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   1 /*
   2  * i3bar - an xcb-based status- and ws-bar for i3
   3  *
   4  * © 2010-2011 Axel Wagner and contributors
   5  *
   6  * See file LICNSE for license information
   7  *
   8  * src/xcb.c: Communicating with X
   9  *
  10  */
  11 #include <xcb/xcb.h>
  12 #include <xcb/xproto.h>
  13 #include <xcb/xcb_atom.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include <fcntl.h>
  18 #include <string.h>
  19 #include <i3/ipc.h>
  20 #include <ev.h>
  21 #include <errno.h>
  22 #include <limits.h>
  23
  24 #include <X11/Xlib.h>
  25 #include <X11/XKBlib.h>
  26 #include <X11/extensions/XKB.h>
  27
  28 #include "common.h"
  29
  30 #if defined(__APPLE__)
  31
  32 /*
  33  * Taken from FreeBSD
  34  * Returns a pointer to a new string which is a duplicate of the
  35  * string, but only copies at most n characters.
  36  *
  37  */
  38 char *strndup(const char *str, size_t n) {
  39     size_t len;
  40     char *copy;
  41
  42     for (len = 0; len < n && str[len]; len++)
  43         continue;
  44
  45     if ((copy = malloc(len + 1)) == NULL)
  46         return (NULL);
  47     memcpy(copy, str, len);
  48     copy[len] = '\0';
  49     return (copy);
  50 }
  51
  52 #endif
  53
  54 /* We save the Atoms in an easy to access array, indexed by an enum */
  55 enum {
  56     #define ATOM_DO(name) name,
  57     #include "xcb_atoms.def"
  58     NUM_ATOMS
  59 };
  60
  61 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  62 xcb_atom_t               atoms[NUM_ATOMS];
  63
  64 /* Variables, that are the same for all functions at all times */
  65 xcb_connection_t *xcb_connection;
  66 int              screen;
  67 xcb_screen_t     *xcb_screen;
  68 xcb_window_t     xcb_root;
  69 xcb_font_t       xcb_font;
  70
  71 /* We need to cache some data to speed up text-width-prediction */
  72 xcb_query_font_reply_t *font_info;
  73 int                    font_height;
  74 xcb_charinfo_t         *font_table;
  75
  76 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  77 Display          *xkb_dpy;
  78 int              xkb_event_base;
  79 int              mod_pressed = 0;
  80
  81 /* Because the statusline is the same on all outputs, we have
  82  * global buffer to render it on */
  83 xcb_gcontext_t   statusline_ctx;
  84 xcb_gcontext_t   statusline_clear;
  85 xcb_pixmap_t     statusline_pm;
  86 uint32_t         statusline_width;
  87
  88 /* Event-Watchers, to interact with the user */
  89 ev_prepare *xcb_prep;
  90 ev_check   *xcb_chk;
  91 ev_io      *xcb_io;
  92 ev_io      *xkb_io;
  93
  94 /* The parsed colors */
  95 struct xcb_colors_t {
  96     uint32_t bar_fg;
  97     uint32_t bar_bg;
  98     uint32_t active_ws_fg;
  99     uint32_t active_ws_bg;
 100     uint32_t inactive_ws_fg;
 101     uint32_t inactive_ws_bg;
 102     uint32_t urgent_ws_bg;
 103     uint32_t urgent_ws_fg;
 104     uint32_t focus_ws_bg;
 105     uint32_t focus_ws_fg;
 106 };
 107 struct xcb_colors_t colors;
 108
 109 /* We define xcb_request_failed as a macro to include the relevant line-number */
 110 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
 111 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
 112     xcb_generic_error_t *err;
 113     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
 114         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
 115         return err->error_code;
 116     }
 117     return 0;
 118 }
 119
 120 /*
 121  * Predicts the length of text based on cached data.
 122  * The string has to be encoded in ucs2 and glyph_len has to be the length
 123  * of the string (in glyphs).
