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:
 269  * @screen: (type GdkX11Screen): 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: (type GdkX11Screen): 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: (type GdkX11Screen): 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   gint           primary_monitor;
 871   GdkX11Monitor *monitors;
 872   gboolean changed;
 873
 874   primary_monitor = x11_screen->primary_monitor;
 875   n_monitors = x11_screen->n_monitors;
 876   monitors = x11_screen->monitors;
 877
 878   x11_screen->n_monitors = 0;
 879   x11_screen->monitors = NULL;
 880
 881   init_multihead (screen);
 882
 883   changed =
 884     !compare_monitors (monitors, n_monitors,
 885                        x11_screen->monitors, x11_screen->n_monitors) ||
 886     x11_screen->primary_monitor != primary_monitor;
 887
 888
 889   free_monitors (monitors, n_monitors);
 890
 891   if (changed)
 892     g_signal_emit_by_name (screen, "monitors-changed");
 893 }
 894
 895 void
 896 _gdk_x11_screen_size_changed (GdkScreen *screen,
 897                               XEvent    *event)
 898 {
 899   gint width, height;
 900 #ifdef HAVE_RANDR
 901   GdkX11Display *display_x11;
 902 #endif
 903
 904   width = gdk_screen_get_width (screen);
 905   height = gdk_screen_get_height (screen);
 906
 907 #ifdef HAVE_RANDR
 908   display_x11 = GDK_X11_DISPLAY (gdk_screen_get_display (screen));
 909
 910   if (display_x11->have_randr13 && event->type == ConfigureNotify)
 911     return;
 912
 913   XRRUpdateConfiguration (event);
 914 #else
 915   if (event->type == ConfigureNotify)
 916     {
 917       XConfigureEvent *rcevent = (XConfigureEvent *) event;
 918       Screen        *xscreen = gdk_x11_screen_get_xscreen (screen);
 919
 920       xscreen->width   = rcevent->width;
 921       xscreen->height  = rcevent->height;
 922     }
 923   else
 924     return;
 925 #endif
 926
 927   process_monitors_change (screen);
 928
 929   if (width != gdk_screen_get_width (screen) ||
 930       height != gdk_screen_get_height (screen))
 931     g_signal_emit_by_name (screen, "size-changed");
 932 }
 933
 934 void
 935 _gdk_x11_screen_window_manager_changed (GdkScreen *screen)
 936 {
 937   g_signal_emit (screen, signals[WINDOW_MANAGER_CHANGED], 0);
 938 }
 939
 940 void
 941 _gdk_x11_screen_process_owner_change (GdkScreen *screen,
 942                                       XEvent *event)
 943 {
 944 #ifdef HAVE_XFIXES
 945   XFixesSelectionNotifyEvent *selection_event = (XFixesSelectionNotifyEvent *)event;
 946   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
 947   Atom xcm_selection_atom = gdk_x11_atom_to_xatom_for_display (x11_screen->display,
 948                                                                x11_screen->cm_selection_atom);
 949
 950   if (selection_event->selection == xcm_selection_atom)
 951     {
 952       gboolean composited = selection_event->owner != None;
 953
 954       if (composited != x11_screen->is_composited)
 955         {
 956           x11_screen->is_composited = composited;
 957
 958           g_signal_emit_by_name (screen, "composited-changed");
 959         }
 960     }
 961 #endif
 962 }
 963
 964 static gchar *
 965 substitute_screen_number (const gchar *display_name,
 966                           gint         screen_number)
 967 {
 968   GString *str;
 969   gchar   *p;
 970
 971   str = g_string_new (display_name);
 972
 973   p = strrchr (str->str, '.');
 974   if (p && p >  strchr (str->str, ':'))
 975     g_string_truncate (str, p - str->str);
 976
 977   g_string_append_printf (str, ".%d", screen_number);
 978
 979   return g_string_free (str, FALSE);
 980 }
 981
 982 static gchar *
 983 gdk_x11_screen_make_display_name (GdkScreen *screen)
 984 {
 985   const gchar *old_display;
 986
