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MetaBackground: untie background rendering from MetaScreen

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Rather than associating background textures with a MetaScreen, associate
them with GnomeBG objects. This allows to have different actors that render
different backgrounds, without losing the ability to share textures.

https://bugzilla.gnome.org/show_bug.cgi?id=688210
This commit is contained in:
Giovanni Campagna 2012-12-17 19:01:45 +01:00
parent 5a83ef71c9
commit 0a1ee4aa54
7 changed files with 223 additions and 140 deletions
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2
src/Makefile.am
View File

@ -227,7 +227,7 @@ typelib_DATA = Meta-$(api_version).typelib
INTROSPECTION_GIRS = Meta-$(api_version).gir
Meta-$(api_version).gir: libmutter.la
@META_GIR@_INCLUDES = GObject-2.0 GDesktopEnums-3.0 Gdk-3.0 Gtk-3.0 Clutter-1.0 xlib-2.0 xfixes-4.0 Cogl-1.0
@META_GIR@_INCLUDES = GObject-2.0 GDesktopEnums-3.0 Gdk-3.0 Gtk-3.0 Clutter-1.0 xlib-2.0 xfixes-4.0 Cogl-1.0 GnomeDesktop-3.0
@META_GIR@_EXPORT_PACKAGES = libmutter
@META_GIR@_CFLAGS = $(INCLUDES)
@META_GIR@_LIBS = libmutter.la

4
src/compositor/compositor.c
View File

@ -573,7 +573,7 @@ meta_compositor_manage_screen (MetaCompositor *compositor,
}
info->window_group = meta_window_group_new (screen);
info->background_actor = meta_background_actor_new_for_screen (screen);
info->background_actor = meta_background_actor_new (screen, NULL);
info->overlay_group = clutter_group_new ();
clutter_container_add (CLUTTER_CONTAINER (info->window_group),
@ -1183,8 +1183,6 @@ meta_compositor_sync_screen_size (MetaCompositor *compositor,
XResizeWindow (xdisplay, xwin, width, height);
meta_background_actor_screen_size_changed (screen);
meta_verbose ("Changed size for stage on screen %d to %dx%d\n",
meta_screen_get_screen_number (screen),
width, height);

3
src/compositor/meta-background-actor-private.h
View File

@ -12,9 +12,6 @@
void meta_background_actor_set_visible_region (MetaBackgroundActor *self,
cairo_region_t *visible_region);
void meta_background_actor_update (MetaScreen *screen);
void meta_background_actor_screen_size_changed (MetaScreen *screen);
GTask *meta_background_draw_async (MetaScreen *screen,
GnomeBG *bg,
GCancellable *cancellable,

