Pileus Git - ~andy/gtk/blob - gdk/x11/gdkscreen-x11.c

   1  /*
   2  * gdkscreen-x11.c
   3  *
   4  * Copyright 2001 Sun Microsystems Inc.
   5  *
   6  * Erwann Chenede <erwann.chenede@sun.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "config.h"
  23
  24 #include "gdkscreen-x11.h"
  25 #include "gdkdisplay-x11.h"
  26 #include "gdkprivate-x11.h"
  27
  28 #include <glib.h>
  29
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include <X11/Xatom.h>
  34
  35 #ifdef HAVE_SOLARIS_XINERAMA
  36 #include <X11/extensions/xinerama.h>
  37 #endif
  38 #ifdef HAVE_XFREE_XINERAMA
  39 #include <X11/extensions/Xinerama.h>
  40 #endif
  41
  42 #ifdef HAVE_RANDR
  43 #include <X11/extensions/Xrandr.h>
  44 #endif
  45
  46 #ifdef HAVE_XFIXES
  47 #include <X11/extensions/Xfixes.h>
  48 #endif
  49
  50 static void         gdk_x11_screen_dispose     (GObject           *object);
  51 static void         gdk_x11_screen_finalize    (GObject           *object);
  52 static void         init_randr_support         (GdkScreen         *screen);
  53 static void         deinit_multihead           (GdkScreen         *screen);
  54
  55 enum
  56 {
  57   WINDOW_MANAGER_CHANGED,
  58   LAST_SIGNAL
  59 };
  60
  61 static guint signals[LAST_SIGNAL] = { 0 };
  62
  63 G_DEFINE_TYPE (GdkX11Screen, gdk_x11_screen, GDK_TYPE_SCREEN)
  64
  65 typedef struct _NetWmSupportedAtoms NetWmSupportedAtoms;
  66
  67 struct _NetWmSupportedAtoms
  68 {
  69   Atom *atoms;
  70   gulong n_atoms;
  71 };
  72
  73 struct _GdkX11Monitor
  74 {
  75   GdkRectangle  geometry;
  76   XID           output;
  77   int           width_mm;
  78   int           height_mm;
  79   char *        output_name;
  80   char *        manufacturer;
  81 };
  82
  83
  84 static void
  85 gdk_x11_screen_init (GdkX11Screen *screen)
  86 {
  87 }
  88
  89 static GdkDisplay *
  90 gdk_x11_screen_get_display (GdkScreen *screen)
  91 {
  92   return GDK_X11_SCREEN (screen)->display;
  93 }
  94
  95 static gint
  96 gdk_x11_screen_get_width (GdkScreen *screen)
  97 {
  98   return WidthOfScreen (GDK_X11_SCREEN (screen)->xscreen);
  99 }
 100
 101 static gint
 102 gdk_x11_screen_get_height (GdkScreen *screen)
 103 {
 104   return HeightOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 105 }
 106
 107 static gint
 108 gdk_x11_screen_get_width_mm (GdkScreen *screen)
 109 {
 110   return WidthMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 111 }
 112
 113 static gint
 114 gdk_x11_screen_get_height_mm (GdkScreen *screen)
 115 {
 116   return HeightMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 117 }
 118
 119 static gint
 120 gdk_x11_screen_get_number (GdkScreen *screen)
 121 {
 122   return GDK_X11_SCREEN (screen)->screen_num;
 123 }
 124
 125 static GdkWindow *
 126 gdk_x11_screen_get_root_window (GdkScreen *screen)
 127 {
 128   return GDK_X11_SCREEN (screen)->root_window;
 129 }
 130
 131 static void
 132 _gdk_x11_screen_events_uninit (GdkScreen *screen)
 133 {
 134   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 135
 136   if (x11_screen->xsettings_client)
 137     {
 138       _gdk_x11_xsettings_client_destroy (x11_screen->xsettings_client);
 139       x11_screen->xsettings_client = NULL;
 140     }
 141 }
 142
 143 static void
 144 gdk_x11_screen_dispose (GObject *object)
 145 {
 146   GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
 147   int i;
 148
 149   for (i = 0; i < 32; ++i)
 150     {
 151       if (x11_screen->subwindow_gcs[i])
 152         {
 153           XFreeGC (x11_screen->xdisplay, x11_screen->subwindow_gcs[i]);
 154           x11_screen->subwindow_gcs[i] = 0;
 155         }
 156     }
 157
 158   _gdk_x11_screen_events_uninit (GDK_SCREEN (object));
 159
 160   if (x11_screen->root_window)
 161     _gdk_window_destroy (x11_screen->root_window, TRUE);
 162
 163   G_OBJECT_CLASS (gdk_x11_screen_parent_class)->dispose (object);
 164
 165   x11_screen->xdisplay = NULL;
 166   x11_screen->xscreen = NULL;
 167   x11_screen->screen_num = -1;
 168   x11_screen->xroot_window = None;
 169   x11_screen->wmspec_check_window = None;
 170 }
 171
 172 static void
 173 gdk_x11_screen_finalize (GObject *object)
 174 {
 175   GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
 176   gint          i;
 177
 178   if (x11_screen->root_window)
 179     g_object_unref (x11_screen->root_window);
 180
 181   /* Visual Part */
 182   for (i = 0; i < x11_screen->nvisuals; i++)
 183     g_object_unref (x11_screen->visuals[i]);
 184   g_free (x11_screen->visuals);
 185   g_hash_table_destroy (x11_screen->visual_hash);
 186
 187   g_free (x11_screen->window_manager_name);
 188
 189   deinit_multihead (GDK_SCREEN (object));
 190
 191   G_OBJECT_CLASS (gdk_x11_screen_parent_class)->finalize (object);
 192 }
 193
 194 static gint
 195 gdk_x11_screen_get_n_monitors (GdkScreen *screen)
 196 {
 197   return GDK_X11_SCREEN (screen)->n_monitors;
 198 }
 199
 200 static gint
 201 gdk_x11_screen_get_primary_monitor (GdkScreen *screen)
 202 {
 203   return GDK_X11_SCREEN (screen)->primary_monitor;
 204 }
 205
 206 static gint
 207 gdk_x11_screen_get_monitor_width_mm (GdkScreen *screen,
 208                                      gint       monitor_num)
 209 {
 210   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 211
 212   return x11_screen->monitors[monitor_num].width_mm;
 213 }
 214
 215 static gint
 216 gdk_x11_screen_get_monitor_height_mm (GdkScreen *screen,
 217                                       gint       monitor_num)
 218 {
 219   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 220
 221   return x11_screen->monitors[monitor_num].height_mm;
 222 }
 223
 224 static gchar *
 225 gdk_x11_screen_get_monitor_plug_name (GdkScreen *screen,
 226                                       gint       monitor_num)
 227 {
 228   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 229
 230   return g_strdup (x11_screen->monitors[monitor_num].output_name);
 231 }
 232
 233 /**
 234  * gdk_x11_screen_get_monitor_output:
 235  * @screen: (type GdkX11Screen): a #GdkScreen
 236  * @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen)
 237  *
 238  * Gets the XID of the specified output/monitor.
 239  * If the X server does not support version 1.2 of the RANDR
 240  * extension, 0 is returned.
