gtk2/gdk/x11/gdkdisplay-x11.c

/* GDK - The GIMP Drawing Kit
 * gdkdisplay-x11.c
 * 
 * Copyright 2001 Sun Microsystems Inc.
 * Copyright (C) 2004 Nokia Corporation
 *
 * Erwann Chenede <erwann.chenede@sun.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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.
 */

#include "config.h"

#include "gdkasync.h"
#include "gdkdisplay.h"
#include "gdkeventsource.h"
#include "gdkeventtranslator.h"
#include "gdkinternals.h"
#include "gdkscreen.h"
#include "gdkinternals.h"
#include "gdkdeviceprivate.h"
#include "gdkkeysprivate.h"
#include "gdkdevicemanager.h"
#include "xsettings-client.h"
#include "gdkdisplay-x11.h"
#include "gdkprivate-x11.h"
#include "gdkscreen-x11.h"

#include <glib.h>
#include <glib/gprintf.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

#include <X11/Xatom.h>

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

#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif

#include <X11/extensions/shape.h>

#ifdef HAVE_XCOMPOSITE
#include <X11/extensions/Xcomposite.h>
#endif

#ifdef HAVE_XDAMAGE
#include <X11/extensions/Xdamage.h>
#endif

#ifdef HAVE_RANDR
#include <X11/extensions/Xrandr.h>
#endif

typedef struct _GdkErrorTrap  GdkErrorTrap;

struct _GdkErrorTrap
{
  /* Next sequence when trap was pushed, i.e. first sequence to
   * ignore
   */
  gulong start_sequence;

  /* Next sequence when trap was popped, i.e. first sequence
   * to not ignore. 0 if trap is still active.
   */
  gulong end_sequence;

  /* Most recent error code within the sequence */
  int error_code;
};

static void   gdk_x11_display_dispose            (GObject            *object);
static void   gdk_x11_display_finalize           (GObject            *object);

static void     gdk_x11_display_event_translator_init (GdkEventTranslatorIface *iface);

static gboolean gdk_x11_display_translate_event (GdkEventTranslator *translator,
                                                 GdkDisplay         *display,
                                                 GdkEvent           *event,
                                                 XEvent             *xevent);

#ifdef HAVE_X11R6
static void gdk_internal_connection_watch (Display  *display,
					   XPointer  arg,
					   gint      fd,
					   gboolean  opening,
					   XPointer *watch_data);
#endif /* HAVE_X11R6 */

typedef struct _GdkEventTypeX11 GdkEventTypeX11;

struct _GdkEventTypeX11
{
  gint base;
  gint n_events;
};

/* Note that we never *directly* use WM_LOCALE_NAME, WM_PROTOCOLS,
 * but including them here has the side-effect of getting them
 * into the internal Xlib cache
 */
static const char *const precache_atoms[] = {
  "UTF8_STRING",
  "WM_CLIENT_LEADER",
  "WM_DELETE_WINDOW",
  "WM_ICON_NAME",
  "WM_LOCALE_NAME",
  "WM_NAME",
  "WM_PROTOCOLS",
  "WM_TAKE_FOCUS",
  "WM_WINDOW_ROLE",
  "_NET_ACTIVE_WINDOW",
  "_NET_CURRENT_DESKTOP",
  "_NET_FRAME_EXTENTS",
  "_NET_STARTUP_ID",
  "_NET_WM_CM_S0",
  "_NET_WM_DESKTOP",
  "_NET_WM_ICON",
  "_NET_WM_ICON_NAME",
  "_NET_WM_NAME",
  "_NET_WM_PID",
  "_NET_WM_PING",
  "_NET_WM_STATE",
  "_NET_WM_STATE_ABOVE",
  "_NET_WM_STATE_BELOW",
  "_NET_WM_STATE_FULLSCREEN",
  "_NET_WM_STATE_MODAL",
  "_NET_WM_STATE_MAXIMIZED_VERT",
  "_NET_WM_STATE_MAXIMIZED_HORZ",
  "_NET_WM_STATE_SKIP_TASKBAR",
  "_NET_WM_STATE_SKIP_PAGER",
  "_NET_WM_STATE_STICKY",
  "_NET_WM_SYNC_REQUEST",
  "_NET_WM_SYNC_REQUEST_COUNTER",
  "_NET_WM_WINDOW_TYPE",
  "_NET_WM_WINDOW_TYPE_NORMAL",
  "_NET_WM_USER_TIME",
  "_NET_VIRTUAL_ROOTS",
  "GDK_SELECTION"
};

static char *gdk_sm_client_id;

G_DEFINE_TYPE_WITH_CODE (GdkX11Display, gdk_x11_display, GDK_TYPE_DISPLAY,
                         G_IMPLEMENT_INTERFACE (GDK_TYPE_EVENT_TRANSLATOR,
                                                gdk_x11_display_event_translator_init))


static void
gdk_x11_display_init (GdkX11Display *display)
{
  _gdk_x11_display_manager_add_display (gdk_display_manager_get (),
                                        GDK_DISPLAY (display));
}

static void
gdk_x11_display_event_translator_init (GdkEventTranslatorIface *iface)
{
  iface->translate_event = gdk_x11_display_translate_event;
}

static void
do_net_wm_state_changes (GdkWindow *window)
{
  GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (window);
  GdkWindowState old_state;

  if (GDK_WINDOW_DESTROYED (window) ||
      gdk_window_get_window_type (window) != GDK_WINDOW_TOPLEVEL)
    return;

  old_state = gdk_window_get_state (window);

  /* For found_sticky to remain TRUE, we have to also be on desktop
   * 0xFFFFFFFF
   */
  if (old_state & GDK_WINDOW_STATE_STICKY)
    {
      if (!(toplevel->have_sticky && toplevel->on_all_desktops))
        gdk_synthesize_window_state (window,
                                     GDK_WINDOW_STATE_STICKY,
                                     0);
    }
  else
    {
      if (toplevel->have_sticky || toplevel->on_all_desktops)
        gdk_synthesize_window_state (window,
                                     0,
                                     GDK_WINDOW_STATE_STICKY);
    }

  if (old_state & GDK_WINDOW_STATE_FULLSCREEN)
    {
      if (!toplevel->have_fullscreen)
        gdk_synthesize_window_state (window,
                                     GDK_WINDOW_STATE_FULLSCREEN,
                                     0);
    }
  else
    {
      if (toplevel->have_fullscreen)
        gdk_synthesize_window_state (window,
                                     0,
                                     GDK_WINDOW_STATE_FULLSCREEN);
    }

  /* Our "maximized" means both vertical and horizontal; if only one,
   * we don't expose that via GDK
   */
  if (old_state & GDK_WINDOW_STATE_MAXIMIZED)
    {
      if (!(toplevel->have_maxvert && toplevel->have_maxhorz))
        gdk_synthesize_window_state (window,
                                     GDK_WINDOW_STATE_MAXIMIZED,
                                     0);
    }
  else
    {
      if (toplevel->have_maxvert && toplevel->have_maxhorz)
        gdk_synthesize_window_state (window,
                                     0,
                                     GDK_WINDOW_STATE_MAXIMIZED);
    }
}

static void
gdk_check_wm_desktop_changed (GdkWindow *window)
{
  GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (window);
  GdkDisplay *display = GDK_WINDOW_DISPLAY (window);

  Atom type;
  gint format;
  gulong nitems;
  gulong bytes_after;
  guchar *data;
  gulong *desktop;

  type = None;
  gdk_x11_display_error_trap_push (display);
  XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
                      GDK_WINDOW_XID (window),
                      gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_DESKTOP"),
                      0, G_MAXLONG, False, XA_CARDINAL, &type,
                      &format, &nitems,
                      &bytes_after, &data);
  gdk_x11_display_error_trap_pop_ignored (display);

  if (type != None)
    {
      desktop = (gulong *)data;
      toplevel->on_all_desktops = (*desktop == 0xFFFFFFFF);
      XFree (desktop);
    }
  else
    toplevel->on_all_desktops = FALSE;

  do_net_wm_state_changes (window);
}

static void
gdk_check_wm_state_changed (GdkWindow *window)
{
  GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (window);
  GdkDisplay *display = GDK_WINDOW_DISPLAY (window);

  Atom type;
  gint format;
  gulong nitems;
  gulong bytes_after;
  guchar *data;
  Atom *atoms = NULL;
  gulong i;

  gboolean had_sticky = toplevel->have_sticky;

  toplevel->have_sticky = FALSE;
  toplevel->have_maxvert = FALSE;
  toplevel->have_maxhorz = FALSE;
  toplevel->have_fullscreen = FALSE;

  type = None;
  gdk_x11_display_error_trap_push (display);
  XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), GDK_WINDOW_XID (window),
		      gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE"),
		      0, G_MAXLONG, False, XA_ATOM, &type, &format, &nitems,
		      &bytes_after, &data);
  gdk_x11_display_error_trap_pop_ignored (display);

  if (type != None)
    {
      Atom sticky_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_STICKY");
      Atom maxvert_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_MAXIMIZED_VERT");
      Atom maxhorz_atom	= gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_MAXIMIZED_HORZ");
      Atom fullscreen_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_FULLSCREEN");

      atoms = (Atom *)data;

      i = 0;
      while (i < nitems)
        {
          if (atoms[i] == sticky_atom)
            toplevel->have_sticky = TRUE;
          else if (atoms[i] == maxvert_atom)
            toplevel->have_maxvert = TRUE;
          else if (atoms[i] == maxhorz_atom)
            toplevel->have_maxhorz = TRUE;
          else if (atoms[i] == fullscreen_atom)
            toplevel->have_fullscreen = TRUE;

          ++i;
        }

      XFree (atoms);
    }

  /* When have_sticky is turned on, we have to check the DESKTOP property
   * as well.
   */
  if (toplevel->have_sticky && !had_sticky)
    gdk_check_wm_desktop_changed (window);
  else
    do_net_wm_state_changes (window);
}

static GdkWindow *
get_event_window (GdkEventTranslator *translator,
                  XEvent             *xevent)
{
  GdkDisplay *display;
  Window xwindow;

  display = (GdkDisplay *) translator;

  switch (xevent->type)
    {
    case DestroyNotify:
      xwindow = xevent->xdestroywindow.window;
      break;
    case UnmapNotify:
      xwindow = xevent->xunmap.window;
      break;
    case MapNotify:
      xwindow = xevent->xmap.window;
      break;
    case ConfigureNotify:
      xwindow = xevent->xconfigure.window;
      break;
    default:
      xwindow = xevent->xany.window;
    }

  return gdk_x11_window_lookup_for_display (display, xwindow);
}

static gboolean
gdk_x11_display_translate_event (GdkEventTranslator *translator,
                                 GdkDisplay         *display,
                                 GdkEvent           *event,
                                 XEvent             *xevent)
{
  GdkWindow *window;
  GdkWindowImplX11 *window_impl = NULL;
  GdkScreen *screen = NULL;
  GdkX11Screen *x11_screen = NULL;
  GdkToplevelX11 *toplevel = NULL;
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
  gboolean return_val;
  Window xwindow = None;