345
src/compositor/meta-background-actor.c
View File

@ -36,40 +36,39 @@
#define CROSSFADE_DURATION 1000
/* We allow creating multiple MetaBackgroundActors for the same MetaScreen to
/* We allow creating multiple MetaBackgroundActors for the same MetaScreen and GnomeBG to
* allow different rendering options to be set for different copies.
* But we want to share the same underlying CoglTexture for efficiency and
* to avoid driver bugs that might occur if we created multiple CoglTexturePixmaps
* for the same pixmap.
* But we want to share the same underlying CoglTexture for efficiency.
*
* This structure holds common information.
*/
typedef struct _MetaScreenBackground MetaScreenBackground;
typedef struct _MetaBackground MetaBackground;
struct _MetaScreenBackground
struct _MetaBackground
{
MetaScreen *screen;
GSList *actors;
GSettings *settings;
GnomeBG *bg;
MetaScreen *screen;
GCancellable *cancellable;
float texture_width;
float texture_height;
CoglTexture *old_texture;
CoglTexture *texture;
CoglMaterialWrapMode wrap_mode;
GTask *rendering_task;
};
struct _MetaBackgroundActorPrivate
{
MetaScreenBackground *background;
MetaScreen *screen;
MetaBackground *background;
GnomeBG *settings;
CoglPipeline *single_pipeline;
CoglPipeline *crossfade_pipeline;
CoglPipeline *pipeline;
CoglMaterialWrapMode wrap_mode;
cairo_region_t *visible_region;
float dim_factor;
@ -81,6 +80,9 @@ enum
{
PROP_0,
PROP_SCREEN,
PROP_SETTINGS,
PROP_DIM_FACTOR,
PROP_CROSSFADE_PROGRESS,
@ -91,68 +93,89 @@ static GParamSpec *obj_props[PROP_LAST];
G_DEFINE_TYPE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR);
static void clear_old_texture (MetaScreenBackground *background);
static void set_texture (MetaScreenBackground *background,
CoglHandle texture);
static void meta_background_update (GnomeBG *bg,
MetaBackground *background);
static void meta_background_actor_screen_size_changed (MetaScreen *screen,
MetaBackgroundActor *actor);
static void meta_background_actor_constructed (GObject *object);
static void clear_old_texture (MetaBackground *background);
static void set_texture (MetaBackground *background,
CoglHandle texture);
static void
free_screen_background (MetaScreenBackground *background)
meta_background_free (MetaBackground *background)
{
set_texture (background, COGL_INVALID_HANDLE);
g_cancellable_cancel (background->cancellable);
g_object_unref (background->cancellable);
g_object_unref (background->bg);
g_object_unref (background->settings);
g_clear_object (&background->rendering_task);
g_slice_free (MetaBackground, background);
}
static void
on_settings_changed (GSettings *settings,
const char *key,
MetaScreenBackground *background)
on_settings_changed (GSettings *settings,
const char *key,
GnomeBG *bg)
{
gnome_bg_load_from_preferences (background->bg,
background->settings);
gnome_bg_load_from_preferences (bg, settings);
}
static MetaScreenBackground *
meta_screen_background_get (MetaScreen *screen)
static GnomeBG *
meta_background_get_default_settings (void)
{
MetaScreenBackground *background;
GSettings *settings;
GnomeBG *bg;
background = g_object_get_data (G_OBJECT (screen), "meta-screen-background");
if (background == NULL)
settings = g_settings_new ("org.gnome.desktop.background");
bg = gnome_bg_new ();
g_signal_connect (settings, "changed",
G_CALLBACK (on_settings_changed), bg);
on_settings_changed (settings, NULL, bg);
/* Just to keep settings alive */
g_object_set_data_full (G_OBJECT (bg), "g-settings",
g_object_ref (settings), g_object_unref);
g_object_unref (settings);
return bg;
}
static MetaBackground *
meta_background_get (MetaScreen *screen,
GnomeBG *bg)
{
static GQuark background_quark;
MetaBackground *background;
if (G_UNLIKELY (background_quark == 0))
background_quark = g_quark_from_static_string ("meta-background");
background = g_object_get_qdata (G_OBJECT (bg), background_quark);
if (G_UNLIKELY (background == NULL))
{
background = g_new0 (MetaScreenBackground, 1);
background = g_slice_new0 (MetaBackground);
g_object_set_qdata_full (G_OBJECT (bg), background_quark,
background, (GDestroyNotify) meta_background_free);
background->screen = screen;
g_object_set_data_full (G_OBJECT (screen), "meta-screen-background",
background, (GDestroyNotify) free_screen_background);
background->settings = g_settings_new ("org.gnome.desktop.background");
g_signal_connect (background->settings, "changed",
G_CALLBACK (on_settings_changed), background);
background->bg = gnome_bg_new ();
g_signal_connect_object (background->bg, "transitioned",
G_CALLBACK (meta_background_actor_update),
screen, G_CONNECT_SWAPPED);
g_signal_connect_object (background->bg, "changed",
