openbox/screen.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    screen.c for the Openbox window manager
   4    Copyright (c) 2006        Mikael Magnusson
   5    Copyright (c) 2003-2007   Dana Jansens
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "debug.h"
  21 #include "openbox.h"
  22 #include "dock.h"
  23 #include "grab.h"
  24 #include "startupnotify.h"
  25 #include "moveresize.h"
  26 #include "config.h"
  27 #include "screen.h"
  28 #include "client.h"
  29 #include "session.h"
  30 #include "frame.h"
  31 #include "event.h"
  32 #include "focus.h"
  33 #include "focus_cycle.h"
  34 #include "popup.h"
  35 #include "version.h"
  36 #include "obrender/render.h"
  37 #include "gettext.h"
  38 #include "obt/display.h"
  39 #include "obt/xqueue.h"
  40 #include "obt/prop.h"
  41
  42 #include <X11/Xlib.h>
  43 #ifdef HAVE_UNISTD_H
  44 #  include <sys/types.h>
  45 #  include <unistd.h>
  46 #endif
  47 #include <assert.h>
  48
  49 /*! The event mask to grab on the root window */
  50 #define ROOT_EVENTMASK (StructureNotifyMask | PropertyChangeMask | \
  51                         EnterWindowMask | LeaveWindowMask | \
  52                         SubstructureRedirectMask | FocusChangeMask | \
  53                         ButtonPressMask | ButtonReleaseMask)
  54
  55 static gboolean screen_validate_layout(ObDesktopLayout *l);
  56 static gboolean replace_wm(void);
  57 static void     screen_tell_ksplash(void);
  58 static void     screen_fallback_focus(void);
  59
  60 guint           screen_num_desktops;
  61 guint           screen_num_monitors;
  62 guint           screen_desktop;
  63 guint           screen_last_desktop;
  64 gboolean        screen_showing_desktop;
  65 ObDesktopLayout screen_desktop_layout;
  66 gchar         **screen_desktop_names;
  67 Window          screen_support_win;
  68 Time            screen_desktop_user_time = CurrentTime;
  69
  70 static Size     screen_physical_size;
  71 static guint    screen_old_desktop;
  72 static gboolean screen_desktop_timeout = TRUE;
  73 static guint    screen_desktop_timer = 0;
  74 /*! An array of desktops, holding an array of areas per monitor */
  75 static Rect  *monitor_area = NULL;
  76 /*! An array of desktops, holding an array of struts */
  77 static GSList *struts_top = NULL;
  78 static GSList *struts_left = NULL;
  79 static GSList *struts_right = NULL;
  80 static GSList *struts_bottom = NULL;
  81
  82 static ObPagerPopup *desktop_popup;
  83 static guint         desktop_popup_timer = 0;
  84 static gboolean      desktop_popup_perm;
  85
  86 /*! The number of microseconds that you need to be on a desktop before it will
  87   replace the remembered "last desktop" */
  88 #define REMEMBER_LAST_DESKTOP_TIME 750
  89
  90 static gboolean replace_wm(void)
  91 {
  92     gchar *wm_sn;
  93     Atom wm_sn_atom;
  94     Window current_wm_sn_owner;
  95     Time timestamp;
  96
  97     wm_sn = g_strdup_printf("WM_S%d", ob_screen);
  98     wm_sn_atom = XInternAtom(obt_display, wm_sn, FALSE);
  99     g_free(wm_sn);
 100
 101     current_wm_sn_owner = XGetSelectionOwner(obt_display, wm_sn_atom);
 102     if (current_wm_sn_owner == screen_support_win)
 103         current_wm_sn_owner = None;
 104     if (current_wm_sn_owner) {
 105         if (!ob_replace_wm) {
 106             g_message(_("A window manager is already running on screen %d"),
 107                       ob_screen);
 108             return FALSE;
 109         }
 110         obt_display_ignore_errors(TRUE);
 111
 112         /* We want to find out when the current selection owner dies */
 113         XSelectInput(obt_display, current_wm_sn_owner, StructureNotifyMask);
 114         XSync(obt_display, FALSE);
 115
 116         obt_display_ignore_errors(FALSE);
 117         if (obt_display_error_occured)
 118             current_wm_sn_owner = None;
 119     }
 120
 121     timestamp = event_time();
 122
 123     XSetSelectionOwner(obt_display, wm_sn_atom, screen_support_win,
 124                        timestamp);
 125
 126     if (XGetSelectionOwner(obt_display, wm_sn_atom) != screen_support_win) {
 127         g_message(_("Could not acquire window manager selection on screen %d"),
 128                   ob_screen);
 129         return FALSE;
 130     }
 131
 132     /* Wait for old window manager to go away */
 133     if (current_wm_sn_owner) {
 134       gulong wait = 0;
 135       const gulong timeout = G_USEC_PER_SEC * 15; /* wait for 15s max */
 136       ObtXQueueWindowType wt;
 137
 138       wt.window = current_wm_sn_owner;
 139       wt.type = DestroyNotify;
 140
 141       while (wait < timeout) {
 142           /* Checks the local queue and incoming events for this event */
 143           if (xqueue_exists_local(xqueue_match_window_type, &wt))
 144               break;
 145           g_usleep(G_USEC_PER_SEC / 10);
 146           wait += G_USEC_PER_SEC / 10;
 147       }
 148
 149       if (wait >= timeout) {
 150           g_message(_("The WM on screen %d is not exiting"), ob_screen);
 151           return FALSE;
 152       }
 153     }
 154
 155     /* Send client message indicating that we are now the WM */
 156     obt_prop_message(ob_screen, obt_root(ob_screen), OBT_PROP_ATOM(MANAGER),
 157                      timestamp, wm_sn_atom, screen_support_win, 0, 0,
 158                      SubstructureNotifyMask);
 159
 160     return TRUE;
 161 }
 162
 163 gboolean screen_annex(void)
 164 {
 165     XSetWindowAttributes attrib;
 166     pid_t pid;
 167     gint i, num_support;
 168     gulong *supported;
 169
 170     /* create the netwm support window */
 171     attrib.override_redirect = TRUE;
 172     attrib.event_mask = PropertyChangeMask;
 173     screen_support_win = XCreateWindow(obt_display, obt_root(ob_screen),
 174                                        -100, -100, 1, 1, 0,
 175                                        CopyFromParent, InputOutput,
 176                                        CopyFromParent,
 177                                        CWEventMask | CWOverrideRedirect,
 178                                        &attrib);
 179     XMapWindow(obt_display, screen_support_win);
 180     XLowerWindow(obt_display, screen_support_win);
 181
 182     if (!replace_wm()) {
 183         XDestroyWindow(obt_display, screen_support_win);
 184         return FALSE;
 185     }
 186
 187     obt_display_ignore_errors(TRUE);
 188     XSelectInput(obt_display, obt_root(ob_screen), ROOT_EVENTMASK);
 189     obt_display_ignore_errors(FALSE);
 190     if (obt_display_error_occured) {
 191         g_message(_("A window manager is already running on screen %d"),
 192                   ob_screen);
 193
 194         XDestroyWindow(obt_display, screen_support_win);
 195         return FALSE;
 196     }
 197
 198     screen_set_root_cursor();
 199
 200     /* set the OPENBOX_PID hint */
 201     pid = getpid();
 202     OBT_PROP_SET32(obt_root(ob_screen), OPENBOX_PID, CARDINAL, pid);
 203
 204     /* set supporting window */
 205     OBT_PROP_SET32(obt_root(ob_screen),
 206                    NET_SUPPORTING_WM_CHECK, WINDOW, screen_support_win);
 207
 208     /* set properties on the supporting window */
 209     OBT_PROP_SETS(screen_support_win, NET_WM_NAME, "Openbox");
 210     OBT_PROP_SET32(screen_support_win, NET_SUPPORTING_WM_CHECK,
 211                    WINDOW, screen_support_win);
 212
 213     /* set the _NET_SUPPORTED_ATOMS hint */
 214
 215     /* this is all the atoms after NET_SUPPORTED in the ObtPropAtoms enum */
 216     num_support = OBT_PROP_NUM_ATOMS - OBT_PROP_NET_SUPPORTED - 1;
 217     i = 0;
 218     supported = g_new(gulong, num_support);
 219     supported[i++] = OBT_PROP_ATOM(NET_SUPPORTING_WM_CHECK);
 220     supported[i++] = OBT_PROP_ATOM(NET_WM_FULL_PLACEMENT);
 221     supported[i++] = OBT_PROP_ATOM(NET_CURRENT_DESKTOP);
 222     supported[i++] = OBT_PROP_ATOM(NET_NUMBER_OF_DESKTOPS);
 223     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_GEOMETRY);
 224     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_VIEWPORT);
 225     supported[i++] = OBT_PROP_ATOM(NET_ACTIVE_WINDOW);
 226     supported[i++] = OBT_PROP_ATOM(NET_WORKAREA);
 227     supported[i++] = OBT_PROP_ATOM(NET_CLIENT_LIST);
 228     supported[i++] = OBT_PROP_ATOM(NET_CLIENT_LIST_STACKING);
 229     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_NAMES);
 230     supported[i++] = OBT_PROP_ATOM(NET_CLOSE_WINDOW);
 231     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_LAYOUT);
