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 #include "gdksettings.c"
  51
  52 static void         gdk_x11_screen_dispose     (GObject           *object);
  53 static void         gdk_x11_screen_finalize    (GObject           *object);
  54 static void         init_randr_support         (GdkScreen         *screen);
  55 static void         deinit_multihead           (GdkScreen         *screen);
  56
  57 enum
  58 {
  59   WINDOW_MANAGER_CHANGED,
  60   LAST_SIGNAL
  61 };
  62
  63 static guint signals[LAST_SIGNAL] = { 0 };
  64
  65 G_DEFINE_TYPE (GdkX11Screen, gdk_x11_screen, GDK_TYPE_SCREEN)
  66
  67 typedef struct _NetWmSupportedAtoms NetWmSupportedAtoms;
  68
  69 struct _NetWmSupportedAtoms
  70 {
  71   Atom *atoms;
  72   gulong n_atoms;
  73 };
  74
  75 struct _GdkX11Monitor
  76 {
  77   GdkRectangle  geometry;
  78   XID           output;
  79   int           width_mm;
  80   int           height_mm;
  81   char *        output_name;
  82   char *        manufacturer;
  83 };
  84
  85
  86 static void
  87 gdk_x11_screen_init (GdkX11Screen *screen)
  88 {
  89 }
  90
  91 static GdkDisplay *
  92 gdk_x11_screen_get_display (GdkScreen *screen)
  93 {
  94   return GDK_X11_SCREEN (screen)->display;
  95 }
  96
  97 static gint
  98 gdk_x11_screen_get_width (GdkScreen *screen)
  99 {
 100   return WidthOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 101 }
 102
 103 static gint
 104 gdk_x11_screen_get_height (GdkScreen *screen)
 105 {
 106   return HeightOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 107 }
 108
 109 static gint
 110 gdk_x11_screen_get_width_mm (GdkScreen *screen)
 111 {
 112   return WidthMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 113 }
 114
 115 static gint
 116 gdk_x11_screen_get_height_mm (GdkScreen *screen)
 117 {
 118   return HeightMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 119 }
 120
 121 static gint
 122 gdk_x11_screen_get_number (GdkScreen *screen)
 123 {
 124   return GDK_X11_SCREEN (screen)->screen_num;
 125 }
 126
 127 static GdkWindow *
 128 gdk_x11_screen_get_root_window (GdkScreen *screen)
 129 {
 130   return GDK_X11_SCREEN (screen)->root_window;
 131 }
 132
 133 static void
 134 _gdk_x11_screen_events_uninit (GdkScreen *screen)
 135 {
 136   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 137
 138   if (x11_screen->xsettings_client)
 139     {
 140       xsettings_client_destroy (x11_screen->xsettings_client);
 141       x11_screen->xsettings_client = NULL;
 142     }
 143 }
 144
 145 static void
 146 gdk_x11_screen_dispose (GObject *object)
 147 {
 148   GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
 149   int i;
 150
 151   for (i = 0; i < 32; ++i)
 152     {
 153       if (x11_screen->subwindow_gcs[i])
 154         {
 155           XFreeGC (x11_screen->xdisplay, x11_screen->subwindow_gcs[i]);
 156           x11_screen->subwindow_gcs[i] = 0;
 157         }
 158     }
 159
 160   _gdk_x11_screen_events_uninit (GDK_SCREEN (object));
 161
 162   if (x11_screen->root_window)
 163     _gdk_window_destroy (x11_screen->root_window, TRUE);
 164
 165   G_OBJECT_CLASS (gdk_x11_screen_parent_class)->dispose (object);
 166
 167   x11_screen->xdisplay = NULL;
 168   x11_screen->xscreen = NULL;
 169   x11_screen->screen_num = -1;
 170   x11_screen->xroot_window = None;
 171   x11_screen->wmspec_check_window = None;
 172 }
 173
 174 static void
 175 gdk_x11_screen_finalize (GObject *object)
 176 {
 177   GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
 178   gint          i;
 179
 180   if (x11_screen->root_window)
 181     g_object_unref (x11_screen->root_window);
 182
 183   /* Visual Part */
 184   for (i = 0; i < x11_screen->nvisuals; i++)
 185     g_object_unref (x11_screen->visuals[i]);
 186   g_free (x11_screen->visuals);
 187   g_hash_table_destroy (x11_screen->visual_hash);
 188
 189   g_free (x11_screen->window_manager_name);
 190
 191   deinit_multihead (GDK_SCREEN (object));
 192
 193   G_OBJECT_CLASS (gdk_x11_screen_parent_class)->finalize (object);
 194 }
 195
 196 static gint
 197 gdk_x11_screen_get_n_monitors (GdkScreen *screen)
 198 {
 199   return GDK_X11_SCREEN (screen)->n_monitors;
 200 }
 201
 202 static gint
 203 gdk_x11_screen_get_primary_monitor (GdkScreen *screen)
 204 {
 205   return GDK_X11_SCREEN (screen)->primary_monitor;
 206 }
 207
 208 static gint
 209 gdk_x11_screen_get_monitor_width_mm (GdkScreen *screen,
 210                                      gint       monitor_num)
 211 {
 212   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 213
 214   return x11_screen->monitors[monitor_num].width_mm;
 215 }
 216
 217 static gint
 218 gdk_x11_screen_get_monitor_height_mm (GdkScreen *screen,
 219                                       gint       monitor_num)
 220 {
 221   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 222
 223   return x11_screen->monitors[monitor_num].height_mm;
 224 }
 225
 226 static gchar *
 227 gdk_x11_screen_get_monitor_plug_name (GdkScreen *screen,
 228                                       gint       monitor_num)
 229 {
 230   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 231
 232   return g_strdup (x11_screen->monitors[monitor_num].output_name);
 233 }
 234
 235 /**
 236  * gdk_x11_screen_get_monitor_output:
 237  * @screen: (type GdkX11Screen): a #GdkScreen
 238  * @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen)
 239  *
 240  * Gets the XID of the specified output/monitor.
 241  * If the X server does not support version 1.2 of the RANDR
 242  * extension, 0 is returned.
