mutter/src/compositor/meta-background-actor.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright 2009 Sander Dijkhuis
* Copyright 2010 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Portions adapted from gnome-shell/src/shell-global.c
*/
/**
* SECTION:meta-background-actor
* @title: MetaBackgroundActor
* @short_description: Actor for painting the root window background
*
*/
#include <config.h>
#include <cogl/cogl-texture-pixmap-x11.h>
#include <clutter/clutter.h>
#include <X11/Xatom.h>
#include "cogl-utils.h"
#include "compositor-private.h"
#include <meta/errors.h>
#include <meta/meta-background.h>
#include "meta-background-actor-private.h"
struct _MetaBackgroundActorPrivate
{
cairo_region_t *clip_region;
};
G_DEFINE_TYPE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR);
static void
meta_background_actor_dispose (GObject *object)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (object);
meta_background_actor_set_clip_region (self, NULL);
G_OBJECT_CLASS (meta_background_actor_parent_class)->dispose (object);
}
static void
meta_background_actor_get_preferred_width (ClutterActor *actor,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
ClutterContent *content;
gfloat width;
content = clutter_actor_get_content (actor);
if (content)
clutter_content_get_preferred_size (content, &width, NULL);
else
width = 0;
if (min_width_p)
*min_width_p = width;
if (natural_width_p)
*natural_width_p = width;
}
static void
meta_background_actor_get_preferred_height (ClutterActor *actor,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
ClutterContent *content;
gfloat height;
content = clutter_actor_get_content (actor);
if (content)
clutter_content_get_preferred_size (content, NULL, &height);
else
height = 0;
if (min_height_p)
*min_height_p = height;
if (natural_height_p)
*natural_height_p = height;
}
static gboolean
meta_background_actor_get_paint_volume (ClutterActor *actor,
ClutterPaintVolume *volume)
{
ClutterContent *content;
gfloat width, height;
content = clutter_actor_get_content (actor);
if (!content)
return FALSE;
clutter_content_get_preferred_size (content, &width, &height);
clutter_paint_volume_set_width (volume, width);
clutter_paint_volume_set_height (volume, height);
return TRUE;
}
static void
meta_background_actor_class_init (MetaBackgroundActorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
g_type_class_add_private (klass, sizeof (MetaBackgroundActorPrivate));
object_class->dispose = meta_background_actor_dispose;
actor_class->get_preferred_width = meta_background_actor_get_preferred_width;
actor_class->get_preferred_height = meta_background_actor_get_preferred_height;
actor_class->get_paint_volume = meta_background_actor_get_paint_volume;
}
static void
meta_background_actor_init (MetaBackgroundActor *self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
META_TYPE_BACKGROUND_ACTOR,
MetaBackgroundActorPrivate);
}
/**
* meta_background_actor_new:
*
* Creates a new actor to draw the background for the given monitor.
* This actor should be associated with a #MetaBackground using
* clutter_actor_set_content()
*
* Return value: the newly created background actor
*/
ClutterActor *
meta_background_actor_new (void)
{
MetaBackgroundActor *self;
self = g_object_new (META_TYPE_BACKGROUND_ACTOR, NULL);
return CLUTTER_ACTOR (self);
}
/**
* meta_background_actor_set_clip_region:
* @self: a #MetaBackgroundActor
* @clip_region: (allow-none): the area of the actor (in allocate-relative
* coordinates) that is visible.
*
* Sets the area of the background that is unobscured by overlapping windows.
* This is used to optimize and only paint the visible portions.
*/
void
meta_background_actor_set_clip_region (MetaBackgroundActor *self,
cairo_region_t *clip_region)
{
MetaBackgroundActorPrivate *priv;
g_return_if_fail (META_IS_BACKGROUND_ACTOR (self));
priv = self->priv;
g_clear_pointer (&priv->clip_region,
(GDestroyNotify)
cairo_region_destroy);
if (clip_region)
priv->clip_region = cairo_region_copy (clip_region);
}
/**
* meta_background_actor_get_clip_region:
* @self: a #MetaBackgroundActor
*
* Return value (transfer full): a #cairo_region_t that represents the part of
* the background not obscured by other #MetaBackgroundActor or
* #MetaWindowActor objects.
*/
cairo_region_t *
meta_background_actor_get_clip_region (MetaBackgroundActor *self)
{
MetaBackgroundActorPrivate *priv = self->priv;
ClutterActorBox content_box;
cairo_rectangle_int_t content_area = { 0 };
cairo_region_t *clip_region;
g_return_val_if_fail (META_IS_BACKGROUND_ACTOR (self), NULL);
if (!priv->clip_region)
return NULL;
clutter_actor_get_content_box (CLUTTER_ACTOR (self), &content_box);
content_area.x = content_box.x1;
content_area.y = content_box.y1;
content_area.width = content_box.x2 - content_box.x1;
content_area.height = content_box.y2 - content_box.y1;
clip_region = cairo_region_create_rectangle (&content_area);
cairo_region_intersect (clip_region, priv->clip_region);
return clip_region;
}