 124  *
 125  */
 126 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
 127     /* If we don't have per-character data, return the maximum width */
 128     if (font_table == NULL) {
 129         return (font_info->max_bounds.character_width * length);
 130     }
 131
 132     uint32_t width = 0;
 133     uint32_t i;
 134
 135     for (i = 0; i < length; i++) {
 136         xcb_charinfo_t *info;
 137         int row = text[i].byte1;
 138         int col = text[i].byte2;
 139
 140         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 141             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 142             continue;
 143         }
 144
 145         /* Don't you ask me, how this one works… */
 146         info = &font_table[((row - font_info->min_byte1) *
 147                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 148                            (col - font_info->min_char_or_byte2)];
 149
 150         if (info->character_width != 0 ||
 151             (info->right_side_bearing |
 152              info->left_side_bearing |
 153              info->ascent |
 154              info->descent) != 0) {
 155             width += info->character_width;
 156         }
 157     }
 158
 159     return width;
 160 }
 161
 162 /*
 163  * Draws text given in UCS-2-encoding to a given drawable and position
 164  *
 165  */
 166 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 167                xcb_char2b_t *text, uint32_t glyph_count) {
 168     int offset = 0;
 169     int16_t pos_x = x;
 170     int16_t font_ascent = font_info->font_ascent;
 171
 172     while (glyph_count > 0) {
 173         uint8_t chunk_size = MIN(255, glyph_count);
 174         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 175
 176         xcb_image_text_16(xcb_connection,
 177                           chunk_size,
 178                           drawable,
 179                           ctx,
 180                           pos_x, y + font_ascent,
 181                           text + offset);
 182
 183         offset += chunk_size;
 184         pos_x += chunk_width;
 185         glyph_count -= chunk_size;
 186     }
 187 }
 188
 189 /*
 190  * Converts a colorstring to a colorpixel as expected from xcb_change_gc.
 191  * s is assumed to be in the format "rrggbb"
 192  *
 193  */
 194 uint32_t get_colorpixel(const char *s) {
 195     char strings[3][3] = { { s[0], s[1], '\0'} ,
 196                            { s[2], s[3], '\0'} ,
 197                            { s[4], s[5], '\0'} };
 198     uint8_t r = strtol(strings[0], NULL, 16);
 199     uint8_t g = strtol(strings[1], NULL, 16);
 200     uint8_t b = strtol(strings[2], NULL, 16);
 201     return (r << 16 | g << 8 | b);
 202 }
 203
 204 /*
 205  * Redraws the statusline to the buffer
 206  *
 207  */
 208 void refresh_statusline() {
 209     int glyph_count;
 210
 211     if (statusline == NULL) {
 212         return;
 213     }
 214
 215     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 216     uint32_t old_statusline_width = statusline_width;
 217     statusline_width = predict_text_extents(text, glyph_count);
 218     /* If the statusline is bigger than our screen we need to make sure that
 219      * the pixmap provides enough space, so re-allocate if the width grew */
 220     if (statusline_width > xcb_screen->width_in_pixels &&
 221         statusline_width > old_statusline_width)
 222         realloc_sl_buffer();
 223
 224     xcb_rectangle_t rect = { 0, 0, xcb_screen->width_in_pixels, font_height };
 225     xcb_poly_fill_rectangle(xcb_connection, statusline_pm, statusline_clear, 1, &rect);
 226     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 227
 228     FREE(text);
 229 }
 230
 231 /*
 232  * Hides all bars (unmaps them)
 233  *
 234  */
 235 void hide_bars() {
 236     if (!config.hide_on_modifier) {
 237         return;
 238     }
 239
 240     i3_output *walk;
 241     SLIST_FOREACH(walk, outputs, slist) {
 242         if (!walk->active) {
 243             continue;
 244         }
 245         xcb_unmap_window(xcb_connection, walk->bar);
 246     }
 247     stop_child();
 248 }
 249
 250 /*
 251  * Unhides all bars (maps them)
 252  *
 253  */
 254 void unhide_bars() {
 255     if (!config.hide_on_modifier) {
 256         return;
 257     }
 258
 259     i3_output           *walk;
 260     xcb_void_cookie_t   cookie;
 261     uint32_t            mask;
 262     uint32_t            values[5];
 263
 264     cont_child();
 265
 266     SLIST_FOREACH(walk, outputs, slist) {
 267         if (walk->bar == XCB_NONE) {
 268             continue;
