mutter-performance-source/src/core/display.c

/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/* 
 * Copyright (C) 2001 Havoc Pennington
 * Copyright (C) 2002, 2003, 2004 Red Hat, Inc.
 * Copyright (C) 2003, 2004 Rob Adams
 * Copyright (C) 2004-2006 Elijah Newren
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

/**
 * SECTION:display
 * @title: MetaDisplay
 * @short_description: Mutter X display handler
 *
 * The display is represented as a #MetaDisplay struct.
 */

#define _XOPEN_SOURCE 600 /* for gethostname() */

#include <config.h>
#include "display-private.h"
#include <meta/util.h>
#include <meta/main.h>
#include "screen-private.h"
#include "window-private.h"
#include "window-props.h"
#include "group-props.h"
#include "frame.h"
#include <meta/errors.h>
#include "keybindings-private.h"
#include <meta/prefs.h>
#include "resizepopup.h"
#include "xprops.h"
#include "workspace-private.h"
#include "bell.h"
#include <meta/compositor.h>
#include <meta/compositor-mutter.h>
#include <X11/Xatom.h>
#include <X11/cursorfont.h>
#include "mutter-enum-types.h"
#include "meta-idle-monitor-private.h"

#ifdef HAVE_RANDR
#include <X11/extensions/Xrandr.h>
#endif
#ifdef HAVE_SHAPE
#include <X11/extensions/shape.h>
#endif
#ifdef HAVE_XKB
#include <X11/XKBlib.h>
#endif
#ifdef HAVE_XCURSOR
#include <X11/Xcursor/Xcursor.h>
#endif
#include <X11/extensions/Xrender.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xdamage.h>
#include <X11/extensions/Xfixes.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define GRAB_OP_IS_WINDOW_SWITCH(g)                     \
        (g == META_GRAB_OP_KEYBOARD_TABBING_NORMAL  ||  \
         g == META_GRAB_OP_KEYBOARD_TABBING_DOCK    ||  \
         g == META_GRAB_OP_KEYBOARD_TABBING_GROUP   ||  \
         g == META_GRAB_OP_KEYBOARD_ESCAPING_NORMAL ||  \
         g == META_GRAB_OP_KEYBOARD_ESCAPING_DOCK   ||  \
         g == META_GRAB_OP_KEYBOARD_ESCAPING_GROUP)

/*
 * SECTION:pings
 *
 * Sometimes we want to see whether a window is responding,
 * so we send it a "ping" message and see whether it sends us back a "pong"
 * message within a reasonable time. Here we have a system which lets us
 * nominate one function to be called if we get the pong in time and another
 * function if we don't. The system is rather more complicated than it needs
 * to be, since we only ever use it to destroy windows which are asked to
 * close themselves and don't do so within a reasonable amount of time, and
 * therefore we always use the same callbacks. It's possible that we might
 * use it for other things in future, or on the other hand we might decide
 * that we're never going to do so and simplify it a bit.
 */

/**
 * MetaPingData:
 *
 * Describes a ping on a window. When we send a ping to a window, we build
 * one of these structs, and it eventually gets passed to the timeout function
 * or to the function which handles the response from the window. If the window
 * does or doesn't respond to the ping, we use this information to deal with
 * these facts; we have a handler function for each.
 */
typedef struct 
{
  MetaDisplay *display;
  Window       xwindow;
  guint32      timestamp;
  MetaWindowPingFunc ping_reply_func;
  MetaWindowPingFunc ping_timeout_func;
  void        *user_data;
  guint        ping_timeout_id;
} MetaPingData;

typedef struct 
{
  MetaDisplay *display;
  Window xwindow;
} MetaAutoRaiseData;

typedef struct
{
  MetaDisplay *display;
  MetaWindow *window;
  int pointer_x;
  int pointer_y;
} MetaFocusData;


G_DEFINE_TYPE(MetaDisplay, meta_display, G_TYPE_OBJECT);

/* Signals */
enum
{
  OVERLAY_KEY,
  ACCELERATOR_ACTIVATED,
  MODIFIERS_ACCELERATOR_ACTIVATED,
  FOCUS_WINDOW,
  WINDOW_CREATED,
  WINDOW_DEMANDS_ATTENTION,
  WINDOW_MARKED_URGENT,
  GRAB_OP_BEGIN,
  GRAB_OP_END,
  LAST_SIGNAL
};

enum {
  PROP_0,

  PROP_FOCUS_WINDOW
};

static guint display_signals [LAST_SIGNAL] = { 0 };

/*
 * The display we're managing.  This is a singleton object.  (Historically,
 * this was a list of displays, but there was never any way to add more
 * than one element to it.)  The goofy name is because we don't want it
 * to shadow the parameter in its object methods.
 */
static MetaDisplay *the_display = NULL;


static const char *gnome_wm_keybindings = "Mutter";
static const char *net_wm_name = "Mutter";

#ifdef WITH_VERBOSE_MODE
static void   meta_spew_event           (MetaDisplay    *display,
                                         XEvent         *event);
#endif

static gboolean event_callback          (XEvent         *event,
                                         gpointer        data);
static Window event_get_modified_window (MetaDisplay    *display,
                                         XEvent         *event);
static guint32 event_get_time           (MetaDisplay    *display,
                                         XEvent         *event);
static void    process_request_frame_extents (MetaDisplay    *display,
                                              XEvent         *event);
static void    process_pong_message     (MetaDisplay    *display,
                                         XEvent         *event);
static void    process_selection_request (MetaDisplay   *display,
                                          XEvent        *event);
static void    process_selection_clear   (MetaDisplay   *display,
                                          XEvent        *event);

static void    update_window_grab_modifiers (MetaDisplay *display);

static void    prefs_changed_callback    (MetaPreference pref,
                                          void          *data);

static void    sanity_check_timestamps   (MetaDisplay *display,
                                          guint32      known_good_timestamp);
 
MetaGroup*     get_focussed_group (MetaDisplay *display);

static void
meta_display_get_property(GObject         *object,
                          guint            prop_id,
                          GValue          *value,
                          GParamSpec      *pspec)
{
  MetaDisplay *display = META_DISPLAY (object);

  switch (prop_id)
    {
    case PROP_FOCUS_WINDOW:
      g_value_set_object (value, display->focus_window);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
meta_display_set_property(GObject         *object,
                          guint            prop_id,
                          const GValue    *value,
                          GParamSpec      *pspec)
{
  switch (prop_id)
    {
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
meta_display_class_init (MetaDisplayClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->get_property = meta_display_get_property;
  object_class->set_property = meta_display_set_property;

  display_signals[OVERLAY_KEY] =
    g_signal_new ("overlay-key",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 0);

  display_signals[ACCELERATOR_ACTIVATED] =
    g_signal_new ("accelerator-activated",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 3, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_UINT);

  /**
   * MetaDisplay::modifiers-accelerator-activated:
   * @display: the #MetaDisplay instance
   *
   * The ::modifiers-accelerator-activated signal will be emitted when
   * a special modifiers-only keybinding is activated.
   *
   * Returns: %TRUE means that the keyboard device should remain
   *    frozen and %FALSE for the default behavior of unfreezing the
   *    keyboard.
   */
  display_signals[MODIFIERS_ACCELERATOR_ACTIVATED] =
    g_signal_new ("modifiers-accelerator-activated",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  g_signal_accumulator_first_wins, NULL, NULL,
                  G_TYPE_BOOLEAN, 0);

  display_signals[WINDOW_CREATED] =
    g_signal_new ("window-created",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 1, META_TYPE_WINDOW);

  display_signals[WINDOW_DEMANDS_ATTENTION] =
    g_signal_new ("window-demands-attention",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 1, META_TYPE_WINDOW);

  display_signals[WINDOW_MARKED_URGENT] =
    g_signal_new ("window-marked-urgent",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 1,
                  META_TYPE_WINDOW);

  display_signals[GRAB_OP_BEGIN] =
    g_signal_new ("grab-op-begin",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 3,
                  META_TYPE_SCREEN,
                  META_TYPE_WINDOW,
                  META_TYPE_GRAB_OP);

  display_signals[GRAB_OP_END] =
    g_signal_new ("grab-op-end",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 3,
                  META_TYPE_SCREEN,
                  META_TYPE_WINDOW,
                  META_TYPE_GRAB_OP);

  g_object_class_install_property (object_class,
                                   PROP_FOCUS_WINDOW,
                                   g_param_spec_object ("focus-window",
                                                        "Focus window",
                                                        "Currently focused window",
                                                        META_TYPE_WINDOW,
                                                        G_PARAM_READABLE));
}


/**
 * ping_data_free:
 *
 * Destructor for #MetaPingData structs. Will destroy the
 * event source for the struct as well.
 */
static void
ping_data_free (MetaPingData *ping_data)
{
  /* Remove the timeout */
  if (ping_data->ping_timeout_id != 0)
    g_source_remove (ping_data->ping_timeout_id);

  g_free (ping_data);
}

/**
 * remove_pending_pings_for_window:
 * @display: The display the window appears on
 * @xwindow: The X ID of the window whose pings we should remove
 *
 * Frees every pending ping structure for the given X window on the
 * given display. This means that we also destroy the timeouts.
 */
static void
remove_pending_pings_for_window (MetaDisplay *display, Window xwindow)
{
  GSList *tmp;
  GSList *dead;

  /* could obviously be more efficient, don't care */
  
  /* build list to be removed */
  dead = NULL;
  for (tmp = display->pending_pings; tmp; tmp = tmp->next)
    {
      MetaPingData *ping_data = tmp->data;

      if (ping_data->xwindow == xwindow)
        dead = g_slist_prepend (dead, ping_data);
    }

  /* remove what we found */
  for (tmp = dead; tmp; tmp = tmp->next)
    {
      MetaPingData *ping_data = tmp->data;

      display->pending_pings = g_slist_remove (display->pending_pings, ping_data);
      ping_data_free (ping_data);
    }

  g_slist_free (dead);
}


#ifdef HAVE_STARTUP_NOTIFICATION
static void
sn_error_trap_push (SnDisplay *sn_display,
                    Display   *xdisplay)
{
  MetaDisplay *display;
  display = meta_display_for_x_display (xdisplay);
  if (display != NULL)
    meta_error_trap_push (display);
}

static void
sn_error_trap_pop (SnDisplay *sn_display,
                   Display   *xdisplay)
{
  MetaDisplay *display;
  display = meta_display_for_x_display (xdisplay);
  if (display != NULL)
    meta_error_trap_pop (display);
}
#endif

static void
enable_compositor (MetaDisplay *display)
{
  GSList *list;

  if (!META_DISPLAY_HAS_COMPOSITE (display) ||
      !META_DISPLAY_HAS_DAMAGE (display) ||
      !META_DISPLAY_HAS_RENDER (display))
    {
      meta_warning (_("Missing %s extension required for compositing"),
                    !META_DISPLAY_HAS_COMPOSITE (display) ? "composite" :
                    !META_DISPLAY_HAS_DAMAGE (display) ? "damage" : "render");
      return;
    }

  if (!display->compositor)
      display->compositor = meta_compositor_new (display);

  if (!display->compositor)
    return;
  
  for (list = display->screens; list != NULL; list = list->next)
    {
      MetaScreen *screen = list->data;
      
      meta_compositor_manage_screen (screen->display->compositor,
				     screen);
    }
}

static void
meta_display_init (MetaDisplay *disp)
{
  /* Some stuff could go in here that's currently in _open,
   * but it doesn't really matter. */
}

/**
 * meta_set_wm_name: (skip)
 * @wm_name: value for _NET_WM_NAME
 *
 * Set the value to use for the _NET_WM_NAME property. To take effect,
 * it is necessary to call this function before meta_init().
 */
void
meta_set_wm_name (const char *wm_name)
{
  g_return_if_fail (the_display == NULL);

  net_wm_name = wm_name;
}

/**
 * meta_set_gnome_wm_keybindings: (skip)
 * @wm_keybindings: value for _GNOME_WM_KEYBINDINGS
 *
 * Set the value to use for the _GNOME_WM_KEYBINDINGS property. To take
 * effect, it is necessary to call this function before meta_init().
 */
void
meta_set_gnome_wm_keybindings (const char *wm_keybindings)
{
  g_return_if_fail (the_display == NULL);

  gnome_wm_keybindings = wm_keybindings;
}

/**
 * meta_display_open:
 *
 * Opens a new display, sets it up, initialises all the X extensions
 * we will need, and adds it to the list of displays.
 *
 * Returns: %TRUE if the display was opened successfully, and %FALSE
 * otherwise-- that is, if the display doesn't exist or it already
 * has a window manager.
 */
gboolean
meta_display_open (void)
{
  Display *xdisplay;
  GSList *screens;
  MetaScreen *screen;
  GSList *tmp;
  int i;
  guint32 timestamp;

  /* A list of all atom names, so that we can intern them in one go. */
  char *atom_names[] = {
#define item(x) #x,
#include <meta/atomnames.h>
#undef item
  };
  Atom atoms[G_N_ELEMENTS(atom_names)];
  
  meta_verbose ("Opening display '%s'\n", XDisplayName (NULL));

  xdisplay = meta_ui_get_display ();
  
  if (xdisplay == NULL)
    {
      meta_warning (_("Failed to open X Window System display '%s'\n"),
		    XDisplayName (NULL));
      return FALSE;
    }

  if (meta_is_syncing ())
    XSynchronize (xdisplay, True);
  
  g_assert (the_display == NULL);
  the_display = g_object_new (META_TYPE_DISPLAY, NULL);

  the_display->closing = 0;
  
  /* here we use XDisplayName which is what the user
   * probably put in, vs. DisplayString(display) which is
   * canonicalized by XOpenDisplay()
   */
  the_display->name = g_strdup (XDisplayName (NULL));
  the_display->xdisplay = xdisplay;
  the_display->error_trap_synced_at_last_pop = TRUE;
  the_display->error_traps = 0;
  the_display->error_trap_handler = NULL;
  the_display->server_grab_count = 0;
  the_display->display_opening = TRUE;

  the_display->pending_pings = NULL;
  the_display->autoraise_timeout_id = 0;
  the_display->autoraise_window = NULL;
  the_display->focus_window = NULL;
  the_display->focus_serial = 0;
  the_display->server_focus_window = None;
  the_display->server_focus_serial = 0;
  the_display->grab_old_window_stacking = NULL;

  the_display->mouse_mode = TRUE; /* Only relevant for mouse or sloppy focus */
  the_display->allow_terminal_deactivation = TRUE; /* Only relevant for when a
                                                  terminal has the focus */

  /* FIXME copy the checks from GDK probably */
  the_display->static_gravity_works = g_getenv ("MUTTER_USE_STATIC_GRAVITY") != NULL;
  
  meta_bell_init (the_display);

  meta_display_init_keys (the_display);

  update_window_grab_modifiers (the_display);

  meta_prefs_add_listener (prefs_changed_callback, the_display);

  meta_verbose ("Creating %d atoms\n", (int) G_N_ELEMENTS (atom_names));
  XInternAtoms (the_display->xdisplay, atom_names, G_N_ELEMENTS (atom_names),
                False, atoms);
  {
    int i = 0;    
#define item(x) the_display->atom_##x = atoms[i++];
#include <meta/atomnames.h>
#undef item
  }

  the_display->prop_hooks = NULL;
  meta_display_init_window_prop_hooks (the_display);
  the_display->group_prop_hooks = NULL;
  meta_display_init_group_prop_hooks (the_display);
  
  /* Offscreen unmapped window used for _NET_SUPPORTING_WM_CHECK,
   * created in screen_new
   */
  the_display->leader_window = None;
  the_display->timestamp_pinging_window = None;

  the_display->monitor_cache_invalidated = TRUE;

  the_display->groups_by_leader = NULL;

  the_display->window_with_menu = NULL;
  the_display->window_menu = NULL;
  
  the_display->screens = NULL;
  the_display->active_screen = NULL;
  
#ifdef HAVE_STARTUP_NOTIFICATION
  the_display->sn_display = sn_display_new (the_display->xdisplay,
                                        sn_error_trap_push,
                                        sn_error_trap_pop);
#endif

  /* Get events */
  meta_ui_add_event_func (the_display->xdisplay,
                          event_callback,
                          the_display);
  
  the_display->xids = g_hash_table_new (meta_unsigned_long_hash,
                                        meta_unsigned_long_equal);

  i = 0;
  while (i < N_IGNORED_CROSSING_SERIALS)
    {
      the_display->ignored_crossing_serials[i] = 0;
      ++i;
    }
  the_display->ungrab_should_not_cause_focus_window = None;
  
  the_display->current_time = CurrentTime;
  the_display->sentinel_counter = 0;

  the_display->grab_resize_timeout_id = 0;
  the_display->grab_have_keyboard = FALSE;
  
#ifdef HAVE_XKB  
  the_display->last_bell_time = 0;
#endif

  the_display->grab_op = META_GRAB_OP_NONE;
  the_display->grab_window = NULL;
  the_display->grab_screen = NULL;
  the_display->grab_resize_popup = NULL;
  the_display->grab_tile_mode = META_TILE_NONE;
  the_display->grab_tile_monitor_number = -1;

  the_display->grab_edge_resistance_data = NULL;

#ifdef HAVE_XSYNC
  {
    int major, minor;

    the_display->have_xsync = FALSE;
    
    the_display->xsync_error_base = 0;
    the_display->xsync_event_base = 0;

    /* I don't think we really have to fill these in */
    major = SYNC_MAJOR_VERSION;
    minor = SYNC_MINOR_VERSION;
    
    if (!XSyncQueryExtension (the_display->xdisplay,
                              &the_display->xsync_event_base,
                              &the_display->xsync_error_base) ||
        !XSyncInitialize (the_display->xdisplay,
                          &major, &minor))
      {
        the_display->xsync_error_base = 0;
        the_display->xsync_event_base = 0;
      }
    else
      {
        the_display->have_xsync = TRUE;
        XSyncSetPriority (the_display->xdisplay, None, 10);
      }

    meta_verbose ("Attempted to init Xsync, found version %d.%d error base %d event base %d\n",
                  major, minor,
                  the_display->xsync_error_base,
                  the_display->xsync_event_base);
  }
#else  /* HAVE_XSYNC */
  meta_verbose ("Not compiled with Xsync support\n");
#endif /* !HAVE_XSYNC */


#ifdef HAVE_SHAPE
  {
    the_display->have_shape = FALSE;
    
    the_display->shape_error_base = 0;
    the_display->shape_event_base = 0;
    
    if (!XShapeQueryExtension (the_display->xdisplay,
                               &the_display->shape_event_base,
                               &the_display->shape_error_base))
      {
        the_display->shape_error_base = 0;
        the_display->shape_event_base = 0;
      }
    else
      the_display->have_shape = TRUE;
    
    meta_verbose ("Attempted to init Shape, found error base %d event base %d\n",
                  the_display->shape_error_base,
                  the_display->shape_event_base);
  }
#else  /* HAVE_SHAPE */
  meta_verbose ("Not compiled with Shape support\n");
#endif /* !HAVE_SHAPE */

  {
    the_display->have_render = FALSE;
    
    the_display->render_error_base = 0;
    the_display->render_event_base = 0;
    
    if (!XRenderQueryExtension (the_display->xdisplay,
                                &the_display->render_event_base,
                                &the_display->render_error_base))
      {
        the_display->render_error_base = 0;
        the_display->render_event_base = 0;
      }
    else
      the_display->have_render = TRUE;
    
    meta_verbose ("Attempted to init Render, found error base %d event base %d\n",
                  the_display->render_error_base,
                  the_display->render_event_base);
  }

  {
    the_display->have_composite = FALSE;

    the_display->composite_error_base = 0;
    the_display->composite_event_base = 0;

    if (!XCompositeQueryExtension (the_display->xdisplay,
                                   &the_display->composite_event_base,
                                   &the_display->composite_error_base))
      {
        the_display->composite_error_base = 0;
        the_display->composite_event_base = 0;
      } 
    else
      {
        the_display->composite_major_version = 0;
        the_display->composite_minor_version = 0;
        if (XCompositeQueryVersion (the_display->xdisplay,
                                    &the_display->composite_major_version,
                                    &the_display->composite_minor_version))
          {
            the_display->have_composite = TRUE;
          }
        else
          {
            the_display->composite_major_version = 0;
            the_display->composite_minor_version = 0;
          }
      }

    meta_verbose ("Attempted to init Composite, found error base %d event base %d "
                  "extn ver %d %d\n",
                  the_display->composite_error_base, 
                  the_display->composite_event_base,
                  the_display->composite_major_version,
                  the_display->composite_minor_version);

    the_display->have_damage = FALSE;

    the_display->damage_error_base = 0;
    the_display->damage_event_base = 0;

    if (!XDamageQueryExtension (the_display->xdisplay,
                                &the_display->damage_event_base,
                                &the_display->damage_error_base))
      {
        the_display->damage_error_base = 0;
        the_display->damage_event_base = 0;
      } 
    else
      the_display->have_damage = TRUE;

    meta_verbose ("Attempted to init Damage, found error base %d event base %d\n",
                  the_display->damage_error_base, 
                  the_display->damage_event_base);

    the_display->xfixes_error_base = 0;
    the_display->xfixes_event_base = 0;

    if (XFixesQueryExtension (the_display->xdisplay,
                              &the_display->xfixes_event_base,
                              &the_display->xfixes_error_base))
      {
        int xfixes_major, xfixes_minor;

        XFixesQueryVersion (the_display->xdisplay, &xfixes_major, &xfixes_minor);

        if (xfixes_major * 100 + xfixes_minor < 500)
          meta_fatal ("Mutter requires XFixes 5.0");
      }
    else
      {
        meta_fatal ("Mutter requires XFixes 5.0");
      }

    meta_verbose ("Attempted to init XFixes, found error base %d event base %d\n",
                  the_display->xfixes_error_base, 
                  the_display->xfixes_event_base);
  }