G_CALLBACK (meta_background_actor_update),
screen, G_CONNECT_SWAPPED);
background->texture_width = -1;
background->texture_height = -1;
background->wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
on_settings_changed (background->settings, NULL, background);
g_signal_connect (bg, "transitioned",
G_CALLBACK (meta_background_update), background);
g_signal_connect (bg, "changed",
G_CALLBACK (meta_background_update), background);
/* GnomeBG has queued a changed event, but we need to start rendering now,
or it will be too late when we paint the first frame.
*/
g_object_set_data (G_OBJECT (background->bg), "ignore-pending-change", GINT_TO_POINTER (TRUE));
meta_background_actor_update (screen);
g_object_set_data (G_OBJECT (bg), "ignore-pending-change", GINT_TO_POINTER (TRUE));
meta_background_update (bg, background);
}
return background;
@ -170,10 +193,10 @@ update_actor_pipeline (MetaBackgroundActor *self,
priv->is_crossfading = TRUE;
cogl_pipeline_set_layer_texture (priv->pipeline, 0, priv->background->old_texture);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0, priv->background->wrap_mode);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0, priv->wrap_mode);
cogl_pipeline_set_layer_texture (priv->pipeline, 1, priv->background->texture);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 1, priv->background->wrap_mode);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 1, priv->wrap_mode);
}
else
{
@ -181,7 +204,7 @@ update_actor_pipeline (MetaBackgroundActor *self,
priv->is_crossfading = FALSE;
cogl_pipeline_set_layer_texture (priv->pipeline, 0, priv->background->texture);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0, priv->background->wrap_mode);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0, priv->wrap_mode);
}
clutter_actor_queue_redraw (CLUTTER_ACTOR (self));
@ -196,7 +219,7 @@ crossfade_completed (ClutterTimeline *timeline,
}
static void
clear_old_texture (MetaScreenBackground *background)
clear_old_texture (MetaBackground *background)
{
if (background->old_texture != COGL_INVALID_HANDLE)
{
@ -206,12 +229,13 @@ clear_old_texture (MetaScreenBackground *background)
}
static void
set_texture (MetaScreenBackground *background,
CoglHandle texture)
set_texture (MetaBackground *background,
CoglHandle texture)
{
GSList *l;
gboolean crossfade;
int width, height;
CoglMaterialWrapMode wrap_mode;
if (background->old_texture != COGL_INVALID_HANDLE)
{
@ -246,14 +270,15 @@ set_texture (MetaScreenBackground *background,
* side of the image via bilinear filtering.
*/
if (width == background->texture_width && height == background->texture_height)
background->wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
else
background->wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
for (l = background->actors; l; l = l->next)
{
MetaBackgroundActor *actor = l->data;
actor->priv->wrap_mode = wrap_mode;
update_actor_pipeline (actor, crossfade);
if (crossfade)
@ -281,29 +306,8 @@ set_texture (MetaScreenBackground *background,
}
}
static void
update_wrap_mode (MetaScreenBackground *background)
{
GSList *l;
int width, height;
meta_screen_get_size (background->screen, &width, &height);
if (width == background->texture_width && height == background->texture_height)
background->wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
else
background->wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
for (l = background->actors; l != NULL; l++)
{
MetaBackgroundActor *actor = l->data;
update_actor_pipeline (actor, actor->priv->is_crossfading);
}
}
static inline void
meta_background_ensure_rendered (MetaScreenBackground *background)
meta_background_ensure_rendered (MetaBackground *background)
{
if (G_LIKELY (background->rendering_task == NULL ||
background->texture != COGL_INVALID_HANDLE))
@ -326,8 +330,9 @@ meta_background_actor_dispose (GObject *object)
priv->background = NULL;
}
g_clear_pointer(&priv->single_pipeline, cogl_object_unref);
g_clear_pointer(&priv->crossfade_pipeline, cogl_object_unref);
g_clear_pointer (&priv->single_pipeline, cogl_object_unref);
g_clear_pointer (&priv->crossfade_pipeline, cogl_object_unref);
g_clear_object (&priv->settings);
G_OBJECT_CLASS (meta_background_actor_parent_class)->dispose (object);
}
@ -342,7 +347,7 @@ meta_background_actor_get_preferred_width (ClutterActor *actor,
MetaBackgroundActorPrivate *priv = self->priv;
int width, height;
meta_screen_get_size (priv->background->screen, &width, &height);
meta_screen_get_size (priv->screen, &width, &height);
if (min_width_p)
*min_width_p = width;
@ -361,7 +366,7 @@ meta_background_actor_get_preferred_height (ClutterActor *actor,