 269         }
 270         mask = XCB_CONFIG_WINDOW_X |
 271                XCB_CONFIG_WINDOW_Y |
 272                XCB_CONFIG_WINDOW_WIDTH |
 273                XCB_CONFIG_WINDOW_HEIGHT |
 274                XCB_CONFIG_WINDOW_STACK_MODE;
 275         values[0] = walk->rect.x;
 276         values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 277         values[2] = walk->rect.w;
 278         values[3] = font_height + 6;
 279         values[4] = XCB_STACK_MODE_ABOVE;
 280         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 281         cookie = xcb_configure_window_checked(xcb_connection,
 282                                               walk->bar,
 283                                               mask,
 284                                               values);
 285
 286         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 287             exit(EXIT_FAILURE);
 288         }
 289         xcb_map_window(xcb_connection, walk->bar);
 290     }
 291 }
 292
 293 /*
 294  * Parse the colors into a format that we can use
 295  *
 296  */
 297 void init_colors(const struct xcb_color_strings_t *new_colors) {
 298 #define PARSE_COLOR(name, def) \
 299     do { \
 300         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 301     } while  (0)
 302     PARSE_COLOR(bar_fg, "FFFFFF");
 303     PARSE_COLOR(bar_bg, "000000");
 304     PARSE_COLOR(active_ws_fg, "FFFFFF");
 305     PARSE_COLOR(active_ws_bg, "480000");
 306     PARSE_COLOR(inactive_ws_fg, "FFFFFF");
 307     PARSE_COLOR(inactive_ws_bg, "240000");
 308     PARSE_COLOR(urgent_ws_fg, "FFFFFF");
 309     PARSE_COLOR(urgent_ws_bg, "002400");
 310     PARSE_COLOR(focus_ws_fg, "FFFFFF");
 311     PARSE_COLOR(focus_ws_bg, "480000");
 312 #undef PARSE_COLOR
 313 }
 314
 315 /*
 316  * Handle a button-press-event (i.e. a mouse click on one of our bars).
 317  * We determine, whether the click occured on a ws-button or if the scroll-
 318  * wheel was used and change the workspace appropriately
 319  *
 320  */
 321 void handle_button(xcb_button_press_event_t *event) {
 322     i3_ws *cur_ws;
 323
 324     /* Determine, which bar was clicked */
 325     i3_output *walk;
 326     xcb_window_t bar = event->event;
 327     SLIST_FOREACH(walk, outputs, slist) {
 328         if (walk->bar == bar) {
 329             break;
 330         }
 331     }
 332
 333     if (walk == NULL) {
 334         DLOG("Unknown Bar klicked!\n");
 335         return;
 336     }
 337
 338     /* TODO: Move this to extern get_ws_for_output() */
 339     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 340         if (cur_ws->visible) {
 341             break;
 342         }
 343     }
 344
 345     if (cur_ws == NULL) {
 346         DLOG("No Workspace active?\n");
 347         return;
 348     }
 349
 350     int32_t x = event->event_x;
 351
 352     DLOG("Got Button %d\n", event->detail);
 353
 354     switch (event->detail) {
 355         case 1:
 356             /* Left Mousbutton. We determine, which button was clicked
 357              * and set cur_ws accordingly */
 358             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 359                 DLOG("x = %d\n", x);
 360                 if (x < cur_ws->name_width + 10) {
 361                     break;
 362                 }
 363                 x -= cur_ws->name_width + 10;
 364             }
 365             if (cur_ws == NULL) {
 366                 return;
 367             }
 368             break;
 369         case 4:
 370             /* Mouse wheel down. We select the next ws */
 371             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 372                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 373             } else {
 374                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 375             }
 376             break;
 377         case 5:
 378             /* Mouse wheel up. We select the previos ws */
 379             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 380                 cur_ws = TAILQ_FIRST(walk->workspaces);
 381             } else {
 382                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 383             }
 384             break;
 385     }
 386
 387     const size_t len = strlen(cur_ws->name) + strlen("workspace \"\"") + 1;
 388     char buffer[len];
 389     snprintf(buffer, len, "workspace \"%s\"", cur_ws->name);
 390     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 391 }
 392
 393 /*
 394  * Configures the x coordinate of all trayclients. To be called after adding a
 395  * new tray client or removing an old one.
