vcs.maemo.org Git - monky/blob - src/x11.c

   1 /* Conky, a system monitor, based on torsmo
   2  *
   3  * Any original torsmo code is licensed under the BSD license
   4  *
   5  * All code written since the fork of torsmo is licensed under the GPL
   6  *
   7  * Please see COPYING for details
   8  *
   9  * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
  10  * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
  11  *      (see AUTHORS)
  12  * All rights reserved.
  13  *
  14  * This program is free software: you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation, either version 3 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25  *
  26  * vim: ts=4 sw=4 noet ai cindent syntax=c
  27  *
  28  */
  29
  30 #include "config.h"
  31 #include "conky.h"
  32 #include "logging.h"
  33 #include "common.h"
  34
  35 #include "x11.h"
  36 #include <X11/Xlib.h>
  37 #include <X11/Xatom.h>
  38 #include <X11/Xmd.h>
  39 #include <X11/Xutil.h>
  40 #ifdef IMLIB2
  41 #include "imlib2.h"
  42 #endif /* IMLIB2 */
  43
  44 #ifdef XFT
  45 #include <X11/Xft/Xft.h>
  46 int use_xft = 0;
  47 #endif
  48
  49 #ifdef HAVE_XDBE
  50 int use_xdbe;
  51 #endif
  52
  53 /* some basic X11 stuff */
  54 Display *display = NULL;
  55 int display_width;
  56 int display_height;
  57 int screen;
  58 static int set_transparent;
  59 static int background_colour;
  60
  61 /* workarea from _NET_WORKAREA, this is where window / text is aligned */
  62 int workarea[4];
  63
  64 /* Window stuff */
  65 struct conky_window window;
  66
  67 /* local prototypes */
  68 static void update_workarea(void);
  69 static Window find_desktop_window(Window *p_root, Window *p_desktop);
  70 static Window find_subwindow(Window win, int w, int h);
  71
  72 /* X11 initializer */
  73 void init_X11(const char *disp)
  74 {
  75         if (!display) {
  76                 if ((display = XOpenDisplay(disp)) == NULL) {
  77                         CRIT_ERR(NULL, NULL, "can't open display: %s", XDisplayName(0));
  78                 }
  79         }
  80
  81         screen = DefaultScreen(display);
  82         display_width = DisplayWidth(display, screen);
  83         display_height = DisplayHeight(display, screen);
  84
  85         get_x11_desktop_info(display, 0);
  86
  87         update_workarea();
  88 }
  89
  90 static void update_workarea(void)
  91 {
  92         /* default work area is display */
  93         workarea[0] = 0;
  94         workarea[1] = 0;
  95         workarea[2] = display_width;
  96         workarea[3] = display_height;
  97 }
  98
  99 /* Find root window and desktop window.
 100  * Return desktop window on success,
 101  * and set root and desktop byref return values.
 102  * Return 0 on failure. */
 103 static Window find_desktop_window(Window *p_root, Window *p_desktop)
 104 {
 105         Atom type;
 106         int format, i;
 107         unsigned long nitems, bytes;
 108         unsigned int n;
 109         Window root = RootWindow(display, screen);
 110         Window win = root;
 111         Window troot, parent, *children;
 112         unsigned char *buf = NULL;
 113
 114         if (!p_root || !p_desktop) {
 115                 return 0;
 116         }
 117
 118         /* some window managers set __SWM_VROOT to some child of root window */
 119
 120         XQueryTree(display, root, &troot, &parent, &children, &n);
 121         for (i = 0; i < (int) n; i++) {
 122                 if (XGetWindowProperty(display, children[i], ATOM(__SWM_VROOT), 0, 1,
 123                                 False, XA_WINDOW, &type, &format, &nitems, &bytes, &buf)
 124                                 == Success && type == XA_WINDOW) {
 125                         win = *(Window *) buf;
 126                         XFree(buf);
 127                         XFree(children);
 128                         fprintf(stderr,
 129                                 PACKAGE_NAME": desktop window (%lx) found from __SWM_VROOT property\n",
 130                                 win);
 131                         fflush(stderr);
 132                         *p_root = win;
 133                         *p_desktop = win;
 134                         return win;
