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15d7a86621
mutter/clutter/x11/clutter-backend-x11.c
Robert Bragg 15d7a86621 [backends] Remove the idea of offscreen stages from all backends 
The only backend that tried to implement offscreen stages was the GLX backend
and even this has apparently be broken for some time without anyone noticing.

The property still remains and since the property already clearly states that
it may not work I don't expect anyone to notice.

This simplifies quite a bit of the GLX code which is very desireable from the
POV that we want to start migrating window system code down to Cogl and the
simpler the code is the more straight forward this work will be.

In the future when Cogl has a nicely designed API for framebuffer objects then
re-implementing offscreen stages cleanly for *all* backends should be quite
straightforward.
2009-10-16 18:58:47 +01:00

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/* Clutter.
* An OpenGL based 'interactive canvas' library.
* Authored By Matthew Allum <mallum@openedhand.com>
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib/gi18n-lib.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include "clutter-backend-x11.h"
#include "clutter-stage-x11.h"
#include "clutter-x11.h"
#include <X11/extensions/Xcomposite.h>
#ifdef HAVE_XINPUT
#include <X11/extensions/XInput.h>
#endif
#include "../clutter-event.h"
#include "../clutter-main.h"
#include "../clutter-debug.h"
#include "../clutter-private.h"
#include "cogl/cogl.h"
G_DEFINE_TYPE (ClutterBackendX11, clutter_backend_x11, CLUTTER_TYPE_BACKEND);
struct _ClutterX11XInputDevice
{
ClutterInputDevice device;
#ifdef HAVE_XINPUT
XDevice *xdevice;
XEventClass xevent_list[5]; /* MAX 5 event types */
int num_events;
#endif
};
#ifdef HAVE_XINPUT
void _clutter_x11_register_xinput ();
#endif
/* 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 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 *);
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;
}
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 == None)
{
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)
{
Atom atoms[n_atom_names];
double dpi;
CLUTTER_NOTE (BACKEND, "Getting the X screen");
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));
clutter_backend_set_resolution (backend, dpi);
#ifdef HAVE_XINPUT
_clutter_x11_register_xinput ();
#endif
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);
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_class_init (ClutterBackendX11Class *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBackendClass *backend_class = CLUTTER_BACKEND_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;
}
static void
clutter_backend_x11_init (ClutterBackendX11 *backend_x11)
{
ClutterBackend *backend = CLUTTER_BACKEND (backend_x11);
/* FIXME: get from xsettings */
clutter_backend_set_double_click_time (backend, 250);
clutter_backend_set_double_click_distance (backend, 5);
clutter_backend_set_resolution (backend, 96.0);
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 must be called before
* clutter_init().
*
* You should 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 retrieval of X events in the main loop. Use to create event-less
* canvas or in conjunction with clutter_x11_handle_event.
*
* This function can only be called before calling clutter_init().
*
* 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_register_xinput ()
{
#ifdef HAVE_XINPUT
XDeviceInfo *xdevices = NULL;
XDeviceInfo *info = NULL;
XDevice *xdevice = NULL;
XInputClassInfo *xclass_info = NULL;
gint opcode, event, error;
gint res;
gint num_devices = 0;
gint num_events = 0;
gint i = 0, j = 0;
gboolean have_an_xpointer = FALSE;
ClutterBackendX11 *x11b;
ClutterX11XInputDevice *device = NULL;
ClutterMainContext *context;
GSList *input_devices = NULL;
if (!backend_singleton)
{
g_critical ("X11 backend has not been initialised");
return;
}
if (!clutter_enable_xinput)
{
CLUTTER_NOTE (BACKEND, "Not enabling XInput");
return;
}
context = _clutter_context_get_default ();
backend_singleton->have_xinput = FALSE;
/* is the XInput extension available? */
res = XQueryExtension (backend_singleton->xdpy, "XInputExtension",
&opcode, &event,
&error);
if (!res)
{
CLUTTER_NOTE (BACKEND, "X Input extension not available");
return;
}
x11b = backend_singleton;
xdevices = XListInputDevices (x11b->xdpy, &num_devices);
CLUTTER_NOTE (BACKEND, "%d XINPUT devices found", num_devices);
if (num_devices == 0)
return;
for (i = 0; i < num_devices; i++)
{
info = xdevices + i;
num_events = 0;
CLUTTER_NOTE (BACKEND, "Considering %li with type %d",
info->id,
info->use);
/* Only want 'raw' devices themselves not virtual ones */
if (info->use == IsXExtensionPointer ||
/*info->use == IsXExtensionKeyboard || XInput 1.x is broken */
info->use == IsXExtensionDevice)