  /* Find the GdkWindow that this event relates to.
   * Basically this means substructure events
   * are reported same as structure events
   */
  window = get_event_window (translator, xevent);

  if (window)
    {
      /* We may receive events such as NoExpose/GraphicsExpose
       * and ShmCompletion for pixmaps
       */
      if (!GDK_IS_WINDOW (window))
        return FALSE;

      screen = GDK_WINDOW_SCREEN (window);
      x11_screen = GDK_X11_SCREEN (screen);
      toplevel = _gdk_x11_window_get_toplevel (window);
      window_impl = GDK_WINDOW_IMPL_X11 (window->impl);
      xwindow = GDK_WINDOW_XID (window);

      g_object_ref (window);
    }

  event->any.window = window;
  event->any.send_event = xevent->xany.send_event ? TRUE : FALSE;

  if (window && GDK_WINDOW_DESTROYED (window))
    {
      if (xevent->type != DestroyNotify)
	{
	  return_val = FALSE;
	  goto done;
	}
    }

  if (xevent->type == DestroyNotify)
    {
      int i, n;

      n = gdk_display_get_n_screens (display);
      for (i = 0; i < n; i++)
        {
          screen = gdk_display_get_screen (display, i);
          x11_screen = GDK_X11_SCREEN (screen);

          if (x11_screen->wmspec_check_window == xwindow)
            {
              x11_screen->wmspec_check_window = None;
              x11_screen->last_wmspec_check_time = 0;
              g_free (x11_screen->window_manager_name);
              x11_screen->window_manager_name = g_strdup ("unknown");

              /* careful, reentrancy */
              _gdk_x11_screen_window_manager_changed (screen);

              return_val = FALSE;
              goto done;
            }
        }
    }

  /* We do a "manual" conversion of the XEvent to a
   *  GdkEvent. The structures are mostly the same so
   *  the conversion is fairly straightforward. We also
   *  optionally print debugging info regarding events
   *  received.
   */

  return_val = TRUE;

  switch (xevent->type)
    {
    case KeymapNotify:
      GDK_NOTE (EVENTS,
		g_message ("keymap notify"));

      /* Not currently handled */
      return_val = FALSE;
      break;

    case Expose:
      GDK_NOTE (EVENTS,
		g_message ("expose:\t\twindow: %ld  %d	x,y: %d %d  w,h: %d %d%s",
			   xevent->xexpose.window, xevent->xexpose.count,
			   xevent->xexpose.x, xevent->xexpose.y,
			   xevent->xexpose.width, xevent->xexpose.height,
			   event->any.send_event ? " (send)" : ""));

      if (window == NULL)
        {
          return_val = FALSE;
          break;
        }

      {
	GdkRectangle expose_rect;

	expose_rect.x = xevent->xexpose.x;
	expose_rect.y = xevent->xexpose.y;
	expose_rect.width = xevent->xexpose.width;
	expose_rect.height = xevent->xexpose.height;

        _gdk_x11_window_process_expose (window, xevent->xexpose.serial, &expose_rect);
        return_val = FALSE;
      }

      break;

    case GraphicsExpose:
      {
	GdkRectangle expose_rect;

        GDK_NOTE (EVENTS,
		  g_message ("graphics expose:\tdrawable: %ld",
			     xevent->xgraphicsexpose.drawable));

        if (window == NULL)
          {
            return_val = FALSE;
            break;
          }

	expose_rect.x = xevent->xgraphicsexpose.x;
	expose_rect.y = xevent->xgraphicsexpose.y;
	expose_rect.width = xevent->xgraphicsexpose.width;
	expose_rect.height = xevent->xgraphicsexpose.height;

        _gdk_x11_window_process_expose (window, xevent->xgraphicsexpose.serial, &expose_rect);
        return_val = FALSE;
      }
      break;

    case VisibilityNotify:
#ifdef G_ENABLE_DEBUG
      if (_gdk_debug_flags & GDK_DEBUG_EVENTS)
	switch (xevent->xvisibility.state)
	  {
	  case VisibilityFullyObscured:
	    g_message ("visibility notify:\twindow: %ld	 none",
		       xevent->xvisibility.window);
	    break;
	  case VisibilityPartiallyObscured:
	    g_message ("visibility notify:\twindow: %ld	 partial",
		       xevent->xvisibility.window);
	    break;
	  case VisibilityUnobscured:
	    g_message ("visibility notify:\twindow: %ld	 full",
		       xevent->xvisibility.window);
	    break;
	  }
#endif /* G_ENABLE_DEBUG */

      if (window == NULL)
        {
          return_val = FALSE;
          break;
        }

      event->visibility.type = GDK_VISIBILITY_NOTIFY;
      event->visibility.window = window;

      switch (xevent->xvisibility.state)
	{
	case VisibilityFullyObscured:
	  event->visibility.state = GDK_VISIBILITY_FULLY_OBSCURED;
	  break;

	case VisibilityPartiallyObscured:
	  event->visibility.state = GDK_VISIBILITY_PARTIAL;
	  break;

	case VisibilityUnobscured:
	  event->visibility.state = GDK_VISIBILITY_UNOBSCURED;
	  break;
	}

      break;

    case CreateNotify:
      GDK_NOTE (EVENTS,
		g_message ("create notify:\twindow: %ld  x,y: %d %d	w,h: %d %d  b-w: %d  parent: %ld	 ovr: %d",
			   xevent->xcreatewindow.window,
			   xevent->xcreatewindow.x,
			   xevent->xcreatewindow.y,
			   xevent->xcreatewindow.width,
			   xevent->xcreatewindow.height,
			   xevent->xcreatewindow.border_width,
			   xevent->xcreatewindow.parent,
			   xevent->xcreatewindow.override_redirect));
      /* not really handled */
      break;

    case DestroyNotify:
      GDK_NOTE (EVENTS,
		g_message ("destroy notify:\twindow: %ld",
			   xevent->xdestroywindow.window));

      /* Ignore DestroyNotify from SubstructureNotifyMask */
      if (xevent->xdestroywindow.window == xevent->xdestroywindow.event)
	{
	  event->any.type = GDK_DESTROY;
	  event->any.window = window;

	  return_val = window && !GDK_WINDOW_DESTROYED (window);

	  if (window && GDK_WINDOW_XID (window) != x11_screen->xroot_window)
	    gdk_window_destroy_notify (window);
	}
      else
	return_val = FALSE;

      break;

    case UnmapNotify:
      GDK_NOTE (EVENTS,
		g_message ("unmap notify:\t\twindow: %ld",
			   xevent->xmap.window));

      event->any.type = GDK_UNMAP;
      event->any.window = window;

      /* If we are shown (not withdrawn) and get an unmap, it means we
       * were iconified in the X sense. If we are withdrawn, and get
       * an unmap, it means we hid the window ourselves, so we
       * will have already flipped the iconified bit off.
       */
      if (window)
        {
          if (GDK_WINDOW_IS_MAPPED (window))
            gdk_synthesize_window_state (window,
                                         0,
                                         GDK_WINDOW_STATE_ICONIFIED);

          _gdk_x11_window_grab_check_unmap (window, xevent->xany.serial);
        }

      break;

    case MapNotify:
      GDK_NOTE (EVENTS,
		g_message ("map notify:\t\twindow: %ld",
			   xevent->xmap.window));

      event->any.type = GDK_MAP;
      event->any.window = window;

      /* Unset iconified if it was set */
      if (window && (window->state & GDK_WINDOW_STATE_ICONIFIED))
        gdk_synthesize_window_state (window,
                                     GDK_WINDOW_STATE_ICONIFIED,
                                     0);

      break;

    case ReparentNotify:
      GDK_NOTE (EVENTS,
		g_message ("reparent notify:\twindow: %ld  x,y: %d %d  parent: %ld	ovr: %d",
			   xevent->xreparent.window,
			   xevent->xreparent.x,
			   xevent->xreparent.y,
			   xevent->xreparent.parent,
			   xevent->xreparent.override_redirect));

      /* Not currently handled */
      return_val = FALSE;
      break;

    case ConfigureNotify:
      GDK_NOTE (EVENTS,
		g_message ("configure notify:\twindow: %ld  x,y: %d %d	w,h: %d %d  b-w: %d  above: %ld	 ovr: %d%s",
			   xevent->xconfigure.window,
			   xevent->xconfigure.x,
			   xevent->xconfigure.y,
			   xevent->xconfigure.width,
			   xevent->xconfigure.height,
			   xevent->xconfigure.border_width,
			   xevent->xconfigure.above,
			   xevent->xconfigure.override_redirect,
			   !window
			   ? " (discarding)"
			   : window->window_type == GDK_WINDOW_CHILD
			   ? " (discarding child)"
			   : xevent->xconfigure.event != xevent->xconfigure.window
			   ? " (discarding substructure)"
			   : ""));
      if (window && GDK_WINDOW_TYPE (window) == GDK_WINDOW_ROOT)
        {
	  window->width = xevent->xconfigure.width;
	  window->height = xevent->xconfigure.height;

	  _gdk_window_update_size (window);
	  _gdk_x11_window_update_size (GDK_WINDOW_IMPL_X11 (window->impl));
	  _gdk_x11_screen_size_changed (screen, xevent);
        }

