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56644dfada
gnome-shell/src/shell-global.c
Owen W. Taylor 56644dfada Close file descriptors on re-exec 
Use code copied from GLib to close all file descriptors before we reexec ourselves
on the restart Alt-F2 command. This fixes serious memory leaks when we have mapped
graphics buffers.

http://bugzilla.gnome.org/show_bug.cgi?id=579776
2009-04-22 15:08:07 -04:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
#include "shell-global.h"
#include "shell-wm.h"
#include "display.h"
#include <clutter/glx/clutter-glx.h>
#include <clutter/x11/clutter-x11.h>
#include <gdk/gdkx.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dbus/dbus-glib.h>
#include <libgnomeui/gnome-thumbnail.h>
#define SHELL_DBUS_SERVICE "org.gnome.Shell"
static void grab_notify (GtkWidget *widget, gboolean is_grab, gpointer user_data);
struct _ShellGlobal {
GObject parent;
/* We use this window to get a notification from GTK+ when
* a widget in our process does a GTK+ grab. See
* http://bugzilla.gnome.org/show_bug.cgi?id=570641
*
* This window is never mapped or shown.
*/
GtkWindow *grab_notifier;
gboolean grab_active;
/* See shell_global_set_stage_input_area */
int input_x;
int input_y;
int input_width;
int input_height;
MutterPlugin *plugin;
ShellWM *wm;
gboolean keyboard_grabbed;
const char *imagedir;
/* Displays the root window; see shell_global_create_root_pixmap_actor() */
ClutterGLXTexturePixmap *root_pixmap;
};
enum {
PROP_0,
PROP_OVERLAY_GROUP,
PROP_SCREEN,
PROP_SCREEN_WIDTH,
PROP_SCREEN_HEIGHT,
PROP_STAGE,
PROP_WINDOW_GROUP,
PROP_WINDOW_MANAGER,
PROP_IMAGEDIR
};
/* Signals */
enum
{
PANEL_RUN_DIALOG,
PANEL_MAIN_MENU,
LAST_SIGNAL
};
G_DEFINE_TYPE(ShellGlobal, shell_global, G_TYPE_OBJECT);
static guint shell_global_signals [LAST_SIGNAL] = { 0 };
static void
shell_global_set_property(GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_global_get_property(GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ShellGlobal *global = SHELL_GLOBAL (object);
switch (prop_id)
{
case PROP_OVERLAY_GROUP:
g_value_set_object (value, mutter_plugin_get_overlay_group (global->plugin));
break;
case PROP_SCREEN:
g_value_set_object (value, mutter_plugin_get_screen (global->plugin));
break;
case PROP_SCREEN_WIDTH:
{
int width, height;
mutter_plugin_query_screen_size (global->plugin, &width, &height);
g_value_set_int (value, width);
}
break;
case PROP_SCREEN_HEIGHT:
{
int width, height;
mutter_plugin_query_screen_size (global->plugin, &width, &height);
g_value_set_int (value, height);
}
break;
case PROP_STAGE:
g_value_set_object (value, mutter_plugin_get_stage (global->plugin));
break;
case PROP_WINDOW_GROUP:
g_value_set_object (value, mutter_plugin_get_window_group (global->plugin));
break;
case PROP_WINDOW_MANAGER:
g_value_set_object (value, global->wm);
break;
case PROP_IMAGEDIR:
g_value_set_string (value, global->imagedir);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_global_init (ShellGlobal *global)
{
const char *datadir = g_getenv ("GNOME_SHELL_DATADIR");
char *imagedir;
if (!datadir)
datadir = GNOME_SHELL_DATADIR;
/* We make sure imagedir ends with a '/', since the JS won't have
* access to g_build_filename() and so will end up just
* concatenating global.imagedir to a filename.
