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, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  */
  23
  24 #include "config.h"
  25
  26 #include "gdkscreen-x11.h"
  27 #include "gdkdisplay-x11.h"
  28 #include "gdkprivate-x11.h"
  29
  30 #include <glib.h>
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include <X11/Xatom.h>
  36
  37 #ifdef HAVE_SOLARIS_XINERAMA
  38 #include <X11/extensions/xinerama.h>
  39 #endif
  40 #ifdef HAVE_XFREE_XINERAMA
  41 #include <X11/extensions/Xinerama.h>
  42 #endif
  43
  44 #ifdef HAVE_RANDR
  45 #include <X11/extensions/Xrandr.h>
  46 #endif
  47
  48 #ifdef HAVE_XFIXES
  49 #include <X11/extensions/Xfixes.h>
  50 #endif
  51
  52 #include "gdksettings.c"
  53
  54 static void         gdk_x11_screen_dispose     (GObject           *object);
  55 static void         gdk_x11_screen_finalize    (GObject           *object);
  56 static void         init_randr_support         (GdkScreen         *screen);
  57 static void         deinit_multihead           (GdkScreen         *screen);
  58
  59 enum
  60 {
  61   WINDOW_MANAGER_CHANGED,
  62   LAST_SIGNAL
  63 };
  64
  65 static guint signals[LAST_SIGNAL] = { 0 };
  66
  67 G_DEFINE_TYPE (GdkX11Screen, gdk_x11_screen, GDK_TYPE_SCREEN)
  68
  69 typedef struct _NetWmSupportedAtoms NetWmSupportedAtoms;
  70
  71 struct _NetWmSupportedAtoms
  72 {
  73   Atom *atoms;
  74   gulong n_atoms;
  75 };
  76
  77 struct _GdkX11Monitor
  78 {
  79   GdkRectangle  geometry;
  80   XID           output;
  81   int           width_mm;
  82   int           height_mm;
  83   char *        output_name;
  84   char *        manufacturer;
  85 };
  86
  87
  88 static void
  89 gdk_x11_screen_init (GdkX11Screen *screen)
  90 {
  91 }
  92
  93 static GdkDisplay *
  94 gdk_x11_screen_get_display (GdkScreen *screen)
  95 {
  96   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
  97
  98   return GDK_X11_SCREEN (screen)->display;
  99 }
 100
 101 static gint
 102 gdk_x11_screen_get_width (GdkScreen *screen)
 103 {
 104   g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
 105
 106   return WidthOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 107 }
 108
 109 static gint
 110 gdk_x11_screen_get_height (GdkScreen *screen)
 111 {
 112   g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
 113
 114   return HeightOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 115 }
 116
 117 static gint
 118 gdk_x11_screen_get_width_mm (GdkScreen *screen)
 119 {
 120   g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
 121
 122   return WidthMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 123 }
 124
 125 static gint
 126 gdk_x11_screen_get_height_mm (GdkScreen *screen)
 127 {
 128   g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
 129
 130   return HeightMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
 131 }
 132
 133 static gint
 134 gdk_x11_screen_get_number (GdkScreen *screen)
 135 {
 136   g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
 137
 138   return GDK_X11_SCREEN (screen)->screen_num;
 139 }
 140
 141 static GdkWindow *
 142 gdk_x11_screen_get_root_window (GdkScreen *screen)
 143 {
 144   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
 145
 146   return GDK_X11_SCREEN (screen)->root_window;
 147 }
 148
 149 static void
 150 _gdk_x11_screen_events_uninit (GdkScreen *screen)
 151 {
 152   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 153
 154   if (x11_screen->xsettings_client)
 155     {
 156       xsettings_client_destroy (x11_screen->xsettings_client);
 157       x11_screen->xsettings_client = NULL;
 158     }
 159 }
 160
 161 static void
 162 gdk_x11_screen_dispose (GObject *object)
 163 {
 164   GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
 165   int i;
 166
 167   for (i = 0; i < 32; ++i)
 168     {
 169       if (x11_screen->subwindow_gcs[i])
 170         {
 171           XFreeGC (x11_screen->xdisplay, x11_screen->subwindow_gcs[i]);
 172           x11_screen->subwindow_gcs[i] = 0;
 173         }
 174     }
 175
 176   _gdk_x11_screen_events_uninit (GDK_SCREEN (object));
 177
 178   if (x11_screen->root_window)
 179     _gdk_window_destroy (x11_screen->root_window, TRUE);
 180
 181   G_OBJECT_CLASS (gdk_x11_screen_parent_class)->dispose (object);
 182
 183   x11_screen->xdisplay = NULL;
 184   x11_screen->xscreen = NULL;
 185   x11_screen->screen_num = -1;
 186   x11_screen->xroot_window = None;
 187   x11_screen->wmspec_check_window = None;
 188 }
 189
 190 static void
 191 gdk_x11_screen_finalize (GObject *object)
 192 {
 193   GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
 194   gint          i;
 195
 196   if (x11_screen->root_window)
 197     g_object_unref (x11_screen->root_window);
 198
 199   /* Visual Part */
 200   for (i = 0; i < x11_screen->nvisuals; i++)
 201     g_object_unref (x11_screen->visuals[i]);
 202   g_free (x11_screen->visuals);
 203   g_hash_table_destroy (x11_screen->visual_hash);
 204
 205   g_free (x11_screen->window_manager_name);
 206
 207   deinit_multihead (GDK_SCREEN (object));
 208
 209   G_OBJECT_CLASS (gdk_x11_screen_parent_class)->finalize (object);
 210 }
 211
 212 static gint
 213 gdk_x11_screen_get_n_monitors (GdkScreen *screen)
 214 {
 215   g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
 216
 217   return GDK_X11_SCREEN (screen)->n_monitors;
 218 }
 219
 220 static gint
 221 gdk_x11_screen_get_primary_monitor (GdkScreen *screen)
 222 {
 223   g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
 224
 225   return GDK_X11_SCREEN (screen)->primary_monitor;
 226 }
 227
 228 static gint
 229 gdk_x11_screen_get_monitor_width_mm     (GdkScreen *screen,
 230                                          gint       monitor_num)
 231 {
 232   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 233
 234   g_return_val_if_fail (GDK_IS_SCREEN (screen), -1);
 235   g_return_val_if_fail (monitor_num >= 0, -1);
 236   g_return_val_if_fail (monitor_num < x11_screen->n_monitors, -1);
 237
 238   return x11_screen->monitors[monitor_num].width_mm;
 239 }
 240
 241 static gint
 242 gdk_x11_screen_get_monitor_height_mm (GdkScreen *screen,
 243                                       gint       monitor_num)
 244 {
 245   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 246
 247   g_return_val_if_fail (GDK_IS_SCREEN (screen), -1);
 248   g_return_val_if_fail (monitor_num >= 0, -1);
 249   g_return_val_if_fail (monitor_num < x11_screen->n_monitors, -1);
 250
 251   return x11_screen->monitors[monitor_num].height_mm;
 252 }
 253
 254 static gchar *
 255 gdk_x11_screen_get_monitor_plug_name (GdkScreen *screen,
 256                                       gint       monitor_num)
 257 {
 258   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 259
 260   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
 261   g_return_val_if_fail (monitor_num >= 0, NULL);
 262   g_return_val_if_fail (monitor_num < x11_screen->n_monitors, NULL);
 263
 264   return g_strdup (x11_screen->monitors[monitor_num].output_name);
 265 }
 266
 267 /**
 268  * gdk_x11_screen_get_monitor_output: (skip)
 269  * @screen: a #GdkScreen
 270  * @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen)
 271  *
 272  * Gets the XID of the specified output/monitor.