#ifdef HAVE_XSYNC
      if (toplevel && display_x11->use_sync && !XSyncValueIsZero (toplevel->pending_counter_value))
	{
	  toplevel->current_counter_value = toplevel->pending_counter_value;
	  XSyncIntToValue (&toplevel->pending_counter_value, 0);
	}
#endif

    if (!window ||
	  xevent->xconfigure.event != xevent->xconfigure.window ||
          GDK_WINDOW_TYPE (window) == GDK_WINDOW_CHILD ||
          GDK_WINDOW_TYPE (window) == GDK_WINDOW_ROOT)
	return_val = FALSE;
      else
	{
	  event->configure.type = GDK_CONFIGURE;
	  event->configure.window = window;
	  event->configure.width = xevent->xconfigure.width;
	  event->configure.height = xevent->xconfigure.height;

	  if (!xevent->xconfigure.send_event &&
	      !xevent->xconfigure.override_redirect &&
	      !GDK_WINDOW_DESTROYED (window))
	    {
	      gint tx = 0;
	      gint ty = 0;
	      Window child_window = 0;

	      gdk_x11_display_error_trap_push (display);
	      if (XTranslateCoordinates (GDK_WINDOW_XDISPLAY (window),
					 GDK_WINDOW_XID (window),
					 x11_screen->xroot_window,
					 0, 0,
					 &tx, &ty,
					 &child_window))
		{
		  event->configure.x = tx;
		  event->configure.y = ty;
		}
	      gdk_x11_display_error_trap_pop_ignored (display);
	    }
	  else
	    {
	      event->configure.x = xevent->xconfigure.x;
	      event->configure.y = xevent->xconfigure.y;
	    }
	  window->x = event->configure.x;
	  window->y = event->configure.y;
	  window->width = xevent->xconfigure.width;
	  window->height = xevent->xconfigure.height;

	  _gdk_window_update_size (window);
	  _gdk_x11_window_update_size (GDK_WINDOW_IMPL_X11 (window->impl));

          if (window->resize_count >= 1)
            {
              window->resize_count -= 1;

              if (window->resize_count == 0)
                _gdk_x11_moveresize_configure_done (display, window);
            }
        }
      break;

    case PropertyNotify:
      GDK_NOTE (EVENTS,
		g_message ("property notify:\twindow: %ld, atom(%ld): %s%s%s",
			   xevent->xproperty.window,
			   xevent->xproperty.atom,
			   "\"",
			   gdk_x11_get_xatom_name_for_display (display, xevent->xproperty.atom),
			   "\""));

      if (window == NULL)
        {
	  return_val = FALSE;
          break;
        }

      /* We compare with the serial of the last time we mapped the
       * window to avoid refetching properties that we set ourselves
       */
      if (toplevel &&
	  xevent->xproperty.serial >= toplevel->map_serial)
	{
	  if (xevent->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE"))
	    gdk_check_wm_state_changed (window);

	  if (xevent->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_DESKTOP"))
	    gdk_check_wm_desktop_changed (window);
	}

      if (window->event_mask & GDK_PROPERTY_CHANGE_MASK)
	{
	  event->property.type = GDK_PROPERTY_NOTIFY;
	  event->property.window = window;
	  event->property.atom = gdk_x11_xatom_to_atom_for_display (display, xevent->xproperty.atom);
	  event->property.time = xevent->xproperty.time;
	  event->property.state = xevent->xproperty.state;
	}
      else
	return_val = FALSE;

      break;

    case SelectionClear:
      GDK_NOTE (EVENTS,
		g_message ("selection clear:\twindow: %ld",
			   xevent->xproperty.window));

      if (_gdk_x11_selection_filter_clear_event (&xevent->xselectionclear))
	{
	  event->selection.type = GDK_SELECTION_CLEAR;
	  event->selection.window = window;
	  event->selection.selection = gdk_x11_xatom_to_atom_for_display (display, xevent->xselectionclear.selection);
	  event->selection.time = xevent->xselectionclear.time;
	}
      else
	return_val = FALSE;

      break;

    case SelectionRequest:
      GDK_NOTE (EVENTS,
		g_message ("selection request:\twindow: %ld",
			   xevent->xproperty.window));

      event->selection.type = GDK_SELECTION_REQUEST;
      event->selection.window = window;
      event->selection.selection = gdk_x11_xatom_to_atom_for_display (display, xevent->xselectionrequest.selection);
      event->selection.target = gdk_x11_xatom_to_atom_for_display (display, xevent->xselectionrequest.target);
      event->selection.property = gdk_x11_xatom_to_atom_for_display (display, xevent->xselectionrequest.property);
      event->selection.requestor = xevent->xselectionrequest.requestor;
      event->selection.time = xevent->xselectionrequest.time;

      break;

    case SelectionNotify:
      GDK_NOTE (EVENTS,
		g_message ("selection notify:\twindow: %ld",
			   xevent->xproperty.window));

      event->selection.type = GDK_SELECTION_NOTIFY;
      event->selection.window = window;
      event->selection.selection = gdk_x11_xatom_to_atom_for_display (display, xevent->xselection.selection);
      event->selection.target = gdk_x11_xatom_to_atom_for_display (display, xevent->xselection.target);
      if (xevent->xselection.property == None)
        event->selection.property = GDK_NONE;
      else
        event->selection.property = gdk_x11_xatom_to_atom_for_display (display, xevent->xselection.property);
      event->selection.time = xevent->xselection.time;

      break;

    case ColormapNotify:
      GDK_NOTE (EVENTS,
		g_message ("colormap notify:\twindow: %ld",
			   xevent->xcolormap.window));

      /* Not currently handled */
      return_val = FALSE;
      break;

    case ClientMessage:
      {
	GList *tmp_list;
	GdkFilterReturn result = GDK_FILTER_CONTINUE;
	GdkAtom message_type = gdk_x11_xatom_to_atom_for_display (display, xevent->xclient.message_type);

	GDK_NOTE (EVENTS,
		  g_message ("client message:\twindow: %ld",
			     xevent->xclient.window));

	tmp_list = display_x11->client_filters;
	while (tmp_list)
	  {
	    GdkClientFilter *filter = tmp_list->data;
	    tmp_list = tmp_list->next;

	    if (filter->type == message_type)
	      {
		result = (*filter->function) (xevent, event, filter->data);
		if (result != GDK_FILTER_CONTINUE)
		  break;
	      }
	  }

	switch (result)
	  {
	  case GDK_FILTER_REMOVE:
	    return_val = FALSE;
	    break;
	  case GDK_FILTER_TRANSLATE:
	    return_val = TRUE;
	    break;
	  case GDK_FILTER_CONTINUE:
	    /* Send unknown ClientMessage's on to Gtk for it to use */
            if (window == NULL)
              {
                return_val = FALSE;
              }
            else
              {
                event->client.type = GDK_CLIENT_EVENT;
                event->client.window = window;
                event->client.message_type = message_type;
                event->client.data_format = xevent->xclient.format;
                memcpy(&event->client.data, &xevent->xclient.data,
                       sizeof(event->client.data));
              }
            break;
          }
      }

      break;

    case MappingNotify:
      GDK_NOTE (EVENTS,
		g_message ("mapping notify"));

      /* Let XLib know that there is a new keyboard mapping.
       */
      XRefreshKeyboardMapping (&xevent->xmapping);
      _gdk_x11_keymap_keys_changed (display);
      return_val = FALSE;
      break;

    default:
#ifdef HAVE_XFIXES
      if (xevent->type - display_x11->xfixes_event_base == XFixesSelectionNotify)
	{
	  XFixesSelectionNotifyEvent *selection_notify = (XFixesSelectionNotifyEvent *)xevent;

	  _gdk_x11_screen_process_owner_change (screen, xevent);
	  
	  event->owner_change.type = GDK_OWNER_CHANGE;
	  event->owner_change.window = window;
	  event->owner_change.owner = selection_notify->owner;
	  event->owner_change.reason = selection_notify->subtype;
	  event->owner_change.selection = 
	    gdk_x11_xatom_to_atom_for_display (display, 
					       selection_notify->selection);
	  event->owner_change.time = selection_notify->timestamp;
	  event->owner_change.selection_time = selection_notify->selection_timestamp;
	  
	  return_val = TRUE;
	}
      else
#endif
#ifdef HAVE_RANDR
      if (xevent->type - display_x11->xrandr_event_base == RRScreenChangeNotify ||
          xevent->type - display_x11->xrandr_event_base == RRNotify)
	{
          if (screen)
            _gdk_x11_screen_size_changed (screen, xevent);
	}
      else
#endif
#if defined(HAVE_XCOMPOSITE) && defined (HAVE_XDAMAGE) && defined (HAVE_XFIXES)
      if (display_x11->have_xdamage && window && window->composited &&
	  xevent->type == display_x11->xdamage_event_base + XDamageNotify &&
	  ((XDamageNotifyEvent *) xevent)->damage == window_impl->damage)
	{
	  XDamageNotifyEvent *damage_event = (XDamageNotifyEvent *) xevent;
	  XserverRegion repair;
	  GdkRectangle rect;

	  rect.x = window->x + damage_event->area.x;
	  rect.y = window->y + damage_event->area.y;
	  rect.width = damage_event->area.width;
	  rect.height = damage_event->area.height;

	  repair = XFixesCreateRegion (display_x11->xdisplay,
				       &damage_event->area, 1);
	  XDamageSubtract (display_x11->xdisplay,
			   window_impl->damage,
			   repair, None);
	  XFixesDestroyRegion (display_x11->xdisplay, repair);

          if (window->parent != NULL)
           _gdk_x11_window_process_expose (window->parent,
                                           damage_event->serial, &rect);

	  return_val = TRUE;
	}
      else
#endif
#ifdef HAVE_XKB
      if (xevent->type == display_x11->xkb_event_type)
	{
	  XkbEvent *xkb_event = (XkbEvent *) xevent;

	  switch (xkb_event->any.xkb_type)
	    {
	    case XkbNewKeyboardNotify:
	    case XkbMapNotify:
	      _gdk_x11_keymap_keys_changed (display);

	      return_val = FALSE;
	      break;

	    case XkbStateNotify:
	      _gdk_x11_keymap_state_changed (display, xevent);
	      break;
	    }
	}
      else
#endif
        return_val = FALSE;
    }

 done:
  if (return_val)
    {
      if (event->any.window)
	g_object_ref (event->any.window);
    }
  else
    {
      /* Mark this event as having no resources to be freed */
      event->any.window = NULL;
      event->any.type = GDK_NOTHING;
    }

  if (window)
    g_object_unref (window);

  return return_val;
}

static GdkFilterReturn
gdk_wm_protocols_filter (GdkXEvent *xev,
			 GdkEvent  *event,
			 gpointer data)
{
  XEvent *xevent = (XEvent *)xev;
  GdkWindow *win = event->any.window;
  GdkDisplay *display;
  Atom atom;

  if (!win)
      return GDK_FILTER_REMOVE;

  display = GDK_WINDOW_DISPLAY (win);
  atom = (Atom)xevent->xclient.data.l[0];

  if (atom == gdk_x11_get_xatom_by_name_for_display (display, "WM_DELETE_WINDOW"))
    {
  /* The delete window request specifies a window
   *  to delete. We don't actually destroy the
   *  window because "it is only a request". (The
   *  window might contain vital data that the
   *  program does not want destroyed). Instead
   *  the event is passed along to the program,
   *  which should then destroy the window.
   */
      GDK_NOTE (EVENTS,
		g_message ("delete window:\t\twindow: %ld",
			   xevent->xclient.window));

      event->any.type = GDK_DELETE;

      gdk_x11_window_set_user_time (win, xevent->xclient.data.l[1]);

      return GDK_FILTER_TRANSLATE;
    }
  else if (atom == gdk_x11_get_xatom_by_name_for_display (display, "WM_TAKE_FOCUS"))
    {
      GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (event->any.window);