{
clutter_x11_trap_x_errors ();
xdevice = XOpenDevice (backend_singleton->xdpy, info->id);
if (clutter_x11_untrap_x_errors () || xdevice == NULL)
continue;
/* Create the appropriate Clutter device */
device = g_slice_new0 (ClutterX11XInputDevice);
device->device.id = info->id;
switch (info->use)
{
case IsXExtensionPointer:
device->device.device_type = CLUTTER_POINTER_DEVICE;
have_an_xpointer = TRUE;
break;
#if 0
/* XInput 1.x is broken for keyboards: */
case IsXExtensionKeyboard:
device->device.type = CLUTTER_KEYBOARD_DEVICE;
break;
#endif
case IsXExtensionDevice:
device->device.device_type = CLUTTER_EXTENSION_DEVICE;
break;
}
/* FIXME: some kind of general device_init() call should do below */
device->device.click_count = 0;
device->device.previous_time = 0;
device->device.previous_x = -1;
device->device.previous_y = -1;
device->device.previous_button_number = -1;
device->num_events = 0;
device->xdevice = xdevice;
CLUTTER_NOTE (BACKEND, "Registering XINPUT device with XID: %li",
xdevice->device_id);
/* We must go through all the classes supported by this device and
* register the appropriate events we want. Each class only appears
* once. We need to store the types with the stage since they are
* created dynamically by the server. They are not device specific.
*/
for (j = 0; j < xdevice->num_classes; j++)
{
xclass_info = xdevice->classes + j;
switch (xclass_info->input_class)
{
#if 0
/* XInput 1.x is broken for keyboards: */
case KeyClass:
DeviceKeyPress (xdevice,
x11b->event_types[CLUTTER_X11_XINPUT_KEY_PRESS_EVENT],
device->xevent_list [num_events]);
num_events++;
DeviceKeyRelease (xdevice,
x11b->event_types[CLUTTER_X11_XINPUT_KEY_RELEASE_EVENT],
device->xevent_list [num_events]);
num_events++;
break;
#endif
case ButtonClass:
DeviceButtonPress (xdevice,
x11b->event_types[CLUTTER_X11_XINPUT_BUTTON_PRESS_EVENT],
device->xevent_list [num_events]);
num_events++;
DeviceButtonRelease (xdevice,
x11b->event_types[CLUTTER_X11_XINPUT_BUTTON_RELEASE_EVENT],
device->xevent_list [num_events]);
num_events++;
break;
case ValuatorClass:
DeviceMotionNotify (xdevice,
x11b->event_types[CLUTTER_X11_XINPUT_MOTION_NOTIFY_EVENT],
device->xevent_list [num_events]);
num_events++;
break;
}
}
if (info->use == IsXExtensionPointer && num_events > 0)
have_an_xpointer = TRUE;
device->num_events = num_events;
input_devices = g_slist_prepend (input_devices, device);
}
}
XFree (xdevices);
if (!have_an_xpointer)
{
GSList *l;
/* Something is likely wrong with Xinput setup so we basically
* abort here and fall back to lofi regular xinput.
*/
g_warning ("No usuable XInput pointing devices found");
for (l = input_devices; l != NULL; l = l->next)
g_slice_free (ClutterX11XInputDevice, l->data);
g_slist_free (input_devices);
context->input_devices = NULL;
return;
}
/* store the list of input devices */
context->input_devices = g_slist_reverse (input_devices);
/* why yes, we are awesome */
backend_singleton->have_xinput = TRUE;
#endif /* HAVE_XINPUT */
}
void
_clutter_x11_unregister_xinput ()
{
}
void
_clutter_x11_select_events (Window xwin)
{
#ifdef HAVE_XINPUT
GSList *list_it;
ClutterX11XInputDevice *device = NULL;
ClutterMainContext *context;
context = _clutter_context_get_default ();
if (!backend_singleton)
{
g_critical ("X11 backend has not been initialised");
return;
}
for (list_it = context->input_devices;
list_it != NULL;
list_it = list_it->next)
{
device = (ClutterX11XInputDevice *)list_it->data;
XSelectExtensionEvent (backend_singleton->xdpy,
xwin,
device->xevent_list,
device->num_events);
}
#endif /* HAVE_XINPUT */
}
ClutterInputDevice *
_clutter_x11_get_device_for_xid (XID id)
{
#ifdef HAVE_XINPUT
ClutterMainContext *context;
GSList *l;
context = _clutter_context_get_default ();
if (!backend_singleton)
{
g_critical ("X11 backend has not been initialised");
return NULL;
}
for (l = context->input_devices; l != NULL; l = l->next)
{
ClutterX11XInputDevice *device = l->data;
if (device->xdevice->device_id == id)
return (ClutterInputDevice *) device;
}
#endif /* HAVE_XINPUT */
return NULL;
}
/* FIXME: This nasty little func needs moving elsewhere.. */
G_CONST_RETURN GSList *
clutter_x11_get_input_devices (void)
{
#ifdef HAVE_XINPUT
ClutterMainContext *context;
if (!backend_singleton)
{
g_critical ("X11 backend has not been initialised");
return NULL;
}
context = _clutter_context_get_default ();
return context->input_devices;
#else /* !HAVE_XINPUT */
return NULL;
#endif /* HAVE_XINPUT */
}
/**
* 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)
{
g_critical ("X11 backend has not been initialised");
return FALSE;
}
return backend_singleton->have_xinput;
#else
return FALSE;
#endif
}
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;
}
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;
}
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