 243  *
 244  * Returns: the XID of the monitor
 245  *
 246  * Since: 2.14
 247  */
 248 XID
 249 gdk_x11_screen_get_monitor_output (GdkScreen *screen,
 250                                    gint       monitor_num)
 251 {
 252   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 253
 254   g_return_val_if_fail (GDK_IS_SCREEN (screen), None);
 255   g_return_val_if_fail (monitor_num >= 0, None);
 256   g_return_val_if_fail (monitor_num < x11_screen->n_monitors, None);
 257
 258   return x11_screen->monitors[monitor_num].output;
 259 }
 260
 261 static void
 262 gdk_x11_screen_get_monitor_geometry (GdkScreen    *screen,
 263                                      gint          monitor_num,
 264                                      GdkRectangle *dest)
 265 {
 266   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 267
 268   if (dest)
 269     *dest = x11_screen->monitors[monitor_num].geometry;
 270 }
 271
 272 static int
 273 get_current_desktop (GdkScreen *screen)
 274 {
 275   Display *display;
 276   Window win;
 277   Atom current_desktop, type;
 278   int format;
 279   unsigned long n_items, bytes_after;
 280   unsigned char *data_return = NULL;
 281   int workspace = 0;
 282
 283   if (!gdk_x11_screen_supports_net_wm_hint (screen,
 284                                             gdk_atom_intern_static_string ("_NET_CURRENT_DESKTOP")))
 285     return workspace;
 286
 287   display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (screen));
 288   win = XRootWindow (display, GDK_SCREEN_XNUMBER (screen));
 289
 290   current_desktop = XInternAtom (display, "_NET_CURRENT_DESKTOP", True);
 291
 292   XGetWindowProperty (display,
 293                       win,
 294                       current_desktop,
 295                       0, G_MAXLONG,
 296                       False, XA_CARDINAL,
 297                       &type, &format, &n_items, &bytes_after,
 298                       &data_return);
 299
 300   if (type == XA_CARDINAL && format == 32 && n_items > 0)
 301     workspace = (int) data_return[0];
 302
 303   if (data_return)
 304     XFree (data_return);
 305
 306   return workspace;
 307 }
 308
 309 static void
 310 get_work_area (GdkScreen    *screen,
 311                GdkRectangle *area)
 312 {
 313   Atom            workarea;
 314   Atom            type;
 315   Window          win;
 316   int             format;
 317   gulong          num;
 318   gulong          leftovers;
 319   gulong          max_len = 4 * 32;
 320   guchar         *ret_workarea;
 321   long           *workareas;
 322   int             result;
 323   int             disp_screen;
 324   int             desktop;
 325   Display        *display;
 326
 327   display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (screen));
 328   disp_screen = GDK_SCREEN_XNUMBER (screen);
 329   workarea = XInternAtom (display, "_NET_WORKAREA", True);
 330
 331   /* Defaults in case of error */
 332   area->x = 0;
 333   area->y = 0;
 334   area->width = gdk_screen_get_width (screen);
 335   area->height = gdk_screen_get_height (screen);
 336
 337   if (!gdk_x11_screen_supports_net_wm_hint (screen,
 338                                             gdk_atom_intern_static_string ("_NET_WORKAREA")))
 339     return;
 340
 341   if (workarea == None)
 342     return;
 343
 344   win = XRootWindow (display, disp_screen);
 345   result = XGetWindowProperty (display,
 346                                win,
 347                                workarea,
 348                                0,
 349                                max_len,
 350                                False,
 351                                AnyPropertyType,
 352                                &type,
 353                                &format,
 354                                &num,
 355                                &leftovers,
 356                                &ret_workarea);
 357   if (result != Success ||
 358       type == None ||
 359       format == 0 ||
 360       leftovers ||
 361       num % 4 != 0)
 362     return;
 363
 364   desktop = get_current_desktop (screen);
 365
 366   workareas = (long *) ret_workarea;
 367   area->x = workareas[desktop * 4];
 368   area->y = workareas[desktop * 4 + 1];
 369   area->width = workareas[desktop * 4 + 2];
 370   area->height = workareas[desktop * 4 + 3];
 371
 372   XFree (ret_workarea);
 373 }
 374
 375 static void
 376 gdk_x11_screen_get_monitor_workarea (GdkScreen    *screen,
 377                                      gint          monitor_num,
 378                                      GdkRectangle *dest)
 379 {
 380   GdkRectangle workarea;
 381
 382   gdk_x11_screen_get_monitor_geometry (screen, monitor_num, dest);
 383
 384   /* The EWMH constrains workarea to be a rectangle, so it
 385    * can't adequately deal with L-shaped monitor arrangements.
 386    * As a workaround, we ignore the workarea for anything
 387    * but the primary monitor. Since that is where the 'desktop
 388    * chrome' usually lives, this works ok in practice.
 389    */
 390   if (monitor_num == GDK_X11_SCREEN (screen)->primary_monitor)
 391     {
 392       get_work_area (screen, &workarea);
 393       if (gdk_rectangle_intersect (dest, &workarea, &workarea))
 394         *dest = workarea;
 395     }
 396 }
 397
 398 static GdkVisual *
 399 gdk_x11_screen_get_rgba_visual (GdkScreen *screen)
 400 {
 401   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 402
 403   return x11_screen->rgba_visual;
 404 }
 405
 406 /**
 407  * gdk_x11_screen_get_xscreen:
 408  * @screen: (type GdkX11Screen): a #GdkScreen
 409  *
 410  * Returns the screen of a #GdkScreen.
 411  *
 412  * Returns: (transfer none): an Xlib <type>Screen*</type>
 413  *
 414  * Since: 2.2
 415  */
 416 Screen *
 417 gdk_x11_screen_get_xscreen (GdkScreen *screen)
 418 {
 419   return GDK_X11_SCREEN (screen)->xscreen;
 420 }
 421
 422 /**
 423  * gdk_x11_screen_get_screen_number:
 424  * @screen: (type GdkX11Screen): a #GdkScreen
 425  *
 426  * Returns the index of a #GdkScreen.
 427  *
 428  * Returns: the position of @screen among the screens
 429  *     of its display
 430  *
 431  * Since: 2.2
 432  */
 433 int
 434 gdk_x11_screen_get_screen_number (GdkScreen *screen)
 435 {
 436   return GDK_X11_SCREEN (screen)->screen_num;
 437 }
 438
 439 static gboolean
 440 check_is_composited (GdkDisplay *display,
 441                      GdkX11Screen *x11_screen)
 442 {
 443   Atom xselection = gdk_x11_atom_to_xatom_for_display (display, x11_screen->cm_selection_atom);
 444   Window xwindow;
 445
 446   xwindow = XGetSelectionOwner (GDK_DISPLAY_XDISPLAY (display), xselection);
 447
 448   return xwindow != None;
 449 }
 450
 451 static GdkAtom
 452 make_cm_atom (int screen_number)
 453 {
 454   gchar *name = g_strdup_printf ("_NET_WM_CM_S%d", screen_number);
 455   GdkAtom atom = gdk_atom_intern (name, FALSE);
 456   g_free (name);
 457   return atom;
 458 }
 459
 460 static void
 461 init_monitor_geometry (GdkX11Monitor *monitor,
 462                        int x, int y, int width, int height)
 463 {
 464   monitor->geometry.x = x;
 465   monitor->geometry.y = y;
 466   monitor->geometry.width = width;
 467   monitor->geometry.height = height;
 468
 469   monitor->output = None;
 470   monitor->width_mm = -1;
 471   monitor->height_mm = -1;
 472   monitor->output_name = NULL;
 473   monitor->manufacturer = NULL;
 474 }
 475
 476 static gboolean
 477 init_fake_xinerama (GdkScreen *screen)
 478 {
 479 #ifdef G_ENABLE_DEBUG
 480   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 481   XSetWindowAttributes atts;
 482   Window win;
 483   gint w, h;
 484
 485   if (!(_gdk_debug_flags & GDK_DEBUG_XINERAMA))
 486     return FALSE;
 487
 488   /* Fake Xinerama mode by splitting the screen into 4 monitors.
 489    * Also draw a little cross to make the monitor boundaries visible.