      /* There is no way of knowing reliably whether we are viewable;
       * _gdk_x11_set_input_focus_safe() traps errors asynchronously.
       */
      if (toplevel && win->accept_focus)
	_gdk_x11_set_input_focus_safe (display, toplevel->focus_window,
				       RevertToParent,
				       xevent->xclient.data.l[1]);

      return GDK_FILTER_REMOVE;
    }
  else if (atom == gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_PING") &&
	   !_gdk_x11_display_is_root_window (display,
					     xevent->xclient.window))
    {
      XClientMessageEvent xclient = xevent->xclient;

      xclient.window = GDK_WINDOW_XROOTWIN (win);
      XSendEvent (GDK_WINDOW_XDISPLAY (win),
		  xclient.window,
		  False,
		  SubstructureRedirectMask | SubstructureNotifyMask, (XEvent *)&xclient);

      return GDK_FILTER_REMOVE;
    }
  else if (atom == gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_SYNC_REQUEST") &&
	   GDK_X11_DISPLAY (display)->use_sync)
    {
      GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (event->any.window);
      if (toplevel)
	{
#ifdef HAVE_XSYNC
	  XSyncIntsToValue (&toplevel->pending_counter_value,
			    xevent->xclient.data.l[2],
			    xevent->xclient.data.l[3]);
#endif
	}
      return GDK_FILTER_REMOVE;
    }

  return GDK_FILTER_CONTINUE;
}

static void
gdk_event_init (GdkDisplay *display)
{
  GdkX11Display *display_x11;
  GdkDeviceManager *device_manager;

  display_x11 = GDK_X11_DISPLAY (display);
  display_x11->event_source = gdk_x11_event_source_new (display);

  gdk_x11_event_source_add_translator ((GdkEventSource *) display_x11->event_source,
                                       GDK_EVENT_TRANSLATOR (display));

  device_manager = gdk_display_get_device_manager (display);
  gdk_x11_event_source_add_translator ((GdkEventSource *) display_x11->event_source,
                                        GDK_EVENT_TRANSLATOR (device_manager));

  gdk_display_add_client_message_filter (display,
                                         gdk_atom_intern_static_string ("WM_PROTOCOLS"),
                                         gdk_wm_protocols_filter,
                                         NULL);
}

static void
gdk_x11_display_init_input (GdkDisplay *display)
{
  GdkX11Display *display_x11;
  GdkDeviceManager *device_manager;
  GdkDevice *device;
  GList *list, *l;

  display_x11 = GDK_X11_DISPLAY (display);
  device_manager = gdk_display_get_device_manager (display);

  /* For backwards compatibility, just add
   * floating devices that are not keyboards.
   */
  list = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_FLOATING);

  for (l = list; l; l = l->next)
    {
      device = l->data;

      if (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
        continue;

      display_x11->input_devices = g_list_prepend (display_x11->input_devices,
                                                   g_object_ref (l->data));
    }

  g_list_free (list);

  /* Now set "core" pointer to the first
   * master device that is a pointer.
   */
  list = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_MASTER);

  for (l = list; l; l = l->next)
    {
      device = l->data;

      if (gdk_device_get_source (device) != GDK_SOURCE_MOUSE)
        continue;

      display->core_pointer = device;
      break;
    }

  /* Add the core pointer to the devices list */
  display_x11->input_devices = g_list_prepend (display_x11->input_devices,
                                               g_object_ref (display->core_pointer));

  g_list_free (list);
}

static void
set_sm_client_id (GdkDisplay  *display,
                  const gchar *sm_client_id)
{
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);

  if (gdk_display_is_closed (display))
    return;

  if (sm_client_id && strcmp (sm_client_id, ""))
    XChangeProperty (display_x11->xdisplay, display_x11->leader_window,
                     gdk_x11_get_xatom_by_name_for_display (display, "SM_CLIENT_ID"),
                     XA_STRING, 8, PropModeReplace, (guchar *)sm_client_id,
                     strlen (sm_client_id));
  else
    XDeleteProperty (display_x11->xdisplay, display_x11->leader_window,
                     gdk_x11_get_xatom_by_name_for_display (display, "SM_CLIENT_ID"));
}

GdkDisplay *
_gdk_x11_display_open (const gchar *display_name)
{
  Display *xdisplay;
  GdkDisplay *display;
  GdkX11Display *display_x11;
  GdkWindowAttr attr;
  gint argc;
  gchar *argv[1];

  XClassHint *class_hint;
  gulong pid;
  gint i;
  gint ignore;
  gint maj, min;

  xdisplay = XOpenDisplay (display_name);
  if (!xdisplay)
    return NULL;
  
  display = g_object_new (GDK_TYPE_X11_DISPLAY, NULL);
  display_x11 = GDK_X11_DISPLAY (display);

  display_x11->xdisplay = xdisplay;

#ifdef HAVE_X11R6  
  /* Set up handlers for Xlib internal connections */
  XAddConnectionWatch (xdisplay, gdk_internal_connection_watch, NULL);
#endif /* HAVE_X11R6 */
  
  _gdk_x11_precache_atoms (display, precache_atoms, G_N_ELEMENTS (precache_atoms));

  /* RandR must be initialized before we initialize the screens */
  display_x11->have_randr12 = FALSE;
  display_x11->have_randr13 = FALSE;
#ifdef HAVE_RANDR
  if (XRRQueryExtension (display_x11->xdisplay,
			 &display_x11->xrandr_event_base, &ignore))
  {
      int major, minor;

      XRRQueryVersion (display_x11->xdisplay, &major, &minor);

      if ((major == 1 && minor >= 2) || major > 1) {
	  display_x11->have_randr12 = TRUE;
	  if (minor >= 3 || major > 1)
	      display_x11->have_randr13 = TRUE;
      }

       gdk_x11_register_standard_event_type (display, display_x11->xrandr_event_base, RRNumberEvents);
  }
#endif

  /* initialize the display's screens */ 
  display_x11->screens = g_new (GdkScreen *, ScreenCount (display_x11->xdisplay));
  for (i = 0; i < ScreenCount (display_x11->xdisplay); i++)
    display_x11->screens[i] = _gdk_x11_screen_new (display, i);

  /* We need to initialize events after we have the screen
   * structures in places
   */
  for (i = 0; i < ScreenCount (display_x11->xdisplay); i++)
    _gdk_x11_screen_init_events (display_x11->screens[i]);

  /*set the default screen */
  display_x11->default_screen = display_x11->screens[DefaultScreen (display_x11->xdisplay)];

  display->device_manager = _gdk_x11_device_manager_new (display);

  gdk_event_init (display);

  attr.window_type = GDK_WINDOW_TOPLEVEL;
  attr.wclass = GDK_INPUT_OUTPUT;
  attr.x = 10;
  attr.y = 10;
  attr.width = 10;
  attr.height = 10;
  attr.event_mask = 0;

  display_x11->leader_gdk_window = gdk_window_new (GDK_X11_SCREEN (display_x11->default_screen)->root_window, 
						   &attr, GDK_WA_X | GDK_WA_Y);
  (_gdk_x11_window_get_toplevel (display_x11->leader_gdk_window))->is_leader = TRUE;

  display_x11->leader_window = GDK_WINDOW_XID (display_x11->leader_gdk_window);

  display_x11->leader_window_title_set = FALSE;

#ifdef HAVE_XFIXES
  if (XFixesQueryExtension (display_x11->xdisplay, 
			    &display_x11->xfixes_event_base, 
			    &ignore))
    {
      display_x11->have_xfixes = TRUE;

      gdk_x11_register_standard_event_type (display,
					    display_x11->xfixes_event_base, 
					    XFixesNumberEvents);
    }
  else
#endif
    display_x11->have_xfixes = FALSE;

#ifdef HAVE_XCOMPOSITE
  if (XCompositeQueryExtension (display_x11->xdisplay,
				&ignore, &ignore))
    {
      int major, minor;

      XCompositeQueryVersion (display_x11->xdisplay, &major, &minor);

      /* Prior to Composite version 0.4, composited windows clipped their
       * parents, so you had to use IncludeInferiors to draw to the parent
       * This isn't useful for our purposes, so require 0.4
       */
      display_x11->have_xcomposite = major > 0 || (major == 0 && minor >= 4);
    }
  else
#endif
    display_x11->have_xcomposite = FALSE;

#ifdef HAVE_XDAMAGE
  if (XDamageQueryExtension (display_x11->xdisplay,
			     &display_x11->xdamage_event_base,
			     &ignore))
    {
      display_x11->have_xdamage = TRUE;

      gdk_x11_register_standard_event_type (display,
					    display_x11->xdamage_event_base,
					    XDamageNumberEvents);
    }
  else
#endif
    display_x11->have_xdamage = FALSE;

  display_x11->have_shapes = FALSE;
  display_x11->have_input_shapes = FALSE;

  if (XShapeQueryExtension (GDK_DISPLAY_XDISPLAY (display), &display_x11->shape_event_base, &ignore))
    {
      display_x11->have_shapes = TRUE;
#ifdef ShapeInput
      if (XShapeQueryVersion (GDK_DISPLAY_XDISPLAY (display), &maj, &min))
	display_x11->have_input_shapes = (maj == 1 && min >= 1);
#endif
    }

  display_x11->trusted_client = TRUE;
  {
    Window root, child;
    int rootx, rooty, winx, winy;
    unsigned int xmask;

    gdk_x11_display_error_trap_push (display);
    XQueryPointer (display_x11->xdisplay,
		   GDK_X11_SCREEN (display_x11->default_screen)->xroot_window,
		   &root, &child, &rootx, &rooty, &winx, &winy, &xmask);
    if (G_UNLIKELY (gdk_x11_display_error_trap_pop (display) == BadWindow))
      {
	g_warning ("Connection to display %s appears to be untrusted. Pointer and keyboard grabs and inter-client communication may not work as expected.", gdk_display_get_name (display));
	display_x11->trusted_client = FALSE;
      }
  }

  if (g_getenv ("GDK_SYNCHRONIZE"))
    XSynchronize (display_x11->xdisplay, True);

  class_hint = XAllocClassHint();
  class_hint->res_name = g_get_prgname ();

  class_hint->res_class = (char *)gdk_get_program_class ();