 135                 }
 136
 137                 if (buf) {
 138                         XFree(buf);
 139                         buf = 0;
 140                 }
 141         }
 142         XFree(children);
 143
 144         /* get subwindows from root */
 145         win = find_subwindow(root, -1, -1);
 146
 147         update_workarea();
 148
 149         win = find_subwindow(win, workarea[2], workarea[3]);
 150
 151         if (buf) {
 152                 XFree(buf);
 153                 buf = 0;
 154         }
 155
 156         if (win != root) {
 157                 fprintf(stderr,
 158                         PACKAGE_NAME": desktop window (%lx) is subwindow of root window (%lx)\n",
 159                         win, root);
 160         } else {
 161                 fprintf(stderr, PACKAGE_NAME": desktop window (%lx) is root window\n", win);
 162         }
 163
 164         fflush(stderr);
 165
 166         *p_root = root;
 167         *p_desktop = win;
 168
 169         return win;
 170 }
 171
 172 /* sets background to ParentRelative for the Window and all parents */
 173 void set_transparent_background(Window win)
 174 {
 175         static int colour_set = -1;
 176
 177         if (set_transparent) {
 178                 Window parent = win;
 179                 unsigned int i;
 180
 181                 for (i = 0; i < 50 && parent != RootWindow(display, screen); i++) {
 182                         Window r, *children;
 183                         unsigned int n;
 184
 185                         XSetWindowBackgroundPixmap(display, parent, ParentRelative);
 186
 187                         XQueryTree(display, parent, &r, &parent, &children, &n);
 188                         XFree(children);
 189                 }
 190         } else if (colour_set != background_colour) {
 191                 XSetWindowBackground(display, win, background_colour);
 192                 colour_set = background_colour;
 193         }
 194         // XClearWindow(display, win); not sure why this was here
 195 }
 196
 197 void destroy_window(void)
 198 {
 199         if(window.xftdraw) {
 200                 XftDrawDestroy(window.xftdraw);
 201         }
 202         if(window.gc) {
 203                 XFreeGC(display, window.gc);
 204         }
 205         memset(&window, 0, sizeof(struct conky_window));
 206 }
 207
 208 void init_window(int own_window, int w, int h, int set_trans, int back_colour,
 209                 char **argv, int argc)
 210 {
 211         /* There seems to be some problems with setting transparent background
 212          * (on fluxbox this time). It doesn't happen always and I don't know why it
 213          * happens but I bet the bug is somewhere here. */
 214         set_transparent = set_trans;
 215         background_colour = back_colour;
 216
 217 #ifdef OWN_WINDOW
 218         if (own_window) {
 219                 if (!find_desktop_window(&window.root, &window.desktop)) {
 220                         return;
 221                 }
 222
 223                 if (window.type == TYPE_OVERRIDE) {
 224
 225                         /* An override_redirect True window.
 226                          * No WM hints or button processing needed. */
 227                         XSetWindowAttributes attrs = { ParentRelative, 0L, 0, 0L, 0, 0,
 228                                 Always, 0L, 0L, False, StructureNotifyMask | ExposureMask, 0L,
 229                                 True, 0, 0 };
 230
 231                         /* Parent is desktop window (which might be a child of root) */
 232                         window.window = XCreateWindow(display, window.desktop, window.x,
 233                                 window.y, w, h, 0, CopyFromParent, InputOutput, CopyFromParent,
 234                                 CWBackPixel | CWOverrideRedirect, &attrs);
 235
 236                         XLowerWindow(display, window.window);
 237
 238                         fprintf(stderr, PACKAGE_NAME": window type - override\n");
 239                         fflush(stderr);
 240                 } else { /* window.type != TYPE_OVERRIDE */
 241
 242                         /* A window managed by the window manager.
