8feb99722c
The opacity of the source actor when painted from the clone should be combined with the opacity of the clone as well as the clone's parents, instead of just the parents.
356 lines
9.9 KiB
C
356 lines
9.9 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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* Authored By: Robert Bragg <robert@linux.intel.com>
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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:clutterclone
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* @short_description: An actor that displays a clone of a source actor
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*
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* #ClutterClone is a #ClutterActor which draws with the paint
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* function of another actor, scaled to fit its own allocation.
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*
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* #ClutterClone can be used to efficiently clone any other actor.
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*
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* <note><para>This is different from clutter_texture_new_from_actor()
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* which requires support for FBOs in the underlying GL
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* implementation.</para></note>
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*
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* #ClutterClone is available since Clutter 1.0
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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-color.h"
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#include "clutter-clone.h"
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#include "clutter-debug.h"
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#include "clutter-main.h"
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#include "clutter-private.h"
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#include "cogl/cogl.h"
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G_DEFINE_TYPE (ClutterClone, clutter_clone, CLUTTER_TYPE_ACTOR);
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enum
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{
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PROP_0,
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PROP_SOURCE
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};
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#define CLUTTER_CLONE_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_CLONE, ClutterClonePrivate))
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struct _ClutterClonePrivate
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{
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ClutterActor *clone_source;
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};
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static void
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clutter_clone_get_preferred_width (ClutterActor *self,
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ClutterUnit for_height,
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ClutterUnit *min_width_p,
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ClutterUnit *natural_width_p)
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{
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ClutterClonePrivate *priv = CLUTTER_CLONE (self)->priv;
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ClutterActor *clone_source = priv->clone_source;
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if (G_UNLIKELY (clone_source == NULL))
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{
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if (min_width_p)
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*min_width_p = 0;
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if (natural_width_p)
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*natural_width_p = 0;
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}
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else
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clutter_actor_get_preferred_width (clone_source,
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for_height,
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min_width_p,
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natural_width_p);
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}
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static void
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clutter_clone_get_preferred_height (ClutterActor *self,
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ClutterUnit for_width,
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ClutterUnit *min_height_p,
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ClutterUnit *natural_height_p)
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{
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ClutterClonePrivate *priv = CLUTTER_CLONE (self)->priv;
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ClutterActor *clone_source = priv->clone_source;
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if (G_UNLIKELY (clone_source == NULL))
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{
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if (min_height_p)
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*min_height_p = 0;
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if (natural_height_p)
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*natural_height_p = 0;
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}
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else
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clutter_actor_get_preferred_height (clone_source,
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for_width,
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min_height_p,
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natural_height_p);
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}
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static void
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clutter_clone_paint (ClutterActor *self)
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{
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ClutterClone *clone = CLUTTER_CLONE (self);
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ClutterClonePrivate *priv = clone->priv;
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ClutterGeometry geom, clone_geom;
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gfloat x_scale, y_scale;
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if (G_UNLIKELY (priv->clone_source == NULL))
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return;
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CLUTTER_NOTE (PAINT,
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"painting clone actor '%s'",
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clutter_actor_get_name (self) ? clutter_actor_get_name (self)
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: "unknown");
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/* get our allocated size */
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clutter_actor_get_allocation_geometry (self, &geom);
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/* and get the allocated size of the source */
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clutter_actor_get_allocation_geometry (priv->clone_source, &clone_geom);
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/* We need to scale what the clone-source actor paints to fill our own
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* allocation...
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*/
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x_scale = (gfloat) geom.width / clone_geom.width;
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y_scale = (gfloat) geom.height / clone_geom.height;
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cogl_scale (x_scale, y_scale, 1.0);
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/* The final bits of magic:
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* - We need to make sure that when the clone-source actor's paint
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* method calls clutter_actor_get_paint_opacity, it traverses to
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* us and our parent not it's real parent.
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* - We need to stop clutter_actor_paint applying the model view matrix of
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* the clone source actor.
