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mutter/clutter/clutter-alpha.c
Emmanuele Bassi 6575f25e32 docs: "Soft" deprecation of ClutterAlpha 
We cannot deprecate ClutterAlpha yet. We cannot also implement
ClutterAlpha in terms of ClutterTimeline, because multiple Alpha
instances can be attached to the same Timeline. So we can start
with a "soft" deprecation: just a warning in the documentation
stating that ClutterAlpha will be deprecated, and removed, in the
future, and that newly-written code should use ClutterTimeline
instead.
2012-02-23 11:23:15 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
* Jorn Baayen <jorn@openedhand.com>
* Emmanuele Bassi <ebassi@openedhand.com>
* Tomas Frydrych <tf@openedhand.com>
*
* Copyright (C) 2006, 2007, 2008 OpenedHand
* Copyright (C) 2009, 2010 Intel Corp.
*
* 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/>.
*/
/**
* SECTION:clutter-alpha
* @short_description: A class for calculating a value as a function of time
*
* #ClutterAlpha is a class for calculating an floating point value
* dependent only on the position of a #ClutterTimeline.
*
* <warning>For newly written code, it is recommended to use the
* #ClutterTimeline:progress-mode property of #ClutterTimeline, or the
* clutter_timeline_set_progress_func() function instead of #ClutterAlpha.
* The #ClutterAlpha class will be deprecated in the future, and will not
* be available any more in the next major version of Clutter.</warning>
*
* A #ClutterAlpha binds a #ClutterTimeline to a progress function which
* translates the time T into an adimensional factor alpha. The factor can
* then be used to drive a #ClutterBehaviour, which will translate the
* alpha value into something meaningful for a #ClutterActor.
*
* You should provide a #ClutterTimeline and bind it to the #ClutterAlpha
* instance using clutter_alpha_set_timeline(). You should also set an
* "animation mode", either by using the #ClutterAnimationMode values that
* Clutter itself provides or by registering custom functions using
* clutter_alpha_register_func().
*
* Instead of a #ClutterAnimationMode you may provide a function returning
* the alpha value depending on the progress of the timeline, using
* clutter_alpha_set_func() or clutter_alpha_set_closure(). The alpha
* function will be executed each time a new frame in the #ClutterTimeline
* is reached.
*
* Since the alpha function is controlled by the timeline instance, you can
* pause, stop or resume the #ClutterAlpha from calling the alpha function by
* using the appropriate functions of the #ClutterTimeline object.
*
* #ClutterAlpha is used to "drive" a #ClutterBehaviour instance, and it
* is internally used by the #ClutterAnimation API.
*
* <figure id="easing-modes">
* <title>Easing modes provided by Clutter</title>
* <graphic fileref="easing-modes.png" format="PNG"/>
* </figure>
*
* <refsect2 id="ClutterAlpha-script">
* <title>ClutterAlpha custom properties for #ClutterScript</title>
* <para>#ClutterAlpha defines a custom "function" property for
* #ClutterScript which allows to reference a custom alpha function
* available in the source code. Setting the "function" property
* is equivalent to calling clutter_alpha_set_func() with the
* specified function name. No user data or #GDestroyNotify is
* available to be passed.</para>
* <example id="ClutterAlpha-script-example">
* <title>Defining a ClutterAlpha in ClutterScript</title>
* <para>The following JSON fragment defines a #ClutterAlpha
* using a #ClutterTimeline with id "sine-timeline" and an alpha
* function called <function>my_sine_alpha</function>. The defined
* #ClutterAlpha instance can be reused in multiple #ClutterBehaviour
* definitions or for #ClutterAnimation definitions.</para>
* <programlisting><![CDATA[
* {
* "id" : "sine-alpha",
* "timeline" : {
* "id" : "sine-timeline",
* "duration" : 500,
* "loop" : true
* },
* "function" : "my_sine_alpha"
* }
* ]]></programlisting>
* </example>
* <para>For the way to define the #ClutterAlpha:mode property
* inside a ClutterScript fragment, see <link
* linkend="clutter-AnimationMode-Script">the corresponding section</link>
* in #ClutterAnimation.</para>
* </refsect2>
*
* Since: 0.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <gmodule.h>
#include "clutter-alpha.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-easing.h"
