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mutter/clutter/clutter-interval.c
Emmanuele Bassi a0c620b157 interval: Transform values on set, if needed 
It's possible that GValues passed to a ClutterInterval setter are not
of the same type as the interval - for instance, if they come from
language bindings, or from untrusted sources; we can use the same
transformation functions we already use inside ClutterTransition to
ensure that the ClutterInterval always stores values of the same type
used to create the interval itself.
2012-06-18 17:25:47 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2008 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:
* Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-interval
* @short_description: An object holding an interval of two values
*
* #ClutterInterval is a simple object that can hold two values
* defining an interval. #ClutterInterval can hold any value that
* can be enclosed inside a #GValue.
*
* Once a #ClutterInterval for a specific #GType has been instantiated
* the #ClutterInterval:value-type property cannot be changed anymore.
*
* #ClutterInterval starts with a floating reference; this means that
* any object taking a reference on a #ClutterInterval instance should
* also take ownership of the interval by using g_object_ref_sink().
*
* #ClutterInterval is used by #ClutterAnimation to define the
* interval of values that an implicit animation should tween over.
*
* #ClutterInterval can be subclassed to override the validation
* and value computation.
*
* #ClutterInterval is available since Clutter 1.0
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <glib-object.h>
#include <gobject/gvaluecollector.h>
#include "clutter-color.h"
#include "clutter-fixed.h"
#include "clutter-interval.h"
#include "clutter-private.h"
#include "clutter-units.h"
enum
{
PROP_0,
PROP_VALUE_TYPE,
PROP_INITIAL,
PROP_FINAL,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
enum
{
INITIAL = 0,
FINAL,
RESULT,
N_VALUES
};
#define CLUTTER_INTERVAL_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_INTERVAL, ClutterIntervalPrivate))
struct _ClutterIntervalPrivate
{
GType value_type;
GValue *values;
};
G_DEFINE_TYPE (ClutterInterval, clutter_interval, G_TYPE_INITIALLY_UNOWNED);
static gboolean
clutter_interval_real_validate (ClutterInterval *interval,
GParamSpec *pspec)
{
GType pspec_gtype = G_PARAM_SPEC_VALUE_TYPE (pspec);
/* check the GTypes we provide first */
if (pspec_gtype == COGL_TYPE_FIXED)
{
ClutterParamSpecFixed *pspec_fixed = CLUTTER_PARAM_SPEC_FIXED (pspec);
CoglFixed a, b;
a = b = 0;
clutter_interval_get_interval (interval, &a, &b);
if ((a >= pspec_fixed->minimum && a <= pspec_fixed->maximum) &&
(b >= pspec_fixed->minimum && b <= pspec_fixed->maximum))
return TRUE;
else
return FALSE;
}
/* then check the fundamental types */
switch (G_TYPE_FUNDAMENTAL (pspec_gtype))
{
case G_TYPE_INT:
{
GParamSpecInt *pspec_int = G_PARAM_SPEC_INT (pspec);
gint a, b;
a = b = 0;
clutter_interval_get_interval (interval, &a, &b);
if ((a >= pspec_int->minimum && a <= pspec_int->maximum) &&
(b >= pspec_int->minimum && b <= pspec_int->maximum))
return TRUE;
else
return FALSE;
}
break;
case G_TYPE_UINT:
{
GParamSpecUInt *pspec_uint = G_PARAM_SPEC_UINT (pspec);
guint a, b;
a = b = 0;
clutter_interval_get_interval (interval, &a, &b);
if ((a >= pspec_uint->minimum && a <= pspec_uint->maximum) &&
(b >= pspec_uint->minimum && b <= pspec_uint->maximum))
return TRUE;
else
return FALSE;
}
break;
case G_TYPE_UCHAR:
{
GParamSpecUChar *pspec_uchar = G_PARAM_SPEC_UCHAR (pspec);
guchar a, b;
a = b = 0;
clutter_interval_get_interval (interval, &a, &b);
if ((a >= pspec_uchar->minimum && a <= pspec_uchar->maximum) &&
(b >= pspec_uchar->minimum && b <= pspec_uchar->maximum))
return TRUE;
else
return FALSE;
}
break;
case G_TYPE_BOOLEAN:
return TRUE;
default:
break;
}
return TRUE;
}
static gboolean
clutter_interval_real_compute_value (ClutterInterval *interval,
gdouble factor,
GValue *value)
{
GValue *initial, *final;
