/usr/include/mutter/meta/meta-background.h is in libmutter-dev 3.18.3-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* meta-background-actor.h: for painting the root window background
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef META_BACKGROUND_H
#define META_BACKGROUND_H
#include <clutter/clutter.h>
#include <gsettings-desktop-schemas/gdesktop-enums.h>
#include <meta/screen.h>
/**
* MetaBackground:
*
* This class handles tracking and painting the root window background.
* By integrating with #MetaWindowGroup we can avoid painting parts of
* the background that are obscured by other windows.
*/
#define META_TYPE_BACKGROUND (meta_background_get_type ())
#define META_BACKGROUND(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_BACKGROUND, MetaBackground))
#define META_BACKGROUND_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_BACKGROUND, MetaBackgroundClass))
#define META_IS_BACKGROUND(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_BACKGROUND))
#define META_IS_BACKGROUND_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_BACKGROUND))
#define META_BACKGROUND_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_BACKGROUND, MetaBackgroundClass))
typedef struct _MetaBackground MetaBackground;
typedef struct _MetaBackgroundClass MetaBackgroundClass;
typedef struct _MetaBackgroundPrivate MetaBackgroundPrivate;
struct _MetaBackgroundClass
{
/*< private >*/
GObjectClass parent_class;
};
struct _MetaBackground
{
GObject parent;
MetaBackgroundPrivate *priv;
};
void meta_background_refresh_all (void);
GType meta_background_get_type (void);
MetaBackground *meta_background_new (MetaScreen *screen);
void meta_background_set_color (MetaBackground *self,
ClutterColor *color);
void meta_background_set_gradient (MetaBackground *self,
GDesktopBackgroundShading shading_direction,
ClutterColor *color,
ClutterColor *second_color);
void meta_background_set_file (MetaBackground *self,
GFile *file,
GDesktopBackgroundStyle style);
void meta_background_set_blend (MetaBackground *self,
GFile *file1,
GFile *file2,
double blend_factor,
GDesktopBackgroundStyle style);
#endif /* META_BACKGROUND_H */
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