 987   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
 988
 989   old_display = gdk_display_get_name (gdk_screen_get_display (screen));
 990
 991   return substitute_screen_number (old_display,
 992                                    gdk_screen_get_number (screen));
 993 }
 994
 995 static GdkWindow *
 996 gdk_x11_screen_get_active_window (GdkScreen *screen)
 997 {
 998   GdkX11Screen *x11_screen;
 999   GdkWindow *ret = NULL;
1000   Atom type_return;
1001   gint format_return;
1002   gulong nitems_return;
1003   gulong bytes_after_return;
1004   guchar *data = NULL;
1005
1006   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
1007
1008   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1009                                             gdk_atom_intern_static_string ("_NET_ACTIVE_WINDOW")))
1010     return NULL;
1011
1012   x11_screen = GDK_X11_SCREEN (screen);
1013
1014   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1015                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1016                                                                  "_NET_ACTIVE_WINDOW"),
1017                           0, 1, False, XA_WINDOW, &type_return,
1018                           &format_return, &nitems_return,
1019                           &bytes_after_return, &data)
1020       == Success)
1021     {
1022       if ((type_return == XA_WINDOW) && (format_return == 32) && (data))
1023         {
1024           Window window = *(Window *) data;
1025
1026           if (window != None)
1027             {
1028               ret = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1029                                                             window);
1030             }
1031         }
1032     }
1033
1034   if (data)
1035     XFree (data);
1036
1037   return ret;
1038 }
1039
1040 static GList *
1041 gdk_x11_screen_get_window_stack (GdkScreen *screen)
1042 {
1043   GdkX11Screen *x11_screen;
1044   GList *ret = NULL;
1045   Atom type_return;
1046   gint format_return;
1047   gulong nitems_return;
1048   gulong bytes_after_return;
1049   guchar *data = NULL;
1050
1051   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
1052
1053   if (!gdk_x11_screen_supports_net_wm_hint (screen,
1054                                             gdk_atom_intern_static_string ("_NET_CLIENT_LIST_STACKING")))
1055     return NULL;
1056
1057   x11_screen = GDK_X11_SCREEN (screen);
1058
1059   if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1060                           gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
1061                                                                  "_NET_CLIENT_LIST_STACKING"),
1062                           0, G_MAXLONG, False, XA_WINDOW, &type_return,
1063                           &format_return, &nitems_return,
1064                           &bytes_after_return, &data)
1065       == Success)
1066     {
1067       if ((type_return == XA_WINDOW) && (format_return == 32) &&
1068           (data) && (nitems_return > 0))
1069         {
1070           gulong *stack = (gulong *) data;
1071           GdkWindow *win;
1072           int i;
1073
1074           for (i = 0; i < nitems_return; i++)
1075             {
1076               win = gdk_x11_window_foreign_new_for_display (x11_screen->display,
1077                                                             (Window)stack[i]);
1078
1079               if (win != NULL)
1080                 ret = g_list_append (ret, win);
1081             }
1082         }
1083     }
1084
1085   if (data)
1086     XFree (data);
1087
1088   return ret;
1089 }
1090
1091 static gboolean
1092 check_transform (const gchar *xsettings_name,
1093                  GType        src_type,
1094                  GType        dest_type)
1095 {
1096   if (!g_value_type_transformable (src_type, dest_type))
1097     {