 273  * If the X server does not support version 1.2 of the RANDR
 274  * extension, 0 is returned.
 275  *
 276  * Returns: the XID of the monitor
 277  *
 278  * Since: 2.14
 279  */
 280 XID
 281 gdk_x11_screen_get_monitor_output (GdkScreen *screen,
 282                                    gint       monitor_num)
 283 {
 284   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 285
 286   g_return_val_if_fail (GDK_IS_SCREEN (screen), None);
 287   g_return_val_if_fail (monitor_num >= 0, None);
 288   g_return_val_if_fail (monitor_num < x11_screen->n_monitors, None);
 289
 290   return x11_screen->monitors[monitor_num].output;
 291 }
 292
 293 static void
 294 gdk_x11_screen_get_monitor_geometry (GdkScreen    *screen,
 295                                      gint          monitor_num,
 296                                      GdkRectangle *dest)
 297 {
 298   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 299
 300   g_return_if_fail (GDK_IS_SCREEN (screen));
 301   g_return_if_fail (monitor_num >= 0);
 302   g_return_if_fail (monitor_num < x11_screen->n_monitors);
 303
 304   if (dest)
 305     *dest = x11_screen->monitors[monitor_num].geometry;
 306 }
 307
 308 static GdkVisual *
 309 gdk_x11_screen_get_rgba_visual (GdkScreen *screen)
 310 {
 311   GdkX11Screen *x11_screen;
 312
 313   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
 314
 315   x11_screen = GDK_X11_SCREEN (screen);
 316
 317   return x11_screen->rgba_visual;
 318 }
 319
 320 /**
 321  * gdk_x11_screen_get_xscreen:
 322  * @screen: a #GdkScreen.
 323  * @returns: (transfer none): an Xlib <type>Screen*</type>
 324  *
 325  * Returns the screen of a #GdkScreen.
 326  *
 327  * Since: 2.2
 328  */
 329 Screen *
 330 gdk_x11_screen_get_xscreen (GdkScreen *screen)
 331 {
 332   return GDK_X11_SCREEN (screen)->xscreen;
 333 }
 334
 335 /**
 336  * gdk_x11_screen_get_screen_number:
 337  * @screen: a #GdkScreen.
 338  * @returns: the position of @screen among the screens of
 339  *   its display.
 340  *
 341  * Returns the index of a #GdkScreen.
 342  *
 343  * Since: 2.2
 344  */
 345 int
 346 gdk_x11_screen_get_screen_number (GdkScreen *screen)
 347 {
 348   return GDK_X11_SCREEN (screen)->screen_num;
 349 }
 350
 351 static gboolean
 352 check_is_composited (GdkDisplay *display,
 353                      GdkX11Screen *x11_screen)
 354 {
 355   Atom xselection = gdk_x11_atom_to_xatom_for_display (display, x11_screen->cm_selection_atom);
 356   Window xwindow;
 357
 358   xwindow = XGetSelectionOwner (GDK_DISPLAY_XDISPLAY (display), xselection);
 359
 360   return xwindow != None;
 361 }
 362
 363 static GdkAtom
 364 make_cm_atom (int screen_number)
 365 {
 366   gchar *name = g_strdup_printf ("_NET_WM_CM_S%d", screen_number);
 367   GdkAtom atom = gdk_atom_intern (name, FALSE);
 368   g_free (name);
 369   return atom;
 370 }
 371
 372 static void
 373 init_monitor_geometry (GdkX11Monitor *monitor,
 374                        int x, int y, int width, int height)
 375 {
 376   monitor->geometry.x = x;
 377   monitor->geometry.y = y;
 378   monitor->geometry.width = width;
 379   monitor->geometry.height = height;
 380
 381   monitor->output = None;
 382   monitor->width_mm = -1;
 383   monitor->height_mm = -1;
 384   monitor->output_name = NULL;
 385   monitor->manufacturer = NULL;
 386 }
 387
 388 static gboolean
 389 init_fake_xinerama (GdkScreen *screen)
 390 {
 391 #ifdef G_ENABLE_DEBUG
 392   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 393   XSetWindowAttributes atts;
 394   Window win;
 395   gint w, h;
 396
 397   if (!(_gdk_debug_flags & GDK_DEBUG_XINERAMA))
 398     return FALSE;
 399
 400   /* Fake Xinerama mode by splitting the screen into 4 monitors.
 401    * Also draw a little cross to make the monitor boundaries visible.
 402    */
 403   w = WidthOfScreen (x11_screen->xscreen);
 404   h = HeightOfScreen (x11_screen->xscreen);
 405
 406   x11_screen->n_monitors = 4;
 407   x11_screen->monitors = g_new0 (GdkX11Monitor, 4);
 408   init_monitor_geometry (&x11_screen->monitors[0], 0, 0, w / 2, h / 2);
 409   init_monitor_geometry (&x11_screen->monitors[1], w / 2, 0, w / 2, h / 2);
 410   init_monitor_geometry (&x11_screen->monitors[2], 0, h / 2, w / 2, h / 2);
 411   init_monitor_geometry (&x11_screen->monitors[3], w / 2, h / 2, w / 2, h / 2);
 412
 413   atts.override_redirect = 1;
 414   atts.background_pixel = WhitePixel(GDK_SCREEN_XDISPLAY (screen),
 415                                      x11_screen->screen_num);
 416   win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
 417                       x11_screen->xroot_window, 0, h / 2, w, 1, 0,
 418                       DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
 419                                    x11_screen->screen_num),
 420                       InputOutput,
 421                       DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
 422                                     x11_screen->screen_num),
 423                       CWOverrideRedirect|CWBackPixel,
 424                       &atts);
 425   XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
 426   win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
 427                       x11_screen->xroot_window, w/2 , 0, 1, h, 0,
 428                       DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
 429                                    x11_screen->screen_num),
 430                       InputOutput,
 431                       DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
 432                                     x11_screen->screen_num),
 433                       CWOverrideRedirect|CWBackPixel,
 434                       &atts);
 435   XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
 436   return TRUE;
 437 #endif
 438
 439   return FALSE;
 440 }
 441
 442 static void
 443 free_monitors (GdkX11Monitor *monitors,
 444                gint           n_monitors)
 445 {
 446   int i;
 447
 448   for (i = 0; i < n_monitors; ++i)
 449     {
 450       g_free (monitors[i].output_name);
 451       g_free (monitors[i].manufacturer);
 452     }
 453
 454   g_free (monitors);
 455 }
 456
 457 #ifdef HAVE_RANDR
 458 static int
 459 monitor_compare_function (GdkX11Monitor *monitor1,
 460                           GdkX11Monitor *monitor2)
 461 {
 462   /* Sort the leftmost/topmost monitors first.
