7d7372af43
The current Alpha value is an unsigned integer that can be used implicitly as a fixed point value. This makes writing an alpha function overshooting below and above the current range basically impossible without complicating an already complex code, and creating weird corner cases. For this reason, the Alpha value should be defined as a floating point normalized value, spanning a range between 0.0 and 1.0; in order to allow overshooting, the valid range is extended one unit below and one unit above, thus making it -1.0 .. 2.0. This commit updates the various users of the ClutterAlpha API and the tests cases. This commit also removes all the current alpha functions exposed in the public API.
156 lines
5.4 KiB
C
156 lines
5.4 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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* Authored By Matthew Allum <mallum@openedhand.com>
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* Jorn Baayen <jorn@openedhand.com>
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* Emmanuele Bassi <ebassi@openedhand.com>
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*
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* Copyright (C) 2006 OpenedHand
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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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#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_BEHAVIOUR_H__
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#define __CLUTTER_BEHAVIOUR_H__
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#include <glib-object.h>
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#include <clutter/clutter-alpha.h>
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#include <clutter/clutter-types.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_BEHAVIOUR clutter_behaviour_get_type()
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#define CLUTTER_BEHAVIOUR(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), \
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CLUTTER_TYPE_BEHAVIOUR, ClutterBehaviour))
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#define CLUTTER_BEHAVIOUR_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST ((klass), \
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CLUTTER_TYPE_BEHAVIOUR, ClutterBehaviourClass))
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#define CLUTTER_IS_BEHAVIOUR(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
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CLUTTER_TYPE_BEHAVIOUR))
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#define CLUTTER_IS_BEHAVIOUR_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE ((klass), \
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CLUTTER_TYPE_BEHAVIOUR))
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#define CLUTTER_BEHAVIOUR_GET_CLASS(obj) \
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(G_TYPE_INSTANCE_GET_CLASS ((obj), \
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CLUTTER_TYPE_BEHAVIOUR, ClutterBehaviourClass))
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typedef struct _ClutterBehaviour ClutterBehaviour;
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typedef struct _ClutterBehaviourPrivate ClutterBehaviourPrivate;
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typedef struct _ClutterBehaviourClass ClutterBehaviourClass;
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/**
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* ClutterBehaviourForeachFunc:
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* @behaviour: the #ClutterBehaviour
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* @actor: an actor driven by @behaviour
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* @data: optional data passed to the function
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*
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* This function is passed to clutter_behaviour_foreach_actor() and
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* will be called for each actor driven by @behaviour.
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*
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* Since: 0.2
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*/
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typedef void (*ClutterBehaviourForeachFunc) (ClutterBehaviour *behaviour,
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ClutterActor *actor,
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gpointer data);
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/**
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* ClutterBehaviour:
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*
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* #ClutterBehaviour-struct contains only private data and should
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* be accessed with the functions below.
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*
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* Since: 0.2
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*/
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struct _ClutterBehaviour
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{
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/*< private >*/
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GObject parent;
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ClutterBehaviourPrivate *priv;
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};
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/**
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* ClutterBehaviourClass
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* @alpha_notify: virtual function, called each time the #ClutterAlpha
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* computes a new alpha value; the actors to which the behaviour applies
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* should be changed in this function. Every subclass of #ClutterBehaviour
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* must implement this virtual function
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* @applied: signal class handler for the ClutterBehaviour::applied signal
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* @removed: signal class handler for the ClutterBehaviour::removed signal
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*
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* Base class for behaviours.
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*
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* Since: 0.2
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*/
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struct _ClutterBehaviourClass
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{
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/*< private >*/
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GObjectClass parent_class;
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/*< public >*/
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/* vfunc, not signal */
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void (*alpha_notify) (ClutterBehaviour *behave,
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gdouble alpha_value);
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/* signals */
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void (*applied) (ClutterBehaviour *behave,
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ClutterActor *actor);
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void (*removed) (ClutterBehaviour *behave,
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ClutterActor *actor);
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/*< private >*/
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/* padding, for future expansion */
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void (*_clutter_behaviour1) (void);
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void (*_clutter_behaviour2) (void);
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void (*_clutter_behaviour3) (void);
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void (*_clutter_behaviour4) (void);
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void (*_clutter_behaviour5) (void);
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void (*_clutter_behaviour6) (void);
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};
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GType clutter_behaviour_get_type (void) G_GNUC_CONST;
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void clutter_behaviour_apply (ClutterBehaviour *behave,
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ClutterActor *actor);
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void clutter_behaviour_remove (ClutterBehaviour *behave,
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ClutterActor *actor);
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void clutter_behaviour_remove_all (ClutterBehaviour *behave);
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void clutter_behaviour_actors_foreach (ClutterBehaviour *behave,
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ClutterBehaviourForeachFunc func,
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gpointer data);
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gint clutter_behaviour_get_n_actors (ClutterBehaviour *behave);
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ClutterActor *clutter_behaviour_get_nth_actor (ClutterBehaviour *behave,
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gint index_);
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GSList * clutter_behaviour_get_actors (ClutterBehaviour *behave);
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ClutterAlpha *clutter_behaviour_get_alpha (ClutterBehaviour *behave);
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void clutter_behaviour_set_alpha (ClutterBehaviour *behave,
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ClutterAlpha *alpha);
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gboolean clutter_behaviour_is_applied (ClutterBehaviour *behave,
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ClutterActor *actor);
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G_END_DECLS
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#endif
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