1098       g_warning ("Cannot transform xsetting %s of type %s to type %s\n",
1099                  xsettings_name,
1100                  g_type_name (src_type),
1101                  g_type_name (dest_type));
1102       return FALSE;
1103     }
1104   else
1105     return TRUE;
1106 }
1107
1108 static gboolean
1109 gdk_x11_screen_get_setting (GdkScreen   *screen,
1110                             const gchar *name,
1111                             GValue      *value)
1112 {
1113
1114   const char *xsettings_name = NULL;
1115   XSettingsResult result;
1116   XSettingsSetting *setting = NULL;
1117   GdkX11Screen *x11_screen;
1118   gboolean success = FALSE;
1119   gint i;
1120   GValue tmp_val = G_VALUE_INIT;
1121
1122   g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
1123
1124   x11_screen = GDK_X11_SCREEN (screen);
1125
1126   for (i = 0; i < GDK_SETTINGS_N_ELEMENTS(); i++)
1127     if (strcmp (GDK_SETTINGS_GDK_NAME (i), name) == 0)
1128       {
1129         xsettings_name = GDK_SETTINGS_X_NAME (i);
1130         break;
1131       }
1132
1133   if (!xsettings_name)
1134     goto out;
1135
1136   result = xsettings_client_get_setting (x11_screen->xsettings_client,
1137                                          xsettings_name, &setting);
1138   if (result != XSETTINGS_SUCCESS)
1139     goto out;
1140
1141   switch (setting->type)
1142     {
1143     case XSETTINGS_TYPE_INT:
1144       if (check_transform (xsettings_name, G_TYPE_INT, G_VALUE_TYPE (value)))
1145         {
1146           g_value_init (&tmp_val, G_TYPE_INT);
1147           g_value_set_int (&tmp_val, setting->data.v_int);
1148           g_value_transform (&tmp_val, value);
1149
1150           success = TRUE;
1151         }
1152       break;
1153     case XSETTINGS_TYPE_STRING:
1154       if (check_transform (xsettings_name, G_TYPE_STRING, G_VALUE_TYPE (value)))
1155         {
1156           g_value_init (&tmp_val, G_TYPE_STRING);
1157           g_value_set_string (&tmp_val, setting->data.v_string);
1158           g_value_transform (&tmp_val, value);
1159
1160           success = TRUE;
1161         }
1162       break;
1163     case XSETTINGS_TYPE_COLOR:
1164       if (!check_transform (xsettings_name, GDK_TYPE_RGBA, G_VALUE_TYPE (value)))
1165         {
1166           GdkRGBA rgba;
1167
1168           g_value_init (&tmp_val, GDK_TYPE_RGBA);
1169
1170           rgba.red = setting->data.v_color.red / 65535.0;
1171           rgba.green = setting->data.v_color.green / 65535.0;
1172           rgba.blue = setting->data.v_color.blue / 65535.0;
1173           rgba.alpha = setting->data.v_color.alpha / 65535.0;
1174
1175           g_value_set_boxed (&tmp_val, &rgba);
1176
1177           g_value_transform (&tmp_val, value);
1178
1179           success = TRUE;
1180         }
1181       break;
1182     }
1183
1184   g_value_unset (&tmp_val);
1185
1186  out:
1187   if (setting)
1188     xsettings_setting_free (setting);
1189
1190   if (success)
1191     return TRUE;
1192   else
1193     return _gdk_x11_get_xft_setting (screen, name, value);
1194 }
1195
1196 static void
1197 cleanup_atoms(gpointer data)
1198 {
1199   NetWmSupportedAtoms *supported_atoms = data;
1200   if (supported_atoms->atoms)
1201       XFree (supported_atoms->atoms);
1202   g_free (supported_atoms);
1203 }
1204
1205 static void
1206 fetch_net_wm_check_window (GdkScreen *screen)
1207 {
1208   GdkX11Screen *x11_screen;
1209   GdkDisplay *display;
1210   Atom type;
1211   gint format;
1212   gulong n_items;
1213   gulong bytes_after;
1214   guchar *data;
1215   Window *xwindow;
1216   GTimeVal tv;
1217   gint error;
1218
1219   x11_screen = GDK_X11_SCREEN (screen);
1220   display = x11_screen->display;
1221
1222   g_return_if_fail (GDK_X11_DISPLAY (display)->trusted_client);
1223
1224   g_get_current_time (&tv);
1225
1226   if (ABS  (tv.tv_sec - x11_screen->last_wmspec_check_time) < 15)
