ewmh.c

   1 /*
   2  * ewmh.c - EWMH support functions
   3  *
   4  * Copyright © 2007-2009 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24
  25 #include <xcb/xcb.h>
  26 #include <xcb/xcb_atom.h>
  27
  28 #include "ewmh.h"
  29 #include "tag.h"
  30 #include "screen.h"
  31 #include "client.h"
  32 #include "widget.h"
  33 #include "wibox.h"
  34 #include "luaa.h"
  35 #include "common/atoms.h"
  36 #include "common/buffer.h"
  37 #include "common/xutil.h"
  38
  39 #define _NET_WM_STATE_REMOVE 0
  40 #define _NET_WM_STATE_ADD 1
  41 #define _NET_WM_STATE_TOGGLE 2
  42
  43 /** Update the desktop geometry.
  44  * \param phys_screen The physical screen id.
  45  */
  46 static void
  47 ewmh_update_desktop_geometry(int phys_screen)
  48 {
  49     area_t geom = screen_area_get(&globalconf.screens.tab[phys_screen], false);
  50     uint32_t sizes[] = { geom.width, geom.height };
  51
  52     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
  53                         xutil_screen_get(globalconf.connection, phys_screen)->root,
  54                         _NET_DESKTOP_GEOMETRY, CARDINAL, 32, countof(sizes), sizes);
  55 }
  56
  57 void
  58 ewmh_init(int phys_screen)
  59 {
  60     xcb_window_t father;
  61     xcb_screen_t *xscreen = xutil_screen_get(globalconf.connection, phys_screen);
  62     xcb_atom_t atom[] =
  63     {
  64         _NET_SUPPORTED,
  65         _NET_SUPPORTING_WM_CHECK,
  66         _NET_STARTUP_ID,
  67         _NET_CLIENT_LIST,
  68         _NET_CLIENT_LIST_STACKING,
  69         _NET_NUMBER_OF_DESKTOPS,
  70         _NET_CURRENT_DESKTOP,
  71         _NET_DESKTOP_NAMES,
  72         _NET_ACTIVE_WINDOW,
  73         _NET_DESKTOP_GEOMETRY,
  74         _NET_CLOSE_WINDOW,
  75         _NET_WM_NAME,
  76         _NET_WM_STRUT_PARTIAL,
  77         _NET_WM_ICON_NAME,
  78         _NET_WM_VISIBLE_ICON_NAME,
  79         _NET_WM_DESKTOP,
  80         _NET_WM_WINDOW_TYPE,
  81         _NET_WM_WINDOW_TYPE_DESKTOP,
  82         _NET_WM_WINDOW_TYPE_DOCK,
  83         _NET_WM_WINDOW_TYPE_TOOLBAR,
  84         _NET_WM_WINDOW_TYPE_MENU,
  85         _NET_WM_WINDOW_TYPE_UTILITY,
  86         _NET_WM_WINDOW_TYPE_SPLASH,
  87         _NET_WM_WINDOW_TYPE_DIALOG,
  88         _NET_WM_WINDOW_TYPE_DROPDOWN_MENU,
  89         _NET_WM_WINDOW_TYPE_POPUP_MENU,
  90         _NET_WM_WINDOW_TYPE_TOOLTIP,
  91         _NET_WM_WINDOW_TYPE_NOTIFICATION,
  92         _NET_WM_WINDOW_TYPE_COMBO,
  93         _NET_WM_WINDOW_TYPE_DND,
  94         _NET_WM_WINDOW_TYPE_NORMAL,
  95         _NET_WM_ICON,
  96         _NET_WM_PID,
  97         _NET_WM_STATE,
  98         _NET_WM_STATE_STICKY,
  99         _NET_WM_STATE_SKIP_TASKBAR,
 100         _NET_WM_STATE_FULLSCREEN,
 101         _NET_WM_STATE_MAXIMIZED_HORZ,
 102         _NET_WM_STATE_MAXIMIZED_VERT,
 103         _NET_WM_STATE_ABOVE,
 104         _NET_WM_STATE_BELOW,
 105         _NET_WM_STATE_MODAL,
 106         _NET_WM_STATE_HIDDEN,
 107         _NET_WM_STATE_DEMANDS_ATTENTION
 108     };
 109     int i;
 110
 111     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 112                         xscreen->root, _NET_SUPPORTED, ATOM, 32,
 113                         countof(atom), atom);
 114
 115     /* create our own window */
 116     father = xcb_generate_id(globalconf.connection);
 117     xcb_create_window(globalconf.connection, xscreen->root_depth,
 118                       father, xscreen->root, -1, -1, 1, 1, 0,
 119                       XCB_COPY_FROM_PARENT, xscreen->root_visual, 0, NULL);
 120