 232     supported[i++] = OBT_PROP_ATOM(NET_SHOWING_DESKTOP);
 233     supported[i++] = OBT_PROP_ATOM(NET_WM_NAME);
 234     supported[i++] = OBT_PROP_ATOM(NET_WM_VISIBLE_NAME);
 235     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON_NAME);
 236     supported[i++] = OBT_PROP_ATOM(NET_WM_VISIBLE_ICON_NAME);
 237     supported[i++] = OBT_PROP_ATOM(NET_WM_DESKTOP);
 238     supported[i++] = OBT_PROP_ATOM(NET_WM_STRUT);
 239     supported[i++] = OBT_PROP_ATOM(NET_WM_STRUT_PARTIAL);
 240     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON);
 241     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON_GEOMETRY);
 242     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE);
 243     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DESKTOP);
 244     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DOCK);
 245     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_TOOLBAR);
 246     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_MENU);
 247     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_UTILITY);
 248     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_SPLASH);
 249     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DIALOG);
 250     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_NORMAL);
 251     supported[i++] = OBT_PROP_ATOM(NET_WM_ALLOWED_ACTIONS);
 252     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_OPACITY);
 253     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MOVE);
 254     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_RESIZE);
 255     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MINIMIZE);
 256     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_SHADE);
 257     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MAXIMIZE_HORZ);
 258     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MAXIMIZE_VERT);
 259     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_FULLSCREEN);
 260     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_CHANGE_DESKTOP);
 261     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_CLOSE);
 262     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_ABOVE);
 263     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_BELOW);
 264     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE);
 265     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MODAL);
 266     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MAXIMIZED_VERT);
 267     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MAXIMIZED_HORZ);
 268     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SHADED);
 269     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SKIP_TASKBAR);
 270     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SKIP_PAGER);
 271     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_HIDDEN);
 272     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_FULLSCREEN);
 273     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_ABOVE);
 274     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_BELOW);
 275     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_DEMANDS_ATTENTION);
 276     supported[i++] = OBT_PROP_ATOM(NET_MOVERESIZE_WINDOW);
 277     supported[i++] = OBT_PROP_ATOM(NET_WM_MOVERESIZE);
 278     supported[i++] = OBT_PROP_ATOM(NET_WM_USER_TIME);
 279 /*
 280     supported[i++] = OBT_PROP_ATOM(NET_WM_USER_TIME_WINDOW);
 281 */
 282     supported[i++] = OBT_PROP_ATOM(NET_FRAME_EXTENTS);
 283     supported[i++] = OBT_PROP_ATOM(NET_REQUEST_FRAME_EXTENTS);
 284     supported[i++] = OBT_PROP_ATOM(NET_RESTACK_WINDOW);
 285     supported[i++] = OBT_PROP_ATOM(NET_STARTUP_ID);
 286 #ifdef SYNC
 287     supported[i++] = OBT_PROP_ATOM(NET_WM_SYNC_REQUEST);
 288     supported[i++] = OBT_PROP_ATOM(NET_WM_SYNC_REQUEST_COUNTER);
 289 #endif
 290     supported[i++] = OBT_PROP_ATOM(NET_WM_PID);
 291     supported[i++] = OBT_PROP_ATOM(NET_WM_PING);
 292
 293     supported[i++] = OBT_PROP_ATOM(KDE_WM_CHANGE_STATE);
 294     supported[i++] = OBT_PROP_ATOM(KDE_NET_WM_FRAME_STRUT);
 295     supported[i++] = OBT_PROP_ATOM(KDE_NET_WM_WINDOW_TYPE_OVERRIDE);
 296
 297     supported[i++] = OBT_PROP_ATOM(OB_WM_ACTION_UNDECORATE);
 298     supported[i++] = OBT_PROP_ATOM(OB_WM_STATE_UNDECORATED);
 299     supported[i++] = OBT_PROP_ATOM(OPENBOX_PID);
 300     supported[i++] = OBT_PROP_ATOM(OB_THEME);
 301     supported[i++] = OBT_PROP_ATOM(OB_CONFIG_FILE);
 302     supported[i++] = OBT_PROP_ATOM(OB_CONTROL);
 303     supported[i++] = OBT_PROP_ATOM(OB_VERSION);
 304     supported[i++] = OBT_PROP_ATOM(OB_APP_ROLE);
 305     supported[i++] = OBT_PROP_ATOM(OB_APP_TITLE);
 306     supported[i++] = OBT_PROP_ATOM(OB_APP_NAME);
 307     supported[i++] = OBT_PROP_ATOM(OB_APP_CLASS);
 308     supported[i++] = OBT_PROP_ATOM(OB_APP_GROUP_NAME);
 309     supported[i++] = OBT_PROP_ATOM(OB_APP_GROUP_CLASS);
 310     supported[i++] = OBT_PROP_ATOM(OB_APP_TYPE);
 311     g_assert(i == num_support);
 312
 313     OBT_PROP_SETA32(obt_root(ob_screen),
 314                     NET_SUPPORTED, ATOM, supported, num_support);
 315     g_free(supported);
 316
 317     OBT_PROP_SETS(RootWindow(obt_display, ob_screen), OB_VERSION,
 318                   OPENBOX_VERSION);
 319
 320     screen_tell_ksplash();
 321
 322     return TRUE;
 323 }
 324
 325 static void screen_tell_ksplash(void)
 326 {
 327     XEvent e;
 328     char **argv;
 329
 330     argv = g_new(gchar*, 6);
 331     argv[0] = g_strdup("dcop");
 332     argv[1] = g_strdup("ksplash");
 333     argv[2] = g_strdup("ksplash");
 334     argv[3] = g_strdup("upAndRunning(QString)");
 335     argv[4] = g_strdup("wm started");
 336     argv[5] = NULL;
 337
 338     /* tell ksplash through the dcop server command line interface */
 339     g_spawn_async(NULL, argv, NULL,
 340                   G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD |
 341                   G_SPAWN_STDERR_TO_DEV_NULL | G_SPAWN_STDOUT_TO_DEV_NULL,
 342                   NULL, NULL, NULL, NULL);
 343     g_strfreev(argv);
 344
 345     /* i'm not sure why we do this, kwin does it, but ksplash doesn't seem to
 346        hear it anyways. perhaps it is for old ksplash. or new ksplash. or
 347        something. oh well. */
 348     e.xclient.type = ClientMessage;
 349     e.xclient.display = obt_display;
 350     e.xclient.window = obt_root(ob_screen);
 351     e.xclient.message_type =
 352         XInternAtom(obt_display, "_KDE_SPLASH_PROGRESS", False);
 353     e.xclient.format = 8;
 354     strcpy(e.xclient.data.b, "wm started");
 355     XSendEvent(obt_display, obt_root(ob_screen),
 356                False, SubstructureNotifyMask, &e);
 357 }
 358
 359 void screen_startup(gboolean reconfig)
 360 {
 361     gchar **names = NULL;
 362     guint32 d;
 363     gboolean namesexist = FALSE;
 364
 365     desktop_popup = pager_popup_new();
 366     desktop_popup_perm = FALSE;
 367     pager_popup_height(desktop_popup, POPUP_HEIGHT);
 368
 369     if (reconfig) {
 370         /* update the pager popup's width */
 371         pager_popup_text_width_to_strings(desktop_popup,
 372                                           screen_desktop_names,
 373                                           screen_num_desktops);
 374         return;
 375     }
 376
 377     /* get the initial size */
 378     screen_resize();
 379
 380     /* have names already been set for the desktops? */
 381     if (OBT_PROP_GETSS_UTF8(obt_root(ob_screen), NET_DESKTOP_NAMES, &names)) {
 382         g_strfreev(names);
 383         namesexist = TRUE;
 384     }
 385
 386     /* if names don't exist and we have session names, set those.
 387        do this stuff BEFORE setting the number of desktops, because that
 388        will create default names for them
 389     */
 390     if (!namesexist && session_desktop_names != NULL) {
 391         guint i, numnames;
 392         GSList *it;
 393
 394         /* get the desktop names */
 395         numnames = g_slist_length(session_desktop_names);
 396         names = g_new(gchar*, numnames + 1);
 397         names[numnames] = NULL;
 398         for (i = 0, it = session_desktop_names; it; ++i, it = g_slist_next(it))
 399             names[i] = g_strdup(it->data);
 400
 401         /* set the root window property */
 402         OBT_PROP_SETSS(obt_root(ob_screen),
 403                        NET_DESKTOP_NAMES, (const gchar*const*)names);
 404
 405         g_strfreev(names);
 406     }
 407
 408     /* set the number of desktops, if it's not already set.