*/
imagedir = g_build_filename (datadir, "images/", NULL);
if (g_file_test (imagedir, G_FILE_TEST_IS_DIR))
global->imagedir = imagedir;
else
{
g_free (imagedir);
global->imagedir = g_strdup_printf ("%s/", datadir);
}
global->grab_notifier = GTK_WINDOW (gtk_window_new (GTK_WINDOW_TOPLEVEL));
g_signal_connect (global->grab_notifier, "grab-notify", G_CALLBACK (grab_notify), global);
global->grab_active = FALSE;
global->root_pixmap = NULL;
}
static void
shell_global_class_init (ShellGlobalClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->get_property = shell_global_get_property;
gobject_class->set_property = shell_global_set_property;
shell_global_signals[PANEL_RUN_DIALOG] =
g_signal_new ("panel-run-dialog",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ShellGlobalClass, panel_run_dialog),
NULL, NULL,
g_cclosure_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
shell_global_signals[PANEL_MAIN_MENU] =
g_signal_new ("panel-main-menu",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ShellGlobalClass, panel_main_menu),
NULL, NULL,
g_cclosure_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
g_object_class_install_property (gobject_class,
PROP_OVERLAY_GROUP,
g_param_spec_object ("overlay-group",
"Overlay Group",
"Actor holding objects that appear above the desktop contents",
CLUTTER_TYPE_ACTOR,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_SCREEN,
g_param_spec_object ("screen",
"Screen",
"Metacity screen object for the shell",
META_TYPE_SCREEN,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_SCREEN_WIDTH,
g_param_spec_int ("screen-width",
"Screen Width",
"Screen width, in pixels",
0, G_MAXINT, 1,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_SCREEN_HEIGHT,
g_param_spec_int ("screen-height",
"Screen Height",
"Screen height, in pixels",
0, G_MAXINT, 1,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_STAGE,
g_param_spec_object ("stage",
"Stage",
"Stage holding the desktop scene graph",
CLUTTER_TYPE_ACTOR,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_WINDOW_GROUP,
g_param_spec_object ("window-group",
"Window Group",
"Actor holding window actors",
CLUTTER_TYPE_ACTOR,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_WINDOW_MANAGER,
g_param_spec_object ("window-manager",
"Window Manager",
"Window management interface",
SHELL_TYPE_WM,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_IMAGEDIR,
g_param_spec_string ("imagedir",
"Image directory",
"Directory containing gnome-shell image files",
NULL,
G_PARAM_READABLE));
}
/**
* search_path_init:
*
* search_path_init and get_applications_search_path below were copied from glib/gio/gdesktopappinfo.c
* copyright Red Hat, Inc., written by Alex Larsson, licensed under the LGPL
*
* Return value: location of an array with user and system application directories.
*/
static gpointer
search_path_init (gpointer data)
{
char **args = NULL;
const char * const *data_dirs;
const char *user_data_dir;
int i, length, j;
data_dirs = g_get_system_data_dirs ();
length = g_strv_length ((char **)data_dirs);
args = g_new (char *, length + 2);
j = 0;
user_data_dir = g_get_user_data_dir ();
args[j++] = g_build_filename (user_data_dir, "applications", NULL);
for (i = 0; i < length; i++)
args[j++] = g_build_filename (data_dirs[i],
"applications", NULL);
args[j++] = NULL;
return args;
}
/**
* get_applications_search_path:
*
* Return value: location of an array with user and system application directories.
*/
static const char * const *
get_applications_search_path (void)
{
static GOnce once_init = G_ONCE_INIT;
return g_once (&once_init, search_path_init, NULL);
}
/**
* shell_clutter_texture_set_from_pixbuf:
* texture: #ClutterTexture to be modified
* pixbuf: #GdkPixbuf to set as an image for #ClutterTexture
*
* Convenience function for setting an image for #ClutterTexture based on #GdkPixbuf.
