/* Clutter. * An OpenGL based 'interactive canvas' library. * Authored By Matthew Allum * Copyright (C) 2006-2007 OpenedHand * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library. If not, see . * * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include #include #include #include "clutter-backend-x11.h" #include "clutter-device-manager-x11.h" #include "clutter-input-device-x11.h" #include "clutter-settings-x11.h" #include "clutter-stage-x11.h" #include "clutter-x11.h" #include "xsettings/xsettings-common.h" #include #ifdef HAVE_XINPUT #include #endif #include "cogl/cogl.h" #include "cogl/cogl-internal.h" #include "clutter-backend.h" #include "clutter-debug.h" #include "clutter-device-manager.h" #include "clutter-event.h" #include "clutter-main.h" #include "clutter-private.h" G_DEFINE_TYPE (ClutterBackendX11, clutter_backend_x11, CLUTTER_TYPE_BACKEND); /* atoms; remember to add the code that assigns the atom value to * the member of the ClutterBackendX11 structure if you add an * atom name here. do not change the order! */ static const gchar *atom_names[] = { "_NET_WM_PID", "_NET_WM_PING", "_NET_WM_STATE", "_NET_WM_STATE_FULLSCREEN", "_NET_WM_USER_TIME", "WM_PROTOCOLS", "WM_DELETE_WINDOW", "_XEMBED", "_XEMBED_INFO", "_NET_WM_NAME", "UTF8_STRING", }; static const guint n_atom_names = G_N_ELEMENTS (atom_names); /* singleton object */ static ClutterBackendX11 *backend_singleton = NULL; /* various flags corresponding to pre init setup calls */ static gboolean _no_xevent_retrieval = FALSE; static gboolean clutter_enable_xinput = FALSE; static gboolean clutter_enable_argb = FALSE; static Display *_foreign_dpy = NULL; /* options */ static gchar *clutter_display_name = NULL; static gint clutter_screen = -1; static gboolean clutter_synchronise = FALSE; /* X error trap */ static int TrappedErrorCode = 0; static int (* old_error_handler) (Display *, XErrorEvent *); static ClutterX11FilterReturn xsettings_filter (XEvent *xevent, ClutterEvent *event, gpointer data) { ClutterBackendX11 *backend_x11 = data; _clutter_xsettings_client_process_event (backend_x11->xsettings, xevent); /* we always want the rest of the stack to get XSettings events, even * if Clutter already handled them */ return CLUTTER_X11_FILTER_CONTINUE; } static Bool clutter_backend_x11_xsettings_watch (Window window, Bool is_start, long mask, void *cb_data) { ClutterBackendX11 *backend_x11 = cb_data; if (is_start) { backend_x11->xsettings_xwin = window; if (!backend_x11->xsettings_xwin) return False; clutter_x11_add_filter (xsettings_filter, backend_x11); CLUTTER_NOTE (BACKEND, "Added filter on XSettings manager window 0x%x", (unsigned int) backend_x11->xsettings_xwin); } else { CLUTTER_NOTE (BACKEND, "Removed filter on XSettings manager window 0x%x", (unsigned int) backend_x11->xsettings_xwin); clutter_x11_remove_filter (xsettings_filter, backend_x11); backend_x11->xsettings_xwin = None; } return True; } static void clutter_backend_x11_xsettings_notify (const char *name, XSettingsAction action, XSettingsSetting *setting, void *cb_data) { ClutterSettings *settings = clutter_settings_get_default (); gint i; if (name == NULL || *name == '\0') return; g_object_freeze_notify (G_OBJECT (settings)); for (i = 0; i < _n_clutter_settings_map; i++) { if (g_strcmp0 (name, CLUTTER_SETTING_X11_NAME (i)) == 0) { GValue value = { 0, }; switch (setting->type) { case XSETTINGS_TYPE_INT: g_value_init (&value, G_TYPE_INT); g_value_set_int (&value, setting->data.v_int); break; case XSETTINGS_TYPE_STRING: g_value_init (&value, G_TYPE_STRING); g_value_set_string (&value, setting->data.v_string); break; case XSETTINGS_TYPE_COLOR: { ClutterColor color; color.red = (guint8) ((float) setting->data.v_color.red / 65535.0 * 255); color.green = (guint8) ((float) setting->data.v_color.green / 