 490    */
 491   w = WidthOfScreen (x11_screen->xscreen);
 492   h = HeightOfScreen (x11_screen->xscreen);
 493
 494   x11_screen->n_monitors = 4;
 495   x11_screen->monitors = g_new0 (GdkX11Monitor, 4);
 496   init_monitor_geometry (&x11_screen->monitors[0], 0, 0, w / 2, h / 2);
 497   init_monitor_geometry (&x11_screen->monitors[1], w / 2, 0, w / 2, h / 2);
 498   init_monitor_geometry (&x11_screen->monitors[2], 0, h / 2, w / 2, h / 2);
 499   init_monitor_geometry (&x11_screen->monitors[3], w / 2, h / 2, w / 2, h / 2);
 500
 501   atts.override_redirect = 1;
 502   atts.background_pixel = WhitePixel(GDK_SCREEN_XDISPLAY (screen),
 503                                      x11_screen->screen_num);
 504   win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
 505                       x11_screen->xroot_window, 0, h / 2, w, 1, 0,
 506                       DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
 507                                    x11_screen->screen_num),
 508                       InputOutput,
 509                       DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
 510                                     x11_screen->screen_num),
 511                       CWOverrideRedirect|CWBackPixel,
 512                       &atts);
 513   XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
 514   win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
 515                       x11_screen->xroot_window, w/2 , 0, 1, h, 0,
 516                       DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
 517                                    x11_screen->screen_num),
 518                       InputOutput,
 519                       DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
 520                                     x11_screen->screen_num),
 521                       CWOverrideRedirect|CWBackPixel,
 522                       &atts);
 523   XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
 524   return TRUE;
 525 #endif
 526
 527   return FALSE;
 528 }
 529
 530 static void
 531 free_monitors (GdkX11Monitor *monitors,
 532                gint           n_monitors)
 533 {
 534   int i;
 535
 536   for (i = 0; i < n_monitors; ++i)
 537     {
 538       g_free (monitors[i].output_name);
 539       g_free (monitors[i].manufacturer);
 540     }
 541
 542   g_free (monitors);
 543 }
 544
 545 #ifdef HAVE_RANDR
 546 static int
 547 monitor_compare_function (GdkX11Monitor *monitor1,
 548                           GdkX11Monitor *monitor2)
 549 {
 550   /* Sort the leftmost/topmost monitors first.
 551    * For "cloned" monitors, sort the bigger ones first
 552    * (giving preference to taller monitors over wider
 553    * monitors)
 554    */
 555
 556   if (monitor1->geometry.x != monitor2->geometry.x)
 557     return monitor1->geometry.x - monitor2->geometry.x;
 558
 559   if (monitor1->geometry.y != monitor2->geometry.y)
 560     return monitor1->geometry.y - monitor2->geometry.y;
 561
 562   if (monitor1->geometry.height != monitor2->geometry.height)
 563     return - (monitor1->geometry.height - monitor2->geometry.height);
 564
 565   if (monitor1->geometry.width != monitor2->geometry.width)
 566     return - (monitor1->geometry.width - monitor2->geometry.width);
 567
 568   return 0;
 569 }
 570 #endif
 571
 572 static gboolean
 573 init_randr13 (GdkScreen *screen)
 574 {
 575 #ifdef HAVE_RANDR
 576   GdkDisplay *display = gdk_screen_get_display (screen);
 577   GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
 578   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 579   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 580   XRRScreenResources *resources;
 581   RROutput primary_output;
 582   RROutput first_output = None;
 583   int i;
 584   GArray *monitors;
 585   gboolean randr12_compat = FALSE;
 586
 587   if (!display_x11->have_randr13)
 588       return FALSE;
 589
 590   resources = XRRGetScreenResourcesCurrent (x11_screen->xdisplay,
 591                                             x11_screen->xroot_window);
 592   if (!resources)
 593     return FALSE;
 594
 595   monitors = g_array_sized_new (FALSE, TRUE, sizeof (GdkX11Monitor),
 596                                 resources->noutput);
 597
 598   for (i = 0; i < resources->noutput; ++i)
 599     {
 600       XRROutputInfo *output =
 601         XRRGetOutputInfo (dpy, resources, resources->outputs[i]);
 602
 603       /* Non RandR1.2 X driver have output name "default" */
 604       randr12_compat |= !g_strcmp0 (output->name, "default");
 605
 606       if (output->connection == RR_Disconnected)
 607         {
 608           XRRFreeOutputInfo (output);
 609           continue;
 610         }
 611
 612       if (output->crtc)
 613         {
 614           GdkX11Monitor monitor;
 615           XRRCrtcInfo *crtc = XRRGetCrtcInfo (dpy, resources, output->crtc);
 616
 617           monitor.geometry.x = crtc->x;
 618           monitor.geometry.y = crtc->y;
 619           monitor.geometry.width = crtc->width;
 620           monitor.geometry.height = crtc->height;
 621
 622           monitor.output = resources->outputs[i];
 623           monitor.width_mm = output->mm_width;
 624           monitor.height_mm = output->mm_height;
 625           monitor.output_name = g_strdup (output->name);
 626           /* FIXME: need EDID parser */
 627           monitor.manufacturer = NULL;
 628
 629           g_array_append_val (monitors, monitor);
 630
 631           XRRFreeCrtcInfo (crtc);
 632         }
 633
 634       XRRFreeOutputInfo (output);
 635     }
 636
 637   if (resources->noutput > 0)
 638     first_output = resources->outputs[0];
 639
 640   XRRFreeScreenResources (resources);
 641
 642   /* non RandR 1.2 X driver doesn't return any usable multihead data */
 643   if (randr12_compat)
 644     {
 645       guint n_monitors = monitors->len;
 646
 647       free_monitors ((GdkX11Monitor *)g_array_free (monitors, FALSE),
 648                      n_monitors);
 649
 650       return FALSE;
 651     }
 652
 653   g_array_sort (monitors,
 654                 (GCompareFunc) monitor_compare_function);
 655   x11_screen->n_monitors = monitors->len;
 656   x11_screen->monitors = (GdkX11Monitor *)g_array_free (monitors, FALSE);
 657
 658   x11_screen->primary_monitor = 0;
 659
 660   primary_output = XRRGetOutputPrimary (x11_screen->xdisplay,
 661                                         x11_screen->xroot_window);
 662
 663   for (i = 0; i < x11_screen->n_monitors; ++i)
 664     {
 665       if (x11_screen->monitors[i].output == primary_output)
 666         {
 667           x11_screen->primary_monitor = i;
 668           break;
 669         }
 670
 671       /* No RandR1.3+ available or no primary set, fall back to prefer LVDS as primary if present */
 672       if (primary_output == None &&
 673           g_ascii_strncasecmp (x11_screen->monitors[i].output_name, "LVDS", 4) == 0)
 674         {
 675           x11_screen->primary_monitor = i;
 676           break;
 677         }
 678
 679       /* No primary specified and no LVDS found */
 680       if (x11_screen->monitors[i].output == first_output)
 681         x11_screen->primary_monitor = i;
 682     }
 683
 684   return x11_screen->n_monitors > 0;
 685 #endif
 686
 687   return FALSE;
 688 }
 689
 690 static gboolean
 691 init_solaris_xinerama (GdkScreen *screen)
 692 {
 693 #ifdef HAVE_SOLARIS_XINERAMA
 694   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 695   int screen_no = gdk_screen_get_number (screen);
 696   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 697   XRectangle monitors[MAXFRAMEBUFFERS];
 698   unsigned char hints[16];
 699   gint result;
 700   int n_monitors;
 701   int i;
 702
 703   if (!XineramaGetState (dpy, screen_no))
 704     return FALSE;
 705
 706   result = XineramaGetInfo (dpy, screen_no, monitors, hints, &n_monitors);
 707
 708   /* Yes I know it should be Success but the current implementation
 709    * returns the num of monitor
 710    */
 711   if (result == 0)
 712     {
 713       return FALSE;
 714     }
 715
 716   x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
 717   x11_screen->n_monitors = n_monitors;
 718
 719   for (i = 0; i < n_monitors; i++)
 720     {
 721       init_monitor_geometry (&x11_screen->monitors[i],
 722                              monitors[i].x, monitors[i].y,
 723                              monitors[i].width, monitors[i].height);
 724     }
 725
 726   x11_screen->primary_monitor = 0;
 727
 728   return TRUE;
 729 #endif /* HAVE_SOLARIS_XINERAMA */
 730
 731   return FALSE;
 732 }
 733
 734 static gboolean
 735 init_xfree_xinerama (GdkScreen *screen)
 736 {
 737 #ifdef HAVE_XFREE_XINERAMA
 738   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 739   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 740   XineramaScreenInfo *monitors;
 741   int i, n_monitors;
 742
 743   if (!XineramaIsActive (dpy))
 744     return FALSE;
 745
 746   monitors = XineramaQueryScreens (dpy, &n_monitors);
 747
 748   if (n_monitors <= 0 || monitors == NULL)
 749     {
 750       /* If Xinerama doesn't think we have any monitors, try acting as
 751        * though we had no Xinerama. If the "no monitors" condition
 752        * is because XRandR 1.2 is currently switching between CRTCs,
 753        * we'll be notified again when we have our monitor back,
 754        * and can go back into Xinerama-ish mode at that point.
