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701440efd8
This adds a virtual to ClutterActor so that an actor subclass can report whether it has overlapping primitives. ClutterActor uses this to determine whether it needs to use ClutterFlattenEffect to implement the opacity property. The default implementation of the virtual returns TRUE which means that most actors will end up being redirected offscreen when the opacity != 255. ClutterTexture and ClutterRectangle override this to return FALSE because they should never need to be redirected. ClutterClone overrides it to divert to the source. The values for the ClutterOffscreenRedirect enum have changed to: AUTOMATIC_FOR_OPACITY The actor will only be redirected if has_overlaps returns TRUE and the opacity is < 255 ALWAYS_FOR_OPACITY The actor will always be redirected if the opacity < 255 regardless of the return value of has_overlaps ALWAYS The actor will always be redirected offscreen. This means that the property can't be used to prevent the actor from being redirected but only to increase the likelihood that it will be redirected. ClutterActor now adds and removes the flatten effect depending on whether flattening is needed directly in clutter_actor_paint(). There are new internal versions of add/remove_effect that don't queue a redraw. This means that ClutterFlattenEffect is now just a no-op subclass of ClutterOffscreen. It is only needed because ClutterOffscreen is abstract. Removing the effect also makes it so that the cached image will be freed as soon as an actor is repainted without being flattened.
461 lines
13 KiB
C
461 lines
13 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:clutter-clone
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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-actor-private.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-paint-volume-private.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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PROP_LAST
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};
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static GParamSpec *obj_props[PROP_LAST];
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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 clutter_clone_set_source_internal (ClutterClone *clone,
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ClutterActor *source);
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static void
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clutter_clone_get_preferred_width (ClutterActor *self,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *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 (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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gfloat for_width,
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gfloat *min_height_p,
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gfloat *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 (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_apply_transform (ClutterActor *self, CoglMatrix *matrix)
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{
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ClutterClonePrivate *priv = CLUTTER_CLONE (self)->priv;
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ClutterGeometry geom;
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ClutterGeometry source_geom;
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gfloat x_scale;
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gfloat y_scale;
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/* First chain up and apply all the standard ClutterActor
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* transformations... */
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CLUTTER_ACTOR_CLASS (clutter_clone_parent_class)->apply_transform (self,
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matrix);
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/* if we don't have a source, nothing else to do */
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if (priv->clone_source == NULL)
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return;
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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, &source_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 / source_geom.width;
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y_scale = (gfloat) geom.height / source_geom.height;
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cogl_matrix_scale (matrix, x_scale, y_scale, x_scale);
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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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gboolean was_unmapped = FALSE;
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if (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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/* The final bits of magic:
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* - We need to override the paint opacity of the actor with our own
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* opacity.
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* - We need to inform the actor that it's in a clone paint (for the function
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* clutter_actor_is_in_clone_paint())
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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_in_clone_paint (priv->clone_source, TRUE);
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_clutter_actor_set_opacity_override (priv->clone_source,
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clutter_actor_get_paint_opacity (self));
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_clutter_actor_set_enable_model_view_transform (priv->clone_source, FALSE);
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if (!CLUTTER_ACTOR_IS_MAPPED (priv->clone_source))
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{
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_clutter_actor_set_enable_paint_unmapped (priv->clone_source, TRUE);
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was_unmapped = TRUE;
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}
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_clutter_actor_push_clone_paint ();
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clutter_actor_paint (priv->clone_source);
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_clutter_actor_pop_clone_paint ();
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if (was_unmapped)
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_clutter_actor_set_enable_paint_unmapped (priv->clone_source, FALSE);
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_clutter_actor_set_enable_model_view_transform (priv->clone_source, TRUE);
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_clutter_actor_set_opacity_override (priv->clone_source, -1);
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_clutter_actor_set_in_clone_paint (priv->clone_source, FALSE);
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}
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static gboolean
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clutter_clone_get_paint_volume (ClutterActor *self,
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ClutterPaintVolume *volume)
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{
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ClutterClonePrivate *priv = CLUTTER_CLONE (self)->priv;
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const ClutterPaintVolume *source_volume;
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/* if the source is not set the paint volume is defined to be empty */
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if (priv->clone_source == NULL)
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return TRUE;
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/* query the volume of the source actor and simply masquarade it as
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* the clones volume... */
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source_volume = clutter_actor_get_paint_volume (priv->clone_source);
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if (!source_volume)
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return FALSE;
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_clutter_paint_volume_set_from_volume (volume, source_volume);
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_clutter_paint_volume_set_reference_actor (volume, self);
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return TRUE;
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}
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static gboolean
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clutter_clone_has_overlaps (ClutterActor *self)
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{
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ClutterClonePrivate *priv = CLUTTER_CLONE (self)->priv;
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/* The clone has overlaps iff the source has overlaps */
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if (priv->clone_source == NULL)
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return FALSE;
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return clutter_actor_has_overlaps (priv->clone_source);
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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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ClutterAllocationFlags flags)
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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, flags);
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if (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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clutter_actor_allocate_preferred_size (priv->clone_source, flags);
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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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clutter_clone_set_source_internal (CLUTTER_CLONE (gobject), NULL);
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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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g_type_class_add_private (gobject_class, sizeof (ClutterClonePrivate));
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actor_class->apply_transform = clutter_clone_apply_transform;
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actor_class->paint = clutter_clone_paint;
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actor_class->get_paint_volume = clutter_clone_get_paint_volume;
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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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actor_class->has_overlaps = clutter_clone_has_overlaps;
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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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obj_props[PROP_SOURCE] =
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g_param_spec_object ("source",
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P_("Source"),
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P_("Specifies the actor to be cloned"),
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CLUTTER_TYPE_ACTOR,
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G_PARAM_CONSTRUCT |
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_properties (gobject_class,
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PROP_LAST,
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obj_props);
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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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static void
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clone_source_queue_redraw_cb (ClutterActor *source,
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ClutterActor *origin,
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ClutterClone *clone)
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{
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clutter_actor_queue_redraw (CLUTTER_ACTOR (clone));
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}
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static void
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clone_source_queue_relayout_cb (ClutterActor *source,
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ClutterClone *clone)
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{
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clutter_actor_queue_relayout (CLUTTER_ACTOR (clone));
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}
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static void
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clutter_clone_set_source_internal (ClutterClone *clone,
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ClutterActor *source)
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{
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ClutterClonePrivate *priv = clone->priv;
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if (priv->clone_source)
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{
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g_signal_handlers_disconnect_by_func (priv->clone_source,
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(void *) clone_source_queue_redraw_cb,
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clone);
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g_signal_handlers_disconnect_by_func (priv->clone_source,
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(void *) clone_source_queue_relayout_cb,
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clone);
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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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{
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priv->clone_source = g_object_ref (source);
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g_signal_connect (priv->clone_source, "queue-redraw",
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G_CALLBACK (clone_source_queue_redraw_cb), clone);
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g_signal_connect (priv->clone_source, "queue-relayout",
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G_CALLBACK (clone_source_queue_relayout_cb), clone);
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}
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g_object_notify_by_pspec (G_OBJECT (clone), obj_props[PROP_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_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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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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clutter_clone_set_source_internal (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: (transfer none): 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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