gtk2/gdk/x11/gdkmain-x11.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * 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.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>

#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

#ifdef HAVE_XKB
#include <X11/XKBlib.h>
#endif

#include "gdk.h"

#include "gdkprivate-x11.h"
#include "gdkinternals.h"
#include "gdkregion-generic.h"
#include "gdkinputprivate.h"

#include <pango/pangox.h>

typedef struct _GdkPredicate  GdkPredicate;
typedef struct _GdkErrorTrap  GdkErrorTrap;

struct _GdkPredicate
{
  GdkEventFunc func;
  gpointer data;
};

struct _GdkErrorTrap
{
  int (*old_handler) (Display *, XErrorEvent *);
  gint error_warnings;
  gint error_code;
};

/* 
 * Private function declarations
 */

#ifndef HAVE_XCONVERTCASE
static void	 gdkx_XConvertCase	(KeySym	       symbol,
					 KeySym	      *lower,
					 KeySym	      *upper);
#define XConvertCase gdkx_XConvertCase
#endif

static int	    gdk_x_error			 (Display     *display, 
						  XErrorEvent *error);
static int	    gdk_x_io_error		 (Display     *display);

/* Private variable declarations
 */
static int gdk_initialized = 0;			    /* 1 if the library is initialized,
						     * 0 otherwise.
						     */

static gint autorepeat;
static gboolean gdk_synchronize = FALSE;
static GSList *gdk_error_traps = NULL;               /* List of error traps */
static GSList *gdk_error_trap_free_list = NULL;      /* Free list */

/* Information about current pointer and keyboard grabs held by this
 * client. If gdk_pointer_xgrab_window or gdk_keyboard_xgrab_window
 * window is NULL, then the other associated fields are ignored
 */
static GdkWindowObject *gdk_pointer_xgrab_window = NULL;
static gulong gdk_pointer_xgrab_serial;
static gboolean gdk_pointer_xgrab_owner_events;

static GdkWindowObject *gdk_keyboard_xgrab_window = NULL;
static gulong gdk_keyboard_xgrab_serial;
static gboolean gdk_keyboard_xgrab_owner_events;

GdkArgDesc _gdk_windowing_args[] = {
  { "display",     GDK_ARG_STRING,   &_gdk_display_name,    (GdkArgFunc)NULL   },
  { "sync",        GDK_ARG_BOOL,     &gdk_synchronize,     (GdkArgFunc)NULL   },
  { "gxid-host",   GDK_ARG_STRING,   &_gdk_input_gxid_host, (GdkArgFunc)NULL   },
  { "gxid-port",   GDK_ARG_INT,      &_gdk_input_gxid_port, (GdkArgFunc)NULL   },
  { NULL }
};

gboolean
_gdk_windowing_init_check (int argc, char **argv)
{
  XKeyboardState keyboard_state;
  XClassHint *class_hint;
  gulong pid;

  _gdk_x11_initialize_locale ();
  
  XSetErrorHandler (gdk_x_error);
  XSetIOErrorHandler (gdk_x_io_error);
  
  gdk_display = XOpenDisplay (_gdk_display_name);
  if (!gdk_display)
    return FALSE;
  
  if (gdk_synchronize)
    XSynchronize (gdk_display, True);
  
  _gdk_screen = DefaultScreen (gdk_display);
  _gdk_root_window = RootWindow (gdk_display, _gdk_screen);
  
  _gdk_leader_window = XCreateSimpleWindow(gdk_display, _gdk_root_window,
					  10, 10, 10, 10, 0, 0 , 0);
  class_hint = XAllocClassHint();
  class_hint->res_name = g_get_prgname ();
  class_hint->res_class = (char *)gdk_get_program_class ();
  XmbSetWMProperties (gdk_display, _gdk_leader_window,
                      NULL, NULL, argv, argc, 
                      NULL, NULL, class_hint);
  XFree (class_hint);

  pid = getpid();
  XChangeProperty (gdk_display, _gdk_leader_window,
		   gdk_x11_get_xatom_by_name ("_NET_WM_PID"),
		   XA_CARDINAL, 32,
		   PropModeReplace,
		   (guchar *)&pid, 1);
  
  _gdk_selection_property = gdk_atom_intern ("GDK_SELECTION", FALSE);