1227     return; /* we've checked recently */
1228
1229   x11_screen->last_wmspec_check_time = tv.tv_sec;
1230
1231   data = NULL;
1232   XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
1233                       gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTING_WM_CHECK"),
1234                       0, G_MAXLONG, False, XA_WINDOW, &type, &format,
1235                       &n_items, &bytes_after, &data);
1236
1237   if (type != XA_WINDOW)
1238     {
1239       if (data)
1240         XFree (data);
1241       return;
1242     }
1243
1244   xwindow = (Window *)data;
1245
1246   if (x11_screen->wmspec_check_window == *xwindow)
1247     {
1248       XFree (xwindow);
1249       return;
1250     }
1251
1252   gdk_x11_display_error_trap_push (display);
1253
1254   /* Find out if this WM goes away, so we can reset everything. */
1255   XSelectInput (x11_screen->xdisplay, *xwindow, StructureNotifyMask);
1256
1257   error = gdk_x11_display_error_trap_pop (display);
1258   if (!error)
1259     {
1260       x11_screen->wmspec_check_window = *xwindow;
1261       x11_screen->need_refetch_net_supported = TRUE;
1262       x11_screen->need_refetch_wm_name = TRUE;
1263
1264       /* Careful, reentrancy */
1265       _gdk_x11_screen_window_manager_changed (GDK_SCREEN (x11_screen));
1266     }
1267   else if (error == BadWindow)
1268     {
1269       /* Leftover property, try again immediately, new wm may be starting up */
1270       x11_screen->last_wmspec_check_time = 0;
1271     }
1272
1273   XFree (xwindow);
1274 }
1275
1276 /**
1277  * gdk_x11_screen_supports_net_wm_hint:
1278  * @screen: (type GdkX11Screen): the relevant #GdkScreen.
1279  * @property: a property atom.
1280  *
1281  * This function is specific to the X11 backend of GDK, and indicates
1282  * whether the window manager supports a certain hint from the
1283  * Extended Window Manager Hints Specification. You can find this
1284  * specification on
1285  * <ulink url="http://www.freedesktop.org">http://www.freedesktop.org</ulink>.
1286  *
1287  * When using this function, keep in mind that the window manager
1288  * can change over time; so you shouldn't use this function in
1289  * a way that impacts persistent application state. A common bug
1290  * is that your application can start up before the window manager
1291  * does when the user logs in, and before the window manager starts
1292  * gdk_x11_screen_supports_net_wm_hint() will return %FALSE for every property.
1293  * You can monitor the window_manager_changed signal on #GdkScreen to detect
1294  * a window manager change.
1295  *
1296  * Return value: %TRUE if the window manager supports @property
1297  *
1298  * Since: 2.2
1299  **/
1300 gboolean
1301 gdk_x11_screen_supports_net_wm_hint (GdkScreen *screen,
1302                                      GdkAtom    property)
1303 {
1304   gulong i;
1305   GdkX11Screen *x11_screen;
1306   NetWmSupportedAtoms *supported_atoms;
1307   GdkDisplay *display;
1308
1309   g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
1310
1311   x11_screen = GDK_X11_SCREEN (screen);
1312   display = x11_screen->display;
1313
1314   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1315     return FALSE;
1316
1317   supported_atoms = g_object_get_data (G_OBJECT (screen), "gdk-net-wm-supported-atoms");
1318   if (!supported_atoms)
1319     {
1320       supported_atoms = g_new0 (NetWmSupportedAtoms, 1);
1321       g_object_set_data_full (G_OBJECT (screen), "gdk-net-wm-supported-atoms", supported_atoms, cleanup_atoms);
1322     }
1323
1324   fetch_net_wm_check_window (screen);
1325
1326   if (x11_screen->wmspec_check_window == None)
1327     return FALSE;
1328
1329   if (x11_screen->need_refetch_net_supported)
1330     {
1331       /* WM has changed since we last got the supported list,
1332        * refetch it.
