79acb088e7
Since using addresses that might change is something that finally the FSF acknowledge as a plausible scenario (after changing address twice), the license blurb in the source files should use the URI for getting the license in case the library did not come with it. Not that URIs cannot possibly change, but at least it's easier to set up a redirection at the same place. As a side note: this commit closes the oldes bug in Clutter's bug report tool. http://bugzilla.openedhand.com/show_bug.cgi?id=521
305 lines
8.6 KiB
C
305 lines
8.6 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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*
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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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/**
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* SECTION:clutter-behaviour-opacity
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* @short_description: A behaviour controlling opacity
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*
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* #ClutterBehaviourPath interpolates actors opacity between two values.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-actor.h"
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#include "clutter-behaviour.h"
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#include "clutter-behaviour-opacity.h"
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#include "clutter-enum-types.h"
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#include "clutter-main.h"
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#include "clutter-private.h"
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#include "clutter-debug.h"
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#include <math.h>
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/**
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* SECTION:clutter-behaviour-opacity
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* @short_description: Behaviour controlling the opacity
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*
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* #ClutterBehaviourOpacity controls the opacity of a set of actors.
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*
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* Since: 0.2
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*/
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G_DEFINE_TYPE (ClutterBehaviourOpacity,
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clutter_behaviour_opacity,
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CLUTTER_TYPE_BEHAVIOUR);
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struct _ClutterBehaviourOpacityPrivate
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{
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guint8 opacity_start;
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guint8 opacity_end;
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};
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#define CLUTTER_BEHAVIOUR_OPACITY_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
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CLUTTER_TYPE_BEHAVIOUR_OPACITY, \
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ClutterBehaviourOpacityPrivate))
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enum
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{
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PROP_0,
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PROP_OPACITY_START,
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PROP_OPACITY_END
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};
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static void
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alpha_notify_foreach (ClutterBehaviour *behaviour,
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ClutterActor *actor,
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gpointer data)
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{
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clutter_actor_set_opacity (actor, GPOINTER_TO_UINT(data));
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}
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static void
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clutter_behaviour_alpha_notify (ClutterBehaviour *behave,
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gdouble alpha_value)
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{
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ClutterBehaviourOpacityPrivate *priv;
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guint8 opacity;
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priv = CLUTTER_BEHAVIOUR_OPACITY (behave)->priv;
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opacity = alpha_value
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* (priv->opacity_end - priv->opacity_start)
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+ priv->opacity_start;
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CLUTTER_NOTE (BEHAVIOUR, "alpha: %.4f, opacity: %u",
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alpha_value,
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opacity);
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clutter_behaviour_actors_foreach (behave,
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alpha_notify_foreach,
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GUINT_TO_POINTER ((guint) opacity));
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}
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static void
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clutter_behaviour_opacity_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ClutterBehaviourOpacity *self = CLUTTER_BEHAVIOUR_OPACITY (gobject);
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switch (prop_id)
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{
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case PROP_OPACITY_START:
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clutter_behaviour_opacity_set_bounds (self,
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g_value_get_uint (value),
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self->priv->opacity_end);
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break;
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case PROP_OPACITY_END:
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clutter_behaviour_opacity_set_bounds (self,
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self->priv->opacity_start,
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g_value_get_uint (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_behaviour_opacity_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ClutterBehaviourOpacity *self = CLUTTER_BEHAVIOUR_OPACITY (gobject);
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switch (prop_id)
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{
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case PROP_OPACITY_START:
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g_value_set_uint (value, self->priv->opacity_start);
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break;
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case PROP_OPACITY_END:
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g_value_set_uint (value, self->priv->opacity_end);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_behaviour_opacity_class_init (ClutterBehaviourOpacityClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterBehaviourClass *behave_class = CLUTTER_BEHAVIOUR_CLASS (klass);
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GParamSpec *pspec;
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g_type_class_add_private (klass, sizeof (ClutterBehaviourOpacityPrivate));
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gobject_class->set_property = clutter_behaviour_opacity_set_property;
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gobject_class->get_property = clutter_behaviour_opacity_get_property;
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/**
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* ClutterBehaviourOpacity:opacity-start:
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*
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* Initial opacity level of the behaviour.