 243                          * Process hints and buttons. */
 244                         XSetWindowAttributes attrs = { ParentRelative, 0L, 0, 0L, 0, 0,
 245                                 Always, 0L, 0L, False, StructureNotifyMask | ExposureMask |
 246                                 ButtonPressMask | ButtonReleaseMask, 0L, False, 0, 0 };
 247
 248                         XClassHint classHint;
 249                         XWMHints wmHint;
 250                         Atom xa;
 251
 252                         if (window.type == TYPE_DOCK) {
 253                                 window.x = window.y = 0;
 254                         }
 255                         /* Parent is root window so WM can take control */
 256                         window.window = XCreateWindow(display, window.root, window.x,
 257                                 window.y, w, h, 0, CopyFromParent, InputOutput, CopyFromParent,
 258                                 CWBackPixel | CWOverrideRedirect, &attrs);
 259
 260                         classHint.res_name = window.class_name;
 261                         classHint.res_class = classHint.res_name;
 262
 263                         wmHint.flags = InputHint | StateHint;
 264                         /* allow decorated windows to be given input focus by WM */
 265                         wmHint.input =
 266                                 TEST_HINT(window.hints, HINT_UNDECORATED) ? False : True;
 267                         if (window.type == TYPE_DOCK || window.type == TYPE_PANEL) {
 268                                 wmHint.initial_state = WithdrawnState;
 269                         } else {
 270                                 wmHint.initial_state = NormalState;
 271                         }
 272
 273                         XmbSetWMProperties(display, window.window, window.title, NULL, argv,
 274                                 argc, NULL, &wmHint, &classHint);
 275
 276                         /* Sets an empty WM_PROTOCOLS property */
 277                         XSetWMProtocols(display, window.window, NULL, 0);
 278
 279                         /* Set window type */
 280                         if ((xa = ATOM(_NET_WM_WINDOW_TYPE)) != None) {
 281                                 Atom prop;
 282
 283                                 switch (window.type) {
 284                                         case TYPE_DESKTOP:
 285                                                 prop = ATOM(_NET_WM_WINDOW_TYPE_DESKTOP);
 286                                                 fprintf(stderr, PACKAGE_NAME": window type - desktop\n");
 287                                                 fflush(stderr);
 288                                                 break;
 289                                         case TYPE_DOCK:
 290                                                 prop = ATOM(_NET_WM_WINDOW_TYPE_DOCK);
 291                                                 fprintf(stderr, PACKAGE_NAME": window type - dock\n");
 292                                                 fflush(stderr);
 293                                                 break;
 294                                         case TYPE_PANEL:
 295                                                 prop = ATOM(_NET_WM_WINDOW_TYPE_DOCK);
 296                                                 fprintf(stderr, PACKAGE_NAME": window type - panel\n");
 297                                                 fflush(stderr);
 298                                                 break;
 299                                         case TYPE_NORMAL:
 300                                         default:
 301                                                 prop = ATOM(_NET_WM_WINDOW_TYPE_NORMAL);
 302                                                 fprintf(stderr, PACKAGE_NAME": window type - normal\n");
 303                                                 fflush(stderr);
 304                                                 break;
 305                                 }
 306                                 XChangeProperty(display, window.window, xa, XA_ATOM, 32,
 307                                         PropModeReplace, (unsigned char *) &prop, 1);
 308                         }
 309
 310                         /* Set desired hints */
 311
 312                         /* Window decorations */
 313                         if (TEST_HINT(window.hints, HINT_UNDECORATED)) {
 314                                 /* fprintf(stderr, PACKAGE_NAME": hint - undecorated\n");
 315                                 fflush(stderr); */
 316
 317                                 xa = ATOM(_MOTIF_WM_HINTS);
 318                                 if (xa != None) {
 319                                         long prop[5] = { 2, 0, 0, 0, 0 };
 320                                         XChangeProperty(display, window.window, xa, xa, 32,
 321                                                 PropModeReplace, (unsigned char *) prop, 5);
 322                                 }
 323                         }
 324
 325                         /* Below other windows */
 326                         if (TEST_HINT(window.hints, HINT_BELOW)) {
 327                                 /* fprintf(stderr, PACKAGE_NAME": hint - below\n");