  /* XmbSetWMProperties sets the RESOURCE_NAME environment variable
   * from argv[0], so we just synthesize an argument array here.
   */
  argc = 1;
  argv[0] = g_get_prgname ();

  XmbSetWMProperties (display_x11->xdisplay,
		      display_x11->leader_window,
		      NULL, NULL, argv, argc, NULL, NULL,
		      class_hint);
  XFree (class_hint);

  if (gdk_sm_client_id)
    set_sm_client_id (display, gdk_sm_client_id);

  pid = getpid ();
  XChangeProperty (display_x11->xdisplay,
		   display_x11->leader_window,
		   gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_PID"),
		   XA_CARDINAL, 32, PropModeReplace, (guchar *) & pid, 1);

  /* We don't yet know a valid time. */
  display_x11->user_time = 0;
  
#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 (display_x11->xdisplay, 
			       NULL, &display_x11->xkb_event_type, NULL,
                               &xkb_major, &xkb_minor))
          {
	    Bool detectable_autorepeat_supported;
	    
	    display_x11->use_xkb = TRUE;

            XkbSelectEvents (display_x11->xdisplay,
                             XkbUseCoreKbd,
                             XkbNewKeyboardNotifyMask | XkbMapNotifyMask | XkbStateNotifyMask,
                             XkbNewKeyboardNotifyMask | XkbMapNotifyMask | XkbStateNotifyMask);

	    /* keep this in sync with _gdk_x11_keymap_state_changed() */
	    XkbSelectEventDetails (display_x11->xdisplay,
				   XkbUseCoreKbd, XkbStateNotify,
				   XkbAllStateComponentsMask,
                                   XkbGroupLockMask|XkbModifierLockMask);

	    XkbSetDetectableAutoRepeat (display_x11->xdisplay,
					True,
					&detectable_autorepeat_supported);

	    GDK_NOTE (MISC, g_message ("Detectable autorepeat %s.",
				       detectable_autorepeat_supported ?
				       "supported" : "not supported"));
	    
	    display_x11->have_xkb_autorepeat = detectable_autorepeat_supported;
          }
      }
  }
#endif

  display_x11->use_sync = FALSE;
#ifdef HAVE_XSYNC
  {
    int major, minor;
    int error_base, event_base;
    
    if (XSyncQueryExtension (display_x11->xdisplay,
			     &event_base, &error_base) &&
        XSyncInitialize (display_x11->xdisplay,
                         &major, &minor))
      display_x11->use_sync = TRUE;
  }
#endif

  gdk_x11_display_init_input (display);
  _gdk_x11_display_init_dnd (display);

  for (i = 0; i < ScreenCount (display_x11->xdisplay); i++)
    _gdk_x11_screen_setup (display_x11->screens[i]);

  g_signal_emit_by_name (display, "opened");
  g_signal_emit_by_name (gdk_display_manager_get (), "display-opened", display);

  return display;
}

#ifdef HAVE_X11R6
/*
 * XLib internal connection handling
 */
typedef struct _GdkInternalConnection GdkInternalConnection;

struct _GdkInternalConnection
{
  gint	         fd;
  GSource	*source;
  Display	*display;
};

static gboolean
process_internal_connection (GIOChannel  *gioc,
			     GIOCondition cond,
			     gpointer     data)
{
  GdkInternalConnection *connection = (GdkInternalConnection *)data;

  GDK_THREADS_ENTER ();

  XProcessInternalConnection ((Display*)connection->display, connection->fd);

  GDK_THREADS_LEAVE ();

  return TRUE;
}

static gulong
gdk_x11_display_get_next_serial (GdkDisplay *display)
{
  return NextRequest (GDK_DISPLAY_XDISPLAY (display));
}


static GdkInternalConnection *
gdk_add_connection_handler (Display *display,
			    guint    fd)
{
  GIOChannel *io_channel;
  GdkInternalConnection *connection;

  connection = g_new (GdkInternalConnection, 1);

  connection->fd = fd;
  connection->display = display;
  
  io_channel = g_io_channel_unix_new (fd);
  
  connection->source = g_io_create_watch (io_channel, G_IO_IN);
  g_source_set_callback (connection->source,
			 (GSourceFunc)process_internal_connection, connection, NULL);
  g_source_attach (connection->source, NULL);
  
  g_io_channel_unref (io_channel);
  
  return connection;
}

static void
gdk_remove_connection_handler (GdkInternalConnection *connection)
{
  g_source_destroy (connection->source);
  g_free (connection);
}

static void
gdk_internal_connection_watch (Display  *display,
			       XPointer  arg,
			       gint      fd,
			       gboolean  opening,
			       XPointer *watch_data)
{
  if (opening)
    *watch_data = (XPointer)gdk_add_connection_handler (display, fd);
  else
    gdk_remove_connection_handler ((GdkInternalConnection *)*watch_data);
}
#endif /* HAVE_X11R6 */

static G_CONST_RETURN gchar *
gdk_x11_display_get_name (GdkDisplay *display)
{
  return (gchar *) DisplayString (GDK_X11_DISPLAY (display)->xdisplay);
}

static gint
gdk_x11_display_get_n_screens (GdkDisplay *display)
{
  return ScreenCount (GDK_X11_DISPLAY (display)->xdisplay);
}

static GdkScreen *
gdk_x11_display_get_screen (GdkDisplay *display,
			    gint        screen_num)
{
  g_return_val_if_fail (ScreenCount (GDK_X11_DISPLAY (display)->xdisplay) > screen_num, NULL);

  return GDK_X11_DISPLAY (display)->screens[screen_num];
}

static GdkScreen *
gdk_x11_display_get_default_screen (GdkDisplay *display)
{
  return GDK_X11_DISPLAY (display)->default_screen;
}

gboolean
_gdk_x11_display_is_root_window (GdkDisplay *display,
				 Window      xroot_window)
{
  GdkX11Display *display_x11;
  gint i;

  display_x11 = GDK_X11_DISPLAY (display);

  for (i = 0; i < ScreenCount (display_x11->xdisplay); i++)
    {
      if (GDK_SCREEN_XROOTWIN (display_x11->screens[i]) == xroot_window)
	return TRUE;
    }
  return FALSE;
}

struct XPointerUngrabInfo {
  GdkDisplay *display;
  guint32 time;
};

static void
device_grab_update_callback (GdkDisplay *display,
                             gpointer    data,
                             gulong      serial)
{
  GdkDevice *device = data;

  _gdk_display_device_grab_update (display, device, NULL, serial);
}

#define XSERVER_TIME_IS_LATER(time1, time2)                        \
  ( (( time1 > time2 ) && ( time1 - time2 < ((guint32)-1)/2 )) ||  \
    (( time1 < time2 ) && ( time2 - time1 > ((guint32)-1)/2 ))     \
  )

void
_gdk_x11_display_update_grab_info (GdkDisplay *display,
                                   GdkDevice  *device,
                                   gint        status)
{
  if (status == GrabSuccess)
    _gdk_x11_roundtrip_async (display, device_grab_update_callback, device);
}

void
_gdk_x11_display_update_grab_info_ungrab (GdkDisplay *display,
                                          GdkDevice  *device,
                                          guint32     time,
                                          gulong      serial)
{
  GdkDeviceGrabInfo *grab;

  XFlush (GDK_DISPLAY_XDISPLAY (display));

  grab = _gdk_display_get_last_device_grab (display, device);
  if (grab &&
      (time == GDK_CURRENT_TIME ||
       grab->time == GDK_CURRENT_TIME ||
       !XSERVER_TIME_IS_LATER (grab->time, time)))
    {
      grab->serial_end = serial;
      _gdk_x11_roundtrip_async (display, device_grab_update_callback, device);
    }
}

static void
gdk_x11_display_beep (GdkDisplay *display)
{
#ifdef HAVE_XKB
  XkbBell (GDK_DISPLAY_XDISPLAY (display), None, 0, None);
#else
  XBell (GDK_DISPLAY_XDISPLAY (display), 0);
#endif
}

static void
gdk_x11_display_sync (GdkDisplay *display)
{
  XSync (GDK_DISPLAY_XDISPLAY (display), False);
}

static void
gdk_x11_display_flush (GdkDisplay *display)
{
  if (!display->closed)
    XFlush (GDK_DISPLAY_XDISPLAY (display));
}

static gboolean
gdk_x11_display_has_pending (GdkDisplay *display)
{
  return XPending (GDK_DISPLAY_XDISPLAY (display));
}

static GdkWindow *
gdk_x11_display_get_default_group (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);

  return GDK_X11_DISPLAY (display)->leader_gdk_window;
}

/**
 * gdk_x11_display_grab:
 * @display: a #GdkDisplay 
 * 
 * Call XGrabServer() on @display. 
 * To ungrab the display again, use gdk_x11_display_ungrab(). 
 *
 * gdk_x11_display_grab()/gdk_x11_display_ungrab() calls can be nested.
 *
 * Since: 2.2
 **/
void
gdk_x11_display_grab (GdkDisplay *display)
{
  GdkX11Display *display_x11;
  
  g_return_if_fail (GDK_IS_DISPLAY (display));
  
  display_x11 = GDK_X11_DISPLAY (display);
  
  if (display_x11->grab_count == 0)
    XGrabServer (display_x11->xdisplay);
  display_x11->grab_count++;
}

/**
 * gdk_x11_display_ungrab:
 * @display: a #GdkDisplay
 * 
 * Ungrab @display after it has been grabbed with 
 * gdk_x11_display_grab(). 
 *
 * Since: 2.2
 **/
void
gdk_x11_display_ungrab (GdkDisplay *display)
{
  GdkX11Display *display_x11;
  
  g_return_if_fail (GDK_IS_DISPLAY (display));
  
  display_x11 = GDK_X11_DISPLAY (display);;
  g_return_if_fail (display_x11->grab_count > 0);
  
  display_x11->grab_count--;
  if (display_x11->grab_count == 0)
    {
      XUngrabServer (display_x11->xdisplay);
      XFlush (display_x11->xdisplay);
    }
}

static void
gdk_x11_display_dispose (GObject *object)
{
  GdkDisplay *display = GDK_DISPLAY (object);
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (object);
  gint           i;