MetaBackgroundActorPrivate *priv = self->priv;
int width, height;
meta_screen_get_size (priv->background->screen, &width, &height);
meta_screen_get_size (priv->screen, &width, &height);
if (min_height_p)
*min_height_p = height;
@ -381,7 +386,7 @@ meta_background_actor_paint (ClutterActor *actor)
meta_background_ensure_rendered (priv->background);
meta_screen_get_size (priv->background->screen, &width, &height);
meta_screen_get_size (priv->screen, &width, &height);
color_component = (int)(0.5 + opacity * priv->dim_factor);
@ -440,7 +445,7 @@ meta_background_actor_get_paint_volume (ClutterActor *actor,
MetaBackgroundActorPrivate *priv = self->priv;
int width, height;
meta_screen_get_size (priv->background->screen, &width, &height);
meta_screen_get_size (priv->screen, &width, &height);
clutter_paint_volume_set_width (volume, width);
clutter_paint_volume_set_height (volume, height);
@ -480,6 +485,31 @@ meta_background_actor_set_dim_factor (MetaBackgroundActor *self,
g_object_notify_by_pspec (G_OBJECT (self), obj_props[PROP_DIM_FACTOR]);
}
static void
meta_background_actor_set_screen (MetaBackgroundActor *self,
MetaScreen *screen)
{
self->priv->screen = screen;
g_object_add_weak_pointer (G_OBJECT (screen), (void**) &self->priv->screen);
g_signal_connect_object (screen, "monitors-changed",
G_CALLBACK (meta_background_actor_screen_size_changed), self, 0);
}
static void
meta_background_actor_set_settings (MetaBackgroundActor *self,
GnomeBG *settings)
{
MetaBackgroundActorPrivate *priv;
priv = self->priv;
if (settings)
priv->settings = g_object_ref (settings);
else
priv->settings = meta_background_get_default_settings ();
}
static void
meta_background_actor_get_property(GObject *object,
guint prop_id,
@ -496,6 +526,13 @@ meta_background_actor_get_property(GObject *object,
break;
case PROP_CROSSFADE_PROGRESS:
g_value_set_float (value, priv->crossfade_progress);
break;
case PROP_SETTINGS:
g_value_set_object (value, priv->settings);
break;
case PROP_SCREEN:
g_value_set_object (value, priv->screen);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -518,6 +555,12 @@ meta_background_actor_set_property(GObject *object,
case PROP_CROSSFADE_PROGRESS:
meta_background_actor_set_crossfade_progress (self, g_value_get_float (value));
break;
case PROP_SETTINGS:
meta_background_actor_set_settings (self, GNOME_BG (g_value_get_object (value)));
break;
case PROP_SCREEN:
meta_background_actor_set_screen (self, META_SCREEN (g_value_get_object (value)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -536,12 +579,37 @@ meta_background_actor_class_init (MetaBackgroundActorClass *klass)
object_class->dispose = meta_background_actor_dispose;
object_class->get_property = meta_background_actor_get_property;
object_class->set_property = meta_background_actor_set_property;
object_class->constructed = meta_background_actor_constructed;
actor_class->get_preferred_width = meta_background_actor_get_preferred_width;
actor_class->get_preferred_height = meta_background_actor_get_preferred_height;
actor_class->paint = meta_background_actor_paint;
actor_class->get_paint_volume = meta_background_actor_get_paint_volume;
/**
* MetaBackgroundActor:screen:
*
* The #MetaScreen this actor is operating on.
*/
pspec = g_param_spec_object ("screen",
"Screen",
"The screen the actor is on",
META_TYPE_SCREEN,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
obj_props[PROP_SCREEN] = pspec;
/**
* MetaBackgroundActor:settings:
*
* The #GnomeBG object holding settings for this background.
*/
pspec = g_param_spec_object ("settings",
"Settings",
"Object holding required information to render a background",
GNOME_TYPE_BG,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
obj_props[PROP_SETTINGS] = pspec;
/**
* MetaBackgroundActor:dim-factor:
*
@ -578,28 +646,22 @@ meta_background_actor_init (MetaBackgroundActor *self)
META_TYPE_BACKGROUND_ACTOR,
MetaBackgroundActorPrivate);
priv->dim_factor = 1.0;
priv->crossfade_progress = 0.0;
priv->wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
}
/**
* meta_background_actor_new:
* @screen: the #MetaScreen
*
* Creates a new actor to draw the background for the given screen.
*
* Return value: the newly created background actor
*/
ClutterActor *
meta_background_actor_new_for_screen (MetaScreen *screen)
static void
meta_background_actor_constructed (GObject *object)
{
MetaBackgroundActor *self;
MetaBackgroundActorPrivate *priv;
g_return_val_if_fail (META_IS_SCREEN (screen), NULL);
G_OBJECT_CLASS (meta_background_actor_parent_class)->constructed (object);
self = g_object_new (META_TYPE_BACKGROUND_ACTOR, NULL);
self = META_BACKGROUND_ACTOR (object);