#include "clutter-main.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#include "clutter-scriptable.h"
#include "clutter-script-private.h"
static void clutter_scriptable_iface_init (ClutterScriptableIface *iface);
G_DEFINE_TYPE_WITH_CODE (ClutterAlpha,
clutter_alpha,
G_TYPE_INITIALLY_UNOWNED,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_SCRIPTABLE,
clutter_scriptable_iface_init));
struct _ClutterAlphaPrivate
{
ClutterTimeline *timeline;
guint timeline_new_frame_id;
gdouble alpha;
GClosure *closure;
ClutterAlphaFunc func;
gpointer user_data;
GDestroyNotify notify;
gulong mode;
};
enum
{
PROP_0,
PROP_TIMELINE,
PROP_ALPHA,
PROP_MODE,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
static void
timeline_new_frame_cb (ClutterTimeline *timeline,
guint msecs,
ClutterAlpha *alpha)
{
ClutterAlphaPrivate *priv = alpha->priv;
/* Update alpha value and notify */
priv->alpha = clutter_alpha_get_alpha (alpha);
g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_ALPHA]);
}
static void
clutter_alpha_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterAlpha *alpha = CLUTTER_ALPHA (object);
switch (prop_id)
{
case PROP_TIMELINE:
clutter_alpha_set_timeline (alpha, g_value_get_object (value));
break;
case PROP_MODE:
clutter_alpha_set_mode (alpha, g_value_get_ulong (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_alpha_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterAlphaPrivate *priv = CLUTTER_ALPHA (object)->priv;
switch (prop_id)
{
case PROP_TIMELINE:
g_value_set_object (value, priv->timeline);
break;
case PROP_ALPHA:
g_value_set_double (value, priv->alpha);
break;
case PROP_MODE:
g_value_set_ulong (value, priv->mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_alpha_finalize (GObject *object)
{
ClutterAlphaPrivate *priv = CLUTTER_ALPHA (object)->priv;
if (priv->notify != NULL)
priv->notify (priv->user_data);
else if (priv->closure != NULL)
g_closure_unref (priv->closure);
G_OBJECT_CLASS (clutter_alpha_parent_class)->finalize (object);
}
static void
clutter_alpha_dispose (GObject *object)
{
ClutterAlpha *self = CLUTTER_ALPHA(object);
clutter_alpha_set_timeline (self, NULL);
G_OBJECT_CLASS (clutter_alpha_parent_class)->dispose (object);
}
static ClutterAlphaFunc
resolve_alpha_func (const gchar *name)
{
static GModule *module = NULL;
ClutterAlphaFunc func;
CLUTTER_NOTE (SCRIPT, "Looking up '%s' alpha function", name);
if (G_UNLIKELY (module == NULL))
module = g_module_open (NULL, 0);
if (g_module_symbol (module, name, (gpointer) &func))
{
CLUTTER_NOTE (SCRIPT, "Found '%s' alpha function in the symbols table",
name);
return func;
}
return NULL;
}
static void
clutter_alpha_set_custom_property (ClutterScriptable *scriptable,
ClutterScript *script,
const gchar *name,
const GValue *value)
{
if (strncmp (name, "function", 8) == 0)
{
g_assert (G_VALUE_HOLDS (value, G_TYPE_POINTER));
if (g_value_get_pointer (value) != NULL)
{
clutter_alpha_set_func (CLUTTER_ALPHA (scriptable),
g_value_get_pointer (value),
NULL, NULL);
}
}
else
g_object_set_property (G_OBJECT (scriptable), name, value);
}
static gboolean
clutter_alpha_parse_custom_node (ClutterScriptable *scriptable,
ClutterScript *script,
GValue *value,
const gchar *name,
JsonNode *node)
{
if (strncmp (name, "function", 8) == 0)
{
const gchar *func_name = json_node_get_string (node);
g_value_init (value, G_TYPE_POINTER);
g_value_set_pointer (value, resolve_alpha_func (func_name));
return TRUE;
}
/* we need to do this because we use gulong in place
* of ClutterAnimationMode for ClutterAlpha:mode
*/
if (strncmp (name, "mode", 4) == 0)
{
gulong mode;
mode = _clutter_script_resolve_animation_mode (node);
g_value_init (value, G_TYPE_ULONG);
g_value_set_ulong (value, mode);
return TRUE;
}
return FALSE;
}
static void
clutter_scriptable_iface_init (ClutterScriptableIface *iface)
{
iface->parse_custom_node = clutter_alpha_parse_custom_node;
iface->set_custom_property = clutter_alpha_set_custom_property;
}
static void
clutter_alpha_class_init (ClutterAlphaClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->set_property = clutter_alpha_set_property;
object_class->get_property = clutter_alpha_get_property;
object_class->finalize = clutter_alpha_finalize;
object_class->dispose = clutter_alpha_dispose;
g_type_class_add_private (klass, sizeof (ClutterAlphaPrivate));
/**
* ClutterAlpha:timeline:
*
* A #ClutterTimeline instance used to drive the alpha function.