  _gdk_x11_display_manager_remove_display (gdk_display_manager_get (), display);

  g_list_foreach (display_x11->input_devices, (GFunc) g_object_run_dispose, NULL);

  for (i = 0; i < ScreenCount (display_x11->xdisplay); i++)
    _gdk_screen_close (display_x11->screens[i]);

  if (display_x11->event_source)
    {
      g_source_destroy (display_x11->event_source);
      g_source_unref (display_x11->event_source);
      display_x11->event_source = NULL;
    }

  G_OBJECT_CLASS (gdk_x11_display_parent_class)->dispose (object);
}

static void
gdk_x11_display_finalize (GObject *object)
{
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (object);
  gint           i;

  /* Keymap */
  if (display_x11->keymap)
    g_object_unref (display_x11->keymap);

  /* Free motif Dnd */
  if (display_x11->motif_target_lists)
    {
      for (i = 0; i < display_x11->motif_n_target_lists; i++)
        g_list_free (display_x11->motif_target_lists[i]);
      g_free (display_x11->motif_target_lists);
    }

  _gdk_x11_cursor_display_finalize (GDK_DISPLAY (display_x11));

  /* Atom Hashtable */
  g_hash_table_destroy (display_x11->atom_from_virtual);
  g_hash_table_destroy (display_x11->atom_to_virtual);

  /* Leader Window */
  XDestroyWindow (display_x11->xdisplay, display_x11->leader_window);

  /* list of filters for client messages */
  g_list_foreach (display_x11->client_filters, (GFunc) g_free, NULL);
  g_list_free (display_x11->client_filters);

  /* List of event window extraction functions */
  g_slist_foreach (display_x11->event_types, (GFunc)g_free, NULL);
  g_slist_free (display_x11->event_types);

  /* input GdkDevice list */
  g_list_foreach (display_x11->input_devices, (GFunc) g_object_unref, NULL);
  g_list_free (display_x11->input_devices);

  /* input GdkWindow list */
  g_list_foreach (display_x11->input_windows, (GFunc) g_free, NULL);
  g_list_free (display_x11->input_windows);

  /* Free all GdkScreens */
  for (i = 0; i < ScreenCount (display_x11->xdisplay); i++)
    g_object_unref (display_x11->screens[i]);
  g_free (display_x11->screens);

  g_free (display_x11->startup_notification_id);

  /* X ID hashtable */
  g_hash_table_destroy (display_x11->xid_ht);

  XCloseDisplay (display_x11->xdisplay);

  /* error traps */
  while (display_x11->error_traps != NULL)
    {
      GdkErrorTrap *trap = display_x11->error_traps->data;

      display_x11->error_traps =
        g_slist_delete_link (display_x11->error_traps,
                             display_x11->error_traps);

      if (trap->end_sequence == 0)
        g_warning ("Display finalized with an unpopped error trap");

      g_slice_free (GdkErrorTrap, trap);
    }

  G_OBJECT_CLASS (gdk_x11_display_parent_class)->finalize (object);
}

/**
 * gdk_x11_lookup_xdisplay:
 * @xdisplay: a pointer to an X Display
 * 
 * Find the #GdkDisplay corresponding to @display, if any exists.
 * 
 * Return value: (transfer none): the #GdkDisplay, if found, otherwise %NULL.
 *
 * Since: 2.2
 **/
GdkDisplay *
gdk_x11_lookup_xdisplay (Display *xdisplay)
{
  GSList *list, *l;
  GdkDisplay *display;

  display = NULL;

  list = gdk_display_manager_list_displays (gdk_display_manager_get ());

  for (l = list; l; l = l->next)
    {
      if (GDK_DISPLAY_XDISPLAY (l->data) == xdisplay)
        {
          display = l->data;
          break;
        }
    }

  g_slist_free (list);

  return display;
}

/**
 * _gdk_x11_display_screen_for_xrootwin:
 * @display: a #GdkDisplay
 * @xrootwin: window ID for one of of the screen's of the display.
 * 
 * Given the root window ID of one of the screen's of a #GdkDisplay,
 * finds the screen.
 * 
 * Return value: (transfer none): the #GdkScreen corresponding to
 *     @xrootwin, or %NULL.
 **/
GdkScreen *
_gdk_x11_display_screen_for_xrootwin (GdkDisplay *display,
				      Window      xrootwin)
{
  gint i;

  for (i = 0; i < ScreenCount (GDK_X11_DISPLAY (display)->xdisplay); i++)
    {
      GdkScreen *screen = gdk_display_get_screen (display, i);
      if (GDK_SCREEN_XROOTWIN (screen) == xrootwin)
	return screen;
    }

  return NULL;
}

/**
 * gdk_x11_display_get_xdisplay: (skip)
 * @display: a #GdkDisplay
 * @returns: an X display.
 *
 * Returns the X display of a #GdkDisplay.
 *
 * Since: 2.2
 */
Display *
gdk_x11_display_get_xdisplay (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  return GDK_X11_DISPLAY (display)->xdisplay;
}

void
_gdk_x11_display_make_default (GdkDisplay *display)
{
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
  const gchar *startup_id;

  g_free (display_x11->startup_notification_id);
  display_x11->startup_notification_id = NULL;

  startup_id = g_getenv ("DESKTOP_STARTUP_ID");
  if (startup_id && *startup_id != '\0')
    {
      if (!g_utf8_validate (startup_id, -1, NULL))
        g_warning ("DESKTOP_STARTUP_ID contains invalid UTF-8");
      else
        gdk_x11_display_set_startup_notification_id (display, startup_id);

      /* Clear the environment variable so it won't be inherited by
       * child processes and confuse things.
       */
      g_unsetenv ("DESKTOP_STARTUP_ID");
    }
}

static void
broadcast_xmessage (GdkDisplay *display,
		    const char *message_type,
		    const char *message_type_begin,
		    const char *message)
{
  Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);
  GdkScreen *screen = gdk_display_get_default_screen (display);
  GdkWindow *root_window = gdk_screen_get_root_window (screen);
  Window xroot_window = GDK_WINDOW_XID (root_window);
  
  Atom type_atom;
  Atom type_atom_begin;
  Window xwindow;

  if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
    return;

  {
    XSetWindowAttributes attrs;

    attrs.override_redirect = True;
    attrs.event_mask = PropertyChangeMask | StructureNotifyMask;

    xwindow =
      XCreateWindow (xdisplay,
                     xroot_window,
                     -100, -100, 1, 1,
                     0,
                     CopyFromParent,
                     CopyFromParent,
                     (Visual *)CopyFromParent,
                     CWOverrideRedirect | CWEventMask,
                     &attrs);
  }

  type_atom = gdk_x11_get_xatom_by_name_for_display (display,
                                                     message_type);
  type_atom_begin = gdk_x11_get_xatom_by_name_for_display (display,
                                                           message_type_begin);
  
  {
    XClientMessageEvent xclient;
    const char *src;
    const char *src_end;
    char *dest;
    char *dest_end;
    
		memset(&xclient, 0, sizeof (xclient));
    xclient.type = ClientMessage;
    xclient.message_type = type_atom_begin;
    xclient.display =xdisplay;
    xclient.window = xwindow;
    xclient.format = 8;

    src = message;
    src_end = message + strlen (message) + 1; /* +1 to include nul byte */
    
    while (src != src_end)
      {
        dest = &xclient.data.b[0];
        dest_end = dest + 20;        
        
        while (dest != dest_end &&
               src != src_end)
          {
            *dest = *src;
            ++dest;
            ++src;
          }

	while (dest != dest_end)
	  {
	    *dest = 0;
	    ++dest;
	  }
        
        XSendEvent (xdisplay,
                    xroot_window,
                    False,
                    PropertyChangeMask,
                    (XEvent *)&xclient);

        xclient.message_type = type_atom;
      }
  }

  XDestroyWindow (xdisplay, xwindow);
  XFlush (xdisplay);
}

/**
 * gdk_x11_display_broadcast_startup_message:
 * @display: a #GdkDisplay
 * @message_type: startup notification message type ("new", "change",
 * or "remove")
 * @...: a list of key/value pairs (as strings), terminated by a
 * %NULL key. (A %NULL value for a key will cause that key to be
 * skipped in the output.)
 *
 * Sends a startup notification message of type @message_type to
 * @display. 
 *
 * This is a convenience function for use by code that implements the
 * freedesktop startup notification specification. Applications should
 * not normally need to call it directly. See the <ulink
 * url="http://standards.freedesktop.org/startup-notification-spec/startup-notification-latest.txt">Startup
 * Notification Protocol specification</ulink> for
 * definitions of the message types and keys that can be used.
 *
 * Since: 2.12
 **/
void
gdk_x11_display_broadcast_startup_message (GdkDisplay *display,
					   const char *message_type,
					   ...)
{
  GString *message;
  va_list ap;
  const char *key, *value, *p;

  message = g_string_new (message_type);
  g_string_append_c (message, ':');

  va_start (ap, message_type);
  while ((key = va_arg (ap, const char *)))
    {
      value = va_arg (ap, const char *);
      if (!value)
	continue;

      g_string_append_printf (message, " %s=\"", key);
      for (p = value; *p; p++)
	{
	  switch (*p)
	    {
	    case ' ':
	    case '"':
	    case '\\':
	      g_string_append_c (message, '\\');
	      break;
	    }

	  g_string_append_c (message, *p);
	}
      g_string_append_c (message, '\"');
    }
  va_end (ap);

  broadcast_xmessage (display,
                      "_NET_STARTUP_INFO",
                      "_NET_STARTUP_INFO_BEGIN",
                      message->str);

  g_string_free (message, TRUE);
}

static void
gdk_x11_display_notify_startup_complete (GdkDisplay  *display,
                                         const gchar *startup_id)
{
  if (startup_id == NULL)
    {
      startup_id = GDK_X11_DISPLAY (display)->startup_notification_id;
      if (startup_id == NULL)
        return;
    }

  gdk_x11_display_broadcast_startup_message (display, "remove",
                                             "ID", startup_id,
                                             NULL);
}

static gboolean
gdk_x11_display_supports_selection_notification (GdkDisplay *display)
{
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);

  return display_x11->have_xfixes;
}

static gboolean
gdk_x11_display_request_selection_notification (GdkDisplay *display,
						GdkAtom     selection)