GType value_type;
gboolean retval = FALSE;
initial = clutter_interval_peek_initial_value (interval);
final = clutter_interval_peek_final_value (interval);
value_type = clutter_interval_get_value_type (interval);
if (_clutter_has_progress_function (value_type))
{
retval = _clutter_run_progress_function (value_type,
initial,
final,
factor,
value);
if (retval)
return TRUE;
}
switch (G_TYPE_FUNDAMENTAL (value_type))
{
case G_TYPE_INT:
{
gint ia, ib, res;
ia = g_value_get_int (initial);
ib = g_value_get_int (final);
res = (factor * (ib - ia)) + ia;
g_value_set_int (value, res);
retval = TRUE;
}
break;
case G_TYPE_UINT:
{
guint ia, ib, res;
ia = g_value_get_uint (initial);
ib = g_value_get_uint (final);
res = (factor * (ib - (gdouble) ia)) + ia;
g_value_set_uint (value, res);
retval = TRUE;
}
break;
case G_TYPE_UCHAR:
{
guchar ia, ib, res;
ia = g_value_get_uchar (initial);
ib = g_value_get_uchar (final);
res = (factor * (ib - (gdouble) ia)) + ia;
g_value_set_uchar (value, res);
retval = TRUE;
}
break;
case G_TYPE_FLOAT:
case G_TYPE_DOUBLE:
{
gdouble ia, ib, res;
if (value_type == G_TYPE_DOUBLE)
{
ia = g_value_get_double (initial);
ib = g_value_get_double (final);
}
else
{
ia = g_value_get_float (initial);
ib = g_value_get_float (final);
}
res = (factor * (ib - ia)) + ia;
if (value_type == G_TYPE_DOUBLE)
g_value_set_double (value, res);
else
g_value_set_float (value, res);
retval = TRUE;
}
break;
case G_TYPE_BOOLEAN:
if (factor > 0.5)
g_value_set_boolean (value, TRUE);
else
g_value_set_boolean (value, FALSE);
retval = TRUE;
break;
case G_TYPE_BOXED:
break;
default:
break;
}
/* We're trying to animate a property without knowing how to do that. Issue
* a warning with a hint to what could be done to fix that */
if (G_UNLIKELY (retval == FALSE))
{
g_warning ("%s: Could not compute progress between two %ss. You can "
"register a progress function to instruct ClutterInterval "
"how to deal with this GType",
G_STRLOC,
g_type_name (value_type));
}
return retval;
}
static void
clutter_interval_finalize (GObject *gobject)
{
ClutterIntervalPrivate *priv = CLUTTER_INTERVAL (gobject)->priv;
g_value_unset (&priv->values[0]);
g_value_unset (&priv->values[1]);
g_free (priv->values);
G_OBJECT_CLASS (clutter_interval_parent_class)->finalize (gobject);
}
static void
clutter_interval_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterIntervalPrivate *priv = CLUTTER_INTERVAL_GET_PRIVATE (gobject);
switch (prop_id)
{
case PROP_VALUE_TYPE:
priv->value_type = g_value_get_gtype (value);
break;
case PROP_INITIAL:
if (g_value_get_boxed (value) != NULL)
clutter_interval_set_initial_value (CLUTTER_INTERVAL (gobject),
g_value_get_boxed (value));
else if (G_IS_VALUE (&priv->values[INITIAL]))
g_value_unset (&priv->values[INITIAL]);
break;
case PROP_FINAL:
if (g_value_get_boxed (value) != NULL)
clutter_interval_set_final_value (CLUTTER_INTERVAL (gobject),
g_value_get_boxed (value));
else if (G_IS_VALUE (&priv->values[FINAL]))
g_value_unset (&priv->values[FINAL]);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_interval_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterIntervalPrivate *priv = CLUTTER_INTERVAL_GET_PRIVATE (gobject);
switch (prop_id)
{
case PROP_VALUE_TYPE:
g_value_set_gtype (value, priv->value_type);
break;
case PROP_INITIAL:
if (G_IS_VALUE (&priv->values[INITIAL]))
g_value_set_boxed (value, &priv->values[INITIAL]);
break;
case PROP_FINAL:
if (G_IS_VALUE (&priv->values[FINAL]))
g_value_set_boxed (value, &priv->values[FINAL]);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_interval_class_init (ClutterIntervalClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (ClutterIntervalPrivate));
klass->validate = clutter_interval_real_validate;
klass->compute_value = clutter_interval_real_compute_value;
gobject_class->set_property = clutter_interval_set_property,
gobject_class->get_property = clutter_interval_get_property;
gobject_class->finalize = clutter_interval_finalize;
/**
* ClutterInterval:value-type:
*
* The type of the values in the interval.