 463    * For "cloned" monitors, sort the bigger ones first
 464    * (giving preference to taller monitors over wider
 465    * monitors)
 466    */
 467
 468   if (monitor1->geometry.x != monitor2->geometry.x)
 469     return monitor1->geometry.x - monitor2->geometry.x;
 470
 471   if (monitor1->geometry.y != monitor2->geometry.y)
 472     return monitor1->geometry.y - monitor2->geometry.y;
 473
 474   if (monitor1->geometry.height != monitor2->geometry.height)
 475     return - (monitor1->geometry.height - monitor2->geometry.height);
 476
 477   if (monitor1->geometry.width != monitor2->geometry.width)
 478     return - (monitor1->geometry.width - monitor2->geometry.width);
 479
 480   return 0;
 481 }
 482 #endif
 483
 484 static gboolean
 485 init_randr13 (GdkScreen *screen)
 486 {
 487 #ifdef HAVE_RANDR
 488   GdkDisplay *display = gdk_screen_get_display (screen);
 489   GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
 490   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 491   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 492   XRRScreenResources *resources;
 493   RROutput primary_output;
 494   RROutput first_output = None;
 495   int i;
 496   GArray *monitors;
 497   gboolean randr12_compat = FALSE;
 498
 499   if (!display_x11->have_randr13)
 500       return FALSE;
 501
 502   resources = XRRGetScreenResourcesCurrent (x11_screen->xdisplay,
 503                                             x11_screen->xroot_window);
 504   if (!resources)
 505     return FALSE;
 506
 507   monitors = g_array_sized_new (FALSE, TRUE, sizeof (GdkX11Monitor),
 508                                 resources->noutput);
 509
 510   for (i = 0; i < resources->noutput; ++i)
 511     {
 512       XRROutputInfo *output =
 513         XRRGetOutputInfo (dpy, resources, resources->outputs[i]);
 514
 515       /* Non RandR1.2 X driver have output name "default" */
 516       randr12_compat |= !g_strcmp0 (output->name, "default");
 517
 518       if (output->connection == RR_Disconnected)
 519         {
 520           XRRFreeOutputInfo (output);
 521           continue;
 522         }
 523
 524       if (output->crtc)
 525         {
 526           GdkX11Monitor monitor;
 527           XRRCrtcInfo *crtc = XRRGetCrtcInfo (dpy, resources, output->crtc);
 528
 529           monitor.geometry.x = crtc->x;
 530           monitor.geometry.y = crtc->y;
 531           monitor.geometry.width = crtc->width;
 532           monitor.geometry.height = crtc->height;
 533
 534           monitor.output = resources->outputs[i];
 535           monitor.width_mm = output->mm_width;
 536           monitor.height_mm = output->mm_height;
 537           monitor.output_name = g_strdup (output->name);
 538           /* FIXME: need EDID parser */
 539           monitor.manufacturer = NULL;
 540
 541           g_array_append_val (monitors, monitor);
 542
 543           XRRFreeCrtcInfo (crtc);
 544         }
 545
 546       XRRFreeOutputInfo (output);
 547     }
 548
 549   if (resources->noutput > 0)
 550     first_output = resources->outputs[0];
 551
 552   XRRFreeScreenResources (resources);
 553
 554   /* non RandR 1.2 X driver doesn't return any usable multihead data */
 555   if (randr12_compat)
 556     {
 557       guint n_monitors = monitors->len;
 558
 559       free_monitors ((GdkX11Monitor *)g_array_free (monitors, FALSE),
 560                      n_monitors);
 561
 562       return FALSE;
 563     }
 564
 565   g_array_sort (monitors,
 566                 (GCompareFunc) monitor_compare_function);
 567   x11_screen->n_monitors = monitors->len;
 568   x11_screen->monitors = (GdkX11Monitor *)g_array_free (monitors, FALSE);
 569
 570   x11_screen->primary_monitor = 0;
 571
 572   primary_output = XRRGetOutputPrimary (x11_screen->xdisplay,
 573                                         x11_screen->xroot_window);
 574
 575   for (i = 0; i < x11_screen->n_monitors; ++i)
 576     {
 577       if (x11_screen->monitors[i].output == primary_output)
 578         {
 579           x11_screen->primary_monitor = i;
 580           break;
 581         }
 582
 583       /* No RandR1.3+ available or no primary set, fall back to prefer LVDS as primary if present */
 584       if (primary_output == None &&
 585           g_ascii_strncasecmp (x11_screen->monitors[i].output_name, "LVDS", 4) == 0)
 586         {
 587           x11_screen->primary_monitor = i;
 588           break;
 589         }
 590
 591       /* No primary specified and no LVDS found */
 592       if (x11_screen->monitors[i].output == first_output)
 593         x11_screen->primary_monitor = i;
 594     }
 595
 596   return x11_screen->n_monitors > 0;
 597 #endif
 598
 599   return FALSE;
 600 }
 601
 602 static gboolean
 603 init_solaris_xinerama (GdkScreen *screen)
 604 {
 605 #ifdef HAVE_SOLARIS_XINERAMA
 606   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 607   int screen_no = gdk_screen_get_number (screen);
 608   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 609   XRectangle monitors[MAXFRAMEBUFFERS];
 610   unsigned char hints[16];
 611   gint result;
 612   int n_monitors;
 613   int i;
 614
 615   if (!XineramaGetState (dpy, screen_no))
 616     return FALSE;
 617
 618   result = XineramaGetInfo (dpy, screen_no, monitors, hints, &n_monitors);
 619
 620   /* Yes I know it should be Success but the current implementation
 621    * returns the num of monitor
 622    */
 623   if (result == 0)
 624     {
 625       return FALSE;
 626     }
 627
 628   x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
 629   x11_screen->n_monitors = n_monitors;
 630
 631   for (i = 0; i < n_monitors; i++)
 632     {
 633       init_monitor_geometry (&x11_screen->monitors[i],
 634                              monitors[i].x, monitors[i].y,
 635                              monitors[i].width, monitors[i].height);
 636     }
 637
 638   x11_screen->primary_monitor = 0;
 639
 640   return TRUE;
 641 #endif /* HAVE_SOLARIS_XINERAMA */
 642
 643   return FALSE;
 644 }
 645
 646 static gboolean
 647 init_xfree_xinerama (GdkScreen *screen)
 648 {
 649 #ifdef HAVE_XFREE_XINERAMA
 650   Display *dpy = GDK_SCREEN_XDISPLAY (screen);
 651   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 652   XineramaScreenInfo *monitors;
 653   int i, n_monitors;
 654
 655   if (!XineramaIsActive (dpy))
 656     return FALSE;
 657
 658   monitors = XineramaQueryScreens (dpy, &n_monitors);
 659
 660   if (n_monitors <= 0 || monitors == NULL)
 661     {
 662       /* If Xinerama doesn't think we have any monitors, try acting as
 663        * though we had no Xinerama. If the "no monitors" condition
 664        * is because XRandR 1.2 is currently switching between CRTCs,
 665        * we'll be notified again when we have our monitor back,
 666        * and can go back into Xinerama-ish mode at that point.