1333        */
1334       Atom type;
1335       gint format;
1336       gulong bytes_after;
1337
1338       x11_screen->need_refetch_net_supported = FALSE;
1339
1340       if (supported_atoms->atoms)
1341         XFree (supported_atoms->atoms);
1342
1343       supported_atoms->atoms = NULL;
1344       supported_atoms->n_atoms = 0;
1345
1346       XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), x11_screen->xroot_window,
1347                           gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTED"),
1348                           0, G_MAXLONG, False, XA_ATOM, &type, &format,
1349                           &supported_atoms->n_atoms, &bytes_after,
1350                           (guchar **)&supported_atoms->atoms);
1351
1352       if (type != XA_ATOM)
1353         return FALSE;
1354     }
1355
1356   if (supported_atoms->atoms == NULL)
1357     return FALSE;
1358
1359   i = 0;
1360   while (i < supported_atoms->n_atoms)
1361     {
1362       if (supported_atoms->atoms[i] == gdk_x11_atom_to_xatom_for_display (display, property))
1363         return TRUE;
1364
1365       ++i;
1366     }
1367
1368   return FALSE;
1369 }
1370
1371 static void
1372 refcounted_grab_server (Display *xdisplay)
1373 {
1374   GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);
1375
1376   gdk_x11_display_grab (display);
1377 }
1378
1379 static void
1380 refcounted_ungrab_server (Display *xdisplay)
1381 {
1382   GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);
1383
1384   gdk_x11_display_ungrab (display);
1385 }
1386
1387 static GdkFilterReturn
1388 gdk_xsettings_client_event_filter (GdkXEvent *xevent,
1389                                    GdkEvent  *event,
1390                                    gpointer   data)
1391 {
1392   GdkX11Screen *screen = data;
1393
1394   if (xsettings_client_process_event (screen->xsettings_client, (XEvent *)xevent))
1395     return GDK_FILTER_REMOVE;
1396   else
1397     return GDK_FILTER_CONTINUE;
1398 }
1399
1400 static Bool
1401 gdk_xsettings_watch_cb (Window   window,
1402                         Bool     is_start,
1403                         long     mask,
1404                         void    *cb_data)
1405 {
1406   GdkWindow *gdkwin;
1407   GdkScreen *screen = cb_data;
1408
1409   gdkwin = gdk_x11_window_lookup_for_display (gdk_screen_get_display (screen), window);
1410
1411   if (is_start)
1412     {
1413       if (gdkwin)
1414         g_object_ref (gdkwin);
1415       else
1416         {
1417           gdkwin = gdk_x11_window_foreign_new_for_display (gdk_screen_get_display (screen), window);
1418
1419           /* gdk_window_foreign_new_for_display() can fail and return NULL if the
1420            * window has already been destroyed.
1421            */
1422           if (!gdkwin)
1423             return False;
1424         }
1425
1426       gdk_window_add_filter (gdkwin, gdk_xsettings_client_event_filter, screen);
1427     }
1428   else
1429     {
1430       if (!gdkwin)
1431         {
1432           /* gdkwin should not be NULL here, since if starting the watch succeeded
1433            * we have a reference on the window. It might mean that the caller didn't
1434            * remove the watch when it got a DestroyNotify event. Or maybe the
1435            * caller ignored the return value when starting the watch failed.