 755        */
 756       if (monitors)
 757         XFree (monitors);
 758
 759       return FALSE;
 760     }
 761
 762   x11_screen->n_monitors = n_monitors;
 763   x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
 764
 765   for (i = 0; i < n_monitors; ++i)
 766     {
 767       init_monitor_geometry (&x11_screen->monitors[i],
 768                              monitors[i].x_org, monitors[i].y_org,
 769                              monitors[i].width, monitors[i].height);
 770     }
 771
 772   XFree (monitors);
 773
 774   x11_screen->primary_monitor = 0;
 775
 776   return TRUE;
 777 #endif /* HAVE_XFREE_XINERAMA */
 778
 779   return FALSE;
 780 }
 781
 782 static void
 783 deinit_multihead (GdkScreen *screen)
 784 {
 785   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 786
 787   free_monitors (x11_screen->monitors, x11_screen->n_monitors);
 788
 789   x11_screen->n_monitors = 0;
 790   x11_screen->monitors = NULL;
 791 }
 792
 793 static gboolean
 794 compare_monitor (GdkX11Monitor *m1,
 795                  GdkX11Monitor *m2)
 796 {
 797   if (m1->geometry.x != m2->geometry.x ||
 798       m1->geometry.y != m2->geometry.y ||
 799       m1->geometry.width != m2->geometry.width ||
 800       m1->geometry.height != m2->geometry.height)
 801     return FALSE;
 802
 803   if (m1->width_mm != m2->width_mm ||
 804       m1->height_mm != m2->height_mm)
 805     return FALSE;
 806
 807   if (g_strcmp0 (m1->output_name, m2->output_name) != 0)
 808     return FALSE;
 809
 810   if (g_strcmp0 (m1->manufacturer, m2->manufacturer) != 0)
 811     return FALSE;
 812
 813   return TRUE;
 814 }
 815
 816 static gboolean
 817 compare_monitors (GdkX11Monitor *monitors1, gint n_monitors1,
 818                   GdkX11Monitor *monitors2, gint n_monitors2)
 819 {
 820   gint i;
 821
 822   if (n_monitors1 != n_monitors2)
 823     return FALSE;
 824
 825   for (i = 0; i < n_monitors1; i++)
 826     {
 827       if (!compare_monitor (monitors1 + i, monitors2 + i))
 828         return FALSE;
 829     }
 830
 831   return TRUE;
 832 }
 833
 834 static void
 835 init_multihead (GdkScreen *screen)
 836 {
 837   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 838   int opcode, firstevent, firsterror;
 839
 840   /* There are four different implementations of multihead support:
 841    *
 842    *  1. Fake Xinerama for debugging purposes
 843    *  2. RandR 1.2
 844    *  3. Solaris Xinerama
 845    *  4. XFree86/Xorg Xinerama
 846    *
 847    * We use them in that order.
 848    */
 849   if (init_fake_xinerama (screen))
 850     return;
 851
 852   if (init_randr13 (screen))
 853     return;
 854
 855   if (XQueryExtension (GDK_SCREEN_XDISPLAY (screen), "XINERAMA",
 856                        &opcode, &firstevent, &firsterror))
 857     {
 858       if (init_solaris_xinerama (screen))
 859         return;
 860
 861       if (init_xfree_xinerama (screen))
 862         return;
 863     }
 864
 865   /* No multihead support of any kind for this screen */
 866   x11_screen->n_monitors = 1;
 867   x11_screen->monitors = g_new0 (GdkX11Monitor, 1);
 868   x11_screen->primary_monitor = 0;
 869
 870   init_monitor_geometry (x11_screen->monitors, 0, 0,
 871                          WidthOfScreen (x11_screen->xscreen),
 872                          HeightOfScreen (x11_screen->xscreen));
 873 }
 874
 875 GdkScreen *
 876 _gdk_x11_screen_new (GdkDisplay *display,
 877                      gint        screen_number)
 878 {
 879   GdkScreen *screen;
 880   GdkX11Screen *x11_screen;
 881   GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
 882
 883   screen = g_object_new (GDK_TYPE_X11_SCREEN, NULL);
 884
 885   x11_screen = GDK_X11_SCREEN (screen);
 886   x11_screen->display = display;
 887   x11_screen->xdisplay = display_x11->xdisplay;
 888   x11_screen->xscreen = ScreenOfDisplay (display_x11->xdisplay, screen_number);
 889   x11_screen->screen_num = screen_number;
 890   x11_screen->xroot_window = RootWindow (display_x11->xdisplay,screen_number);
 891   x11_screen->wmspec_check_window = None;
 892   /* we want this to be always non-null */
 893   x11_screen->window_manager_name = g_strdup ("unknown");
 894
 895   init_multihead (screen);
 896   init_randr_support (screen);
 897
 898   _gdk_x11_screen_init_visuals (screen);
 899   _gdk_x11_screen_init_root_window (screen);
 900
 901   return screen;
 902 }
 903
 904 /*
 905  * It is important that we first request the selection
 906  * notification, and then setup the initial state of
 907  * is_composited to avoid a race condition here.