 241  *
 242  * Returns: the XID of the monitor
 243  *
 244  * Since: 2.14
 245  */
 246 XID
 247 gdk_x11_screen_get_monitor_output (GdkScreen *screen,
 248                                    gint       monitor_num)
 249 {
 250   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 251
 252   g_return_val_if_fail (GDK_IS_SCREEN (screen), None);
 253   g_return_val_if_fail (monitor_num >= 0, None);
 254   g_return_val_if_fail (monitor_num < x11_screen->n_monitors, None);
 255
 256   return x11_screen->monitors[monitor_num].output;
 257 }
 258
 259 static void
 260 gdk_x11_screen_get_monitor_geometry (GdkScreen    *screen,
 261                                      gint          monitor_num,
 262                                      GdkRectangle *dest)
 263 {
 264   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 265
 266   if (dest)
 267     *dest = x11_screen->monitors[monitor_num].geometry;
 268 }
 269
 270 static int
 271 get_current_desktop (GdkScreen *screen)
 272 {
 273   Display *display;
 274   Window win;
 275   Atom current_desktop, type;
 276   int format;
 277   unsigned long n_items, bytes_after;
 278   unsigned char *data_return = NULL;
 279   int workspace = 0;
 280
 281   if (!gdk_x11_screen_supports_net_wm_hint (screen,
 282                                             gdk_atom_intern_static_string ("_NET_CURRENT_DESKTOP")))
 283     return workspace;
 284
 285   display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (screen));
 286   win = XRootWindow (display, GDK_SCREEN_XNUMBER (screen));
 287
 288   current_desktop = XInternAtom (display, "_NET_CURRENT_DESKTOP", True);
 289
 290   XGetWindowProperty (display,
 291                       win,
 292                       current_desktop,
 293                       0, G_MAXLONG,
 294                       False, XA_CARDINAL,
 295                       &type, &format, &n_items, &bytes_after,
 296                       &data_return);
 297
 298   if (type == XA_CARDINAL && format == 32 && n_items > 0)
 299     workspace = (int) data_return[0];
 300
 301   if (data_return)
 302     XFree (data_return);
 303
 304   return workspace;
 305 }
 306
 307 static void
 308 get_work_area (GdkScreen    *screen,
 309                GdkRectangle *area)
 310 {
 311   Atom            workarea;
 312   Atom            type;
 313   Window          win;
 314   int             format;
 315   gulong          num;
 316   gulong          leftovers;
 317   gulong          max_len = 4 * 32;
 318   guchar         *ret_workarea;
 319   long           *workareas;
 320   int             result;
 321   int             disp_screen;
 322   int             desktop;
 323   Display        *display;
 324
 325   display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (screen));
 326   disp_screen = GDK_SCREEN_XNUMBER (screen);
 327   workarea = XInternAtom (display, "_NET_WORKAREA", True);
 328
 329   /* Defaults in case of error */
 330   area->x = 0;
 331   area->y = 0;
 332   area->width = gdk_screen_get_width (screen);
 333   area->height = gdk_screen_get_height (screen);
 334
 335   if (!gdk_x11_screen_supports_net_wm_hint (screen,
 336                                             gdk_atom_intern_static_string ("_NET_WORKAREA")))
 337     return;
 338
 339   if (workarea == None)
 340     return;
 341
 342   win = XRootWindow (display, disp_screen);
 343   result = XGetWindowProperty (display,
 344                                win,
 345                                workarea,
 346                                0,
 347                                max_len,
 348                                False,
 349                                AnyPropertyType,
 350                                &type,
 351                                &format,
 352                                &num,
 353                                &leftovers,
 354                                &ret_workarea);
 355   if (result != Success ||
 356       type == None ||
 357       format == 0 ||
 358       leftovers ||
 359       num % 4 != 0)
 360     return;
 361
 362   desktop = get_current_desktop (screen);
 363
 364   workareas = (long *) ret_workarea;
 365   area->x = workareas[desktop * 4];
 366   area->y = workareas[desktop * 4 + 1];
 367   area->width = workareas[desktop * 4 + 2];
 368   area->height = workareas[desktop * 4 + 3];
 369
 370   XFree (ret_workarea);
 371 }
 372
 373 static void
 374 gdk_x11_screen_get_monitor_workarea (GdkScreen    *screen,
 375                                      gint          monitor_num,
 376                                      GdkRectangle *dest)
 377 {
 378   GdkRectangle workarea;
 379
 380   gdk_x11_screen_get_monitor_geometry (screen, monitor_num, dest);
 381
 382   /* The EWMH constrains workarea to be a rectangle, so it
 383    * can't adequately deal with L-shaped monitor arrangements.
 384    * As a workaround, we ignore the workarea for anything
 385    * but the primary monitor. Since that is where the 'desktop
 386    * chrome' usually lives, this works ok in practice.
 387    */
 388   if (monitor_num == GDK_X11_SCREEN (screen)->primary_monitor)
 389     {
 390       get_work_area (screen, &workarea);
 391       if (gdk_rectangle_intersect (dest, &workarea, &workarea))
 392         *dest = workarea;
 393     }
 394 }
 395
 396 static GdkVisual *
 397 gdk_x11_screen_get_rgba_visual (GdkScreen *screen)
 398 {
 399   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 400
 401   return x11_screen->rgba_visual;
 402 }
 403
 404 /**
 405  * gdk_x11_screen_get_xscreen:
 406  * @screen: (type GdkX11Screen): a #GdkScreen
 407  *
 408  * Returns the screen of a #GdkScreen.
 409  *
 410  * Returns: (transfer none): an Xlib <type>Screen*</type>
 411  *
 412  * Since: 2.2
 413  */
 414 Screen *
 415 gdk_x11_screen_get_xscreen (GdkScreen *screen)
 416 {
 417   return GDK_X11_SCREEN (screen)->xscreen;
 418 }
 419
 420 /**
 421  * gdk_x11_screen_get_screen_number:
 422  * @screen: (type GdkX11Screen): a #GdkScreen
 423  *
 424  * Returns the index of a #GdkScreen.
 425  *
 426  * Returns: the position of @screen among the screens
 427  *     of its display
 428  *
 429  * Since: 2.2
 430  */
 431 int
 432 gdk_x11_screen_get_screen_number (GdkScreen *screen)
 433 {
 434   return GDK_X11_SCREEN (screen)->screen_num;
 435 }
 436
 437 static Atom
 438 get_cm_atom (GdkX11Screen *x11_screen)
 439 {
 440   return _gdk_x11_get_xatom_for_display_printf (x11_screen->display, "_NET_WM_CM_S%d", x11_screen->screen_num);
 441 }
 442
 443 static gboolean
 444 check_is_composited (GdkDisplay *display,
 445                      GdkX11Screen *x11_screen)
 446 {
 447   Window xwindow;
 448
 449   xwindow = XGetSelectionOwner (GDK_DISPLAY_XDISPLAY (display), get_cm_atom (x11_screen));
 450
 451   return xwindow != None;
 452 }
 453
 454 static void
 455 init_monitor_geometry (GdkX11Monitor *monitor,
 456                        int x, int y, int width, int height)
 457 {
 458   monitor->geometry.x = x;
 459   monitor->geometry.y = y;
 460   monitor->geometry.width = width;
 461   monitor->geometry.height = height;
 462
 463   monitor->output = None;
 464   monitor->width_mm = -1;
 465   monitor->height_mm = -1;
 466   monitor->output_name = NULL;
 467   monitor->manufacturer = NULL;
 468 }
 469
 470 static gboolean
 471 init_fake_xinerama (GdkScreen *screen)
 472 {
 473 #ifdef G_ENABLE_DEBUG
 474   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 475   XSetWindowAttributes atts;
 476   Window win;
 477   gint w, h;
 478
 479   if (!(_gdk_debug_flags & GDK_DEBUG_XINERAMA))
 480     return FALSE;
 481
 482   /* Fake Xinerama mode by splitting the screen into 4 monitors.