*
* Since: 0.2
*/
obj_props[PROP_TIMELINE] =
g_param_spec_object ("timeline",
P_("Timeline"),
P_("Timeline used by the alpha"),
CLUTTER_TYPE_TIMELINE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterAlpha:alpha:
*
* The alpha value as computed by the alpha function. The linear
* interval is 0.0 to 1.0, but the Alpha allows overshooting by
* one unit in each direction, so the valid interval is -1.0 to 2.0.
*
* Since: 0.2
*/
obj_props[PROP_ALPHA] =
g_param_spec_double ("alpha",
P_("Alpha value"),
P_("Alpha value as computed by the alpha"),
-1.0, 2.0,
0.0,
CLUTTER_PARAM_READABLE);
/**
* ClutterAlpha:mode:
*
* The progress function logical id - either a value from the
* #ClutterAnimationMode enumeration or a value returned by
* clutter_alpha_register_func().
*
* If %CLUTTER_CUSTOM_MODE is used then the function set using
* clutter_alpha_set_closure() or clutter_alpha_set_func()
* will be used.
*
* Since: 1.0
*/
obj_props[PROP_MODE] =
g_param_spec_ulong ("mode",
P_("Mode"),
P_("Progress mode"),
0, G_MAXULONG,
CLUTTER_CUSTOM_MODE,
G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE);
g_object_class_install_properties (object_class,
PROP_LAST,
obj_props);
}
static void
clutter_alpha_init (ClutterAlpha *self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
CLUTTER_TYPE_ALPHA,
ClutterAlphaPrivate);
self->priv->mode = CLUTTER_CUSTOM_MODE;
self->priv->alpha = 0.0;
}
/**
* clutter_alpha_get_alpha:
* @alpha: A #ClutterAlpha
*
* Query the current alpha value.
*
* Return Value: The current alpha value for the alpha
*
* Since: 0.2
*/
gdouble
clutter_alpha_get_alpha (ClutterAlpha *alpha)
{
ClutterAlphaPrivate *priv;
gdouble retval = 0;
g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), 0);
priv = alpha->priv;
if (G_LIKELY (priv->func))
{
return priv->func (alpha, priv->user_data);
}
else if (priv->closure)
{
GValue params = { 0, };
GValue result_value = { 0, };
g_object_ref (alpha);
g_value_init (&result_value, G_TYPE_DOUBLE);
g_value_init (&params, CLUTTER_TYPE_ALPHA);
g_value_set_object (&params, alpha);
g_closure_invoke (priv->closure, &result_value, 1, &params, NULL);
retval = g_value_get_double (&result_value);
g_value_unset (&result_value);
g_value_unset (&params);
g_object_unref (alpha);
}
return retval;
}
/*
* clutter_alpha_set_closure_internal:
* @alpha: a #ClutterAlpha
* @closure: a #GClosure
*
* Sets the @closure for @alpha. This function does not
* set the #ClutterAlpha:mode property and does not emit
* the #GObject::notify signal for it.