  XGetKeyboardControl (gdk_display, &keyboard_state);
  autorepeat = keyboard_state.global_auto_repeat;

#ifdef HAVE_XKB
  {
    gint xkb_major = XkbMajorVersion;
    gint xkb_minor = XkbMinorVersion;
    if (XkbLibraryVersion (&xkb_major, &xkb_minor))
      {
        xkb_major = XkbMajorVersion;
        xkb_minor = XkbMinorVersion;
	    
        if (XkbQueryExtension (gdk_display, NULL, &_gdk_xkb_event_type, NULL,
                               &xkb_major, &xkb_minor))
          {
	    Bool detectable_autorepeat_supported;

            _gdk_use_xkb = TRUE;

            XkbSelectEvents (gdk_display,
                             XkbUseCoreKbd,
                             XkbMapNotifyMask | XkbStateNotifyMask,
                             XkbMapNotifyMask | XkbStateNotifyMask);

	    XkbSetDetectableAutoRepeat (gdk_display,
					True,
					&detectable_autorepeat_supported);

	    GDK_NOTE (MISC, g_message ("Detectable autorepeat %s.",
				       detectable_autorepeat_supported ? "supported" : "not supported"));
	    
	    _gdk_have_xkb_autorepeat = detectable_autorepeat_supported;
          }
      }
  }
#endif
  
  return TRUE;
}

void
gdk_set_use_xshm (gboolean use_xshm)
{
}

gboolean
gdk_get_use_xshm (void)
{
  return _gdk_use_xshm;
}

static GdkGrabStatus
gdk_x11_convert_grab_status (gint status)
{
  switch (status)
    {
    case GrabSuccess:
      return GDK_GRAB_SUCCESS;
    case AlreadyGrabbed:
      return GDK_GRAB_ALREADY_GRABBED;
    case GrabInvalidTime:
      return GDK_GRAB_INVALID_TIME;
    case GrabNotViewable:
      return GDK_GRAB_NOT_VIEWABLE;
    case GrabFrozen:
      return GDK_GRAB_FROZEN;
    }

  g_assert_not_reached();

  return 0;
}

/*
 *--------------------------------------------------------------
 * gdk_pointer_grab
 *
 *   Grabs the pointer to a specific window
 *
 * Arguments:
 *   "window" is the window which will receive the grab
 *   "owner_events" specifies whether events will be reported as is,
 *     or relative to "window"
 *   "event_mask" masks only interesting events
 *   "confine_to" limits the cursor movement to the specified window
 *   "cursor" changes the cursor for the duration of the grab
 *   "time" specifies the time
 *
 * Results:
 *
 * Side effects:
 *   requires a corresponding call to gdk_pointer_ungrab
 *
 *--------------------------------------------------------------
 */

GdkGrabStatus
gdk_pointer_grab (GdkWindow *	  window,
		  gboolean	  owner_events,
		  GdkEventMask	  event_mask,
		  GdkWindow *	  confine_to,
		  GdkCursor *	  cursor,
		  guint32	  time)
{
  gint return_val;
  GdkCursorPrivate *cursor_private;
  guint xevent_mask;
  Window xwindow;
  Window xconfine_to;
  Cursor xcursor;
  unsigned long serial;
  int i;
  
  g_return_val_if_fail (window != NULL, 0);
  g_return_val_if_fail (GDK_IS_WINDOW (window), 0);
  g_return_val_if_fail (confine_to == NULL || GDK_IS_WINDOW (confine_to), 0);
  
  cursor_private = (GdkCursorPrivate*) cursor;
  
  xwindow = GDK_WINDOW_XID (window);
  serial = NextRequest (GDK_WINDOW_XDISPLAY (window));
  
  if (!confine_to || GDK_WINDOW_DESTROYED (confine_to))
    xconfine_to = None;
  else
    xconfine_to = GDK_WINDOW_XID (confine_to);
  
  if (!cursor)
    xcursor = None;
  else
    xcursor = cursor_private->xcursor;
  
  
  xevent_mask = 0;
  for (i = 0; i < _gdk_nenvent_masks; i++)
    {
      if (event_mask & (1 << (i + 1)))
	xevent_mask |= _gdk_event_mask_table[i];
    }
  
  return_val = _gdk_input_grab_pointer (window,
					owner_events,
					event_mask,
					confine_to,
					time);