 409
 410        this will also set the default names from the config file up for
 411        desktops that don't have names yet */
 412     screen_num_desktops = 0;
 413     if (OBT_PROP_GET32(obt_root(ob_screen),
 414                        NET_NUMBER_OF_DESKTOPS, CARDINAL, &d))
 415     {
 416         if (d != config_desktops_num) {
 417             /* TRANSLATORS: If you need to specify a different order of the
 418                arguments, you can use %1$d for the first one and %2$d for the
 419                second one. For example,
 420                "The current session has %2$d desktops, but Openbox is configured for %1$d ..." */
 421             g_warning(ngettext("Openbox is configured for %d desktop, but the current session has %d.  Overriding the Openbox configuration.", "Openbox is configured for %d desktops, but the current session has %d.  Overriding the Openbox configuration.", config_desktops_num),
 422                       config_desktops_num, d);
 423         }
 424         screen_set_num_desktops(d);
 425     }
 426     /* restore from session if possible */
 427     else if (session_num_desktops)
 428         screen_set_num_desktops(session_num_desktops);
 429     else
 430         screen_set_num_desktops(config_desktops_num);
 431
 432     screen_desktop = screen_num_desktops;  /* something invalid */
 433     /* start on the current desktop when a wm was already running */
 434     if (OBT_PROP_GET32(obt_root(ob_screen),
 435                        NET_CURRENT_DESKTOP, CARDINAL, &d) &&
 436         d < screen_num_desktops)
 437     {
 438         screen_set_desktop(d, FALSE);
 439     } else if (session_desktop >= 0)
 440         screen_set_desktop(MIN((guint)session_desktop,
 441                                screen_num_desktops), FALSE);
 442     else
 443         screen_set_desktop(MIN(config_screen_firstdesk,
 444                                screen_num_desktops) - 1, FALSE);
 445     screen_last_desktop = screen_desktop;
 446
 447     /* don't start in showing-desktop mode */
 448     screen_showing_desktop = FALSE;
 449     OBT_PROP_SET32(obt_root(ob_screen),
 450                    NET_SHOWING_DESKTOP, CARDINAL, screen_showing_desktop);
 451
 452     if (session_desktop_layout_present &&
 453         screen_validate_layout(&session_desktop_layout))
 454     {
 455         screen_desktop_layout = session_desktop_layout;
 456     }
 457     else
 458         screen_update_layout();
 459 }
 460
 461 void screen_shutdown(gboolean reconfig)
 462 {
 463     pager_popup_free(desktop_popup);
 464
 465     if (reconfig)
 466         return;
 467
 468     XSelectInput(obt_display, obt_root(ob_screen), NoEventMask);
 469
 470     /* we're not running here no more! */
 471     OBT_PROP_ERASE(obt_root(ob_screen), OPENBOX_PID);
 472     /* not without us */
 473     OBT_PROP_ERASE(obt_root(ob_screen), NET_SUPPORTED);
 474     /* don't keep this mode */
 475     OBT_PROP_ERASE(obt_root(ob_screen), NET_SHOWING_DESKTOP);
 476
 477     XDestroyWindow(obt_display, screen_support_win);
 478
 479     g_strfreev(screen_desktop_names);
 480     screen_desktop_names = NULL;
 481 }
 482
 483 void screen_resize(void)
 484 {
 485     gint w, h;
 486     GList *it;
 487     gulong geometry[2];
 488
 489     w = WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen));
 490     h = HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen));
 491
 492     /* Set the _NET_DESKTOP_GEOMETRY hint */
 493     screen_physical_size.width = geometry[0] = w;
 494     screen_physical_size.height = geometry[1] = h;
 495     OBT_PROP_SETA32(obt_root(ob_screen),
 496                     NET_DESKTOP_GEOMETRY, CARDINAL, geometry, 2);
 497
 498     if (ob_state() != OB_STATE_RUNNING)
 499         return;
 500
 501     /* this calls screen_update_areas(), which we need ! */
 502     dock_configure();
 503
 504     for (it = client_list; it; it = g_list_next(it)) {
 505         client_move_onscreen(it->data, FALSE);
 506         client_reconfigure(it->data, FALSE);
 507     }
 508 }
 509
 510 void screen_set_num_desktops(guint num)
 511 {
 512     gulong *viewport;
 513     GList *it, *stacking_copy;
 514
 515     g_assert(num > 0);
 516
 517     if (screen_num_desktops == num) return;
 518
 519     screen_num_desktops = num;
 520     OBT_PROP_SET32(obt_root(ob_screen), NET_NUMBER_OF_DESKTOPS, CARDINAL, num);
 521
 522     /* set the viewport hint */
 523     viewport = g_new0(gulong, num * 2);
 524     OBT_PROP_SETA32(obt_root(ob_screen),
 525                     NET_DESKTOP_VIEWPORT, CARDINAL, viewport, num * 2);
 526     g_free(viewport);
 527
 528     /* the number of rows/columns will differ */
 529     screen_update_layout();
 530
 531     /* move windows on desktops that will no longer exist!
 532        make a copy of the list cuz we're changing it */
 533     stacking_copy = g_list_copy(stacking_list);
 534     for (it = g_list_last(stacking_copy); it; it = g_list_previous(it)) {
 535         if (WINDOW_IS_CLIENT(it->data)) {
 536             ObClient *c = it->data;
 537             if (c->desktop != DESKTOP_ALL && c->desktop >= num)
 538                 client_set_desktop(c, num - 1, FALSE, TRUE);
 539             /* raise all the windows that are on the current desktop which
 540                is being merged */
 541             else if (screen_desktop == num - 1 &&
 542                      (c->desktop == DESKTOP_ALL ||
 543                       c->desktop == screen_desktop))
 544                 stacking_raise(CLIENT_AS_WINDOW(c));
 545         }
 546     }
 547     g_list_free(stacking_copy);
 548
 549     /* change our struts/area to match (after moving windows) */
 550     screen_update_areas();
 551
 552     /* may be some unnamed desktops that we need to fill in with names
 553        (after updating the areas so the popup can resize) */
 554     screen_update_desktop_names();
 555
 556     /* change our desktop if we're on one that no longer exists! */
 557     if (screen_desktop >= screen_num_desktops)
 558         screen_set_desktop(num - 1, TRUE);
 559 }
 560
 561 static void screen_fallback_focus(void)
 562 {
 563     ObClient *c;
 564     gboolean allow_omni;
 565
 566     /* only allow omnipresent windows to get focus on desktop change if
 567        an omnipresent window is already focused (it'll keep focus probably, but
 568        maybe not depending on mouse-focus options) */
 569     allow_omni = focus_client && (client_normal(focus_client) &&
 570                                   focus_client->desktop == DESKTOP_ALL);
 571
 572     /* the client moved there already so don't move focus. prevent flicker
 573        on sendtodesktop + follow */
 574     if (focus_client && focus_client->desktop == screen_desktop)
 575         return;
 576
 577     /* have to try focus here because when you leave an empty desktop
 578        there is no focus out to watch for. also, we have different rules
 579        here. we always allow it to look under the mouse pointer if
 580        config_focus_last is FALSE
 581
 582        do this before hiding the windows so if helper windows are coming
 583        with us, they don't get hidden
 584     */
 585     if ((c = focus_fallback(TRUE, !config_focus_last, allow_omni,
 586                             !allow_omni)))
 587     {
 588         /* only do the flicker reducing stuff ahead of time if we are going
 589            to call xsetinputfocus on the window ourselves. otherwise there is
 590            no guarantee the window will actually take focus.. */
 591         if (c->can_focus) {
 592             /* reduce flicker by hiliting now rather than waiting for the
 593                server FocusIn event */
 594             frame_adjust_focus(c->frame, TRUE);
 595             /* do this here so that if you switch desktops to a window with
 596                helper windows then the helper windows won't flash */
 597             client_bring_helper_windows(c);
 598         }
 599     }
 600 }
 601
 602 static gboolean last_desktop_func(gpointer data)
 603 {
 604     screen_desktop_timeout = TRUE;
 605     screen_desktop_timer = 0;
 606     return FALSE; /* don't repeat */
 607 }
 608
 609 void screen_set_desktop(guint num, gboolean dofocus)
 610 {
 611     GList *it;
 612     guint previous;
 613     gulong ignore_start;
 614
 615     g_assert(num < screen_num_desktops);
 616
 617     previous = screen_desktop;
 618     screen_desktop = num;
 619
 620     if (previous == num) return;
 621
 622     OBT_PROP_SET32(obt_root(ob_screen), NET_CURRENT_DESKTOP, CARDINAL, num);
 623
 624     /* This whole thing decides when/how to save the screen_last_desktop so
 625        that it can be restored later if you want */
 626     if (screen_desktop_timeout) {
 627         /* If screen_desktop_timeout is true, then we've been on this desktop
 628            long enough and we can save it as the last desktop. */
 629
 630         if (screen_last_desktop == previous)
 631             /* this is the startup state only */
 632             screen_old_desktop = screen_desktop;
 633         else {
 634             /* save the "last desktop" as the "old desktop" */
 635             screen_old_desktop = screen_last_desktop;
 636             /* save the desktop we're coming from as the "last desktop" */
 637             screen_last_desktop = previous;
 638         }
 639     }
 640     else {
 641         /* If screen_desktop_timeout is false, then we just got to this desktop
 642            and we are moving away again. */
 643
 644         if (screen_desktop == screen_last_desktop) {
 645             /* If we are moving to the "last desktop" .. */
 646             if (previous == screen_old_desktop) {
 647                 /* .. from the "old desktop", change the last desktop to
 648                    be where we are coming from */
 649                 screen_last_desktop = screen_old_desktop;
 650             }
 651             else if (screen_last_desktop == screen_old_desktop) {
 652                 /* .. and also to the "old desktop", change the "last
 653                    desktop" to be where we are coming from */
 654                 screen_last_desktop = previous;
 655             }
 656             else {
 657                 /* .. from some other desktop, then set the "last desktop" to
 658                    be the saved "old desktop", i.e. where we were before the
 659                    "last desktop" */
 660                 screen_last_desktop = screen_old_desktop;
 661             }
 662         }
 663         else {
 664             /* If we are moving to any desktop besides the "last desktop"..