*/
static inline void
clutter_alpha_set_closure_internal (ClutterAlpha *alpha,
GClosure *closure)
{
ClutterAlphaPrivate *priv = alpha->priv;
if (priv->notify != NULL)
priv->notify (priv->user_data);
else if (priv->closure != NULL)
g_closure_unref (priv->closure);
priv->func = NULL;
priv->user_data = NULL;
priv->notify = NULL;
if (closure == NULL)
return;
/* need to take ownership of the closure before sinking it */
priv->closure = g_closure_ref (closure);
g_closure_sink (closure);
/* set the marshaller */
if (G_CLOSURE_NEEDS_MARSHAL (closure))
{
GClosureMarshal marshal = _clutter_marshal_DOUBLE__VOID;
g_closure_set_marshal (priv->closure, marshal);
}
}
/**
* clutter_alpha_set_closure:
* @alpha: A #ClutterAlpha
* @closure: A #GClosure
*
* Sets the #GClosure used to compute the alpha value at each
* frame of the #ClutterTimeline bound to @alpha.
*
* Since: 0.8
*/
void
clutter_alpha_set_closure (ClutterAlpha *alpha,
GClosure *closure)
{
ClutterAlphaPrivate *priv;
g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
g_return_if_fail (closure != NULL);
priv = alpha->priv;
clutter_alpha_set_closure_internal (alpha, closure);
priv->mode = CLUTTER_CUSTOM_MODE;
g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_MODE]);
}
/**
* clutter_alpha_set_func:
* @alpha: A #ClutterAlpha
* @func: A #ClutterAlphaFunc
* @data: user data to be passed to the alpha function, or %NULL
* @destroy: notify function used when disposing the alpha function
*
* Sets the #ClutterAlphaFunc function used to compute
* the alpha value at each frame of the #ClutterTimeline
* bound to @alpha.
*
* This function will not register @func as a global alpha function.
*
* Since: 0.2
*/
void
clutter_alpha_set_func (ClutterAlpha *alpha,
ClutterAlphaFunc func,
gpointer data,
GDestroyNotify destroy)
{
ClutterAlphaPrivate *priv;
g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
g_return_if_fail (func != NULL);
priv = alpha->priv;
if (priv->notify != NULL)
{
priv->notify (priv->user_data);
}
else if (priv->closure != NULL)
{
g_closure_unref (priv->closure);
priv->closure = NULL;
}
priv->func = func;
priv->user_data = data;
priv->notify = destroy;
priv->mode = CLUTTER_CUSTOM_MODE;
g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_MODE]);
}
/**
* clutter_alpha_set_timeline:
* @alpha: A #ClutterAlpha
* @timeline: A #ClutterTimeline
*
* Binds @alpha to @timeline.
*
* Since: 0.2
*/
void
clutter_alpha_set_timeline (ClutterAlpha *alpha,
ClutterTimeline *timeline)
{
ClutterAlphaPrivate *priv;
g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
g_return_if_fail (timeline == NULL || CLUTTER_IS_TIMELINE (timeline));
priv = alpha->priv;
if (priv->timeline == timeline)
return;
if (priv->timeline)
{
g_signal_handlers_disconnect_by_func (priv->timeline,
timeline_new_frame_cb,
alpha);
g_object_unref (priv->timeline);
priv->timeline = NULL;
}
if (timeline)
{
priv->timeline = g_object_ref (timeline);
g_signal_connect (priv->timeline, "new-frame",
G_CALLBACK (timeline_new_frame_cb),
alpha);
}
g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_TIMELINE]);
}
/**
* clutter_alpha_get_timeline:
* @alpha: A #ClutterAlpha
*
* Gets the #ClutterTimeline bound to @alpha.