 396  *
 397  */
 398 static void configure_trayclients() {
 399     trayclient *trayclient;
 400     i3_output *output;
 401     SLIST_FOREACH(output, outputs, slist) {
 402         if (!output->active)
 403             continue;
 404
 405         int clients = 0;
 406         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 407             clients++;
 408
 409             DLOG("Configuring tray window %08x to x=%d\n",
 410                  trayclient->win, output->rect.w - (clients * (font_height + 2)));
 411             uint32_t x = output->rect.w - (clients * (font_height + 2));
 412             xcb_configure_window(xcb_connection,
 413                                  trayclient->win,
 414                                  XCB_CONFIG_WINDOW_X,
 415                                  &x);
 416         }
 417     }
 418 }
 419
 420 /*
 421  * Handles ClientMessages (messages sent from another client directly to us).
 422  *
 423  * At the moment, only the tray window will receive client messages. All
 424  * supported client messages currently are _NET_SYSTEM_TRAY_OPCODE.
 425  *
 426  */
 427 static void handle_client_message(xcb_client_message_event_t* event) {
 428     if (event->type == atoms[_NET_SYSTEM_TRAY_OPCODE] &&
 429         event->format == 32) {
 430         DLOG("_NET_SYSTEM_TRAY_OPCODE received\n");
 431         /* event->data.data32[0] is the timestamp */
 432         uint32_t op = event->data.data32[1];
 433         uint32_t mask;
 434         uint32_t values[2];
 435         if (op == SYSTEM_TRAY_REQUEST_DOCK) {
 436             xcb_window_t client = event->data.data32[2];
 437
 438             /* Listen for PropertyNotify events to get the most recent value of
 439              * the XEMBED_MAPPED atom, also listen for UnmapNotify events */
 440             mask = XCB_CW_EVENT_MASK;
 441             values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
 442                         XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 443             xcb_change_window_attributes(xcb_connection,
 444                                          client,
 445                                          mask,
 446                                          values);
 447
 448             /* Request the _XEMBED_INFO property. The XEMBED specification
 449              * (which is referred by the tray specification) says this *has* to
 450              * be set, but VLC does not set it… */
 451             bool map_it = true;
 452             int xe_version = 1;
 453             xcb_get_property_cookie_t xembedc;
 454             xembedc = xcb_get_property_unchecked(xcb_connection,
 455                                                  0,
 456                                                  client,
 457                                                  atoms[_XEMBED_INFO],
 458                                                  XCB_GET_PROPERTY_TYPE_ANY,
 459                                                  0,
 460                                                  2 * 32);
 461
 462             xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 463                                                                        xembedc,
 464                                                                        NULL);
 465             if (xembedr != NULL && xembedr->length != 0) {
 466                 DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 467                 uint32_t *xembed = xcb_get_property_value(xembedr);
 468                 DLOG("xembed version = %d\n", xembed[0]);
 469                 DLOG("xembed flags = %d\n", xembed[1]);
 470                 map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 471                 xe_version = xembed[0];
 472                 if (xe_version > 1)
 473                     xe_version = 1;
 474                 free(xembedr);
 475             } else {
 476                 ELOG("Window %08x violates the XEMBED protocol, _XEMBED_INFO not set\n", client);
 477             }
 478
 479             DLOG("X window %08x requested docking\n", client);
 480             i3_output *walk, *output = NULL;