 665                (this is the normal case) */
 666             if (screen_desktop == screen_old_desktop) {
 667                 /* If moving to the "old desktop", which is not the
 668                    "last desktop", don't save anything */
 669             }
 670             else if (previous == screen_old_desktop) {
 671                 /* If moving from the "old desktop", and not to the
 672                    "last desktop", don't save anything */
 673             }
 674             else if (screen_last_desktop == screen_old_desktop) {
 675                 /* If the "last desktop" is the same as "old desktop" and
 676                    you're not moving to the "last desktop" then save where
 677                    we're coming from as the "last desktop" */
 678                 screen_last_desktop = previous;
 679             }
 680             else {
 681                 /* If the "last desktop" is different from the "old desktop"
 682                    and you're not moving to the "last desktop", then don't save
 683                    anything */
 684             }
 685         }
 686     }
 687     screen_desktop_timeout = FALSE;
 688     if (screen_desktop_timer) g_source_remove(screen_desktop_timer);
 689     screen_desktop_timer = g_timeout_add(REMEMBER_LAST_DESKTOP_TIME,
 690                                          last_desktop_func, NULL);
 691
 692     ob_debug("Moving to desktop %d", num+1);
 693
 694     if (ob_state() == OB_STATE_RUNNING)
 695         screen_show_desktop_popup(screen_desktop, FALSE);
 696
 697     /* ignore enter events caused by the move */
 698     ignore_start = event_start_ignore_all_enters();
 699
 700     if (moveresize_client)
 701         client_set_desktop(moveresize_client, num, TRUE, FALSE);
 702
 703     /* show windows before hiding the rest to lessen the enter/leave events */
 704
 705     /* show windows from top to bottom */
 706     for (it = stacking_list; it; it = g_list_next(it)) {
 707         if (WINDOW_IS_CLIENT(it->data)) {
 708             ObClient *c = it->data;
 709             client_show(c);
 710         }
 711     }
 712
 713     if (dofocus) screen_fallback_focus();
 714
 715     /* hide windows from bottom to top */
 716     for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
 717         if (WINDOW_IS_CLIENT(it->data)) {
 718             ObClient *c = it->data;
 719             if (client_hide(c)) {
 720                 if (c == focus_client) {
 721                     /* c was focused and we didn't do fallback clearly so make
 722                        sure openbox doesnt still consider the window focused.
 723                        this happens when using NextWindow with allDesktops,
 724                        since it doesnt want to move focus on desktop change,
 725                        but the focus is not going to stay with the current
 726                        window, which has now disappeared.
 727                        only do this if the client was actually hidden,
 728                        otherwise it can keep focus. */
 729                     focus_set_client(NULL);
 730                 }
 731             }
 732         }
 733     }
 734
 735     focus_cycle_addremove(NULL, TRUE);
 736
 737     event_end_ignore_all_enters(ignore_start);
 738
 739     if (event_source_time() != CurrentTime)
 740         screen_desktop_user_time = event_source_time();
 741 }
 742
 743 void screen_add_desktop(gboolean current)
 744 {
 745     gulong ignore_start;
 746
 747     /* ignore enter events caused by this */
 748     ignore_start = event_start_ignore_all_enters();
 749
 750     screen_set_num_desktops(screen_num_desktops+1);
 751
 752     /* move all the clients over */
 753     if (current) {
 754         GList *it;
 755
 756         for (it = client_list; it; it = g_list_next(it)) {
 757             ObClient *c = it->data;
 758             if (c->desktop != DESKTOP_ALL && c->desktop >= screen_desktop &&
 759                 /* don't move direct children, they'll be moved with their
 760                    parent - which will have to be on the same desktop */
 761                 !client_direct_parent(c))
 762             {
 763                 ob_debug("moving window %s", c->title);
 764                 client_set_desktop(c, c->desktop+1, FALSE, TRUE);
 765             }
 766         }
 767     }
 768
 769     event_end_ignore_all_enters(ignore_start);
 770 }
 771
 772 void screen_remove_desktop(gboolean current)
 773 {
 774     guint rmdesktop, movedesktop;
 775     GList *it, *stacking_copy;
 776     gulong ignore_start;
 777
 778     if (screen_num_desktops <= 1) return;
 779
 780     /* ignore enter events caused by this */
 781     ignore_start = event_start_ignore_all_enters();
 782
 783     /* what desktop are we removing and moving to? */
 784     if (current)
 785         rmdesktop = screen_desktop;
 786     else
 787         rmdesktop = screen_num_desktops - 1;
 788     if (rmdesktop < screen_num_desktops - 1)
 789         movedesktop = rmdesktop + 1;
 790     else
 791         movedesktop = rmdesktop;
 792
 793     /* make a copy of the list cuz we're changing it */
 794     stacking_copy = g_list_copy(stacking_list);
 795     for (it = g_list_last(stacking_copy); it; it = g_list_previous(it)) {
 796         if (WINDOW_IS_CLIENT(it->data)) {
 797             ObClient *c = it->data;
 798             guint d = c->desktop;
 799             if (d != DESKTOP_ALL && d >= movedesktop &&
 800                 /* don't move direct children, they'll be moved with their
 801                    parent - which will have to be on the same desktop */
 802                 !client_direct_parent(c))
 803             {
 804                 ob_debug("moving window %s", c->title);
 805                 client_set_desktop(c, c->desktop - 1, TRUE, TRUE);
 806             }
 807             /* raise all the windows that are on the current desktop which
 808                is being merged */
 809             if ((screen_desktop == rmdesktop - 1 ||
 810                  screen_desktop == rmdesktop) &&
 811                 (d == DESKTOP_ALL || d == screen_desktop))
 812             {
 813                 stacking_raise(CLIENT_AS_WINDOW(c));
 814                 ob_debug("raising window %s", c->title);
 815             }
 816         }
 817     }
 818     g_list_free(stacking_copy);
 819
 820     /* fallback focus like we're changing desktops */
 821     if (screen_desktop < screen_num_desktops - 1) {
 822         screen_fallback_focus();
 823         ob_debug("fake desktop change");
 824     }
 825
 826     screen_set_num_desktops(screen_num_desktops-1);
 827
 828     event_end_ignore_all_enters(ignore_start);
 829 }
 830
 831 static void get_row_col(guint d, guint *r, guint *c)
 832 {
 833     switch (screen_desktop_layout.orientation) {
 834     case OB_ORIENTATION_HORZ:
 835         switch (screen_desktop_layout.start_corner) {
 836         case OB_CORNER_TOPLEFT:
 837             *r = d / screen_desktop_layout.columns;
 838             *c = d % screen_desktop_layout.columns;
 839             break;
 840         case OB_CORNER_BOTTOMLEFT:
 841             *r = screen_desktop_layout.rows - 1 -
 842                 d / screen_desktop_layout.columns;
 843             *c = d % screen_desktop_layout.columns;
 844             break;
 845         case OB_CORNER_TOPRIGHT:
 846             *r = d / screen_desktop_layout.columns;
 847             *c = screen_desktop_layout.columns - 1 -
 848                 d % screen_desktop_layout.columns;
 849             break;
 850         case OB_CORNER_BOTTOMRIGHT:
 851             *r = screen_desktop_layout.rows - 1 -
 852                 d / screen_desktop_layout.columns;
 853             *c = screen_desktop_layout.columns - 1 -
 854                 d % screen_desktop_layout.columns;
 855             break;
 856         }
 857         break;
 858     case OB_ORIENTATION_VERT:
 859         switch (screen_desktop_layout.start_corner) {
 860         case OB_CORNER_TOPLEFT:
 861             *r = d % screen_desktop_layout.rows;
 862             *c = d / screen_desktop_layout.rows;
 863             break;
 864         case OB_CORNER_BOTTOMLEFT:
 865             *r = screen_desktop_layout.rows - 1 -
 866                 d % screen_desktop_layout.rows;
 867             *c = d / screen_desktop_layout.rows;
 868             break;
 869         case OB_CORNER_TOPRIGHT:
 870             *r = d % screen_desktop_layout.rows;
 871             *c = screen_desktop_layout.columns - 1 -
 872                 d / screen_desktop_layout.rows;
 873             break;
 874         case OB_CORNER_BOTTOMRIGHT:
 875             *r = screen_desktop_layout.rows - 1 -
 876                 d % screen_desktop_layout.rows;
 877             *c = screen_desktop_layout.columns - 1 -
 878                 d / screen_desktop_layout.rows;
 879             break;
 880         }
 881         break;
 882     }
 883 }
 884
 885 static guint translate_row_col(guint r, guint c)
 886 {
 887     switch (screen_desktop_layout.orientation) {
 888     case OB_ORIENTATION_HORZ:
 889         switch (screen_desktop_layout.start_corner) {
 890         case OB_CORNER_TOPLEFT:
 891             return r % screen_desktop_layout.rows *
 892                 screen_desktop_layout.columns +
 893                 c % screen_desktop_layout.columns;
 894         case OB_CORNER_BOTTOMLEFT:
 895             return (screen_desktop_layout.rows - 1 -
 896                     r % screen_desktop_layout.rows) *
 897                 screen_desktop_layout.columns +
 898                 c % screen_desktop_layout.columns;
 899         case OB_CORNER_TOPRIGHT:
 900             return r % screen_desktop_layout.rows *
 901                 screen_desktop_layout.columns +
 902                 (screen_desktop_layout.columns - 1 -
 903                  c % screen_desktop_layout.columns);
 904         case OB_CORNER_BOTTOMRIGHT:
 905             return (screen_desktop_layout.rows - 1 -
 906                     r % screen_desktop_layout.rows) *