*
* Return value: (transfer none): a #ClutterTimeline instance
*
* Since: 0.2
*/
ClutterTimeline *
clutter_alpha_get_timeline (ClutterAlpha *alpha)
{
g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), NULL);
return alpha->priv->timeline;
}
/**
* clutter_alpha_new:
*
* Creates a new #ClutterAlpha instance. You must set a function
* to compute the alpha value using clutter_alpha_set_func() and
* bind a #ClutterTimeline object to the #ClutterAlpha instance
* using clutter_alpha_set_timeline().
*
* You should use the newly created #ClutterAlpha instance inside
* a #ClutterBehaviour object.
*
* Return value: the newly created empty #ClutterAlpha instance.
*
* Since: 0.2
*/
ClutterAlpha *
clutter_alpha_new (void)
{
return g_object_new (CLUTTER_TYPE_ALPHA, NULL);
}
/**
* clutter_alpha_new_full:
* @timeline: #ClutterTimeline timeline
* @mode: animation mode
*
* Creates a new #ClutterAlpha instance and sets the timeline
* and animation mode.
*
* See also clutter_alpha_set_timeline() and clutter_alpha_set_mode().
*
* Return Value: the newly created #ClutterAlpha
*
* Since: 1.0
*/
ClutterAlpha *
clutter_alpha_new_full (ClutterTimeline *timeline,
gulong mode)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), NULL);
g_return_val_if_fail (mode != CLUTTER_ANIMATION_LAST, NULL);
return g_object_new (CLUTTER_TYPE_ALPHA,
"timeline", timeline,
"mode", mode,
NULL);
}
/**
* clutter_alpha_new_with_func:
* @timeline: a #ClutterTimeline
* @func: a #ClutterAlphaFunc
* @data: data to pass to the function, or %NULL
* @destroy: function to call when removing the alpha function, or %NULL
*
* Creates a new #ClutterAlpha instances and sets the timeline
* and the alpha function.
*
* This function will not register @func as a global alpha function.
*
* See also clutter_alpha_set_timeline() and clutter_alpha_set_func().
*
* Return value: the newly created #ClutterAlpha
*
* Since: 1.0
*/
ClutterAlpha *
clutter_alpha_new_with_func (ClutterTimeline *timeline,
ClutterAlphaFunc func,
gpointer data,
GDestroyNotify destroy)
{
ClutterAlpha *retval;
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), NULL);
g_return_val_if_fail (func != NULL, NULL);
retval = clutter_alpha_new ();
clutter_alpha_set_timeline (retval, timeline);
clutter_alpha_set_func (retval, func, data, destroy);
return retval;
}
/**
* clutter_alpha_get_mode:
* @alpha: a #ClutterAlpha
*
* Retrieves the #ClutterAnimationMode used by @alpha.
*
* Return value: the animation mode
*
* Since: 1.0
*/
gulong
clutter_alpha_get_mode (ClutterAlpha *alpha)
{
g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), CLUTTER_CUSTOM_MODE);
return alpha->priv->mode;
}
typedef struct _AlphaData {
guint closure_set : 1;
ClutterAlphaFunc func;
gpointer data;
GClosure *closure;
} AlphaData;
static GPtrArray *clutter_alphas = NULL;
/*< private >
* _clutter_animation_modes:
*
* A mapping of animation modes and easing functions.