1436            */
1437           g_warning ("gdk_xsettings_watch_cb(): Couldn't find window to unwatch");
1438           return False;
1439         }
1440
1441       gdk_window_remove_filter (gdkwin, gdk_xsettings_client_event_filter, screen);
1442       g_object_unref (gdkwin);
1443     }
1444
1445   return True;
1446 }
1447
1448 static void
1449 gdk_xsettings_notify_cb (const char       *name,
1450                          XSettingsAction   action,
1451                          XSettingsSetting *setting,
1452                          void             *data)
1453 {
1454   GdkEvent new_event;
1455   GdkScreen *screen = data;
1456   GdkX11Screen *x11_screen = data;
1457   int i;
1458
1459   if (x11_screen->xsettings_in_init)
1460     return;
1461
1462   new_event.type = GDK_SETTING;
1463   new_event.setting.window = gdk_screen_get_root_window (screen);
1464   new_event.setting.send_event = FALSE;
1465   new_event.setting.name = NULL;
1466
1467   for (i = 0; i < GDK_SETTINGS_N_ELEMENTS() ; i++)
1468     if (strcmp (GDK_SETTINGS_X_NAME (i), name) == 0)
1469       {
1470         new_event.setting.name = (char*) GDK_SETTINGS_GDK_NAME (i);
1471         break;
1472       }
1473
1474   if (!new_event.setting.name)
1475     return;
1476
1477   switch (action)
1478     {
1479     case XSETTINGS_ACTION_NEW:
1480       new_event.setting.action = GDK_SETTING_ACTION_NEW;
1481       break;
1482     case XSETTINGS_ACTION_CHANGED:
1483       new_event.setting.action = GDK_SETTING_ACTION_CHANGED;
1484       break;
1485     case XSETTINGS_ACTION_DELETED:
1486       new_event.setting.action = GDK_SETTING_ACTION_DELETED;
1487       break;
1488     }
1489
1490   gdk_event_put (&new_event);
1491 }
1492
1493 void
1494 _gdk_x11_screen_init_events (GdkScreen *screen)
1495 {
1496   GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
1497
1498   /* Keep a flag to avoid extra notifies that we don't need
1499    */
1500   x11_screen->xsettings_in_init = TRUE;
1501   x11_screen->xsettings_client = xsettings_client_new_with_grab_funcs (x11_screen->xdisplay,
1502                                                                        x11_screen->screen_num,
1503                                                                        gdk_xsettings_notify_cb,
1504                                                                        gdk_xsettings_watch_cb,
1505                                                                        screen,
1506                                                                        refcounted_grab_server,
1507                                                                        refcounted_ungrab_server);
1508   x11_screen->xsettings_in_init = FALSE;
1509 }
1510
1511 /**
1512  * gdk_x11_screen_get_window_manager_name:
1513  * @screen: (type GdkX11Screen): a #GdkScreen
1514  *
1515  * Returns the name of the window manager for @screen.
1516  *
1517  * Return value: the name of the window manager screen @screen, or
1518  * "unknown" if the window manager is unknown. The string is owned by GDK
1519  * and should not be freed.
1520  *
1521  * Since: 2.2
1522  **/
1523 const char*
1524 gdk_x11_screen_get_window_manager_name (GdkScreen *screen)
1525 {
1526   GdkX11Screen *x11_screen;
1527   GdkDisplay *display;
1528
1529   x11_screen = GDK_X11_SCREEN (screen);
1530   display = x11_screen->display;
1531
1532   if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
1533     return x11_screen->window_manager_name;
1534
1535   fetch_net_wm_check_window (screen);
1536
1537   if (x11_screen->need_refetch_wm_name)
1538     {
1539       /* Get the name of the window manager */
1540       x11_screen->need_refetch_wm_name = FALSE;
1541
1542       g_free (x11_screen->window_manager_name);
1543       x11_screen->window_manager_name = g_strdup ("unknown");
1544
1545       if (x11_screen->wmspec_check_window != None)
1546         {
1547           Atom type;
1548           gint format;
1549           gulong n_items;
1550           gulong bytes_after;
1551           gchar *name;
1552
1553           name = NULL;
1554
