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2b81d90dd7
The G_CONST_RETURN define in GLib is, and has always been, a bit fuzzy. We always used it to conform to the platform, at least for public-facing API. At first I assumed it has something to do with brain-damaged compilers or with weird platforms where const was not really supported; sadly, it's something much, much worse: it's a define that can be toggled at compile-time to remove const from the signature of public API. This is a truly terrifying feature that I assume was added in the past century, and whose inception clearly had something to do with massive doses of absynthe and opium — because any other explanation would make the existence of such a feature even worse than assuming drugs had anything to do with it. Anyway, and pleasing the gods, this dubious feature is being removed/deprecated in GLib; see bug: https://bugzilla.gnome.org/show_bug.cgi?id=644611 Before deprecation, though, we should just remove its usage from the whole API. We should especially remove its usage from Cally's internals, since there it never made sense in the first place.
166 lines
6.5 KiB
C
166 lines
6.5 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2008 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author:
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* Emmanuele Bassi <ebassi@linux.intel.com>
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*/
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#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <clutter/clutter.h> can be included directly."
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#endif
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#ifndef __CLUTTER_INTERVAL_H__
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#define __CLUTTER_INTERVAL_H__
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#include <glib-object.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_INTERVAL (clutter_interval_get_type ())
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#define CLUTTER_INTERVAL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_INTERVAL, ClutterInterval))
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#define CLUTTER_IS_INTERVAL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_INTERVAL))
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#define CLUTTER_INTERVAL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_INTERVAL, ClutterIntervalClass))
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#define CLUTTER_IS_INTERVAL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_INTERVAL))
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#define CLUTTER_INTERVAL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_INTERVAL, ClutterIntervalClass))
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typedef struct _ClutterInterval ClutterInterval;
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typedef struct _ClutterIntervalPrivate ClutterIntervalPrivate;
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typedef struct _ClutterIntervalClass ClutterIntervalClass;
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/**
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* ClutterProgressFunc:
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* @a: the initial value of an interval
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* @b: the final value of an interval
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* @progress: the progress factor, between 0 and 1
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* @retval: the value used to store the progress
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*
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* Prototype of the progress function used to compute the value
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* between the two ends @a and @b of an interval depending on
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* the value of @progress.
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*
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* The #GValue in @retval is already initialized with the same
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* type as @a and @b.
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*
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* This function will be called by #ClutterInterval if the
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* type of the values of the interval was registered using
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* clutter_interval_register_progress_func().
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*
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* Return value: %TRUE if the function successfully computed
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* the value and stored it inside @retval
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*
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* Since: 1.0
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*/
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typedef gboolean (* ClutterProgressFunc) (const GValue *a,
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const GValue *b,
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gdouble progress,
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GValue *retval);
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/**
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* ClutterInterval:
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*
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* The #ClutterInterval structure contains only private data and should
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* be accessed using the provided functions.
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*
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* Since: 1.0
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*/
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struct _ClutterInterval
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{
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/*< private >*/
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GInitiallyUnowned parent_instance;
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ClutterIntervalPrivate *priv;
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};
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/**
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* ClutterIntervalClass:
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* @validate: virtual function for validating an interval
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* using a #GParamSpec
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* @compute_value: virtual function for computing the value
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* inside an interval using an adimensional factor between 0 and 1
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*
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* The #ClutterIntervalClass contains only private data.
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*
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* Since: 1.0
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*/
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struct _ClutterIntervalClass
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{
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/*< private >*/
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GInitiallyUnownedClass parent_class;
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/*< public >*/
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gboolean (* validate) (ClutterInterval *interval,
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GParamSpec *pspec);
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gboolean (* compute_value) (ClutterInterval *interval,
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gdouble factor,
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GValue *value);
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/*< private >*/
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/* padding for future expansion */
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void (*_clutter_reserved1) (void);
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void (*_clutter_reserved2) (void);
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void (*_clutter_reserved3) (void);
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void (*_clutter_reserved4) (void);
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void (*_clutter_reserved5) (void);
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void (*_clutter_reserved6) (void);
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};
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GType clutter_interval_get_type (void) G_GNUC_CONST;
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ClutterInterval *clutter_interval_new (GType gtype,
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...);
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ClutterInterval *clutter_interval_new_with_values (GType gtype,
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const GValue *initial,
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const GValue *final);
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ClutterInterval *clutter_interval_clone (ClutterInterval *interval);
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GType clutter_interval_get_value_type (ClutterInterval *interval);
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void clutter_interval_set_initial_value (ClutterInterval *interval,
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const GValue *value);
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void clutter_interval_get_initial_value (ClutterInterval *interval,
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GValue *value);
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GValue * clutter_interval_peek_initial_value (ClutterInterval *interval);
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void clutter_interval_set_final_value (ClutterInterval *interval,
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const GValue *value);
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void clutter_interval_get_final_value (ClutterInterval *interval,
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GValue *value);
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GValue * clutter_interval_peek_final_value (ClutterInterval *interval);
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void clutter_interval_set_interval (ClutterInterval *interval,
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...);
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void clutter_interval_get_interval (ClutterInterval *interval,
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...);
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gboolean clutter_interval_validate (ClutterInterval *interval,
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GParamSpec *pspec);
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gboolean clutter_interval_compute_value (ClutterInterval *interval,
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gdouble factor,
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GValue *value);
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const GValue * clutter_interval_compute (ClutterInterval *interval,
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gdouble factor);
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void clutter_interval_register_progress_func (GType value_type,
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ClutterProgressFunc func);
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G_END_DECLS
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#endif /* __CLUTTER_INTERVAL_H__ */
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