  if (return_val == GrabSuccess)
    {
      if (!GDK_WINDOW_DESTROYED (window))
	{
#ifdef G_ENABLE_DEBUG
	  if (_gdk_debug_flags & GDK_DEBUG_NOGRABS)
	    return_val = GrabSuccess;
	  else
#endif
	    return_val = XGrabPointer (GDK_WINDOW_XDISPLAY (window),
				       xwindow,
				       owner_events,
				       xevent_mask,
				       GrabModeAsync, GrabModeAsync,
				       xconfine_to,
				       xcursor,
				       time);
	}
      else
	return_val = AlreadyGrabbed;
    }
  
  if (return_val == GrabSuccess)
    {
      gdk_pointer_xgrab_window = (GdkWindowObject *)window;
      gdk_pointer_xgrab_serial = serial;
      gdk_pointer_xgrab_owner_events = owner_events;
    }

  return gdk_x11_convert_grab_status (return_val);
}

/*
 *--------------------------------------------------------------
 * gdk_pointer_ungrab
 *
 *   Releases any pointer grab
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

void
gdk_pointer_ungrab (guint32 time)
{
  _gdk_input_ungrab_pointer (time);
  
  XUngrabPointer (gdk_display, time);
  gdk_pointer_xgrab_window = NULL;
}

/*
 *--------------------------------------------------------------
 * gdk_pointer_is_grabbed
 *
 *   Tell wether there is an active x pointer grab in effect
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gboolean
gdk_pointer_is_grabbed (void)
{
  return gdk_pointer_xgrab_window != NULL;
}

/**
 * gdk_pointer_grab_info_libgtk_only:
 * @grab_window: location to store current grab window
 * @owner_events: location to store boolean indicating whether
 *   the @owner_events flag to gdk_pointer_grab() was %TRUE.
 * 
 * Determines information about the current pointer grab.
 * This is not public API and must not be used by applications.
 * 
 * Return value: %TRUE if this application currently has the
 *  pointer grabbed.
 **/
gboolean
gdk_pointer_grab_info_libgtk_only (GdkWindow **grab_window,
				   gboolean   *owner_events)
{
  if (gdk_pointer_xgrab_window)
    {
      if (grab_window)
        *grab_window = (GdkWindow *)gdk_pointer_xgrab_window;
      if (owner_events)
        *owner_events = gdk_pointer_xgrab_owner_events;

      return TRUE;
    }
  else
    return FALSE;
}

/*
 *--------------------------------------------------------------
 * gdk_keyboard_grab
 *
 *   Grabs the keyboard to a specific window
 *
 * Arguments:
 *   "window" is the window which will receive the grab
 *   "owner_events" specifies whether events will be reported as is,
 *     or relative to "window"
 *   "time" specifies the time
 *
 * Results:
 *
 * Side effects:
 *   requires a corresponding call to gdk_keyboard_ungrab
 *
 *--------------------------------------------------------------
 */

GdkGrabStatus
gdk_keyboard_grab (GdkWindow *	   window,
		   gboolean	   owner_events,
		   guint32	   time)
{
  gint return_val;
  unsigned long serial;
  
  g_return_val_if_fail (window != NULL, 0);
  g_return_val_if_fail (GDK_IS_WINDOW (window), 0);
  
  serial = NextRequest (GDK_WINDOW_XDISPLAY (window));

  if (!GDK_WINDOW_DESTROYED (window))
    {
#ifdef G_ENABLE_DEBUG
      if (_gdk_debug_flags & GDK_DEBUG_NOGRABS)
	return_val = GrabSuccess;
      else
#endif
	return_val = XGrabKeyboard (GDK_WINDOW_XDISPLAY (window),
				    GDK_WINDOW_XID (window),
				    owner_events,
				    GrabModeAsync, GrabModeAsync,
				    time);
    }
  else
    return_val = AlreadyGrabbed;

  if (return_val == GrabSuccess)
    {
      gdk_keyboard_xgrab_window = (GdkWindowObject *)window;
      gdk_keyboard_xgrab_serial = serial;
      gdk_keyboard_xgrab_owner_events = owner_events;
    }

  return gdk_x11_convert_grab_status (return_val);
}

/*
 *--------------------------------------------------------------
 * gdk_keyboard_ungrab
 *
 *   Releases any keyboard grab
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

void
gdk_keyboard_ungrab (guint32 time)
{
  XUngrabKeyboard (gdk_display, time);
  gdk_keyboard_xgrab_window = NULL;
}

