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https://github.com/brl/mutter.git
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2006-08-28 Jorn Baayen <jorn@openedhand.com>
* clutter/Makefile.am: * clutter/clutter-alpha.c: * clutter/clutter-alpha.h: * clutter/clutter-behaviours.c: (clutter_behaviour_opacity_dispose), (clutter_behaviour_opacity_init), (clutter_behaviour_opacity_frame_foreach), (clutter_behaviour_opacity_frame): * clutter/clutter-behaviours.h: * clutter/clutter-timeline.c: (clutter_timeline_class_init): * clutter/clutter-timeline.h: * clutter/clutter.h: * examples/behave.c: (main): Separate alpha calculation into its own class. * clutter/clutter-behaviour.c: (clutter_behaviour_set_timelime): Correct NULL check.
This commit is contained in:
Jorn Baayen
339
clutter/clutter-alpha.c
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339
clutter/clutter-alpha.c
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/*
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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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*
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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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:clutter-alpha
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* @short_description: A class for calculating an alpha value as a function
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* of time.
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*
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* #ClutterAlpha is a class for calculating an alpha value as a function
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* of time.
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*/
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#include "clutter-alpha.h"
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#include "clutter-main.h"
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#include "clutter-marshal.h"
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G_DEFINE_TYPE (ClutterAlpha, clutter_alpha, G_TYPE_OBJECT);
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struct ClutterAlphaPrivate
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{
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ClutterTimeline *timeline;
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guint timeline_new_frame_id;
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guint32 alpha;
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ClutterAlphaFunc func;
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};
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enum
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{
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PROP_0,
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PROP_TIMELINE,
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PROP_FUNC,
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PROP_ALPHA
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};
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/* Alpha funcs */
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guint32
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clutter_alpha_ramp_inc_func (ClutterAlpha *alpha)
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{
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int current_frame_num, nframes;
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current_frame_num =
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clutter_timeline_get_current_frame (alpha->priv->timeline);
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nframes =
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clutter_timeline_get_n_frames (alpha->priv->timeline);
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return (current_frame_num * CLUTTER_ALPHA_MAX_ALPHA) / nframes;
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}
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guint32
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clutter_alpha_ramp_dec_func (ClutterAlpha *alpha)
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{
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int current_frame_num, nframes;
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current_frame_num =
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clutter_timeline_get_current_frame (alpha->priv->timeline);
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nframes =
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clutter_timeline_get_n_frames (alpha->priv->timeline);
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return ((nframes - current_frame_num) * CLUTTER_ALPHA_MAX_ALPHA) / nframes;
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}
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guint32
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clutter_alpha_ramp_func (ClutterAlpha *alpha)
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{
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int current_frame_num, nframes;
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current_frame_num =
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clutter_timeline_get_current_frame (alpha->priv->timeline);
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nframes =
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clutter_timeline_get_n_frames (alpha->priv->timeline);
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if (current_frame_num > (nframes/2))
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{
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return ((nframes - current_frame_num)
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* CLUTTER_ALPHA_MAX_ALPHA) / (nframes/2);
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}
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else
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{
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return (current_frame_num * CLUTTER_ALPHA_MAX_ALPHA) / (nframes/2);
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}
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}
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/* Object */
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static void
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timeline_new_frame_cb (ClutterTimeline *timeline,
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guint current_frame_num,
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ClutterAlpha *alpha)
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{
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ClutterAlphaPrivate *priv;
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priv = alpha->priv;
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/* Update alpha value */
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if (priv->func) {
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priv->alpha = priv->func(alpha);
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g_object_notify (G_OBJECT (alpha), "alpha");
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}
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}
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static void
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clutter_alpha_set_property (GObject *object,
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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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ClutterAlpha *alpha;
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ClutterAlphaPrivate *priv;
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alpha = CLUTTER_ALPHA(object);
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priv = alpha->priv;
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switch (prop_id)
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{
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case PROP_TIMELINE:
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clutter_alpha_set_timeline (alpha, g_value_get_object (value));
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break;
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case PROP_FUNC:
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priv->func = g_value_get_pointer (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, 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_alpha_get_property (GObject *object,
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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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ClutterAlpha *alpha;
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ClutterAlphaPrivate *priv;
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alpha = CLUTTER_ALPHA(object);
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priv = alpha->priv;
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switch (prop_id)
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{
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case PROP_TIMELINE:
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g_value_set_object (value, priv->timeline);
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break;
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case PROP_FUNC:
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g_value_set_pointer (value, priv->func);
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break;
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case PROP_ALPHA:
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g_value_set_int (value, priv->alpha);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, 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_alpha_finalize (GObject *object)
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{
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G_OBJECT_CLASS (clutter_alpha_parent_class)->finalize (object);