 483    * Also draw a little cross to make the monitor boundaries visible.
 484    */
 485   w = WidthOfScreen (x11_screen->xscreen);
 486   h = HeightOfScreen (x11_screen->xscreen);
 487
 488   x11_screen->n_monitors = 4;
 489   x11_screen->monitors = g_new0 (GdkX11Monitor, 4);
 490   init_monitor_geometry (&x11_screen->monitors[0], 0, 0, w / 2, h / 2);
 491   init_monitor_geometry (&x11_screen->monitors[1], w / 2, 0, w / 2, h / 2);
 492   init_monitor_geometry (&x11_screen->monitors[2], 0, h / 2, w / 2, h / 2);
 493   init_monitor_geometry (&x11_screen->monitors[3], w / 2, h / 2, w / 2, h / 2);
 494
 495   atts.override_redirect = 1;
 496   atts.background_pixel = WhitePixel(GDK_SCREEN_XDISPLAY (screen),
 497                                      x11_screen->screen_num);
 498   win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
 499                       x11_screen->xroot_window, 0, h / 2, w, 1, 0,
 500                       DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
 501                                    x11_screen->screen_num),
 502                       InputOutput,
 503                       DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
 504                                     x11_screen->screen_num),
 505                       CWOverrideRedirect|CWBackPixel,
 506                       &atts);
 507   XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
 508   win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
 509                       x11_screen->xroot_window, w/2 , 0, 1, h, 0,
 510                       DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
 511                                    x11_screen->screen_num),
 512                       InputOutput,
 513                       DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
 514                                     x11_screen->screen_num),
 515                       CWOverrideRedirect|CWBackPixel,
 516                       &atts);
 517   XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
 518   return TRUE;
 519 #endif
 520
 521   return FALSE;
 522 }
 523
 524 static void
 525 free_monitors (GdkX11Monitor *monitors,
 526                gint           n_monitors)
 527 {
 528   int i;
 529
 530   for (i = 0; i < n_monitors; ++i)
 531     {
 532       g_free (monitors[i].output_name);
 533       g_free (monitors[i].manufacturer);
 534     }
 535
 536   g_free (monitors);
 537 }
 538
 539 #ifdef HAVE_RANDR
 540 static int
 541 monitor_compare_function (GdkX11Monitor *monitor1,
 542                           GdkX11Monitor *monitor2)
 543 {
 544   /* Sort the leftmost/topmost monitors first.
 545    * For "cloned" monitors, sort the bigger ones first
 546    * (giving preference to taller monitors over wider
 547    * monitors)
 548    */
 549
 550   if (monitor1->geometry.x != monitor2->geometry.x)
 551     return monitor1->geometry.x - monitor2->geometry.x;
 552
 553   if (monitor1->geometry.y != monitor2->geometry.y)
 554     return monitor1->geometry.y - monitor2->geometry.y;
 555
 556   if (monitor1->geometry.height != monitor2->geometry.height)
 557     return - (monitor1->geometry.height - monitor2->geometry.height);
 558
 559   if (monitor1->geometry.width != monitor2->geometry.width)
 560     return - (monitor1->geometry.width - monitor2->geometry.width);
 561
 562   return 0;
 563 }
 564 #endif
 565
 566 static gboolean
 567 init_randr13 (GdkScreen *screen)
 568 {
 569 #ifdef HAVE_RANDR
 570   GdkDisplay *display = gdk_screen_get_display (screen);
 571   GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
 572   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 573   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 574   XRRScreenResources *resources;
 575   RROutput primary_output;
 576   RROutput first_output = None;
 577   int i;
 578   GArray *monitors;
 579   gboolean randr12_compat = FALSE;
 580
 581   if (!display_x11->have_randr13)
 582       return FALSE;
 583
 584   resources = XRRGetScreenResourcesCurrent (x11_screen->xdisplay,
 585                                             x11_screen->xroot_window);
 586   if (!resources)
 587     return FALSE;
 588
 589   monitors = g_array_sized_new (FALSE, TRUE, sizeof (GdkX11Monitor),
 590                                 resources->noutput);
 591
 592   for (i = 0; i < resources->noutput; ++i)
 593     {
 594       XRROutputInfo *output =
 595         XRRGetOutputInfo (dpy, resources, resources->outputs[i]);
 596
 597       /* Non RandR1.2 X driver have output name "default" */
 598       randr12_compat |= !g_strcmp0 (output->name, "default");
 599
 600       if (output->connection == RR_Disconnected)
 601         {
 602           XRRFreeOutputInfo (output);
 603           continue;
 604         }
 605
 606       if (output->crtc)
 607         {
 608           GdkX11Monitor monitor;
 609           XRRCrtcInfo *crtc = XRRGetCrtcInfo (dpy, resources, output->crtc);
 610
 611           monitor.geometry.x = crtc->x;
 612           monitor.geometry.y = crtc->y;
 613           monitor.geometry.width = crtc->width;
 614           monitor.geometry.height = crtc->height;
 615
 616           monitor.output = resources->outputs[i];
 617           monitor.width_mm = output->mm_width;
 618           monitor.height_mm = output->mm_height;
 619           monitor.output_name = g_strdup (output->name);
 620           /* FIXME: need EDID parser */
 621           monitor.manufacturer = NULL;
 622
 623           g_array_append_val (monitors, monitor);
 624
 625           XRRFreeCrtcInfo (crtc);
 626         }
 627
 628       XRRFreeOutputInfo (output);
 629     }
 630
 631   if (resources->noutput > 0)
 632     first_output = resources->outputs[0];
 633
 634   XRRFreeScreenResources (resources);
 635
 636   /* non RandR 1.2 X driver doesn't return any usable multihead data */
 637   if (randr12_compat)
 638     {
 639       guint n_monitors = monitors->len;
 640
 641       free_monitors ((GdkX11Monitor *)g_array_free (monitors, FALSE),
 642                      n_monitors);
 643
 644       return FALSE;
 645     }
 646
 647   g_array_sort (monitors,
 648                 (GCompareFunc) monitor_compare_function);
 649   x11_screen->n_monitors = monitors->len;
 650   x11_screen->monitors = (GdkX11Monitor *)g_array_free (monitors, FALSE);
 651
 652   x11_screen->primary_monitor = 0;
 653
 654   primary_output = XRRGetOutputPrimary (x11_screen->xdisplay,
 655                                         x11_screen->xroot_window);
 656
 657   for (i = 0; i < x11_screen->n_monitors; ++i)
 658     {
 659       if (x11_screen->monitors[i].output == primary_output)
 660         {
 661           x11_screen->primary_monitor = i;
 662           break;
 663         }
 664
