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57a5f2296a
pre_paint() and post_paint() implementations don't need to check whether an effect is disabled: Clutter will not apply an effect unless it is enabled. So remove code which checks whether the effect is enabled or disabled from the example applications and the documentation.
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
#include "cb-background-effect.h"
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G_DEFINE_TYPE (CbBackgroundEffect, cb_background_effect, CLUTTER_TYPE_EFFECT);
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#define CB_BACKGROUND_EFFECT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
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CB_TYPE_BACKGROUND_EFFECT, \
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CbBackgroundEffectPrivate))
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struct _CbBackgroundEffectPrivate
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{
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CoglMaterial *background;
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CoglColor *color;
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};
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/* ClutterEffect implementation */
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/* note that if pre_paint() returns FALSE
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* any post_paint() defined for the effect will not be called
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*/
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static gboolean
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cb_background_effect_pre_paint (ClutterEffect *self)
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{
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ClutterActor *actor;
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gfloat width;
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gfloat height;
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CbBackgroundEffectPrivate *priv;
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priv = CB_BACKGROUND_EFFECT (self)->priv;
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/* get the associated actor's dimensions */
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actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (self));
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clutter_actor_get_size (actor, &width, &height);
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/* draw a grey Cogl rectangle in the background */
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cogl_set_source (priv->background);
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cogl_rectangle (0, 0, width, height);
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return TRUE;
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}
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/* GObject implementation */
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static void
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cb_background_effect_dispose (GObject *gobject)
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{
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CbBackgroundEffectPrivate *priv = CB_BACKGROUND_EFFECT (gobject)->priv;
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if (priv->background != COGL_INVALID_HANDLE)
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{
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cogl_handle_unref (priv->background);
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priv->background = COGL_INVALID_HANDLE;
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}
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if (priv->color != NULL)
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{
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cogl_color_free (priv->color);
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priv->color = NULL;
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}
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G_OBJECT_CLASS (cb_background_effect_parent_class)->dispose (gobject);
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}
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static void
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cb_background_effect_class_init (CbBackgroundEffectClass *klass)
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{
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ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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effect_class->pre_paint = cb_background_effect_pre_paint;
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gobject_class->dispose = cb_background_effect_dispose;
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g_type_class_add_private (klass, sizeof (CbBackgroundEffectPrivate));
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}
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static void
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cb_background_effect_init (CbBackgroundEffect *self)
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{
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CbBackgroundEffectPrivate *priv;
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priv = self->priv = CB_BACKGROUND_EFFECT_GET_PRIVATE (self);
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priv->background = cogl_material_new ();
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/* grey color for filling the background material */
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priv->color = cogl_color_new ();
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cogl_color_init_from_4ub (priv->color, 122, 122, 122, 255);
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cogl_material_set_color (priv->background, priv->color);
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}
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/* public API */
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/**
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* cb_background_effect_new:
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*
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* Creates a new #ClutterEffect which adds a grey background
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* when applied to a rectangular actor.
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*/
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ClutterEffect *
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cb_background_effect_new ()
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{
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return g_object_new (CB_TYPE_BACKGROUND_EFFECT,
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NULL);
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}
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