 121     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 122                         xscreen->root, _NET_SUPPORTING_WM_CHECK, WINDOW, 32,
 123                         1, &father);
 124
 125     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 126                         father, _NET_SUPPORTING_WM_CHECK, WINDOW, 32,
 127                         1, &father);
 128
 129     /* set the window manager name */
 130     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 131                         father, _NET_WM_NAME, UTF8_STRING, 8, 7, "awesome");
 132
 133     /* set the window manager PID */
 134     i = getpid();
 135     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 136                         father, _NET_WM_PID, CARDINAL, 32, 1, &i);
 137
 138     ewmh_update_desktop_geometry(phys_screen);
 139 }
 140
 141 void
 142 ewmh_update_net_client_list(int phys_screen)
 143 {
 144     xcb_window_t *wins = p_alloca(xcb_window_t, globalconf.clients.len);
 145
 146     int n = 0;
 147     foreach(_c, globalconf.clients)
 148     {
 149         client_t *c = *_c;
 150         if(c->phys_screen == phys_screen)
 151             wins[n++] = c->window;
 152     }
 153
 154     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 155                         xutil_screen_get(globalconf.connection, phys_screen)->root,
 156                         _NET_CLIENT_LIST, WINDOW, 32, n, wins);
 157 }
 158
 159 /** Set the client list in stacking order, bottom to top.
 160  * \param phys_screen The physical screen id.
 161  */
 162 void
 163 ewmh_update_net_client_list_stacking(int phys_screen)
 164 {
 165     int n = 0;
 166     xcb_window_t *wins = p_alloca(xcb_window_t, globalconf.stack.len);
 167
 168     foreach(client, globalconf.stack)
 169         if((*client)->phys_screen == phys_screen)
 170             wins[n++] = (*client)->window;
 171
 172     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 173                         xutil_screen_get(globalconf.connection, phys_screen)->root,
 174                         _NET_CLIENT_LIST_STACKING, WINDOW, 32, n, wins);
 175 }
 176
 177 void
 178 ewmh_update_net_numbers_of_desktop(int phys_screen)
 179 {
 180     uint32_t count = globalconf.screens.tab[phys_screen].tags.len;
 181
 182     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 183                         xutil_screen_get(globalconf.connection, phys_screen)->root,
 184                         _NET_NUMBER_OF_DESKTOPS, CARDINAL, 32, 1, &count);
 185 }
 186
 187 void
 188 ewmh_update_net_current_desktop(int phys_screen)
 189 {
 190     uint32_t idx = tags_get_first_selected_index(&globalconf.screens.tab[phys_screen]);
 191
 192     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 193                         xutil_screen_get(globalconf.connection, phys_screen)->root,
 194                         _NET_CURRENT_DESKTOP, CARDINAL, 32, 1, &idx);
 195 }
 196
 197 void
 198 ewmh_update_net_desktop_names(int phys_screen)
 199 {
 200     buffer_t buf;
 201
 202     buffer_inita(&buf, BUFSIZ);
 203
 204     foreach(tag, globalconf.screens.tab[phys_screen].tags)
 205     {
 206         buffer_adds(&buf, tag_get_name(*tag));
 207         buffer_addc(&buf, '\0');
 208     }
 209
 210     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 211                         xutil_screen_get(globalconf.connection, phys_screen)->root,
 212                         _NET_DESKTOP_NAMES, UTF8_STRING, 8, buf.len, buf.s);
 213     buffer_wipe(&buf);
 214 }
 215
 216 void
 217 ewmh_update_net_active_window(int phys_screen)