 665       /* No RandR1.3+ available or no primary set, fall back to prefer LVDS as primary if present */
 666       if (primary_output == None &&
 667           g_ascii_strncasecmp (x11_screen->monitors[i].output_name, "LVDS", 4) == 0)
 668         {
 669           x11_screen->primary_monitor = i;
 670           break;
 671         }
 672
 673       /* No primary specified and no LVDS found */
 674       if (x11_screen->monitors[i].output == first_output)
 675         x11_screen->primary_monitor = i;
 676     }
 677
 678   return x11_screen->n_monitors > 0;
 679 #endif
 680
 681   return FALSE;
 682 }
 683
 684 static gboolean
 685 init_solaris_xinerama (GdkScreen *screen)
 686 {
 687 #ifdef HAVE_SOLARIS_XINERAMA
 688   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 689   int screen_no = gdk_screen_get_number (screen);
 690   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 691   XRectangle monitors[MAXFRAMEBUFFERS];
 692   unsigned char hints[16];
 693   gint result;
 694   int n_monitors;
 695   int i;
 696
 697   if (!XineramaGetState (dpy, screen_no))
 698     return FALSE;
 699
 700   result = XineramaGetInfo (dpy, screen_no, monitors, hints, &n_monitors);
 701
 702   /* Yes I know it should be Success but the current implementation
 703    * returns the num of monitor
 704    */
 705   if (result == 0)
 706     {
 707       return FALSE;
 708     }
 709
 710   x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
 711   x11_screen->n_monitors = n_monitors;
 712
 713   for (i = 0; i < n_monitors; i++)
 714     {
 715       init_monitor_geometry (&x11_screen->monitors[i],
 716                              monitors[i].x, monitors[i].y,
 717                              monitors[i].width, monitors[i].height);
 718     }
 719
 720   x11_screen->primary_monitor = 0;
 721
 722   return TRUE;
 723 #endif /* HAVE_SOLARIS_XINERAMA */
 724
 725   return FALSE;
 726 }
 727
 728 static gboolean
 729 init_xfree_xinerama (GdkScreen *screen)
 730 {
 731 #ifdef HAVE_XFREE_XINERAMA
 732   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 733   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 734   XineramaScreenInfo *monitors;
 735   int i, n_monitors;
 736
 737   if (!XineramaIsActive (dpy))
 738     return FALSE;
 739
 740   monitors = XineramaQueryScreens (dpy, &n_monitors);
 741
 742   if (n_monitors <= 0 || monitors == NULL)
 743     {
 744       /* If Xinerama doesn't think we have any monitors, try acting as
 745        * though we had no Xinerama. If the "no monitors" condition
 746        * is because XRandR 1.2 is currently switching between CRTCs,
 747        * we'll be notified again when we have our monitor back,
 748        * and can go back into Xinerama-ish mode at that point.
 749        */
 750       if (monitors)
 751         XFree (monitors);
 752
 753       return FALSE;
 754     }
 755
 756   x11_screen->n_monitors = n_monitors;
 757   x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
 758
 759   for (i = 0; i < n_monitors; ++i)
 760     {
 761       init_monitor_geometry (&x11_screen->monitors[i],
 762                              monitors[i].x_org, monitors[i].y_org,
 763                              monitors[i].width, monitors[i].height);
 764     }
 765
 766   XFree (monitors);
 767
 768   x11_screen->primary_monitor = 0;
 769
 770   return TRUE;
 771 #endif /* HAVE_XFREE_XINERAMA */
 772
 773   return FALSE;
 774 }
 775
 776 static gboolean
 777 init_solaris_xinerama_indices (GdkX11Screen *x11_screen)
 778 {
 779 #ifdef HAVE_SOLARIS_XINERAMA
 780   XRectangle    x_monitors[MAXFRAMEBUFFERS];
 781   unsigned char hints[16];
 782   gint          result;
 783   gint          monitor_num;
 784   gint          x_n_monitors;
 785   gint          i;
 786
 787   if (!XineramaGetState (x11_screen->xdisplay, x11_screen->screen_num))
 788     return FALSE;
 789
 790   result = XineramaGetInfo (x11_screen->xdisplay, x11_screen->screen_num,
 791                             x_monitors, hints, &x_n_monitors);
 792
 793   if (result == 0)
 794     return FALSE;
 795
 796
 797   for (monitor_num = 0; monitor_num < x11_screen->n_monitors; ++monitor_num)
 798     {
 799       for (i = 0; i < x_n_monitors; ++i)
 800         {
 801           if (x11_screen->monitors[monitor_num].geometry.x == x_monitors[i].x &&
 802               x11_screen->monitors[monitor_num].geometry.y == x_monitors[i].y &&
 803               x11_screen->monitors[monitor_num].geometry.width == x_monitors[i].width &&
 804               x11_screen->monitors[monitor_num].geometry.height == x_monitors[i].height)
 805             {
 806               g_hash_table_insert (x11_screen->xinerama_matches,
 807                                    GINT_TO_POINTER (monitor_num),
 808                                    GINT_TO_POINTER (i));
 809             }
 810         }
 811     }
 812   return TRUE;
 813 #endif /* HAVE_SOLARIS_XINERAMA */
 814
 815   return FALSE;
 816 }
 817
 818 static gboolean
 819 init_xfree_xinerama_indices (GdkX11Screen *x11_screen)
 820 {
 821 #ifdef HAVE_XFREE_XINERAMA
 822   XineramaScreenInfo *x_monitors;
 823   gint                monitor_num;
 824   gint                x_n_monitors;
 825   gint                i;
 826
 827   if (!XineramaIsActive (x11_screen->xdisplay))
 828     return FALSE;
 829
 830   x_monitors = XineramaQueryScreens (x11_screen->xdisplay, &x_n_monitors);
 831   if (x_n_monitors <= 0 || x_monitors == NULL)
 832     {
 833       if (x_monitors)
 834         XFree (x_monitors);
 835
 836       return FALSE;
 837     }
 838
 839   for (monitor_num = 0; monitor_num < x11_screen->n_monitors; ++monitor_num)
 840     {
 841       for (i = 0; i < x_n_monitors; ++i)
 842         {
 843           if (x11_screen->monitors[monitor_num].geometry.x == x_monitors[i].x_org &&
 844               x11_screen->monitors[monitor_num].geometry.y == x_monitors[i].y_org &&
 845               x11_screen->monitors[monitor_num].geometry.width == x_monitors[i].width &&
 846               x11_screen->monitors[monitor_num].geometry.height == x_monitors[i].height)
 847             {
 848               g_hash_table_insert (x11_screen->xinerama_matches,
 849                                    GINT_TO_POINTER (monitor_num),
 850                                    GINT_TO_POINTER (i));
 851             }
 852         }
 853     }
 854   XFree (x_monitors);
 855   return TRUE;
 856 #endif /* HAVE_XFREE_XINERAMA */
 857
 858   return FALSE;
 859 }
 860
 861 static void
 862 init_xinerama_indices (GdkX11Screen *x11_screen)
 863 {
 864   int opcode, firstevent, firsterror;
 865
 866   x11_screen->xinerama_matches = g_hash_table_new (g_direct_hash, g_direct_equal);
 867   if (XQueryExtension (x11_screen->xdisplay, "XINERAMA",
 868                        &opcode, &firstevent, &firsterror))
