);
}
/**
* clutter_animator_property_get_ease_in:
* @animator: a #ClutterAnimatorKey
* @object: a #GObject
* @property_name: the name of a property on object
*
* Checks if a property value is to be eased into the animation.
*
* Return value: %TRUE if the property is eased in
*
* Since: 1.2
*/
gboolean
clutter_animator_property_get_ease_in (ClutterAnimator *animator,
GObject *object,
const gchar *property_name)
{
ClutterAnimatorKey key, *initial_key;
GList *initial;
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator), FALSE);
g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
g_return_val_if_fail (property_name, FALSE);
key.object = object;
key.property_name = g_intern_string (property_name);
initial = g_list_find_custom (animator->priv->score, &key,
sort_actor_prop_func);
if (initial != NULL)
{
initial_key = initial->data;
return initial_key->ease_in;
}
return FALSE;
}
/**
* clutter_animator_property_set_ease_in:
* @animator: a #ClutterAnimatorKey
* @object: a #GObject
* @property_name: the name of a property on object
* @ease_in: we are going to be easing in this property
*
* Sets whether a property value is to be eased into the animation.
*
* Since: 1.2
*/
void
clutter_animator_property_set_ease_in (ClutterAnimator *animator,
GObject *object,
const gchar *property_name,
gboolean ease_in)
{
ClutterAnimatorKey key, *initial_key;
GList *initial;
g_return_if_fail (CLUTTER_IS_ANIMATOR (animator));
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (property_name);
key.object = object;
key.property_name = g_intern_string (property_name);
initial = g_list_find_custom (animator->priv->score, &key,
sort_actor_prop_func);
if (initial)
{
initial_key = initial->data;
initial_key->ease_in = ease_in;
}
else
g_warning ("The animator has no object of type '%s' with a "
"property named '%s'",
G_OBJECT_TYPE_NAME (object),
property_name);
}
/**
* clutter_animator_property_get_interpolation:
* @animator: a #ClutterAnimatorKey
* @object: a #GObject
* @property_name: the name of a property on object
*
* Get the interpolation used by animator for a property on a particular
* object.
*
* Returns: a ClutterInterpolation value.
* Since: 1.2
*/
ClutterInterpolation
clutter_animator_property_get_interpolation (ClutterAnimator *animator,
GObject *object,
const gchar *property_name)
{
GList *initial;
ClutterAnimatorKey key, *initial_key;
g_return_val_if_fail (CLUTTER_IS_ANIMATOR (animator),
CLUTTER_INTERPOLATION_LINEAR);
g_return_val_if_fail (G_IS_OBJECT (object),
CLUTTER_INTERPOLATION_LINEAR);
g_return_val_if_fail (property_name,
CLUTTER_INTERPOLATION_LINEAR);
key.object = object;
key.property_name = g_intern_string (property_name);
initial = g_list_find_custom (animator->priv->score, &key,
sort_actor_prop_func);
if (initial)
{
initial_key = initial->data;
return initial_key->interpolation;
}
return CLUTTER_INTERPOLATION_LINEAR;
}
/**
* clutter_animator_property_set_interpolation:
* @animator: a #ClutterAnimatorKey
* @object: a #GObject
* @property_name: the name of a property on object
* @interpolation: the #ClutterInterpolation to use
*
* Set the interpolation method to use, %CLUTTER_INTERPOLATION_LINEAR causes
* the values to linearly change between the values, and
* %CLUTTER_INTERPOLATION_CUBIC causes the values to smoothly change between
* the values.
*
* Since: 1.2
*/
void
clutter_animator_property_set_interpolation (ClutterAnimator *animator,
GObject *object,
const gchar *property_name,
ClutterInterpolation interpolation)
{
GList *initial;
ClutterAnimatorKey key, *initial_key;
g_return_if_fail (CLUTTER_IS_ANIMATOR (animator));
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (property_name);
key.object = object;
key.property_name = g_intern_string (property_name);
initial = g_list_find_custom (animator->priv->score, &key,
sort_actor_prop_func);
if (initial)
{
initial_key = initial->data;
initial_key->interpolation = interpolation;
}
}
GType
clutter_animator_key_get_type (void)
{
static GType our_type = 0;
if (!our_type)
our_type = g_boxed_type_register_static (I_("ClutterAnimatorKey"),
clutter_animator_key_copy,
clutter_animator_key_free);
return our_type;
}
/**
* clutter_animator_key_get_object:
* @key: a #ClutterAnimatorKey
*
* Retrieves the object a key applies to.
*
* Return value: (transfer none): the object an animator_key exist for.
*
* Since: 1.2
*/
GObject *
clutter_animator_key_get_object (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (key != NULL, NULL);
return key->object;
}
/**
* clutter_animator_key_get_property_name:
* @key: a #ClutterAnimatorKey
*
* Retrieves the name of the property a key applies to.
*
* Return value: the name of the property an animator_key exist for.
*
* Since: 1.2
*/
G_CONST_RETURN gchar *
clutter_animator_key_get_property_name (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (key != NULL, NULL);
return key->property_name;
}
/**
* clutter_animator_key_get_property_type:
* @key: a #ClutterAnimatorKey
*
* Retrieves the #GType of the property a key applies to
*
* You can use this type to initialize the #GValue to pass to
* clutter_animator_key_get_value()
*
* Return value: the #GType of the property
*
* Since: 1.2
*/
GType
clutter_animator_key_get_property_type (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (key != NULL, G_TYPE_INVALID);
return G_VALUE_TYPE (&key->value);
}
/**
* clutter_animator_key_get_mode:
* @key: a #ClutterAnimatorKey
*
* Retrieves the mode of a #ClutterAnimator key, for the first key of a
* property for an object this represents the whether the animation is
* open ended and or curved for the remainding keys for the property it
* represents the easing mode.
*
* Return value: the mode of a #ClutterAnimatorKey
*
* Since: 1.2
*/
gulong
clutter_animator_key_get_mode (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (key != NULL, 0);
return key->mode;
}
/**
* clutter_animator_key_get_progress:
* @key: a #ClutterAnimatorKey
*
* Retrieves the progress of an clutter_animator_key
*
* Return value: the progress defined for a #ClutterAnimator key.
*
* Since: 1.2
*/
gdouble
clutter_animator_key_get_progress (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (key != NULL, 0.0);
return key->progress;
}
/**
* clutter_animator_key_get_value:
* @key: a #ClutterAnimatorKey
* @value: a #GValue initialized with the correct type for the animator key
*
* Retrieves a copy of the value for a #ClutterAnimatorKey.
*
* The passed in #GValue needs to be already initialized for the value
* type of the key or to a type that allow transformation from the value
* type of the key.
*
* Use g_value_unset() when done.
*
* Return value: %TRUE if the passed #GValue was successfully set, and
* %FALSE otherwise
*
* Since: 1.2
*/
gboolean
clutter_animator_key_get_value (const ClutterAnimatorKey *key,
GValue *value)
{
GType gtype;
g_return_val_if_fail (key != NULL, FALSE);
gtype = G_VALUE_TYPE (&key->value);
if (g_value_type_compatible (gtype, G_VALUE_TYPE (value)))
{
g_value_copy (&key->value, value);
return TRUE;
}
if (g_value_type_transformable (gtype, G_VALUE_TYPE (value)))
{
if (g_value_transform (&key->value, value))
return TRUE;
}
return FALSE;
}
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