 908  */
 909 void
 910 _gdk_x11_screen_setup (GdkScreen *screen)
 911 {
 912   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 913
 914   x11_screen->cm_selection_atom = make_cm_atom (x11_screen->screen_num);
 915   gdk_display_request_selection_notification (x11_screen->display,
 916                                               x11_screen->cm_selection_atom);
 917   x11_screen->is_composited = check_is_composited (x11_screen->display, x11_screen);
 918 }
 919
 920 static gboolean
 921 gdk_x11_screen_is_composited (GdkScreen *screen)
 922 {
 923   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 924
 925   return x11_screen->is_composited;
 926 }
 927
 928 static void
 929 init_randr_support (GdkScreen *screen)
 930 {
 931   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 932
 933   XSelectInput (GDK_SCREEN_XDISPLAY (screen),
 934                 x11_screen->xroot_window,
 935                 StructureNotifyMask);
 936
 937 #ifdef HAVE_RANDR
 938   if (!GDK_X11_DISPLAY (gdk_screen_get_display (screen))->have_randr12)
 939     return;
 940
 941   XRRSelectInput (GDK_SCREEN_XDISPLAY (screen),
 942                   x11_screen->xroot_window,
 943                   RRScreenChangeNotifyMask
 944                   | RRCrtcChangeNotifyMask
 945                   | RROutputPropertyNotifyMask);
 946 #endif
 947 }
 948
 949 static void
 950 process_monitors_change (GdkScreen *screen)
 951 {
 952   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 953   gint           n_monitors;
 954   gint           primary_monitor;
 955   GdkX11Monitor *monitors;
 956   gboolean changed;
 957
 958   primary_monitor = x11_screen->primary_monitor;
 959   n_monitors = x11_screen->n_monitors;
 960   monitors = x11_screen->monitors;
 961
 962   x11_screen->n_monitors = 0;
 963   x11_screen->monitors = NULL;
 964
 965   init_multihead (screen);
 966
 967   changed =
 968     !compare_monitors (monitors, n_monitors,
 969                        x11_screen->monitors, x11_screen->n_monitors) ||
 970     x11_screen->primary_monitor != primary_monitor;
 971
 972
 973   free_monitors (monitors, n_monitors);
 974
 975   if (changed)
 976     g_signal_emit_by_name (screen, "monitors-changed");
 977 }
 978
 979 void
 980 _gdk_x11_screen_size_changed (GdkScreen *screen,
 981                               XEvent    *event)
 982 {
 983   gint width, height;
 984 #ifdef HAVE_RANDR
 985   GdkX11Display *display_x11;
 986 #endif
 987
 988   width = gdk_screen_get_width (screen);
 989   height = gdk_screen_get_height (screen);
 990
 991 #ifdef HAVE_RANDR
 992   display_x11 = GDK_X11_DISPLAY (gdk_screen_get_display (screen));
 993
 994   if (display_x11->have_randr13 && event->type == ConfigureNotify)
 995     return;
 996
 997   XRRUpdateConfiguration (event);
 998 #else
 999   if (event->type == ConfigureNotify)
1000     {
1001       XConfigureEvent *rcevent = (XConfigureEvent *) event;
1002       Screen        *xscreen = gdk_x11_screen_get_xscreen (screen);
1003
1004       xscreen->width   = rcevent->width;
1005       xscreen->height  = rcevent->height;
1006     }
1007   else
1008     return;
1009 #endif
1010
1011   process_monitors_change (screen);
1012
1013   if (width != gdk_screen_get_width (screen) ||
1014       height != gdk_screen_get_height (screen))
1015     g_signal_emit_by_name (screen, "size-changed");
1016 }
1017
1018 void
1019 _gdk_x11_screen_window_manager_changed (GdkScreen *screen)
1020 {
1021   g_signal_emit (screen, signals[WINDOW_MANAGER_CHANGED], 0);
1022 }
1023
1024 void
1025 _gdk_x11_screen_process_owner_change (GdkScreen *screen,
1026                                       XEvent *event)
1027 {
1028 #ifdef HAVE_XFIXES
1029   XFixesSelectionNotifyEvent *selection_event = (XFixesSelectionNotifyEvent *)event;
1030   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1031   Atom xcm_selection_atom = gdk_x11_atom_to_xatom_for_display (x11_screen->display,
1032                                                                x11_screen->cm_selection_atom);
1033
1034   if (selection_event->selection == xcm_selection_atom)
1035     {
1036       gboolean composited = selection_event->owner != None;
1037
1038       if (composited != x11_screen->is_composited)
1039         {
1040           x11_screen->is_composited = composited;
1041
1042           g_signal_emit_by_name (screen, "composited-changed");
1043         }
1044     }
1045 #endif
1046 }
1047
1048 static gchar *
1049 substitute_screen_number (const gchar *display_name,
1050                           gint         screen_number)
1051 {
1052   GString *str;
1053   gchar   *p;
1054
1055   str = g_string_new (display_name);
1056
1057   p = strrchr (str->str, '.');
1058   if (p && p >  strchr (str->str, ':'))
1059     g_string_truncate (str, p - str->str);
1060
1061   g_string_append_printf (str, ".%d", screen_number);
1062
1063   return g_string_free (str, FALSE);
1064 }
1065
1066 static gchar *
1067 gdk_x11_screen_make_display_name (GdkScreen *screen)
1068 {
1069   const gchar *old_display;
1070
1071   old_display = gdk_display_get_name (gdk_screen_get_display (screen));
1072
1073   return substitute_screen_number (old_display,
1074                                    gdk_screen_get_number (screen));
1075 }
1076
1077 static GdkWindow *
1078 gdk_x11_screen_get_active_window (GdkScreen *screen)
1079 {
1080   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1081   GdkWindow *ret = NULL;
1082   Atom type_return;
1083   gint format_return;
1084   gulong nitems_return;
1085   gulong bytes_after_return;
1086   guchar *data = NULL;
1087
1088   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1089                                             gdk_atom_intern_static_string ("_NET_ACTIVE_WINDOW")))
1090     return NULL;
1091
1092   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1093                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1094                                                                  "_NET_ACTIVE_WINDOW"),
1095                           0, 1, False, XA_WINDOW, &type_return,
1096                           &format_return, &nitems_return,
1097                           &bytes_after_return, &data)
1098       == Success)
1099     {
1100       if ((type_return == XA_WINDOW) && (format_return == 32) && (data))
1101         {
1102           Window window = *(Window *) data;
1103
1104           if (window != None)
1105             {
1106               ret = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1107                                                             window);
1108             }
1109         }
1110     }
1111
1112   if (data)
1113     XFree (data);
1114
1115   return ret;
1116 }
1117
1118 static GList *
1119 gdk_x11_screen_get_window_stack (GdkScreen *screen)
1120 {
1121   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1122   GList *ret = NULL;
1123   Atom type_return;
1124   gint format_return;
1125   gulong nitems_return;
1126   gulong bytes_after_return;
1127   guchar *data = NULL;
1128