 869     {
 870       x11_screen->xinerama_matches = g_hash_table_new (g_direct_hash, g_direct_equal);
 871
 872       /* Solaris Xinerama first, then XFree/Xorg Xinerama
 873        * to match the order in init_multihead()
 874        */
 875       if (init_solaris_xinerama_indices (x11_screen) == FALSE)
 876         init_xfree_xinerama_indices (x11_screen);
 877     }
 878 }
 879
 880 gint
 881 _gdk_x11_screen_get_xinerama_index (GdkScreen *screen,
 882                                     gint       monitor_num)
 883 {
 884   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 885   gpointer val;
 886
 887   g_return_val_if_fail (monitor_num < x11_screen->n_monitors, -1);
 888
 889   if (x11_screen->xinerama_matches == NULL)
 890     init_xinerama_indices (x11_screen);
 891
 892   if (g_hash_table_lookup_extended (x11_screen->xinerama_matches, GINT_TO_POINTER (monitor_num), NULL, &val))
 893     return (GPOINTER_TO_INT(val));
 894
 895   return -1;
 896 }
 897
 898 void
 899 _gdk_x11_screen_get_edge_monitors (GdkScreen *screen,
 900                                    gint      *top,
 901                                    gint      *bottom,
 902                                    gint      *left,
 903                                    gint      *right)
 904 {
 905   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 906   gint          top_most_pos = HeightOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 907   gint          left_most_pos = WidthOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 908   gint          bottom_most_pos = 0;
 909   gint          right_most_pos = 0;
 910   gint          monitor_num;
 911
 912   for (monitor_num = 0; monitor_num < x11_screen->n_monitors; monitor_num++)
 913     {
 914       gint monitor_x = x11_screen->monitors[monitor_num].geometry.x;
 915       gint monitor_y = x11_screen->monitors[monitor_num].geometry.y;
 916       gint monitor_max_x = monitor_x + x11_screen->monitors[monitor_num].geometry.width;
 917       gint monitor_max_y = monitor_y + x11_screen->monitors[monitor_num].geometry.height;
 918
 919       if (left && left_most_pos > monitor_x)
 920         {
 921           left_most_pos = monitor_x;
 922           *left = monitor_num;
 923         }
 924       if (right && right_most_pos < monitor_max_x)
 925         {
 926           right_most_pos = monitor_max_x;
 927           *right = monitor_num;
 928         }
 929       if (top && top_most_pos > monitor_y)
 930         {
 931           top_most_pos = monitor_y;
 932           *top = monitor_num;
 933         }
 934       if (bottom && bottom_most_pos < monitor_max_y)
 935         {
 936           bottom_most_pos = monitor_max_y;
 937           *bottom = monitor_num;
 938         }
 939     }
 940 }
 941
 942 static void
 943 deinit_multihead (GdkScreen *screen)
 944 {
 945   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 946
 947   free_monitors (x11_screen->monitors, x11_screen->n_monitors);
 948   g_clear_pointer (&x11_screen->xinerama_matches, g_hash_table_destroy);
 949
 950   x11_screen->n_monitors = 0;
 951   x11_screen->monitors = NULL;
 952 }
 953
 954 static gboolean
 955 compare_monitor (GdkX11Monitor *m1,
 956                  GdkX11Monitor *m2)
 957 {
 958   if (m1->geometry.x != m2->geometry.x ||
 959       m1->geometry.y != m2->geometry.y ||
 960       m1->geometry.width != m2->geometry.width ||
 961       m1->geometry.height != m2->geometry.height)
 962     return FALSE;
 963
 964   if (m1->width_mm != m2->width_mm ||
 965       m1->height_mm != m2->height_mm)
 966     return FALSE;
 967
 968   if (g_strcmp0 (m1->output_name, m2->output_name) != 0)
 969     return FALSE;
 970
 971   if (g_strcmp0 (m1->manufacturer, m2->manufacturer) != 0)
 972     return FALSE;
 973
 974   return TRUE;
 975 }
 976
 977 static gboolean
 978 compare_monitors (GdkX11Monitor *monitors1, gint n_monitors1,
 979                   GdkX11Monitor *monitors2, gint n_monitors2)
 980 {
 981   gint i;
 982
 983   if (n_monitors1 != n_monitors2)
 984     return FALSE;
 985
 986   for (i = 0; i < n_monitors1; i++)
 987     {
 988       if (!compare_monitor (monitors1 + i, monitors2 + i))
 989         return FALSE;
 990     }
 991
 992   return TRUE;
 993 }
 994
 995 static void
 996 init_multihead (GdkScreen *screen)
 997 {
 998   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 999   int opcode, firstevent, firsterror;
1000
1001   /* There are four different implementations of multihead support:
1002    *
1003    *  1. Fake Xinerama for debugging purposes
1004    *  2. RandR 1.2
1005    *  3. Solaris Xinerama
1006    *  4. XFree86/Xorg Xinerama
1007    *
1008    * We use them in that order.
1009    */
1010   if (init_fake_xinerama (screen))
1011     return;
1012
1013   if (init_randr13 (screen))
1014     return;
1015
1016   if (XQueryExtension (GDK_SCREEN_XDISPLAY (screen), "XINERAMA",
1017                        &opcode, &firstevent, &firsterror))
1018     {
1019       if (init_solaris_xinerama (screen))
1020         return;
1021
1022       if (init_xfree_xinerama (screen))
1023         return;
1024     }
1025
1026   /* No multihead support of any kind for this screen */
1027   x11_screen->n_monitors = 1;
1028   x11_screen->monitors = g_new0 (GdkX11Monitor, 1);
1029   x11_screen->primary_monitor = 0;
1030
1031   init_monitor_geometry (x11_screen->monitors, 0, 0,
1032                          WidthOfScreen (x11_screen->xscreen),
1033                          HeightOfScreen (x11_screen->xscreen));
1034 }
1035
1036 GdkScreen *
1037 _gdk_x11_screen_new (GdkDisplay *display,
1038                      gint        screen_number)
1039 {
1040   GdkScreen *screen;
1041   GdkX11Screen *x11_screen;
1042   GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
1043
1044   screen = g_object_new (GDK_TYPE_X11_SCREEN, NULL);
1045
1046   x11_screen = GDK_X11_SCREEN (screen);
1047   x11_screen->display = display;
1048   x11_screen->xdisplay = display_x11->xdisplay;
1049   x11_screen->xscreen = ScreenOfDisplay (display_x11->xdisplay, screen_number);
1050   x11_screen->screen_num = screen_number;
1051   x11_screen->xroot_window = RootWindow (display_x11->xdisplay,screen_number);
1052   x11_screen->wmspec_check_window = None;
1053   /* we want this to be always non-null */
1054   x11_screen->window_manager_name = g_strdup ("unknown");
1055
1056   init_multihead (screen);
1057   init_randr_support (screen);
1058
1059   _gdk_x11_screen_init_visuals (screen);
1060   _gdk_x11_screen_init_root_window (screen);
1061
1062   return screen;
1063 }
1064
1065 /*
1066  * It is important that we first request the selection
1067  * notification, and then setup the initial state of
1068  * is_composited to avoid a race condition here.