  {
    int major = 2, minor = 3;
    gboolean has_xi = FALSE;

    if (XQueryExtension (the_display->xdisplay,
                         "XInputExtension",
                         &the_display->xinput_opcode,
                         &the_display->xinput_error_base,
                         &the_display->xinput_event_base))
      {
        if (XIQueryVersion (the_display->xdisplay, &major, &minor) == Success)
          {
            int version = (major * 10) + minor;
            if (version >= 22)
              has_xi = TRUE;

#ifdef HAVE_XI23
            if (version >= 23)
              the_display->have_xinput_23 = TRUE;
#endif /* HAVE_XI23 */
          }
      }

    if (!has_xi)
      meta_fatal ("X server doesn't have the XInput extension, version 2.2 or newer\n");
  }

#ifdef HAVE_XCURSOR
  {
    XcursorSetTheme (the_display->xdisplay, meta_prefs_get_cursor_theme ());
    XcursorSetDefaultSize (the_display->xdisplay, meta_prefs_get_cursor_size ());
  }
#else /* HAVE_XCURSOR */
  meta_verbose ("Not compiled with Xcursor support\n");
#endif /* !HAVE_XCURSOR */

  /* Create the leader window here. Set its properties and
   * use the timestamp from one of the PropertyNotify events
   * that will follow.
   */
  {
    gulong data[1];
    XEvent event;

    /* We only care about the PropertyChangeMask in the next 30 or so lines of
     * code.  Note that gdk will at some point unset the PropertyChangeMask for
     * this window, so we can't rely on it still being set later.  See bug
     * 354213 for details.
     */
    the_display->leader_window =
      meta_create_offscreen_window (the_display->xdisplay,
                                    DefaultRootWindow (the_display->xdisplay),
                                    PropertyChangeMask);

    meta_prop_set_utf8_string_hint (the_display,
                                    the_display->leader_window,
                                    the_display->atom__NET_WM_NAME,
                                    net_wm_name);

    meta_prop_set_utf8_string_hint (the_display,
                                    the_display->leader_window,
                                    the_display->atom__GNOME_WM_KEYBINDINGS,
                                    gnome_wm_keybindings);
    
    meta_prop_set_utf8_string_hint (the_display,
                                    the_display->leader_window,
                                    the_display->atom__MUTTER_VERSION,
                                    VERSION);

    data[0] = the_display->leader_window;
    XChangeProperty (the_display->xdisplay,
                     the_display->leader_window,
                     the_display->atom__NET_SUPPORTING_WM_CHECK,
                     XA_WINDOW,
                     32, PropModeReplace, (guchar*) data, 1);

    XWindowEvent (the_display->xdisplay,
                  the_display->leader_window,
                  PropertyChangeMask,
                  &event);

    timestamp = event.xproperty.time;

    /* Make it painfully clear that we can't rely on PropertyNotify events on
     * this window, as per bug 354213.
     */
    XSelectInput(the_display->xdisplay,
                 the_display->leader_window,
                 NoEventMask);
  }

  /* Make a little window used only for pinging the server for timestamps; note
   * that meta_create_offscreen_window already selects for PropertyChangeMask.
   */
  the_display->timestamp_pinging_window =
    meta_create_offscreen_window (the_display->xdisplay,
                                  DefaultRootWindow (the_display->xdisplay),
                                  PropertyChangeMask);

  the_display->last_focus_time = timestamp;
  the_display->last_user_time = timestamp;
  the_display->compositor = NULL;
  
  /* Mutter used to manage all X screens of the display in a single process, but
   * now it always manages exactly one screen as specified by the DISPLAY
   * environment variable. The screens GSList is left for simplicity.
   */
  screens = NULL;

  i = meta_ui_get_screen_number ();

  screen = meta_screen_new (the_display, i, timestamp);

  if (screen)
    screens = g_slist_prepend (screens, screen);
  
  the_display->screens = screens;
  
  if (screens == NULL)
    {
      /* This would typically happen because all the screens already
       * have window managers.
       */
      meta_display_close (the_display, timestamp);
      return FALSE;
    }

  enable_compositor (the_display);
   
  meta_display_grab (the_display);
  
  /* Now manage all existing windows */
  tmp = the_display->screens;
  while (tmp != NULL)
    {
      MetaScreen *screen = tmp->data;

      if (meta_is_wayland_compositor ())
        {
          /* Instead of explicitly enumerating all windows during
           * initialization, when we run as a wayland compositor we can rely on
           * xwayland notifying us of all top level windows so we create
           * MetaWindows when we get those notifications.
           *
           * We still want a guard window so we can avoid
           * unmapping/withdrawing minimized windows for live
           * thumbnails...
           */
          if (screen->guard_window == None)
            screen->guard_window =
              meta_screen_create_guard_window (screen->display->xdisplay, screen);
        }
      else
        meta_screen_manage_all_windows (screen);

      tmp = tmp->next;
    }

  {
    Window focus;
    int ret_to;

    /* kinda bogus because GetInputFocus has no possible errors */
    meta_error_trap_push (the_display);

    /* FIXME: This is totally broken; see comment 9 of bug 88194 about this */
    focus = None;
    ret_to = RevertToPointerRoot;
    XGetInputFocus (the_display->xdisplay, &focus, &ret_to);

    /* Force a new FocusIn (does this work?) */

    /* Use the same timestamp that was passed to meta_screen_new(),
     * as it is the most recent timestamp.
     */
    if (focus == None || focus == PointerRoot)
      /* Just focus the no_focus_window on the first screen */
      meta_display_focus_the_no_focus_window (the_display,
                                              the_display->screens->data,
                                              timestamp);
    else
      {
        MetaWindow * window;
        window  = meta_display_lookup_x_window (the_display, focus);
        if (window)
          meta_display_set_input_focus_window (the_display, window, FALSE, timestamp);
        else
          /* Just focus the no_focus_window on the first screen */
          meta_display_focus_the_no_focus_window (the_display,
                                                  the_display->screens->data,
                                                  timestamp);
      }

    meta_error_trap_pop (the_display);
  }
  
  meta_display_ungrab (the_display);  

  /* Done opening new display */
  the_display->display_opening = FALSE;

  return TRUE;
}

static gint
ptrcmp (gconstpointer a, gconstpointer b)
{
  if (a < b)
    return -1;
  else if (a > b)
    return 1;
  else
    return 0;
}

/**
 * meta_display_list_windows:
 * @display: a #MetaDisplay
 * @flags: options for listing
 *
 * Lists windows for the display, the @flags parameter for
 * now determines whether override-redirect windows will be
 * included.
 *
 * Return value: (transfer container): the list of windows.
 */
GSList*
meta_display_list_windows (MetaDisplay          *display,
                           MetaListWindowsFlags  flags)
{
  GSList *winlist;
  GSList *tmp;
  GSList *prev;
  GHashTableIter iter;
  gpointer key, value;

  winlist = NULL;

  g_hash_table_iter_init (&iter, display->xids);
  while (g_hash_table_iter_next (&iter, &key, &value))
    {
      MetaWindow *window = value;

      if (!META_IS_WINDOW (window))
        continue;

      if (!window->override_redirect ||
          (flags & META_LIST_INCLUDE_OVERRIDE_REDIRECT) != 0)
        winlist = g_slist_prepend (winlist, window);
    }

  /* Uniquify the list, since both frame windows and plain
   * windows are in the hash
   */
  winlist = g_slist_sort (winlist, ptrcmp);

  prev = NULL;
  tmp = winlist;
  while (tmp != NULL)
    {
      GSList *next;

      next = tmp->next;
      
      if (next &&
          next->data == tmp->data)
        {
          /* Delete tmp from list */

          if (prev)
            prev->next = next;

          if (tmp == winlist)
            winlist = next;
          
          g_slist_free_1 (tmp);

          /* leave prev unchanged */
        }
      else
        {
          prev = tmp;
        }
      
      tmp = next;
    }

  return winlist;
}

void
meta_display_close (MetaDisplay *display,
                    guint32      timestamp)
{
  GSList *tmp;

  g_assert (display != NULL);

  if (display->closing != 0)
    {
      /* The display's already been closed. */
      return;
    }

  if (display->error_traps > 0)
    meta_bug ("Display closed with error traps pending\n");

  display->closing += 1;

  meta_prefs_remove_listener (prefs_changed_callback, display);
  
  meta_display_remove_autoraise_callback (display);

  if (display->focus_timeout_id)
    g_source_remove (display->focus_timeout_id);
  display->focus_timeout_id = 0;

  if (display->grab_old_window_stacking)
    g_list_free (display->grab_old_window_stacking);
  
  /* Stop caring about events */
  meta_ui_remove_event_func (display->xdisplay,
                             event_callback,
                             display);
  
  /* Free all screens */
  tmp = display->screens;
  while (tmp != NULL)
    {
      MetaScreen *screen = tmp->data;
      meta_screen_free (screen, timestamp);
      tmp = tmp->next;
    }

  g_slist_free (display->screens);
  display->screens = NULL;

#ifdef HAVE_STARTUP_NOTIFICATION
  if (display->sn_display)
    {
      sn_display_unref (display->sn_display);
      display->sn_display = NULL;
    }
#endif
  
  /* Must be after all calls to meta_window_unmanage() since they
   * unregister windows
   */
  g_hash_table_destroy (display->xids);

  if (display->leader_window != None)
    XDestroyWindow (display->xdisplay, display->leader_window);

  XFlush (display->xdisplay);

  meta_display_free_window_prop_hooks (display);
  meta_display_free_group_prop_hooks (display);
  
  g_free (display->name);

  meta_display_shutdown_keys (display);

  if (display->compositor)
    meta_compositor_destroy (display->compositor);
  
  g_object_unref (display);
  the_display = NULL;

  meta_quit (META_EXIT_SUCCESS);
}

/**
 * meta_display_screen_for_root:
 * @display: a #MetaDisplay
 * @xroot: a X window
 *
 * Return the #MetaScreen corresponding to a specified X root window ID.
 *
 * Return Value: (transfer none): the screen for the specified root window ID, or %NULL
 */
MetaScreen*
meta_display_screen_for_root (MetaDisplay *display,
                              Window       xroot)
{
  GSList *tmp;

  tmp = display->screens;
  while (tmp != NULL)
    {
      MetaScreen *screen = tmp->data;

      if (xroot == screen->xroot)
        return screen;

      tmp = tmp->next;
    }

  return NULL;
}

MetaScreen*
meta_display_screen_for_xwindow (MetaDisplay *display,
                                 Window       xwindow)
{
  XWindowAttributes attr;
  int result;
  
  meta_error_trap_push (display);
  attr.screen = NULL;
  result = XGetWindowAttributes (display->xdisplay, xwindow, &attr);
  meta_error_trap_pop (display);

  /* Note, XGetWindowAttributes is on all kinds of crack
   * and returns 1 on success 0 on failure, rather than Success
   * on success.
   */
  if (result == 0 || attr.screen == NULL)
    return NULL;
  
  return meta_display_screen_for_x_screen (display, attr.screen);
}

MetaScreen*
meta_display_screen_for_x_screen (MetaDisplay *display,
                                  Screen      *xscreen)
{
  GSList *tmp;

  tmp = display->screens;
  while (tmp != NULL)
    {
      MetaScreen *screen = tmp->data;

      if (xscreen == screen->xscreen)
        return screen;

      tmp = tmp->next;
    }

  return NULL;
}

/* Grab/ungrab routines taken from fvwm */
void
meta_display_grab (MetaDisplay *display)
{
  if (display->server_grab_count == 0)
    {
      XGrabServer (display->xdisplay);
    }
  display->server_grab_count += 1;
  meta_verbose ("Grabbing display, grab count now %d\n",
                display->server_grab_count);
}

void
meta_display_ungrab (MetaDisplay *display)
{
  if (display->server_grab_count == 0)
    meta_bug ("Ungrabbed non-grabbed server\n");
  
  display->server_grab_count -= 1;
  if (display->server_grab_count == 0)
    {
      /* FIXME we want to purge all pending "queued" stuff
       * at this point, such as window hide/show
       */
      XUngrabServer (display->xdisplay);
      XFlush (display->xdisplay);
    }

  meta_verbose ("Ungrabbing display, grab count now %d\n",
                display->server_grab_count);
}

/**
 * meta_display_for_x_display:
 * @xdisplay: An X display
 *
 * Returns the singleton MetaDisplay if @xdisplay matches the X display it's
 * managing; otherwise gives a warning and returns %NULL.  When we were claiming
 * to be able to manage multiple displays, this was supposed to find the
 * display out of the list which matched that display.  Now it's merely an
 * extra sanity check.
 *
 * Returns: The singleton X display, or %NULL if @xdisplay isn't the one
 *          we're managing.
 */
MetaDisplay*
meta_display_for_x_display (Display *xdisplay)
{
  if (the_display->xdisplay == xdisplay)
    return the_display;

  meta_warning ("Could not find display for X display %p, probably going to crash\n",
                xdisplay);
  
  return NULL;
}

/**
 * meta_get_display:
 *
 * Accessor for the singleton MetaDisplay.
 *
 * Returns: The only #MetaDisplay there is.  This can be %NULL, but only
 *          during startup.
 */
MetaDisplay*
meta_get_display (void)
{
  return the_display;
}

#ifdef WITH_VERBOSE_MODE
static gboolean dump_events = TRUE;
#endif

static gboolean
grab_op_is_mouse_only (MetaGrabOp op)
{
  switch (op)
    {
    case META_GRAB_OP_MOVING:
    case META_GRAB_OP_RESIZING_SE:
    case META_GRAB_OP_RESIZING_S:      
    case META_GRAB_OP_RESIZING_SW:      
    case META_GRAB_OP_RESIZING_N:
    case META_GRAB_OP_RESIZING_NE:
    case META_GRAB_OP_RESIZING_NW:
    case META_GRAB_OP_RESIZING_W:
    case META_GRAB_OP_RESIZING_E:
      return TRUE;

    default:
      return FALSE;
    }
}

gboolean
meta_grab_op_is_mouse (MetaGrabOp op)
{
  switch (op)
    {
    case META_GRAB_OP_MOVING:
    case META_GRAB_OP_RESIZING_SE:
    case META_GRAB_OP_RESIZING_S:      
    case META_GRAB_OP_RESIZING_SW:      
    case META_GRAB_OP_RESIZING_N:
    case META_GRAB_OP_RESIZING_NE:
    case META_GRAB_OP_RESIZING_NW:
    case META_GRAB_OP_RESIZING_W:
    case META_GRAB_OP_RESIZING_E:
    case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
    case META_GRAB_OP_KEYBOARD_RESIZING_S:
    case META_GRAB_OP_KEYBOARD_RESIZING_N:
    case META_GRAB_OP_KEYBOARD_RESIZING_W:
    case META_GRAB_OP_KEYBOARD_RESIZING_E:
    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
    case META_GRAB_OP_KEYBOARD_MOVING:
    case META_GRAB_OP_COMPOSITOR:
      return TRUE;

    default:
      return FALSE;
    }
}

static gboolean
grab_op_is_keyboard (MetaGrabOp op)
{
  switch (op)
    {
    case META_GRAB_OP_KEYBOARD_MOVING:
    case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
    case META_GRAB_OP_KEYBOARD_RESIZING_S:
    case META_GRAB_OP_KEYBOARD_RESIZING_N:
    case META_GRAB_OP_KEYBOARD_RESIZING_W:
    case META_GRAB_OP_KEYBOARD_RESIZING_E:
    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
    case META_GRAB_OP_KEYBOARD_TABBING_NORMAL:
    case META_GRAB_OP_KEYBOARD_TABBING_DOCK:
    case META_GRAB_OP_KEYBOARD_TABBING_GROUP:
    case META_GRAB_OP_KEYBOARD_ESCAPING_NORMAL:
    case META_GRAB_OP_KEYBOARD_ESCAPING_DOCK:
    case META_GRAB_OP_KEYBOARD_ESCAPING_GROUP:
    case META_GRAB_OP_KEYBOARD_WORKSPACE_SWITCHING:
    case META_GRAB_OP_COMPOSITOR:
      return TRUE;

    default:
      return FALSE;
    }
}

gboolean
meta_grab_op_is_resizing (MetaGrabOp op)
{
  switch (op)
    {
    case META_GRAB_OP_RESIZING_SE:
    case META_GRAB_OP_RESIZING_S:      
    case META_GRAB_OP_RESIZING_SW:      
    case META_GRAB_OP_RESIZING_N:
    case META_GRAB_OP_RESIZING_NE:
    case META_GRAB_OP_RESIZING_NW:
    case META_GRAB_OP_RESIZING_W:
    case META_GRAB_OP_RESIZING_E:
    case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
    case META_GRAB_OP_KEYBOARD_RESIZING_S:
    case META_GRAB_OP_KEYBOARD_RESIZING_N:
    case META_GRAB_OP_KEYBOARD_RESIZING_W:
    case META_GRAB_OP_KEYBOARD_RESIZING_E:
    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
      return TRUE;

    default:
      return FALSE;
    }
}

gboolean
meta_grab_op_is_moving (MetaGrabOp op)
{
  switch (op)
    {
    case META_GRAB_OP_MOVING:
    case META_GRAB_OP_KEYBOARD_MOVING:
      return TRUE;
      
    default:
      return FALSE;
    }
}

/**
 * meta_display_xserver_time_is_before:
 * @display: a #MetaDisplay
 * @time1: An event timestamp
 * @time2: An event timestamp
 *
 * Xserver time can wraparound, thus comparing two timestamps needs to take
 * this into account. If no wraparound has occurred, this is equivalent to
 *   time1 < time2
 * Otherwise, we need to account for the fact that wraparound can occur
 * and the fact that a timestamp of 0 must be special-cased since it
 * means "older than anything else".
 *
 * Note that this is NOT an equivalent for time1 <= time2; if that's what
 * you need then you'll need to swap the order of the arguments and negate
 * the result.
 */
gboolean
meta_display_xserver_time_is_before (MetaDisplay   *display,
                                     guint32        time1,
                                     guint32        time2)
{
  return XSERVER_TIME_IS_BEFORE(time1, time2);
}

/**
 * meta_display_get_last_user_time:
 * @display: a #MetaDisplay
 *
 * Returns: Timestamp of the last user interaction event with a window
 */
guint32
meta_display_get_last_user_time (MetaDisplay *display)
{
  return display->last_user_time;
}

/* Get time of current event, or CurrentTime if none. */
guint32
meta_display_get_current_time (MetaDisplay *display)
{
  return display->current_time;
}

static Bool
find_timestamp_predicate (Display  *xdisplay,
                          XEvent   *ev,
                          XPointer  arg)
{
  MetaDisplay *display = (MetaDisplay *) arg;

  return (ev->type == PropertyNotify &&
          ev->xproperty.atom == display->atom__MUTTER_TIMESTAMP_PING);
}

/* Get a timestamp, even if it means a roundtrip */
guint32
meta_display_get_current_time_roundtrip (MetaDisplay *display)
{
  guint32 timestamp;
  
  timestamp = meta_display_get_current_time (display);
  if (timestamp == CurrentTime)
    {
      XEvent property_event;

      XChangeProperty (display->xdisplay, display->timestamp_pinging_window,
                       display->atom__MUTTER_TIMESTAMP_PING,
                       XA_STRING, 8, PropModeAppend, NULL, 0);
      XIfEvent (display->xdisplay,
                &property_event,
                find_timestamp_predicate,
                (XPointer) display);
      timestamp = property_event.xproperty.time;
    }

  sanity_check_timestamps (display, timestamp);

  return timestamp;
}

/**
 * meta_display_get_ignored_modifier_mask:
 * @display: a #MetaDisplay
 *
 * Returns: a mask of modifiers that should be ignored
 *          when matching keybindings to events
 */
unsigned int
meta_display_get_ignored_modifier_mask (MetaDisplay *display)
{
  return display->ignored_modifier_mask;
}

/**
 * meta_display_add_ignored_crossing_serial:
 * @display: a #MetaDisplay
 * @serial: the serial to ignore
 *
 * Save the specified serial and ignore crossing events with that
 * serial for the purpose of focus-follows-mouse. This can be used
 * for certain changes to the window hierarchy that we don't want
 * to change the focus window, even if they cause the pointer to
 * end up in a new window.
 */
void
meta_display_add_ignored_crossing_serial (MetaDisplay  *display,
                                          unsigned long serial)
{
  int i;

  /* don't add the same serial more than once */
  if (display->ignored_crossing_serials[N_IGNORED_CROSSING_SERIALS-1] == serial)
    return;
  
  /* shift serials to the left */
  i = 0;
  while (i < (N_IGNORED_CROSSING_SERIALS - 1))
    {
      display->ignored_crossing_serials[i] = display->ignored_crossing_serials[i+1];
      ++i;
    }
  /* put new one on the end */
  display->ignored_crossing_serials[i] = serial;
}

static gboolean
crossing_serial_is_ignored (MetaDisplay  *display,
                            unsigned long serial)
{
  int i;

  i = 0;
  while (i < N_IGNORED_CROSSING_SERIALS)
    {
      if (display->ignored_crossing_serials[i] == serial)
        return TRUE;
      ++i;
    }
  return FALSE;
}

static void
reset_ignored_crossing_serials (MetaDisplay *display)
{
  int i;

  i = 0;
  while (i < N_IGNORED_CROSSING_SERIALS)
    {
      display->ignored_crossing_serials[i] = 0;
      ++i;
    }

  display->ungrab_should_not_cause_focus_window = None;
}

static gboolean 
window_raise_with_delay_callback (void *data)
{
  MetaWindow *window;
  MetaAutoRaiseData *auto_raise;

  auto_raise = data;

  meta_topic (META_DEBUG_FOCUS, 
	      "In autoraise callback for window 0x%lx\n", 
	      auto_raise->xwindow);

  auto_raise->display->autoraise_timeout_id = 0;
  auto_raise->display->autoraise_window = NULL;

  window  = meta_display_lookup_x_window (auto_raise->display, 
					  auto_raise->xwindow);
  
  if (window == NULL) 
    return FALSE;