1129   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1130                                             gdk_atom_intern_static_string ("_NET_CLIENT_LIST_STACKING")))
1131     return NULL;
1132
1133   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1134                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1135                                                                  "_NET_CLIENT_LIST_STACKING"),
1136                           0, G_MAXLONG, False, XA_WINDOW, &type_return,
1137                           &format_return, &nitems_return,
1138                           &bytes_after_return, &data)
1139       == Success)
1140     {
1141       if ((type_return == XA_WINDOW) && (format_return == 32) &&
1142           (data) && (nitems_return > 0))
1143         {
1144           gulong *stack = (gulong *) data;
1145           GdkWindow *win;
1146           int i;
1147
1148           for (i = 0; i < nitems_return; i++)
1149             {
1150               win = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1151                                                             (Window)stack[i]);
1152
1153               if (win != NULL)
1154                 ret = g_list_append (ret, win);
1155             }
1156         }
1157     }
1158
1159   if (data)
1160     XFree (data);
1161
1162   return ret;
1163 }
1164
1165 static gboolean
1166 check_transform (const gchar *xsettings_name,
1167                  GType        src_type,
1168                  GType        dest_type)
1169 {
1170   if (!g_value_type_transformable (src_type, dest_type))
1171     {
1172       g_warning ("Cannot transform xsetting %s of type %s to type %s\n",
1173                  xsettings_name,
1174                  g_type_name (src_type),
1175                  g_type_name (dest_type));
1176       return FALSE;
1177     }
1178   else
1179     return TRUE;
1180 }
1181
1182 static gboolean
1183 gdk_x11_screen_get_setting (GdkScreen   *screen,
1184                             const gchar *name,
1185                             GValue      *value)
1186 {
1187   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1188   const char *xsettings_name = NULL;
1189   XSettingsResult result;
1190   XSettingsSetting *setting = NULL;
1191   gboolean success = FALSE;
1192   gint i;
1193   GValue tmp_val = G_VALUE_INIT;
1194
1195   for (i = 0; i < GDK_SETTINGS_N_ELEMENTS(); i++)
1196     if (strcmp (GDK_SETTINGS_GDK_NAME (i), name) == 0)
1197       {
1198         xsettings_name = GDK_SETTINGS_X_NAME (i);
1199         break;
1200       }
1201
1202   if (!xsettings_name)
1203     goto out;
1204
1205   result = xsettings_client_get_setting (x11_screen->xsettings_client,
1206                                          xsettings_name, &setting);
1207   if (result != XSETTINGS_SUCCESS)
1208     goto out;
1209
1210   switch (setting->type)
1211     {
1212     case XSETTINGS_TYPE_INT:
1213       if (check_transform (xsettings_name, G_TYPE_INT, G_VALUE_TYPE (value)))
1214         {
1215           g_value_init (&tmp_val, G_TYPE_INT);
1216           g_value_set_int (&tmp_val, setting->data.v_int);
1217           g_value_transform (&tmp_val, value);
1218
1219           success = TRUE;
1220         }
1221       break;
1222     case XSETTINGS_TYPE_STRING:
1223       if (check_transform (xsettings_name, G_TYPE_STRING, G_VALUE_TYPE (value)))
1224         {
1225           g_value_init (&tmp_val, G_TYPE_STRING);
1226           g_value_set_string (&tmp_val, setting->data.v_string);
1227           g_value_transform (&tmp_val, value);
1228
1229           success = TRUE;
1230         }
1231       break;
1232     case XSETTINGS_TYPE_COLOR:
1233       if (!check_transform (xsettings_name, GDK_TYPE_RGBA, G_VALUE_TYPE (value)))
1234         {
1235           GdkRGBA rgba;
1236
1237           g_value_init (&tmp_val, GDK_TYPE_RGBA);
1238
1239           rgba.red = setting->data.v_color.red / 65535.0;
1240           rgba.green = setting->data.v_color.green / 65535.0;
1241           rgba.blue = setting->data.v_color.blue / 65535.0;
1242           rgba.alpha = setting->data.v_color.alpha / 65535.0;
1243
1244           g_value_set_boxed (&tmp_val, &rgba);
1245
1246           g_value_transform (&tmp_val, value);
1247
1248           success = TRUE;
1249         }
1250       break;
1251     }
1252
1253   g_value_unset (&tmp_val);
1254
1255  out:
1256   if (setting)
1257     xsettings_setting_free (setting);
1258
1259   if (success)
1260     return TRUE;
1261   else
1262     return _gdk_x11_get_xft_setting (screen, name, value);
1263 }
1264
1265 static void
1266 cleanup_atoms(gpointer data)
1267 {
1268   NetWmSupportedAtoms *supported_atoms = data;
1269   if (supported_atoms->atoms)
1270       XFree (supported_atoms->atoms);
1271   g_free (supported_atoms);
1272 }
1273
1274 static Window
1275 get_net_supporting_wm_check (GdkX11Screen *screen,
1276                              Window        window)
1277 {
1278   GdkDisplay *display;
1279   Atom type;
1280   gint format;
1281   gulong n_items;
1282   gulong bytes_after;
1283   guchar *data;
1284   Window value;
1285
1286   display = screen->display;
1287   type = None;
1288   data = NULL;
1289   value = None;
1290
1291   gdk_x11_display_error_trap_push (display);
1292   XGetWindowProperty (screen->xdisplay, window,
1293                       gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTING_WM_CHECK"),
1294                       0, G_MAXLONG, False, XA_WINDOW, &type, &format,
1295                       &n_items, &bytes_after, &data);
1296   gdk_x11_display_error_trap_pop_ignored (display);
1297
1298   if (type == XA_WINDOW)
1299     value = *(Window *)data;
1300
1301   if (data)
1302     XFree (data);
1303
1304   return value;
1305 }
1306
1307 static void
1308 fetch_net_wm_check_window (GdkScreen *screen)
1309 {
1310   GdkX11Screen *x11_screen;
1311   GdkDisplay *display;
1312   Window window;
1313   GTimeVal tv;
1314   gint error;
1315
1316   x11_screen = GDK_X11_SCREEN (screen);
1317   display = x11_screen->display;
1318
1319   g_return_if_fail (GDK_X11_DISPLAY (display)->trusted_client);
1320
1321   if (x11_screen->wmspec_check_window != None)
1322     return; /* already have it */
1323
1324   g_get_current_time (&tv);
1325
1326   if (ABS  (tv.tv_sec - x11_screen->last_wmspec_check_time) < 15)
1327     return; /* we've checked recently */
1328
1329   window = get_net_supporting_wm_check (x11_screen, x11_screen->xroot_window);
1330   if (window == None)
1331     return;
1332
1333   if (window != get_net_supporting_wm_check (x11_screen, window))
1334     return;
1335
1336   gdk_x11_display_error_trap_push (display);
1337
1338   /* Find out if this WM goes away, so we can reset everything. */
1339   XSelectInput (x11_screen->xdisplay, window, StructureNotifyMask);
1340
1341   error = gdk_x11_display_error_trap_pop (display);
1342   if (!error)
1343     {
1344       /* We check the window property again because after XGetWindowProperty()
1345        * and before XSelectInput() the window may have been recycled in such a
1346        * way that XSelectInput() doesn't fail but the window is no longer what
1347        * we want.
1348        */
1349       if (window != get_net_supporting_wm_check (x11_screen, window))
1350         return;
1351
1352       x11_screen->wmspec_check_window = window;
1353       x11_screen->last_wmspec_check_time = tv.tv_sec;
1354       x11_screen->need_refetch_net_supported = TRUE;
1355       x11_screen->need_refetch_wm_name = TRUE;
1356
1357       /* Careful, reentrancy */
1358       _gdk_x11_screen_window_manager_changed (screen);
1359     }
1360 }
1361
1362 /**
1363  * gdk_x11_screen_supports_net_wm_hint:
1364  * @screen: (type GdkX11Screen): the relevant #GdkScreen.
1365  * @property: a property atom.
1366  *
1367  * This function is specific to the X11 backend of GDK, and indicates
1368  * whether the window manager supports a certain hint from the
1369  * Extended Window Manager Hints Specification. You can find this
1370  * specification on
1371  * <ulink url="http://www.freedesktop.org">http://www.freedesktop.org</ulink>.
1372  *
1373  * When using this function, keep in mind that the window manager
1374  * can change over time; so you shouldn't use this function in
1375  * a way that impacts persistent application state. A common bug
1376  * is that your application can start up before the window manager
1377  * does when the user logs in, and before the window manager starts
1378  * gdk_x11_screen_supports_net_wm_hint() will return %FALSE for every property.
1379  * You can monitor the window_manager_changed signal on #GdkScreen to detect
1380  * a window manager change.
1381  *
1382  * Return value: %TRUE if the window manager supports @property
1383  *
1384  * Since: 2.2
1385  **/
1386 gboolean
1387 gdk_x11_screen_supports_net_wm_hint (GdkScreen *screen,
1388                                      GdkAtom    property)
1389 {
1390   gulong i;
1391   GdkX11Screen *x11_screen;
1392   NetWmSupportedAtoms *supported_atoms;
1393   GdkDisplay *display;
1394
1395   g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
1396
1397   x11_screen = GDK_X11_SCREEN (screen);
1398   display = x11_screen->display;
1399
1400   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1401     return FALSE;
1402
1403   supported_atoms = g_object_get_data (G_OBJECT (screen), "gdk-net-wm-supported-atoms");
1404   if (!supported_atoms)
1405     {
1406       supported_atoms = g_new0 (NetWmSupportedAtoms, 1);
1407       g_object_set_data_full (G_OBJECT (screen), "gdk-net-wm-supported-atoms", supported_atoms, cleanup_atoms);
1408     }
1409
1410   fetch_net_wm_check_window (screen);
1411
1412   if (x11_screen->wmspec_check_window == None)
1413     return FALSE;
1414
1415   if (x11_screen->need_refetch_net_supported)
1416     {
1417       /* WM has changed since we last got the supported list,
1418        * refetch it.
1419        */
1420       Atom type;
1421       gint format;
1422       gulong bytes_after;
1423
1424       x11_screen->need_refetch_net_supported = FALSE;
1425
1426       if (supported_atoms->atoms)
1427         XFree (supported_atoms->atoms);
1428
1429       supported_atoms->atoms = NULL;
1430       supported_atoms->n_atoms = 0;
1431
1432       XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), x11_screen->xroot_window,
1433                           gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTED"),
1434                           0, G_MAXLONG, False, XA_ATOM, &type, &format,
1435                           &supported_atoms->n_atoms, &bytes_after,
1436                           (guchar **)&supported_atoms->atoms);
1437
1438       if (type != XA_ATOM)
1439         return FALSE;
1440     }
1441
1442   if (supported_atoms->atoms == NULL)
1443     return FALSE;
1444
1445   i = 0;
1446   while (i < supported_atoms->n_atoms)
1447     {
1448       if (supported_atoms->atoms[i] == gdk_x11_atom_to_xatom_for_display (display, property))
1449         return TRUE;
1450
1451       ++i;
1452     }
1453
1454   return FALSE;
1455 }
1456
1457 static void
1458 refcounted_grab_server (Display *xdisplay)
1459 {
1460   GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);
1461
1462   gdk_x11_display_grab (display);
1463 }
1464
1465 static void
1466 refcounted_ungrab_server (Display *xdisplay)
1467 {
1468   GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);
1469
1470   gdk_x11_display_ungrab (display);
1471 }
1472
1473 static GdkFilterReturn
1474 gdk_xsettings_client_event_filter (GdkXEvent *xevent,
1475                                    GdkEvent  *event,
1476                                    gpointer   data)
1477 {
1478   GdkX11Screen *screen = data;
1479
1480   if (xsettings_client_process_event (screen->xsettings_client, (XEvent *)xevent))
1481     return GDK_FILTER_REMOVE;
1482   else
1483     return GDK_FILTER_CONTINUE;
1484 }
1485
1486 static Bool
1487 gdk_xsettings_watch_cb (Window   window,
1488                         Bool     is_start,
1489                         long     mask,
1490                         void    *cb_data)
1491 {
1492   GdkWindow *gdkwin;
1493   GdkScreen *screen = cb_data;
1494
1495   gdkwin = gdk_x11_window_lookup_for_display (gdk_screen_get_display (screen), window);
1496
1497   if (is_start)
1498     {
1499       if (gdkwin)
1500         g_object_ref (gdkwin);
1501       else
1502         {
1503           gdkwin = gdk_x11_window_foreign_new_for_display (gdk_screen_get_display (screen), window);
1504
1505           /* gdk_window_foreign_new_for_display() can fail and return NULL if the
1506            * window has already been destroyed.
1507            */
1508           if (!gdkwin)
1509             return False;
1510         }
1511
1512       gdk_window_add_filter (gdkwin, gdk_xsettings_client_event_filter, screen);
1513     }
1514   else
1515     {
1516       if (!gdkwin)
1517         {
1518           /* gdkwin should not be NULL here, since if starting the watch succeeded
1519            * we have a reference on the window. It might mean that the caller didn't
1520            * remove the watch when it got a DestroyNotify event. Or maybe the
1521            * caller ignored the return value when starting the watch failed.
1522            */
1523           g_warning ("gdk_xsettings_watch_cb(): Couldn't find window to unwatch");
1524           return False;
1525         }
1526
1527       gdk_window_remove_filter (gdkwin, gdk_xsettings_client_event_filter, screen);
1528       g_object_unref (gdkwin);
1529     }
1530
1531   return True;
1532 }
1533
1534 static void
1535 gdk_xsettings_notify_cb (const char       *name,
1536                          XSettingsAction   action,
1537                          XSettingsSetting *setting,
1538                          void             *data)
1539 {
1540   GdkEvent new_event;
1541   GdkScreen *screen = data;
1542   GdkX11Screen *x11_screen = data;
1543   int i;
1544
1545   if (x11_screen->xsettings_in_init)
1546     return;
1547
1548   new_event.type = GDK_SETTING;
1549   new_event.setting.window = gdk_screen_get_root_window (screen);
1550   new_event.setting.send_event = FALSE;
1551   new_event.setting.name = NULL;
1552
1553   for (i = 0; i < GDK_SETTINGS_N_ELEMENTS() ; i++)
1554     if (strcmp (GDK_SETTINGS_X_NAME (i), name) == 0)
1555       {
1556         new_event.setting.name = (char*) GDK_SETTINGS_GDK_NAME (i);
1557         break;
1558       }
1559
1560   if (!new_event.setting.name)
1561     return;
1562
1563   switch (action)
1564     {
1565     case XSETTINGS_ACTION_NEW:
1566       new_event.setting.action = GDK_SETTING_ACTION_NEW;
1567       break;
1568     case XSETTINGS_ACTION_CHANGED:
1569       new_event.setting.action = GDK_SETTING_ACTION_CHANGED;
1570       break;
1571     case XSETTINGS_ACTION_DELETED:
1572       new_event.setting.action = GDK_SETTING_ACTION_DELETED;
1573       break;
1574     }
1575
1576   gdk_event_put (&new_event);
1577 }
1578
1579 void
1580 _gdk_x11_screen_init_events (GdkScreen *screen)
1581 {
1582   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1583
1584   /* Keep a flag to avoid extra notifies that we don't need
1585    */
1586   x11_screen->xsettings_in_init = TRUE;
1587   x11_screen->xsettings_client = xsettings_client_new_with_grab_funcs (x11_screen->xdisplay,
1588                                                                        x11_screen->screen_num,
1589                                                                        gdk_xsettings_notify_cb,
1590                                                                        gdk_xsettings_watch_cb,
1591                                                                        screen,
1592                                                                        refcounted_grab_server,
1593                                                                        refcounted_ungrab_server);
1594   x11_screen->xsettings_in_init = FALSE;
1595 }
1596
1597 /**
1598  * gdk_x11_screen_get_window_manager_name:
1599  * @screen: (type GdkX11Screen): a #GdkScreen
1600  *
1601  * Returns the name of the window manager for @screen.
1602  *
1603  * Return value: the name of the window manager screen @screen, or
1604  * "unknown" if the window manager is unknown. The string is owned by GDK
1605  * and should not be freed.
1606  *
1607  * Since: 2.2
1608  **/
1609 const char*
1610 gdk_x11_screen_get_window_manager_name (GdkScreen *screen)
1611 {
1612   GdkX11Screen *x11_screen;
1613   GdkDisplay *display;
1614
1615   x11_screen = GDK_X11_SCREEN (screen);
1616   display = x11_screen->display;
1617
1618   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1619     return x11_screen->window_manager_name;
1620
1621   fetch_net_wm_check_window (screen);
1622
1623   if (x11_screen->need_refetch_wm_name)
1624     {
1625       /* Get the name of the window manager */
1626       x11_screen->need_refetch_wm_name = FALSE;
1627
1628       g_free (x11_screen->window_manager_name);
1629       x11_screen->window_manager_name = g_strdup ("unknown");
1630
1631       if (x11_screen->wmspec_check_window != None)
1632         {
1633           Atom type;
1634           gint format;
1635           gulong n_items;
1636           gulong bytes_after;
1637           gchar *name;
1638
1639           name = NULL;
1640
1641           gdk_x11_display_error_trap_push (display);
1642
1643           XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
1644                               x11_screen->wmspec_check_window,
1645                               gdk_x11_get_xatom_by_name_for_display (display,
1646                                                                      "_NET_WM_NAME"),
1647                               0, G_MAXLONG, False,
1648                               gdk_x11_get_xatom_by_name_for_display (display,
1649                                                                      "UTF8_STRING"),
1650                               &type, &format,
1651                               &n_items, &bytes_after,
1652                               (guchar **)&name);
1653
1654           gdk_x11_display_error_trap_pop_ignored (display);
1655
1656           if (name != NULL)
1657             {
1658               g_free (x11_screen->window_manager_name);
1659               x11_screen->window_manager_name = g_strdup (name);
1660               XFree (name);
1661             }
1662         }
1663     }
1664
1665   return GDK_X11_SCREEN (screen)->window_manager_name;
1666 }
1667
1668 static void
1669 gdk_x11_screen_class_init (GdkX11ScreenClass *klass)
1670 {
1671   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1672   GdkScreenClass *screen_class = GDK_SCREEN_CLASS (klass);
1673
1674   object_class->dispose = gdk_x11_screen_dispose;
1675   object_class->finalize = gdk_x11_screen_finalize;
1676
1677   screen_class->get_display = gdk_x11_screen_get_display;
1678   screen_class->get_width = gdk_x11_screen_get_width;
1679   screen_class->get_height = gdk_x11_screen_get_height;
1680   screen_class->get_width_mm = gdk_x11_screen_get_width_mm;
1681   screen_class->get_height_mm = gdk_x11_screen_get_height_mm;
1682   screen_class->get_number = gdk_x11_screen_get_number;
1683   screen_class->get_root_window = gdk_x11_screen_get_root_window;
1684   screen_class->get_n_monitors = gdk_x11_screen_get_n_monitors;
1685   screen_class->get_primary_monitor = gdk_x11_screen_get_primary_monitor;
1686   screen_class->get_monitor_width_mm = gdk_x11_screen_get_monitor_width_mm;
1687   screen_class->get_monitor_height_mm = gdk_x11_screen_get_monitor_height_mm;
1688   screen_class->get_monitor_plug_name = gdk_x11_screen_get_monitor_plug_name;
1689   screen_class->get_monitor_geometry = gdk_x11_screen_get_monitor_geometry;
1690   screen_class->get_monitor_workarea = gdk_x11_screen_get_monitor_workarea;
1691   screen_class->get_system_visual = _gdk_x11_screen_get_system_visual;
1692   screen_class->get_rgba_visual = gdk_x11_screen_get_rgba_visual;
1693   screen_class->is_composited = gdk_x11_screen_is_composited;
1694   screen_class->make_display_name = gdk_x11_screen_make_display_name;
1695   screen_class->get_active_window = gdk_x11_screen_get_active_window;
1696   screen_class->get_window_stack = gdk_x11_screen_get_window_stack;
1697   screen_class->get_setting = gdk_x11_screen_get_setting;
1698   screen_class->visual_get_best_depth = _gdk_x11_screen_visual_get_best_depth;
1699   screen_class->visual_get_best_type = _gdk_x11_screen_visual_get_best_type;
1700   screen_class->visual_get_best = _gdk_x11_screen_visual_get_best;
1701   screen_class->visual_get_best_with_depth = _gdk_x11_screen_visual_get_best_with_depth;
1702   screen_class->visual_get_best_with_type = _gdk_x11_screen_visual_get_best_with_type;
1703   screen_class->visual_get_best_with_both = _gdk_x11_screen_visual_get_best_with_both;
1704   screen_class->query_depths = _gdk_x11_screen_query_depths;
1705   screen_class->query_visual_types = _gdk_x11_screen_query_visual_types;
1706   screen_class->list_visuals = _gdk_x11_screen_list_visuals;
1707
1708   signals[WINDOW_MANAGER_CHANGED] =
1709     g_signal_new (g_intern_static_string ("window-manager-changed"),
1710                   G_OBJECT_CLASS_TYPE (object_class),
1711                   G_SIGNAL_RUN_LAST,
1712                   G_STRUCT_OFFSET (GdkX11ScreenClass, window_manager_changed),
1713                   NULL, NULL,
1714                   g_cclosure_marshal_VOID__VOID,
1715                   G_TYPE_NONE,
1716                   0);
1717 }