1069  */
1070 void
1071 _gdk_x11_screen_setup (GdkScreen *screen)
1072 {
1073   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1074
1075   gdk_display_request_selection_notification (x11_screen->display,
1076                                               gdk_x11_xatom_to_atom_for_display (x11_screen->display, get_cm_atom (x11_screen)));
1077   x11_screen->is_composited = check_is_composited (x11_screen->display, x11_screen);
1078 }
1079
1080 static gboolean
1081 gdk_x11_screen_is_composited (GdkScreen *screen)
1082 {
1083   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1084
1085   return x11_screen->is_composited;
1086 }
1087
1088 static void
1089 init_randr_support (GdkScreen *screen)
1090 {
1091   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1092
1093   /* NB: This is also needed for XSettings, so don't remove. */
1094   XSelectInput (GDK_SCREEN_XDISPLAY (screen),
1095                 x11_screen->xroot_window,
1096                 StructureNotifyMask);
1097
1098 #ifdef HAVE_RANDR
1099   if (!GDK_X11_DISPLAY (gdk_screen_get_display (screen))->have_randr12)
1100     return;
1101
1102   XRRSelectInput (GDK_SCREEN_XDISPLAY (screen),
1103                   x11_screen->xroot_window,
1104                   RRScreenChangeNotifyMask
1105                   | RRCrtcChangeNotifyMask
1106                   | RROutputPropertyNotifyMask);
1107 #endif
1108 }
1109
1110 static void
1111 process_monitors_change (GdkScreen *screen)
1112 {
1113   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1114   gint           n_monitors;
1115   gint           primary_monitor;
1116   GdkX11Monitor *monitors;
1117   gboolean changed;
1118
1119   primary_monitor = x11_screen->primary_monitor;
1120   n_monitors = x11_screen->n_monitors;
1121   monitors = x11_screen->monitors;
1122
1123   x11_screen->n_monitors = 0;
1124   x11_screen->monitors = NULL;
1125
1126   init_multihead (screen);
1127
1128   changed =
1129     !compare_monitors (monitors, n_monitors,
1130                        x11_screen->monitors, x11_screen->n_monitors) ||
1131     x11_screen->primary_monitor != primary_monitor;
1132
1133
1134   free_monitors (monitors, n_monitors);
1135
1136   if (changed)
1137     g_signal_emit_by_name (screen, "monitors-changed");
1138 }
1139
1140 void
1141 _gdk_x11_screen_size_changed (GdkScreen *screen,
1142                               XEvent    *event)
1143 {
1144   gint width, height;
1145 #ifdef HAVE_RANDR
1146   GdkX11Display *display_x11;
1147 #endif
1148
1149   width = gdk_screen_get_width (screen);
1150   height = gdk_screen_get_height (screen);
1151
1152 #ifdef HAVE_RANDR
1153   display_x11 = GDK_X11_DISPLAY (gdk_screen_get_display (screen));
1154
1155   if (display_x11->have_randr13 && event->type == ConfigureNotify)
1156     return;
1157
1158   XRRUpdateConfiguration (event);
1159 #else
1160   if (event->type == ConfigureNotify)
1161     {
1162       XConfigureEvent *rcevent = (XConfigureEvent *) event;
1163       Screen        *xscreen = gdk_x11_screen_get_xscreen (screen);
1164
1165       xscreen->width   = rcevent->width;
1166       xscreen->height  = rcevent->height;
1167     }
1168   else
1169     return;
1170 #endif
1171
1172   process_monitors_change (screen);
1173
1174   if (width != gdk_screen_get_width (screen) ||
1175       height != gdk_screen_get_height (screen))
1176     g_signal_emit_by_name (screen, "size-changed");
1177 }
1178
1179 void
1180 _gdk_x11_screen_window_manager_changed (GdkScreen *screen)
1181 {
1182   g_signal_emit (screen, signals[WINDOW_MANAGER_CHANGED], 0);
1183 }
1184
1185 void
1186 _gdk_x11_screen_process_owner_change (GdkScreen *screen,
1187                                       XEvent *event)
1188 {
1189 #ifdef HAVE_XFIXES
1190   XFixesSelectionNotifyEvent *selection_event = (XFixesSelectionNotifyEvent *)event;
1191   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1192
1193   if (selection_event->selection == get_cm_atom (x11_screen))
1194     {
1195       gboolean composited = selection_event->owner != None;
1196
1197       if (composited != x11_screen->is_composited)
1198         {
1199           x11_screen->is_composited = composited;
1200
1201           g_signal_emit_by_name (screen, "composited-changed");
1202         }
1203     }
1204 #endif
1205 }
1206
1207 static gchar *
1208 substitute_screen_number (const gchar *display_name,
1209                           gint         screen_number)
1210 {
1211   GString *str;
1212   gchar   *p;
1213
1214   str = g_string_new (display_name);
1215
1216   p = strrchr (str->str, '.');
1217   if (p && p >  strchr (str->str, ':'))
1218     g_string_truncate (str, p - str->str);
1219
1220   g_string_append_printf (str, ".%d", screen_number);
1221
1222   return g_string_free (str, FALSE);
1223 }
1224
1225 static gchar *
1226 gdk_x11_screen_make_display_name (GdkScreen *screen)
1227 {
1228   const gchar *old_display;
1229
1230   old_display = gdk_display_get_name (gdk_screen_get_display (screen));
1231
1232   return substitute_screen_number (old_display,
1233                                    gdk_screen_get_number (screen));
1234 }
1235
1236 static GdkWindow *
1237 gdk_x11_screen_get_active_window (GdkScreen *screen)
1238 {
1239   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1240   GdkWindow *ret = NULL;
1241   Atom type_return;
1242   gint format_return;
1243   gulong nitems_return;
1244   gulong bytes_after_return;
1245   guchar *data = NULL;
1246
1247   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1248                                             gdk_atom_intern_static_string ("_NET_ACTIVE_WINDOW")))
1249     return NULL;
1250
1251   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1252                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1253                                                                  "_NET_ACTIVE_WINDOW"),
1254                           0, 1, False, XA_WINDOW, &type_return,
1255                           &format_return, &nitems_return,
1256                           &bytes_after_return, &data)
1257       == Success)
1258     {
1259       if ((type_return == XA_WINDOW) && (format_return == 32) && (data))
1260         {
1261           Window window = *(Window *) data;
1262
1263           if (window != None)
1264             {
1265               ret = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1266                                                             window);
1267             }
1268         }
1269     }
1270
1271   if (data)
1272     XFree (data);
1273
1274   return ret;
1275 }
1276
1277 static GList *
1278 gdk_x11_screen_get_window_stack (GdkScreen *screen)
1279 {
1280   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1281   GList *ret = NULL;
1282   Atom type_return;
1283   gint format_return;
1284   gulong nitems_return;
1285   gulong bytes_after_return;
1286   guchar *data = NULL;
1287
1288   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1289                                             gdk_atom_intern_static_string ("_NET_CLIENT_LIST_STACKING")))
1290     return NULL;
1291
1292   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1293                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1294                                                                  "_NET_CLIENT_LIST_STACKING"),