 907                 screen_desktop_layout.columns +
 908                 (screen_desktop_layout.columns - 1 -
 909                  c % screen_desktop_layout.columns);
 910         }
 911     case OB_ORIENTATION_VERT:
 912         switch (screen_desktop_layout.start_corner) {
 913         case OB_CORNER_TOPLEFT:
 914             return c % screen_desktop_layout.columns *
 915                 screen_desktop_layout.rows +
 916                 r % screen_desktop_layout.rows;
 917         case OB_CORNER_BOTTOMLEFT:
 918             return c % screen_desktop_layout.columns *
 919                 screen_desktop_layout.rows +
 920                 (screen_desktop_layout.rows - 1 -
 921                  r % screen_desktop_layout.rows);
 922         case OB_CORNER_TOPRIGHT:
 923             return (screen_desktop_layout.columns - 1 -
 924                     c % screen_desktop_layout.columns) *
 925                 screen_desktop_layout.rows +
 926                 r % screen_desktop_layout.rows;
 927         case OB_CORNER_BOTTOMRIGHT:
 928             return (screen_desktop_layout.columns - 1 -
 929                     c % screen_desktop_layout.columns) *
 930                 screen_desktop_layout.rows +
 931                 (screen_desktop_layout.rows - 1 -
 932                  r % screen_desktop_layout.rows);
 933         }
 934     }
 935     g_assert_not_reached();
 936     return 0;
 937 }
 938
 939 static gboolean hide_desktop_popup_func(gpointer data)
 940 {
 941     pager_popup_hide(desktop_popup);
 942     desktop_popup_timer = 0;
 943     return FALSE; /* don't repeat */
 944 }
 945
 946 void screen_show_desktop_popup(guint d, gboolean perm)
 947 {
 948     const Rect *a;
 949
 950     /* 0 means don't show the popup */
 951     if (!config_desktop_popup_time) return;
 952
 953     a = screen_physical_area_primary(FALSE);
 954     pager_popup_position(desktop_popup, CenterGravity,
 955                          a->x + a->width / 2, a->y + a->height / 2);
 956     pager_popup_icon_size_multiplier(desktop_popup,
 957                                      (screen_desktop_layout.columns /
 958                                       screen_desktop_layout.rows) / 2,
 959                                      (screen_desktop_layout.rows/
 960                                       screen_desktop_layout.columns) / 2);
 961     pager_popup_max_width(desktop_popup,
 962                           MAX(a->width/3, POPUP_WIDTH));
 963     pager_popup_show(desktop_popup, screen_desktop_names[d], d);
 964
 965     if (desktop_popup_timer) g_source_remove(desktop_popup_timer);
 966     desktop_popup_timer = 0;
 967     if (!perm && !desktop_popup_perm)
 968         /* only hide if its not already being show permanently */
 969         desktop_popup_timer = g_timeout_add(config_desktop_popup_time,
 970                                             hide_desktop_popup_func,
 971                                             desktop_popup);
 972     if (perm)
 973         desktop_popup_perm = TRUE;
 974 }
 975
 976 void screen_hide_desktop_popup(void)
 977 {
 978     if (desktop_popup_timer) g_source_remove(desktop_popup_timer);
 979     desktop_popup_timer = 0;
 980     pager_popup_hide(desktop_popup);
 981     desktop_popup_perm = FALSE;
 982 }
 983
 984 guint screen_find_desktop(guint from, ObDirection dir,
 985                           gboolean wrap, gboolean linear)
 986 {
 987     guint r, c;
 988     guint d;
 989
 990     d = from;
 991     get_row_col(d, &r, &c);
 992     if (linear) {
 993         switch (dir) {
 994         case OB_DIRECTION_EAST:
 995             if (d < screen_num_desktops - 1)
 996                 ++d;
 997             else if (wrap)
 998                 d = 0;
 999             else
1000                 return from;
1001             break;
1002         case OB_DIRECTION_WEST:
1003             if (d > 0)
1004                 --d;
1005             else if (wrap)
1006                 d = screen_num_desktops - 1;
1007             else
1008                 return from;
1009             break;
1010         default:
1011             g_assert_not_reached();
1012             return from;
1013         }
1014     } else {
1015         switch (dir) {
1016         case OB_DIRECTION_EAST:
1017             ++c;
1018             if (c >= screen_desktop_layout.columns) {
1019                 if (wrap)
1020                     c = 0;
1021                 else
1022                     return from;
1023             }
1024             d = translate_row_col(r, c);
1025             if (d >= screen_num_desktops) {
1026                 if (wrap)
1027                     ++c;
1028                 else
1029                     return from;
1030             }
1031             break;
1032         case OB_DIRECTION_WEST:
1033             --c;
1034             if (c >= screen_desktop_layout.columns) {
1035                 if (wrap)
1036                     c = screen_desktop_layout.columns - 1;
1037                 else
1038                     return from;
1039             }
1040             d = translate_row_col(r, c);
1041             if (d >= screen_num_desktops) {
1042                 if (wrap)
1043                     --c;
1044                 else
1045                     return from;
1046             }
1047             break;
1048         case OB_DIRECTION_SOUTH:
1049             ++r;
1050             if (r >= screen_desktop_layout.rows) {
1051                 if (wrap)
1052                     r = 0;
1053                 else
1054                     return from;
1055             }
1056             d = translate_row_col(r, c);
1057             if (d >= screen_num_desktops) {
1058                 if (wrap)
1059                     ++r;
1060                 else
1061                     return from;
1062             }
1063             break;
1064         case OB_DIRECTION_NORTH:
1065             --r;
1066             if (r >= screen_desktop_layout.rows) {
1067                 if (wrap)
1068                     r = screen_desktop_layout.rows - 1;
1069                 else
1070                     return from;
1071             }
1072             d = translate_row_col(r, c);
1073             if (d >= screen_num_desktops) {
1074                 if (wrap)
1075                     --r;
1076                 else
1077                     return from;
1078             }
1079             break;
1080         default:
1081             g_assert_not_reached();
1082             return from;
1083         }
1084
1085         d = translate_row_col(r, c);
1086     }
1087     return d;
1088 }
1089
1090 static gboolean screen_validate_layout(ObDesktopLayout *l)
1091 {
1092     if (l->columns == 0 && l->rows == 0) /* both 0's is bad data.. */
1093         return FALSE;
1094
1095     /* fill in a zero rows/columns */
1096     if (l->columns == 0) {
1097         l->columns = screen_num_desktops / l->rows;
1098         if (l->rows * l->columns < screen_num_desktops)
1099             l->columns++;
1100         if (l->rows * l->columns >= screen_num_desktops + l->columns)
1101             l->rows--;
1102     } else if (l->rows == 0) {
1103         l->rows = screen_num_desktops / l->columns;
1104         if (l->columns * l->rows < screen_num_desktops)
1105             l->rows++;
1106         if (l->columns * l->rows >= screen_num_desktops + l->rows)
1107             l->columns--;
1108     }
1109
1110     /* bounds checking */
1111     if (l->orientation == OB_ORIENTATION_HORZ) {
1112         l->columns = MIN(screen_num_desktops, l->columns);
1113         l->rows = MIN(l->rows,
1114                       (screen_num_desktops + l->columns - 1) / l->columns);
1115         l->columns = screen_num_desktops / l->rows +
1116             !!(screen_num_desktops % l->rows);
1117     } else {
1118         l->rows = MIN(screen_num_desktops, l->rows);
1119         l->columns = MIN(l->columns,
1120                          (screen_num_desktops + l->rows - 1) / l->rows);
1121         l->rows = screen_num_desktops / l->columns +
1122             !!(screen_num_desktops % l->columns);
1123     }
1124     return TRUE;
1125 }
1126
1127 void screen_update_layout(void)
1128
1129 {
1130     ObDesktopLayout l;
1131     guint32 *data;
1132     guint num;
1133
1134     screen_desktop_layout.orientation = OB_ORIENTATION_HORZ;
1135     screen_desktop_layout.start_corner = OB_CORNER_TOPLEFT;
1136     screen_desktop_layout.rows = 1;
1137     screen_desktop_layout.columns = screen_num_desktops;
1138
1139     if (OBT_PROP_GETA32(obt_root(ob_screen),
1140                         NET_DESKTOP_LAYOUT, CARDINAL, &data, &num)) {
1141         if (num == 3 || num == 4) {
1142
1143             if (data[0] == OBT_PROP_ATOM(NET_WM_ORIENTATION_VERT))
1144                 l.orientation = OB_ORIENTATION_VERT;
1145             else if (data[0] == OBT_PROP_ATOM(NET_WM_ORIENTATION_HORZ))
1146                 l.orientation = OB_ORIENTATION_HORZ;
1147             else
1148                 return;
1149
1150             if (num < 4)
1151                 l.start_corner = OB_CORNER_TOPLEFT;
1152             else {
1153                 if (data[3] == OBT_PROP_ATOM(NET_WM_TOPLEFT))
1154                     l.start_corner = OB_CORNER_TOPLEFT;
1155                 else if (data[3] == OBT_PROP_ATOM(NET_WM_TOPRIGHT))
1156                     l.start_corner = OB_CORNER_TOPRIGHT;
1157                 else if (data[3] == OBT_PROP_ATOM(NET_WM_BOTTOMRIGHT))
1158                     l.start_corner = OB_CORNER_BOTTOMRIGHT;
1159                 else if (data[3] == OBT_PROP_ATOM(NET_WM_BOTTOMLEFT))
1160                     l.start_corner = OB_CORNER_BOTTOMLEFT;
1161                 else
1162                     return;
1163             }
1164
1165             l.columns = data[1];
1166             l.rows = data[2];
1167
1168             if (screen_validate_layout(&l))
1169                 screen_desktop_layout = l;
1170
1171             g_free(data);
1172         }
1173     }
1174 }
1175
1176 void screen_update_desktop_names(void)
1177 {
1178     guint i;
1179
1180     /* empty the array */