 667        */
 668       if (monitors)
 669         XFree (monitors);
 670
 671       return FALSE;
 672     }
 673
 674   x11_screen->n_monitors = n_monitors;
 675   x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
 676
 677   for (i = 0; i < n_monitors; ++i)
 678     {
 679       init_monitor_geometry (&x11_screen->monitors[i],
 680                              monitors[i].x_org, monitors[i].y_org,
 681                              monitors[i].width, monitors[i].height);
 682     }
 683
 684   XFree (monitors);
 685
 686   x11_screen->primary_monitor = 0;
 687
 688   return TRUE;
 689 #endif /* HAVE_XFREE_XINERAMA */
 690
 691   return FALSE;
 692 }
 693
 694 static void
 695 deinit_multihead (GdkScreen *screen)
 696 {
 697   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 698
 699   free_monitors (x11_screen->monitors, x11_screen->n_monitors);
 700
 701   x11_screen->n_monitors = 0;
 702   x11_screen->monitors = NULL;
 703 }
 704
 705 static gboolean
 706 compare_monitor (GdkX11Monitor *m1,
 707                  GdkX11Monitor *m2)
 708 {
 709   if (m1->geometry.x != m2->geometry.x ||
 710       m1->geometry.y != m2->geometry.y ||
 711       m1->geometry.width != m2->geometry.width ||
 712       m1->geometry.height != m2->geometry.height)
 713     return FALSE;
 714
 715   if (m1->width_mm != m2->width_mm ||
 716       m1->height_mm != m2->height_mm)
 717     return FALSE;
 718
 719   if (g_strcmp0 (m1->output_name, m2->output_name) != 0)
 720     return FALSE;
 721
 722   if (g_strcmp0 (m1->manufacturer, m2->manufacturer) != 0)
 723     return FALSE;
 724
 725   return TRUE;
 726 }
 727
 728 static gboolean
 729 compare_monitors (GdkX11Monitor *monitors1, gint n_monitors1,
 730                   GdkX11Monitor *monitors2, gint n_monitors2)
 731 {
 732   gint i;
 733
 734   if (n_monitors1 != n_monitors2)
 735     return FALSE;
 736
 737   for (i = 0; i < n_monitors1; i++)
 738     {
 739       if (!compare_monitor (monitors1 + i, monitors2 + i))
 740         return FALSE;
 741     }
 742
 743   return TRUE;
 744 }
 745
 746 static void
 747 init_multihead (GdkScreen *screen)
 748 {
 749   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 750   int opcode, firstevent, firsterror;
 751
 752   /* There are four different implementations of multihead support:
 753    *
 754    *  1. Fake Xinerama for debugging purposes
 755    *  2. RandR 1.2
 756    *  3. Solaris Xinerama
 757    *  4. XFree86/Xorg Xinerama
 758    *
 759    * We use them in that order.
 760    */
 761   if (init_fake_xinerama (screen))
 762     return;
 763
 764   if (init_randr13 (screen))
 765     return;
 766
 767   if (XQueryExtension (GDK_SCREEN_XDISPLAY (screen), "XINERAMA",
 768                        &opcode, &firstevent, &firsterror))
 769     {
 770       if (init_solaris_xinerama (screen))
 771         return;
 772
 773       if (init_xfree_xinerama (screen))
 774         return;
 775     }
 776
 777   /* No multihead support of any kind for this screen */
 778   x11_screen->n_monitors = 1;
 779   x11_screen->monitors = g_new0 (GdkX11Monitor, 1);
 780   x11_screen->primary_monitor = 0;
 781
 782   init_monitor_geometry (x11_screen->monitors, 0, 0,
 783                          WidthOfScreen (x11_screen->xscreen),
 784                          HeightOfScreen (x11_screen->xscreen));
 785 }
 786
 787 GdkScreen *
 788 _gdk_x11_screen_new (GdkDisplay *display,
 789                      gint        screen_number)
 790 {
 791   GdkScreen *screen;
 792   GdkX11Screen *x11_screen;
 793   GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
 794
 795   screen = g_object_new (GDK_TYPE_X11_SCREEN, NULL);
 796
 797   x11_screen = GDK_X11_SCREEN (screen);
 798   x11_screen->display = display;
 799   x11_screen->xdisplay = display_x11->xdisplay;
 800   x11_screen->xscreen = ScreenOfDisplay (display_x11->xdisplay, screen_number);
 801   x11_screen->screen_num = screen_number;
 802   x11_screen->xroot_window = RootWindow (display_x11->xdisplay,screen_number);
 803   x11_screen->wmspec_check_window = None;
 804   /* we want this to be always non-null */
 805   x11_screen->window_manager_name = g_strdup ("unknown");
 806
 807   init_multihead (screen);
 808   init_randr_support (screen);
 809
 810   _gdk_x11_screen_init_visuals (screen);
 811   _gdk_x11_screen_init_root_window (screen);
 812
 813   return screen;
 814 }
 815
 816 /*
 817  * It is important that we first request the selection
 818  * notification, and then setup the initial state of
 819  * is_composited to avoid a race condition here.
 820  */
 821 void
 822 _gdk_x11_screen_setup (GdkScreen *screen)
 823 {
 824   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 825
 826   x11_screen->cm_selection_atom = make_cm_atom (x11_screen->screen_num);
 827   gdk_display_request_selection_notification (x11_screen->display,
 828                                               x11_screen->cm_selection_atom);
 829   x11_screen->is_composited = check_is_composited (x11_screen->display, x11_screen);
 830 }
 831
 832 static gboolean
 833 gdk_x11_screen_is_composited (GdkScreen *screen)
 834 {
 835   GdkX11Screen *x11_screen;
 836
 837   g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
 838
 839   x11_screen = GDK_X11_SCREEN (screen);
 840
 841   return x11_screen->is_composited;
 842 }
 843
 844 static void
 845 init_randr_support (GdkScreen *screen)
 846 {
 847   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 848
 849   XSelectInput (GDK_SCREEN_XDISPLAY (screen),
 850                 x11_screen->xroot_window,
 851                 StructureNotifyMask);
 852
 853 #ifdef HAVE_RANDR
 854   if (!GDK_X11_DISPLAY (gdk_screen_get_display (screen))->have_randr12)
 855     return;
 856
 857   XRRSelectInput (GDK_SCREEN_XDISPLAY (screen),
 858                   x11_screen->xroot_window,
 859                   RRScreenChangeNotifyMask
 860                   | RRCrtcChangeNotifyMask
 861                   | RROutputPropertyNotifyMask);
 862 #endif
 863 }
 864
 865 static void
 866 process_monitors_change (GdkScreen *screen)
 867 {
 868   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 869   gint           n_monitors;
 870   GdkX11Monitor *monitors;
 871   gboolean changed;
 872
 873   n_monitors = x11_screen->n_monitors;
 874   monitors = x11_screen->monitors;
 875
 876   x11_screen->n_monitors = 0;
 877   x11_screen->monitors = NULL;
 878
 879   init_multihead (screen);
 880
 881   changed = !compare_monitors (monitors, n_monitors,
 882                                x11_screen->monitors, x11_screen->n_monitors);
 883
 884   free_monitors (monitors, n_monitors);
 885
 886   if (changed)
 887     g_signal_emit_by_name (screen, "monitors-changed");
 888 }
 889
 890 void
 891 _gdk_x11_screen_size_changed (GdkScreen *screen,
 892                               XEvent    *event)
 893 {
 894   gint width, height;
 895 #ifdef HAVE_RANDR
 896   GdkX11Display *display_x11;
 897 #endif
 898
 899   width = gdk_screen_get_width (screen);
 900   height = gdk_screen_get_height (screen);
 901
 902 #ifdef HAVE_RANDR
 903   display_x11 = GDK_X11_DISPLAY (gdk_screen_get_display (screen));
 904
 905   if (display_x11->have_randr13 && event->type == ConfigureNotify)
 906     {
 907       g_signal_emit_by_name (screen, "monitors-changed");
 908       return;