 218 {
 219     xcb_window_t win;
 220
 221     if(globalconf.screen_focus->client_focus
 222        && globalconf.screen_focus->client_focus->phys_screen == phys_screen)
 223         win = globalconf.screen_focus->client_focus->window;
 224     else
 225         win = XCB_NONE;
 226
 227     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 228                         xutil_screen_get(globalconf.connection, phys_screen)->root,
 229                         _NET_ACTIVE_WINDOW, WINDOW, 32, 1, &win);
 230 }
 231
 232 static void
 233 ewmh_process_state_atom(client_t *c, xcb_atom_t state, int set)
 234 {
 235     luaA_object_push(globalconf.L, c);
 236
 237     if(state == _NET_WM_STATE_STICKY)
 238     {
 239         if(set == _NET_WM_STATE_REMOVE)
 240             client_set_sticky(globalconf.L, -1, false);
 241         else if(set == _NET_WM_STATE_ADD)
 242             client_set_sticky(globalconf.L, -1, true);
 243         else if(set == _NET_WM_STATE_TOGGLE)
 244             client_set_sticky(globalconf.L, -1, !c->sticky);
 245     }
 246     else if(state == _NET_WM_STATE_SKIP_TASKBAR)
 247     {
 248         if(set == _NET_WM_STATE_REMOVE)
 249         {
 250             client_set_skip_taskbar(globalconf.L, -1, false);
 251             ewmh_client_update_hints(c);
 252         }
 253         else if(set == _NET_WM_STATE_ADD)
 254         {
 255             client_set_skip_taskbar(globalconf.L, -1, true);
 256             ewmh_client_update_hints(c);
 257         }
 258         else if(set == _NET_WM_STATE_TOGGLE)
 259         {
 260             client_set_skip_taskbar(globalconf.L, -1, !c->skip_taskbar);
 261             ewmh_client_update_hints(c);
 262         }
 263     }
 264     else if(state == _NET_WM_STATE_FULLSCREEN)
 265     {
 266         if(set == _NET_WM_STATE_REMOVE)
 267             client_set_fullscreen(globalconf.L, -1, false);
 268         else if(set == _NET_WM_STATE_ADD)
 269             client_set_fullscreen(globalconf.L, -1, true);
 270         else if(set == _NET_WM_STATE_TOGGLE)
 271             client_set_fullscreen(globalconf.L, -1, !c->fullscreen);
 272     }
 273     else if(state == _NET_WM_STATE_MAXIMIZED_HORZ)
 274     {
 275         if(set == _NET_WM_STATE_REMOVE)
 276             client_set_maximized_horizontal(globalconf.L, -1, false);
 277         else if(set == _NET_WM_STATE_ADD)
 278             client_set_maximized_horizontal(globalconf.L, -1, true);
 279         else if(set == _NET_WM_STATE_TOGGLE)
 280             client_set_maximized_horizontal(globalconf.L, -1, !c->maximized_horizontal);
 281     }
 282     else if(state == _NET_WM_STATE_MAXIMIZED_VERT)
 283     {
 284         if(set == _NET_WM_STATE_REMOVE)
 285             client_set_maximized_vertical(globalconf.L, -1, false);
 286         else if(set == _NET_WM_STATE_ADD)
 287             client_set_maximized_vertical(globalconf.L, -1, true);
 288         else if(set == _NET_WM_STATE_TOGGLE)
 289             client_set_maximized_vertical(globalconf.L, -1, !c->maximized_vertical);
 290     }
 291     else if(state == _NET_WM_STATE_ABOVE)
 292     {
 293         if(set == _NET_WM_STATE_REMOVE)
 294             client_set_above(globalconf.L, -1, false);
 295         else if(set == _NET_WM_STATE_ADD)
 296             client_set_above(globalconf.L, -1, true);
 297         else if(set == _NET_WM_STATE_TOGGLE)
 298             client_set_above(globalconf.L, -1, !c->above);
 299     }
 300     else if(state == _NET_WM_STATE_BELOW)
 301     {
 302         if(set == _NET_WM_STATE_REMOVE)