  /* If we aren't already on top, check whether the pointer is inside
   * the window and raise the window if so.
   */      
  if (meta_stack_get_top (window->screen->stack) != window) 
    {
      int x, y, root_x, root_y;
      Window root, child;
      unsigned int mask;
      gboolean same_screen;
      gboolean point_in_window;

      meta_error_trap_push (window->display);
      same_screen = XQueryPointer (window->display->xdisplay,
				   window->xwindow,
				   &root, &child,
				   &root_x, &root_y, &x, &y, &mask);
      meta_error_trap_pop (window->display);

      point_in_window = 
        (window->frame && POINT_IN_RECT (root_x, root_y, window->frame->rect)) ||
        (window->frame == NULL && POINT_IN_RECT (root_x, root_y, window->rect));
      if (same_screen && point_in_window)
	meta_window_raise (window);
      else
	meta_topic (META_DEBUG_FOCUS, 
		    "Pointer not inside window, not raising %s\n", 
		    window->desc);
    }

  return FALSE;
}

static void
meta_display_mouse_mode_focus (MetaDisplay *display,
                               MetaWindow  *window,
                               guint32      timestamp) {
  if (window->type != META_WINDOW_DESKTOP)
    {
      meta_topic (META_DEBUG_FOCUS,
                  "Focusing %s at time %u.\n", window->desc, timestamp);

      meta_window_focus (window, timestamp);

      if (meta_prefs_get_auto_raise ())
        meta_display_queue_autoraise_callback (display, window);
      else
        meta_topic (META_DEBUG_FOCUS, "Auto raise is disabled\n");
    }
  else
    {
      /* In mouse focus mode, we defocus when the mouse *enters*
       * the DESKTOP window, instead of defocusing on LeaveNotify.
       * This is because having the mouse enter override-redirect
       * child windows unfortunately causes LeaveNotify events that
       * we can't distinguish from the mouse actually leaving the
       * toplevel window as we expect.  But, since we filter out
       * EnterNotify events on override-redirect windows, this
       * alternative mechanism works great.
       */
      if (meta_prefs_get_focus_mode() == G_DESKTOP_FOCUS_MODE_MOUSE &&
          display->focus_window != NULL)
        {
          meta_topic (META_DEBUG_FOCUS,
                      "Unsetting focus from %s due to mouse entering "
                      "the DESKTOP window\n",
                      display->focus_window->desc);
          meta_display_focus_the_no_focus_window (display,
                                                  window->screen,
                                                  timestamp);
        }
    }
}

static gboolean
window_focus_on_pointer_rest_callback (gpointer data) {
  MetaFocusData *focus_data;
  MetaDisplay *display;
  MetaScreen *screen;
  MetaWindow *window;
  Window root, child;
  double root_x, root_y, x, y;
  guint32 timestamp;
  XIButtonState buttons;
  XIModifierState mods;
  XIGroupState group;

  focus_data = data;
  display = focus_data->display;
  screen = focus_data->window->screen;

  if (meta_prefs_get_focus_mode () == G_DESKTOP_FOCUS_MODE_CLICK)
    goto out;

  meta_error_trap_push (display);
  XIQueryPointer (display->xdisplay,
                  META_VIRTUAL_CORE_POINTER_ID,
                  screen->xroot,
                  &root, &child,
                  &root_x, &root_y, &x, &y,
                  &buttons, &mods, &group);
  meta_error_trap_pop (display);
  free (buttons.mask);

  if (root_x != focus_data->pointer_x ||
      root_y != focus_data->pointer_y)
    {
      focus_data->pointer_x = root_x;
      focus_data->pointer_y = root_y;
      return TRUE;
    }

  /* Explicitly check for the overlay window, as get_focus_window_at_point()
   * may return windows that extend underneath the chrome (like
   * override-redirect or DESKTOP windows)
   */
  if (child == meta_get_overlay_window (screen))
    goto out;

  window =
      meta_stack_get_default_focus_window_at_point (screen->stack,
                                                    screen->active_workspace,
                                                    None, root_x, root_y);

  if (window == NULL)
    goto out;

  timestamp = meta_display_get_current_time_roundtrip (display);
  meta_display_mouse_mode_focus (display, window, timestamp);

out:
  display->focus_timeout_id = 0;
  return FALSE;
}

void
meta_display_queue_autoraise_callback (MetaDisplay *display,
                                       MetaWindow  *window)
{
  MetaAutoRaiseData *auto_raise_data;

  meta_topic (META_DEBUG_FOCUS, 
              "Queuing an autoraise timeout for %s with delay %d\n", 
              window->desc, 
              meta_prefs_get_auto_raise_delay ());
  
  auto_raise_data = g_new (MetaAutoRaiseData, 1);
  auto_raise_data->display = window->display;
  auto_raise_data->xwindow = window->xwindow;
  
  if (display->autoraise_timeout_id != 0)
    g_source_remove (display->autoraise_timeout_id);

  display->autoraise_timeout_id = 
    g_timeout_add_full (G_PRIORITY_DEFAULT,
                        meta_prefs_get_auto_raise_delay (),
                        window_raise_with_delay_callback,
                        auto_raise_data,
                        g_free);
  display->autoraise_window = window;
}

/* The interval, in milliseconds, we use in focus-follows-mouse
 * mode to check whether the pointer has stopped moving after a
 * crossing event.
 */
#define FOCUS_TIMEOUT_DELAY 25

static void
meta_display_queue_focus_callback (MetaDisplay *display,
                                   MetaWindow  *window,
                                   int          pointer_x,
                                   int          pointer_y)
{
  MetaFocusData *focus_data;

  focus_data = g_new (MetaFocusData, 1);
  focus_data->display = display;
  focus_data->window = window;
  focus_data->pointer_x = pointer_x;
  focus_data->pointer_y = pointer_y;

  if (display->focus_timeout_id != 0)
    g_source_remove (display->focus_timeout_id);

  display->focus_timeout_id =
    g_timeout_add_full (G_PRIORITY_DEFAULT,
                        FOCUS_TIMEOUT_DELAY,
                        window_focus_on_pointer_rest_callback,
                        focus_data,
                        g_free);
}

#if 0
static void
handle_net_restack_window (MetaDisplay* display,
                           XEvent *event)
{
  MetaWindow *window;

  window = meta_display_lookup_x_window (display,
                                         event->xclient.window);

  if (window)
    {
      /* FIXME: The EWMH includes a sibling for the restack request, but we
       * (stupidly) don't currently support these types of raises.
       *
       * Also, unconditionally following these is REALLY stupid--we should
       * combine this code with the stuff in
       * meta_window_configure_request() which is smart about whether to
       * follow the request or do something else (though not smart enough
       * and is also too stupid to handle the sibling stuff).
       */
      switch (event->xclient.data.l[2])
        {
        case Above:
          meta_window_raise (window);
          break;
        case Below:
          meta_window_lower (window);
          break;
        case TopIf:
        case BottomIf:
        case Opposite:
          break;          
        }
    }
}
#endif

static XIEvent *
get_input_event (MetaDisplay *display,
                 XEvent      *event)
{
  if (event->type == GenericEvent &&
      event->xcookie.extension == display->xinput_opcode)
    {
      XIEvent *input_event;

      /* NB: GDK event filters already have generic events
       * allocated, so no need to do XGetEventData() on our own
       */
      input_event = (XIEvent *) event->xcookie.data;

      switch (input_event->evtype)
        {
        case XI_Motion:
        case XI_ButtonPress:
        case XI_ButtonRelease:
          if (((XIDeviceEvent *) input_event)->deviceid == META_VIRTUAL_CORE_POINTER_ID)
            return input_event;
        case XI_KeyPress:
        case XI_KeyRelease:
          if (((XIDeviceEvent *) input_event)->deviceid == META_VIRTUAL_CORE_KEYBOARD_ID)
            return input_event;
        case XI_FocusIn:
        case XI_FocusOut:
          if (((XIEnterEvent *) input_event)->deviceid == META_VIRTUAL_CORE_KEYBOARD_ID)
            return input_event;
        case XI_Enter:
        case XI_Leave:
          if (((XIEnterEvent *) input_event)->deviceid == META_VIRTUAL_CORE_POINTER_ID)
            return input_event;
          break;
#ifdef HAVE_XI23
        case XI_BarrierHit:
        case XI_BarrierLeave:
          if (((XIBarrierEvent *) input_event)->deviceid == META_VIRTUAL_CORE_POINTER_ID)
            return input_event;
          break;
#endif /* HAVE_XI23 */
        default:
          break;
        }
    }

  return NULL;
}

static void
update_focus_window (MetaDisplay   *display,
                     MetaFocusType  type,
                     MetaWindow    *window,
                     Window         xwindow,
                     gulong         serial)
{
#ifdef HAVE_WAYLAND
  MetaWaylandCompositor *compositor;
#endif

  display->focus_serial = serial;

  if (display->focus_xwindow == xwindow &&
      display->focus_type == type &&
      display->focus_window == window)
    return;

  if (display->focus_window)
    {
      MetaWindow *previous;

      meta_topic (META_DEBUG_FOCUS,
                  "%s is now the previous focus window due to being focused out or unmapped\n",
                  display->focus_window->desc);

      /* Make sure that signals handlers invoked by
       * meta_window_set_focused_internal() don't see
       * display->focus_window->has_focus == FALSE
       */
      previous = display->focus_window;
      display->focus_window = NULL;
      display->focus_xwindow = None;

      meta_window_set_focused_internal (previous, FALSE);
    }

  display->focus_type = type;
  display->focus_window = window;
  display->focus_xwindow = xwindow;

  if (display->focus_window)
    {
      meta_topic (META_DEBUG_FOCUS, "* Focus --> %s with serial %lu\n",
                  display->focus_window->desc, serial);
      meta_window_set_focused_internal (display->focus_window, TRUE);
    }
  else
    meta_topic (META_DEBUG_FOCUS, "* Focus --> NULL with serial %lu\n", serial);

#ifdef HAVE_WAYLAND
  if (meta_is_wayland_compositor ())
    {
      compositor = meta_wayland_compositor_get_default ();

      if (display->focus_type == META_FOCUS_NO_FOCUS_WINDOW ||
          display->focus_type == META_FOCUS_STAGE)
        meta_wayland_compositor_set_input_focus (compositor, NULL);
      else if (window && window->surface)
        meta_wayland_compositor_set_input_focus (compositor, window);
      else
        meta_topic (META_DEBUG_FOCUS, "Focus change has no effect, because there is no matching wayland surface");
     }
#endif

  g_object_notify (G_OBJECT (display), "focus-window");
  meta_display_update_active_window_hint (display);
}

static gboolean
timestamp_too_old (MetaDisplay *display,
                   guint32     *timestamp)
{
  /* FIXME: If Soeren's suggestion in bug 151984 is implemented, it will allow
   * us to sanity check the timestamp here and ensure it doesn't correspond to
   * a future time (though we would want to rename to
   * timestamp_too_old_or_in_future).
   */

  if (*timestamp == CurrentTime)
    {
      *timestamp = meta_display_get_current_time_roundtrip (display);
      return FALSE;
    }
  else if (XSERVER_TIME_IS_BEFORE (*timestamp, display->last_focus_time))
    {
      if (XSERVER_TIME_IS_BEFORE (*timestamp, display->last_user_time))
        return TRUE;
      else
        {
          *timestamp = display->last_focus_time;
          return FALSE;
        }
    }

  return FALSE;
}

static void
request_xserver_input_focus_change (MetaDisplay   *display,
                                    MetaScreen    *screen,
                                    MetaFocusType  type,
                                    MetaWindow    *meta_window,
                                    Window         xwindow,
                                    guint32        timestamp)
{
  gulong serial;

  if (timestamp_too_old (display, &timestamp))
    return;

  meta_error_trap_push (display);

  /* In order for mutter to know that the focus request succeeded, we track
   * the serial of the "focus request" we made, but if we take the serial
   * of the XSetInputFocus request, then there's no way to determine the
   * difference between focus events as a result of the SetInputFocus and
   * focus events that other clients send around the same time. Ensure that
   * we know which is which by making two requests that the server will
   * process at the same time.
   */
  meta_display_grab (display);

  serial = XNextRequest (display->xdisplay);

  XSetInputFocus (display->xdisplay,
                  xwindow,
                  RevertToPointerRoot,
                  timestamp);

  XChangeProperty (display->xdisplay, display->timestamp_pinging_window,
                   display->atom__MUTTER_FOCUS_SET,
                   XA_STRING, 8, PropModeAppend, NULL, 0);

  meta_display_ungrab (display);

  update_focus_window (display,
                       type,
                       meta_window,
                       xwindow,
                       serial);

  meta_error_trap_pop (display);

  display->last_focus_time = timestamp;
  display->active_screen = screen;

  if (meta_window == NULL || meta_window != display->autoraise_window)
    meta_display_remove_autoraise_callback (display);
}

static void
handle_window_focus_event (MetaDisplay  *display,
                           MetaWindow   *window,
                           XIEnterEvent *event,
                           unsigned long serial)
{
  MetaWindow *focus_window;
  MetaFocusType type;
#ifdef WITH_VERBOSE_MODE
  const char *window_type;

  type = META_FOCUS_NONE;

  /* Note the event can be on either the window or the frame,
   * we focus the frame for shaded windows
   */
  if (window)
    {
      if (event->event == window->xwindow)
        window_type = "client window";
      else if (window->frame && event->event == window->frame->xwindow)
        window_type = "frame window";
      else
        window_type = "unknown client window";

      if (window->client_type == META_WINDOW_CLIENT_TYPE_WAYLAND)
        type = META_FOCUS_WAYLAND_CLIENT;
      else
        type = META_FOCUS_X_CLIENT;
    }
  else if (meta_display_xwindow_is_a_no_focus_window (display, event->event))
    {
      window_type = "no_focus_window";
      type = META_FOCUS_NO_FOCUS_WINDOW;
    }
  else if (meta_display_screen_for_root (display, event->event))
    window_type = "root window";
  else
    window_type = "unknown window";

  /* Don't change type if we don't know the new window */
  if (type == META_FOCUS_NONE)
    type = display->focus_type;

  meta_topic (META_DEBUG_FOCUS,
              "Focus %s event received on %s 0x%lx (%s) "
              "mode %s detail %s serial %lu\n",
              event->evtype == XI_FocusIn ? "in" :
              event->evtype == XI_FocusOut ? "out" :
              "???",
              window ? window->desc : "",
              event->event, window_type,
              meta_event_mode_to_string (event->mode),
              meta_event_detail_to_string (event->mode),
              event->serial);
#endif

  /* FIXME our pointer tracking is broken; see how
   * gtk+/gdk/x11/gdkevents-x11.c or XFree86/xc/programs/xterm/misc.c
   * for how to handle it the correct way.  In brief you need to track
   * pointer focus and regular focus, and handle EnterNotify in
   * PointerRoot mode with no window manager.  However as noted above,
   * accurate focus tracking will break things because we want to keep
   * windows "focused" when using keybindings on them, and also we
   * sometimes "focus" a window by focusing its frame or
   * no_focus_window; so this all needs rethinking massively.
   *
   * My suggestion is to change it so that we clearly separate
   * actual keyboard focus tracking using the xterm algorithm,
   * and mutter's "pretend" focus window, and go through all
   * the code and decide which one should be used in each place;
   * a hard bit is deciding on a policy for that.
   *
   * http://bugzilla.gnome.org/show_bug.cgi?id=90382
   */

  /* We ignore grabs, though this is questionable. It may be better to
   * increase the intelligence of the focus window tracking.
   *
   * The problem is that keybindings for windows are done with
   * XGrabKey, which means focus_window disappears and the front of
   * the MRU list gets confused from what the user expects once a
   * keybinding is used.
   */

  if (event->mode == XINotifyGrab ||
      event->mode == XINotifyUngrab ||
      /* From WindowMaker, ignore all funky pointer root events */
      event->detail > XINotifyNonlinearVirtual)
    {
      meta_topic (META_DEBUG_FOCUS,
                  "Ignoring focus event generated by a grab or other weirdness\n");
      return;
    }

  if (event->evtype == XI_FocusIn)
    {
      display->server_focus_window = event->event;
      display->server_focus_serial = serial;
      focus_window = window;
    }
  else if (event->evtype == XI_FocusOut)
    {
      if (event->detail == XINotifyInferior)
        {
          /* This event means the client moved focus to a subwindow */
          meta_topic (META_DEBUG_FOCUS,
                      "Ignoring focus out with NotifyInferior\n");
          return;
        }

      display->server_focus_window = None;
      display->server_focus_serial = serial;
      focus_window = NULL;
    }
  else
    g_return_if_reached ();

  if (display->server_focus_serial > display->focus_serial)
    {
      update_focus_window (display,
                           type,
                           focus_window,
                           focus_window ? focus_window->xwindow : None,
                           display->server_focus_serial);
    }
}

/**
 * meta_display_handle_event:
 * @display: The MetaDisplay that events are coming from
 * @event: The event that just happened
 *
 * This is the most important function in the whole program. It is the heart,
 * it is the nexus, it is the Grand Central Station of Mutter's world.
 * When we create a #MetaDisplay, we ask GDK to pass *all* events for *all*
 * windows to this function. So every time anything happens that we might
 * want to know about, this function gets called. You see why it gets a bit
 * busy around here. Most of this function is a ginormous switch statement
 * dealing with all the kinds of events that might turn up.
 */
gboolean
meta_display_handle_event (MetaDisplay *display,
                           XEvent   *event)
{
  MetaWindow *window;
  MetaWindow *property_for_window;
  Window modified;
  gboolean frame_was_receiver;
  gboolean bypass_compositor;
  gboolean filter_out_event;
  XIEvent *input_event;
  MetaScreen *screen;

#ifdef WITH_VERBOSE_MODE
  if (dump_events)
    meta_spew_event (display, event);
#endif

#ifdef HAVE_STARTUP_NOTIFICATION
  sn_display_process_event (display->sn_display, event);
#endif
  
  bypass_compositor = FALSE;
  filter_out_event = FALSE;
  display->current_time = event_get_time (display, event);
  display->monitor_cache_invalidated = TRUE;

  if (event->xany.serial > display->focus_serial &&
      display->focus_window &&
      display->focus_window->xwindow != display->server_focus_window)
    {
      meta_topic (META_DEBUG_FOCUS, "Earlier attempt to focus %s failed\n",
                  display->focus_window->desc);
      update_focus_window (display,
                           META_FOCUS_NONE,
                           meta_display_lookup_x_window (display, display->server_focus_window),
                           display->server_focus_window,
                           display->server_focus_serial);
    }

  screen = meta_display_screen_for_root (display, event->xany.window);
  if (screen)
    {
      if (meta_screen_handle_xevent (screen, event))
        return TRUE;
    }

  modified = event_get_modified_window (display, event);

  input_event = get_input_event (display, event);
  
  if (event->type == UnmapNotify)
    {
      if (meta_ui_window_should_not_cause_focus (display->xdisplay,
                                                 modified))
        {
          meta_display_add_ignored_crossing_serial (display, event->xany.serial);
          meta_topic (META_DEBUG_FOCUS,
                      "Adding EnterNotify serial %lu to ignored focus serials\n",
                      event->xany.serial);
        }
    }
  else if (input_event &&
           input_event->evtype == XI_Leave &&
           ((XILeaveEvent *)input_event)->mode == XINotifyUngrab &&
           modified == display->ungrab_should_not_cause_focus_window)
    {
      meta_display_add_ignored_crossing_serial (display, event->xany.serial);
      meta_topic (META_DEBUG_FOCUS,
                  "Adding LeaveNotify serial %lu to ignored focus serials\n",
                  event->xany.serial);
    }

  if (modified != None)
    window = meta_display_lookup_x_window (display, modified);
  else
    window = NULL;

  /* We only want to respond to _NET_WM_USER_TIME property notify
   * events on _NET_WM_USER_TIME_WINDOW windows; in particular,
   * responding to UnmapNotify events is kind of bad.
   */
  property_for_window = NULL;
  if (window && modified == window->user_time_window)
    {
      property_for_window = window;
      window = NULL;
    }
    

  frame_was_receiver = FALSE;
  if (window &&
      window->frame &&
      modified == window->frame->xwindow)
    {
      /* Note that if the frame and the client both have an
       * XGrabButton (as is normal with our setup), the event
       * goes to the frame.
       */
      frame_was_receiver = TRUE;
      meta_topic (META_DEBUG_EVENTS, "Frame was receiver of event for %s\n",
                  window->desc);
    }