/**
 * gdk_keyboard_grab_info_libgtk_only:
 * @grab_window: location to store current grab window
 * @owner_events: location to store boolean indicating whether
 *   the @owner_events flag to gdk_keyboard_grab() was %TRUE.
 * 
 * Determines information about the current keyboard grab.
 * This is not public API and must not be used by applications.
 * 
 * Return value: %TRUE if this application currently has the
 *  keyboard grabbed.
 **/
gboolean
gdk_keyboard_grab_info_libgtk_only (GdkWindow **grab_window,
				    gboolean   *owner_events)
{
  if (gdk_keyboard_xgrab_window)
    {
      if (grab_window)
        *grab_window = (GdkWindow *)gdk_keyboard_xgrab_window;
      if (owner_events)
        *owner_events = gdk_keyboard_xgrab_owner_events;

      return TRUE;
    }
  else
    return FALSE;
}

/**
 * _gdk_xgrab_check_unmap:
 * @window: a #GdkWindow
 * @serial: serial from Unmap event (or from NextRequest(display)
 *   if the unmap is being done by this client.)
 * 
 * Checks to see if an unmap request or event causes the current
 * grab window to become not viewable, and if so, clear the
 * the pointer we keep to it.
 **/
void
_gdk_xgrab_check_unmap (GdkWindow *window,
			gulong     serial)
{
  if (gdk_pointer_xgrab_window && serial >= gdk_pointer_xgrab_serial)
    {
      GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
      GdkWindowObject *tmp = gdk_pointer_xgrab_window;
      

      while (tmp && tmp != private)
	tmp = tmp->parent;

      if (tmp)
	gdk_pointer_xgrab_window = NULL;  
    }

  if (gdk_keyboard_xgrab_window && serial >= gdk_keyboard_xgrab_serial)
    {
      GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
      GdkWindowObject *tmp = gdk_keyboard_xgrab_window;
      

      while (tmp && tmp != private)
	tmp = tmp->parent;

      if (tmp)
	gdk_keyboard_xgrab_window = NULL;  
    }
}

/**
 * _gdk_xgrab_check_destroy:
 * @window: a #GdkWindow
 * 
 * Checks to see if window is the current grab window, and if
 * so, clear the current grab window.
 **/
void
_gdk_xgrab_check_destroy (GdkWindow *window)
{
  if ((GdkWindowObject *)window == gdk_pointer_xgrab_window)
    gdk_pointer_xgrab_window = NULL;

  if ((GdkWindowObject *)window == gdk_keyboard_xgrab_window)
    gdk_keyboard_xgrab_window = NULL;
}

/*
 *--------------------------------------------------------------
 * gdk_screen_width
 *
 *   Return the width of the screen.
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
gdk_screen_width (void)
{
  gint return_val;
  
  return_val = DisplayWidth (gdk_display, _gdk_screen);
  
  return return_val;
}

/*
 *--------------------------------------------------------------
 * gdk_screen_height
 *
 *   Return the height of the screen.
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
gdk_screen_height (void)
{
  gint return_val;
  
  return_val = DisplayHeight (gdk_display, _gdk_screen);
  
  return return_val;
}

/*
 *--------------------------------------------------------------
 * gdk_screen_width_mm
 *
 *   Return the width of the screen in millimeters.
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
gdk_screen_width_mm (void)
{
  gint return_val;
  
  return_val = DisplayWidthMM (gdk_display, _gdk_screen);
  
  return return_val;
}

/*
 *--------------------------------------------------------------
 * gdk_screen_height
 *
 *   Return the height of the screen in millimeters.
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
gdk_screen_height_mm (void)
{
  gint return_val;
  
  return_val = DisplayHeightMM (gdk_display, _gdk_screen);
  
  return return_val;
}

/*
 *--------------------------------------------------------------
 * gdk_set_sm_client_id
 *
 *   Set the SM_CLIENT_ID property on the WM_CLIENT_LEADER window
 *   so that the window manager can save our state using the
 *   X11R6 ICCCM session management protocol. A NULL value should 
 *   be set following disconnection from the session manager to
 *   remove the SM_CLIENT_ID property.
 *
 * Arguments:
 * 
 *   "sm_client_id" specifies the client id assigned to us by the
 *   session manager or NULL to remove the property.
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