 303             client_set_below(globalconf.L, -1, false);
 304         else if(set == _NET_WM_STATE_ADD)
 305             client_set_below(globalconf.L, -1, true);
 306         else if(set == _NET_WM_STATE_TOGGLE)
 307             client_set_below(globalconf.L, -1, !c->below);
 308     }
 309     else if(state == _NET_WM_STATE_MODAL)
 310     {
 311         if(set == _NET_WM_STATE_REMOVE)
 312             client_set_modal(globalconf.L, -1, false);
 313         else if(set == _NET_WM_STATE_ADD)
 314             client_set_modal(globalconf.L, -1, true);
 315         else if(set == _NET_WM_STATE_TOGGLE)
 316             client_set_modal(globalconf.L, -1, !c->modal);
 317     }
 318     else if(state == _NET_WM_STATE_HIDDEN)
 319     {
 320         if(set == _NET_WM_STATE_REMOVE)
 321             client_set_minimized(globalconf.L, -1, false);
 322         else if(set == _NET_WM_STATE_ADD)
 323             client_set_minimized(globalconf.L, -1, true);
 324         else if(set == _NET_WM_STATE_TOGGLE)
 325             client_set_minimized(globalconf.L, -1, !c->minimized);
 326     }
 327     else if(state == _NET_WM_STATE_DEMANDS_ATTENTION)
 328     {
 329         if(set == _NET_WM_STATE_REMOVE)
 330             client_set_urgent(globalconf.L, -1, false);
 331         else if(set == _NET_WM_STATE_ADD)
 332             client_set_urgent(globalconf.L, -1, true);
 333         else if(set == _NET_WM_STATE_TOGGLE)
 334             client_set_urgent(globalconf.L, -1, !c->urgent);
 335     }
 336 }
 337
 338 int
 339 ewmh_process_client_message(xcb_client_message_event_t *ev)
 340 {
 341     client_t *c;
 342     int screen;
 343
 344     if(ev->type == _NET_CURRENT_DESKTOP)
 345         for(screen = 0;
 346             screen < xcb_setup_roots_length(xcb_get_setup(globalconf.connection));
 347             screen++)
 348         {
 349             if(ev->window == xutil_screen_get(globalconf.connection, screen)->root)
 350                 tag_view_only_byindex(&globalconf.screens.tab[screen], ev->data.data32[0]);
 351         }
 352     else if(ev->type == _NET_CLOSE_WINDOW)
 353     {
 354         if((c = client_getbywin(ev->window)))
 355            client_kill(c);
 356     }
 357     else if(ev->type == _NET_WM_DESKTOP)
 358     {
 359         if((c = client_getbywin(ev->window)))
 360         {
 361             tag_array_t *tags = &c->screen->tags;
 362
 363             if(ev->data.data32[0] == 0xffffffff)
 364                 c->sticky = true;
 365             else
 366                 for(int i = 0; i < tags->len; i++)
 367                     if((int)ev->data.data32[0] == i)
 368                     {
 369                         luaA_object_push(globalconf.L, tags->tab[i]);
 370                         tag_client(c);
 371                     }
 372                     else
 373                         untag_client(c, tags->tab[i]);
 374         }
 375     }
 376     else if(ev->type == _NET_WM_STATE)
 377     {
 378         if((c = client_getbywin(ev->window)))
 379         {
 380             ewmh_process_state_atom(c, (xcb_atom_t) ev->data.data32[1], ev->data.data32[0]);
 381             if(ev->data.data32[2])
 382                 ewmh_process_state_atom(c, (xcb_atom_t) ev->data.data32[2],
 383                                         ev->data.data32[0]);
 384         }
 385     }
 386     else if(ev->type == _NET_ACTIVE_WINDOW)
 387     {
 388         if((c = client_getbywin(ev->window)))
 389             client_focus(c);
 390     }
 391
 392     return 0;
 393 }
 394
 395 /** Update client EWMH hints.