1181     g_strfreev(screen_desktop_names);
1182     screen_desktop_names = NULL;
1183
1184     if (OBT_PROP_GETSS(obt_root(ob_screen),
1185                        NET_DESKTOP_NAMES, &screen_desktop_names))
1186         for (i = 0; screen_desktop_names[i] && i < screen_num_desktops; ++i);
1187     else
1188         i = 0;
1189     if (i < screen_num_desktops) {
1190         GSList *it;
1191
1192         screen_desktop_names = g_renew(gchar*, screen_desktop_names,
1193                                        screen_num_desktops + 1);
1194         screen_desktop_names[screen_num_desktops] = NULL;
1195
1196         it = g_slist_nth(config_desktops_names, i);
1197
1198         for (; i < screen_num_desktops; ++i) {
1199             if (it && ((char*)it->data)[0]) /* not empty */
1200                 /* use the names from the config file when possible */
1201                 screen_desktop_names[i] = g_strdup(it->data);
1202             else
1203                 /* make up a nice name if it's not though */
1204                 screen_desktop_names[i] = g_strdup_printf(_("desktop %i"),
1205                                                           i + 1);
1206             if (it) it = g_slist_next(it);
1207         }
1208
1209         /* if we changed any names, then set the root property so we can
1210            all agree on the names */
1211         OBT_PROP_SETSS(obt_root(ob_screen), NET_DESKTOP_NAMES,
1212                        (const gchar*const*)screen_desktop_names);
1213     }
1214
1215     /* resize the pager for these names */
1216     pager_popup_text_width_to_strings(desktop_popup,
1217                                       screen_desktop_names,
1218                                       screen_num_desktops);
1219 }
1220
1221 void screen_show_desktop(gboolean show, ObClient *show_only)
1222 {
1223     GList *it;
1224
1225     if (show == screen_showing_desktop) return; /* no change */
1226
1227     screen_showing_desktop = show;
1228
1229     if (show) {
1230         /* hide windows bottom to top */
1231         for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
1232             if (WINDOW_IS_CLIENT(it->data)) {
1233                 ObClient *client = it->data;
1234                 client_showhide(client);
1235             }
1236         }
1237     }
1238     else {
1239         /* restore windows top to bottom */
1240         for (it = stacking_list; it; it = g_list_next(it)) {
1241             if (WINDOW_IS_CLIENT(it->data)) {
1242                 ObClient *client = it->data;
1243                 if (client_should_show(client)) {
1244                     if (!show_only || client == show_only)
1245                         client_show(client);
1246                     else
1247                         client_iconify(client, TRUE, FALSE, TRUE);
1248                 }
1249             }
1250         }
1251     }
1252
1253     if (show) {
1254         /* focus the desktop */
1255         for (it = focus_order; it; it = g_list_next(it)) {
1256             ObClient *c = it->data;
1257             if (c->type == OB_CLIENT_TYPE_DESKTOP &&
1258                 (c->desktop == screen_desktop || c->desktop == DESKTOP_ALL) &&
1259                 client_focus(it->data))
1260                 break;
1261         }
1262     }
1263     else if (!show_only) {
1264         ObClient *c;
1265
1266         if ((c = focus_fallback(TRUE, FALSE, TRUE, FALSE))) {
1267             /* only do the flicker reducing stuff ahead of time if we are going
1268                to call xsetinputfocus on the window ourselves. otherwise there
1269                is no guarantee the window will actually take focus.. */
1270             if (c->can_focus) {
1271                 /* reduce flicker by hiliting now rather than waiting for the
1272                    server FocusIn event */
1273                 frame_adjust_focus(c->frame, TRUE);
1274             }
1275         }
1276     }
1277
1278     show = !!show; /* make it boolean */
1279     OBT_PROP_SET32(obt_root(ob_screen), NET_SHOWING_DESKTOP, CARDINAL, show);
1280 }
1281
1282 void screen_install_colormap(ObClient *client, gboolean install)
1283 {
1284     if (client == NULL || client->colormap == None) {
1285         if (install)
1286             XInstallColormap(obt_display, RrColormap(ob_rr_inst));
1287         else
1288             XUninstallColormap(obt_display, RrColormap(ob_rr_inst));
1289     } else {
1290         obt_display_ignore_errors(TRUE);
1291         if (install)
1292             XInstallColormap(obt_display, client->colormap);
1293         else
1294             XUninstallColormap(obt_display, client->colormap);
1295         obt_display_ignore_errors(FALSE);
1296     }
1297 }
1298
1299 typedef struct {
1300     guint desktop;
1301     StrutPartial *strut;
1302 } ObScreenStrut;
1303
1304 #define RESET_STRUT_LIST(sl) \
1305     while (sl) { \
1306         g_slice_free(ObScreenStrut, (sl)->data); \
1307         sl = g_slist_delete_link(sl, sl); \
1308     }
1309
1310 #define ADD_STRUT_TO_LIST(sl, d, s) \
1311 { \
1312     ObScreenStrut *ss = g_slice_new(ObScreenStrut); \
1313     ss->desktop = d; \
1314     ss->strut = s;  \
1315     sl = g_slist_prepend(sl, ss); \
1316 }
1317
1318 #define VALIDATE_STRUTS(sl, side, max) \
1319 { \
1320     GSList *it; \
1321     for (it = sl; it; it = g_slist_next(it)) { \
1322       ObScreenStrut *ss = it->data; \
1323       ss->strut->side = MIN(max, ss->strut->side); \
1324     } \
1325 }
1326
1327 static void get_xinerama_screens(Rect **xin_areas, guint *nxin)
1328 {
1329     guint i;
1330     gint l, r, t, b;
1331 #ifdef XINERAMA
1332     gint n;
1333     XineramaScreenInfo *info;
1334 #endif
1335
1336     if (ob_debug_xinerama) {
1337         gint w = WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen));
1338         gint h = HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen));
1339         *nxin = 2;
1340         *xin_areas = g_new(Rect, *nxin + 1);
1341         RECT_SET((*xin_areas)[0], 0, 0, w/2, h);
1342         RECT_SET((*xin_areas)[1], w/2, 0, w-(w/2), h);
1343     }
1344 #ifdef XINERAMA
1345     else if (obt_display_extension_xinerama &&
1346              (info = XineramaQueryScreens(obt_display, &n))) {
1347         *nxin = n;
1348         *xin_areas = g_new(Rect, *nxin + 1);
1349         for (i = 0; i < *nxin; ++i)
1350             RECT_SET((*xin_areas)[i], info[i].x_org, info[i].y_org,
1351                      info[i].width, info[i].height);
1352         XFree(info);
1353     }
1354 #endif
1355     else {
1356         *nxin = 1;
1357         *xin_areas = g_new(Rect, *nxin + 1);
1358         RECT_SET((*xin_areas)[0], 0, 0,
1359                  WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen)),
1360                  HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen)));
1361     }
1362
1363     /* returns one extra with the total area in it */
1364     l = (*xin_areas)[0].x;
1365     t = (*xin_areas)[0].y;
1366     r = (*xin_areas)[0].x + (*xin_areas)[0].width - 1;
1367     b = (*xin_areas)[0].y + (*xin_areas)[0].height - 1;
1368     for (i = 1; i < *nxin; ++i) {
1369         l = MIN(l, (*xin_areas)[i].x);
1370         t = MIN(l, (*xin_areas)[i].y);
1371         r = MAX(r, (*xin_areas)[i].x + (*xin_areas)[i].width - 1);
1372         b = MAX(b, (*xin_areas)[i].y + (*xin_areas)[i].height - 1);
1373     }
1374     RECT_SET((*xin_areas)[*nxin], l, t, r - l + 1, b - t + 1);
1375
1376     for (i = 0; i < *nxin; ++i)
1377         ob_debug("Monitor %d @ %d,%d %dx%d\n", i,
1378                  (*xin_areas)[i].x, (*xin_areas)[i].y,
1379                  (*xin_areas)[i].width, (*xin_areas)[i].height);
1380     ob_debug("Full desktop @ %d,%d %dx%d\n",
1381              (*xin_areas)[i].x, (*xin_areas)[i].y,
1382              (*xin_areas)[i].width, (*xin_areas)[i].height);
1383 }
1384
1385 void screen_update_areas(void)
1386 {
1387     guint i;
1388     gulong *dims;
1389     GList *it, *onscreen;
1390
1391     /* collect the clients that are on screen */
1392     onscreen = NULL;
1393     for (it = client_list; it; it = g_list_next(it)) {
1394         if (client_monitor(it->data) != screen_num_monitors)
1395             onscreen = g_list_prepend(onscreen, it->data);
1396     }
1397
1398     g_free(monitor_area);
1399     get_xinerama_screens(&monitor_area, &screen_num_monitors);
1400
1401     /* set up the user-specified margins */
1402     config_margins.top_start = RECT_LEFT(monitor_area[screen_num_monitors]);
1403     config_margins.top_end = RECT_RIGHT(monitor_area[screen_num_monitors]);
1404     config_margins.bottom_start = RECT_LEFT(monitor_area[screen_num_monitors]);
1405     config_margins.bottom_end = RECT_RIGHT(monitor_area[screen_num_monitors]);
1406     config_margins.left_start = RECT_TOP(monitor_area[screen_num_monitors]);
1407     config_margins.left_end = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1408     config_margins.right_start = RECT_TOP(monitor_area[screen_num_monitors]);
1409     config_margins.right_end = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1410
1411     RESET_STRUT_LIST(struts_left);
1412     RESET_STRUT_LIST(struts_top);
1413     RESET_STRUT_LIST(struts_right);
1414     RESET_STRUT_LIST(struts_bottom);
1415
1416     /* collect the struts */
1417     for (it = client_list; it; it = g_list_next(it)) {
1418         ObClient *c = it->data;
1419         if (c->strut.left)
1420             ADD_STRUT_TO_LIST(struts_left, c->desktop, &c->strut);
1421         if (c->strut.top)
1422             ADD_STRUT_TO_LIST(struts_top, c->desktop, &c->strut);
1423         if (c->strut.right)
1424             ADD_STRUT_TO_LIST(struts_right, c->desktop, &c->strut);
1425         if (c->strut.bottom)
1426             ADD_STRUT_TO_LIST(struts_bottom, c->desktop, &c->strut);
1427     }
1428     if (dock_strut.left)
1429         ADD_STRUT_TO_LIST(struts_left, DESKTOP_ALL, &dock_strut);
1430     if (dock_strut.top)
1431         ADD_STRUT_TO_LIST(struts_top, DESKTOP_ALL, &dock_strut);
1432     if (dock_strut.right)