*/
static const struct {
ClutterAnimationMode mode;
ClutterEasingFunc func;
const char *name;
} _clutter_animation_modes[] = {
{ CLUTTER_CUSTOM_MODE, NULL, "custom" },
{ CLUTTER_LINEAR, clutter_linear, "linear" },
{ CLUTTER_EASE_IN_QUAD, clutter_ease_in_quad, "easeInQuad" },
{ CLUTTER_EASE_OUT_QUAD, clutter_ease_out_quad, "easeOutQuad" },
{ CLUTTER_EASE_IN_OUT_QUAD, clutter_ease_in_out_quad, "easeInOutQuad" },
{ CLUTTER_EASE_IN_CUBIC, clutter_ease_in_cubic, "easeInCubic" },
{ CLUTTER_EASE_OUT_CUBIC, clutter_ease_out_cubic, "easeOutCubic" },
{ CLUTTER_EASE_IN_OUT_CUBIC, clutter_ease_in_out_cubic, "easeInOutCubic" },
{ CLUTTER_EASE_IN_QUART, clutter_ease_in_quart, "easeInQuart" },
{ CLUTTER_EASE_OUT_QUART, clutter_ease_out_quart, "easeOutQuart" },
{ CLUTTER_EASE_IN_OUT_QUART, clutter_ease_in_out_quart, "easeInOutQuart" },
{ CLUTTER_EASE_IN_QUINT, clutter_ease_in_quint, "easeInQuint" },
{ CLUTTER_EASE_OUT_QUINT, clutter_ease_out_quint, "easeOutQuint" },
{ CLUTTER_EASE_IN_OUT_QUINT, clutter_ease_in_out_quint, "easeInOutQuint" },
{ CLUTTER_EASE_IN_SINE, clutter_ease_in_sine, "easeInSine" },
{ CLUTTER_EASE_OUT_SINE, clutter_ease_out_sine, "easeOutSine" },
{ CLUTTER_EASE_IN_OUT_SINE, clutter_ease_in_out_sine, "easeInOutSine" },
{ CLUTTER_EASE_IN_EXPO, clutter_ease_in_expo, "easeInExpo" },
{ CLUTTER_EASE_OUT_EXPO, clutter_ease_out_expo, "easeOutExpo" },
{ CLUTTER_EASE_IN_OUT_EXPO, clutter_ease_in_out_expo, "easeInOutExpo" },
{ CLUTTER_EASE_IN_CIRC, clutter_ease_in_circ, "easeInCirc" },
{ CLUTTER_EASE_OUT_CIRC, clutter_ease_out_circ, "easeOutCirc" },
{ CLUTTER_EASE_IN_OUT_CIRC, clutter_ease_in_out_circ, "easeInOutCirc" },
{ CLUTTER_EASE_IN_ELASTIC, clutter_ease_in_elastic, "easeInElastic" },
{ CLUTTER_EASE_OUT_ELASTIC, clutter_ease_out_elastic, "easeOutElastic" },
{ CLUTTER_EASE_IN_OUT_ELASTIC, clutter_ease_in_out_elastic, "easeInOutElastic" },
{ CLUTTER_EASE_IN_BACK, clutter_ease_in_back, "easeInBack" },
{ CLUTTER_EASE_OUT_BACK, clutter_ease_out_back, "easeOutBack" },
{ CLUTTER_EASE_IN_OUT_BACK, clutter_ease_in_out_back, "easeInOutBack" },
{ CLUTTER_EASE_IN_BOUNCE, clutter_ease_in_bounce, "easeInBounce" },
{ CLUTTER_EASE_OUT_BOUNCE, clutter_ease_out_bounce, "easeOutBounce" },
{ CLUTTER_EASE_IN_OUT_BOUNCE, clutter_ease_in_out_bounce, "easeInOutBounce" },
{ CLUTTER_ANIMATION_LAST, NULL, "sentinel" },
};
static gdouble
clutter_alpha_easing_func (ClutterAlpha *alpha,
gpointer data G_GNUC_UNUSED)
{
ClutterAlphaPrivate *priv = alpha->priv;
ClutterTimeline *timeline = priv->timeline;
ClutterEasingFunc easing_func;
gdouble t, d;
if (G_UNLIKELY (priv->timeline == NULL))
return 0.0;
g_assert (_clutter_animation_modes[priv->mode].mode == priv->mode);
g_assert (_clutter_animation_modes[priv->mode].func != NULL);
t = clutter_timeline_get_elapsed_time (timeline);
d = clutter_timeline_get_duration (timeline);
easing_func = _clutter_animation_modes[priv->mode].func;
return easing_func (t, d);
}
/**
* clutter_alpha_set_mode:
* @alpha: a #ClutterAlpha
* @mode: a #ClutterAnimationMode
*
* Sets the progress function of @alpha using the symbolic value
* of @mode, as taken by the #ClutterAnimationMode enumeration or
* using the value returned by clutter_alpha_register_func().