 396  * \param c The client.
 397  */
 398 void
 399 ewmh_client_update_hints(client_t *c)
 400 {
 401     xcb_atom_t state[10]; /* number of defined state atoms */
 402     int i = 0;
 403
 404     if(c->modal)
 405         state[i++] = _NET_WM_STATE_MODAL;
 406     if(c->fullscreen)
 407         state[i++] = _NET_WM_STATE_FULLSCREEN;
 408     if(c->maximized_vertical)
 409         state[i++] = _NET_WM_STATE_MAXIMIZED_VERT;
 410     if(c->maximized_horizontal)
 411         state[i++] = _NET_WM_STATE_MAXIMIZED_HORZ;
 412     if(c->sticky)
 413         state[i++] = _NET_WM_STATE_STICKY;
 414     if(c->skip_taskbar)
 415         state[i++] = _NET_WM_STATE_SKIP_TASKBAR;
 416     if(c->above)
 417         state[i++] = _NET_WM_STATE_ABOVE;
 418     if(c->below)
 419         state[i++] = _NET_WM_STATE_BELOW;
 420     if(c->minimized)
 421         state[i++] = _NET_WM_STATE_HIDDEN;
 422     if(c->urgent)
 423         state[i++] = _NET_WM_STATE_DEMANDS_ATTENTION;
 424
 425     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 426                         c->window, _NET_WM_STATE, ATOM, 32, i, state);
 427 }
 428
 429 /** Update the client active desktop.
 430  * This is "wrong" since it can be on several tags, but EWMH has a strict view
 431  * of desktop system so just take the first tag.
 432  * \param c The client.
 433  */
 434 void
 435 ewmh_client_update_desktop(client_t *c)
 436 {
 437     int i;
 438     tag_array_t *tags = &c->screen->tags;
 439
 440     for(i = 0; i < tags->len; i++)
 441         if(is_client_tagged(c, tags->tab[i]))
 442         {
 443             xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 444                                 c->window, _NET_WM_DESKTOP, CARDINAL, 32, 1, &i);
 445             return;
 446         }
 447 }
 448
 449 /** Update the client struts.
 450  * \param window The window to update the struts for.
 451  * \param strut The strut type to update the window with.