1433         ADD_STRUT_TO_LIST(struts_right, DESKTOP_ALL, &dock_strut);
1434     if (dock_strut.bottom)
1435         ADD_STRUT_TO_LIST(struts_bottom, DESKTOP_ALL, &dock_strut);
1436
1437     if (config_margins.left)
1438         ADD_STRUT_TO_LIST(struts_left, DESKTOP_ALL, &config_margins);
1439     if (config_margins.top)
1440         ADD_STRUT_TO_LIST(struts_top, DESKTOP_ALL, &config_margins);
1441     if (config_margins.right)
1442         ADD_STRUT_TO_LIST(struts_right, DESKTOP_ALL, &config_margins);
1443     if (config_margins.bottom)
1444         ADD_STRUT_TO_LIST(struts_bottom, DESKTOP_ALL, &config_margins);
1445
1446     VALIDATE_STRUTS(struts_left, left,
1447                     monitor_area[screen_num_monitors].width / 2);
1448     VALIDATE_STRUTS(struts_right, right,
1449                     monitor_area[screen_num_monitors].width / 2);
1450     VALIDATE_STRUTS(struts_top, top,
1451                     monitor_area[screen_num_monitors].height / 2);
1452     VALIDATE_STRUTS(struts_bottom, bottom,
1453                     monitor_area[screen_num_monitors].height / 2);
1454
1455     dims = g_new(gulong, 4 * screen_num_desktops);
1456     for (i = 0; i < screen_num_desktops; ++i) {
1457         Rect *area = screen_area(i, SCREEN_AREA_ALL_MONITORS, NULL);
1458         dims[i*4+0] = area->x;
1459         dims[i*4+1] = area->y;
1460         dims[i*4+2] = area->width;
1461         dims[i*4+3] = area->height;
1462         g_slice_free(Rect, area);
1463     }
1464
1465     /* set the legacy workarea hint to the union of all the monitors */
1466     OBT_PROP_SETA32(obt_root(ob_screen), NET_WORKAREA, CARDINAL,
1467                     dims, 4 * screen_num_desktops);
1468
1469     /* the area has changed, adjust all the windows if they need it */
1470     for (it = onscreen; it; it = g_list_next(it))
1471         client_reconfigure(it->data, FALSE);
1472
1473     g_free(dims);
1474 }
1475
1476 #if 0
1477 Rect* screen_area_all_monitors(guint desktop)
1478 {
1479     guint i;
1480     Rect *a;
1481
1482     a = screen_area_monitor(desktop, 0);
1483
1484     /* combine all the monitors together */
1485     for (i = 1; i < screen_num_monitors; ++i) {
1486         Rect *m = screen_area_monitor(desktop, i);
1487         gint l, r, t, b;
1488
1489         l = MIN(RECT_LEFT(*a), RECT_LEFT(*m));
1490         t = MIN(RECT_TOP(*a), RECT_TOP(*m));
1491         r = MAX(RECT_RIGHT(*a), RECT_RIGHT(*m));
1492         b = MAX(RECT_BOTTOM(*a), RECT_BOTTOM(*m));
1493
1494         RECT_SET(*a, l, t, r - l + 1, b - t + 1);
1495
1496         g_free(m);
1497     }
1498
1499     return a;
1500 }
1501 #endif
1502
1503 #define STRUT_LEFT_IN_SEARCH(s, search) \
1504     (RANGES_INTERSECT(search->y, search->height, \
1505                       s->left_start, s->left_end - s->left_start + 1))
1506 #define STRUT_RIGHT_IN_SEARCH(s, search) \
1507     (RANGES_INTERSECT(search->y, search->height, \
1508                       s->right_start, s->right_end - s->right_start + 1))
1509 #define STRUT_TOP_IN_SEARCH(s, search) \
1510     (RANGES_INTERSECT(search->x, search->width, \
1511                       s->top_start, s->top_end - s->top_start + 1))
1512 #define STRUT_BOTTOM_IN_SEARCH(s, search) \
1513     (RANGES_INTERSECT(search->x, search->width, \
1514                       s->bottom_start, s->bottom_end - s->bottom_start + 1))
1515
1516 #define STRUT_LEFT_IGNORE(s, us, search) \
1517     (head == SCREEN_AREA_ALL_MONITORS && us && \
1518      RECT_LEFT(monitor_area[i]) + s->left > RECT_LEFT(*search))
1519 #define STRUT_RIGHT_IGNORE(s, us, search) \
1520     (head == SCREEN_AREA_ALL_MONITORS && us && \
1521      RECT_RIGHT(monitor_area[i]) - s->right < RECT_RIGHT(*search))
1522 #define STRUT_TOP_IGNORE(s, us, search) \
1523     (head == SCREEN_AREA_ALL_MONITORS && us && \
1524      RECT_TOP(monitor_area[i]) + s->top > RECT_TOP(*search))
1525 #define STRUT_BOTTOM_IGNORE(s, us, search) \
1526     (head == SCREEN_AREA_ALL_MONITORS && us && \
1527      RECT_BOTTOM(monitor_area[i]) - s->bottom < RECT_BOTTOM(*search))
1528
1529 Rect* screen_area(guint desktop, guint head, Rect *search)
1530 {
1531     Rect *a;
1532     GSList *it;
1533     gint l, r, t, b;
1534     guint i, d;
1535     gboolean us = search != NULL; /* user provided search */
1536
1537     g_assert(desktop < screen_num_desktops || desktop == DESKTOP_ALL);
1538     g_assert(head < screen_num_monitors || head == SCREEN_AREA_ONE_MONITOR ||
1539              head == SCREEN_AREA_ALL_MONITORS);
1540     g_assert(!(head == SCREEN_AREA_ONE_MONITOR && search == NULL));
1541
1542     /* find any struts for this monitor
1543        which will be affecting the search area.
1544     */
1545
1546     /* search everything if search is null */
1547     if (!search) {
1548         if (head < screen_num_monitors) search = &monitor_area[head];
1549         else search = &monitor_area[screen_num_monitors];
1550     }
1551     if (head == SCREEN_AREA_ONE_MONITOR) head = screen_find_monitor(search);
1552
1553     /* al is "all left" meaning the furthest left you can get, l is our
1554        "working left" meaning our current strut edge which we're calculating
1555     */
1556
1557     /* only include monitors which the search area lines up with */
1558     if (RECT_INTERSECTS_RECT(monitor_area[screen_num_monitors], *search)) {
1559         l = RECT_RIGHT(monitor_area[screen_num_monitors]);
1560         t = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1561         r = RECT_LEFT(monitor_area[screen_num_monitors]);
1562         b = RECT_TOP(monitor_area[screen_num_monitors]);
1563         for (i = 0; i < screen_num_monitors; ++i) {
1564             /* add the monitor if applicable */
1565             if (RANGES_INTERSECT(search->x, search->width,
1566                                  monitor_area[i].x, monitor_area[i].width))
1567             {
1568                 t = MIN(t, RECT_TOP(monitor_area[i]));
1569                 b = MAX(b, RECT_BOTTOM(monitor_area[i]));
1570             }
1571             if (RANGES_INTERSECT(search->y, search->height,
1572                                  monitor_area[i].y, monitor_area[i].height))
1573             {
1574                 l = MIN(l, RECT_LEFT(monitor_area[i]));
1575                 r = MAX(r, RECT_RIGHT(monitor_area[i]));
1576             }
1577         }
1578     } else {
1579         l = RECT_LEFT(monitor_area[screen_num_monitors]);
1580         t = RECT_TOP(monitor_area[screen_num_monitors]);
1581         r = RECT_RIGHT(monitor_area[screen_num_monitors]);
1582         b = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1583     }
1584
1585     for (d = 0; d < screen_num_desktops; ++d) {
1586         if (d != desktop && desktop != DESKTOP_ALL) continue;
1587
1588         for (i = 0; i < screen_num_monitors; ++i) {
1589             if (head != SCREEN_AREA_ALL_MONITORS && head != i) continue;
1590
1591             for (it = struts_left; it; it = g_slist_next(it)) {
1592                 ObScreenStrut *s = it->data;
1593                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1594                     STRUT_LEFT_IN_SEARCH(s->strut, search) &&
1595                     !STRUT_LEFT_IGNORE(s->strut, us, search))
1596                     l = MAX(l, RECT_LEFT(monitor_area[screen_num_monitors])
1597                                + s->strut->left);
1598             }
1599             for (it = struts_top; it; it = g_slist_next(it)) {
1600                 ObScreenStrut *s = it->data;
1601                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1602                     STRUT_TOP_IN_SEARCH(s->strut, search) &&
1603                     !STRUT_TOP_IGNORE(s->strut, us, search))
1604                     t = MAX(t, RECT_TOP(monitor_area[screen_num_monitors])
1605                                + s->strut->top);
1606             }
1607             for (it = struts_right; it; it = g_slist_next(it)) {
1608                 ObScreenStrut *s = it->data;
1609                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1610                     STRUT_RIGHT_IN_SEARCH(s->strut, search) &&
1611                     !STRUT_RIGHT_IGNORE(s->strut, us, search))
1612                     r = MIN(r, RECT_RIGHT(monitor_area[screen_num_monitors])
1613                                - s->strut->right);
1614             }
1615             for (it = struts_bottom; it; it = g_slist_next(it)) {
1616                 ObScreenStrut *s = it->data;
1617                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1618                     STRUT_BOTTOM_IN_SEARCH(s->strut, search) &&
1619                     !STRUT_BOTTOM_IGNORE(s->strut, us, search))
1620                     b = MIN(b, RECT_BOTTOM(monitor_area[screen_num_monitors])
1621                                - s->strut->bottom);
1622             }
1623
1624             /* limit to this monitor */
1625             if (head == i) {
1626                 l = MAX(l, RECT_LEFT(monitor_area[i]));
1627                 t = MAX(t, RECT_TOP(monitor_area[i]));
1628                 r = MIN(r, RECT_RIGHT(monitor_area[i]));
1629                 b = MIN(b, RECT_BOTTOM(monitor_area[i]));
1630             }
1631         }
1632     }
1633
1634     a = g_slice_new(Rect);
1635     a->x = l;
1636     a->y = t;
1637     a->width = r - l + 1;
1638     a->height = b - t + 1;
1639     return a;
1640 }
1641
1642 typedef struct {
1643     Rect r;
1644     gboolean subtract;
1645 } RectArithmetic;
1646
1647 guint screen_find_monitor(const Rect *search)
1648 {
1649     guint i;
1650     guint mostpx_index = screen_num_monitors;
1651     guint mostpx = 0;
1652     guint closest_distance_index = screen_num_monitors;
1653     guint closest_distance = G_MAXUINT;
1654     GSList *counted = NULL;
1655
1656     /* we want to count the number of pixels search has on each monitor, but not
1657        double count.  so if a pixel is counted on monitor A then we should not
1658        count it again on monitor B. in the end we want to return the monitor
1659        that had the most pixels counted under this scheme.
