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mutter/clutter/x11/clutter-backend-x11.c
Emmanuele Bassi dd2f55c6f6 x11: Protect XComposite API calls 
Since we allow compiling Clutter without the XComposite extension
available, we need to protect the calls to the XComposite API with
the guards provided by the configure script.
2010-10-19 10:43:50 +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"
#if HAVE_XCOMPOSITE
#include <X11/extensions/Xcomposite.h>
#endif
#if HAVE_XINPUT
#include <X11/extensions/XInput.h>
#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.
*
* <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)
{
#if HAVE_XCOMPOSITE
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;
#else
return FALSE;
#endif /* HAVE_XCOMPOSITE */
}
/**
* 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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