 328                                 fflush(stderr); */
 329
 330                                 xa = ATOM(_WIN_LAYER);
 331                                 if (xa != None) {
 332                                         long prop = 0;
 333
 334                                         XChangeProperty(display, window.window, xa, XA_CARDINAL, 32,
 335                                                 PropModeAppend, (unsigned char *) &prop, 1);
 336                                 }
 337
 338                                 xa = ATOM(_NET_WM_STATE);
 339                                 if (xa != None) {
 340                                         Atom xa_prop = ATOM(_NET_WM_STATE_BELOW);
 341
 342                                         XChangeProperty(display, window.window, xa, XA_ATOM, 32,
 343                                                 PropModeAppend, (unsigned char *) &xa_prop, 1);
 344                                 }
 345                         }
 346
 347                         /* Above other windows */
 348                         if (TEST_HINT(window.hints, HINT_ABOVE)) {
 349                                 /* fprintf(stderr, PACKAGE_NAME": hint - above\n");
 350                                 fflush(stderr); */
 351
 352                                 xa = ATOM(_WIN_LAYER);
 353                                 if (xa != None) {
 354                                         long prop = 6;
 355
 356                                         XChangeProperty(display, window.window, xa, XA_CARDINAL, 32,
 357                                                 PropModeAppend, (unsigned char *) &prop, 1);
 358                                 }
 359
 360                                 xa = ATOM(_NET_WM_STATE);
 361                                 if (xa != None) {
 362                                         Atom xa_prop = ATOM(_NET_WM_STATE_ABOVE);
 363
 364                                         XChangeProperty(display, window.window, xa, XA_ATOM, 32,
 365                                                 PropModeAppend, (unsigned char *) &xa_prop, 1);
 366                                 }
 367                         }
 368
 369                         /* Sticky */
 370                         if (TEST_HINT(window.hints, HINT_STICKY)) {
 371                                 /* fprintf(stderr, PACKAGE_NAME": hint - sticky\n");
 372                                 fflush(stderr); */
 373
 374                                 xa = ATOM(_NET_WM_DESKTOP);
 375                                 if (xa != None) {
 376                                         CARD32 xa_prop = 0xFFFFFFFF;
 377
 378                                         XChangeProperty(display, window.window, xa, XA_CARDINAL, 32,
 379                                                 PropModeAppend, (unsigned char *) &xa_prop, 1);
 380                                 }
 381
 382                                 xa = ATOM(_NET_WM_STATE);
 383                                 if (xa != None) {
 384                                         Atom xa_prop = ATOM(_NET_WM_STATE_STICKY);
 385
 386                                         XChangeProperty(display, window.window, xa, XA_ATOM, 32,
 387                                                 PropModeAppend, (unsigned char *) &xa_prop, 1);
 388                                 }
 389                         }
 390
 391                         /* Skip taskbar */
 392                         if (TEST_HINT(window.hints, HINT_SKIP_TASKBAR)) {
 393                                 /* fprintf(stderr, PACKAGE_NAME": hint - skip_taskbar\n");
 394                                 fflush(stderr); */
 395
 396                                 xa = ATOM(_NET_WM_STATE);
 397                                 if (xa != None) {
 398                                         Atom xa_prop = ATOM(_NET_WM_STATE_SKIP_TASKBAR);
 399
 400                                         XChangeProperty(display, window.window, xa, XA_ATOM, 32,
 401                                                 PropModeAppend, (unsigned char *) &xa_prop, 1);
 402                                 }
 403                         }
 404
 405                         /* Skip pager */
 406                         if (TEST_HINT(window.hints, HINT_SKIP_PAGER)) {
 407                                 /* fprintf(stderr, PACKAGE_NAME": hint - skip_pager\n");
 408                                 fflush(stderr); */
 409
 410                                 xa = ATOM(_NET_WM_STATE);
 411                                 if (xa != None) {
 412                                         Atom xa_prop = ATOM(_NET_WM_STATE_SKIP_PAGER);
 413
 414                                         XChangeProperty(display, window.window, xa, XA_ATOM, 32,
 415                                                 PropModeAppend, (unsigned char *) &xa_prop, 1);
 416                                 }
 417                         }
 418                 } /* else { window.type != TYPE_OVERRIDE */
 419
 420                 fprintf(stderr, PACKAGE_NAME": drawing to created window (0x%lx)\n",
 421                         window.window);
 422                 fflush(stderr);