*
* Since: 1.0
*/
obj_props[PROP_VALUE_TYPE] =
g_param_spec_gtype ("value-type",
P_("Value Type"),
P_("The type of the values in the interval"),
G_TYPE_NONE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
/**
* ClutterInterval:initial:
*
* The initial value of the interval.
*
* Since: 1.12
*/
obj_props[PROP_INITIAL] =
g_param_spec_boxed ("initial",
P_("Initial Value"),
P_("Initial value of the interval"),
G_TYPE_VALUE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
/**
* ClutterInterval:final:
*
* The final value of the interval.
*
* Since: 1.12
*/
obj_props[PROP_FINAL] =
g_param_spec_boxed ("final",
P_("Final Value"),
P_("Final value of the interval"),
G_TYPE_VALUE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
}
static void
clutter_interval_init (ClutterInterval *self)
{
ClutterIntervalPrivate *priv;
self->priv = priv = CLUTTER_INTERVAL_GET_PRIVATE (self);
priv->value_type = G_TYPE_INVALID;
priv->values = g_malloc0 (sizeof (GValue) * N_VALUES);
}
static inline void
clutter_interval_set_value_internal (ClutterInterval *interval,
gint index_,
const GValue *value)
{
ClutterIntervalPrivate *priv = interval->priv;
GType value_type;
g_assert (index_ >= INITIAL && index_ <= RESULT);
if (G_IS_VALUE (&priv->values[index_]))
g_value_unset (&priv->values[index_]);
g_value_init (&priv->values[index_], priv->value_type);
value_type = G_VALUE_TYPE (value);
if (value_type != priv->value_type ||
!g_type_is_a (value_type, priv->value_type))
{
if (g_value_type_compatible (value_type, priv->value_type))
{
g_value_copy (value, &priv->values[index_]);
return;
}
if (g_value_type_transformable (value_type, priv->value_type))
{
GValue transform = G_VALUE_INIT;
g_value_init (&transform, priv->value_type);
if (g_value_transform (value, &transform))
g_value_copy (&transform, &priv->values[index_]);
else
{
g_warning ("%s: Unable to convert a value of type '%s' into "
"the value type '%s' of the interval.",
G_STRLOC,
g_type_name (value_type),
g_type_name (priv->value_type));
}
g_value_unset (&transform);
}
}
else
g_value_copy (value, &priv->values[index_]);
}
static inline void
clutter_interval_get_value_internal (ClutterInterval *interval,
gint index_,
GValue *value)
{
ClutterIntervalPrivate *priv = interval->priv;
g_assert (index_ >= INITIAL && index_ <= RESULT);
g_value_copy (&priv->values[index_], value);
}
static gboolean
clutter_interval_set_initial_internal (ClutterInterval *interval,
va_list *args)
{
GType gtype = interval->priv->value_type;
GValue value = G_VALUE_INIT;
gchar *error;
/* initial value */
G_VALUE_COLLECT_INIT (&value, gtype, *args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
/* we leak the value here as it might not be in a valid state
* given the error and calling g_value_unset() might lead to
* undefined behaviour
*/
g_free (error);
return FALSE;
}
clutter_interval_set_value_internal (interval, INITIAL, &value);
g_value_unset (&value);
return TRUE;
}
static gboolean
clutter_interval_set_final_internal (ClutterInterval *interval,
va_list *args)
{
GType gtype = interval->priv->value_type;
GValue value = G_VALUE_INIT;
gchar *error;
/* initial value */
G_VALUE_COLLECT_INIT (&value, gtype, *args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
/* we leak the value here as it might not be in a valid state
* given the error and calling g_value_unset() might lead to
* undefined behaviour
*/
g_free (error);
return FALSE;
}
clutter_interval_set_value_internal (interval, FINAL, &value);
g_value_unset (&value);
return TRUE;
}
static void
clutter_interval_get_interval_valist (ClutterInterval *interval,
va_list var_args)
{
GType gtype = interval->priv->value_type;
GValue value = G_VALUE_INIT;
gchar *error;
/* initial value */
g_value_init (&value, gtype);
clutter_interval_get_initial_value (interval, &value);
G_VALUE_LCOPY (&value, var_args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
g_value_unset (&value);
return;
}
g_value_unset (&value);
/* final value */
g_value_init (&value, gtype);
clutter_interval_get_final_value (interval, &value);
G_VALUE_LCOPY (&value, var_args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
g_value_unset (&value);
return;
}
g_value_unset (&value);
}
/**
* clutter_interval_new:
* @gtype: the type of the values in the interval
* @...: the initial value and the final value of the interval
*
* Creates a new #ClutterInterval holding values of type @gtype.