* Copied from an example posted by hp in this thread http://mail.gnome.org/archives/gtk-devel-list/2008-September/msg00218.html
*
* Return value: %TRUE on success, %FALSE on failure
*/
gboolean
shell_clutter_texture_set_from_pixbuf (ClutterTexture *texture,
GdkPixbuf *pixbuf)
{
return clutter_texture_set_from_rgb_data (texture,
gdk_pixbuf_get_pixels (pixbuf),
gdk_pixbuf_get_has_alpha (pixbuf),
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
gdk_pixbuf_get_rowstride (pixbuf),
gdk_pixbuf_get_has_alpha (pixbuf)
? 4 : 3,
0, NULL);
}
static GnomeThumbnailFactory *thumbnail_factory;
/**
* shell_get_thumbnail_for_recent_info:
*
* @recent_info: #GtkRecentInfo for which to return a thumbnail
*
* Return value: #GdkPixbuf containing a thumbnail for the file described by #GtkRecentInfo
* if the thumbnail exists or can be generated, %NULL otherwise
*/
GdkPixbuf *
shell_get_thumbnail_for_recent_info(GtkRecentInfo *recent_info)
{
char *existing_thumbnail;
GdkPixbuf *pixbuf = NULL;
const gchar *uri = gtk_recent_info_get_uri (recent_info);
time_t mtime = gtk_recent_info_get_modified (recent_info);
const gchar *mime_type = gtk_recent_info_get_mime_type (recent_info);
GError *error = NULL;
if (thumbnail_factory == NULL)
thumbnail_factory = gnome_thumbnail_factory_new (GNOME_THUMBNAIL_SIZE_NORMAL);
existing_thumbnail = gnome_thumbnail_factory_lookup (thumbnail_factory, uri, mtime);
if (existing_thumbnail != NULL)
{
pixbuf = gdk_pixbuf_new_from_file(existing_thumbnail, &error);
if (error != NULL)
{
g_warning("Could not generate a pixbuf from file %s: %s", existing_thumbnail, error->message);
g_clear_error (&error);
}
}
else if (gnome_thumbnail_factory_can_thumbnail (thumbnail_factory, uri, mime_type, mtime))
{
pixbuf = gnome_thumbnail_factory_generate_thumbnail (thumbnail_factory, uri, mime_type);
if (pixbuf == NULL)
{
g_warning ("Could not generate thumbnail for %s", uri);
}
else
{
// we need to save the thumbnail so that we don't need to generate it again in the future
gnome_thumbnail_factory_save_thumbnail (thumbnail_factory, pixbuf, uri, mtime);
}
}
return pixbuf;
}
/**
* shell_get_categories_for_desktop_file:
*
* @desktop_file_name: name of the desktop file for which to retrieve categories
*
* Return value: (element-type char*) (transfer full): List of categories
*
*/
GSList *
shell_get_categories_for_desktop_file(const char *desktop_file_name)
{
GKeyFile *key_file;
const char * const *search_dirs;
char **categories = NULL;
GSList *categories_list = NULL;
char *full_path = NULL;
GError *error = NULL;
gsize len;
int i;
key_file = g_key_file_new ();
search_dirs = get_applications_search_path();
g_key_file_load_from_dirs (key_file, desktop_file_name, (const char **)search_dirs, &full_path, 0, &error);
if (error != NULL)
{
g_warning ("Error when loading a key file for %s: %s", desktop_file_name, error->message);
g_clear_error (&error);
}
else
{
categories = g_key_file_get_string_list (key_file,
"Desktop Entry",
"Categories",
&len,
&error);
if (error != NULL)
{
// "Categories" is not a required key in the desktop files, so it's ok if we didn't find it
g_clear_error (&error);
}
}
g_key_file_free (key_file);
if (categories == NULL)
return NULL;
// gjs currently does not support returning arrays (other than a NULL value for an array), so we need
// to convert the array we are returning to GSList, returning which gjs supports.
// See http://bugzilla.gnome.org/show_bug.cgi?id=560567 for more info on gjs array support.
for (i = 0; categories[i]; i++)
{
categories_list = g_slist_prepend (categories_list, g_strdup (categories[i]));
}
g_strfreev (categories);
return categories_list;
}
/**
* shell_get_event_key_symbol:
*
* Return value: Clutter key value for the key press and release events,
* as specified in clutter-keysyms.h
*/
guint16
shell_get_event_key_symbol(ClutterEvent *event)
{
g_return_val_if_fail(event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE, 0);
return event->key.keyval;
}
/**
* shell_get_button_event_click_count:
*
* Return value: click count for button press and release events
*/
guint16
shell_get_button_event_click_count(ClutterEvent *event)
{
g_return_val_if_fail(event->type == CLUTTER_BUTTON_PRESS ||
event->type == CLUTTER_BUTTON_RELEASE, 0);
return event->button.click_count;
}
/**
* shell_global_get:
*
* Gets the singleton global object that represents the desktop.
*
* Return value: (transfer none): the singleton global object
*/
ShellGlobal *
shell_global_get (void)
{
static ShellGlobal *the_object = NULL;
if (!the_object)
the_object = g_object_new (SHELL_TYPE_GLOBAL, 0);
return the_object;
}
/**
* shell_global_set_stage_input_area:
* x: X coordinate of rectangle
* y: Y coordinate of rectangle
* width: width of rectangle
* height: height of rectangle
*
* Sets the area of the stage that is responsive to mouse clicks as
* a rectangle.