{
#ifdef HAVE_XFIXES
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
  Atom atom;

  if (display_x11->have_xfixes)
    {
      atom = gdk_x11_atom_to_xatom_for_display (display, 
						selection);
      XFixesSelectSelectionInput (display_x11->xdisplay, 
				  display_x11->leader_window,
				  atom,
				  XFixesSetSelectionOwnerNotifyMask |
				  XFixesSelectionWindowDestroyNotifyMask |
				  XFixesSelectionClientCloseNotifyMask);
      return TRUE;
    }
  else
#endif
    return FALSE;
}

static gboolean
gdk_x11_display_supports_clipboard_persistence (GdkDisplay *display)
{
  Atom clipboard_manager;

  /* It might make sense to cache this */
  clipboard_manager = gdk_x11_get_xatom_by_name_for_display (display, "CLIPBOARD_MANAGER");
  return XGetSelectionOwner (GDK_X11_DISPLAY (display)->xdisplay, clipboard_manager) != None;
}

static void
gdk_x11_display_store_clipboard (GdkDisplay    *display,
				 GdkWindow     *clipboard_window,
				 guint32        time_,
				 const GdkAtom *targets,
				 gint           n_targets)
{
  GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
  Atom clipboard_manager, save_targets;

  g_return_if_fail (GDK_WINDOW_IS_X11 (clipboard_window));

  clipboard_manager = gdk_x11_get_xatom_by_name_for_display (display, "CLIPBOARD_MANAGER");
  save_targets = gdk_x11_get_xatom_by_name_for_display (display, "SAVE_TARGETS");

  gdk_x11_display_error_trap_push (display);

  if (XGetSelectionOwner (display_x11->xdisplay, clipboard_manager) != None)
    {
      Atom property_name = None;
      Atom *xatoms;
      int i;

      if (n_targets > 0)
        {
          property_name = gdk_x11_get_xatom_by_name_for_display (display, "GDK_SELECTION");

	  xatoms = g_new (Atom, n_targets);
	  for (i = 0; i < n_targets; i++)
	    xatoms[i] = gdk_x11_atom_to_xatom_for_display (display, targets[i]);

	  XChangeProperty (display_x11->xdisplay, GDK_WINDOW_XID (clipboard_window),
			   property_name, XA_ATOM,
			   32, PropModeReplace, (guchar *)xatoms, n_targets);
	  g_free (xatoms);

	}

      XConvertSelection (display_x11->xdisplay,
                         clipboard_manager, save_targets, property_name,
                         GDK_WINDOW_XID (clipboard_window), time_);

    }
  gdk_x11_display_error_trap_pop_ignored (display);

}

/**
 * gdk_x11_display_get_user_time:
 * @display: a #GdkDisplay
 *
 * Returns the timestamp of the last user interaction on 
 * @display. The timestamp is taken from events caused
 * by user interaction such as key presses or pointer 
 * movements. See gdk_x11_window_set_user_time().
 *
 * Returns: the timestamp of the last user interaction 
 *
 * Since: 2.8
 */
guint32
gdk_x11_display_get_user_time (GdkDisplay *display)
{
  return GDK_X11_DISPLAY (display)->user_time;
}

static gboolean
gdk_x11_display_supports_shapes (GdkDisplay *display)
{
  return GDK_X11_DISPLAY (display)->have_shapes;
}

static gboolean
gdk_x11_display_supports_input_shapes (GdkDisplay *display)
{
  return GDK_X11_DISPLAY (display)->have_input_shapes;
}


/**
 * gdk_x11_display_get_startup_notification_id:
 * @display: a #GdkDisplay
 *
 * Gets the startup notification ID for a display.
 * 
 * Returns: the startup notification ID for @display
 *
 * Since: 2.12
 */
G_CONST_RETURN gchar *
gdk_x11_display_get_startup_notification_id (GdkDisplay *display)
{
  return GDK_X11_DISPLAY (display)->startup_notification_id;
}

/**
 * gdk_x11_display_set_startup_notification_id:
 * @display: a #GdkDisplay
 * @startup_id: the startup notification ID (must be valid utf8)
 *
 * Sets the startup notification ID for a display.
 *
 * This is usually taken from the value of the DESKTOP_STARTUP_ID
 * environment variable, but in some cases (such as the application not
 * being launched using exec()) it can come from other sources.
 *
 * If the ID contains the string "_TIME" then the portion following that
 * string is taken to be the X11 timestamp of the event that triggered
 * the application to be launched and the GDK current event time is set
 * accordingly.
 *
 * The startup ID is also what is used to signal that the startup is
 * complete (for example, when opening a window or when calling
 * gdk_notify_startup_complete()).
 *
 * Since: 3.0
 **/
void
gdk_x11_display_set_startup_notification_id (GdkDisplay  *display,
                                             const gchar *startup_id)
{
  GdkX11Display *display_x11;
  gchar *time_str;

  display_x11 = GDK_X11_DISPLAY (display);

  g_free (display_x11->startup_notification_id);
  display_x11->startup_notification_id = g_strdup (startup_id);

  /* Find the launch time from the startup_id, if it's there.  Newer spec
   * states that the startup_id is of the form <unique>_TIME<timestamp>
   */
  time_str = g_strrstr (startup_id, "_TIME");
  if (time_str != NULL)
    {
      gulong retval;
      gchar *end;
      errno = 0;

      /* Skip past the "_TIME" part */
      time_str += 5;

      retval = strtoul (time_str, &end, 0);
      if (end != time_str && errno == 0)
        display_x11->user_time = retval;
    }

  /* Set the startup id on the leader window so it
   * applies to all windows we create on this display
   */
  XChangeProperty (display_x11->xdisplay,
                   display_x11->leader_window,
                   gdk_x11_get_xatom_by_name_for_display (display, "_NET_STARTUP_ID"),
                   gdk_x11_get_xatom_by_name_for_display (display, "UTF8_STRING"), 8,
                   PropModeReplace,
                   (guchar *)startup_id, strlen (startup_id));
}

static gboolean
gdk_x11_display_supports_composite (GdkDisplay *display)
{
  GdkX11Display *x11_display = GDK_X11_DISPLAY (display);

  return x11_display->have_xcomposite &&
	 x11_display->have_xdamage &&
	 x11_display->have_xfixes;
}

static GList *
gdk_x11_display_list_devices (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);

  return GDK_X11_DISPLAY (display)->input_devices;
}

static gboolean
gdk_x11_display_send_client_message (GdkDisplay     *display,
				     GdkEvent       *event,
				     GdkNativeWindow winid)
{
  XEvent sev;

  g_return_val_if_fail(event != NULL, FALSE);

  /* Set up our event to send, with the exception of its target window */
  sev.xclient.type = ClientMessage;
  sev.xclient.display = GDK_DISPLAY_XDISPLAY (display);
  sev.xclient.format = event->client.data_format;
  sev.xclient.window = winid;
  memcpy(&sev.xclient.data, &event->client.data, sizeof (sev.xclient.data));
  sev.xclient.message_type = gdk_x11_atom_to_xatom_for_display (display, event->client.message_type);

  return _gdk_x11_display_send_xevent (display, winid, False, NoEventMask, &sev);
}

static void
gdk_x11_display_add_client_message_filter (GdkDisplay   *display,
					   GdkAtom       message_type,
					   GdkFilterFunc func,
					   gpointer      data)
{
  GdkClientFilter *filter;
  g_return_if_fail (GDK_IS_DISPLAY (display));
  filter = g_new (GdkClientFilter, 1);

  filter->type = message_type;
  filter->function = func;
  filter->data = data;

  GDK_X11_DISPLAY(display)->client_filters =
    g_list_append (GDK_X11_DISPLAY (display)->client_filters,
		   filter);
}

/**
 * gdk_x11_register_standard_event_type:
 * @display: a #GdkDisplay
 * @event_base: first event type code to register
 * @n_events: number of event type codes to register
 *
 * Registers interest in receiving extension events with type codes
 * between @event_base and <literal>event_base + n_events - 1</literal>.
 * The registered events must have the window field in the same place
 * as core X events (this is not the case for e.g. XKB extension events).
 *
 * If an event type is registered, events of this type will go through
 * global and window-specific filters (see gdk_window_add_filter()).
 * Unregistered events will only go through global filters.
 * GDK may register the events of some X extensions on its own.
 *
 * This function should only be needed in unusual circumstances, e.g.
 * when filtering XInput extension events on the root window.
 *
 * Since: 2.4
 **/
void
gdk_x11_register_standard_event_type (GdkDisplay *display,
				      gint        event_base,
				      gint        n_events)
{
  GdkEventTypeX11 *event_type;
  GdkX11Display *display_x11;

  display_x11 = GDK_X11_DISPLAY (display);
  event_type = g_new (GdkEventTypeX11, 1);

  event_type->base = event_base;
  event_type->n_events = n_events;

  display_x11->event_types = g_slist_prepend (display_x11->event_types, event_type);
}

/* compare X sequence numbers handling wraparound */
#define SEQUENCE_COMPARE(a,op,b) (((long) (a) - (long) (b)) op 0)

/* delivers an error event from the error handler in gdkmain-x11.c */
void
_gdk_x11_display_error_event (GdkDisplay  *display,
                              XErrorEvent *error)
{
  GdkX11Display *display_x11;
  GSList *tmp_list;
  gboolean ignore;

  display_x11 = GDK_X11_DISPLAY (display);

  ignore = FALSE;
  for (tmp_list = display_x11->error_traps;
       tmp_list != NULL;
       tmp_list = tmp_list->next)
    {
      GdkErrorTrap *trap;

      trap = tmp_list->data;

      if (SEQUENCE_COMPARE (trap->start_sequence, <=, error->serial) &&
          (trap->end_sequence == 0 ||
           SEQUENCE_COMPARE (trap->end_sequence, >, error->serial)))
        {
          ignore = TRUE;
          trap->error_code = error->error_code;
          break; /* only innermost trap gets the error code */
        }
    }

  if (!ignore)
    {
      gchar buf[64];
      gchar *msg;

      XGetErrorText (display_x11->xdisplay, 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 */
      g_warning ("%s\n", msg);

      exit (1);
#endif /* G_ENABLE_DEBUG */
    }
}

static void
delete_outdated_error_traps (GdkX11Display *display_x11)
{
  GSList *tmp_list;
  gulong processed_sequence;

  processed_sequence = XLastKnownRequestProcessed (display_x11->xdisplay);

  tmp_list = display_x11->error_traps;
  while (tmp_list != NULL)
    {
      GdkErrorTrap *trap = tmp_list->data;

      if (trap->end_sequence != 0 &&
          SEQUENCE_COMPARE (trap->end_sequence, <=, processed_sequence))
        {
          GSList *free_me = tmp_list;

          tmp_list = tmp_list->next;
          display_x11->error_traps =
            g_slist_delete_link (display_x11->error_traps, free_me);
          g_slice_free (GdkErrorTrap, trap);
        }
      else
        {
          tmp_list = tmp_list->next;
        }
    }
}