 452  */
 453 void
 454 ewmh_update_strut(xcb_window_t window, strut_t *strut)
 455 {
 456     const uint32_t state[] =
 457     {
 458         strut->left,
 459         strut->right,
 460         strut->top,
 461         strut->bottom,
 462         strut->left_start_y,
 463         strut->left_end_y,
 464         strut->right_start_y,
 465         strut->right_end_y,
 466         strut->top_start_x,
 467         strut->top_end_x,
 468         strut->bottom_start_x,
 469         strut->bottom_end_x
 470     };
 471
 472     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 473                         window, _NET_WM_STRUT_PARTIAL, CARDINAL, 32, countof(state), state);
 474 }
 475
 476 void
 477 ewmh_client_check_hints(client_t *c)
 478 {
 479     xcb_atom_t *state;
 480     void *data = NULL;
 481     int desktop;
 482     xcb_get_property_cookie_t c0, c1, c2;
 483     xcb_get_property_reply_t *reply;
 484
 485     /* Send the GetProperty requests which will be processed later */
 486     c0 = xcb_get_property_unchecked(globalconf.connection, false, c->window,
 487                                     _NET_WM_DESKTOP, XCB_GET_PROPERTY_TYPE_ANY, 0, 1);
 488
 489     c1 = xcb_get_property_unchecked(globalconf.connection, false, c->window,
 490                                     _NET_WM_STATE, ATOM, 0, UINT32_MAX);
 491
 492     c2 = xcb_get_property_unchecked(globalconf.connection, false, c->window,
 493                                     _NET_WM_WINDOW_TYPE, ATOM, 0, UINT32_MAX);
 494
 495     reply = xcb_get_property_reply(globalconf.connection, c0, NULL);
 496     if(reply && reply->value_len && (data = xcb_get_property_value(reply)))
 497     {
 498         tag_array_t *tags = &c->screen->tags;
 499
 500         desktop = *(uint32_t *) data;
 501         if(desktop == -1)
 502             c->sticky = true;
 503         else
 504             for(int i = 0; i < tags->len; i++)
 505                 if(desktop == i)
 506                 {
 507                     luaA_object_push(globalconf.L, tags->tab[i]);
 508                     tag_client(c);
 509                 }
 510                 else
 511                     untag_client(c, tags->tab[i]);
 512     }
 513
 514     p_delete(&reply);
 515
 516     reply = xcb_get_property_reply(globalconf.connection, c1, NULL);
 517     if(reply && (data = xcb_get_property_value(reply)))
 518     {
 519         state = (xcb_atom_t *) data;
 520         for(int i = 0; i < xcb_get_property_value_length(reply) / ssizeof(xcb_atom_t); i++)
 521             ewmh_process_state_atom(c, state[i], _NET_WM_STATE_ADD);
 522     }
 523
 524     p_delete(&reply);
 525
 526     reply = xcb_get_property_reply(globalconf.connection, c2, NULL);
 527     if(reply && (data = xcb_get_property_value(reply)))
 528     {
 529         state = (xcb_atom_t *) data;
 530         for(int i = 0; i < xcb_get_property_value_length(reply) / ssizeof(xcb_atom_t); i++)
 531             if(state[i] == _NET_WM_WINDOW_TYPE_DESKTOP)
 532                 c->type = MAX(c->type, WINDOW_TYPE_DESKTOP);
 533             else if(state[i] == _NET_WM_WINDOW_TYPE_DIALOG)
 534                 c->type = MAX(c->type, WINDOW_TYPE_DIALOG);
 535             else if(state[i] == _NET_WM_WINDOW_TYPE_SPLASH)
 536                 c->type = MAX(c->type, WINDOW_TYPE_SPLASH);
 537             else if(state[i] == _NET_WM_WINDOW_TYPE_DOCK)
 538                 c->type = MAX(c->type, WINDOW_TYPE_DOCK);
 539             else if(state[i] == _NET_WM_WINDOW_TYPE_MENU)
 540                 c->type = MAX(c->type, WINDOW_TYPE_MENU);
 541             else if(state[i] == _NET_WM_WINDOW_TYPE_TOOLBAR)
 542                 c->type = MAX(c->type, WINDOW_TYPE_TOOLBAR);
 543             else if(state[i] == _NET_WM_WINDOW_TYPE_UTILITY)
 544                 c->type = MAX(c->type, WINDOW_TYPE_UTILITY);
 545     }
 546
 547     p_delete(&reply);
 548 }
 549
 550 /** Process the WM strut of a client.
 551  * \param c The client.
 552  * \param strut_r (Optional) An existing reply.