65535.0 * 255); color.blue = (guint8) ((float) setting->data.v_color.blue / 65535.0 * 255); color.alpha = (guint8) ((float) setting->data.v_color.alpha / 65535.0 * 255); g_value_init (&value, G_TYPE_BOXED); clutter_value_set_color (&value, &color); } break; } CLUTTER_NOTE (BACKEND, "Mapping XSETTING '%s' to 'ClutterSettings:%s'", CLUTTER_SETTING_X11_NAME (i), CLUTTER_SETTING_PROPERTY (i)); g_object_set_property (G_OBJECT (settings), CLUTTER_SETTING_PROPERTY (i), &value); g_value_unset (&value); break; } } g_object_thaw_notify (G_OBJECT (settings)); } gboolean clutter_backend_x11_pre_parse (ClutterBackend *backend, GError **error) { const gchar *env_string; /* we don't fail here if DISPLAY is not set, as the user * might pass the --display command line switch */ env_string = g_getenv ("DISPLAY"); if (env_string) { clutter_display_name = g_strdup (env_string); env_string = NULL; } env_string = g_getenv ("CLUTTER_DISABLE_ARGB_VISUAL"); if (env_string) { clutter_enable_argb = FALSE; env_string = NULL; } return TRUE; } gboolean clutter_backend_x11_post_parse (ClutterBackend *backend, GError **error) { ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend); if (_foreign_dpy) backend_x11->xdpy = _foreign_dpy; /* * Only open connection if not already set by prior call to * clutter_x11_set_display() */ if (!backend_x11->xdpy) { if (clutter_display_name) { CLUTTER_NOTE (BACKEND, "XOpenDisplay on '%s'", clutter_display_name); backend_x11->xdpy = XOpenDisplay (clutter_display_name); if (backend_x11->xdpy == NULL) { g_set_error (error, CLUTTER_INIT_ERROR, CLUTTER_INIT_ERROR_BACKEND, "Unable to open display '%s'", clutter_display_name); return FALSE; } } else { g_set_error (error, CLUTTER_INIT_ERROR, CLUTTER_INIT_ERROR_BACKEND, "Unable to open display. You have to set the DISPLAY " "environment variable, or use the --display command " "line argument"); return FALSE; } } if (backend_x11->xdpy) { ClutterSettings *settings; Atom atoms[n_atom_names]; double dpi; CLUTTER_NOTE (BACKEND, "Getting the X screen"); settings = clutter_settings_get_default (); /* Cogl needs to know the Xlib display connection for CoglTexturePixmapX11 */ _cogl_xlib_set_display (backend_x11->xdpy); if (clutter_screen == -1) backend_x11->xscreen = DefaultScreenOfDisplay (backend_x11->xdpy); else backend_x11->xscreen = ScreenOfDisplay (backend_x11->xdpy, clutter_screen); backend_x11->xscreen_num = XScreenNumberOfScreen (backend_x11->xscreen); backend_x11->xwin_root = RootWindow (backend_x11->xdpy, backend_x11->xscreen_num); backend_x11->display_name = g_strdup (clutter_display_name); dpi = (((double) DisplayHeight (backend_x11->xdpy, backend_x11->xscreen_num) * 25.4) / (double) DisplayHeightMM (backend_x11->xdpy, backend_x11->xscreen_num)); g_object_set (settings, "font-dpi", (int) dpi * 1024, NULL); /* register input devices */ backend_x11->device_manager = g_object_new (CLUTTER_TYPE_DEVICE_MANAGER_X11, "use-xinput-1", clutter_enable_xinput, "backend", backend_x11, NULL); /* register keymap */ backend_x11->keymap = g_object_new (CLUTTER_TYPE_KEYMAP_X11, "backend", backend_x11, NULL); /* create XSETTINGS client */ backend_x11->xsettings = _clutter_xsettings_client_new (backend_x11->xdpy, backend_x11->xscreen_num, clutter_backend_x11_xsettings_notify, clutter_backend_x11_xsettings_watch, backend_x11); if (clutter_synchronise) XSynchronize (backend_x11->xdpy, True); XInternAtoms (backend_x11->xdpy, (char **) atom_names, n_atom_names, False, atoms); backend_x11->atom_NET_WM_PID = atoms[0]; backend_x11->atom_NET_WM_PING = atoms[1]; backend_x11->atom_NET_WM_STATE = atoms[2]; backend_x11->atom_NET_WM_STATE_FULLSCREEN = atoms[3]; backend_x11->atom_NET_WM_USER_TIME = atoms[4]; backend_x11->atom_WM_PROTOCOLS = atoms[5]; backend_x11->atom_WM_DELETE_WINDOW = atoms[6]; backend_x11->atom_XEMBED = atoms[7]; backend_x11->atom_XEMBED_INFO = atoms[8]; backend_x11->atom_NET_WM_NAME = atoms[9]; backend_x11->atom_UTF8_STRING = atoms[10]; } g_free (clutter_display_name); CLUTTER_NOTE (BACKEND, "X Display '%s'[%p] opened (screen:%d, root:%u, dpi:%f)", backend_x11->display_name, backend_x11->xdpy, backend_x11->xscreen_num, (unsigned int) backend_x11->xwin_root, clutter_backend_get_resolution (backend)); return TRUE; } static void clutter_backend_x11_init_events (ClutterBackend *backend) { CLUTTER_NOTE (EVENT, "initialising the event loop"); if (!