 423
 424                 XMapWindow(display, window.window);
 425
 426         } else /* if (own_window) { */
 427 #endif
 428                 /* root / desktop window */
 429         {
 430                 XWindowAttributes attrs;
 431
 432                 if (!window.window) {
 433                         window.window = find_desktop_window(&window.root, &window.desktop);
 434                 }
 435
 436                 if (XGetWindowAttributes(display, window.window, &attrs)) {
 437                         window.width = attrs.width;
 438                         window.height = attrs.height;
 439                 }
 440
 441                 fprintf(stderr, PACKAGE_NAME": drawing to desktop window\n");
 442         }
 443
 444         /* Drawable is same as window. This may be changed by double buffering. */
 445         window.drawable = window.window;
 446
 447 #ifdef HAVE_XDBE
 448         if (use_xdbe) {
 449                 int major, minor;
 450
 451                 if (!XdbeQueryExtension(display, &major, &minor)) {
 452                         use_xdbe = 0;
 453                 } else {
 454                         window.back_buffer = XdbeAllocateBackBufferName(display,
 455                                 window.window, XdbeBackground);
 456                         if (window.back_buffer != None) {
 457                                 window.drawable = window.back_buffer;
 458                                 fprintf(stderr, PACKAGE_NAME": drawing to double buffer\n");
 459                         } else {
 460                                 use_xdbe = 0;
 461                         }
 462                 }
 463                 if (!use_xdbe) {
 464                         ERR("failed to set up double buffer");
 465                 }
 466         }
 467         if (!use_xdbe) {
 468                 fprintf(stderr, PACKAGE_NAME": drawing to single buffer\n");
 469         }
 470 #endif
 471         window.visual = DefaultVisual(display, DefaultScreen(display));
 472         window.colourmap = DefaultColormap(display, DefaultScreen(display));
 473 #ifdef IMLIB2
 474         {
 475                 cimlib_init(display, window.drawable, window.visual, window.colourmap);
 476         }
 477 #endif /* IMLIB2 */
 478         XFlush(display);
 479
 480         /* set_transparent_background(window.window);
 481          * must be done after double buffer stuff? */
 482 #ifdef OWN_WINDOW
 483         /* if (own_window) {
 484                 set_transparent_background(window.window);
 485                 XClearWindow(display, window.window);
 486         } */
 487 #endif
 488
 489         XSelectInput(display, window.window, ExposureMask | PropertyChangeMask
 490 #ifdef OWN_WINDOW
 491                 | (own_window ? (StructureNotifyMask |
 492                 ButtonPressMask | ButtonReleaseMask) : 0)
 493 #endif
 494                 );
 495 }
 496
 497 static Window find_subwindow(Window win, int w, int h)
 498 {
 499         unsigned int i, j;
 500         Window troot, parent, *children;
 501         unsigned int n;
 502
 503         /* search subwindows with same size as display or work area */
 504
 505         for (i = 0; i < 10; i++) {
 506                 XQueryTree(display, win, &troot, &parent, &children, &n);
 507
 508                 for (j = 0; j < n; j++) {
 509                         XWindowAttributes attrs;
 510
 511                         if (XGetWindowAttributes(display, children[j], &attrs)) {
 512                                 /* Window must be mapped and same size as display or
 513                                  * work space */
 514                                 if (attrs.map_state != 0 && ((attrs.width == display_width
 515                                                 && attrs.height == display_height)
 516                                                 || (attrs.width == w && attrs.height == h))) {
 517                                         win = children[j];
 518                                         break;
 519                                 }
 520                         }
 521                 }
 522
 523                 XFree(children);
 524                 if (j == n) {
 525                         break;
 526                 }
 527         }
 528
 529         return win;
 530 }
 531
 532 long get_x11_color(const char *name)
 533 {
 534         XColor color;
 535
 536         color.pixel = 0;
 537         if (!XParseColor(display, DefaultColormap(display, screen), name, &color)) {
 538                 /* lets check if it's a hex colour with the # missing in front
 539                  * if yes, then do something about it */
 540                 char newname[DEFAULT_TEXT_BUFFER_SIZE];
 541
 542                 newname[0] = '#';
 543                 strncpy(&newname[1], name, DEFAULT_TEXT_BUFFER_SIZE - 1);
 544                 /* now lets try again */
 545                 if (!XParseColor(display, DefaultColormap(display, screen), &newname[0],
 546                                 &color)) {
 547                         ERR("can't parse X color '%s'", name);
 548                         return 0xFF00FF;
 549                 }
 550         }