#ifdef HAVE_XSYNC
  if (META_DISPLAY_HAS_XSYNC (display) &&
      event->type == (display->xsync_event_base + XSyncAlarmNotify))
    {
      MetaWindow *alarm_window = meta_display_lookup_sync_alarm (display,
                                                                 ((XSyncAlarmNotifyEvent*)event)->alarm);

      if (alarm_window != NULL)
        {
          XSyncValue value = ((XSyncAlarmNotifyEvent*)event)->counter_value;
          gint64 new_counter_value;
          new_counter_value = XSyncValueLow32 (value) + ((gint64)XSyncValueHigh32 (value) << 32);
          meta_window_update_sync_request_counter (alarm_window, new_counter_value);
          filter_out_event = TRUE; /* GTK doesn't want to see this really */
        }

      meta_idle_monitor_handle_xevent_all (event);
    }
#endif /* HAVE_XSYNC */

#ifdef HAVE_SHAPE
  if (META_DISPLAY_HAS_SHAPE (display) && 
      event->type == (display->shape_event_base + ShapeNotify))
    {
      filter_out_event = TRUE; /* GTK doesn't want to see this really */
      
      if (window && !frame_was_receiver)
        {
          XShapeEvent *sev = (XShapeEvent*) event;

          if (sev->kind == ShapeBounding)
            {
              if (sev->shaped && !window->has_shape)
                {
                  window->has_shape = TRUE;                  
                  meta_topic (META_DEBUG_SHAPES,
                              "Window %s now has a shape\n",
                              window->desc);
                }
              else if (!sev->shaped && window->has_shape)
                {
                  window->has_shape = FALSE;
                  meta_topic (META_DEBUG_SHAPES,
                              "Window %s no longer has a shape\n",
                              window->desc);
                }
              else
                {
                  meta_topic (META_DEBUG_SHAPES,
                              "Window %s shape changed\n",
                              window->desc);
                }

              if (display->compositor)
                meta_compositor_window_x11_shape_changed (display->compositor,
                                                          window);
            }
          else if (sev->kind == ShapeInput)
            {
              if (sev->shaped && !window->has_input_shape)
                {
                  window->has_input_shape = TRUE;                  
                  meta_topic (META_DEBUG_SHAPES,
                              "Window %s now has an input shape\n",
                              window->desc);
                }
              else if (!sev->shaped && window->has_input_shape)
                {
                  window->has_input_shape = FALSE;
                  meta_topic (META_DEBUG_SHAPES,
                              "Window %s no longer has an input shape\n",
                              window->desc);
                }
              else
                {
                  meta_topic (META_DEBUG_SHAPES,
                              "Window %s input shape changed\n",
                              window->desc);
                }

              if (display->compositor)
                meta_compositor_window_x11_shape_changed (display->compositor,
                                                          window);
            }
        }
      else
        {
          meta_topic (META_DEBUG_SHAPES,
                      "ShapeNotify not on a client window (window %s frame_was_receiver = %d)\n",
                      window ? window->desc : "(none)",
                      frame_was_receiver);
        }
    }
#endif /* HAVE_SHAPE */

  if (input_event != NULL)
    {
      XIDeviceEvent *device_event = (XIDeviceEvent *) input_event;
      XIEnterEvent *enter_event = (XIEnterEvent *) input_event;

      if (window && !window->override_redirect &&
          ((input_event->type == XI_KeyPress) || (input_event->type == XI_ButtonPress)))
        {
          if (CurrentTime == display->current_time)
            {
              /* We can't use missing (i.e. invalid) timestamps to set user time,
               * nor do we want to use them to sanity check other timestamps.
               * See bug 313490 for more details.
               */
              meta_warning ("Event has no timestamp! You may be using a broken "
                            "program such as xse.  Please ask the authors of that "
                            "program to fix it.\n");
            }
          else
            {
              meta_window_set_user_time (window, display->current_time);
              sanity_check_timestamps (display, display->current_time);
            }
        }
  
      switch (input_event->evtype)
        {
        case XI_KeyPress:
        case XI_KeyRelease:

          /* For key events, it's important to enforce single-handling, or
           * we can get into a confused state. So if a keybinding is
           * handled (because it's one of our hot-keys, or because we are
           * in a keyboard-grabbed mode like moving a window, we don't
           * want to pass the key event to the compositor or GTK+ at all.
           */
          if (meta_display_process_key_event (display, window, (XIDeviceEvent *) input_event))
            filter_out_event = bypass_compositor = TRUE;
          break;
        case XI_ButtonPress:
          if (display->grab_op == META_GRAB_OP_COMPOSITOR)
            break;

          display->overlay_key_only_pressed = FALSE;

          if (device_event->detail == 4 || device_event->detail == 5)
            /* Scrollwheel event, do nothing and deliver event to compositor below */
            break;

          if ((window &&
               meta_grab_op_is_mouse (display->grab_op) &&
               display->grab_button != device_event->detail &&
               display->grab_window == window) ||
              grab_op_is_keyboard (display->grab_op))
            {
              meta_topic (META_DEBUG_WINDOW_OPS,
                          "Ending grab op %u on window %s due to button press\n",
                          display->grab_op,
                          (display->grab_window ?
                           display->grab_window->desc : 
                           "none"));
              if (GRAB_OP_IS_WINDOW_SWITCH (display->grab_op))
                {
                  MetaScreen *screen;
                  meta_topic (META_DEBUG_WINDOW_OPS, 
                              "Syncing to old stack positions.\n");
                  screen = 
                    meta_display_screen_for_root (display, device_event->event);

                  if (screen!=NULL)
                    meta_stack_set_positions (screen->stack,
                                              display->grab_old_window_stacking);
                }
              meta_display_end_grab_op (display,
                                        device_event->time);
            }
          else if (window && display->grab_op == META_GRAB_OP_NONE)
            {
              gboolean begin_move = FALSE;
              unsigned int grab_mask;
              gboolean unmodified;

              grab_mask = display->window_grab_modifiers;
              if (g_getenv ("MUTTER_DEBUG_BUTTON_GRABS"))
                grab_mask |= ControlMask;

              /* Two possible sources of an unmodified event; one is a
               * client that's letting button presses pass through to the
               * frame, the other is our focus_window_grab on unmodified
               * button 1.  So for all such events we focus the window.
               */
              unmodified = (device_event->mods.effective & grab_mask) == 0;
          
              if (unmodified ||
                  device_event->detail == 1)
                {
                  /* don't focus if frame received, will be lowered in
                   * frames.c or special-cased if the click was on a
                   * minimize/close button.
                   */
                  if (!frame_was_receiver)
                    {
                      if (meta_prefs_get_raise_on_click ()) 
                        meta_window_raise (window);
                      else
                        meta_topic (META_DEBUG_FOCUS,
                                    "Not raising window on click due to don't-raise-on-click option\n");

                      /* Don't focus panels--they must explicitly request focus.
                       * See bug 160470
                       */
                      if (window->type != META_WINDOW_DOCK)
                        {
                          meta_topic (META_DEBUG_FOCUS,
                                      "Focusing %s due to unmodified button %u press (display.c)\n",
                                      window->desc, device_event->detail);
                          meta_window_focus (window, device_event->time);
                        }
                      else
                        /* However, do allow terminals to lose focus due to new
                         * window mappings after the user clicks on a panel.
                         */
                        display->allow_terminal_deactivation = TRUE;
                    }
              
                  /* you can move on alt-click but not on
                   * the click-to-focus
                   */
                  if (!unmodified)
                    begin_move = TRUE;
                }
              else if (!unmodified && device_event->detail == meta_prefs_get_mouse_button_resize())
                {
                  if (window->has_resize_func)
                    {
                      gboolean north, south;
                      gboolean west, east;
                      int root_x, root_y;
                      MetaGrabOp op;

                      meta_window_get_position (window, &root_x, &root_y);

                      west = device_event->root_x <  (root_x + 1 * window->rect.width  / 3);
                      east = device_event->root_x >  (root_x + 2 * window->rect.width  / 3);
                      north = device_event->root_y < (root_y + 1 * window->rect.height / 3);
                      south = device_event->root_y > (root_y + 2 * window->rect.height / 3);

                      if (north && west)
                        op = META_GRAB_OP_RESIZING_NW;
                      else if (north && east)
                        op = META_GRAB_OP_RESIZING_NE;
                      else if (south && west)
                        op = META_GRAB_OP_RESIZING_SW;
                      else if (south && east)
                        op = META_GRAB_OP_RESIZING_SE;
                      else if (north)
                        op = META_GRAB_OP_RESIZING_N;
                      else if (west)
                        op = META_GRAB_OP_RESIZING_W;
                      else if (east)
                        op = META_GRAB_OP_RESIZING_E;
                      else if (south)
                        op = META_GRAB_OP_RESIZING_S;
                      else /* Middle region is no-op to avoid user triggering wrong action */
                        op = META_GRAB_OP_NONE;
                  
                      if (op != META_GRAB_OP_NONE)
                        meta_display_begin_grab_op (display,
                                                    window->screen,
                                                    window,
                                                    op,
                                                    TRUE,
                                                    FALSE,
                                                    device_event->detail,
                                                    0,
                                                    device_event->time,
                                                    device_event->root_x,
                                                    device_event->root_y);
                    }
                }
              else if (device_event->detail == meta_prefs_get_mouse_button_menu())
                {
                  if (meta_prefs_get_raise_on_click ())
                    meta_window_raise (window);
                  meta_window_show_menu (window,
                                         device_event->root_x,
                                         device_event->root_y,
                                         device_event->detail,
                                         device_event->time);
                }

              if (!frame_was_receiver && unmodified)
                {
                  /* This is from our synchronous grab since
                   * it has no modifiers and was on the client window
                   */

                  meta_verbose ("Allowing events time %u\n",
                                (unsigned int)device_event->time);

                  XIAllowEvents (display->xdisplay, device_event->deviceid,
                                 XIReplayDevice, device_event->time);
                }

              if (begin_move && window->has_move_func)
                {
                  meta_display_begin_grab_op (display,
                                              window->screen,
                                              window,
                                              META_GRAB_OP_MOVING,
                                              TRUE,
                                              FALSE,
                                              device_event->detail,
                                              0,
                                              device_event->time,
                                              device_event->root_x,
                                              device_event->root_y);
                }
            }
          break;
        case XI_ButtonRelease:
          if (display->grab_op == META_GRAB_OP_COMPOSITOR)
            break;

          display->overlay_key_only_pressed = FALSE;

          if (display->grab_window == window &&
              meta_grab_op_is_mouse (display->grab_op))
            meta_window_handle_mouse_grab_op_event (window, device_event);
          break;
        case XI_Motion:
          if (display->grab_op == META_GRAB_OP_COMPOSITOR)
            break;

          if (display->grab_window == window &&
              meta_grab_op_is_mouse (display->grab_op))
            meta_window_handle_mouse_grab_op_event (window, device_event);
          break;
        case XI_Enter:
          if (display->grab_op == META_GRAB_OP_COMPOSITOR)
            break;

          /* If the mouse switches screens, active the default window on the new
           * screen; this will make keybindings and workspace-launched items
           * actually appear on the right screen.
           */
          {
            MetaScreen *new_screen = 
              meta_display_screen_for_root (display, enter_event->root);

            if (new_screen != NULL && display->active_screen != new_screen)
              meta_workspace_focus_default_window (new_screen->active_workspace, 
                                                   NULL,
                                                   enter_event->time);
          }

          /* Check if we've entered a window; do this even if window->has_focus to
           * avoid races.
           */
          if (window && !crossing_serial_is_ignored (display, event->xany.serial) &&
              enter_event->mode != XINotifyGrab && 
              enter_event->mode != XINotifyUngrab &&
              enter_event->detail != XINotifyInferior &&
              meta_display_focus_sentinel_clear (display))
            {
              switch (meta_prefs_get_focus_mode ())
                {
                case G_DESKTOP_FOCUS_MODE_SLOPPY:
                case G_DESKTOP_FOCUS_MODE_MOUSE:
                  display->mouse_mode = TRUE;
                  if (window->type != META_WINDOW_DOCK)
                    {
                      meta_topic (META_DEBUG_FOCUS,
                                  "Queuing a focus change for %s due to "
                                  "enter notify with serial %lu at time %lu, "
                                  "and setting display->mouse_mode to TRUE.\n",
                                  window->desc,
                                  event->xany.serial,
                                  enter_event->time);

                      if (meta_prefs_get_focus_change_on_pointer_rest())
                        meta_display_queue_focus_callback (display, window,
                                                           enter_event->root_x,
                                                           enter_event->root_y);
                      else
                        meta_display_mouse_mode_focus (display, window,
                                                       enter_event->time);

                      /* stop ignoring stuff */
                      reset_ignored_crossing_serials (display);
                    }
                  break;
                case G_DESKTOP_FOCUS_MODE_CLICK:
                  break;
                }
          
              if (window->type == META_WINDOW_DOCK)
                meta_window_raise (window);
            }
          break;
        case XI_Leave:
          if (display->grab_op == META_GRAB_OP_COMPOSITOR)
            break;

          if (window != NULL)
            {
              if (window->type == META_WINDOW_DOCK &&
                  enter_event->mode != XINotifyGrab &&
                  enter_event->mode != XINotifyUngrab &&
                  !window->has_focus)
                meta_window_lower (window);
            }
          break;
        case XI_FocusIn:
        case XI_FocusOut:
          /* libXi does not properly copy the serial to the XIEnterEvent, so pull it
           * from the parent XAnyEvent.
           * See: https://bugs.freedesktop.org/show_bug.cgi?id=64687
           */
          handle_window_focus_event (display, window, enter_event, event->xany.serial);
          if (!window)
            {
              /* Check if the window is a root window. */
              MetaScreen *screen =
                meta_display_screen_for_root(display,
                                             enter_event->event);
              if (screen == NULL)
                break;
          
              if (enter_event->evtype == XI_FocusIn &&
                  enter_event->mode == XINotifyDetailNone)
                {
                  meta_topic (META_DEBUG_FOCUS, 
                              "Focus got set to None, probably due to "
                              "brain-damage in the X protocol (see bug "
                              "125492).  Setting the default focus window.\n");
                  meta_workspace_focus_default_window (screen->active_workspace,
                                                       NULL,
                                                       meta_display_get_current_time_roundtrip (display));
                }
              else if (enter_event->evtype == XI_FocusIn &&
                       enter_event->mode == XINotifyNormal &&
                       enter_event->detail == XINotifyInferior)
                {
                  meta_topic (META_DEBUG_FOCUS,
                              "Focus got set to root window, probably due to "
                              "gnome-session logout dialog usage (see bug "
                              "153220).  Setting the default focus window.\n");
                  meta_workspace_focus_default_window (screen->active_workspace,
                                                       NULL,
                                                       meta_display_get_current_time_roundtrip (display));
                }

            }
          break;
#ifdef HAVE_XI23
        case XI_BarrierHit:
        case XI_BarrierLeave:
          if (meta_display_process_barrier_event (display, (XIBarrierEvent *) input_event))
            filter_out_event = bypass_compositor = TRUE;
          break;
#endif /* HAVE_XI23 */
        }
    }
  else
    {
      switch (event->type)
        {
        case KeymapNotify:
          break;
        case Expose:
          break;
        case GraphicsExpose:
          break;
        case NoExpose:
          break;
        case VisibilityNotify:
          break;
        case CreateNotify:
          {
            MetaScreen *screen;

            screen = meta_display_screen_for_root (display,
                                                   event->xcreatewindow.parent);
            if (screen)
              meta_stack_tracker_create_event (screen->stack_tracker,
                                               &event->xcreatewindow);
          }
          break;
      
        case DestroyNotify:
          {
            MetaScreen *screen;

            screen = meta_display_screen_for_root (display,
                                                   event->xdestroywindow.event);
            if (screen)
              meta_stack_tracker_destroy_event (screen->stack_tracker,
                                                &event->xdestroywindow);
          }
          if (window)
            {
              /* FIXME: It sucks that DestroyNotify events don't come with
               * a timestamp; could we do something better here?  Maybe X
               * will change one day?
               */
              guint32 timestamp;
              timestamp = meta_display_get_current_time_roundtrip (display);

              if (display->grab_op != META_GRAB_OP_NONE &&
                  display->grab_window == window)
                meta_display_end_grab_op (display, timestamp);
          
              if (frame_was_receiver)
                {
                  meta_warning ("Unexpected destruction of frame 0x%lx, not sure if this should silently fail or be considered a bug\n",
                                window->frame->xwindow);
                  meta_error_trap_push (display);
                  meta_window_destroy_frame (window->frame->window);
                  meta_error_trap_pop (display);
                }
              else
                {
                  /* Unmanage destroyed window */
                  meta_window_unmanage (window, timestamp);
                  window = NULL;
                }
            }
          break;
        case UnmapNotify:
          if (window)
            {
              /* FIXME: It sucks that UnmapNotify events don't come with
               * a timestamp; could we do something better here?  Maybe X
               * will change one day?
               */
              guint32 timestamp;
              timestamp = meta_display_get_current_time_roundtrip (display);

              if (display->grab_op != META_GRAB_OP_NONE &&
                  display->grab_window == window &&
                  ((window->frame == NULL) || !window->frame->mapped))
                meta_display_end_grab_op (display, timestamp);
      
              if (!frame_was_receiver)
                {
                  if (window->unmaps_pending == 0)
                    {
                      meta_topic (META_DEBUG_WINDOW_STATE,
                                  "Window %s withdrawn\n",
                                  window->desc);

                      /* Unmanage withdrawn window */		  
                      window->withdrawn = TRUE;
                      meta_window_unmanage (window, timestamp);
                      window = NULL;
                    }
                  else
                    {
                      window->unmaps_pending -= 1;
                      meta_topic (META_DEBUG_WINDOW_STATE,
                                  "Received pending unmap, %d now pending\n",
                                  window->unmaps_pending);
                    }
                }
            }
          break;
        case MapNotify:
          /* NB: override redirect windows wont cause a map request so we
           * watch out for map notifies against any root windows too if a
           * compositor is enabled: */
          if (display->compositor && window == NULL
              && meta_display_screen_for_root (display, event->xmap.event))
            {
              window = meta_window_new (display, event->xmap.window,
                                        FALSE);
            }
          break;
        case MapRequest:
          if (window == NULL)
            {
              window = meta_window_new (display, event->xmaprequest.window,
                                        FALSE);
            }
          /* if frame was receiver it's some malicious send event or something */
          else if (!frame_was_receiver && window)        
            {
              meta_verbose ("MapRequest on %s mapped = %d minimized = %d\n",
                            window->desc, window->mapped, window->minimized);
              if (window->minimized)
                {
                  meta_window_unminimize (window);
                  if (window->workspace != window->screen->active_workspace)
                    {
                      meta_verbose ("Changing workspace due to MapRequest mapped = %d minimized = %d\n",
                                    window->mapped, window->minimized);
                      meta_window_change_workspace (window,
                                                    window->screen->active_workspace);
                    }
                }
            }
          break;
        case ReparentNotify:
          {
            MetaScreen *screen;

            screen = meta_display_screen_for_root (display,
                                                   event->xconfigure.event);
            if (screen)
              meta_stack_tracker_reparent_event (screen->stack_tracker,
                                                 &event->xreparent);
          }
          break;
        case ConfigureNotify:
          if (event->xconfigure.event != event->xconfigure.window)
            {
              MetaScreen *screen;

              screen = meta_display_screen_for_root (display,
                                                     event->xconfigure.event);
              if (screen)
                meta_stack_tracker_configure_event (screen->stack_tracker,
                                                    &event->xconfigure);
            }
          if (window && window->override_redirect)
            meta_window_configure_notify (window, &event->xconfigure);
          else
            /* Handle screen resize */
            {
              MetaScreen *screen;

              screen = meta_display_screen_for_root (display,
                                                     event->xconfigure.window);

              if (screen != NULL)
                {
#ifdef HAVE_RANDR
                  /* do the resize the official way */
                  XRRUpdateConfiguration (event);
#else
                  /* poke around in Xlib */
                  screen->xscreen->width   = event->xconfigure.width;
                  screen->xscreen->height  = event->xconfigure.height;
#endif
	      
                  meta_screen_resize (screen, 
                                      event->xconfigure.width,
                                      event->xconfigure.height);
                }
            }
          break;
        case ConfigureRequest:
          /* This comment and code is found in both twm and fvwm */
          /*
           * According to the July 27, 1988 ICCCM draft, we should ignore size and
           * position fields in the WM_NORMAL_HINTS property when we map a window.
           * Instead, we'll read the current geometry.  Therefore, we should respond
           * to configuration requests for windows which have never been mapped.
           */
          if (window == NULL)
            {
              unsigned int xwcm;
              XWindowChanges xwc;
          
              xwcm = event->xconfigurerequest.value_mask &
                (CWX | CWY | CWWidth | CWHeight | CWBorderWidth);

              xwc.x = event->xconfigurerequest.x;
              xwc.y = event->xconfigurerequest.y;
              xwc.width = event->xconfigurerequest.width;
              xwc.height = event->xconfigurerequest.height;
              xwc.border_width = event->xconfigurerequest.border_width;

              meta_verbose ("Configuring withdrawn window to %d,%d %dx%d border %d (some values may not be in mask)\n",
                            xwc.x, xwc.y, xwc.width, xwc.height, xwc.border_width);
              meta_error_trap_push (display);
              XConfigureWindow (display->xdisplay, event->xconfigurerequest.window,
                                xwcm, &xwc);
              meta_error_trap_pop (display);
            }
          else
            {
              if (!frame_was_receiver)
                meta_window_configure_request (window, event);
            }
          break;
        case GravityNotify:
          break;
        case ResizeRequest:
          break;
        case CirculateNotify:
          break;
        case CirculateRequest:
          break;
        case PropertyNotify:
          {
            MetaGroup *group;
            MetaScreen *screen;
        
            if (window && !frame_was_receiver)
              meta_window_property_notify (window, event);
            else if (property_for_window && !frame_was_receiver)
              meta_window_property_notify (property_for_window, event);

            group = meta_display_lookup_group (display,
                                               event->xproperty.window);
            if (group != NULL)
              meta_group_property_notify (group, event);
        
            screen = NULL;
            if (window == NULL &&
                group == NULL) /* window/group != NULL means it wasn't a root window */
              screen = meta_display_screen_for_root (display,
                                                     event->xproperty.window);
            
            if (screen != NULL)
              {
                if (event->xproperty.atom ==
                    display->atom__NET_DESKTOP_LAYOUT)
                  meta_screen_update_workspace_layout (screen);
                else if (event->xproperty.atom ==
                         display->atom__NET_DESKTOP_NAMES)
                  meta_screen_update_workspace_names (screen);
#if 0
                else if (event->xproperty.atom ==
                         display->atom__NET_RESTACK_WINDOW)
                  handle_net_restack_window (display, event);
#endif

                /* we just use this property as a sentinel to avoid
                 * certain race conditions.  See the comment for the
                 * sentinel_counter variable declaration in display.h
                 */
                if (event->xproperty.atom ==
                    display->atom__MUTTER_SENTINEL)
                  {
                    meta_display_decrement_focus_sentinel (display);
                  }
              }
          }
          break;
        case SelectionClear:
          /* do this here instead of at end of function
           * so we can return
           */