 481             SLIST_FOREACH(walk, outputs, slist) {
 482                 if (!walk->active)
 483                     continue;
 484                 DLOG("using output %s\n", walk->name);
 485                 output = walk;
 486             }
 487             if (output == NULL) {
 488                 ELOG("No output found\n");
 489                 return;
 490             }
 491             xcb_reparent_window(xcb_connection,
 492                                 client,
 493                                 output->bar,
 494                                 output->rect.w - font_height - 2,
 495                                 2);
 496             /* We reconfigure the window to use a reasonable size. The systray
 497              * specification explicitly says:
 498              *   Tray icons may be assigned any size by the system tray, and
 499              *   should do their best to cope with any size effectively
 500              */
 501             mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
 502             values[0] = font_height;
 503             values[1] = font_height;
 504             xcb_configure_window(xcb_connection,
 505                                  client,
 506                                  mask,
 507                                  values);
 508
 509             /* send the XEMBED_EMBEDDED_NOTIFY message */
 510             void *event = calloc(32, 1);
 511             xcb_client_message_event_t *ev = event;
 512             ev->response_type = XCB_CLIENT_MESSAGE;
 513             ev->window = client;
 514             ev->type = atoms[_XEMBED];
 515             ev->format = 32;
 516             ev->data.data32[0] = XCB_CURRENT_TIME;
 517             ev->data.data32[1] = atoms[XEMBED_EMBEDDED_NOTIFY];
 518             ev->data.data32[2] = output->bar;
 519             ev->data.data32[3] = xe_version;
 520             xcb_send_event(xcb_connection,
 521                            0,
 522                            client,
 523                            XCB_EVENT_MASK_NO_EVENT,
 524                            (char*)ev);
 525             free(event);
 526
 527             if (map_it) {
 528                 DLOG("Mapping dock client\n");
 529                 xcb_map_window(xcb_connection, client);
 530             } else {
 531                 DLOG("Not mapping dock client yet\n");
 532             }
 533             trayclient *tc = malloc(sizeof(trayclient));
 534             tc->win = client;
 535             tc->mapped = map_it;
 536             tc->xe_version = xe_version;
 537             TAILQ_INSERT_TAIL(output->trayclients, tc, tailq);
 538
 539             /* Trigger an update to copy the statusline text to the appropriate
 540              * position */
 541             configure_trayclients();
 542             draw_bars();
 543         }
 544     }
 545 }
 546
 547 /*
 548  * Handles UnmapNotify events. These events happen when a tray window unmaps
 549  * itself. We then update our data structure
 550  *
 551  */
 552 static void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
 553     DLOG("UnmapNotify for window = %08x, event = %08x\n", event->window, event->event);
 554
 555     i3_output *walk;
 556     SLIST_FOREACH(walk, outputs, slist) {
 557         if (!walk->active)
 558             continue;
 559         DLOG("checking output %s\n", walk->name);
 560         trayclient *trayclient;
 561         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 562             if (trayclient->win != event->window)
 563                 continue;
 564
 565             DLOG("Removing tray client with window ID %08x\n", event->window);
 566             TAILQ_REMOVE(walk->trayclients, trayclient, tailq);
 567
 568             /* Trigger an update, we now have more space for the statusline */
 569             configure_trayclients();
 570             draw_bars();
 571             return;
 572         }
 573     }
 574 }
 575
 576 /*
 577  * Handle PropertyNotify messages. Currently only the _XEMBED_INFO property is
 578  * handled, which tells us whether a dock client should be mapped or unmapped.