 551         if (!XAllocColor(display, DefaultColormap(display, screen), &color)) {
 552                 ERR("can't allocate X color '%s'", name);
 553         }
 554
 555         return (long) color.pixel;
 556 }
 557
 558 void create_gc(void)
 559 {
 560         XGCValues values;
 561
 562         values.graphics_exposures = 0;
 563         values.function = GXcopy;
 564         window.gc = XCreateGC(display, window.drawable,
 565                 GCFunction | GCGraphicsExposures, &values);
 566 }
 567
 568 //Get current desktop number
 569 static inline void get_x11_desktop_current(Display *current_display, Window root, Atom atom)
 570 {
 571         Atom actual_type;
 572         int actual_format;
 573         unsigned long nitems;
 574         unsigned long bytes_after;
 575         unsigned char *prop = NULL;
 576         struct information *current_info = &info;
 577
 578         if ( (XGetWindowProperty( current_display, root, atom,
 579                                   0, 1L, False, XA_CARDINAL,
 580                                   &actual_type, &actual_format, &nitems,
 581                                   &bytes_after, &prop ) == Success ) &&
 582              (actual_type == XA_CARDINAL) &&
 583              (nitems == 1L) && (actual_format == 32) ) {
 584           current_info->x11.desktop.current = prop[0]+1;
 585         }
 586         if(prop) {
 587           XFree(prop);
 588         }
 589 }
 590
 591 //Get total number of available desktops
 592 static inline void get_x11_desktop_number(Display *current_display, Window root, Atom atom)
 593 {
 594         Atom actual_type;
 595         int actual_format;
 596         unsigned long nitems;
 597         unsigned long bytes_after;
 598         unsigned char *prop = NULL;
 599         struct information *current_info = &info;
 600
 601         if ( (XGetWindowProperty( current_display, root, atom,
 602                                   0, 1L, False, XA_CARDINAL,
 603                                   &actual_type, &actual_format, &nitems,
 604                                   &bytes_after, &prop ) == Success ) &&
 605              (actual_type == XA_CARDINAL) &&
 606              (nitems == 1L) && (actual_format == 32) ) {
 607           current_info->x11.desktop.number = prop[0];
 608         }
 609         if(prop) {
 610           XFree(prop);
 611         }
 612 }
 613
 614 //Get all desktop names
 615 static inline void get_x11_desktop_names(Display *current_display, Window root, Atom atom)
 616 {
 617         Atom actual_type;
 618         int actual_format;
 619         unsigned long nitems;
 620         unsigned long bytes_after;
 621         unsigned char *prop = NULL;
 622         struct information *current_info = &info;
 623
 624         if ( (XGetWindowProperty( current_display, root, atom,
 625                                   0, (~0L), False, ATOM(UTF8_STRING),
 626                                   &actual_type, &actual_format, &nitems,
 627                                   &bytes_after, &prop ) == Success ) &&
 628              (actual_type == ATOM(UTF8_STRING)) &&
 629              (nitems > 0L) && (actual_format == 8) ) {
 630
 631           if(current_info->x11.desktop.all_names) {
 632             free(current_info->x11.desktop.all_names);
 633             current_info->x11.desktop.all_names = NULL;
 634           }
 635           current_info->x11.desktop.all_names = malloc(nitems*sizeof(char));
 636           memcpy(current_info->x11.desktop.all_names, prop, nitems);
 637           current_info->x11.desktop.nitems = nitems;
 638         }
 639         if(prop) {
 640           XFree(prop);
 641         }
 642 }
 643
 644 //Get current desktop name
 645 static inline void get_x11_desktop_current_name(char *names)
 646 {
 647         struct information *current_info = &info;
 648         unsigned int i = 0, j = 0;
 649         int k = 0;
 650
 651         while ( i < current_info->x11.desktop.nitems ) {
 652           if ( names[i++] == '\0' ) {
 653             if ( ++k == current_info->x11.desktop.current ) {
 654               if (current_info->x11.desktop.name) {
 655                 free(current_info->x11.desktop.name);
 656                 current_info->x11.desktop.name = NULL;
 657               }
 658               current_info->x11.desktop.name = malloc((i-j)*sizeof(char));
 659               //desktop names can be empty but should always be not null
 660               strcpy( current_info->x11.desktop.name, (char *)&names[j] );
 661               break;
 662             }
 663             j = i;
 664           }
 665         }
 666 }
 667
 668 void get_x11_desktop_info(Display *current_display, Atom atom)
 669 {
 670         Window root;
 671         static Atom atom_current, atom_number, atom_names;
 672         struct information *current_info = &info;
 673         XWindowAttributes window_attributes;
 674
 675         root = RootWindow(current_display, current_info->x11.monitor.current);
 676
 677         //Check if we initialise else retrieve changed property
 678         if (atom == 0) {
 679           atom_current = XInternAtom(current_display, "_NET_CURRENT_DESKTOP", True);