*
* This function avoids using a #GValue for the initial and final values
* of the interval:
*
* |[
* interval = clutter_interval_new (G_TYPE_FLOAT, 0.0, 1.0);
* interval = clutter_interval_new (G_TYPE_BOOLEAN, FALSE, TRUE);
* interval = clutter_interval_new (G_TYPE_INT, 0, 360);
* ]|
*
* Return value: the newly created #ClutterInterval
*
* Since: 1.0
*/
ClutterInterval *
clutter_interval_new (GType gtype,
...)
{
ClutterInterval *retval;
va_list args;
g_return_val_if_fail (gtype != G_TYPE_INVALID, NULL);
retval = g_object_new (CLUTTER_TYPE_INTERVAL, "value-type", gtype, NULL);
va_start (args, gtype);
if (!clutter_interval_set_initial_internal (retval, &args))
goto out;
clutter_interval_set_final_internal (retval, &args);
out:
va_end (args);
return retval;
}
/**
* clutter_interval_new_with_values:
* @gtype: the type of the values in the interval
* @initial: (allow-none): a #GValue holding the initial value of the interval
* @final: (allow-none): a #GValue holding the final value of the interval
*
* Creates a new #ClutterInterval of type @gtype, between @initial
* and @final.
*
* This function is useful for language bindings.
*
* Return value: the newly created #ClutterInterval
*
* Since: 1.0
*/
ClutterInterval *
clutter_interval_new_with_values (GType gtype,
const GValue *initial,
const GValue *final)
{
g_return_val_if_fail (gtype != G_TYPE_INVALID, NULL);
g_return_val_if_fail (initial == NULL || G_VALUE_TYPE (initial) == gtype, NULL);
g_return_val_if_fail (final == NULL || G_VALUE_TYPE (final) == gtype, NULL);
return g_object_new (CLUTTER_TYPE_INTERVAL,
"value-type", gtype,
"initial", initial,
"final", final,
NULL);
}
/**
* clutter_interval_clone:
* @interval: a #ClutterInterval
*
* Creates a copy of @interval.
*
* Return value: (transfer full): the newly created #ClutterInterval
*
* Since: 1.0
*/
ClutterInterval *
clutter_interval_clone (ClutterInterval *interval)
{
ClutterInterval *retval;
GType gtype;
GValue *tmp;
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), NULL);
g_return_val_if_fail (interval->priv->value_type != G_TYPE_INVALID, NULL);
gtype = interval->priv->value_type;
retval = g_object_new (CLUTTER_TYPE_INTERVAL, "value-type", gtype, NULL);
tmp = clutter_interval_peek_initial_value (interval);
clutter_interval_set_initial_value (retval, tmp);
tmp = clutter_interval_peek_final_value (interval);
clutter_interval_set_final_value (retval, tmp);
return retval;
}
/**
* clutter_interval_get_value_type:
* @interval: a #ClutterInterval
*
* Retrieves the #GType of the values inside @interval.
*
* Return value: the type of the value, or G_TYPE_INVALID
*
* Since: 1.0
*/
GType
clutter_interval_get_value_type (ClutterInterval *interval)
{
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), G_TYPE_INVALID);
return interval->priv->value_type;
}
/**
* clutter_interval_set_initial_value:
* @interval: a #ClutterInterval
* @value: a #GValue
*
* Sets the initial value of @interval to @value. The value is copied
* inside the #ClutterInterval.