1555           gdk_x11_display_error_trap_push (display);
1556
1557           XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
1558                               x11_screen->wmspec_check_window,
1559                               gdk_x11_get_xatom_by_name_for_display (display,
1560                                                                      "_NET_WM_NAME"),
1561                               0, G_MAXLONG, False,
1562                               gdk_x11_get_xatom_by_name_for_display (display,
1563                                                                      "UTF8_STRING"),
1564                               &type, &format,
1565                               &n_items, &bytes_after,
1566                               (guchar **)&name);
1567
1568           gdk_x11_display_error_trap_pop_ignored (display);
1569
1570           if (name != NULL)
1571             {
1572               g_free (x11_screen->window_manager_name);
1573               x11_screen->window_manager_name = g_strdup (name);
1574               XFree (name);
1575             }
1576         }
1577     }
1578
1579   return GDK_X11_SCREEN (screen)->window_manager_name;
1580 }
1581
1582 static void
1583 gdk_x11_screen_class_init (GdkX11ScreenClass *klass)
1584 {
1585   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1586   GdkScreenClass *screen_class = GDK_SCREEN_CLASS (klass);
1587
1588   object_class->dispose = gdk_x11_screen_dispose;
1589   object_class->finalize = gdk_x11_screen_finalize;
1590
1591   screen_class->get_display = gdk_x11_screen_get_display;
1592   screen_class->get_width = gdk_x11_screen_get_width;
1593   screen_class->get_height = gdk_x11_screen_get_height;
1594   screen_class->get_width_mm = gdk_x11_screen_get_width_mm;
1595   screen_class->get_height_mm = gdk_x11_screen_get_height_mm;
1596   screen_class->get_number = gdk_x11_screen_get_number;
1597   screen_class->get_root_window = gdk_x11_screen_get_root_window;
1598   screen_class->get_n_monitors = gdk_x11_screen_get_n_monitors;
1599   screen_class->get_primary_monitor = gdk_x11_screen_get_primary_monitor;
1600   screen_class->get_monitor_width_mm = gdk_x11_screen_get_monitor_width_mm;
1601   screen_class->get_monitor_height_mm = gdk_x11_screen_get_monitor_height_mm;
1602   screen_class->get_monitor_plug_name = gdk_x11_screen_get_monitor_plug_name;
1603   screen_class->get_monitor_geometry = gdk_x11_screen_get_monitor_geometry;
1604   screen_class->get_system_visual = _gdk_x11_screen_get_system_visual;
1605   screen_class->get_rgba_visual = gdk_x11_screen_get_rgba_visual;
1606   screen_class->is_composited = gdk_x11_screen_is_composited;
1607   screen_class->make_display_name = gdk_x11_screen_make_display_name;
1608   screen_class->get_active_window = gdk_x11_screen_get_active_window;
1609   screen_class->get_window_stack = gdk_x11_screen_get_window_stack;
1610   screen_class->get_setting = gdk_x11_screen_get_setting;
1611   screen_class->visual_get_best_depth = _gdk_x11_screen_visual_get_best_depth;
1612   screen_class->visual_get_best_type = _gdk_x11_screen_visual_get_best_type;
1613   screen_class->visual_get_best = _gdk_x11_screen_visual_get_best;
1614   screen_class->visual_get_best_with_depth = _gdk_x11_screen_visual_get_best_with_depth;
1615   screen_class->visual_get_best_with_type = _gdk_x11_screen_visual_get_best_with_type;
1616   screen_class->visual_get_best_with_both = _gdk_x11_screen_visual_get_best_with_both;
1617   screen_class->query_depths = _gdk_x11_screen_query_depths;
1618   screen_class->query_visual_types = _gdk_x11_screen_query_visual_types;
1619   screen_class->list_visuals = _gdk_x11_screen_list_visuals;
1620
1621   signals[WINDOW_MANAGER_CHANGED] =
1622     g_signal_new (g_intern_static_string ("window_manager_changed"),
1623                   G_OBJECT_CLASS_TYPE (object_class),
1624                   G_SIGNAL_RUN_LAST,
1625                   G_STRUCT_OFFSET (GdkX11ScreenClass, window_manager_changed),
1626                   NULL, NULL,
1627                   g_cclosure_marshal_VOID__VOID,
1628                   G_TYPE_NONE,
1629                   0);
1630 }