 680           atom_number  = XInternAtom(current_display, "_NET_NUMBER_OF_DESKTOPS", True);
 681           atom_names   = XInternAtom(current_display, "_NET_DESKTOP_NAMES", True);
 682           get_x11_desktop_current(current_display, root, atom_current);
 683           get_x11_desktop_number(current_display, root, atom_number);
 684           get_x11_desktop_names(current_display, root, atom_names);
 685           get_x11_desktop_current_name(current_info->x11.desktop.all_names);
 686
 687           //Set the PropertyChangeMask on the root window, if not set
 688           XGetWindowAttributes(display, root, &window_attributes);
 689           if (!(window_attributes.your_event_mask & PropertyChangeMask)) {
 690             XSetWindowAttributes attributes;
 691             attributes.event_mask = window_attributes.your_event_mask | PropertyChangeMask;
 692             XChangeWindowAttributes(display, root, CWEventMask, &attributes);
 693             XGetWindowAttributes(display, root, &window_attributes);
 694           }
 695         } else {
 696           if (atom == atom_current) {
 697             get_x11_desktop_current(current_display, root, atom_current);
 698             get_x11_desktop_current_name(current_info->x11.desktop.all_names);
 699           } else if (atom == atom_number) {
 700             get_x11_desktop_number(current_display, root, atom_number);
 701           } else if (atom == atom_names) {
 702             get_x11_desktop_names(current_display, root, atom_names);
 703             get_x11_desktop_current_name(current_info->x11.desktop.all_names);
 704           }
 705         }
 706 }
 707
 708 void update_x11info(void)
 709 {
 710         struct information *current_info = &info;
 711         current_info->x11.monitor.number = XScreenCount(display);
 712         current_info->x11.monitor.current = XDefaultScreen(display);
 713 }
 714
 715 #ifdef OWN_WINDOW
 716 /* reserve window manager space */
 717 void set_struts(int sidenum)
 718 {
 719         Atom strut;
 720         if ((strut = ATOM(_NET_WM_STRUT)) != None) {
 721                 /* reserve space at left, right, top, bottom */
 722                 signed long sizes[12] = {0};
 723                 int i;
 724
 725                 /* define strut depth */
 726                 switch (sidenum) {
 727                         case 0:
 728                         {
 729                                 /* left side */
 730                                 sizes[0] = window.x + window.width;
 731                                 break;
 732                         }
 733                         case 1:
 734                         {
 735                                 /* right side */
 736                                 sizes[1] = display_width - window.x;
 737                                 break;
 738                         }
 739                         case 2:
 740                         {
 741                                 /* top side */
 742                                 sizes[2] = window.y + window.height;
 743                                 break;
 744                         }
 745                         case 3:
 746                         {
 747                                 /* bottom side */
 748                                 sizes[3] = display_height - window.y;
 749                                 break;
 750                         }
 751                 }
 752
 753                 /* define partial strut length */
 754                 if (sidenum <= 1) {
 755                         sizes[4 + (sidenum*2)] = window.y;
 756                         sizes[5 + (sidenum*2)] = window.y + window.height;
 757                 } else if (sidenum <= 3) {
 758                         sizes[4 + (sidenum*2)] = window.x;
 759                         sizes[5 + (sidenum*2)] = window.x + window.width;
 760                 }
 761
 762                 /* check constraints */
 763                 for (i = 0; i < 12; i++) {
 764                         if (sizes[i] < 0) {
 765                                 sizes[i] = 0;
 766                         } else {
 767                                 if (i <= 1 || i >= 8) {
 768                                         if (sizes[i] > display_width) {
 769                                                 sizes[i] = display_width;
 770                                         }
 771                                 } else {
 772                                         if (sizes[i] > display_height) {
 773                                                 sizes[i] = display_height;
 774                                         }
 775                                 }
 776                         }
 777                 }
 778
 779                 XChangeProperty(display, window.window, strut, XA_CARDINAL, 32,
 780                                 PropModeReplace, (unsigned char *) &sizes, 4);
 781
 782                 if ((strut = ATOM(_NET_WM_STRUT_PARTIAL)) != None) {
 783                         XChangeProperty(display, window.window, strut, XA_CARDINAL, 32,
 784                                         PropModeReplace, (unsigned char *) &sizes, 12);
 785                 }
 786         }
 787 }
 788 #endif /* OWN_WINDOW */