1295                           0, G_MAXLONG, False, XA_WINDOW, &type_return,
1296                           &format_return, &nitems_return,
1297                           &bytes_after_return, &data)
1298       == Success)
1299     {
1300       if ((type_return == XA_WINDOW) && (format_return == 32) &&
1301           (data) && (nitems_return > 0))
1302         {
1303           gulong *stack = (gulong *) data;
1304           GdkWindow *win;
1305           int i;
1306
1307           for (i = 0; i < nitems_return; i++)
1308             {
1309               win = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1310                                                             (Window)stack[i]);
1311
1312               if (win != NULL)
1313                 ret = g_list_append (ret, win);
1314             }
1315         }
1316     }
1317
1318   if (data)
1319     XFree (data);
1320
1321   return ret;
1322 }
1323
1324 static gboolean
1325 gdk_x11_screen_get_setting (GdkScreen   *screen,
1326                             const gchar *name,
1327                             GValue      *value)
1328 {
1329   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1330   const GValue *setting;
1331
1332   setting = _gdk_x11_xsettings_client_get_setting (x11_screen->xsettings_client, name);
1333   if (setting == NULL)
1334     goto out;
1335
1336   if (!g_value_type_transformable (G_VALUE_TYPE (setting), G_VALUE_TYPE (value)))
1337     {
1338       g_warning ("Cannot transform xsetting %s of type %s to type %s\n",
1339                  name,
1340                  g_type_name (G_VALUE_TYPE (setting)),
1341                  g_type_name (G_VALUE_TYPE (value)));
1342       goto out;
1343     }
1344
1345   g_value_transform (setting, value);
1346
1347   return TRUE;
1348
1349  out:
1350   return _gdk_x11_get_xft_setting (screen, name, value);
1351 }
1352
1353 static void
1354 cleanup_atoms(gpointer data)
1355 {
1356   NetWmSupportedAtoms *supported_atoms = data;
1357   if (supported_atoms->atoms)
1358       XFree (supported_atoms->atoms);
1359   g_free (supported_atoms);
1360 }
1361
1362 static Window
1363 get_net_supporting_wm_check (GdkX11Screen *screen,
1364                              Window        window)
1365 {
1366   GdkDisplay *display;
1367   Atom type;
1368   gint format;
1369   gulong n_items;
1370   gulong bytes_after;
1371   guchar *data;
1372   Window value;
1373
1374   display = screen->display;
1375   type = None;
1376   data = NULL;
1377   value = None;
1378
1379   gdk_x11_display_error_trap_push (display);
1380   XGetWindowProperty (screen->xdisplay, window,
1381                       gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTING_WM_CHECK"),
1382                       0, G_MAXLONG, False, XA_WINDOW, &type, &format,
1383                       &n_items, &bytes_after, &data);
1384   gdk_x11_display_error_trap_pop_ignored (display);
1385
1386   if (type == XA_WINDOW)
1387     value = *(Window *)data;
1388
1389   if (data)
1390     XFree (data);
1391
1392   return value;
1393 }
1394
1395 static void
1396 fetch_net_wm_check_window (GdkScreen *screen)
1397 {
1398   GdkX11Screen *x11_screen;
1399   GdkDisplay *display;
1400   Window window;
1401   GTimeVal tv;
1402   gint error;
1403
1404   x11_screen = GDK_X11_SCREEN (screen);
1405   display = x11_screen->display;
1406
1407   g_return_if_fail (GDK_X11_DISPLAY (display)->trusted_client);
1408
1409   if (x11_screen->wmspec_check_window != None)
1410     return; /* already have it */
1411
1412   g_get_current_time (&tv);
1413
1414   if (ABS  (tv.tv_sec - x11_screen->last_wmspec_check_time) < 15)
1415     return; /* we've checked recently */
1416
1417   window = get_net_supporting_wm_check (x11_screen, x11_screen->xroot_window);
1418   if (window == None)
1419     return;
1420
1421   if (window != get_net_supporting_wm_check (x11_screen, window))
1422     return;
1423
1424   gdk_x11_display_error_trap_push (display);
1425
1426   /* Find out if this WM goes away, so we can reset everything. */
1427   XSelectInput (x11_screen->xdisplay, window, StructureNotifyMask);
1428
1429   error = gdk_x11_display_error_trap_pop (display);
1430   if (!error)
1431     {
1432       /* We check the window property again because after XGetWindowProperty()
1433        * and before XSelectInput() the window may have been recycled in such a
1434        * way that XSelectInput() doesn't fail but the window is no longer what
1435        * we want.
1436        */
1437       if (window != get_net_supporting_wm_check (x11_screen, window))
1438         return;
1439
1440       x11_screen->wmspec_check_window = window;
1441       x11_screen->last_wmspec_check_time = tv.tv_sec;
1442       x11_screen->need_refetch_net_supported = TRUE;
1443       x11_screen->need_refetch_wm_name = TRUE;
1444
1445       /* Careful, reentrancy */
1446       _gdk_x11_screen_window_manager_changed (screen);
1447     }
1448 }
1449
1450 /**
1451  * gdk_x11_screen_supports_net_wm_hint:
1452  * @screen: (type GdkX11Screen): the relevant #GdkScreen.
1453  * @property: a property atom.
1454  *
1455  * This function is specific to the X11 backend of GDK, and indicates
1456  * whether the window manager supports a certain hint from the
1457  * Extended Window Manager Hints Specification. You can find this
1458  * specification on
1459  * <ulink url="http://www.freedesktop.org">http://www.freedesktop.org</ulink>.
1460  *
1461  * When using this function, keep in mind that the window manager
1462  * can change over time; so you shouldn't use this function in
1463  * a way that impacts persistent application state. A common bug
1464  * is that your application can start up before the window manager
1465  * does when the user logs in, and before the window manager starts
1466  * gdk_x11_screen_supports_net_wm_hint() will return %FALSE for every property.
1467  * You can monitor the window_manager_changed signal on #GdkScreen to detect
1468  * a window manager change.
1469  *
1470  * Return value: %TRUE if the window manager supports @property
1471  *
1472  * Since: 2.2
1473  **/
1474 gboolean
1475 gdk_x11_screen_supports_net_wm_hint (GdkScreen *screen,
1476                                      GdkAtom    property)
1477 {
1478   gulong i;
1479   GdkX11Screen *x11_screen;
1480   NetWmSupportedAtoms *supported_atoms;
1481   GdkDisplay *display;
1482
1483   g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
1484
1485   x11_screen = GDK_X11_SCREEN (screen);
1486   display = x11_screen->display;
1487
1488   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1489     return FALSE;
1490
1491   supported_atoms = g_object_get_data (G_OBJECT (screen), "gdk-net-wm-supported-atoms");
1492   if (!supported_atoms)
1493     {
1494       supported_atoms = g_new0 (NetWmSupportedAtoms, 1);
1495       g_object_set_data_full (G_OBJECT (screen), "gdk-net-wm-supported-atoms", supported_atoms, cleanup_atoms);
1496     }
1497
1498   fetch_net_wm_check_window (screen);
1499
1500   if (x11_screen->wmspec_check_window == None)
1501     return FALSE;
1502
1503   if (x11_screen->need_refetch_net_supported)
1504     {
1505       /* WM has changed since we last got the supported list,
1506        * refetch it.
