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mutter/clutter/x11/clutter-backend-x11.c
Emmanuele Bassi fa54b7c60d docs: Further clarifications 
Mention the XFixes extension for compositors using input regions to let
events "pass through" the stage.

Thanks to: Robert Bragg <robert@linux.intel.com>
2010-08-03 16:48:53 +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, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib/gi18n-lib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#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 <X11/extensions/Xcomposite.h>
#ifdef HAVE_XINPUT
#include <X11/extensions/XInput.h>
#endif
#include "cogl/cogl.h"
#include "cogl/cogl-internal.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)
{
Atom atoms[n_atom_names];
double dpi;
CLUTTER_NOTE (BACKEND, "Getting the X screen");
/* 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));
clutter_backend_set_resolution (backend, dpi);
/* 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,
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.
*
* <warning>This function can only be called before calling
* clutter_init().</warning>
*
* <note>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.</note>
*
* 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.
*
* <note>If no ARGB visuals are found, the X11 backend will fall back to
* requesting a RGB visual instead.</note>
*
* ARGB visuals are required for the #ClutterStage:use-alpha property to work.
*
* <note>This function can only be called once, and before clutter_init() is
* called.</note>
*
* 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 <structname>XVisualInfo</structname> used by the Clutter X11
* backend.
*
* Return value: a <structname>XVisualInfo</structname>, or
* <varname>None</varname>. 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);
}
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