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*
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* Since: 0.2
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*/
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pspec = g_param_spec_uint ("opacity-start",
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"Opacity Start",
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"Initial opacity level",
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0, 255,
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0,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (gobject_class, PROP_OPACITY_START, pspec);
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/**
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* ClutterBehaviourOpacity:opacity-end:
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*
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* Final opacity level of the behaviour.
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*
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* Since: 0.2
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*/
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pspec = g_param_spec_uint ("opacity-end",
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"Opacity End",
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"Final opacity level",
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0, 255,
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0,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (gobject_class, PROP_OPACITY_END, pspec);
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behave_class->alpha_notify = clutter_behaviour_alpha_notify;
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}
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static void
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clutter_behaviour_opacity_init (ClutterBehaviourOpacity *self)
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{
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self->priv = CLUTTER_BEHAVIOUR_OPACITY_GET_PRIVATE (self);
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self->priv->opacity_start = 0;
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self->priv->opacity_end = 0;
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}
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/**
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* clutter_behaviour_opacity_new:
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* @alpha: a #ClutterAlpha instance, or %NULL
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* @opacity_start: minimum level of opacity
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* @opacity_end: maximum level of opacity
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*
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* Creates a new #ClutterBehaviourOpacity object, driven by @alpha
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* which controls the opacity property of every actor, making it
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* change in the interval between @opacity_start and @opacity_end.
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*
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* Return value: the newly created #ClutterBehaviourOpacity
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*
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* Since: 0.2
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*/
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ClutterBehaviour *
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clutter_behaviour_opacity_new (ClutterAlpha *alpha,
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guint8 opacity_start,
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guint8 opacity_end)
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{
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return g_object_new (CLUTTER_TYPE_BEHAVIOUR_OPACITY,
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"alpha", alpha,
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"opacity-start", opacity_start,
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"opacity-end", opacity_end,
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NULL);
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}
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/**
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* clutter_behaviour_opacity_set_bounds:
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* @behaviour: a #ClutterBehaviourOpacity
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* @opacity_start: minimum level of opacity
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* @opacity_end: maximum level of opacity
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*
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* Sets the initial and final levels of the opacity applied by @behaviour
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* on each actor it controls.
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*
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* Since: 0.6
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*/
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void
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clutter_behaviour_opacity_set_bounds (ClutterBehaviourOpacity *behaviour,
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guint8 opacity_start,
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guint8 opacity_end)
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{
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ClutterBehaviourOpacityPrivate *priv;
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g_return_if_fail (CLUTTER_IS_BEHAVIOUR_OPACITY (behaviour));
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priv = behaviour->priv;
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g_object_freeze_notify (G_OBJECT (behaviour));
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if (priv->opacity_start != opacity_start)
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{
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priv->opacity_start = opacity_start;
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g_object_notify (G_OBJECT (behaviour), "opacity-start");
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}
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if (priv->opacity_end != opacity_end)
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{
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priv->opacity_end = opacity_end;
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g_object_notify (G_OBJECT (behaviour), "opacity-end");
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}
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g_object_thaw_notify (G_OBJECT (behaviour));
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}
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/**
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* clutter_behaviour_opacity_get_bounds:
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* @behaviour: a #ClutterBehaviourOpacity
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* @opacity_start: return location for the minimum level of opacity, or %NULL
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* @opacity_end: return location for the maximum level of opacity, or %NULL
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*
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* Gets the initial and final levels of the opacity applied by @behaviour
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* on each actor it controls.
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*
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* Since: 0.6
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*/
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void
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clutter_behaviour_opacity_get_bounds (ClutterBehaviourOpacity *behaviour,
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guint8 *opacity_start,
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guint8 *opacity_end)
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{
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g_return_if_fail (CLUTTER_IS_BEHAVIOUR_OPACITY (behaviour));
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if (opacity_start)
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*opacity_start = behaviour->priv->opacity_start;
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if (opacity_end)
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*opacity_end = behaviour->priv->opacity_end;
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}
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