void
gdk_set_sm_client_id (const gchar* sm_client_id)
{
  if (sm_client_id && strcmp (sm_client_id, ""))
    {
      XChangeProperty (gdk_display, _gdk_leader_window,
	   	       gdk_x11_get_xatom_by_name ("SM_CLIENT_ID"),
		       XA_STRING, 8, PropModeReplace,
		       sm_client_id, strlen(sm_client_id));
    }
  else
     XDeleteProperty (gdk_display, _gdk_leader_window,
	   	      gdk_x11_get_xatom_by_name ("SM_CLIENT_ID"));
}

void
gdk_beep (void)
{
  XBell(gdk_display, 0);
}

void
_gdk_windowing_exit (void)
{
  pango_x_shutdown_display (gdk_display);
  
  XCloseDisplay (gdk_display);
}

/*
 *--------------------------------------------------------------
 * gdk_x_error
 *
 *   The X error handling routine.
 *
 * Arguments:
 *   "display" is the X display the error orignated from.
 *   "error" is the XErrorEvent that we are handling.
 *
 * Results:
 *   Either we were expecting some sort of error to occur,
 *   in which case we set the "_gdk_error_code" flag, or this
 *   error was unexpected, in which case we will print an
 *   error message and exit. (Since trying to continue will
 *   most likely simply lead to more errors).
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

static int
gdk_x_error (Display	 *display,
	     XErrorEvent *error)
{
  if (error->error_code)
    {
      if (_gdk_error_warnings)
	{
	  gchar buf[64];
          gchar *msg;
          
	  XGetErrorText (display, error->error_code, buf, 63);

          msg =
            g_strdup_printf ("The program '%s' received an X Window System error.\n"
                             "This probably reflects a bug in the program.\n"
                             "The error was '%s'.\n"
                             "  (Details: serial %ld error_code %d request_code %d minor_code %d)\n"
                             "  (Note to programmers: normally, X errors are reported asynchronously;\n"
                             "   that is, you will receive the error a while after causing it.\n"
                             "   To debug your program, run it with the --sync command line\n"
                             "   option to change this behavior. You can then get a meaningful\n"
                             "   backtrace from your debugger if you break on the gdk_x_error() function.)",
                             g_get_prgname (),
                             buf,
                             error->serial, 
                             error->error_code, 
                             error->request_code,
                             error->minor_code);
          
#ifdef G_ENABLE_DEBUG	  
	  g_error ("%s", msg);
#else /* !G_ENABLE_DEBUG */
	  fprintf (stderr, "%s\n", msg);

	  exit(1);
#endif /* G_ENABLE_DEBUG */
	}
      _gdk_error_code = error->error_code;
    }
  
  return 0;
}

/*
 *--------------------------------------------------------------
 * gdk_x_io_error
 *
 *   The X I/O error handling routine.
 *
 * Arguments:
 *   "display" is the X display the error orignated from.
 *
 * Results:
 *   An X I/O error basically means we lost our connection
 *   to the X server. There is not much we can do to
 *   continue, so simply print an error message and exit.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

static int
gdk_x_io_error (Display *display)
{
  /* This is basically modelled after the code in XLib. We need
   * an explicit error handler here, so we can disable our atexit()
   * which would otherwise cause a nice segfault.
   * We fprintf(stderr, instead of g_warning() because g_warning()
   * could possibly be redirected to a dialog
   */
  if (errno == EPIPE)
    {
      fprintf (stderr,
               "The application '%s' lost its connection to the display %s;\n"
               "most likely the X server was shut down or you killed/destroyed\n"
               "the application.\n",
               g_get_prgname (),
               gdk_display ? DisplayString (gdk_display) : gdk_get_display());
    }
  else
    {
      fprintf (stderr, "%s: Fatal IO error %d (%s) on X server %s.\n",
               g_get_prgname (),
	       errno, g_strerror (errno),
	       gdk_display ? DisplayString (gdk_display) : gdk_get_display());
    }