1507        */
1508       Atom type;
1509       gint format;
1510       gulong bytes_after;
1511
1512       x11_screen->need_refetch_net_supported = FALSE;
1513
1514       if (supported_atoms->atoms)
1515         XFree (supported_atoms->atoms);
1516
1517       supported_atoms->atoms = NULL;
1518       supported_atoms->n_atoms = 0;
1519
1520       XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), x11_screen->xroot_window,
1521                           gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTED"),
1522                           0, G_MAXLONG, False, XA_ATOM, &type, &format,
1523                           &supported_atoms->n_atoms, &bytes_after,
1524                           (guchar **)&supported_atoms->atoms);
1525
1526       if (type != XA_ATOM)
1527         return FALSE;
1528     }
1529
1530   if (supported_atoms->atoms == NULL)
1531     return FALSE;
1532
1533   i = 0;
1534   while (i < supported_atoms->n_atoms)
1535     {
1536       if (supported_atoms->atoms[i] == gdk_x11_atom_to_xatom_for_display (display, property))
1537         return TRUE;
1538
1539       ++i;
1540     }
1541
1542   return FALSE;
1543 }
1544
1545 void
1546 _gdk_x11_screen_init_events (GdkScreen *screen)
1547 {
1548   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1549
1550   x11_screen->xsettings_client = _gdk_x11_xsettings_client_new (screen);
1551 }
1552
1553 /**
1554  * gdk_x11_screen_get_window_manager_name:
1555  * @screen: (type GdkX11Screen): a #GdkScreen
1556  *
1557  * Returns the name of the window manager for @screen.
1558  *
1559  * Return value: the name of the window manager screen @screen, or
1560  * "unknown" if the window manager is unknown. The string is owned by GDK
1561  * and should not be freed.
1562  *
1563  * Since: 2.2
1564  **/
1565 const char*
1566 gdk_x11_screen_get_window_manager_name (GdkScreen *screen)
1567 {
1568   GdkX11Screen *x11_screen;
1569   GdkDisplay *display;
1570
1571   x11_screen = GDK_X11_SCREEN (screen);
1572   display = x11_screen->display;
1573
1574   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1575     return x11_screen->window_manager_name;
1576
1577   fetch_net_wm_check_window (screen);
1578
1579   if (x11_screen->need_refetch_wm_name)
1580     {
1581       /* Get the name of the window manager */
1582       x11_screen->need_refetch_wm_name = FALSE;
1583
1584       g_free (x11_screen->window_manager_name);
1585       x11_screen->window_manager_name = g_strdup ("unknown");
1586
1587       if (x11_screen->wmspec_check_window != None)
1588         {
1589           Atom type;
1590           gint format;
1591           gulong n_items;
1592           gulong bytes_after;
1593           gchar *name;
1594
1595           name = NULL;
1596
1597           gdk_x11_display_error_trap_push (display);
1598
1599           XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
1600                               x11_screen->wmspec_check_window,
1601                               gdk_x11_get_xatom_by_name_for_display (display,
1602                                                                      "_NET_WM_NAME"),
1603                               0, G_MAXLONG, False,
1604                               gdk_x11_get_xatom_by_name_for_display (display,
1605                                                                      "UTF8_STRING"),
1606                               &type, &format,
1607                               &n_items, &bytes_after,
1608                               (guchar **)&name);
1609
1610           gdk_x11_display_error_trap_pop_ignored (display);
1611
1612           if (name != NULL)
1613             {
1614               g_free (x11_screen->window_manager_name);
1615               x11_screen->window_manager_name = g_strdup (name);
1616               XFree (name);
1617             }
1618         }
1619     }
1620
1621   return GDK_X11_SCREEN (screen)->window_manager_name;
1622 }
1623
1624 static void
1625 gdk_x11_screen_class_init (GdkX11ScreenClass *klass)
1626 {
1627   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1628   GdkScreenClass *screen_class = GDK_SCREEN_CLASS (klass);
1629
1630   object_class->dispose = gdk_x11_screen_dispose;
1631   object_class->finalize = gdk_x11_screen_finalize;
1632
1633   screen_class->get_display = gdk_x11_screen_get_display;
1634   screen_class->get_width = gdk_x11_screen_get_width;
1635   screen_class->get_height = gdk_x11_screen_get_height;
1636   screen_class->get_width_mm = gdk_x11_screen_get_width_mm;
1637   screen_class->get_height_mm = gdk_x11_screen_get_height_mm;
1638   screen_class->get_number = gdk_x11_screen_get_number;
1639   screen_class->get_root_window = gdk_x11_screen_get_root_window;
1640   screen_class->get_n_monitors = gdk_x11_screen_get_n_monitors;
1641   screen_class->get_primary_monitor = gdk_x11_screen_get_primary_monitor;
1642   screen_class->get_monitor_width_mm = gdk_x11_screen_get_monitor_width_mm;
1643   screen_class->get_monitor_height_mm = gdk_x11_screen_get_monitor_height_mm;
1644   screen_class->get_monitor_plug_name = gdk_x11_screen_get_monitor_plug_name;
1645   screen_class->get_monitor_geometry = gdk_x11_screen_get_monitor_geometry;
1646   screen_class->get_monitor_workarea = gdk_x11_screen_get_monitor_workarea;
1647   screen_class->get_system_visual = _gdk_x11_screen_get_system_visual;
1648   screen_class->get_rgba_visual = gdk_x11_screen_get_rgba_visual;
1649   screen_class->is_composited = gdk_x11_screen_is_composited;
1650   screen_class->make_display_name = gdk_x11_screen_make_display_name;
1651   screen_class->get_active_window = gdk_x11_screen_get_active_window;
1652   screen_class->get_window_stack = gdk_x11_screen_get_window_stack;
1653   screen_class->get_setting = gdk_x11_screen_get_setting;
1654   screen_class->visual_get_best_depth = _gdk_x11_screen_visual_get_best_depth;
1655   screen_class->visual_get_best_type = _gdk_x11_screen_visual_get_best_type;
1656   screen_class->visual_get_best = _gdk_x11_screen_visual_get_best;
1657   screen_class->visual_get_best_with_depth = _gdk_x11_screen_visual_get_best_with_depth;
1658   screen_class->visual_get_best_with_type = _gdk_x11_screen_visual_get_best_with_type;
1659   screen_class->visual_get_best_with_both = _gdk_x11_screen_visual_get_best_with_both;
1660   screen_class->query_depths = _gdk_x11_screen_query_depths;
1661   screen_class->query_visual_types = _gdk_x11_screen_query_visual_types;
1662   screen_class->list_visuals = _gdk_x11_screen_list_visuals;
1663
1664   signals[WINDOW_MANAGER_CHANGED] =
1665     g_signal_new (g_intern_static_string ("window-manager-changed"),
1666                   G_OBJECT_CLASS_TYPE (object_class),
1667                   G_SIGNAL_RUN_LAST,
1668                   G_STRUCT_OFFSET (GdkX11ScreenClass, window_manager_changed),
1669                   NULL, NULL,
1670                   g_cclosure_marshal_VOID__VOID,
1671                   G_TYPE_NONE,
1672                   0);
1673 }