_no_xevent_retrieval) _clutter_backend_x11_events_init (backend); } static const GOptionEntry entries[] = { { "display", 0, G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_STRING, &clutter_display_name, N_("X display to use"), "DISPLAY" }, { "screen", 0, G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_INT, &clutter_screen, N_("X screen to use"), "SCREEN" }, { "synch", 0, 0, G_OPTION_ARG_NONE, &clutter_synchronise, N_("Make X calls synchronous"), NULL }, #ifdef HAVE_XINPUT { "enable-xinput", 0, 0, G_OPTION_ARG_NONE, &clutter_enable_xinput, N_("Enable XInput support"), NULL }, #endif /* HAVE_XINPUT */ { NULL } }; void clutter_backend_x11_add_options (ClutterBackend *backend, GOptionGroup *group) { g_option_group_add_entries (group, entries); } static void clutter_backend_x11_finalize (GObject *gobject) { ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (gobject); g_free (backend_x11->display_name); _clutter_xsettings_client_destroy (backend_x11->xsettings); XCloseDisplay (backend_x11->xdpy); if (backend_singleton) backend_singleton = NULL; G_OBJECT_CLASS (clutter_backend_x11_parent_class)->finalize (gobject); } static void clutter_backend_x11_dispose (GObject *gobject) { ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (gobject); ClutterStageManager *stage_manager; CLUTTER_NOTE (BACKEND, "Disposing the of stages"); stage_manager = clutter_stage_manager_get_default (); /* Destroy all of the stages. g_slist_foreach is used because the finalizer for the stages will remove the stage from the stage_manager's list and g_slist_foreach has some basic protection against this */ g_slist_foreach (stage_manager->stages, (GFunc) clutter_actor_destroy, NULL); CLUTTER_NOTE (BACKEND, "Removing the event source"); _clutter_backend_x11_events_uninit (CLUTTER_BACKEND (backend_x11)); G_OBJECT_CLASS (clutter_backend_x11_parent_class)->dispose (gobject); } static GObject * clutter_backend_x11_constructor (GType gtype, guint n_params, GObjectConstructParam *params) { GObjectClass *parent_class; GObject *retval; if (!backend_singleton) { parent_class = G_OBJECT_CLASS (clutter_backend_x11_parent_class); retval = parent_class->constructor (gtype, n_params, params); backend_singleton = CLUTTER_BACKEND_X11 (retval); return retval; } g_warning ("Attempting to create a new backend object. This should " "never happen, so we return the singleton instance."); return g_object_ref (backend_singleton); } ClutterFeatureFlags clutter_backend_x11_get_features (ClutterBackend *backend) { return CLUTTER_FEATURE_STAGE_USER_RESIZE | CLUTTER_FEATURE_STAGE_CURSOR; } static void clutter_backend_x11_copy_event_data (ClutterBackend *backend, const ClutterEvent *src, ClutterEvent *dest) { gpointer event_x11; event_x11 = _clutter_event_get_platform_data (src); if (event_x11 != NULL) _clutter_event_set_platform_data (dest, _clutter_event_x11_copy (event_x11)); } static void clutter_backend_x11_free_event_data (ClutterBackend *backend, ClutterEvent *event) { gpointer event_x11; event_x11 = _clutter_event_get_platform_data (event); if (event_x11 != NULL) _clutter_event_x11_free (event_x11); } gboolean clutter_backend_x11_handle_event (ClutterBackendX11 *backend_x11, XEvent *xevent) { return FALSE; } static