          /* FIXME: Clearing display->current_time here makes no sense to
           * me; who put this here and why?
           */
          display->current_time = CurrentTime;

          process_selection_clear (display, event);
          /* Note that processing that may have resulted in
           * closing the display... so return right away.
           */
          return FALSE;
        case SelectionRequest:
          process_selection_request (display, event);
          break;
        case SelectionNotify:
          break;
        case ColormapNotify:
          if (window && !frame_was_receiver)
            window->colormap = event->xcolormap.colormap;
          break;
        case ClientMessage:
          if (window)
            {
              if (!frame_was_receiver)
                meta_window_client_message (window, event);
            }
          else
            {
              MetaScreen *screen;

              screen = meta_display_screen_for_root (display,
                                                     event->xclient.window);
          
              if (screen)
                {
                  if (event->xclient.message_type ==
                      display->atom__NET_CURRENT_DESKTOP)
                    {
                      int space;
                      MetaWorkspace *workspace;
                      guint32 time;
              
                      space = event->xclient.data.l[0];
                      time = event->xclient.data.l[1];
              
                      meta_verbose ("Request to change current workspace to %d with "
                                    "specified timestamp of %u\n",
                                    space, time);

                      workspace =
                        meta_screen_get_workspace_by_index (screen,
                                                            space);

                      /* Handle clients using the older version of the spec... */
                      if (time == 0 && workspace)
                        {
                          meta_warning ("Received a NET_CURRENT_DESKTOP message "
                                        "from a broken (outdated) client who sent "
                                        "a 0 timestamp\n");
                          time = meta_display_get_current_time_roundtrip (display);
                        }

                      if (workspace)
                        meta_workspace_activate (workspace, time);
                      else
                        meta_verbose ("Don't know about workspace %d\n", space);
                    }
                  else if (event->xclient.message_type ==
                           display->atom__NET_NUMBER_OF_DESKTOPS)
                    {
                      int num_spaces;
              
                      num_spaces = event->xclient.data.l[0];
              
                      meta_verbose ("Request to set number of workspaces to %d\n",
                                    num_spaces);

                      meta_prefs_set_num_workspaces (num_spaces);
                    }
                  else if (event->xclient.message_type ==
                           display->atom__NET_SHOWING_DESKTOP)
                    {
                      gboolean showing_desktop;
                      guint32  timestamp;
                  
                      showing_desktop = event->xclient.data.l[0] != 0;
                      /* FIXME: Braindead protocol doesn't have a timestamp */
                      timestamp = meta_display_get_current_time_roundtrip (display);
                      meta_verbose ("Request to %s desktop\n",
                                    showing_desktop ? "show" : "hide");
                  
                      if (showing_desktop)
                        meta_screen_show_desktop (screen, timestamp);
                      else
                        {
                          meta_screen_unshow_desktop (screen);
                          meta_workspace_focus_default_window (screen->active_workspace, NULL, timestamp);
                        }
                    }
                  else if (event->xclient.message_type ==
                           display->atom_WM_PROTOCOLS) 
                    {
                      meta_verbose ("Received WM_PROTOCOLS message\n");
                  
                      if ((Atom)event->xclient.data.l[0] == display->atom__NET_WM_PING)
                        {
                          process_pong_message (display, event);

                          /* We don't want ping reply events going into
                           * the GTK+ event loop because gtk+ will treat
                           * them as ping requests and send more replies.
                           */
                          filter_out_event = TRUE;
                        }
                    }
                }

              if (event->xclient.message_type ==
                  display->atom__NET_REQUEST_FRAME_EXTENTS)
                {
                  meta_verbose ("Received _NET_REQUEST_FRAME_EXTENTS message\n");
                  process_request_frame_extents (display, event);
                }
            }
          break;
        case MappingNotify:
          {
            gboolean ignore_current;

            ignore_current = FALSE;
        
            /* Check whether the next event is an identical MappingNotify
             * event.  If it is, ignore the current event, we'll update
             * when we get the next one.
             */
            if (XPending (display->xdisplay))
              {
                XEvent next_event;
            
                XPeekEvent (display->xdisplay, &next_event);
            
                if (next_event.type == MappingNotify &&
                    next_event.xmapping.request == event->xmapping.request)
                  ignore_current = TRUE;
              }

            if (!ignore_current)
              {
                /* Let XLib know that there is a new keyboard mapping.
                 */
                XRefreshKeyboardMapping (&event->xmapping);
                meta_display_process_mapping_event (display, event);
              }
          }
          break;
        default:
#ifdef HAVE_XKB
          if (event->type == display->xkb_base_event_type)
            {
              XkbAnyEvent *xkb_ev = (XkbAnyEvent *) event;

              switch (xkb_ev->xkb_type)
                {
                case XkbBellNotify:
                  if (XSERVER_TIME_IS_BEFORE(display->last_bell_time,
                                             xkb_ev->time - 100))
                    {
                      display->last_bell_time = xkb_ev->time;
                      meta_bell_notify (display, xkb_ev);
                    }
                  break;
                case XkbNewKeyboardNotify:
                case XkbMapNotify:
                  if (xkb_ev->device == META_VIRTUAL_CORE_KEYBOARD_ID)
                    meta_display_process_mapping_event (display, event);
                  break;
                }
	    }
#endif
          break;
        }
    }

  if (display->compositor && !bypass_compositor)
    {
      if (meta_compositor_process_event (display->compositor,
                                         event,
                                         window))
        filter_out_event = TRUE;
    }
  
  display->current_time = CurrentTime;
  return filter_out_event;
}

static gboolean
event_callback (XEvent  *event,
                gpointer data)
{
  MetaDisplay *display = data;

  /* Under Wayland we want to filter out mouse motion events so we can
     synthesize them from the Clutter events instead. This is
     necessary because the position in the mouse events is passed to
     the X server relative to the position of the surface. The X
     server then translates these back to screen coordinates based on
     the window position. If we rely on this translatation when
     dragging a window around then the window will jump around
     erratically because of the lag between updating the window
     position from the surface position. Instead we bypass the
     translation altogether by directly using the Clutter events */
#ifdef HAVE_WAYLAND
  if (meta_is_wayland_compositor () &&
      event->type == GenericEvent &&
      event->xcookie.evtype == XI_Motion)
    return FALSE;
#endif

  return meta_display_handle_event (display, event);
}

/* Return the window this has to do with, if any, rather
 * than the frame or root window that was selecting
 * for substructure
 */
static Window
event_get_modified_window (MetaDisplay *display,
                           XEvent *event)
{
  XIEvent *input_event = get_input_event (display, event);

  if (input_event)
    {
      switch (input_event->evtype)
        {
        case XI_Motion:
        case XI_ButtonPress:
        case XI_ButtonRelease:
        case XI_KeyPress:
        case XI_KeyRelease:
          return ((XIDeviceEvent *) input_event)->event;
        case XI_FocusIn:
        case XI_FocusOut:
        case XI_Enter:
        case XI_Leave:
          return ((XIEnterEvent *) input_event)->event;
#ifdef HAVE_XI23
        case XI_BarrierHit:
        case XI_BarrierLeave:
          return ((XIBarrierEvent *) input_event)->event;
#endif /* HAVE_XI23 */
        }
    }

  switch (event->type)
    {
    case KeymapNotify:
    case Expose:
    case GraphicsExpose:
    case NoExpose:
    case VisibilityNotify:
    case ResizeRequest:
    case PropertyNotify:
    case SelectionClear:
    case SelectionRequest:
    case SelectionNotify:
    case ColormapNotify:
    case ClientMessage:
      return event->xany.window;
      
    case CreateNotify:
      return event->xcreatewindow.window;
      
    case DestroyNotify:
      return event->xdestroywindow.window;

    case UnmapNotify:
      return event->xunmap.window;

    case MapNotify:
      return event->xmap.window;

    case MapRequest:
      return event->xmaprequest.window;

    case ReparentNotify:
     return event->xreparent.window;
      
    case ConfigureNotify:
      return event->xconfigure.window;
      
    case ConfigureRequest:
      return event->xconfigurerequest.window;

    case GravityNotify:
      return event->xgravity.window;

    case CirculateNotify:
      return event->xcirculate.window;

    case CirculateRequest:
      return event->xcirculaterequest.window;

    case MappingNotify:
      return None;

    default:
#ifdef HAVE_SHAPE
      if (META_DISPLAY_HAS_SHAPE (display) && 
          event->type == (display->shape_event_base + ShapeNotify))
        {
          XShapeEvent *sev = (XShapeEvent*) event;
          return sev->window;
        }
#endif

      return None;
    }
}

static guint32
event_get_time (MetaDisplay *display,
                XEvent      *event)
{
  XIEvent *input_event = get_input_event (display, event);

  if (input_event)
    return input_event->time;

  switch (event->type)
    {
    case PropertyNotify:
      return event->xproperty.time;

    case SelectionClear:
    case SelectionRequest:
    case SelectionNotify:
      return event->xselection.time;

    case KeymapNotify:      
    case Expose:
    case GraphicsExpose:
    case NoExpose:
    case MapNotify:
    case UnmapNotify:
    case VisibilityNotify:
    case ResizeRequest:
    case ColormapNotify:
    case ClientMessage:
    case CreateNotify:
    case DestroyNotify:
    case MapRequest:
    case ReparentNotify:
    case ConfigureNotify:
    case ConfigureRequest:
    case GravityNotify:
    case CirculateNotify:
    case CirculateRequest:
    case MappingNotify:
    default:
      return CurrentTime;
    }
}

#ifdef WITH_VERBOSE_MODE
const char*
meta_event_detail_to_string (int d)
{
  const char *detail = "???";
  switch (d)
    {
      /* We are an ancestor in the A<->B focus change relationship */
    case XINotifyAncestor:
      detail = "NotifyAncestor";
      break;
    case XINotifyDetailNone:
      detail = "NotifyDetailNone";
      break;
      /* We are a descendant in the A<->B focus change relationship */
    case XINotifyInferior:
      detail = "NotifyInferior";
      break;
    case XINotifyNonlinear:
      detail = "NotifyNonlinear";
      break;
    case XINotifyNonlinearVirtual:
      detail = "NotifyNonlinearVirtual";
      break;
    case XINotifyPointer:
      detail = "NotifyPointer";
      break;
    case XINotifyPointerRoot:
      detail = "NotifyPointerRoot";
      break;
    case XINotifyVirtual:
      detail = "NotifyVirtual";
      break;
    }

  return detail;
}
#endif /* WITH_VERBOSE_MODE */

#ifdef WITH_VERBOSE_MODE
const char*
meta_event_mode_to_string (int m)
{
  const char *mode = "???";
  switch (m)
    {
    case XINotifyNormal:
      mode = "NotifyNormal";
      break;
    case XINotifyGrab:
      mode = "NotifyGrab";
      break;
    case XINotifyUngrab:
      mode = "NotifyUngrab";
      break;
    case XINotifyWhileGrabbed:
      mode = "NotifyWhileGrabbed";
      break;
    }

  return mode;
}
#endif /* WITH_VERBOSE_MODE */

#ifdef WITH_VERBOSE_MODE
static const char*
stack_mode_to_string (int mode)
{
  switch (mode)
    {
    case Above:
      return "Above";
    case Below:
      return "Below";
    case TopIf:
      return "TopIf";
    case BottomIf:
      return "BottomIf";
    case Opposite:
      return "Opposite";      
    }

  return "Unknown";
}
#endif /* WITH_VERBOSE_MODE */

#ifdef HAVE_XSYNC
#ifdef WITH_VERBOSE_MODE
static gint64
sync_value_to_64 (const XSyncValue *value)
{
  gint64 v;

  v = XSyncValueLow32 (*value);
  v |= (((gint64)XSyncValueHigh32 (*value)) << 32);
  
  return v;
}
#endif /* WITH_VERBOSE_MODE */

#ifdef WITH_VERBOSE_MODE
static const char*
alarm_state_to_string (XSyncAlarmState state)
{
  switch (state)
    {
    case XSyncAlarmActive:
      return "Active";
    case XSyncAlarmInactive:
      return "Inactive";
    case XSyncAlarmDestroyed:
      return "Destroyed";
    default:
      return "(unknown)";
    }
}
#endif /* WITH_VERBOSE_MODE */

#endif /* HAVE_XSYNC */

#ifdef WITH_VERBOSE_MODE
static void
meta_spew_xi2_event (MetaDisplay *display,
                     XIEvent     *input_event,
                     const char **name_p,
                     char       **extra_p)
{
  const char *name = NULL;
  char *extra = NULL;

  XIDeviceEvent *device_event = (XIDeviceEvent *) input_event;
  XIEnterEvent *enter_event = (XIEnterEvent *) input_event;

  switch (input_event->evtype)
    {
    case XI_Motion:
      name = "XI_Motion";
      break;
    case XI_ButtonPress:
      name = "XI_ButtonPress";
      break;
    case XI_ButtonRelease:
      name = "XI_ButtonRelease";
      break;
    case XI_KeyPress:
      name = "XI_KeyPress";
      break;
    case XI_KeyRelease:
      name = "XI_KeyRelease";
      break;
    case XI_FocusIn:
      name = "XI_FocusIn";
      break;
    case XI_FocusOut:
      name = "XI_FocusOut";
      break;
    case XI_Enter:
      name = "XI_Enter";
      break;
    case XI_Leave:
      name = "XI_Leave";
      break;
#ifdef HAVE_XI23
    case XI_BarrierHit:
      name = "XI_BarrierHit";
      break;
    case XI_BarrierLeave:
      name = "XI_BarrierLeave";
      break;
#endif /* HAVE_XI23 */
    }

  switch (input_event->evtype)
    {
    case XI_Motion:
      extra = g_strdup_printf ("win: 0x%lx x: %g y: %g",
                               device_event->event,
                               device_event->root_x,
                               device_event->root_y);
      break;
    case XI_ButtonPress:
    case XI_ButtonRelease:
      extra = g_strdup_printf ("button %u x %g y %g root 0x%lx",
                               device_event->detail,
                               device_event->root_x,
                               device_event->root_y,
                               device_event->root);
      break;
    case XI_KeyPress:
    case XI_KeyRelease:
      {
        KeySym keysym;
        const char *str;
  
        keysym = XKeycodeToKeysym (display->xdisplay, device_event->detail, 0);

        str = XKeysymToString (keysym);

        extra = g_strdup_printf ("Key '%s' state 0x%x",
                                 str ? str : "none", device_event->mods.effective);
      }
      break;
    case XI_FocusIn:
    case XI_FocusOut:
      extra = g_strdup_printf ("detail: %s mode: %s\n",
                               meta_event_detail_to_string (enter_event->detail),
                               meta_event_mode_to_string (enter_event->mode));
      break;
    case XI_Enter:
    case XI_Leave:
      extra = g_strdup_printf ("win: 0x%lx root: 0x%lx mode: %s detail: %s focus: %d x: %g y: %g",
                               enter_event->event,
                               enter_event->root,
                               meta_event_mode_to_string (enter_event->mode),
                               meta_event_detail_to_string (enter_event->detail),
                               enter_event->focus,
                               enter_event->root_x,
                               enter_event->root_y);
      break;
    }

  *name_p = name;
  *extra_p = extra;
}

static void
meta_spew_core_event (MetaDisplay *display,
                      XEvent      *event,
                      const char **name_p,
                      char       **extra_p)
{
  const char *name = NULL;
  char *extra = NULL;

  switch (event->type)
    {
    case KeymapNotify:
      name = "KeymapNotify";
      break;
    case Expose:
      name = "Expose";
      break;
    case GraphicsExpose:
      name = "GraphicsExpose";
      break;
    case NoExpose:
      name = "NoExpose";
      break;
    case VisibilityNotify:
      name = "VisibilityNotify";
      break;
    case CreateNotify:
      name = "CreateNotify";
      extra = g_strdup_printf ("parent: 0x%lx window: 0x%lx",
                               event->xcreatewindow.parent,
                               event->xcreatewindow.window);
      break;
    case DestroyNotify:
      name = "DestroyNotify";
      extra = g_strdup_printf ("event: 0x%lx window: 0x%lx",
                               event->xdestroywindow.event,
                               event->xdestroywindow.window);
      break;
    case UnmapNotify:
      name = "UnmapNotify";
      extra = g_strdup_printf ("event: 0x%lx window: 0x%lx from_configure: %d",
                               event->xunmap.event,
                               event->xunmap.window,
                               event->xunmap.from_configure);
      break;
    case MapNotify:
      name = "MapNotify";
      extra = g_strdup_printf ("event: 0x%lx window: 0x%lx override_redirect: %d",
                               event->xmap.event,
                               event->xmap.window,
                               event->xmap.override_redirect);
      break;
    case MapRequest:
      name = "MapRequest";
      extra = g_strdup_printf ("window: 0x%lx parent: 0x%lx\n",
                               event->xmaprequest.window,
                               event->xmaprequest.parent);
      break;
    case ReparentNotify:
      name = "ReparentNotify";
      extra = g_strdup_printf ("window: 0x%lx parent: 0x%lx event: 0x%lx\n",
                               event->xreparent.window,
                               event->xreparent.parent,
                               event->xreparent.event);
      break;
    case ConfigureNotify:
      name = "ConfigureNotify";
      extra = g_strdup_printf ("x: %d y: %d w: %d h: %d above: 0x%lx override_redirect: %d",
                               event->xconfigure.x,
                               event->xconfigure.y,
                               event->xconfigure.width,
                               event->xconfigure.height,
                               event->xconfigure.above,
                               event->xconfigure.override_redirect);
      break;
    case ConfigureRequest:
      name = "ConfigureRequest";
      extra = g_strdup_printf ("parent: 0x%lx window: 0x%lx x: %d %sy: %d %sw: %d %sh: %d %sborder: %d %sabove: %lx %sstackmode: %s %s",
                               event->xconfigurerequest.parent,
                               event->xconfigurerequest.window,
                               event->xconfigurerequest.x,
                               event->xconfigurerequest.value_mask &
                               CWX ? "" : "(unset) ",
                               event->xconfigurerequest.y,
                               event->xconfigurerequest.value_mask &
                               CWY ? "" : "(unset) ",
                               event->xconfigurerequest.width,
                               event->xconfigurerequest.value_mask &
                               CWWidth ? "" : "(unset) ",
                               event->xconfigurerequest.height,
                               event->xconfigurerequest.value_mask &
                               CWHeight ? "" : "(unset) ",
                               event->xconfigurerequest.border_width,
                               event->xconfigurerequest.value_mask &
                               CWBorderWidth ? "" : "(unset)",
                               event->xconfigurerequest.above,
                               event->xconfigurerequest.value_mask &
                               CWSibling ? "" : "(unset)",
                               stack_mode_to_string (event->xconfigurerequest.detail),
                               event->xconfigurerequest.value_mask &
                               CWStackMode ? "" : "(unset)");
      break;
    case GravityNotify:
      name = "GravityNotify";
      break;
    case ResizeRequest:
      name = "ResizeRequest";
      extra = g_strdup_printf ("width = %d height = %d",
                               event->xresizerequest.width,
                               event->xresizerequest.height);
      break;
    case CirculateNotify:
      name = "CirculateNotify";
      break;
    case CirculateRequest:
      name = "CirculateRequest";
      break;
    case PropertyNotify:
      {
        char *str;
        const char *state;
            
        name = "PropertyNotify";
            
        meta_error_trap_push (display);
        str = XGetAtomName (display->xdisplay,
                            event->xproperty.atom);
        meta_error_trap_pop (display);

        if (event->xproperty.state == PropertyNewValue)
          state = "PropertyNewValue";
        else if (event->xproperty.state == PropertyDelete)
          state = "PropertyDelete";
        else
          state = "???";
            
        extra = g_strdup_printf ("atom: %s state: %s",
                                 str ? str : "(unknown atom)",
                                 state);
        meta_XFree (str);
      }
      break;
    case SelectionClear:
      name = "SelectionClear";
      break;
    case SelectionRequest:
      name = "SelectionRequest";
      break;
    case SelectionNotify:
      name = "SelectionNotify";
      break;
    case ColormapNotify:
      name = "ColormapNotify";
      break;
    case ClientMessage:
      {
        char *str;
        name = "ClientMessage";
        meta_error_trap_push (display);
        str = XGetAtomName (display->xdisplay,
                            event->xclient.message_type);
        meta_error_trap_pop (display);
        extra = g_strdup_printf ("type: %s format: %d\n",
                                 str ? str : "(unknown atom)",
                                 event->xclient.format);
        meta_XFree (str);
      }
      break;
    case MappingNotify:
      name = "MappingNotify";
      break;
    default:
#ifdef HAVE_XSYNC
      if (META_DISPLAY_HAS_XSYNC (display) && 
          event->type == (display->xsync_event_base + XSyncAlarmNotify))
        {
          XSyncAlarmNotifyEvent *aevent = (XSyncAlarmNotifyEvent*) event;
          
          name = "XSyncAlarmNotify";
          extra =
            g_strdup_printf ("alarm: 0x%lx"
                             " counter_value: %" G_GINT64_FORMAT
                             " alarm_value: %" G_GINT64_FORMAT
                             " time: %u alarm state: %s",
                             aevent->alarm,
                             (gint64) sync_value_to_64 (&aevent->counter_value),
                             (gint64) sync_value_to_64 (&aevent->alarm_value),
                             (unsigned int)aevent->time,
                             alarm_state_to_string (aevent->state));
        }
      else
#endif /* HAVE_XSYNC */
#ifdef HAVE_SHAPE
        if (META_DISPLAY_HAS_SHAPE (display) && 
            event->type == (display->shape_event_base + ShapeNotify))
          {
            XShapeEvent *sev = (XShapeEvent*) event;

            name = "ShapeNotify";

            extra =
              g_strdup_printf ("kind: %s "
                               "x: %d y: %d w: %u h: %u "
                               "shaped: %d",
                               sev->kind == ShapeBounding ?
                               "ShapeBounding" :
                               (sev->kind == ShapeClip ?
                                "ShapeClip" : "(unknown)"),
                               sev->x, sev->y, sev->width, sev->height,
                               sev->shaped);
          }
        else
#endif /* HAVE_SHAPE */      
          {
            name = "(Unknown event)";
            extra = g_strdup_printf ("type: %d", event->xany.type);
          }
      break;
    }