  /* Disable the atexit shutdown for GDK */
  gdk_initialized = 0;
  
  exit(1);
}

/*************************************************************
 * gdk_error_trap_push:
 *     Push an error trap. X errors will be trapped until
 *     the corresponding gdk_error_pop(), which will return
 *     the error code, if any.
 *   arguments:
 *     
 *   results:
 *************************************************************/

void
gdk_error_trap_push (void)
{
  GSList *node;
  GdkErrorTrap *trap;

  if (gdk_error_trap_free_list)
    {
      node = gdk_error_trap_free_list;
      gdk_error_trap_free_list = gdk_error_trap_free_list->next;
    }
  else
    {
      node = g_slist_alloc ();
      node->data = g_new (GdkErrorTrap, 1);
    }

  node->next = gdk_error_traps;
  gdk_error_traps = node;
  
  trap = node->data;
  trap->old_handler = XSetErrorHandler (gdk_x_error);
  trap->error_code = _gdk_error_code;
  trap->error_warnings = _gdk_error_warnings;

  _gdk_error_code = 0;
  _gdk_error_warnings = 0;
}

/*************************************************************
 * gdk_error_trap_pop:
 *     Pop an error trap added with gdk_error_push()
 *   arguments:
 *     
 *   results:
 *     0, if no error occured, otherwise the error code.
 *************************************************************/

gint
gdk_error_trap_pop (void)
{
  GSList *node;
  GdkErrorTrap *trap;
  gint result;

  g_return_val_if_fail (gdk_error_traps != NULL, 0);

  node = gdk_error_traps;
  gdk_error_traps = gdk_error_traps->next;

  node->next = gdk_error_trap_free_list;
  gdk_error_trap_free_list = node;
  
  result = _gdk_error_code;
  
  trap = node->data;
  _gdk_error_code = trap->error_code;
  _gdk_error_warnings = trap->error_warnings;
  XSetErrorHandler (trap->old_handler);
  
  return result;
}

gchar *
gdk_get_display (void)
{
  return (gchar *)XDisplayName (_gdk_display_name);
}

gint 
gdk_send_xevent (Window window, gboolean propagate, glong event_mask,
		 XEvent *event_send)
{
  gboolean result;
  
  gdk_error_trap_push ();
  result = XSendEvent (gdk_display, window, propagate, event_mask, event_send);
  XSync (gdk_display, False);
  
  return result && gdk_error_trap_pop() == Success;
}

void
_gdk_region_get_xrectangles (GdkRegion   *region,
                             gint         x_offset,
                             gint         y_offset,
                             XRectangle **rects,
                             gint        *n_rects)
{
  XRectangle *rectangles = g_new (XRectangle, region->numRects);
  GdkRegionBox *boxes = region->rects;
  gint i;
  
  for (i = 0; i < region->numRects; i++)
    {
      rectangles[i].x = CLAMP (boxes[i].x1 + x_offset, G_MINSHORT, G_MAXSHORT);
      rectangles[i].y = CLAMP (boxes[i].y1 + y_offset, G_MINSHORT, G_MAXSHORT);
      rectangles[i].width = CLAMP (boxes[i].x2 + x_offset, G_MINSHORT, G_MAXSHORT) - rectangles[i].x;
      rectangles[i].height = CLAMP (boxes[i].y2 + y_offset, G_MINSHORT, G_MAXSHORT) - rectangles[i].y;
    }

  *rects = rectangles;
  *n_rects = region->numRects;
}

/* FIXME put in GdkDisplay */
static gint grab_count = 0;
void
gdk_x11_grab_server (void)
{ 
  if (grab_count == 0)
    XGrabServer (gdk_display);
  ++grab_count;
}

void
gdk_x11_ungrab_server (void)
{
  g_return_if_fail (grab_count > 0);
  
  --grab_count;
  if (grab_count == 0)
    XUngrabServer (gdk_display);
}

/**
 * gdk_x11_get_default_screen:
 * 
 * Gets the default GTK+ screen number.
 * 
 * Return value: returns the screen number specified by
 *   the --display command line option on the DISPLAY environment
 *   variable gdk_init() calls XOpenDisplay().
 **/
gint
gdk_x11_get_default_screen (void)
{
  return _gdk_screen;
}

Window
gdk_x11_get_default_root_xwindow (void)
{
  return _gdk_root_window;
}

Display *
gdk_x11_get_default_xdisplay (void)
{
  return gdk_display;
}