 909     }
 910
 911   XRRUpdateConfiguration (event);
 912 #else
 913   if (event->type == ConfigureNotify)
 914     {
 915       XConfigureEvent *rcevent = (XConfigureEvent *) event;
 916       Screen        *xscreen = gdk_x11_screen_get_xscreen (screen);
 917
 918       xscreen->width   = rcevent->width;
 919       xscreen->height  = rcevent->height;
 920     }
 921   else
 922     return;
 923 #endif
 924
 925   process_monitors_change (screen);
 926
 927   if (width != gdk_screen_get_width (screen) ||
 928       height != gdk_screen_get_height (screen))
 929     g_signal_emit_by_name (screen, "size-changed");
 930 }
 931
 932 void
 933 _gdk_x11_screen_window_manager_changed (GdkScreen *screen)
 934 {
 935   g_signal_emit (screen, signals[WINDOW_MANAGER_CHANGED], 0);
 936 }
 937
 938 void
 939 _gdk_x11_screen_process_owner_change (GdkScreen *screen,
 940                                       XEvent *event)
 941 {
 942 #ifdef HAVE_XFIXES
 943   XFixesSelectionNotifyEvent *selection_event = (XFixesSelectionNotifyEvent *)event;
 944   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 945   Atom xcm_selection_atom = gdk_x11_atom_to_xatom_for_display (x11_screen->display,
 946                                                                x11_screen->cm_selection_atom);
 947
 948   if (selection_event->selection == xcm_selection_atom)
 949     {
 950       gboolean composited = selection_event->owner != None;
 951
 952       if (composited != x11_screen->is_composited)
 953         {
 954           x11_screen->is_composited = composited;
 955
 956           g_signal_emit_by_name (screen, "composited-changed");
 957         }
 958     }
 959 #endif
 960 }
 961
 962 static gchar *
 963 substitute_screen_number (const gchar *display_name,
 964                           gint         screen_number)
 965 {
 966   GString *str;
 967   gchar   *p;
 968
 969   str = g_string_new (display_name);
 970
 971   p = strrchr (str->str, '.');
 972   if (p && p >  strchr (str->str, ':'))
 973     g_string_truncate (str, p - str->str);
 974
 975   g_string_append_printf (str, ".%d", screen_number);
 976
 977   return g_string_free (str, FALSE);
 978 }
 979
 980 static gchar *
 981 gdk_x11_screen_make_display_name (GdkScreen *screen)
 982 {
 983   const gchar *old_display;
 984
 985   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
 986
 987   old_display = gdk_display_get_name (gdk_screen_get_display (screen));
 988
 989   return substitute_screen_number (old_display,
 990                                    gdk_screen_get_number (screen));
 991 }
 992
 993 static GdkWindow *
 994 gdk_x11_screen_get_active_window (GdkScreen *screen)
 995 {
 996   GdkX11Screen *x11_screen;
 997   GdkWindow *ret = NULL;
 998   Atom type_return;
 999   gint format_return;
1000   gulong nitems_return;
1001   gulong bytes_after_return;
1002   guchar *data = NULL;
1003
1004   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
1005
1006   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1007                                             gdk_atom_intern_static_string ("_NET_ACTIVE_WINDOW")))
1008     return NULL;
1009
1010   x11_screen = GDK_X11_SCREEN (screen);
1011
1012   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1013                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1014                                                                  "_NET_ACTIVE_WINDOW"),
1015                           0, 1, False, XA_WINDOW, &type_return,
1016                           &format_return, &nitems_return,
1017                           &bytes_after_return, &data)
1018       == Success)
1019     {
1020       if ((type_return == XA_WINDOW) && (format_return == 32) && (data))
1021         {
1022           GdkNativeWindow window = *(GdkNativeWindow *) data;
1023
1024           if (window != None)
1025             {
1026               ret = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1027                                                         *(Window *) data);
1028             }
1029         }
1030     }
1031
1032   if (data)
1033     XFree (data);
1034
1035   return ret;
1036 }
1037
1038 static GList *
1039 gdk_x11_screen_get_window_stack (GdkScreen *screen)
1040 {
1041   GdkX11Screen *x11_screen;
1042   GList *ret = NULL;
1043   Atom type_return;
1044   gint format_return;
1045   gulong nitems_return;
1046   gulong bytes_after_return;
1047   guchar *data = NULL;
1048
1049   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
1050
1051   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1052                                             gdk_atom_intern_static_string ("_NET_CLIENT_LIST_STACKING")))
1053     return NULL;
1054
1055   x11_screen = GDK_X11_SCREEN (screen);
1056
1057   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1058                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1059                                                                  "_NET_CLIENT_LIST_STACKING"),
1060                           0, G_MAXLONG, False, XA_WINDOW, &type_return,
1061                           &format_return, &nitems_return,
1062                           &bytes_after_return, &data)
1063       == Success)
1064     {
1065       if ((type_return == XA_WINDOW) && (format_return == 32) &&
1066           (data) && (nitems_return > 0))
1067         {
1068           gulong *stack = (gulong *) data;
1069           GdkWindow *win;
1070           int i;
1071
1072           for (i = 0; i < nitems_return; i++)
1073             {
1074               win = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1075                                                             (Window)stack[i]);
1076
1077               if (win != NULL)
1078                 ret = g_list_append (ret, win);
1079             }
1080         }
1081     }
1082
1083   if (data)
1084     XFree (data);
1085
1086   return ret;
1087 }
1088
1089 /* Sends a ClientMessage to all toplevel client windows */
1090 static gboolean
1091 gdk_event_send_client_message_to_all_recurse (GdkDisplay *display,
1092                                               XEvent     *xev,
1093                                               guint32     xid,
1094                                               guint       level)
1095 {
1096   Atom type = None;
1097   int format;
1098   unsigned long nitems, after;
1099   unsigned char *data;
1100   Window *ret_children, ret_root, ret_parent;
1101   unsigned int ret_nchildren;
1102   gboolean send = FALSE;
1103   gboolean found = FALSE;
1104   gboolean result = FALSE;
1105   int i;
1106
1107   gdk_x11_display_error_trap_push (display);
1108
1109   if (XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), xid,
1110                           gdk_x11_get_xatom_by_name_for_display (display, "WM_STATE"),
1111                           0, 0, False, AnyPropertyType,
1112                           &type, &format, &nitems, &after, &data) != Success)
1113     goto out;
1114
1115   if (type)
1116     {
1117       send = TRUE;
1118       XFree (data);
1119     }
1120   else
1121     {
1122       /* OK, we're all set, now let's find some windows to send this to */
1123       if (!XQueryTree (GDK_DISPLAY_XDISPLAY (display), xid,
1124                       &ret_root, &ret_parent,
1125                       &ret_children, &ret_nchildren))