*
* Rename to: clutter_interval_set_initial
*
* Since: 1.0
*/
void
clutter_interval_set_initial_value (ClutterInterval *interval,
const GValue *value)
{
ClutterIntervalPrivate *priv;
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
g_return_if_fail (value != NULL);
priv = interval->priv;
g_return_if_fail (G_VALUE_TYPE (value) == priv->value_type);
clutter_interval_set_value_internal (interval, INITIAL, value);
}
/**
* clutter_interval_set_initial: (skip)
* @interval: a #ClutterInterval
* @...: the initial value of the interval.
*
* Variadic arguments version of clutter_interval_set_initial_value().
*
* This function is meant as a convenience for the C API.
*
* Language bindings should use clutter_interval_set_initial_value()
* instead.
*
* Since: 1.10
*/
void
clutter_interval_set_initial (ClutterInterval *interval,
...)
{
va_list args;
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
va_start (args, interval);
clutter_interval_set_initial_internal (interval, &args);
va_end (args);
}
/**
* clutter_interval_get_initial_value:
* @interval: a #ClutterInterval
* @value: (out caller-allocates): a #GValue
*
* Retrieves the initial value of @interval and copies
* it into @value.
*
* The passed #GValue must be initialized to the value held by
* the #ClutterInterval.
*
* Since: 1.0
*/
void
clutter_interval_get_initial_value (ClutterInterval *interval,
GValue *value)
{
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
g_return_if_fail (value != NULL);
clutter_interval_get_value_internal (interval, INITIAL, value);
}
/**
* clutter_interval_peek_initial_value:
* @interval: a #ClutterInterval
*
* Gets the pointer to the initial value of @interval
*
* Return value: (transfer none): the initial value of the interval.
* The value is owned by the #ClutterInterval and it should not be
* modified or freed
*
* Since: 1.0
*/
GValue *
clutter_interval_peek_initial_value (ClutterInterval *interval)
{
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), NULL);
return interval->priv->values + INITIAL;
}
/**
* clutter_interval_set_final_value:
* @interval: a #ClutterInterval
* @value: a #GValue
*
* Sets the final value of @interval to @value. The value is
* copied inside the #ClutterInterval.
*
* Rename to: clutter_interval_set_final
*
* Since: 1.0
*/
void
clutter_interval_set_final_value (ClutterInterval *interval,
const GValue *value)
{
ClutterIntervalPrivate *priv;
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
g_return_if_fail (value != NULL);
priv = interval->priv;
g_return_if_fail (G_VALUE_TYPE (value) == priv->value_type);
clutter_interval_set_value_internal (interval, FINAL, value);
}
/**
* clutter_interval_get_final_value:
* @interval: a #ClutterInterval
* @value: (out caller-allocates): a #GValue
*
* Retrieves the final value of @interval and copies
* it into @value.
*
* The passed #GValue must be initialized to the value held by
* the #ClutterInterval.
*
* Since: 1.0
*/
void
clutter_interval_get_final_value (ClutterInterval *interval,
GValue *value)
{
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
g_return_if_fail (value != NULL);
clutter_interval_get_value_internal (interval, FINAL, value);
}
/**
* clutter_interval_set_final: (skip)
* @interval: a #ClutterInterval
* @...: the final value of the interval
*
* Variadic arguments version of clutter_interval_set_final_value().
*
* This function is meant as a convenience for the C API.
*
* Language bindings should use clutter_interval_set_final_value() instead.
*
* Since: 1.10
*/
void
clutter_interval_set_final (ClutterInterval *interval,
...)
{
va_list args;
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
va_start (args, interval);
clutter_interval_set_final_internal (interval, &args);
va_end (args);
}
/**
* clutter_interval_peek_final_value:
* @interval: a #ClutterInterval
*
* Gets the pointer to the final value of @interval
*
* Return value: (transfer none): the final value of the interval.
* The value is owned by the #ClutterInterval and it should not be
* modified or freed
*
* Since: 1.0
*/
GValue *
clutter_interval_peek_final_value (ClutterInterval *interval)
{
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), NULL);
return interval->priv->values + FINAL;
}
/**
* clutter_interval_set_interval:
* @interval: a #ClutterInterval
* @...: the initial and final values of the interval
*
* Variable arguments wrapper for clutter_interval_set_initial_value()
* and clutter_interval_set_final_value() that avoids using the
* #GValue arguments:
*
* |[
* clutter_interval_set_interval (interval, 0, 50);
* clutter_interval_set_interval (interval, 1.0, 0.0);
* clutter_interval_set_interval (interval, FALSE, TRUE);
* ]|
*
* This function is meant for the convenience of the C API; bindings
* should reimplement this function using the #GValue-based API.