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}
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static void
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clutter_alpha_dispose (GObject *object)
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{
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ClutterAlpha *self = CLUTTER_ALPHA(object);
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clutter_alpha_set_timeline (self, NULL);
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G_OBJECT_CLASS (clutter_alpha_parent_class)->dispose (object);
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}
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static void
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clutter_alpha_class_init (ClutterAlphaClass *klass)
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{
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GObjectClass *object_class;
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object_class = (GObjectClass*) klass;
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object_class->set_property = clutter_alpha_set_property;
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object_class->get_property = clutter_alpha_get_property;
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object_class->finalize = clutter_alpha_finalize;
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object_class->dispose = clutter_alpha_dispose;
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g_type_class_add_private (klass, sizeof (ClutterAlphaPrivate));
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g_object_class_install_property
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(object_class, PROP_TIMELINE,
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g_param_spec_object ("timeline",
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"Timeline",
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"Timeline",
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CLUTTER_TYPE_TIMELINE,
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G_PARAM_READWRITE));
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g_object_class_install_property
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(object_class, PROP_FUNC,
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g_param_spec_pointer ("func",
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"Alpha function",
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"Alpha function",
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G_PARAM_READWRITE));
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g_object_class_install_property
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(object_class, PROP_ALPHA,
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g_param_spec_int ("alpha",
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"Alpha value",
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"Alpha value",
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0,
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CLUTTER_ALPHA_MAX_ALPHA,
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0,
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G_PARAM_READABLE));
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}
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static void
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clutter_alpha_init (ClutterAlpha *self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE(self,
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CLUTTER_TYPE_ALPHA,
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ClutterAlphaPrivate);
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self->priv->func = CLUTTER_ALPHA_RAMP_INC;
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}
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/**
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* clutter_alpha_get_alpha:
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* @alpha: A #ClutterAlpha
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*
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* Query the current alpha value.
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*
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* Return Value: The current alpha value for the alpha
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*/
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gint32
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clutter_alpha_get_alpha (ClutterAlpha *alpha)
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{
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g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), FALSE);
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return alpha->priv->alpha;
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}
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/**
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* clutter_alpha_set_func:
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* @alpha: A #ClutterAlpha
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* @func: A #ClutterAlphaAlphaFunc
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*
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*/
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void
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clutter_alpha_set_func (ClutterAlpha *alpha,
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ClutterAlphaFunc func)
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{
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alpha->priv->func = func;
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}
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/**
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* clutter_alpha_set_timeline:
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* @alpha: A #ClutterAlpha
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* @timeline: A #ClutterTimeline
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*
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* Binds @alpha to @timeline.
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*/
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void
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clutter_alpha_set_timeline (ClutterAlpha *alpha,
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ClutterTimeline *timeline)
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{
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if (alpha->priv->timeline)
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{
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g_signal_handler_disconnect (alpha->priv->timeline,
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alpha->priv->timeline_new_frame_id);
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g_object_unref (alpha->priv->timeline);
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alpha->priv->timeline = NULL;
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}
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if (timeline)
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{
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alpha->priv->timeline = g_object_ref (timeline);
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alpha->priv->timeline_new_frame_id =
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g_signal_connect (alpha->priv->timeline,
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"new-frame",
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G_CALLBACK (timeline_new_frame_cb),
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alpha);
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}
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}
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/**
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* clutter_alpha_get_timeline:
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* @alpha: A #ClutterAlpha
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*
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* Return value: The #ClutterTimeline
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*/
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ClutterTimeline *
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clutter_alpha_get_timeline (ClutterAlpha *alpha)
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{
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return alpha->priv->timeline;
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}
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/**
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* clutter_alpha_new:
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* @timeline: #ClutterTimeline timeline
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* @func: #ClutterAlphaFunc alpha function
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*
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* Create a new #ClutterAlpha instance.
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*
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* Return Value: a new #ClutterAlpha
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*/
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ClutterAlpha*
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clutter_alpha_new (ClutterTimeline *timeline,
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ClutterAlphaFunc func)
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{
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return g_object_new (CLUTTER_TYPE_ALPHA,
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"timeline", timeline,
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"func", func,
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NULL);
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}
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