1126         goto out;
1127
1128       for(i = 0; i < ret_nchildren; i++)
1129         if (gdk_event_send_client_message_to_all_recurse (display, xev, ret_children[i], level + 1))
1130           found = TRUE;
1131
1132       XFree (ret_children);
1133     }
1134
1135   if (send || (!found && (level == 1)))
1136     {
1137       xev->xclient.window = xid;
1138       _gdk_x11_display_send_xevent (display, xid, False, NoEventMask, xev);
1139     }
1140
1141   result = send || found;
1142
1143  out:
1144   gdk_x11_display_error_trap_pop_ignored (display);
1145
1146   return result;
1147 }
1148
1149 static void
1150 gdk_x11_screen_broadcast_client_message (GdkScreen *screen,
1151                                          GdkEvent  *event)
1152 {
1153   XEvent sev;
1154   GdkWindow *root_window;
1155
1156   g_return_if_fail (event != NULL);
1157
1158   root_window = gdk_screen_get_root_window (screen);
1159
1160   /* Set up our event to send, with the exception of its target window */
1161   sev.xclient.type = ClientMessage;
1162   sev.xclient.display = GDK_WINDOW_XDISPLAY (root_window);
1163   sev.xclient.format = event->client.data_format;
1164   memcpy(&sev.xclient.data, &event->client.data, sizeof (sev.xclient.data));
1165   sev.xclient.message_type =
1166     gdk_x11_atom_to_xatom_for_display (GDK_WINDOW_DISPLAY (root_window),
1167                                        event->client.message_type);
1168
1169   gdk_event_send_client_message_to_all_recurse (gdk_screen_get_display (screen),
1170                                                 &sev,
1171                                                 GDK_WINDOW_XID (root_window),
1172                                                 0);
1173 }
1174
1175 static gboolean
1176 check_transform (const gchar *xsettings_name,
1177                  GType        src_type,
1178                  GType        dest_type)
1179 {
1180   if (!g_value_type_transformable (src_type, dest_type))
1181     {
1182       g_warning ("Cannot transform xsetting %s of type %s to type %s\n",
1183                  xsettings_name,
1184                  g_type_name (src_type),
1185                  g_type_name (dest_type));
1186       return FALSE;
1187     }
1188   else
1189     return TRUE;
1190 }
1191
1192 static gboolean
1193 gdk_x11_screen_get_setting (GdkScreen   *screen,
1194                             const gchar *name,
1195                             GValue      *value)
1196 {
1197
1198   const char *xsettings_name = NULL;
1199   XSettingsResult result;
1200   XSettingsSetting *setting = NULL;
1201   GdkX11Screen *x11_screen;
1202   gboolean success = FALSE;
1203   gint i;
1204   GValue tmp_val = { 0, };
1205
1206   g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
1207
1208   x11_screen = GDK_X11_SCREEN (screen);
1209
1210   for (i = 0; i < GDK_SETTINGS_N_ELEMENTS(); i++)
1211     if (strcmp (GDK_SETTINGS_GDK_NAME (i), name) == 0)
1212       {
1213         xsettings_name = GDK_SETTINGS_X_NAME (i);
1214         break;
1215       }
1216
1217   if (!xsettings_name)
1218     goto out;
1219
1220   result = xsettings_client_get_setting (x11_screen->xsettings_client,
1221                                          xsettings_name, &setting);
1222   if (result != XSETTINGS_SUCCESS)
1223     goto out;
1224
1225   switch (setting->type)
1226     {
1227     case XSETTINGS_TYPE_INT:
1228       if (check_transform (xsettings_name, G_TYPE_INT, G_VALUE_TYPE (value)))
1229         {
1230           g_value_init (&tmp_val, G_TYPE_INT);
1231           g_value_set_int (&tmp_val, setting->data.v_int);
1232           g_value_transform (&tmp_val, value);
1233
1234           success = TRUE;
1235         }
1236       break;
1237     case XSETTINGS_TYPE_STRING:
1238       if (check_transform (xsettings_name, G_TYPE_STRING, G_VALUE_TYPE (value)))
1239         {
1240           g_value_init (&tmp_val, G_TYPE_STRING);
1241           g_value_set_string (&tmp_val, setting->data.v_string);
1242           g_value_transform (&tmp_val, value);
1243
1244           success = TRUE;
1245         }
1246       break;
1247     case XSETTINGS_TYPE_COLOR:
1248       if (!check_transform (xsettings_name, GDK_TYPE_COLOR, G_VALUE_TYPE (value)))
1249         {
1250           GdkColor color;
1251
1252           g_value_init (&tmp_val, GDK_TYPE_COLOR);
1253
1254           color.pixel = 0;
1255           color.red = setting->data.v_color.red;
1256           color.green = setting->data.v_color.green;
1257           color.blue = setting->data.v_color.blue;
1258
1259           g_value_set_boxed (&tmp_val, &color);
1260
1261           g_value_transform (&tmp_val, value);
1262
1263           success = TRUE;
1264         }
1265       break;
1266     }
1267
1268   g_value_unset (&tmp_val);
1269
1270  out:
1271   if (setting)
1272     xsettings_setting_free (setting);
1273
1274   if (success)
1275     return TRUE;
1276   else
1277     return _gdk_x11_get_xft_setting (screen, name, value);
1278 }
1279
1280 static void
1281 cleanup_atoms(gpointer data)
1282 {
1283   NetWmSupportedAtoms *supported_atoms = data;
1284   if (supported_atoms->atoms)
1285       XFree (supported_atoms->atoms);
1286   g_free (supported_atoms);
1287 }
1288
1289 static void
1290 fetch_net_wm_check_window (GdkScreen *screen)
1291 {
1292   GdkX11Screen *x11_screen;
1293   GdkDisplay *display;
1294   Atom type;
1295   gint format;
1296   gulong n_items;
1297   gulong bytes_after;
1298   guchar *data;
1299   Window *xwindow;
1300   GTimeVal tv;
1301   gint error;
1302
1303   x11_screen = GDK_X11_SCREEN (screen);
1304   display = x11_screen->display;
1305
1306   g_return_if_fail (GDK_X11_DISPLAY (display)->trusted_client);
1307
1308   g_get_current_time (&tv);
1309
1310   if (ABS  (tv.tv_sec - x11_screen->last_wmspec_check_time) < 15)
1311     return; /* we've checked recently */
1312
1313   x11_screen->last_wmspec_check_time = tv.tv_sec;
1314
1315   data = NULL;
1316   XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1317                       gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTING_WM_CHECK"),
1318                       0, G_MAXLONG, False, XA_WINDOW, &type, &format,
1319                       &n_items, &bytes_after, &data);
1320
1321   if (type != XA_WINDOW)
1322     {
1323       if (data)
1324         XFree (data);
1325       return;
1326     }
1327
1328   xwindow = (Window *)data;
1329
1330   if (x11_screen->wmspec_check_window == *xwindow)
1331     {
1332       XFree (xwindow);
1333       return;
1334     }
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, *xwindow, StructureNotifyMask);
1340
1341   error = gdk_x11_display_error_trap_pop (display);
1342   if (!error)
1343     {
1344       x11_screen->wmspec_check_window = *xwindow;
1345       x11_screen->need_refetch_net_supported = TRUE;
1346       x11_screen->need_refetch_wm_name = TRUE;
1347
1348       /* Careful, reentrancy */
1349       _gdk_x11_screen_window_manager_changed (GDK_SCREEN (x11_screen));
1350     }
1351   else if (error == BadWindow)
1352     {
1353       /* Leftover property, try again immediately, new wm may be starting up */
1354       x11_screen->last_wmspec_check_time = 0;
1355     }
1356
1357   XFree (xwindow);
1358 }
1359
1360 /**
1361  * gdk_x11_screen_supports_net_wm_hint:
1362  * @screen: the relevant #GdkScreen.