  *name_p = name;
  *extra_p = extra;
}

static void
meta_spew_event (MetaDisplay *display,
                 XEvent      *event)
{
  const char *name = NULL;
  char *extra = NULL;
  char *winname;
  MetaScreen *screen;
  XIEvent *input_event;

  if (!meta_is_verbose())
    return;
  
  /* filter overnumerous events */
  if (event->type == Expose || event->type == MotionNotify ||
      event->type == NoExpose)
    return;

  if (event->type == (display->damage_event_base + XDamageNotify))
    return;

  if (event->type == (display->xsync_event_base + XSyncAlarmNotify))
    return;

  if (event->type == PropertyNotify && event->xproperty.atom == display->atom__NET_WM_USER_TIME)
    return;

  input_event = get_input_event (display, event);

  if (input_event)
    meta_spew_xi2_event (display, input_event, &name, &extra);
  else
    meta_spew_core_event (display, event, &name, &extra);

  screen = meta_display_screen_for_root (display, event->xany.window);
      
  if (screen)
    winname = g_strdup_printf ("root %d", screen->number);
  else
    winname = g_strdup_printf ("0x%lx", event->xany.window);

  meta_topic (META_DEBUG_EVENTS,
              "%s on %s%s %s %sserial %lu\n", name, winname,
              extra ? ":" : "", extra ? extra : "",
              event->xany.send_event ? "SEND " : "",
              event->xany.serial);

  g_free (winname);

  if (extra)
    g_free (extra);
}
#endif /* WITH_VERBOSE_MODE */

MetaWindow*
meta_display_lookup_x_window (MetaDisplay *display,
                              Window       xwindow)
{
  return g_hash_table_lookup (display->xids, &xwindow);
}

void
meta_display_register_x_window (MetaDisplay *display,
                                Window      *xwindowp,
                                MetaWindow  *window)
{
  g_return_if_fail (g_hash_table_lookup (display->xids, xwindowp) == NULL);
  
  g_hash_table_insert (display->xids, xwindowp, window);
}

void
meta_display_unregister_x_window (MetaDisplay *display,
                                  Window       xwindow)
{
  g_return_if_fail (g_hash_table_lookup (display->xids, &xwindow) != NULL);

  g_hash_table_remove (display->xids, &xwindow);

  /* Remove any pending pings */
  remove_pending_pings_for_window (display, xwindow);
}

#ifdef HAVE_XSYNC
/* We store sync alarms in the window ID hash table, because they are
 * just more types of XIDs in the same global space, but we have
 * typesafe functions to register/unregister for readability.
 */

MetaWindow*
meta_display_lookup_sync_alarm (MetaDisplay *display,
                                XSyncAlarm   alarm)
{
  return g_hash_table_lookup (display->xids, &alarm);
}

void
meta_display_register_sync_alarm (MetaDisplay *display,
                                  XSyncAlarm  *alarmp,
                                  MetaWindow  *window)
{
  g_return_if_fail (g_hash_table_lookup (display->xids, alarmp) == NULL);

  g_hash_table_insert (display->xids, alarmp, window);
}

void
meta_display_unregister_sync_alarm (MetaDisplay *display,
                                    XSyncAlarm   alarm)
{
  g_return_if_fail (g_hash_table_lookup (display->xids, &alarm) != NULL);

  g_hash_table_remove (display->xids, &alarm);
}
#endif /* HAVE_XSYNC */

void
meta_display_notify_window_created (MetaDisplay  *display,
                                    MetaWindow   *window)
{
  g_signal_emit (display, display_signals[WINDOW_CREATED], 0, window);
}

/**
 * meta_display_xwindow_is_a_no_focus_window:
 * @display: A #MetaDisplay
 * @xwindow: An X11 window
 *
 * Returns: %TRUE iff window is one of mutter's internal "no focus" windows
 * (there is one per screen) which will have the focus when there is no
 * actual client window focused.
 */
gboolean
meta_display_xwindow_is_a_no_focus_window (MetaDisplay *display,
                                           Window xwindow)
{
  gboolean is_a_no_focus_window = FALSE;
  GSList *temp = display->screens;
  while (temp != NULL) {
    MetaScreen *screen = temp->data;
    if (screen->no_focus_window == xwindow) {
      is_a_no_focus_window = TRUE;
      break;
    }
    temp = temp->next;
  }

  return is_a_no_focus_window;
}

Cursor
meta_display_create_x_cursor (MetaDisplay *display,
                              MetaCursor cursor)
{
  Cursor xcursor;
  guint glyph;

  switch (cursor)
    {
    case META_CURSOR_DEFAULT:
      glyph = XC_left_ptr;
      break;
    case META_CURSOR_NORTH_RESIZE:
      glyph = XC_top_side;
      break;
    case META_CURSOR_SOUTH_RESIZE:
      glyph = XC_bottom_side;
      break;
    case META_CURSOR_WEST_RESIZE:
      glyph = XC_left_side;
      break;
    case META_CURSOR_EAST_RESIZE:
      glyph = XC_right_side;
      break;
    case META_CURSOR_SE_RESIZE:
      glyph = XC_bottom_right_corner;
      break;
    case META_CURSOR_SW_RESIZE:
      glyph = XC_bottom_left_corner;
      break;
    case META_CURSOR_NE_RESIZE:
      glyph = XC_top_right_corner;
      break;
    case META_CURSOR_NW_RESIZE:
      glyph = XC_top_left_corner;
      break;
    case META_CURSOR_MOVE_OR_RESIZE_WINDOW:
      glyph = XC_fleur;
      break;
    case META_CURSOR_BUSY:
      glyph = XC_watch;
      break;
      
    default:
      g_assert_not_reached ();
      glyph = 0; /* silence compiler */
      break;
    }
  
  xcursor = XCreateFontCursor (display->xdisplay, glyph);

  return xcursor;
}

static Cursor
xcursor_for_op (MetaDisplay *display,
                MetaGrabOp   op)
{
  MetaCursor cursor = META_CURSOR_DEFAULT;
  
  switch (op)
    {
    case META_GRAB_OP_RESIZING_SE:
    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
      cursor = META_CURSOR_SE_RESIZE;
      break;
    case META_GRAB_OP_RESIZING_S:
    case META_GRAB_OP_KEYBOARD_RESIZING_S:
      cursor = META_CURSOR_SOUTH_RESIZE;
      break;
    case META_GRAB_OP_RESIZING_SW:
    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
      cursor = META_CURSOR_SW_RESIZE;
      break;
    case META_GRAB_OP_RESIZING_N:
    case META_GRAB_OP_KEYBOARD_RESIZING_N:
      cursor = META_CURSOR_NORTH_RESIZE;
      break;
    case META_GRAB_OP_RESIZING_NE:
    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
      cursor = META_CURSOR_NE_RESIZE;
      break;
    case META_GRAB_OP_RESIZING_NW:
    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
      cursor = META_CURSOR_NW_RESIZE;
      break;
    case META_GRAB_OP_RESIZING_W:
    case META_GRAB_OP_KEYBOARD_RESIZING_W:
      cursor = META_CURSOR_WEST_RESIZE;
      break;
    case META_GRAB_OP_RESIZING_E:
    case META_GRAB_OP_KEYBOARD_RESIZING_E:
      cursor = META_CURSOR_EAST_RESIZE;
      break;
    case META_GRAB_OP_MOVING:
    case META_GRAB_OP_KEYBOARD_MOVING:
    case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
      cursor = META_CURSOR_MOVE_OR_RESIZE_WINDOW;
      break;
      
    default:
      break;
    }

  if (cursor == META_CURSOR_DEFAULT)
    return None;
  return meta_display_create_x_cursor (display, cursor);
}

void
meta_display_set_grab_op_cursor (MetaDisplay *display,
                                 MetaScreen  *screen,
                                 MetaGrabOp   op,
                                 Window       grab_xwindow,
                                 guint32      timestamp)
{
  Cursor cursor = xcursor_for_op (display, op);
  unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
  XIEventMask mask = { XIAllMasterDevices, sizeof (mask_bits), mask_bits };

  XISetMask (mask.mask, XI_ButtonPress);
  XISetMask (mask.mask, XI_ButtonRelease);
  XISetMask (mask.mask, XI_Enter);
  XISetMask (mask.mask, XI_Leave);
  XISetMask (mask.mask, XI_Motion);

  g_assert (screen != NULL);

  meta_error_trap_push (display);
  if (XIGrabDevice (display->xdisplay,
                    META_VIRTUAL_CORE_POINTER_ID,
                    grab_xwindow,
                    timestamp,
                    cursor,
                    XIGrabModeAsync, XIGrabModeAsync,
                    False, /* owner_events */
                    &mask) == Success)
    {
      display->grab_have_pointer = TRUE;
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "XIGrabDevice() returned GrabSuccess time %u\n",
                  timestamp);
    }
  else
    {
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "XIGrabDevice() failed time %u\n",
                  timestamp);
    }
  meta_error_trap_pop (display);
  
  if (cursor != None)
    XFreeCursor (display->xdisplay, cursor);
}

gboolean
meta_display_begin_grab_op (MetaDisplay *display,
			    MetaScreen  *screen,
                            MetaWindow  *window,
                            MetaGrabOp   op,
                            gboolean     pointer_already_grabbed,
                            gboolean     frame_action,
                            int          button,
                            gulong       modmask,
                            guint32      timestamp,
                            int          root_x,
                            int          root_y)
{
  MetaWindow *grab_window = NULL;
  Window grab_xwindow;
  
  meta_topic (META_DEBUG_WINDOW_OPS,
              "Doing grab op %u on window %s button %d pointer already grabbed: %d pointer pos %d,%d\n",
              op, window ? window->desc : "none", button, pointer_already_grabbed,
              root_x, root_y);
  
  if (display->grab_op != META_GRAB_OP_NONE)
    {
      if (window)
        meta_warning ("Attempt to perform window operation %u on window %s when operation %u on %s already in effect\n",
                      op, window->desc, display->grab_op,
                      display->grab_window ? display->grab_window->desc : "none");
      return FALSE;
    }

  if (window &&
      (meta_grab_op_is_moving (op) || meta_grab_op_is_resizing (op)))
    {
      if (meta_prefs_get_raise_on_click ())
        meta_window_raise (window);
      else
        {
          display->grab_initial_x = root_x;
          display->grab_initial_y = root_y;
          display->grab_threshold_movement_reached = FALSE;
        }
    }

  /* If window is a modal dialog attached to its parent,
   * grab the parent instead for moving.
   */
  if (window && meta_window_is_attached_dialog (window) &&
      meta_grab_op_is_moving (op))
    grab_window = meta_window_get_transient_for (window);

  if (grab_window == NULL)
    grab_window = window;

  /* FIXME:
   *   If we have no MetaWindow we do our best
   *   and try to do the grab on the RootWindow.
   *   This will fail if anyone else has any
   *   key grab on the RootWindow.
   */
  if (grab_window)
    grab_xwindow = grab_window->frame ? grab_window->frame->xwindow : grab_window->xwindow;
  else
    grab_xwindow = screen->xroot;

  display->grab_have_pointer = FALSE;
  
  if (pointer_already_grabbed)
    display->grab_have_pointer = TRUE;
  
  meta_display_set_grab_op_cursor (display, screen, op, grab_xwindow, timestamp);

  if (!display->grab_have_pointer && !grab_op_is_keyboard (op))
    {
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "XIGrabDevice() failed\n");
      return FALSE;
    }

  /* Grab keys for keyboard ops and mouse move/resizes; see #126497 */
  if (grab_op_is_keyboard (op) || grab_op_is_mouse_only (op))
    {
      if (grab_window)
        display->grab_have_keyboard =
                     meta_window_grab_all_keys (grab_window, timestamp);

      else
        display->grab_have_keyboard =
                     meta_screen_grab_all_keys (screen, timestamp);
      
      if (!display->grab_have_keyboard)
        {
          meta_topic (META_DEBUG_WINDOW_OPS,
                      "grabbing all keys failed, ungrabbing pointer\n");
          XIUngrabDevice (display->xdisplay, META_VIRTUAL_CORE_POINTER_ID, timestamp);
          display->grab_have_pointer = FALSE;
          return FALSE;
        }
    }
  
  display->grab_op = op;
  display->grab_window = grab_window;
  display->grab_screen = screen;
  display->grab_xwindow = grab_xwindow;
  display->grab_button = button;
  display->grab_mask = modmask;
  if (window)
    {
      display->grab_tile_mode = window->tile_mode;
      display->grab_tile_monitor_number = window->tile_monitor_number;
    }
  else
    {
      display->grab_tile_mode = META_TILE_NONE;
      display->grab_tile_monitor_number = -1;
    }
  display->grab_anchor_root_x = root_x;
  display->grab_anchor_root_y = root_y;
  display->grab_latest_motion_x = root_x;
  display->grab_latest_motion_y = root_y;
  display->grab_last_moveresize_time.tv_sec = 0;
  display->grab_last_moveresize_time.tv_usec = 0;
  display->grab_motion_notify_time = 0;
  display->grab_old_window_stacking = NULL;
#ifdef HAVE_XSYNC
  display->grab_last_user_action_was_snap = FALSE;
#endif
  display->grab_frame_action = frame_action;
  display->grab_resize_unmaximize = 0;
  display->grab_timestamp = timestamp;

  if (display->grab_resize_timeout_id)
    {
      g_source_remove (display->grab_resize_timeout_id);
      display->grab_resize_timeout_id = 0;
    }
	
  if (display->grab_window)
    {
      meta_window_get_client_root_coords (display->grab_window,
                                          &display->grab_initial_window_pos);
      display->grab_anchor_window_pos = display->grab_initial_window_pos;

#ifdef HAVE_XSYNC
      if ( meta_grab_op_is_resizing (display->grab_op) &&
           display->grab_window->sync_request_counter != None)
        {
          meta_window_create_sync_request_alarm (display->grab_window);
        }
#endif
    }
  
  meta_topic (META_DEBUG_WINDOW_OPS,
              "Grab op %u on window %s successful\n",
              display->grab_op, window ? window->desc : "(null)");

  g_assert (display->grab_window != NULL || display->grab_screen != NULL);
  g_assert (display->grab_op != META_GRAB_OP_NONE);

  /* Save the old stacking */
  if (GRAB_OP_IS_WINDOW_SWITCH (display->grab_op))
    {
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "Saving old stack positions; old pointer was %p.\n",
                  display->grab_old_window_stacking);
      display->grab_old_window_stacking = 
        meta_stack_get_positions (screen->stack);
    }

  if (display->grab_window)
    {
      meta_window_refresh_resize_popup (display->grab_window);
    }

  g_signal_emit (display, display_signals[GRAB_OP_BEGIN], 0,
                 screen, display->grab_window, display->grab_op);
  
  return TRUE;
}

void
meta_display_end_grab_op (MetaDisplay *display,
                          guint32      timestamp)
{
  meta_topic (META_DEBUG_WINDOW_OPS,
              "Ending grab op %u at time %u\n", display->grab_op, timestamp);
  
  if (display->grab_op == META_GRAB_OP_NONE)
    return;

  g_signal_emit (display, display_signals[GRAB_OP_END], 0,
                 display->grab_screen, display->grab_window, display->grab_op);

  if (display->grab_window != NULL)
    display->grab_window->shaken_loose = FALSE;
  
  if (display->grab_window != NULL &&
      !meta_prefs_get_raise_on_click () &&
      (meta_grab_op_is_moving (display->grab_op) ||
       meta_grab_op_is_resizing (display->grab_op)))
    {
      /* Only raise the window in orthogonal raise
       * ('do-not-raise-on-click') mode if the user didn't try to move
       * or resize the given window by at least a threshold amount.
       * For raise on click mode, the window was raised at the
       * beginning of the grab_op.
       */
      if (!display->grab_threshold_movement_reached)
        meta_window_raise (display->grab_window);
    }

  if (GRAB_OP_IS_WINDOW_SWITCH (display->grab_op) ||
      display->grab_op == META_GRAB_OP_KEYBOARD_WORKSPACE_SWITCHING)
    {
      if (GRAB_OP_IS_WINDOW_SWITCH (display->grab_op))
        meta_screen_tab_popup_destroy (display->grab_screen);
      else
        meta_screen_workspace_popup_destroy (display->grab_screen);

      /* If the ungrab here causes an EnterNotify, ignore it for
       * sloppy focus
       */
      display->ungrab_should_not_cause_focus_window = display->grab_xwindow;
    }
  
  /* If this was a move or resize clear out the edge cache */
  if (meta_grab_op_is_resizing (display->grab_op) || 
      meta_grab_op_is_moving (display->grab_op))
    {
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "Clearing out the edges for resistance/snapping");
      meta_display_cleanup_edges (display);
    }

  if (display->grab_old_window_stacking != NULL)
    {
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "Clearing out the old stack position, which was %p.\n",
                  display->grab_old_window_stacking);
      g_list_free (display->grab_old_window_stacking);
      display->grab_old_window_stacking = NULL;
    }

  if (display->grab_have_pointer)
    {
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "Ungrabbing pointer with timestamp %u\n", timestamp);
      XIUngrabDevice (display->xdisplay, META_VIRTUAL_CORE_POINTER_ID, timestamp);
    }

  if (display->grab_have_keyboard)
    {
      meta_topic (META_DEBUG_WINDOW_OPS,
                  "Ungrabbing all keys timestamp %u\n", timestamp);
      if (display->grab_window)
        meta_window_ungrab_all_keys (display->grab_window, timestamp);
      else
        meta_screen_ungrab_all_keys (display->grab_screen, timestamp);
    }

  
  display->grab_timestamp = 0;
  display->grab_window = NULL;
  display->grab_screen = NULL;
  display->grab_xwindow = None;
  display->grab_tile_mode = META_TILE_NONE;
  display->grab_tile_monitor_number = -1;
  display->grab_op = META_GRAB_OP_NONE;

  if (display->grab_resize_popup)
    {
      meta_ui_resize_popup_free (display->grab_resize_popup);
      display->grab_resize_popup = NULL;
    }

  if (display->grab_resize_timeout_id)
    {
      g_source_remove (display->grab_resize_timeout_id);
      display->grab_resize_timeout_id = 0;
    }
}

/**
 * meta_display_get_grab_op:
 * @display: The #MetaDisplay that the window is on

 * Gets the current grab operation, if any.
 *
 * Return value: the current grab operation, or %META_GRAB_OP_NONE if
 * Mutter doesn't currently have a grab. %META_GRAB_OP_COMPOSITOR will
 * be returned if a compositor-plugin modal operation is in effect
 * (See mutter_begin_modal_for_plugin())
 */
MetaGrabOp
meta_display_get_grab_op (MetaDisplay *display)
{
  return display->grab_op;
}

void
meta_display_check_threshold_reached (MetaDisplay *display,
                                      int          x,
                                      int          y)
{
  /* Don't bother doing the check again if we've already reached the threshold */
  if (meta_prefs_get_raise_on_click () ||
      display->grab_threshold_movement_reached)
    return;

  if (ABS (display->grab_initial_x - x) >= 8 ||
      ABS (display->grab_initial_y - y) >= 8)
    display->grab_threshold_movement_reached = TRUE;
}

static void
meta_change_button_grab (MetaDisplay *display,
                         Window       xwindow,
                         gboolean     grab,
                         gboolean     sync,
                         int          button,
                         int          modmask)
{
  unsigned int ignored_mask;

  unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
  XIEventMask mask = { XIAllMasterDevices, sizeof (mask_bits), mask_bits };

  XISetMask (mask.mask, XI_ButtonPress);
  XISetMask (mask.mask, XI_ButtonRelease);
  XISetMask (mask.mask, XI_Motion);

  meta_verbose ("%s 0x%lx sync = %d button = %d modmask 0x%x\n",
                grab ? "Grabbing" : "Ungrabbing",
                xwindow,
                sync, button, modmask);
  
  meta_error_trap_push (display);
  
  ignored_mask = 0;
  while (ignored_mask <= display->ignored_modifier_mask)
    {
      XIGrabModifiers mods;

      if (ignored_mask & ~(display->ignored_modifier_mask))
        {
          /* Not a combination of ignored modifiers
           * (it contains some non-ignored modifiers)
           */
          ++ignored_mask;
          continue;
        }

      mods = (XIGrabModifiers) { modmask | ignored_mask, 0 };

      if (meta_is_debugging ())
        meta_error_trap_push_with_return (display);

      /* GrabModeSync means freeze until XAllowEvents */
      
      if (grab)
        XIGrabButton (display->xdisplay,
                      META_VIRTUAL_CORE_POINTER_ID,
                      button, xwindow, None,
                      sync ? XIGrabModeSync : XIGrabModeAsync,
                      XIGrabModeAsync, False,
                      &mask, 1, &mods);
      else
        XIUngrabButton (display->xdisplay,
                        META_VIRTUAL_CORE_POINTER_ID,
                        button, xwindow, 1, &mods);

      if (meta_is_debugging ())
        {
          int result;
          
          result = meta_error_trap_pop_with_return (display);
          
          if (result != Success)
            meta_verbose ("Failed to %s button %d with mask 0x%x for window 0x%lx error code %d\n",
                          grab ? "grab" : "ungrab",
                          button, modmask | ignored_mask, xwindow, result);
        }
      
      ++ignored_mask;
    }

  meta_error_trap_pop (display);
}

void
meta_display_grab_window_buttons (MetaDisplay *display,
                                  Window       xwindow)
{  
  /* Grab Alt + button1 for moving window.
   * Grab Alt + button2 for resizing window.
   * Grab Alt + button3 for popping up window menu.
   * Grab Alt + Shift + button1 for snap-moving window.
   */
  meta_verbose ("Grabbing window buttons for 0x%lx\n", xwindow);
  
  /* FIXME If we ignored errors here instead of spewing, we could
   * put one big error trap around the loop and avoid a bunch of
   * XSync()
   */

  if (display->window_grab_modifiers != 0)
    {
      gboolean debug = g_getenv ("MUTTER_DEBUG_BUTTON_GRABS") != NULL;
      int i;
      for (i = 1; i < 4; i++)
        {
          meta_change_button_grab (display, xwindow,
                                   TRUE,
                                   FALSE,
                                   i, display->window_grab_modifiers);  
          