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*/
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_clutter_actor_set_opacity_parent (priv->clone_source, self);
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_clutter_actor_set_enable_model_view_transform (priv->clone_source, FALSE);
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clutter_actor_paint (priv->clone_source);
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_clutter_actor_set_enable_model_view_transform (priv->clone_source, TRUE);
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_clutter_actor_set_opacity_parent (priv->clone_source, NULL);
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}
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static void
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clutter_clone_allocate (ClutterActor *self,
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const ClutterActorBox *box,
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gboolean origin_changed)
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{
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ClutterClonePrivate *priv = CLUTTER_CLONE (self)->priv;
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ClutterActorClass *parent_class;
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/* chain up */
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parent_class = CLUTTER_ACTOR_CLASS (clutter_clone_parent_class);
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parent_class->allocate (self, box, origin_changed);
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if (G_UNLIKELY (priv->clone_source == NULL))
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return;
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/* we act like a "foster parent" for the source we are cloning;
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* if the source has not been parented we have to force an
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* allocation on it, so that we can paint it correctly from
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* within out paint() implementation. since the actor does not
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* have a parent, and thus it won't be painted by the usual
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* paint cycle, we can safely give it as much size as it requires
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*/
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if (clutter_actor_get_parent (priv->clone_source) == NULL)
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{
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clutter_actor_allocate_preferred_size (priv->clone_source,
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origin_changed);
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}
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}
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static void
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clutter_clone_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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ClutterClone *clone = CLUTTER_CLONE (gobject);
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switch (prop_id)
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{
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case PROP_SOURCE:
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clutter_clone_set_source (clone, g_value_get_object (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_clone_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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ClutterClonePrivate *priv = CLUTTER_CLONE (gobject)->priv;
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switch (prop_id)
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{
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case PROP_SOURCE:
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g_value_set_object (value, priv->clone_source);
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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_clone_dispose (GObject *gobject)
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{
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ClutterClonePrivate *priv = CLUTTER_CLONE (gobject)->priv;
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if (priv->clone_source)
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{
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g_object_unref (priv->clone_source);
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priv->clone_source = NULL;
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}
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G_OBJECT_CLASS (clutter_clone_parent_class)->dispose (gobject);
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}
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static void
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clutter_clone_class_init (ClutterCloneClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
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GParamSpec *pspec = NULL;
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g_type_class_add_private (gobject_class, sizeof (ClutterClonePrivate));
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actor_class->paint = clutter_clone_paint;
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actor_class->get_preferred_width = clutter_clone_get_preferred_width;
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actor_class->get_preferred_height = clutter_clone_get_preferred_height;
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actor_class->allocate = clutter_clone_allocate;
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gobject_class->dispose = clutter_clone_dispose;
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gobject_class->set_property = clutter_clone_set_property;
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gobject_class->get_property = clutter_clone_get_property;
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/**
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* ClutterClone:source:
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*
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* This property specifies the source actor being cloned.
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*
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* Since: 1.0
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*/
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pspec = g_param_spec_object ("source",
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"Source",
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"Specifies the actor to be cloned",
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CLUTTER_TYPE_ACTOR,
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G_PARAM_CONSTRUCT_ONLY |
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (gobject_class, PROP_SOURCE, pspec);
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}
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static void
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clutter_clone_init (ClutterClone *self)
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{
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ClutterClonePrivate *priv;
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self->priv = priv = CLUTTER_CLONE_GET_PRIVATE (self);
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priv->clone_source = NULL;
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}
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/**
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* clutter_clone_new:
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* @source: a #ClutterActor, or %NULL
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*
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* Creates a new #ClutterActor which clones @source/
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*
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* Return value: the newly created #ClutterClone
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*
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* Since: 1.0
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*/
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ClutterActor *
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clutter_clone_new (ClutterActor *source)
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{
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return g_object_new (CLUTTER_TYPE_CLONE, "source", source, NULL);
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}
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/**
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* clutter_clone_set_source:
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* @clone: a #ClutterClone
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* @source: a #ClutterActor, or %NULL
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*
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* Sets @source as the source actor to be cloned by @clone.
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*
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* Since: 1.0
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*/
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void
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clutter_clone_set_source (ClutterClone *clone,
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ClutterActor *source)
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{
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ClutterClonePrivate *priv;
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g_return_if_fail (CLUTTER_IS_CLONE (clone));
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g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source));
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priv = clone->priv;
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if (priv->clone_source)
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{
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g_object_unref (priv->clone_source);
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priv->clone_source = NULL;
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}
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if (source)
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priv->clone_source = g_object_ref (source);
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g_object_notify (G_OBJECT (clone), "source");
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clutter_actor_queue_relayout (CLUTTER_ACTOR (clone));
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}
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/**
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* clutter_clone_get_source:
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* @clone: a #ClutterClone
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*
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* Retrieves the source #ClutterActor being cloned by @clone
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*
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* Return value: the actor source for the clone
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*
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* Since: 1.0
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*/
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ClutterActor *
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clutter_clone_get_source (ClutterClone *clone)
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{
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g_return_val_if_fail (CLUTTER_IS_CLONE (clone), NULL);
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return clone->priv->clone_source;
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}
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