1363  * @property: a property atom.
1364  *
1365  * This function is specific to the X11 backend of GDK, and indicates
1366  * whether the window manager supports a certain hint from the
1367  * Extended Window Manager Hints Specification. You can find this
1368  * specification on
1369  * <ulink url="http://www.freedesktop.org">http://www.freedesktop.org</ulink>.
1370  *
1371  * When using this function, keep in mind that the window manager
1372  * can change over time; so you shouldn't use this function in
1373  * a way that impacts persistent application state. A common bug
1374  * is that your application can start up before the window manager
1375  * does when the user logs in, and before the window manager starts
1376  * gdk_x11_screen_supports_net_wm_hint() will return %FALSE for every property.
1377  * You can monitor the window_manager_changed signal on #GdkScreen to detect
1378  * a window manager change.
1379  *
1380  * Return value: %TRUE if the window manager supports @property
1381  *
1382  * Since: 2.2
1383  **/
1384 gboolean
1385 gdk_x11_screen_supports_net_wm_hint (GdkScreen *screen,
1386                                      GdkAtom    property)
1387 {
1388   gulong i;
1389   GdkX11Screen *x11_screen;
1390   NetWmSupportedAtoms *supported_atoms;
1391   GdkDisplay *display;
1392
1393   g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
1394
1395   x11_screen = GDK_X11_SCREEN (screen);
1396   display = x11_screen->display;
1397
1398   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1399     return FALSE;
1400
1401   supported_atoms = g_object_get_data (G_OBJECT (screen), "gdk-net-wm-supported-atoms");
1402   if (!supported_atoms)
1403     {
1404       supported_atoms = g_new0 (NetWmSupportedAtoms, 1);
1405       g_object_set_data_full (G_OBJECT (screen), "gdk-net-wm-supported-atoms", supported_atoms, cleanup_atoms);
1406     }
1407
1408   fetch_net_wm_check_window (screen);
1409
1410   if (x11_screen->wmspec_check_window == None)
1411     return FALSE;
1412
1413   if (x11_screen->need_refetch_net_supported)
1414     {
1415       /* WM has changed since we last got the supported list,
1416        * refetch it.
1417        */
1418       Atom type;
1419       gint format;
1420       gulong bytes_after;
1421
1422       x11_screen->need_refetch_net_supported = FALSE;
1423
1424       if (supported_atoms->atoms)
1425         XFree (supported_atoms->atoms);
1426
1427       supported_atoms->atoms = NULL;
1428       supported_atoms->n_atoms = 0;
1429
1430       XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), x11_screen->xroot_window,
1431                           gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTED"),
1432                           0, G_MAXLONG, False, XA_ATOM, &type, &format,
1433                           &supported_atoms->n_atoms, &bytes_after,
1434                           (guchar **)&supported_atoms->atoms);
1435
1436       if (type != XA_ATOM)
1437         return FALSE;
1438     }
1439
1440   if (supported_atoms->atoms == NULL)
1441     return FALSE;
1442
1443   i = 0;
1444   while (i < supported_atoms->n_atoms)
1445     {
1446       if (supported_atoms->atoms[i] == gdk_x11_atom_to_xatom_for_display (display, property))
1447         return TRUE;
1448
1449       ++i;
1450     }
1451
1452   return FALSE;
1453 }
1454
1455 static void
1456 refcounted_grab_server (Display *xdisplay)
1457 {
1458   GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);
1459
1460   gdk_x11_display_grab (display);
1461 }
1462
1463 static void
1464 refcounted_ungrab_server (Display *xdisplay)
1465 {
1466   GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);
1467
1468   gdk_x11_display_ungrab (display);
1469 }
1470
1471 static GdkFilterReturn
1472 gdk_xsettings_client_event_filter (GdkXEvent *xevent,
1473                                    GdkEvent  *event,
1474                                    gpointer   data)
1475 {
1476   GdkX11Screen *screen = data;
1477
1478   if (xsettings_client_process_event (screen->xsettings_client, (XEvent *)xevent))
1479     return GDK_FILTER_REMOVE;
1480   else
1481     return GDK_FILTER_CONTINUE;
1482 }
1483
1484 static Bool
1485 gdk_xsettings_watch_cb (Window   window,
1486                         Bool     is_start,
1487                         long     mask,
1488                         void    *cb_data)
1489 {
1490   GdkWindow *gdkwin;
1491   GdkScreen *screen = cb_data;
1492
1493   gdkwin = gdk_x11_window_lookup_for_display (gdk_screen_get_display (screen), window);
1494
1495   if (is_start)
1496     {
1497       if (gdkwin)
1498         g_object_ref (gdkwin);
1499       else
1500         {
1501           gdkwin = gdk_x11_window_foreign_new_for_display (gdk_screen_get_display (screen), window);
1502
1503           /* gdk_window_foreign_new_for_display() can fail and return NULL if the
1504            * window has already been destroyed.
1505            */
1506           if (!gdkwin)
1507             return False;
1508         }
1509
1510       gdk_window_add_filter (gdkwin, gdk_xsettings_client_event_filter, screen);
1511     }
1512   else
1513     {
1514       if (!gdkwin)
1515         {
1516           /* gdkwin should not be NULL here, since if starting the watch succeeded
1517            * we have a reference on the window. It might mean that the caller didn't
1518            * remove the watch when it got a DestroyNotify event. Or maybe the
1519            * caller ignored the return value when starting the watch failed.