1660
1661        this assumes that monitors earlier in the list are more desirable to be
1662        considered the search area's monitor.  we try the configured primary
1663        monitor first, so it gets the highest preference.
1664
1665        if we have counted an area A, then we want to subtract the intersection
1666        of A with the area on future monitors.
1667        but now consider if we count an area B that intersects A. we want to
1668        subtract the area B from that counted on future monitors, but not
1669        subtract the intersection of A and B twice! so we would add the
1670        intersection of A and B back, to account for it being subtracted both
1671        for A and B.
1672
1673        this is the idea behind the algorithm.  we always subtract the full area
1674        for monitor M intersected with the search area. we'll call that AREA.
1675        but then we go through the list |counted| and for each rectangle in
1676        the list that is being subtracted from future monitors, we insert a
1677        request to add back the intersection of the subtracted rect with AREA.
1678        vice versa for a rect in |counted| that is getting added back.
1679     */
1680
1681     if (config_primary_monitor_index < screen_num_monitors) {
1682         const Rect *monitor;
1683         Rect on_current_monitor;
1684         glong area;
1685
1686         monitor = screen_physical_area_monitor(config_primary_monitor_index);
1687
1688         if (RECT_INTERSECTS_RECT(*monitor, *search)) {
1689             RECT_SET_INTERSECTION(on_current_monitor, *monitor, *search);
1690             area = RECT_AREA(on_current_monitor);
1691
1692             if (area > mostpx) {
1693                 mostpx = area;
1694                 mostpx_index = config_primary_monitor_index;
1695             }
1696
1697             /* add the intersection rect on the current monitor to the
1698                counted list. that's easy for the first one, we just mark it for
1699                subtraction */
1700             {
1701                 RectArithmetic *ra = g_slice_new(RectArithmetic);
1702                 ra->r = on_current_monitor;
1703                 ra->subtract = TRUE;
1704                 counted = g_slist_prepend(counted, ra);
1705             }
1706         }
1707     }
1708
1709     for (i = 0; i < screen_num_monitors; ++i) {
1710         const Rect *monitor;
1711         Rect on_current_monitor;
1712         glong area;
1713         GSList *it;
1714
1715         monitor = screen_physical_area_monitor(i);
1716
1717         if (!RECT_INTERSECTS_RECT(*monitor, *search)) {
1718             /* If we don't intersect then find the distance between the search
1719                rect and the monitor. We'll use the closest monitor from this
1720                metric if none of the monitors intersect. */
1721             guint distance = rect_manhatten_distance(*monitor, *search);
1722
1723             if (distance < closest_distance) {
1724                 closest_distance = distance;
1725                 closest_distance_index = i;
1726             }
1727             continue;
1728         }
1729
1730         if (i == config_primary_monitor_index)
1731             continue;  /* already did this one */
1732
1733         RECT_SET_INTERSECTION(on_current_monitor, *monitor, *search);
1734         area = RECT_AREA(on_current_monitor);
1735
1736         /* remove pixels we already counted on any previous monitors. */
1737         for (it = counted; it; it = g_slist_next(it)) {
1738             RectArithmetic *ra = it->data;
1739             Rect intersection;
1740
1741             RECT_SET_INTERSECTION(intersection, ra->r, *search);
1742             if (ra->subtract) area -= RECT_AREA(intersection);
1743             else area += RECT_AREA(intersection);
1744         }
1745
1746         if (area > mostpx) {
1747             mostpx = area;
1748             mostpx_index = i;
1749         }
1750
1751         /* add the intersection rect on the current monitor I to the counted
1752            list.
1753            but now we need to compensate for every rectangle R already in the
1754            counted list, and add a new rect R' that is the intersection of
1755            R and I, but with the reverse subtraction/addition operation.
1756         */
1757         for (it = counted; it; it = g_slist_next(it)) {
1758             RectArithmetic *saved = it->data;
1759
1760             if (!RECT_INTERSECTS_RECT(saved->r, on_current_monitor))
1761                 continue;
1762             /* we are going to subtract our rect from future monitors, but
1763                part of it may already be being subtracted/added, so compensate
1764                to not double add/subtract. */
1765             RectArithmetic *reverse = g_slice_new(RectArithmetic);
1766             RECT_SET_INTERSECTION(reverse->r, saved->r, on_current_monitor);
1767             reverse->subtract = !saved->subtract;
1768             /* prepend so we can continue thru the list uninterupted */
1769             counted = g_slist_prepend(counted, reverse);
1770         }
1771         {
1772             RectArithmetic *ra = g_slice_new(RectArithmetic);
1773             ra->r = on_current_monitor;
1774             ra->subtract = TRUE;
1775             counted = g_slist_prepend(counted, ra);
1776         }
1777     }
1778
1779     while (counted) {
1780         g_slice_free(RectArithmetic, counted->data);
1781         counted = g_slist_delete_link(counted, counted);
1782     }
1783
1784     if (mostpx_index < screen_num_monitors)
1785         return mostpx_index;
1786
1787     g_assert(closest_distance_index < screen_num_monitors);
1788     return closest_distance_index;
1789 }
1790
1791 const Rect* screen_physical_area_all_monitors(void)
1792 {
1793     return screen_physical_area_monitor(screen_num_monitors);
1794 }
1795
1796 const Rect* screen_physical_area_monitor(guint head)
1797 {
1798     g_assert(head <= screen_num_monitors);
1799
1800     return &monitor_area[head];
1801 }
1802
1803 gboolean screen_physical_area_monitor_contains(guint head, Rect *search)
1804 {
1805     g_assert(head <= screen_num_monitors);
1806     g_assert(search);
1807     return RECT_INTERSECTS_RECT(monitor_area[head], *search);
1808 }
1809
1810 guint screen_monitor_active(void)
1811 {
1812     if (moveresize_client)
1813         return client_monitor(moveresize_client);
1814     else if (focus_client)
1815         return client_monitor(focus_client);
1816     else
1817         return screen_monitor_pointer();
1818 }
1819
1820 const Rect* screen_physical_area_active(void)
1821 {
1822     return screen_physical_area_monitor(screen_monitor_active());
1823 }
1824
1825 guint screen_monitor_primary(gboolean fixed)
1826 {
1827     if (config_primary_monitor_index > 0) {
1828         if (config_primary_monitor_index-1 < screen_num_monitors)
1829             return config_primary_monitor_index - 1;
1830         else
1831             return 0;
1832     }
1833     else if (fixed)
1834         return 0;
1835     else if (config_primary_monitor == OB_PLACE_MONITOR_ACTIVE)
1836         return screen_monitor_active();
1837     else /* config_primary_monitor == OB_PLACE_MONITOR_MOUSE */
1838         return screen_monitor_pointer();
1839 }
1840
1841 const Rect* screen_physical_area_primary(gboolean fixed)
1842 {
1843     return screen_physical_area_monitor(screen_monitor_primary(fixed));
1844 }
1845
1846 void screen_set_root_cursor(void)
1847 {
1848     if (sn_app_starting())
1849         XDefineCursor(obt_display, obt_root(ob_screen),
1850                       ob_cursor(OB_CURSOR_BUSYPOINTER));
1851     else
1852         XDefineCursor(obt_display, obt_root(ob_screen),
1853                       ob_cursor(OB_CURSOR_POINTER));
1854 }
1855
1856 guint screen_find_monitor_point(guint x, guint y)
1857 {
1858     Rect mon;
1859     RECT_SET(mon, x, y, 1, 1);
1860     return screen_find_monitor(&mon);
1861 }
1862
1863 guint screen_monitor_pointer()
1864 {
1865     gint x, y;
1866     if (!screen_pointer_pos(&x, &y))
1867         x = y = 0;
1868     return screen_find_monitor_point(x, y);
1869 }
1870
1871 gboolean screen_pointer_pos(gint *x, gint *y)
1872 {
1873     Window w;
1874     gint i;
1875     guint u;
1876     gboolean ret;
1877
1878     ret = !!XQueryPointer(obt_display, obt_root(ob_screen),
1879                           &w, &w, x, y, &i, &i, &u);
1880     if (!ret) {
1881         for (i = 0; i < ScreenCount(obt_display); ++i)
1882             if (i != ob_screen)
1883                 if (XQueryPointer(obt_display, obt_root(i),
1884                                   &w, &w, x, y, &i, &i, &u))
1885                     break;
1886     }
1887     return ret;
1888 }
1889
1890 gboolean screen_compare_desktops(guint a, guint b)
1891 {
1892     if (a == DESKTOP_ALL)
1893         a = screen_desktop;
1894     if (b == DESKTOP_ALL)
1895         b = screen_desktop;
1896     return a == b;
1897 }