priv = self->priv;
priv->background = meta_screen_background_get (screen);
priv->background = meta_background_get (priv->screen, priv->settings);
priv->background->actors = g_slist_prepend (priv->background->actors, self);
priv->single_pipeline = meta_create_texture_material (priv->background->texture);
@ -608,8 +670,28 @@ meta_background_actor_new_for_screen (MetaScreen *screen)
if (priv->background->texture != COGL_INVALID_HANDLE)
update_actor_pipeline (self, FALSE);
}
return CLUTTER_ACTOR (self);
/**
* meta_background_actor_new:
* @screen: the #MetaScreen
* @settings: (allow-none): a #GnomeBG holding the background configuration,
* or %NULL to pick the default one.
*
* Creates a new actor to draw the background for the given screen.
*
* Return value: the newly created background actor
*/
ClutterActor *
meta_background_actor_new (MetaScreen *screen,
GnomeBG *settings)
{
g_return_val_if_fail (META_IS_SCREEN (screen), NULL);
return g_object_new (META_TYPE_BACKGROUND_ACTOR,
"screen", screen,
"settings", settings,
NULL);
}
static void
@ -617,25 +699,26 @@ on_background_drawn (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
MetaScreen *screen = META_SCREEN (object);
MetaScreenBackground *background;
MetaBackground *background;
CoglHandle texture;
GError *error;
background = meta_screen_background_get (screen);
g_clear_object (&background->rendering_task);
g_clear_object (&background->cancellable);
error = NULL;
texture = meta_background_draw_finish (screen, result, &error);
texture = meta_background_draw_finish (META_SCREEN (object), result, &error);
/* Don't even access user_data if cancelled, it might be already
freed */
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
{
g_error_free (error);
return;
}
background = user_data;
g_clear_object (&background->rendering_task);
g_clear_object (&background->cancellable);
if (texture != COGL_INVALID_HANDLE)
{
set_texture (background, texture);
@ -650,21 +733,19 @@ on_background_drawn (GObject *object,
}
}
/**
* meta_background_actor_update:
* @screen: a #MetaScreen
/*
* meta_background_update:
* @bg: the #GnomeBG that triggered the update
* @background: a #MetaBackground
*
* Forces a redraw of the background. The redraw happens asynchronously in
* a thread, and the actual on screen change is therefore delayed until
* the redraw is finished.
*/
void
meta_background_actor_update (MetaScreen *screen)
meta_background_update (GnomeBG *bg,
MetaBackground *background)
{
MetaScreenBackground *background;
background = meta_screen_background_get (screen);
if (background->cancellable)
{
g_cancellable_cancel (background->cancellable);
@ -674,10 +755,10 @@ meta_background_actor_update (MetaScreen *screen)
g_clear_object (&background->rendering_task);
background->cancellable = g_cancellable_new ();
background->rendering_task = meta_background_draw_async (screen,
background->bg,
background->rendering_task = meta_background_draw_async (background->screen,
bg,
background->cancellable,
on_background_drawn, NULL);
on_background_drawn, background);
}
/**
@ -708,7 +789,7 @@ meta_background_actor_set_visible_region (MetaBackgroundActor *self,
if (visible_region)
{
cairo_rectangle_int_t screen_rect = { 0 };
meta_screen_get_size (priv->background->screen, &screen_rect.width, &screen_rect.height);
meta_screen_get_size (priv->screen, &screen_rect.width, &screen_rect.height);
/* Doing the intersection here is probably unnecessary - MetaWindowGroup
* should never compute a visible area that's larger than the root screen!
@ -719,22 +800,26 @@ meta_background_actor_set_visible_region (MetaBackgroundActor *self,
}
}
/**
* meta_background_actor_screen_size_changed:
* @screen: a #MetaScreen
*
* Called by the compositor when the size of the #MetaScreen changes
*/
void
meta_background_actor_screen_size_changed (MetaScreen *screen)
static void
meta_background_actor_screen_size_changed (MetaScreen *screen,
MetaBackgroundActor *actor)
{
MetaScreenBackground *background = meta_screen_background_get (screen);
GSList *l;
MetaBackgroundActorPrivate *priv;
MetaBackground *background;
int width, height;
update_wrap_mode (background);
priv = actor->priv;
background = priv->background;
for (l = background->actors; l; l = l->next)
clutter_actor_queue_relayout (l->data);
meta_screen_get_size (screen, &width, &height);
if (width == background->texture_width && height == background->texture_height)
priv->wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
else
priv->wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
update_actor_pipeline (actor, actor->priv->is_crossfading);
clutter_actor_queue_relayout (CLUTTER_ACTOR (actor));
}
/**