*/
void
shell_global_set_stage_input_area (ShellGlobal *global,
int x,
int y,
int width,
int height)
{
g_return_if_fail (SHELL_IS_GLOBAL (global));
/* Cache these so we can save/restore across grabs */
global->input_x = x;
global->input_y = y;
global->input_width = width;
global->input_height = height;
/* If we have a grab active, we'll set the input area when we ungrab. */
if (!global->grab_active)
mutter_plugin_set_stage_input_area (global->plugin, x, y, width, height);
}
/**
* shell_global_get_windows:
*
* Gets the list of MutterWindows for the plugin's screen
*
* Return value: (element-type MutterWindow) (transfer none): the list of windows
*/
GList *
shell_global_get_windows (ShellGlobal *global)
{
g_return_val_if_fail (SHELL_IS_GLOBAL (global), NULL);
return mutter_plugin_get_windows (global->plugin);
}
void
_shell_global_set_plugin (ShellGlobal *global,
MutterPlugin *plugin)
{
g_return_if_fail (SHELL_IS_GLOBAL (global));
g_return_if_fail (global->plugin == NULL);
global->plugin = plugin;
global->wm = shell_wm_new (plugin);
}
/**
* shell_global_grab_keyboard:
* @global: a #ShellGlobal
*
* Grab the keyboard to the stage window. The stage will receive
* all keyboard events until shell_global_ungrab_keyboard() is called.
* This is appropriate to do when the desktop goes into a special
* mode where no normal global key shortcuts or application keyboard
* processing should happen.
*/
gboolean
shell_global_grab_keyboard (ShellGlobal *global)
{
MetaScreen *screen = mutter_plugin_get_screen (global->plugin);
MetaDisplay *display = meta_screen_get_display (screen);
Display *xdisplay = meta_display_get_xdisplay (display);
ClutterStage *stage = CLUTTER_STAGE (mutter_plugin_get_stage (global->plugin));
Window stagewin = clutter_x11_get_stage_window (stage);
/* FIXME: we need to coordinate with the rest of Metacity or we
* may grab the keyboard away from other portions of Metacity
* and leave Metacity in a confused state. An X client is allowed
* to overgrab itself, though not allowed to grab they keyboard
* away from another applications.
*/
if (global->keyboard_grabbed)
return FALSE;
if (XGrabKeyboard (xdisplay, stagewin,
False, /* owner_events - steal events from the rest of metacity */
GrabModeAsync, GrabModeAsync,
CurrentTime) != Success)
return FALSE; /* probably AlreadyGrabbed, some other app has a keyboard grab */
global->keyboard_grabbed = TRUE;
return TRUE;
}
/**
* shell_global_ungrab_keyboard:
* @global: a #ShellGlobal
*
* Undoes the effect of shell_global_grab_keyboard
*/
void
shell_global_ungrab_keyboard (ShellGlobal *global)
{
MetaScreen *screen;
MetaDisplay *display;
Display *xdisplay;
g_return_if_fail (global->keyboard_grabbed);
screen = mutter_plugin_get_screen (global->plugin);
display = meta_screen_get_display (screen);
xdisplay = meta_display_get_xdisplay (display);
XUngrabKeyboard (xdisplay, CurrentTime);
global->keyboard_grabbed = FALSE;
}
/* Code to close all file descriptors before we exec; copied from gspawn.c in GLib.
*
* Authors: Padraig O'Briain, Matthias Clasen, Lennart Poettering
*
* http://bugzilla.gnome.org/show_bug.cgi?id=469231
* http://bugzilla.gnome.org/show_bug.cgi?id=357585
*/
static int
set_cloexec (void *data, gint fd)
{
if (fd >= GPOINTER_TO_INT (data))
fcntl (fd, F_SETFD, FD_CLOEXEC);
return 0;
}
#ifndef HAVE_FDWALK
static int
fdwalk (int (*cb)(void *data, int fd), void *data)
{
gint open_max;
gint fd;
gint res = 0;
#ifdef HAVE_SYS_RESOURCE_H
struct rlimit rl;
#endif
#ifdef __linux__
DIR *d;
if ((d = opendir("/proc/self/fd"))) {
struct dirent *de;
while ((de = readdir(d))) {
glong l;
gchar *e = NULL;
if (de->d_name[0] == '.')
continue;
errno = 0;
l = strtol(de->d_name, &e, 10);
if (errno != 0 || !e || *e)
continue;
fd = (gint) l;
if ((glong) fd != l)
continue;
if (fd == dirfd(d))
continue;
if ((res = cb (data, fd)) != 0)
break;
}
closedir(d);
return res;
}
/* If /proc is not mounted or not accessible we fall back to the old
* rlimit trick */
#endif
#ifdef HAVE_SYS_RESOURCE_H
if (getrlimit(RLIMIT_NOFILE, &rl) == 0 && rl.rlim_max != RLIM_INFINITY)
open_max = rl.rlim_max;
else
#endif
open_max = sysconf (_SC_OPEN_MAX);
for (fd = 0; fd < open_max; fd++)
if ((res = cb (data, fd)) != 0)
break;
return res;
}
#endif
static void
pre_exec_close_fds(void)
{
fdwalk (set_cloexec, GINT_TO_POINTER(3));
}
/**
* shell_global_reexec_self:
* @global: A #ShellGlobal
*
* Restart the current process. Only intended for development purposes.
*/
void
shell_global_reexec_self (ShellGlobal *global)
{
GPtrArray *arr;
gsize len;
char *buf;
char *buf_p;
char *buf_end;
GError *error = NULL;
/* Linux specific (I think, anyways). */
if (!g_file_get_contents ("/proc/self/cmdline", &buf, &len, &error))
{
g_warning ("failed to get /proc/self/cmdline: %s", error->message);
return;
}
buf_end = buf+len;
arr = g_ptr_array_new ();
/* The cmdline file is NUL-separated */
for (buf_p = buf; buf_p < buf_end; buf_p = buf_p + strlen (buf_p) + 1)
g_ptr_array_add (arr, buf_p);
g_ptr_array_add (arr, NULL);
/* Close all file descriptors other than stdin/stdout/stderr, otherwise
* they will leak and stay open after the exec. In particular, this is
* important for file descriptors that represent mapped graphics buffer
* objects.
*/
pre_exec_close_fds ();
execvp (arr->pdata[0], (char**)arr->pdata);
g_warning ("failed to reexec: %s", g_strerror (errno));
g_ptr_array_free (arr, TRUE);
}
void
shell_global_grab_dbus_service (ShellGlobal *global)
{
GError *error = NULL;
DBusGConnection *session;
DBusGProxy *bus;
guint32 request_name_result;
session = dbus_g_bus_get (DBUS_BUS_SESSION, NULL);
bus = dbus_g_proxy_new_for_name (session,
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS);
if (!dbus_g_proxy_call (bus, "RequestName", &error,
G_TYPE_STRING, SHELL_DBUS_SERVICE,
G_TYPE_UINT, 0,
G_TYPE_INVALID,
G_TYPE_UINT, &request_name_result,
G_TYPE_INVALID))
{
g_print ("failed to acquire org.gnome.Shell: %s\n", error->message);
/* If we somehow got started again, it's not an error to be running
* already. So just exit 0.
*/
exit (0);
}
g_object_unref (bus);
}
void
shell_global_start_task_panel (ShellGlobal *global)
{
const char* panel_args[] = {"gnomeshell-taskpanel", SHELL_DBUS_SERVICE, NULL};
GError *error = NULL;
if (!g_spawn_async (NULL, (char**)panel_args, NULL, G_SPAWN_SEARCH_PATH, NULL,
NULL, NULL, &error))
{
g_critical ("failed to execute %s: %s", panel_args[0], error->message);
g_clear_error (&error);
}
}
static void
grab_notify (GtkWidget *widget, gboolean was_grabbed, gpointer user_data)
{
ShellGlobal *global = SHELL_GLOBAL (user_data);
if (!was_grabbed)
{
mutter_plugin_set_stage_input_area (global->plugin, 0, 0, 0, 0);
}
else
{
mutter_plugin_set_stage_input_area (global->plugin, global->input_x, global->input_y,
global->input_width, global->input_height);
}
}
/**
* shell_global_create_vertical_gradient:
* @top: the color at the top
* @bottom: the color at the bottom
*
* Creates a vertical gradient actor.
*
* Return value: (transfer none): a #ClutterCairoTexture actor with the
* gradient. The texture actor is floating, hence (transfer none).
*/
ClutterCairoTexture *
shell_global_create_vertical_gradient (ClutterColor *top,
ClutterColor *bottom)
{
ClutterCairoTexture *texture;
cairo_t *cr;
cairo_pattern_t *pattern;
/* Draw the gradient on an 8x8 pixel texture. Because the gradient is drawn
* from the uppermost to the lowermost row, after stretching 1/16 of the
* texture height has the top color and 1/16 has the bottom color. The 8
* pixel width is chosen for reasons related to graphics hardware internals.