          /* This is for debugging, since I end up moving the Xnest
           * otherwise ;-)
           */
          if (debug)
            meta_change_button_grab (display, xwindow,
                                     TRUE,
                                     FALSE,
                                     i, ControlMask);
        }

      /* In addition to grabbing Alt+Button1 for moving the window,
       * grab Alt+Shift+Button1 for snap-moving the window.  See bug
       * 112478.  Unfortunately, this doesn't work with
       * Shift+Alt+Button1 for some reason; so at least part of the
       * order still matters, which sucks (please FIXME).
       */
      meta_change_button_grab (display, xwindow,
                               TRUE,
                               FALSE,
                               1, display->window_grab_modifiers | ShiftMask);
    }
}

void
meta_display_ungrab_window_buttons  (MetaDisplay *display,
                                     Window       xwindow)
{
  gboolean debug;
  int i;

  if (display->window_grab_modifiers == 0)
    return;
  
  debug = g_getenv ("MUTTER_DEBUG_BUTTON_GRABS") != NULL;
  i = 1;
  while (i < 4)
    {
      meta_change_button_grab (display, xwindow,
                               FALSE, FALSE, i,
                               display->window_grab_modifiers);
      
      if (debug)
        meta_change_button_grab (display, xwindow,
                                 FALSE, FALSE, i, ControlMask);
      
      ++i;
    }
}

/* Grab buttons we only grab while unfocused in click-to-focus mode */
#define MAX_FOCUS_BUTTON 4
void
meta_display_grab_focus_window_button (MetaDisplay *display,
                                       MetaWindow  *window)
{
  /* Grab button 1 for activating unfocused windows */
  meta_verbose ("Grabbing unfocused window buttons for %s\n", window->desc);

#if 0
  /* FIXME:115072 */
  /* Don't grab at all unless in click to focus mode. In click to
   * focus, we may sometimes be clever about intercepting and eating
   * the focus click. But in mouse focus, we never do that since the
   * focus window may not be raised, and who wants to think about
   * mouse focus anyway.
   */
  if (meta_prefs_get_focus_mode () != G_DESKTOP_FOCUS_MODE_CLICK)
    {
      meta_verbose (" (well, not grabbing since not in click to focus mode)\n");
      return;
    }
#endif
  
  if (window->have_focus_click_grab)
    {
      meta_verbose (" (well, not grabbing since we already have the grab)\n");
      return;
    }
  
  /* FIXME If we ignored errors here instead of spewing, we could
   * put one big error trap around the loop and avoid a bunch of
   * XSync()
   */
  
  {
    int i = 1;
    while (i < MAX_FOCUS_BUTTON)
      {
        meta_change_button_grab (display,
                                 window->xwindow,
                                 TRUE, TRUE,
                                 i, 0);
        
        ++i;
      }

    window->have_focus_click_grab = TRUE;
  }
}

void
meta_display_ungrab_focus_window_button (MetaDisplay *display,
                                         MetaWindow  *window)
{
  meta_verbose ("Ungrabbing unfocused window buttons for %s\n", window->desc);

  if (!window->have_focus_click_grab)
    return;
  
  {
    int i = 1;
    while (i < MAX_FOCUS_BUTTON)
      {
        meta_change_button_grab (display, window->xwindow,
                                 FALSE, FALSE, i, 0);
        
        ++i;
      }

    window->have_focus_click_grab = FALSE;
  }
}

void
meta_display_increment_event_serial (MetaDisplay *display)
{
  /* We just make some random X request */
  XDeleteProperty (display->xdisplay, display->leader_window,
                   display->atom__MOTIF_WM_HINTS);
}

void
meta_display_update_active_window_hint (MetaDisplay *display)
{
  GSList *tmp;
  
  gulong data[1];

  if (display->focus_window)
    data[0] = display->focus_window->xwindow;
  else
    data[0] = None;
  
  tmp = display->screens;
  while (tmp != NULL)
    {
      MetaScreen *screen = tmp->data;
      
      meta_error_trap_push (display);
      XChangeProperty (display->xdisplay, screen->xroot,
                       display->atom__NET_ACTIVE_WINDOW,
                       XA_WINDOW,
                       32, PropModeReplace, (guchar*) data, 1);

      meta_error_trap_pop (display);

      tmp = tmp->next;
    }
}

void
meta_display_queue_retheme_all_windows (MetaDisplay *display)
{
  GSList* windows;
  GSList *tmp;

  windows = meta_display_list_windows (display, META_LIST_DEFAULT);
  tmp = windows;
  while (tmp != NULL)
    {
      MetaWindow *window = tmp->data;
      
      meta_window_queue (window, META_QUEUE_MOVE_RESIZE);
      if (window->frame)
        {
          meta_frame_queue_draw (window->frame);
        }
      
      tmp = tmp->next;
    }

  g_slist_free (windows);
}

void
meta_display_retheme_all (void)
{
  meta_display_queue_retheme_all_windows (meta_get_display ());
}

void 
meta_display_set_cursor_theme (const char *theme, 
			       int         size)
{
#ifdef HAVE_XCURSOR     
  GSList *tmp;

  MetaDisplay *display = meta_get_display ();

  XcursorSetTheme (display->xdisplay, theme);
  XcursorSetDefaultSize (display->xdisplay, size);

  tmp = display->screens;
  while (tmp != NULL)
    {
      MetaScreen *screen = tmp->data;
	  	  
      meta_screen_update_cursor (screen);

      tmp = tmp->next;
    }

#endif
}

/*
 * Stores whether syncing is currently enabled.
 */
static gboolean is_syncing = FALSE;

/**
 * meta_is_syncing:
 *
 * Returns whether X synchronisation is currently enabled.
 *
 * FIXME: This is *only* called by meta_display_open(), but by that time
 * we have already turned syncing on or off on startup, and we don't
 * have any way to do so while Mutter is running, so it's rather
 * pointless.
 *
 * Returns: %TRUE if we must wait for events whenever we send X requests;
 * %FALSE otherwise.
 */
gboolean
meta_is_syncing (void)
{
  return is_syncing;
}

/**
 * meta_set_syncing:
 * @setting: whether to turn syncing on or off
 *
 * A handy way to turn on synchronisation on or off for every display.
 */
void
meta_set_syncing (gboolean setting)
{
  if (setting != is_syncing)
    {
      is_syncing = setting;
      if (meta_get_display ())
        XSynchronize (meta_get_display ()->xdisplay, is_syncing);
    }
}

/*
 * How long, in milliseconds, we should wait after pinging a window
 * before deciding it's not going to get back to us.
 */
#define PING_TIMEOUT_DELAY 5000

/**
 * meta_display_ping_timeout:
 * @data: All the information about this ping. It is a #MetaPingData
 *        cast to a #gpointer in order to be passable to a timeout function.
 *        This function will also free this parameter.
 *
 * Does whatever it is we decided to do when a window didn't respond
 * to a ping. We also remove the ping from the display's list of
 * pending pings. This function is called by the event loop when the timeout
 * times out which we created at the start of the ping.
 *
 * Returns: Always returns %FALSE, because this function is called as a
 *          timeout and we don't want to run the timer again.
 */
static gboolean
meta_display_ping_timeout (gpointer data)
{
  MetaPingData *ping_data;

  ping_data = data;

  ping_data->ping_timeout_id = 0;

  meta_topic (META_DEBUG_PING,
              "Ping %u on window %lx timed out\n",
              ping_data->timestamp, ping_data->xwindow);
  
  (* ping_data->ping_timeout_func) (ping_data->display, ping_data->xwindow,
                                    ping_data->timestamp, ping_data->user_data);

  ping_data->display->pending_pings =
    g_slist_remove (ping_data->display->pending_pings,
                    ping_data);
  ping_data_free (ping_data);
  
  return FALSE;
}

/**
 * meta_display_ping_window:
 * @display: The #MetaDisplay that the window is on
 * @window: The #MetaWindow to send the ping to
 * @timestamp: The timestamp of the ping. Used for uniqueness.
 *             Cannot be CurrentTime; use a real timestamp!
 * @ping_reply_func: The callback to call if we get a response.
 * @ping_timeout_func: The callback to call if we don't get a response.
 * @user_data: Arbitrary data that will be passed to the callback
 *             function. (In practice it's often a pointer to
 *             the window.)
 *
 * Sends a ping request to a window. The window must respond to
 * the request within a certain amount of time. If it does, we
 * will call one callback; if the time passes and we haven't had
 * a response, we call a different callback. The window must have
 * the hint showing that it can respond to a ping; if it doesn't,
 * we call the "got a response" callback immediately and return.
 * This function returns straight away after setting things up;
 * the callbacks will be called from the event loop.
 *
 * FIXME: This should probably be a method on windows, rather than displays
 *        for one of their windows.
 *
 */
void
meta_display_ping_window (MetaDisplay       *display,
			  MetaWindow        *window,
			  guint32            timestamp,
			  MetaWindowPingFunc ping_reply_func,
			  MetaWindowPingFunc ping_timeout_func,
			  gpointer           user_data)
{
  MetaPingData *ping_data;

  if (timestamp == CurrentTime)
    {
      meta_warning ("Tried to ping a window with CurrentTime! Not allowed.\n");
      return;
    }

  if (!window->net_wm_ping)
    {
      if (ping_reply_func)
        (* ping_reply_func) (display, window->xwindow, timestamp, user_data);

      return;
    }
  
  ping_data = g_new (MetaPingData, 1);
  ping_data->display = display;
  ping_data->xwindow = window->xwindow;
  ping_data->timestamp = timestamp;
  ping_data->ping_reply_func = ping_reply_func;
  ping_data->ping_timeout_func = ping_timeout_func;
  ping_data->user_data = user_data;
  ping_data->ping_timeout_id = g_timeout_add (PING_TIMEOUT_DELAY,
					      meta_display_ping_timeout,
					      ping_data);
  
  display->pending_pings = g_slist_prepend (display->pending_pings, ping_data);

  meta_topic (META_DEBUG_PING,
              "Sending ping with timestamp %u to window %s\n",
              timestamp, window->desc);
  meta_window_send_icccm_message (window,
                                  display->atom__NET_WM_PING,
                                  timestamp);
}

static void
process_request_frame_extents (MetaDisplay    *display,
                               XEvent         *event)
{
  /* The X window whose frame extents will be set. */
  Window xwindow = event->xclient.window;
  unsigned long data[4] = { 0, 0, 0, 0 };

  MotifWmHints *hints = NULL;
  gboolean hints_set = FALSE;

  meta_verbose ("Setting frame extents for 0x%lx\n", xwindow);

  /* See if the window is decorated. */
  hints_set = meta_prop_get_motif_hints (display,
                                         xwindow,
                                         display->atom__MOTIF_WM_HINTS,
                                         &hints);
  if ((hints_set && hints->decorations) || !hints_set)
    {
      MetaFrameBorders borders;
      MetaScreen *screen;

      screen = meta_display_screen_for_xwindow (display,
                                                event->xclient.window);
      if (screen == NULL)
        {
          meta_warning ("Received request to set _NET_FRAME_EXTENTS "
                        "on 0x%lx which is on a screen we are not managing\n",
                        event->xclient.window);
          meta_XFree (hints);
          return;
        }

      /* Return estimated frame extents for a normal window. */
      meta_ui_theme_get_frame_borders (screen->ui,
                                       META_FRAME_TYPE_NORMAL,
                                       0,
                                       &borders);
      data[0] = borders.visible.left;
      data[1] = borders.visible.right;
      data[2] = borders.visible.top;
      data[3] = borders.visible.bottom;
    }

  meta_topic (META_DEBUG_GEOMETRY,
              "Setting _NET_FRAME_EXTENTS on unmanaged window 0x%lx "
              "to top = %lu, left = %lu, bottom = %lu, right = %lu\n",
              xwindow, data[0], data[1], data[2], data[3]);

  meta_error_trap_push (display);
  XChangeProperty (display->xdisplay, xwindow,
                   display->atom__NET_FRAME_EXTENTS,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) data, 4);
  meta_error_trap_pop (display);

  meta_XFree (hints);
}

/**
 * process_pong_message:
 * @display: the display we got the pong from
 * @event: the #XEvent which is a pong; we can tell which
 *         ping it corresponds to because it bears the
 *         same timestamp.
 *
 * Process the pong (the response message) from the ping we sent
 * to the window. This involves removing the timeout, calling the
 * reply handler function, and freeing memory.
 */
static void
process_pong_message (MetaDisplay    *display,
                      XEvent         *event)
{
  GSList *tmp;
  guint32 timestamp = event->xclient.data.l[1];

  meta_topic (META_DEBUG_PING, "Received a pong with timestamp %u\n",
              timestamp);
  
  for (tmp = display->pending_pings; tmp; tmp = tmp->next)
    {
      MetaPingData *ping_data = tmp->data;
			  
      if (timestamp == ping_data->timestamp)
        {
          meta_topic (META_DEBUG_PING,
                      "Matching ping found for pong %u\n", 
                      ping_data->timestamp);

          /* Remove the ping data from the list */
          display->pending_pings = g_slist_remove (display->pending_pings,
                                                   ping_data);

          /* Remove the timeout */
          if (ping_data->ping_timeout_id != 0)
            {
              g_source_remove (ping_data->ping_timeout_id);
              ping_data->ping_timeout_id = 0;
            }
          
          /* Call callback */
          (* ping_data->ping_reply_func) (display, 
                                          ping_data->xwindow,
                                          ping_data->timestamp, 
                                          ping_data->user_data);
			      
          ping_data_free (ping_data);

          break;
        }
    }
}

/**
 * meta_display_window_has_pending_pings:
 * @display: The #MetaDisplay of the window.
 * @window: The #MetaWindow whose pings we want to know about.
 *
 * Finds whether a window has any pings waiting on it.
 *
 * FIXME: This should probably be a method on windows, rather than displays
 *        for one of their windows.
 *
 * Returns: %TRUE if there is at least one ping which has been sent
 *          to the window without getting a response; %FALSE otherwise.
 */
gboolean
meta_display_window_has_pending_pings (MetaDisplay *display,
				       MetaWindow  *window)
{
  GSList *tmp;

  for (tmp = display->pending_pings; tmp; tmp = tmp->next)
    {
      MetaPingData *ping_data = tmp->data;

      if (ping_data->xwindow == window->xwindow) 
        return TRUE;
    }

  return FALSE;
}

MetaGroup*
get_focussed_group (MetaDisplay *display)
{
  if (display->focus_window)
    return display->focus_window->group;
  else
    return NULL;
}

#define IN_TAB_CHAIN(w,t) (((t) == META_TAB_LIST_NORMAL && META_WINDOW_IN_NORMAL_TAB_CHAIN (w)) \
    || ((t) == META_TAB_LIST_DOCKS && META_WINDOW_IN_DOCK_TAB_CHAIN (w)) \
    || ((t) == META_TAB_LIST_GROUP && META_WINDOW_IN_GROUP_TAB_CHAIN (w, get_focussed_group(w->display))) \
    || ((t) == META_TAB_LIST_NORMAL_ALL && META_WINDOW_IN_NORMAL_TAB_CHAIN_TYPE (w)))

static MetaWindow*
find_tab_forward (MetaDisplay   *display,
                  MetaTabList    type,
                  MetaScreen    *screen, 
                  MetaWorkspace *workspace,
                  GList         *start,
                  gboolean       skip_first)
{
  GList *tmp;

  g_return_val_if_fail (start != NULL, NULL);
  g_return_val_if_fail (workspace != NULL, NULL);

  tmp = start;
  if (skip_first)
    tmp = tmp->next;

  while (tmp != NULL)
    {
      MetaWindow *window = tmp->data;

      if (window->screen == screen &&
	  IN_TAB_CHAIN (window, type))
        return window;

      tmp = tmp->next;
    }

  tmp = workspace->mru_list;
  while (tmp != start)
    {
      MetaWindow *window = tmp->data;

      if (IN_TAB_CHAIN (window, type))
        return window;

      tmp = tmp->next;
    }  

  return NULL;
}

static MetaWindow*
find_tab_backward (MetaDisplay   *display,
                   MetaTabList    type,
                   MetaScreen    *screen, 
                   MetaWorkspace *workspace,
                   GList         *start,
                   gboolean       skip_last)
{
  GList *tmp;

  g_return_val_if_fail (start != NULL, NULL);
  g_return_val_if_fail (workspace != NULL, NULL);

  tmp = start;
  if (skip_last)  
    tmp = tmp->prev;
  while (tmp != NULL)
    {
      MetaWindow *window = tmp->data;

      if (window->screen == screen &&
	  IN_TAB_CHAIN (window, type))
        return window;

      tmp = tmp->prev;
    }

  tmp = g_list_last (workspace->mru_list);
  while (tmp != start)
    {
      MetaWindow *window = tmp->data;

      if (IN_TAB_CHAIN (window, type))
        return window;

      tmp = tmp->prev;
    }

  return NULL;
}

static int
mru_cmp (gconstpointer a,
         gconstpointer b)
{
  guint32 time_a, time_b;

  time_a = meta_window_get_user_time ((MetaWindow *)a);
  time_b = meta_window_get_user_time ((MetaWindow *)b);

  if (time_a > time_b)
    return -1;
  else if (time_a < time_b)
    return 1;
  else
    return 0;
}

/**
 * meta_display_get_tab_list:
 * @display: a #MetaDisplay
 * @type: type of tab list
 * @screen: a #MetaScreen
 * @workspace: (allow-none): origin workspace
 *
 * Determine the list of windows that should be displayed for Alt-TAB
 * functionality.  The windows are returned in most recently used order.
 * If @workspace is not %NULL, the list only conains windows that are on
 * @workspace or have the demands-attention hint set; otherwise it contains
 * all windows on @screen.
 *
 * Returns: (transfer container) (element-type Meta.Window): List of windows
 */
GList*
meta_display_get_tab_list (MetaDisplay   *display,
                           MetaTabList    type,
                           MetaScreen    *screen,
                           MetaWorkspace *workspace)
{
  GList *tab_list = NULL;
  GList *global_mru_list = NULL;
  GList *mru_list, *tmp;
  GSList *windows = meta_display_list_windows (display, META_LIST_DEFAULT);
  GSList *w;

  if (workspace == NULL)
    {
      /* Yay for mixing GList and GSList in the API */
      for (w = windows; w; w = w->next)
        global_mru_list = g_list_prepend (global_mru_list, w->data);
      global_mru_list = g_list_sort (global_mru_list, mru_cmp);
    }

  mru_list = workspace ? workspace->mru_list : global_mru_list;

  /* Windows sellout mode - MRU order.
   */
  for (tmp = mru_list; tmp; tmp = tmp->next)
    {
      MetaWindow *window = tmp->data;

      if (window->screen == screen &&
          IN_TAB_CHAIN (window, type))
        tab_list = g_list_prepend (tab_list, window);
    }

  tab_list = g_list_reverse (tab_list);

  /* If filtering by workspace, include windows from
   * other workspaces that demand attention
   */
  if (workspace)
    for (w = windows; w; w = w->next)
      {
        MetaWindow *l_window = w->data;

        if (l_window->wm_state_demands_attention &&
            l_window->workspace != workspace &&
            IN_TAB_CHAIN (l_window, type))
          tab_list = g_list_prepend (tab_list, l_window);
      }

  g_list_free (global_mru_list);
  g_slist_free (windows);
  
  return tab_list;
}

/**
 * meta_display_get_tab_next:
 * @display: a #MetaDisplay
 * @type: type of tab list
 * @screen: a #MetaScreen
 * @workspace: origin workspace
 * @window: (allow-none): starting window 
 * @backward: If %TRUE, look for the previous window.  
 *
 * Determine the next window that should be displayed for Alt-TAB
 * functionality.
 *
 * Returns: (transfer none): Next window
 *
 */
MetaWindow*
meta_display_get_tab_next (MetaDisplay   *display,
                           MetaTabList    type,
                           MetaScreen    *screen,
                           MetaWorkspace *workspace,
                           MetaWindow    *window,
                           gboolean       backward)
{
  gboolean skip;
  GList *tab_list;
  MetaWindow *ret;
  tab_list = meta_display_get_tab_list(display,
                                       type,
                                       screen,
                                       workspace);

  if (tab_list == NULL)
    return NULL;
  
  if (window != NULL)
    {
      g_assert (window->display == display);
      
      if (backward)
        ret = find_tab_backward (display, type, screen, workspace,
                                 g_list_find (tab_list,
                                              window),
                                 TRUE);
      else
        ret = find_tab_forward (display, type, screen, workspace,
                                g_list_find (tab_list,
                                             window),
                                TRUE);
    }
  else
    {
      skip = display->focus_window != NULL && 
             tab_list->data == display->focus_window;
      if (backward)
        ret = find_tab_backward (display, type, screen, workspace,
                                 tab_list, skip);
      else
        ret = find_tab_forward (display, type, screen, workspace,
                                tab_list, skip);
    }

  g_list_free (tab_list);
  return ret;
}

/**
 * meta_display_get_tab_current:
 * @display: a #MetaDisplay
 * @type: type of tab list
 * @screen: a #MetaScreen
 * @workspace: origin workspace
 *
 * Determine the active window that should be displayed for Alt-TAB.
 *
 * Returns: (transfer none): Current window
 *
 */
MetaWindow*
meta_display_get_tab_current (MetaDisplay   *display,
                              MetaTabList    type,
                              MetaScreen    *screen,
                              MetaWorkspace *workspace)
{
  MetaWindow *window;

  window = display->focus_window;
  
  if (window != NULL &&
      window->screen == screen &&
      IN_TAB_CHAIN (window, type) &&
      (workspace == NULL ||
       meta_window_located_on_workspace (window, workspace)))
    return window;
  else
    return NULL;
}

int
meta_resize_gravity_from_grab_op (MetaGrabOp op)
{
  int gravity;
  
  gravity = -1;
  switch (op)
    {
    case META_GRAB_OP_RESIZING_SE:
    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
      gravity = NorthWestGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_S:
    case META_GRAB_OP_RESIZING_S:
      gravity = NorthGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
    case META_GRAB_OP_RESIZING_SW:
      gravity = NorthEastGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_N:
    case META_GRAB_OP_RESIZING_N:
      gravity = SouthGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
    case META_GRAB_OP_RESIZING_NE:
      gravity = SouthWestGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
    case META_GRAB_OP_RESIZING_NW:
      gravity = SouthEastGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_E:
    case META_GRAB_OP_RESIZING_E:
      gravity = WestGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_W:
    case META_GRAB_OP_RESIZING_W:
      gravity = EastGravity;
      break;
    case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
      gravity = CenterGravity;
      break;
    default:
      break;
    }

  return gravity;
}

static MetaScreen*
find_screen_for_selection (MetaDisplay *display,
                           Window       owner,
                           Atom         selection)
{  
  GSList *tmp;  
  
  tmp = display->screens;
  while (tmp != NULL)
    {
      MetaScreen *screen = tmp->data;
      
      if (screen->wm_sn_selection_window == owner &&
          screen->wm_sn_atom == selection)
        return screen;
  
      tmp = tmp->next;
    }

  return NULL;
}

/* from fvwm2, Copyright Matthias Clasen, Dominik Vogt */
static gboolean
convert_property (MetaDisplay *display,
                  MetaScreen  *screen,
                  Window       w,
                  Atom         target,
                  Atom         property)
{
#define N_TARGETS 4
  Atom conversion_targets[N_TARGETS];
  long icccm_version[] = { 2, 0 };

  conversion_targets[0] = display->atom_TARGETS;
  conversion_targets[1] = display->atom_MULTIPLE;
  conversion_targets[2] = display->atom_TIMESTAMP;
  conversion_targets[3] = display->atom_VERSION;

  meta_error_trap_push_with_return (display);
  if (target == display->atom_TARGETS)
    XChangeProperty (display->xdisplay, w, property,
		     XA_ATOM, 32, PropModeReplace,
		     (unsigned char *)conversion_targets, N_TARGETS);
  else if (target == display->atom_TIMESTAMP)
    XChangeProperty (display->xdisplay, w, property,
		     XA_INTEGER, 32, PropModeReplace,
		     (unsigned char *)&screen->wm_sn_timestamp, 1);
  else if (target == display->atom_VERSION)
    XChangeProperty (display->xdisplay, w, property,
		     XA_INTEGER, 32, PropModeReplace,
		     (unsigned char *)icccm_version, 2);
  else
    {
      meta_error_trap_pop_with_return (display);
      return FALSE;
    }
  
  if (meta_error_trap_pop_with_return (display) != Success)
    return FALSE;