*
* Since: 1.0
*/
void
clutter_alpha_set_mode (ClutterAlpha *alpha,
gulong mode)
{
ClutterAlphaPrivate *priv;
g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
g_return_if_fail (mode != CLUTTER_ANIMATION_LAST);
priv = alpha->priv;
if (mode == CLUTTER_CUSTOM_MODE)
{
priv->mode = mode;
}
else if (mode < CLUTTER_ANIMATION_LAST)
{
if (priv->mode == mode)
return;
/* sanity check to avoid getting an out of sync
* enum/function mapping
*/
g_assert (_clutter_animation_modes[mode].mode == mode);
g_assert (_clutter_animation_modes[mode].func != NULL);
clutter_alpha_set_closure_internal (alpha, NULL);
priv->mode = mode;
CLUTTER_NOTE (ANIMATION, "New easing mode '%s'[%lu]\n",
_clutter_animation_modes[priv->mode].name,
_clutter_animation_modes[priv->mode].mode);
priv->func = clutter_alpha_easing_func;
priv->user_data = NULL;
priv->notify = NULL;
}
else if (mode > CLUTTER_ANIMATION_LAST)
{
AlphaData *alpha_data = NULL;
gulong real_index = 0;
if (priv->mode == mode)
return;
if (G_UNLIKELY (clutter_alphas == NULL))
{
g_warning ("No alpha functions defined for ClutterAlpha to use. "
"Use clutter_alpha_register_func() to register an "
"alpha function.");
return;
}
real_index = mode - CLUTTER_ANIMATION_LAST - 1;
alpha_data = g_ptr_array_index (clutter_alphas, real_index);
if (G_UNLIKELY (alpha_data == NULL))
{
g_warning ("No alpha function registered for mode %lu.",
mode);
return;
}
if (alpha_data->closure_set)
clutter_alpha_set_closure (alpha, alpha_data->closure);
else
{
clutter_alpha_set_closure_internal (alpha, NULL);
priv->func = alpha_data->func;
priv->user_data = alpha_data->data;
priv->notify = NULL;
}
priv->mode = mode;
}
else
g_assert_not_reached ();
g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_MODE]);
}
static gulong
register_alpha_internal (AlphaData *alpha_data)
{
if (G_UNLIKELY (clutter_alphas == NULL))
clutter_alphas = g_ptr_array_new ();
g_ptr_array_add (clutter_alphas, alpha_data);
return clutter_alphas->len + CLUTTER_ANIMATION_LAST;
}
/**
* clutter_alpha_register_func: (skip)
* @func: a #ClutterAlphaFunc
* @data: user data to pass to @func, or %NULL
*
* Registers a global alpha function and returns its logical id
* to be used by clutter_alpha_set_mode() or by #ClutterAnimation.
*
* The logical id is always greater than %CLUTTER_ANIMATION_LAST.
*
* Return value: the logical id of the alpha function
*
* Since: 1.0
*/
gulong
clutter_alpha_register_func (ClutterAlphaFunc func,
gpointer data)
{
AlphaData *alpha_data;
g_return_val_if_fail (func != NULL, 0);
alpha_data = g_slice_new (AlphaData);
alpha_data->closure_set = FALSE;
alpha_data->func = func;
alpha_data->data = data;
return register_alpha_internal (alpha_data);
}
/**
* clutter_alpha_register_closure:
* @closure: a #GClosure
*
* #GClosure variant of clutter_alpha_register_func().
*
* Registers a global alpha function and returns its logical id
* to be used by clutter_alpha_set_mode() or by #ClutterAnimation.
*
* The logical id is always greater than %CLUTTER_ANIMATION_LAST.
*
* Rename to: clutter_alpha_register_func
*
* Return value: the logical id of the alpha function
*
* Since: 1.0
*/
gulong
clutter_alpha_register_closure (GClosure *closure)
{
AlphaData *alpha_data;
g_return_val_if_fail (closure != NULL, 0);
alpha_data = g_slice_new (AlphaData);
alpha_data->closure_set = TRUE;
alpha_data->closure = closure;
return register_alpha_internal (alpha_data);
}
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