1520            */
1521           g_warning ("gdk_xsettings_watch_cb(): Couldn't find window to unwatch");
1522           return False;
1523         }
1524
1525       gdk_window_remove_filter (gdkwin, gdk_xsettings_client_event_filter, screen);
1526       g_object_unref (gdkwin);
1527     }
1528
1529   return True;
1530 }
1531
1532 static void
1533 gdk_xsettings_notify_cb (const char       *name,
1534                          XSettingsAction   action,
1535                          XSettingsSetting *setting,
1536                          void             *data)
1537 {
1538   GdkEvent new_event;
1539   GdkScreen *screen = data;
1540   GdkX11Screen *x11_screen = data;
1541   int i;
1542
1543   if (x11_screen->xsettings_in_init)
1544     return;
1545
1546   new_event.type = GDK_SETTING;
1547   new_event.setting.window = gdk_screen_get_root_window (screen);
1548   new_event.setting.send_event = FALSE;
1549   new_event.setting.name = NULL;
1550
1551   for (i = 0; i < GDK_SETTINGS_N_ELEMENTS() ; i++)
1552     if (strcmp (GDK_SETTINGS_X_NAME (i), name) == 0)
1553       {
1554         new_event.setting.name = (char*) GDK_SETTINGS_GDK_NAME (i);
1555         break;
1556       }
1557
1558   if (!new_event.setting.name)
1559     return;
1560
1561   switch (action)
1562     {
1563     case XSETTINGS_ACTION_NEW:
1564       new_event.setting.action = GDK_SETTING_ACTION_NEW;
1565       break;
1566     case XSETTINGS_ACTION_CHANGED:
1567       new_event.setting.action = GDK_SETTING_ACTION_CHANGED;
1568       break;
1569     case XSETTINGS_ACTION_DELETED:
1570       new_event.setting.action = GDK_SETTING_ACTION_DELETED;
1571       break;
1572     }
1573
1574   gdk_event_put (&new_event);
1575 }
1576
1577 void
1578 _gdk_x11_screen_init_events (GdkScreen *screen)
1579 {
1580   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1581
1582   /* Keep a flag to avoid extra notifies that we don't need
1583    */
1584   x11_screen->xsettings_in_init = TRUE;
1585   x11_screen->xsettings_client = xsettings_client_new_with_grab_funcs (x11_screen->xdisplay,
1586                                                                        x11_screen->screen_num,
1587                                                                        gdk_xsettings_notify_cb,
1588                                                                        gdk_xsettings_watch_cb,
1589                                                                        screen,
1590                                                                        refcounted_grab_server,
1591                                                                        refcounted_ungrab_server);
1592   x11_screen->xsettings_in_init = FALSE;
1593 }
1594
1595 /**
1596  * gdk_x11_screen_get_window_manager_name:
1597  * @screen: a #GdkScreen
1598  *
1599  * Returns the name of the window manager for @screen.
1600  *
1601  * Return value: the name of the window manager screen @screen, or
1602  * "unknown" if the window manager is unknown. The string is owned by GDK
1603  * and should not be freed.
1604  *
1605  * Since: 2.2
1606  **/
1607 const char*
1608 gdk_x11_screen_get_window_manager_name (GdkScreen *screen)
1609 {
1610   GdkX11Screen *x11_screen;
1611   GdkDisplay *display;
1612
1613   x11_screen = GDK_X11_SCREEN (screen);
1614   display = x11_screen->display;
1615
1616   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1617     return x11_screen->window_manager_name;
1618
1619   fetch_net_wm_check_window (screen);
1620
1621   if (x11_screen->need_refetch_wm_name)
1622     {
1623       /* Get the name of the window manager */
1624       x11_screen->need_refetch_wm_name = FALSE;
1625
1626       g_free (x11_screen->window_manager_name);
1627       x11_screen->window_manager_name = g_strdup ("unknown");
1628
1629       if (x11_screen->wmspec_check_window != None)
1630         {
1631           Atom type;
1632           gint format;
1633           gulong n_items;
1634           gulong bytes_after;
1635           gchar *name;
1636
1637           name = NULL;
1638
1639           gdk_x11_display_error_trap_push (display);
1640
1641           XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
1642                               x11_screen->wmspec_check_window,
1643                               gdk_x11_get_xatom_by_name_for_display (display,
1644                                                                      "_NET_WM_NAME"),
1645                               0, G_MAXLONG, False,
1646                               gdk_x11_get_xatom_by_name_for_display (display,
1647                                                                      "UTF8_STRING"),
1648                               &type, &format,
1649                               &n_items, &bytes_after,
1650                               (guchar **)&name);
1651
1652           gdk_x11_display_error_trap_pop_ignored (display);
1653
1654           if (name != NULL)
1655             {
1656               g_free (x11_screen->window_manager_name);
1657               x11_screen->window_manager_name = g_strdup (name);
1658               XFree (name);
1659             }
1660         }
1661     }
1662
1663   return GDK_X11_SCREEN (screen)->window_manager_name;
1664 }
1665
1666 static void
1667 gdk_x11_screen_class_init (GdkX11ScreenClass *klass)
1668 {
1669   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1670   GdkScreenClass *screen_class = GDK_SCREEN_CLASS (klass);
1671
1672   object_class->dispose = gdk_x11_screen_dispose;
1673   object_class->finalize = gdk_x11_screen_finalize;
1674
1675   screen_class->get_display = gdk_x11_screen_get_display;
1676   screen_class->get_width = gdk_x11_screen_get_width;
1677   screen_class->get_height = gdk_x11_screen_get_height;
1678   screen_class->get_width_mm = gdk_x11_screen_get_width_mm;
1679   screen_class->get_height_mm = gdk_x11_screen_get_height_mm;
1680   screen_class->get_number = gdk_x11_screen_get_number;
1681   screen_class->get_root_window = gdk_x11_screen_get_root_window;
1682   screen_class->get_n_monitors = gdk_x11_screen_get_n_monitors;
1683   screen_class->get_primary_monitor = gdk_x11_screen_get_primary_monitor;
1684   screen_class->get_monitor_width_mm = gdk_x11_screen_get_monitor_width_mm;
1685   screen_class->get_monitor_height_mm = gdk_x11_screen_get_monitor_height_mm;
1686   screen_class->get_monitor_plug_name = gdk_x11_screen_get_monitor_plug_name;
1687   screen_class->get_monitor_geometry = gdk_x11_screen_get_monitor_geometry;
1688   screen_class->get_system_visual = _gdk_x11_screen_get_system_visual;
1689   screen_class->get_rgba_visual = gdk_x11_screen_get_rgba_visual;
1690   screen_class->is_composited = gdk_x11_screen_is_composited;
1691   screen_class->make_display_name = gdk_x11_screen_make_display_name;
1692   screen_class->get_active_window = gdk_x11_screen_get_active_window;
1693   screen_class->get_window_stack = gdk_x11_screen_get_window_stack;
1694   screen_class->broadcast_client_message = gdk_x11_screen_broadcast_client_message;
1695   screen_class->get_setting = gdk_x11_screen_get_setting;
1696   screen_class->visual_get_best_depth = _gdk_x11_screen_visual_get_best_depth;
1697   screen_class->visual_get_best_type = _gdk_x11_screen_visual_get_best_type;
1698   screen_class->visual_get_best = _gdk_x11_screen_visual_get_best;
1699   screen_class->visual_get_best_with_depth = _gdk_x11_screen_visual_get_best_with_depth;
1700   screen_class->visual_get_best_with_type = _gdk_x11_screen_visual_get_best_with_type;
1701   screen_class->visual_get_best_with_both = _gdk_x11_screen_visual_get_best_with_both;
1702   screen_class->query_depths = _gdk_x11_screen_query_depths;
1703   screen_class->query_visual_types = _gdk_x11_screen_query_visual_types;
1704   screen_class->list_visuals = _gdk_x11_screen_list_visuals;
1705
1706   signals[WINDOW_MANAGER_CHANGED] =
1707     g_signal_new (g_intern_static_string ("window_manager_changed"),
1708                   G_OBJECT_CLASS_TYPE (object_class),
1709                   G_SIGNAL_RUN_LAST,
1710                   G_STRUCT_OFFSET (GdkX11ScreenClass, window_manager_changed),
1711                   NULL, NULL,
1712                   g_cclosure_marshal_VOID__VOID,
1713                   G_TYPE_NONE,
1714                   0);
1715 }