 553  */
 554 void
 555 ewmh_process_client_strut(client_t *c, xcb_get_property_reply_t *strut_r)
 556 {
 557     void *data;
 558     xcb_get_property_reply_t *mstrut_r = NULL;
 559
 560     if(!strut_r)
 561     {
 562         xcb_get_property_cookie_t strut_q = xcb_get_property_unchecked(globalconf.connection, false, c->window,
 563                                                                        _NET_WM_STRUT_PARTIAL, CARDINAL, 0, 12);
 564         strut_r = mstrut_r = xcb_get_property_reply(globalconf.connection, strut_q, NULL);
 565     }
 566
 567     if(strut_r
 568        && strut_r->value_len
 569        && (data = xcb_get_property_value(strut_r)))
 570     {
 571         uint32_t *strut = data;
 572
 573         if(c->strut.left != strut[0]
 574            || c->strut.right != strut[1]
 575            || c->strut.top != strut[2]
 576            || c->strut.bottom != strut[3]
 577            || c->strut.left_start_y != strut[4]
 578            || c->strut.left_end_y != strut[5]
 579            || c->strut.right_start_y != strut[6]
 580            || c->strut.right_end_y != strut[7]
 581            || c->strut.top_start_x != strut[8]
 582            || c->strut.top_end_x != strut[9]
 583            || c->strut.bottom_start_x != strut[10]
 584            || c->strut.bottom_end_x != strut[11])
 585         {
 586             c->strut.left = strut[0];
 587             c->strut.right = strut[1];
 588             c->strut.top = strut[2];
 589             c->strut.bottom = strut[3];
 590             c->strut.left_start_y = strut[4];
 591             c->strut.left_end_y = strut[5];
 592             c->strut.right_start_y = strut[6];
 593             c->strut.right_end_y = strut[7];
 594             c->strut.top_start_x = strut[8];
 595             c->strut.top_end_x = strut[9];
 596             c->strut.bottom_start_x = strut[10];
 597             c->strut.bottom_end_x = strut[11];
 598
 599             hook_property(c, "struts");
 600             luaA_object_push(globalconf.L, c);
 601             luaA_object_emit_signal(globalconf.L, -1, "property::struts", 0);
 602             lua_pop(globalconf.L, 1);
 603         }
 604     }
 605
 606     p_delete(&mstrut_r);
 607 }
 608
 609 /** Send request to get NET_WM_ICON (EWMH)
 610  * \param w The window.
 611  * \return The cookie associated with the request.
 612  */
 613 xcb_get_property_cookie_t
 614 ewmh_window_icon_get_unchecked(xcb_window_t w)
 615 {
 616   return xcb_get_property_unchecked(globalconf.connection, false, w,
 617                                     _NET_WM_ICON, CARDINAL, 0, UINT32_MAX);
 618 }
 619
 620 int
 621 ewmh_window_icon_from_reply(xcb_get_property_reply_t *r)
 622 {
 623     uint32_t *data;
 624     uint64_t len;
 625
 626     if(!r || r->type != CARDINAL || r->format != 32 || r->length < 2)
 627         return 0;
 628
 629     data = (uint32_t *) xcb_get_property_value(r);
 630     if (!data)
 631         return 0;
 632
 633     /* Check that the property is as long as it should be, handling integer
 634      * overflow. <uint32_t> times <another uint32_t casted to uint64_t> always
 635      * fits into an uint64_t and thus this multiplication cannot overflow.
 636      */
 637     len = data[0] * (uint64_t) data[1];
 638     if (!data[0] || !data[1] || len > r->length - 2)
 639         return 0;
 640
 641     return image_new_from_argb32(data[0], data[1], data + 2);
 642 }
 643
 644 /** Get NET_WM_ICON.
 645  * \param cookie The cookie.
 646  * \return The number of elements on stack.
 647  */
 648 int
 649 ewmh_window_icon_get_reply(xcb_get_property_cookie_t cookie)
 650 {
 651     xcb_get_property_reply_t *r = xcb_get_property_reply(globalconf.connection, cookie, NULL);
 652     int ret = ewmh_window_icon_from_reply(r);
 653     p_delete(&r);
 654     return ret;
 655 }
 656
 657 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80