ClutterDeviceManager * clutter_backend_x11_get_device_manager (ClutterBackend *backend) { ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend); if (G_UNLIKELY (backend_x11->device_manager == NULL)) { backend_x11->device_manager = g_object_new (CLUTTER_TYPE_DEVICE_MANAGER_X11, "use-xinput-1", clutter_enable_xinput, "backend", backend_x11, NULL); } return backend_x11->device_manager; } static void clutter_backend_x11_class_init (ClutterBackendX11Class *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass); ClutterBackendX11Class *backendx11_class = CLUTTER_BACKEND_X11_CLASS (klass); gobject_class->constructor = clutter_backend_x11_constructor; gobject_class->dispose = clutter_backend_x11_dispose; gobject_class->finalize = clutter_backend_x11_finalize; backend_class->pre_parse = clutter_backend_x11_pre_parse; backend_class->post_parse = clutter_backend_x11_post_parse; backend_class->init_events = clutter_backend_x11_init_events; backend_class->add_options = clutter_backend_x11_add_options; backend_class->get_features = clutter_backend_x11_get_features; backend_class->get_device_manager = clutter_backend_x11_get_device_manager; backend_class->copy_event_data = clutter_backend_x11_copy_event_data; backend_class->free_event_data = clutter_backend_x11_free_event_data; backendx11_class->handle_event = clutter_backend_x11_handle_event; } static void clutter_backend_x11_init (ClutterBackendX11 *backend_x11) { backend_x11->last_event_time = CurrentTime; } static int error_handler(Display *xdpy, XErrorEvent *error) { TrappedErrorCode = error->error_code; return 0; } /** * clutter_x11_trap_x_errors: * * Traps every X error until clutter_x11_untrap_x_errors() is called. * * Since: 0.6 */ void clutter_x11_trap_x_errors (void) { TrappedErrorCode = 0; old_error_handler = XSetErrorHandler (error_handler); } /** * clutter_x11_untrap_x_errors: * * Removes the X error trap and returns the current status. * * Return value: the trapped error code, or 0 for success * * Since: 0.4 */ gint clutter_x11_untrap_x_errors (void) { XSetErrorHandler (old_error_handler); return TrappedErrorCode; } /** * clutter_x11_get_default_display: * * Retrieves the pointer to the default display. * * Return value: the default display * * Since: 0.6 */ Display * clutter_x11_get_default_display (void) { if (!backend_singleton) { g_critical ("X11 backend has not been initialised"); return NULL; } return backend_singleton->xdpy; } /** * clutter_x11_set_display: * @xdpy: pointer to a X display connection. * * Sets the display connection Clutter should use; must be called * before clutter_init(), clutter_init_with_args() or other functions * pertaining Clutter's initialization process. * * If you are parsing the command line arguments by retrieving Clutter's * #GOptionGroup with clutter_get_option_group() and calling * g_option_context_parse() yourself, you should also call * clutter_x11_set_display() before g_option_context_parse(). * * Since: 0.8 */ void clutter_x11_set_display (Display *xdpy) { if (_clutter_context_is_initialized ()) { g_critical ("Display connection already exists. You can only call " "clutter_x11_set_display() before clutter_init()"); return; } _foreign_dpy= xdpy; } /** * clutter_x11_enable_xinput: * * Enables the use of the XInput extension if present on connected * XServer and support built into Clutter. XInput allows for multiple * pointing devices to be used. * * This function must be called before clutter_init(). * * Since XInput might not be supported by the X server, you might * want to use clutter_x11_has_xinput() to see if support was enabled. * * Since: 0.8 */ void clutter_x11_enable_xinput (void) { if (_clutter_context_is_initialized ()) { g_critical ("clutter_x11_enable_xinput() can only be called " "before clutter_init()"); return; } clutter_enable_xinput = TRUE; } /** * clutter_x11_disable_event_retrieval: * * Disables the internal polling of X11 events in the main loop. * * Libraries or applications calling this function will be responsible of * polling all X11 events. * * You also must call clutter_x11_handle_event() to let Clutter process * events and maintain its internal state. * * This function can only be called before calling * clutter_init(). * * Even with event handling disabled, Clutter will still select * all the events required to maintain its internal state on the stage * Window; compositors using Clutter and input regions to pass events * through to application windows should not rely on an empty input * region, and should instead clear it themselves explicitly using the * XFixes extension. * * This function should not be normally used by applications. * * Since: 0.8 */ void clutter_x11_disable_event_retrieval (void) { if (_clutter_context_is_initialized ()) { g_warning ("clutter_x11_disable_event_retrieval() can only be " "called before clutter_init()"); return; } _no_xevent_retrieval = TRUE; } /** * clutter_x11_has_event_retrieval: * * Queries the X11 backend to check if event collection has been disabled. * * Return value: TRUE if event retrival has been disabled. FALSE otherwise. * * Since: 0.8 */ gboolean clutter_x11_has_event_retrieval (void) { return !_no_xevent_retrieval; } /** * clutter_x11_get_default_screen: * * Gets the number of the default X Screen object. * * Return value: the number of the default screen * * Since: 0.6 */ int clutter_x11_get_default_screen (void) { if (!backend_singleton) { g_critical ("X11 backend has not been initialised"); return 0; } return backend_singleton->xscreen_num; } /** * clutter_x11_get_root_window: * * Retrieves the root window. * * Return value: the id of the root window * * Since: 0.6 */ Window clutter_x11_get_root_window (void) { if (!backend_singleton) { g_critical ("X11 backend has not been initialised"); return None; } return backend_singleton->xwin_root; } /** * clutter_x11_add_filter: * @func: a filter function * @data: user data to be passed to the filter function, or %NULL * * Adds an event filter function. * * Since: 0.6 */ void clutter_x11_add_filter (ClutterX11FilterFunc func, gpointer data) { ClutterX11EventFilter *filter; g_return_if_fail (func != NULL); if (!backend_singleton) { g_critical ("X11 backend has not been initialised"); return; } filter = g_new0 (ClutterX11EventFilter, 1); filter->func = func; filter->data = data; backend_singleton->event_filters = g_slist_append (backend_singleton->event_filters, filter); return; } /** * clutter_x11_remove_filter: * @func: a filter function * @data: user data to be passed to the filter function, or %NULL * * Removes the given filter function. * * Since: 0.6 */ void clutter_x11_remove_filter (ClutterX11FilterFunc func, gpointer data) { GSList *tmp_list, *this; ClutterX11EventFilter *filter; g_return_if_fail (func != NULL); tmp_list = backend_singleton->event_filters; while (tmp_list) { filter = tmp_list->data; this = tmp_list; tmp_list = tmp_list->next; if (filter->func == func && filter->data == data) { backend_singleton->event_filters = g_slist_remove_link (backend_singleton->event_filters, this); g_slist_free_1 (this); g_free (filter); return; } } } void _clutter_x11_select_events (Window xwin) { #ifdef HAVE_XINPUT ClutterDeviceManager *manager; const GSList *l; if (G_UNLIKELY (backend_singleton == NULL)) { g_critical ("X11 backend has not been initialised"); return; } manager = clutter_device_manager_get_default (); for (l = clutter_device_manager_peek_devices (manager); l != NULL; l = l->next) { ClutterInputDevice *device = l->data; _clutter_input_device_x11_select_events (device, backend_singleton, xwin); } #endif /* HAVE_XINPUT */ } ClutterInputDevice * _clutter_x11_get_device_for_xid (XID id) { ClutterDeviceManager *manager; manager = clutter_device_manager_get_default (); return clutter_device_manager_get_device (manager, (gint) id); } /** * clutter_x11_get_input_devices: * * Retrieves a pointer to the list of input devices * * Deprecated: 1.2: Use clutter_device_manager_peek_devices() instead * * Since: 0.8 * * Return value: a pointer to the internal list of input devices; the * returned list is owned by Clutter and should not be modified or * freed */ G_CONST_RETURN GSList * clutter_x11_get_input_devices (void) { ClutterDeviceManager *manager; manager = clutter_device_manager_get_default (); return clutter_device_manager_peek_devices (manager); } /** * clutter_x11_has_xinput: * * Gets whether Clutter has XInput support. * * Return value: %TRUE if Clutter was compiled with XInput support * and XInput support is available at run time. * * Since: 0.8 */ gboolean clutter_x11_has_xinput (void) { #ifdef HAVE_XINPUT if (backend_singleton == NULL) { g_critical ("X11 backend has not been initialised"); return FALSE; } return backend_singleton->have_xinput; #else return FALSE; #endif } /** * clutter_x11_has_composite_extension: * * Retrieves whether Clutter is running on an X11 server with the * XComposite extension * * Return value: %TRUE if the XComposite extension is available */ gboolean clutter_x11_has_composite_extension (void) { static gboolean have_composite = FALSE, done_check = FALSE; int error = 0, event = 0; Display *dpy; if (done_check) return have_composite; if (!backend_singleton) { g_critical ("X11 backend has not been initialised"); return FALSE; } dpy = clutter_x11_get_default_display(); if (XCompositeQueryExtension (dpy, &event, &error)) { int major = 0, minor = 0; if (XCompositeQueryVersion (dpy, &major, &minor)) { if (major >= 0 && minor >= 3) have_composite = TRUE; } } done_check = TRUE; return have_composite; } /** * clutter_x11_set_use_argb_visual: * @use_argb: %TRUE if ARGB visuals should be requested by default * * Sets whether the Clutter X11 backend should request ARGB visuals by default * or not. * * By default, Clutter requests RGB visuals. * * If no ARGB visuals are found, the X11 backend will fall back to * requesting a RGB visual instead. * * ARGB visuals are required for the #ClutterStage:use-alpha property to work. * * This function can only be called once, and before clutter_init() is * called. * * Since: 1.2 */ void clutter_x11_set_use_argb_visual (gboolean use_argb) { if (backend_singleton != NULL) { g_warning ("%s() can only be used before calling clutter_init()", G_STRFUNC); return; } CLUTTER_NOTE (BACKEND, "ARGB visuals are %s", use_argb ? "enabled" : "disabled"); clutter_enable_argb = use_argb; } /** * clutter_x11_get_use_argb_visual: * * Retrieves whether the Clutter X11 backend is using ARGB visuals by default * * Return value: %TRUE if ARGB visuals are queried by default * * Since: 1.2 */ gboolean clutter_x11_get_use_argb_visual (void) { return clutter_enable_argb; } XVisualInfo * clutter_backend_x11_get_visual_info (ClutterBackendX11 *backend_x11) { ClutterBackendX11Class *klass; g_return_val_if_fail (CLUTTER_IS_BACKEND_X11 (backend_x11), NULL); klass = CLUTTER_BACKEND_X11_GET_CLASS (backend_x11); if (klass->get_visual_info) return klass->get_visual_info (backend_x11); return NULL; } /** * clutter_x11_get_visual_info: * * Retrieves the XVisualInfo used by the Clutter X11 * backend. * * Return value: a XVisualInfo, or * None. The returned value should be freed using XFree() * when done * * Since: 1.2 */ XVisualInfo * clutter_x11_get_visual_info (void) { ClutterBackendX11 *backend_x11; backend_x11 = CLUTTER_BACKEND_X11 (clutter_get_default_backend ()); return clutter_backend_x11_get_visual_info (backend_x11); }