  /* Be sure the PropertyNotify has arrived so we
   * can send SelectionNotify
   */
  /* FIXME the error trap pop synced anyway, right? */
  meta_topic (META_DEBUG_SYNC, "Syncing on %s\n", G_STRFUNC);
  XSync (display->xdisplay, False);

  return TRUE;
}

/* from fvwm2, Copyright Matthias Clasen, Dominik Vogt */
static void
process_selection_request (MetaDisplay   *display,
                           XEvent        *event)
{
  XSelectionEvent reply;
  MetaScreen *screen;

  screen = find_screen_for_selection (display,
                                      event->xselectionrequest.owner,
                                      event->xselectionrequest.selection);

  if (screen == NULL)
    {
      char *str;
      
      meta_error_trap_push (display);
      str = XGetAtomName (display->xdisplay,
                          event->xselectionrequest.selection);
      meta_error_trap_pop (display);
      
      meta_verbose ("Selection request with selection %s window 0x%lx not a WM_Sn selection we recognize\n",
                    str ? str : "(bad atom)", event->xselectionrequest.owner);
      
      meta_XFree (str);

      return;
    }
  
  reply.type = SelectionNotify;
  reply.display = display->xdisplay;
  reply.requestor = event->xselectionrequest.requestor;
  reply.selection = event->xselectionrequest.selection;
  reply.target = event->xselectionrequest.target;
  reply.property = None;
  reply.time = event->xselectionrequest.time;

  if (event->xselectionrequest.target == display->atom_MULTIPLE)
    {
      if (event->xselectionrequest.property != None)
        {
          Atom type, *adata;
          int i, format;
          unsigned long num, rest;
          unsigned char *data;

          meta_error_trap_push_with_return (display);
          if (XGetWindowProperty (display->xdisplay,
                                  event->xselectionrequest.requestor,
                                  event->xselectionrequest.property, 0, 256, False,
                                  display->atom_ATOM_PAIR,
                                  &type, &format, &num, &rest, &data) != Success)
            {
              meta_error_trap_pop_with_return (display);
              return;
            }
          
          if (meta_error_trap_pop_with_return (display) == Success)
            {              
              /* FIXME: to be 100% correct, should deal with rest > 0,
               * but since we have 4 possible targets, we will hardly ever
               * meet multiple requests with a length > 8
               */
              adata = (Atom*)data;
              i = 0;
              while (i < (int) num)
                {
                  if (!convert_property (display, screen,
                                         event->xselectionrequest.requestor,
                                         adata[i], adata[i+1]))
                    adata[i+1] = None;
                  i += 2;
                }

              meta_error_trap_push (display);
              XChangeProperty (display->xdisplay,
                               event->xselectionrequest.requestor,
                               event->xselectionrequest.property,
                               display->atom_ATOM_PAIR,
                               32, PropModeReplace, data, num);
              meta_error_trap_pop (display);
              meta_XFree (data);
            }
        }
    }
  else
    {
      if (event->xselectionrequest.property == None)
        event->xselectionrequest.property = event->xselectionrequest.target;
      
      if (convert_property (display, screen,
                            event->xselectionrequest.requestor,
                            event->xselectionrequest.target,
                            event->xselectionrequest.property))
        reply.property = event->xselectionrequest.property;
    }

  XSendEvent (display->xdisplay,
              event->xselectionrequest.requestor,
              False, 0L, (XEvent*)&reply);

  meta_verbose ("Handled selection request\n");
}

static void
process_selection_clear (MetaDisplay   *display,
                         XEvent        *event)
{
  /* We need to unmanage the screen on which we lost the selection */
  MetaScreen *screen;

  screen = find_screen_for_selection (display,
                                      event->xselectionclear.window,
                                      event->xselectionclear.selection);
  

  if (screen != NULL)
    {
      meta_verbose ("Got selection clear for screen %d on display %s\n",
                    screen->number, display->name);
      
      meta_display_unmanage_screen (display, 
                                    screen,
                                    event->xselectionclear.time);

      /* display and screen may both be invalid memory... */
      
      return;
    }

  {
    char *str;
            
    meta_error_trap_push (display);
    str = XGetAtomName (display->xdisplay,
                        event->xselectionclear.selection);
    meta_error_trap_pop (display);

    meta_verbose ("Selection clear with selection %s window 0x%lx not a WM_Sn selection we recognize\n",
                  str ? str : "(bad atom)", event->xselectionclear.window);

    meta_XFree (str);
  }
}

void
meta_display_unmanage_screen (MetaDisplay *display,
                              MetaScreen  *screen,
                              guint32      timestamp)
{
  meta_verbose ("Unmanaging screen %d on display %s\n",
                screen->number, display->name);
  
  g_return_if_fail (g_slist_find (display->screens, screen) != NULL);
  
  meta_screen_free (screen, timestamp);
  display->screens = g_slist_remove (display->screens, screen);

  if (display->screens == NULL)
    meta_display_close (display, timestamp);
}

void
meta_display_unmanage_windows_for_screen (MetaDisplay *display,
                                          MetaScreen  *screen,
                                          guint32      timestamp)
{
  GSList *tmp;
  GSList *winlist;

  winlist = meta_display_list_windows (display,
                                       META_LIST_INCLUDE_OVERRIDE_REDIRECT);
  winlist = g_slist_sort (winlist, meta_display_stack_cmp);
  g_slist_foreach (winlist, (GFunc)g_object_ref, NULL);

  /* Unmanage all windows */
  tmp = winlist;
  while (tmp != NULL)
    {
      MetaWindow *window = tmp->data;

      /* Check if already unmanaged for safety - in particular, catch
       * the case where unmanaging a parent window can cause attached
       * dialogs to be (temporarily) unmanaged.
       */
      if (!window->unmanaging)
        meta_window_unmanage (window, timestamp);
      g_object_unref (window);
      
      tmp = tmp->next;
    }
  g_slist_free (winlist);
}

int
meta_display_stack_cmp (const void *a,
                        const void *b)
{
  MetaWindow *aw = (void*) a;
  MetaWindow *bw = (void*) b;

  if (aw->screen == bw->screen)
    return meta_stack_windows_cmp (aw->screen->stack, aw, bw);
  /* Then assume screens are stacked by number */
  else if (aw->screen->number < bw->screen->number)
    return -1;
  else if (aw->screen->number > bw->screen->number)
    return 1;
  else
    return 0; /* not reached in theory, if windows on same display */
}

/**
 * meta_display_sort_windows_by_stacking:
 * @display: a #MetaDisplay
 * @windows: (element-type MetaWindow): Set of windows
 *
 * Sorts a set of windows according to their current stacking order. If windows
 * from multiple screens are present in the set of input windows, then all the
 * windows on screen 0 are sorted below all the windows on screen 1, and so forth.
 * Since the stacking order of override-redirect windows isn't controlled by
 * Metacity, if override-redirect windows are in the input, the result may not
 * correspond to the actual stacking order in the X server.
 *
 * An example of using this would be to sort the list of transient dialogs for a
 * window into their current stacking order.
 *
 * Returns: (transfer container) (element-type MetaWindow): Input windows sorted by stacking order, from lowest to highest
 */
GSList *
meta_display_sort_windows_by_stacking (MetaDisplay *display,
                                       GSList      *windows)
{
  GSList *copy = g_slist_copy (windows);

  copy = g_slist_sort (copy, meta_display_stack_cmp);

  return copy;
}

void
meta_display_devirtualize_modifiers (MetaDisplay        *display,
                                     MetaVirtualModifier modifiers,
                                     unsigned int       *mask)
{
  *mask = 0;
  
  if (modifiers & META_VIRTUAL_SHIFT_MASK)
    *mask |= ShiftMask;
  if (modifiers & META_VIRTUAL_CONTROL_MASK)
    *mask |= ControlMask;
  if (modifiers & META_VIRTUAL_ALT_MASK)
    *mask |= Mod1Mask;
  if (modifiers & META_VIRTUAL_META_MASK)
    *mask |= display->meta_mask;
  if (modifiers & META_VIRTUAL_HYPER_MASK)
    *mask |= display->hyper_mask;
  if (modifiers & META_VIRTUAL_SUPER_MASK)
    *mask |= display->super_mask;
  if (modifiers & META_VIRTUAL_MOD2_MASK)
    *mask |= Mod2Mask;
  if (modifiers & META_VIRTUAL_MOD3_MASK)
    *mask |= Mod3Mask;
  if (modifiers & META_VIRTUAL_MOD4_MASK)
    *mask |= Mod4Mask;
  if (modifiers & META_VIRTUAL_MOD5_MASK)
    *mask |= Mod5Mask;  
}

static void
update_window_grab_modifiers (MetaDisplay *display)
     
{
  MetaVirtualModifier virtual_mods;
  unsigned int mods;
    
  virtual_mods = meta_prefs_get_mouse_button_mods ();
  meta_display_devirtualize_modifiers (display, virtual_mods,
                                       &mods);
    
  display->window_grab_modifiers = mods;
}

static void
prefs_changed_callback (MetaPreference pref,
                        void          *data)
{
  MetaDisplay *display = data;
  
  /* It may not be obvious why we regrab on focus mode
   * change; it's because we handle focus clicks a
   * bit differently for the different focus modes.
   */
  if (pref == META_PREF_MOUSE_BUTTON_MODS ||
      pref == META_PREF_FOCUS_MODE)
    {
      MetaDisplay *display = data;
      GSList *windows;
      GSList *tmp;
      
      windows = meta_display_list_windows (display, META_LIST_DEFAULT);
      
      /* Ungrab all */
      tmp = windows;
      while (tmp != NULL)
        {
          MetaWindow *w = tmp->data;
          meta_display_ungrab_window_buttons (display, w->xwindow);
          meta_display_ungrab_focus_window_button (display, w);
          tmp = tmp->next;
        }

      /* change our modifier */
      if (pref == META_PREF_MOUSE_BUTTON_MODS)
        update_window_grab_modifiers (display);

      /* Grab all */
      tmp = windows;
      while (tmp != NULL)
        {
          MetaWindow *w = tmp->data;
          if (w->type != META_WINDOW_DOCK)
            {
              meta_display_grab_focus_window_button (display, w);
              meta_display_grab_window_buttons (display, w->xwindow);
            }
          tmp = tmp->next;
        }

      g_slist_free (windows);
    }
  else if (pref == META_PREF_AUDIBLE_BELL)
    {
      meta_bell_set_audible (display, meta_prefs_bell_is_audible ());
    }
}

void
meta_display_increment_focus_sentinel (MetaDisplay *display)
{
  unsigned long data[1];

  data[0] = meta_display_get_current_time (display);
  
  XChangeProperty (display->xdisplay,
                   ((MetaScreen*) display->screens->data)->xroot,
                   display->atom__MUTTER_SENTINEL,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) data, 1);
  
  display->sentinel_counter += 1;
}

void
meta_display_decrement_focus_sentinel (MetaDisplay *display)
{
  display->sentinel_counter -= 1;

  if (display->sentinel_counter < 0)
    display->sentinel_counter = 0;
}

gboolean
meta_display_focus_sentinel_clear (MetaDisplay *display)
{
  return (display->sentinel_counter == 0);
}

static void
sanity_check_timestamps (MetaDisplay *display,
                         guint32      timestamp)
{
  if (XSERVER_TIME_IS_BEFORE (timestamp, display->last_focus_time))
    {
      meta_warning ("last_focus_time (%u) is greater than comparison "
                    "timestamp (%u).  This most likely represents a buggy "
                    "client sending inaccurate timestamps in messages such as "
                    "_NET_ACTIVE_WINDOW.  Trying to work around...\n",
                    display->last_focus_time, timestamp);
      display->last_focus_time = timestamp;
    }
  if (XSERVER_TIME_IS_BEFORE (timestamp, display->last_user_time))
    {
      GSList *windows;
      GSList *tmp;

      meta_warning ("last_user_time (%u) is greater than comparison "
                    "timestamp (%u).  This most likely represents a buggy "
                    "client sending inaccurate timestamps in messages such as "
                    "_NET_ACTIVE_WINDOW.  Trying to work around...\n",
                    display->last_user_time, timestamp);
      display->last_user_time = timestamp;

      windows = meta_display_list_windows (display, META_LIST_DEFAULT);
      tmp = windows;
      while (tmp != NULL)
        {
          MetaWindow *window = tmp->data;
          
          if (XSERVER_TIME_IS_BEFORE (timestamp, window->net_wm_user_time))
            {
              meta_warning ("%s appears to be one of the offending windows "
                            "with a timestamp of %u.  Working around...\n",
                            window->desc, window->net_wm_user_time);
              meta_window_set_user_time (window, timestamp);
            }

          tmp = tmp->next;
        }

      g_slist_free (windows);
    }
}

void
meta_display_set_input_focus_window (MetaDisplay *display, 
                                     MetaWindow  *window,
                                     gboolean     focus_frame,
                                     guint32      timestamp)
{
  request_xserver_input_focus_change (display,
                                      window->screen,
                                      window->client_type == META_WINDOW_CLIENT_TYPE_WAYLAND ?
                                      META_FOCUS_WAYLAND_CLIENT : META_FOCUS_X_CLIENT,
                                      window,
                                      focus_frame ? window->frame->xwindow : window->xwindow,
                                      timestamp);
}

void
meta_display_request_take_focus (MetaDisplay *display,
                                 MetaWindow  *window,
                                 guint32      timestamp)
{
  if (timestamp_too_old (display, &timestamp))
    return;

  meta_topic (META_DEBUG_FOCUS, "WM_TAKE_FOCUS(%s, %u)\n",
              window->desc, timestamp);

  if (window != display->focus_window)
    {
      /* The "Globally Active Input" window case, where the window
       * doesn't want us to call XSetInputFocus on it, but does
       * want us to send a WM_TAKE_FOCUS.
       *
       * We can't just set display->focus_window to @window, since we
       * we don't know when (or even if) the window will actually take
       * focus, so we could end up being wrong for arbitrarily long.
       * But we also can't leave it set to the current window, or else
       * bug #597352 would come back. So we focus the no_focus_window
       * now (and set display->focus_window to that), send the
       * WM_TAKE_FOCUS, and then just forget about @window
       * until/unless we get a FocusIn.
       */
      meta_display_focus_the_no_focus_window (display,
                                              window->screen,
                                              timestamp);
    }
  meta_window_send_icccm_message (window,
                                  display->atom_WM_TAKE_FOCUS,
                                  timestamp);
}

void
meta_display_set_input_focus_xwindow (MetaDisplay   *display,
                                      MetaScreen    *screen,
                                      MetaFocusType  type,
                                      Window         window,
                                      guint32        timestamp)
{
  request_xserver_input_focus_change (display,
                                      screen,
                                      type,
                                      NULL,
                                      window,
                                      timestamp);
}

void
meta_display_focus_the_no_focus_window (MetaDisplay *display,
                                        MetaScreen  *screen,
                                        guint32      timestamp)
{
  request_xserver_input_focus_change (display,
                                      screen,
                                      META_FOCUS_NO_FOCUS_WINDOW,
                                      NULL,
                                      screen->no_focus_window,
                                      timestamp);
}

void
meta_display_remove_autoraise_callback (MetaDisplay *display)
{
  if (display->autoraise_timeout_id != 0)
    {
      g_source_remove (display->autoraise_timeout_id);
      display->autoraise_timeout_id = 0;
      display->autoraise_window = NULL;
    }
}

void
meta_display_overlay_key_activate (MetaDisplay *display)
{
  g_signal_emit (display, display_signals[OVERLAY_KEY], 0);
}

void
meta_display_accelerator_activate (MetaDisplay *display,
                                   guint        action,
                                   guint        deviceid,
                                   guint        timestamp)
{
  g_signal_emit (display, display_signals[ACCELERATOR_ACTIVATED],
                 0, action, deviceid, timestamp);
}

gboolean
meta_display_modifiers_accelerator_activate (MetaDisplay *display)
{
  gboolean freeze;

  g_signal_emit (display, display_signals[MODIFIERS_ACCELERATOR_ACTIVATED], 0, &freeze);

  return freeze;
}

void
meta_display_get_compositor_version (MetaDisplay *display,
                                     int         *major,
                                     int         *minor)
{
  *major = display->composite_major_version;
  *minor = display->composite_minor_version;
}

/**
 * meta_display_get_xinput_opcode: (skip)
 * @display: a #MetaDisplay
 *
 */
int
meta_display_get_xinput_opcode (MetaDisplay *display)
{
  return display->xinput_opcode;
}

/**
 * meta_display_supports_extended_barriers:
 * @display: a #MetaDisplay
 *
 * Returns: whether the X server supports extended barrier
 * features as defined in version 2.3 of the XInput 2
 * specification.
 *
 * Clients should use this method to determine whether their
 * interfaces should depend on new barrier features.
 */
gboolean
meta_display_supports_extended_barriers (MetaDisplay *display)
{
  return META_DISPLAY_HAS_XINPUT_23 (display);
}

/**
 * meta_display_get_xdisplay: (skip)
 * @display: a #MetaDisplay
 *
 */
Display *
meta_display_get_xdisplay (MetaDisplay *display)
{
  return display->xdisplay;
}

/**
 * meta_display_get_compositor: (skip)
 * @display: a #MetaDisplay
 *
 */
MetaCompositor *
meta_display_get_compositor (MetaDisplay *display)
{
  return display->compositor;
}

/**
 * meta_display_get_screens:
 * @display: a #MetaDisplay
 *
 * Returns: (transfer none) (element-type Meta.Screen): Screens for this display
 */
GSList *
meta_display_get_screens (MetaDisplay *display)
{
  return display->screens;
}

gboolean
meta_display_has_shape (MetaDisplay *display)
{
  return META_DISPLAY_HAS_SHAPE (display);
}

/**
 * meta_display_get_focus_window:
 * @display: a #MetaDisplay
 *
 * Get our best guess as to the "currently" focused window (that is,
 * the window that we expect will be focused at the point when the X
 * server processes our next request).
 *
 * Return Value: (transfer none): The current focus window
 */
MetaWindow *
meta_display_get_focus_window (MetaDisplay *display)
{
  return display->focus_window;
}

int 
meta_display_get_damage_event_base (MetaDisplay *display)
{
  return display->damage_event_base;
}

#ifdef HAVE_SHAPE
int
meta_display_get_shape_event_base (MetaDisplay *display)
{
  return display->shape_event_base;
}
#endif

/**
 * meta_display_get_leader_window:
 * @display: a #MetaDisplay
 *
 * Returns the window manager's leader window (as defined by the
 * _NET_SUPPORTING_WM_CHECK mechanism of EWMH). For use by plugins that wish
 * to attach additional custom properties to this window.
 *
 * Return value: (transfer none): xid of the leader window.
 **/
Window
meta_display_get_leader_window (MetaDisplay *display)
{
  return display->leader_window;
}

/**
 * meta_display_clear_mouse_mode:
 * @display: a #MetaDisplay
 *
 * Sets the mouse-mode flag to %FALSE, which means that motion events are
 * no longer ignored in mouse or sloppy focus.
 * This is an internal function. It should be used only for reimplementing
 * keybindings, and only in a manner compatible with core code.
 */
void
meta_display_clear_mouse_mode (MetaDisplay *display)
{
  display->mouse_mode = FALSE;
}