*/
texture = CLUTTER_CAIRO_TEXTURE (clutter_cairo_texture_new (8, 8));
cr = clutter_cairo_texture_create (texture);
pattern = cairo_pattern_create_linear (0, 0, 0, 8);
cairo_pattern_add_color_stop_rgba (pattern, 0,
top->red / 255.,
top->green / 255.,
top->blue / 255.,
top->alpha / 255.);
cairo_pattern_add_color_stop_rgba (pattern, 1,
bottom->red / 255.,
bottom->green / 255.,
bottom->blue / 255.,
bottom->alpha / 255.);
cairo_set_source (cr, pattern);
cairo_paint (cr);
cairo_pattern_destroy (pattern);
cairo_destroy (cr);
return texture;
}
/*
* Updates the global->root_pixmap actor with the root window's pixmap or fails
* with a warning.
*/
static void
update_root_window_pixmap (ShellGlobal *global)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
guchar *data;
if (!XGetWindowProperty (gdk_x11_get_default_xdisplay (),
gdk_x11_get_default_root_xwindow (),
gdk_x11_get_xatom_by_name ("_XROOTPMAP_ID"),
0, LONG_MAX,
False,
AnyPropertyType,
&type, &format, &nitems, &bytes_after, &data) &&
type != None)
{
/* Got a property. */
if (type == XA_PIXMAP && format == 32 && nitems == 1)
{
/* Was what we expected. */
clutter_x11_texture_pixmap_set_pixmap (CLUTTER_X11_TEXTURE_PIXMAP (global->root_pixmap),
*(Pixmap *)data);
}
else
{
g_warning ("Could not get the root window pixmap");
}
XFree(data);
}
}
/*
* Called when the X server emits a root window change event. If the event is
* about a new pixmap, update the global->root_pixmap actor.
*/
static GdkFilterReturn
root_window_filter (GdkXEvent *native, GdkEvent *event, gpointer data)
{
XEvent *xevent = (XEvent *)native;
if ((xevent->type == PropertyNotify) &&
(xevent->xproperty.window == gdk_x11_get_default_root_xwindow ()) &&
(xevent->xproperty.atom == gdk_x11_get_xatom_by_name ("_XROOTPMAP_ID")))
update_root_window_pixmap (SHELL_GLOBAL (data));
return GDK_FILTER_CONTINUE;
}
/*
* Called when the root window pixmap actor is destroyed.
*/
static void
root_pixmap_destroy (GObject *sender, gpointer data)
{
ShellGlobal *global = SHELL_GLOBAL (data);
gdk_window_remove_filter (gdk_get_default_root_window (),
root_window_filter, global);
global->root_pixmap = NULL;
}
/**
* shell_global_create_root_pixmap_actor:
* @global: a #ShellGlobal
*
* Creates an actor showing the root window pixmap.
*
* Return value: (transfer none): a #ClutterActor with the root window pixmap.
* The actor is floating, hence (transfer none).
*/
ClutterActor *
shell_global_create_root_pixmap_actor (ShellGlobal *global)
{
GdkWindow *window;
GdkEventMask events;
gboolean created_new_pixmap = FALSE;
ClutterActor *clone;
/* The actor created is actually a ClutterClone of global->root_pixmap. */
if (global->root_pixmap == NULL)
{
global->root_pixmap = CLUTTER_GLX_TEXTURE_PIXMAP (clutter_glx_texture_pixmap_new ());
/* The low and medium quality filters give nearest-neighbor resizing. */
clutter_texture_set_filter_quality (CLUTTER_TEXTURE (global->root_pixmap),
CLUTTER_TEXTURE_QUALITY_HIGH);
/* The pixmap actor is only referenced by its clones. */
g_object_ref_sink (global->root_pixmap);
g_signal_connect (G_OBJECT (global->root_pixmap), "destroy",
G_CALLBACK (root_pixmap_destroy), global);
/* Watch the root window for changes. */
window = gdk_get_default_root_window ();
events = gdk_window_get_events (window);
events |= GDK_PROPERTY_CHANGE_MASK;
gdk_window_set_events (window, events);
/* Metacity handles some root window property updates in its global
* event filter, though not this one. For all root window property
* updates, the global filter returns GDK_FILTER_CONTINUE, so our
* window specific filter will be called.
*/
gdk_window_add_filter (window, root_window_filter, global);
update_root_window_pixmap (global);
created_new_pixmap = TRUE;
}
clone = clutter_clone_new (CLUTTER_ACTOR (global->root_pixmap));
if (created_new_pixmap)
g_object_unref(global->root_pixmap);
return clone;
}
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