*
* Since: 1.0
*/
void
clutter_interval_set_interval (ClutterInterval *interval,
...)
{
va_list args;
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
g_return_if_fail (interval->priv->value_type != G_TYPE_INVALID);
va_start (args, interval);
if (!clutter_interval_set_initial_internal (interval, &args))
goto out;
clutter_interval_set_final_internal (interval, &args);
out:
va_end (args);
}
/**
* clutter_interval_get_interval:
* @interval: a #ClutterInterval
* @...: return locations for the initial and final values of
* the interval
*
* Variable arguments wrapper for clutter_interval_get_initial_value()
* and clutter_interval_get_final_value() that avoids using the
* #GValue arguments:
*
* |[
* gint a = 0, b = 0;
* clutter_interval_get_interval (interval, &a, &b);
* ]|
*
* This function is meant for the convenience of the C API; bindings
* should reimplement this function using the #GValue-based API.
*
* Since: 1.0
*/
void
clutter_interval_get_interval (ClutterInterval *interval,
...)
{
va_list args;
g_return_if_fail (CLUTTER_IS_INTERVAL (interval));
g_return_if_fail (interval->priv->value_type != G_TYPE_INVALID);
va_start (args, interval);
clutter_interval_get_interval_valist (interval, args);
va_end (args);
}
/**
* clutter_interval_validate:
* @interval: a #ClutterInterval
* @pspec: a #GParamSpec
*
* Validates the initial and final values of @interval against
* a #GParamSpec.
*
* Return value: %TRUE if the #ClutterInterval is valid, %FALSE otherwise
*
* Since: 1.0
*/
gboolean
clutter_interval_validate (ClutterInterval *interval,
GParamSpec *pspec)
{
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), FALSE);
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
return CLUTTER_INTERVAL_GET_CLASS (interval)->validate (interval, pspec);
}
/**
* clutter_interval_compute_value:
* @interval: a #ClutterInterval
* @factor: the progress factor, between 0 and 1
* @value: (out caller-allocates): return location for an initialized #GValue
*
* Computes the value between the @interval boundaries given the
* progress @factor and copies it into @value.
*
* Return value: %TRUE if the operation was successful
*
* Since: 1.0
*/
gboolean
clutter_interval_compute_value (ClutterInterval *interval,
gdouble factor,
GValue *value)
{
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), FALSE);
g_return_val_if_fail (value != NULL, FALSE);
return CLUTTER_INTERVAL_GET_CLASS (interval)->compute_value (interval,
factor,
value);
}
/**
* clutter_interval_compute:
* @interval: a #ClutterInterval
* @factor: the progress factor, between 0 and 1
*
* Computes the value between the @interval boundaries given the
* progress @factor
*
* Unlike clutter_interval_compute_value(), this function will
* return a const pointer to the computed value
*
* You should use this function if you immediately pass the computed
* value to another function that makes a copy of it, like
* g_object_set_property()
*
* Return value: (transfer none): a pointer to the computed value,
* or %NULL if the computation was not successfull
*
* Since: 1.4
*/
const GValue *
clutter_interval_compute (ClutterInterval *interval,
gdouble factor)
{
GValue *value;
gboolean res;
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), NULL);
value = &(interval->priv->values[RESULT]);
if (G_VALUE_TYPE (value) == G_TYPE_INVALID)
g_value_init (value, interval->priv->value_type);
res = CLUTTER_INTERVAL_GET_CLASS (interval)->compute_value (interval,
factor,
value);
if (res)
return interval->priv->values + RESULT;
return NULL;
}
/**
* clutter_interval_is_valid:
* @interval: a #ClutterInterval
*
* Checks if the @interval has a valid initial and final values.
*
* Return value: %TRUE if the #ClutterInterval has an initial and
* final values, and %FALSE otherwise
*
* Since: 1.12
*/
gboolean
clutter_interval_is_valid (ClutterInterval *interval)
{
ClutterIntervalPrivate *priv;
g_return_val_if_fail (CLUTTER_IS_INTERVAL (interval), FALSE);
priv = interval->priv;
return G_IS_VALUE (&priv->values[INITIAL]) &&
G_IS_VALUE (&priv->values[FINAL]);
}
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