2
src/core/screen.c
View File

@ -239,7 +239,7 @@ meta_screen_class_init (MetaScreenClass *klass)
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (MetaScreenClass, monitors_changed),
NULL, NULL, NULL,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
g_object_class_install_property (object_class,

2
src/libmutter.pc.in
View File

@ -12,7 +12,7 @@ mutter_plugin_api_version=@MUTTER_PLUGIN_API_VERSION@
Name: libmutter
Description: Mutter window manager library
Requires: gsettings-desktop-schemas gtk+-3.0 @CLUTTER_PACKAGE@ x11
Requires: gsettings-desktop-schemas gtk+-3.0 @CLUTTER_PACKAGE@ x11 gnome-desktop-3.0
Version: @VERSION@
Libs: -L${libdir} -lmutter
Cflags: -I${includedir}/mutter -DMUTTER_MAJOR_VERSION=${mutter_major_version} -DMUTTER_MINOR_VERSION=${mutter_minor_version} -DMUTTER_MICRO_VERSION=${mutter_micro_version} -DMUTTER_PLUGIN_API_VERSION=${mutter_plugin_api_version}

5
src/meta/meta-background-actor.h
View File

@ -24,6 +24,8 @@
#define META_BACKGROUND_ACTOR_H
#include <clutter/clutter.h>
#define GNOME_DESKTOP_USE_UNSTABLE_API
#include <libgnome-desktop/gnome-bg.h>
#include <meta/screen.h>
@ -60,7 +62,8 @@ struct _MetaBackgroundActor
GType meta_background_actor_get_type (void);
ClutterActor *meta_background_actor_new_for_screen (MetaScreen *screen);
ClutterActor *meta_background_actor_new (MetaScreen *screen,
GnomeBG *settings);
/**
* MetaSnippetHook: