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