/**
 * gdk_x11_display_error_trap_push:
 * @display: a #GdkDisplay
 *
 * Begins a range of X requests on @display for which X error events
 * will be ignored. Unignored errors (when no trap is pushed) will abort
 * the application. Use gdk_x11_display_error_trap_pop() or
 * gdk_x11_display_error_trap_pop_ignored()to lift a trap pushed
 * with this function.
 *
 * See also gdk_error_trap_push() to push a trap on all displays.
 *
 * Since: 3.0
 */
void
gdk_x11_display_error_trap_push (GdkDisplay *display)
{
  GdkX11Display *display_x11;
  GdkErrorTrap *trap;

  display_x11 = GDK_X11_DISPLAY (display);

  delete_outdated_error_traps (display_x11);

  /* set up the Xlib callback to tell us about errors */
  _gdk_x11_error_handler_push ();

  trap = g_slice_new0 (GdkErrorTrap);

  trap->start_sequence = XNextRequest (display_x11->xdisplay);
  trap->error_code = Success;

  display_x11->error_traps =
    g_slist_prepend (display_x11->error_traps, trap);
}

static gint
gdk_x11_display_error_trap_pop_internal (GdkDisplay *display,
                                         gboolean    need_code)
{
  GdkX11Display *display_x11;
  GdkErrorTrap *trap;
  GSList *tmp_list;
  int result;

  display_x11 = GDK_X11_DISPLAY (display);

  g_return_val_if_fail (display_x11->error_traps != NULL, Success);

  /* Find the first trap that hasn't been popped already */
  trap = NULL; /* quiet gcc */
  for (tmp_list = display_x11->error_traps;
       tmp_list != NULL;
       tmp_list = tmp_list->next)
    {
      trap = tmp_list->data;

      if (trap->end_sequence == 0)
        break;
    }

  g_return_val_if_fail (trap != NULL, Success);
  g_assert (trap->end_sequence == 0);

  /* May need to sync to fill in trap->error_code if we care about
   * getting an error code.
   */
  if (need_code)
    {
      gulong processed_sequence;
      gulong next_sequence;

      next_sequence = XNextRequest (display_x11->xdisplay);
      processed_sequence = XLastKnownRequestProcessed (display_x11->xdisplay);

      /* If our last request was already processed, there is no point
       * in syncing. i.e. if last request was a round trip (or even if
       * we got an event with the serial of a non-round-trip)
       */
      if ((next_sequence - 1) != processed_sequence)
        {
          XSync (display_x11->xdisplay, False);
        }

      result = trap->error_code;
    }
  else
    {
      result = Success;
    }

  /* record end of trap, giving us a range of
   * error sequences we'll ignore.
   */
  trap->end_sequence = XNextRequest (display_x11->xdisplay);

  /* remove the Xlib callback */
  _gdk_x11_error_handler_pop ();

  /* we may already be outdated */
  delete_outdated_error_traps (display_x11);

  return result;
}

/**
 * gdk_x11_display_error_trap_pop:
 * @display: the display
 *
 * Pops the error trap pushed by gdk_x11_display_error_trap_push().
 * Will XSync() if necessary and will always block until
 * the error is known to have occurred or not occurred,
 * so the error code can be returned.
 *
 * If you don't need to use the return value,
 * gdk_x11_display_error_trap_pop_ignored() would be more efficient.
 *
 * See gdk_error_trap_pop() for the all-displays-at-once
 * equivalent.
 *
 * Since: 3.0
 *
 * Return value: X error code or 0 on success
 */
gint
gdk_x11_display_error_trap_pop (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_X11_DISPLAY (display), Success);

  return gdk_x11_display_error_trap_pop_internal (display, TRUE);
}

/**
 * gdk_x11_display_error_trap_pop_ignored:
 * @display: the display
 *
 * Pops the error trap pushed by gdk_x11_display_error_trap_push().
 * Does not block to see if an error occurred; merely records the
 * range of requests to ignore errors for, and ignores those errors
 * if they arrive asynchronously.
 *
 * See gdk_error_trap_pop_ignored() for the all-displays-at-once
 * equivalent.
 *
 * Since: 3.0
 */
void
gdk_x11_display_error_trap_pop_ignored (GdkDisplay *display)
{
  g_return_if_fail (GDK_IS_X11_DISPLAY (display));

  gdk_x11_display_error_trap_pop_internal (display, FALSE);
}

extern GdkAppLaunchContext *_gdk_x11_display_get_app_launch_context (GdkDisplay *display);
extern GdkNativeWindow      _gdk_x11_display_get_drag_protocol      (GdkDisplay *display,
                                                                     GdkNativeWindow  xid,
                                                                     GdkDragProtocol *protocol,
                                                                     guint           *version);


/**
 * gdk_x11_set_sm_client_id:
 * @sm_client_id: the client id assigned by the session manager when the
 *    connection was opened, or %NULL to remove the property.
 *
 * Sets the <literal>SM_CLIENT_ID</literal> property on the application's leader window so that
 * the window manager can save the application's state using the X11R6 ICCCM
 * session management protocol.
 *
 * See the X Session Management Library documentation for more information on
 * session management and the Inter-Client Communication Conventions Manual
 *
 * Since: 2.24
 */
void
gdk_x11_set_sm_client_id (const gchar *sm_client_id)
{
 GSList *displays, *l;

  g_free (gdk_sm_client_id);
  gdk_sm_client_id = g_strdup (sm_client_id);

  displays = gdk_display_manager_list_displays (gdk_display_manager_get ());
  for (l = displays; l; l = l->next)
    set_sm_client_id (l->data, sm_client_id);

  g_slist_free (displays);
}

static void
gdk_x11_display_event_data_copy (GdkDisplay    *display,
                                const GdkEvent *src,
                                GdkEvent       *dst)
{
}

static void
gdk_x11_display_event_data_free (GdkDisplay *display,
                                 GdkEvent *event)
{
}

static gint
pop_error_trap (GdkDisplay *display,
                gboolean    ignored)
{
  if (ignored)
    {
      gdk_x11_display_error_trap_pop_ignored (display);
      return Success;
    }
  else
    {
      return gdk_x11_display_error_trap_pop (display);
    }
}

static GdkKeymap *
gdk_x11_display_get_keymap (GdkDisplay *display)
{
  GdkX11Display *display_x11;
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  display_x11 = GDK_X11_DISPLAY (display);

  if (!display_x11->keymap)
    display_x11->keymap = g_object_new (GDK_TYPE_X11_KEYMAP, NULL);

  display_x11->keymap->display = display;

  return display_x11->keymap;
}

static void
gdk_x11_display_class_init (GdkX11DisplayClass * class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);
  GdkDisplayClass *display_class = GDK_DISPLAY_CLASS (class);

  object_class->dispose = gdk_x11_display_dispose;
  object_class->finalize = gdk_x11_display_finalize;

  display_class->window_type = GDK_TYPE_X11_WINDOW;

  display_class->get_name = gdk_x11_display_get_name;
  display_class->get_n_screens = gdk_x11_display_get_n_screens;
  display_class->get_screen = gdk_x11_display_get_screen;
  display_class->get_default_screen = gdk_x11_display_get_default_screen;
  display_class->beep = gdk_x11_display_beep;
  display_class->sync = gdk_x11_display_sync;
  display_class->flush = gdk_x11_display_flush;
  display_class->has_pending = gdk_x11_display_has_pending;
  display_class->queue_events = _gdk_x11_display_queue_events;
  display_class->get_default_group = gdk_x11_display_get_default_group;
  display_class->supports_selection_notification = gdk_x11_display_supports_selection_notification;
  display_class->request_selection_notification = gdk_x11_display_request_selection_notification;
  display_class->supports_clipboard_persistence = gdk_x11_display_supports_clipboard_persistence;
  display_class->store_clipboard = gdk_x11_display_store_clipboard;
  display_class->supports_shapes = gdk_x11_display_supports_shapes;
  display_class->supports_input_shapes = gdk_x11_display_supports_input_shapes;
  display_class->supports_composite = gdk_x11_display_supports_composite;
  display_class->list_devices = gdk_x11_display_list_devices;
  display_class->send_client_message = gdk_x11_display_send_client_message;
  display_class->add_client_message_filter = gdk_x11_display_add_client_message_filter;
  display_class->get_app_launch_context = _gdk_x11_display_get_app_launch_context;
  display_class->get_drag_protocol = _gdk_x11_display_get_drag_protocol;
  display_class->get_cursor_for_type = _gdk_x11_display_get_cursor_for_type;
  display_class->get_cursor_for_name = _gdk_x11_display_get_cursor_for_name;
  display_class->get_cursor_for_pixbuf = _gdk_x11_display_get_cursor_for_pixbuf;
  display_class->get_default_cursor_size = _gdk_x11_display_get_default_cursor_size;
  display_class->get_maximal_cursor_size = _gdk_x11_display_get_maximal_cursor_size;
  display_class->supports_cursor_alpha = _gdk_x11_display_supports_cursor_alpha;
  display_class->supports_cursor_color = _gdk_x11_display_supports_cursor_color;

  display_class->before_process_all_updates = _gdk_x11_display_before_process_all_updates;
  display_class->after_process_all_updates = _gdk_x11_display_after_process_all_updates;
  display_class->get_next_serial = gdk_x11_display_get_next_serial;
  display_class->notify_startup_complete = gdk_x11_display_notify_startup_complete;
  display_class->event_data_copy = gdk_x11_display_event_data_copy;
  display_class->event_data_free = gdk_x11_display_event_data_free;
  display_class->create_window_impl = _gdk_x11_display_create_window_impl;
  display_class->get_keymap = gdk_x11_display_get_keymap;
  display_class->push_error_trap = gdk_x11_display_error_trap_push;
  display_class->pop_error_trap = pop_error_trap;
  display_class->get_selection_owner = _gdk_x11_display_get_selection_owner;
  display_class->set_selection_owner = _gdk_x11_display_set_selection_owner;
  display_class->send_selection_notify = _gdk_x11_display_send_selection_notify;
  display_class->get_selection_property = _gdk_x11_display_get_selection_property;
  display_class->convert_selection = _gdk_x11_display_convert_selection;
  display_class->text_property_to_utf8_list = _gdk_x11_display_text_property_to_utf8_list;
  display_class->utf8_to_string_target = _gdk_x11_display_utf8_to_string_target;
}