 579  *
 580  */
 581 static void handle_property_notify(xcb_property_notify_event_t *event) {
 582     DLOG("PropertyNotify\n");
 583     if (event->atom == atoms[_XEMBED_INFO] &&
 584         event->state == XCB_PROPERTY_NEW_VALUE) {
 585         DLOG("xembed_info updated\n");
 586         trayclient *trayclient = NULL, *walk;
 587         i3_output *o_walk;
 588         SLIST_FOREACH(o_walk, outputs, slist) {
 589             if (!o_walk->active)
 590                 continue;
 591
 592             TAILQ_FOREACH(walk, o_walk->trayclients, tailq) {
 593                 if (walk->win != event->window)
 594                     continue;
 595                 trayclient = walk;
 596                 break;
 597             }
 598
 599             if (trayclient)
 600                 break;
 601         }
 602         if (!trayclient) {
 603             ELOG("PropertyNotify received for unknown window %08x\n",
 604                  event->window);
 605             return;
 606         }
 607         xcb_get_property_cookie_t xembedc;
 608         xembedc = xcb_get_property_unchecked(xcb_connection,
 609                                              0,
 610                                              trayclient->win,
 611                                              atoms[_XEMBED_INFO],
 612                                              XCB_GET_PROPERTY_TYPE_ANY,
 613                                              0,
 614                                              2 * 32);
 615
 616         xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 617                                                                    xembedc,
 618                                                                    NULL);
 619         if (xembedr == NULL || xembedr->length == 0)
 620             return;
 621
 622         DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 623         uint32_t *xembed = xcb_get_property_value(xembedr);
 624         DLOG("xembed version = %d\n", xembed[0]);
 625         DLOG("xembed flags = %d\n", xembed[1]);
 626         bool map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 627         DLOG("map-state now %d\n", map_it);
 628         if (trayclient->mapped && !map_it) {
 629             /* need to unmap the window */
 630             xcb_unmap_window(xcb_connection, trayclient->win);
 631             trayclient->mapped = map_it;
 632             draw_bars();
 633         } else if (!trayclient->mapped && map_it) {
 634             /* need to map the window */
 635             xcb_map_window(xcb_connection, trayclient->win);
 636             trayclient->mapped = map_it;
 637             draw_bars();
 638         }
 639         free(xembedr);
 640     }
 641 }
 642
 643 /*
 644  * This function is called immediately before the main loop locks. We flush xcb
 645  * then (and only then)
 646  *
 647  */
 648 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 649     xcb_flush(xcb_connection);
 650 }
 651
 652 /*
 653  * This function is called immediately after the main loop locks, so when one
 654  * of the watchers registered an event.
 655  * We check whether an X-Event arrived and handle it.
 656  *
 657  */
 658 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 659     xcb_generic_event_t *event;
 660     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 661         return;
 662     }
 663
 664     switch (event->response_type & ~0x80) {
 665         case XCB_EXPOSE:
 666             /* Expose-events happen, when the window needs to be redrawn */
 667             redraw_bars();
 668             break;
 669         case XCB_BUTTON_PRESS:
 670             /* Button-press-events are mouse-buttons clicked on one of our bars */
 671             handle_button((xcb_button_press_event_t*) event);
 672             break;
 673         case XCB_CLIENT_MESSAGE:
 674             /* Client messages are used for client-to-client communication, for
 675              * example system tray widgets talk to us directly via client messages. */
 676             handle_client_message((xcb_client_message_event_t*) event);
 677             break;
 678         case XCB_UNMAP_NOTIFY:
 679             /* UnmapNotifies are received when a tray window unmaps itself */
 680             handle_unmap_notify((xcb_unmap_notify_event_t*) event);
 681             break;
 682         case XCB_PROPERTY_NOTIFY:
 683             /* PropertyNotify */
 684             handle_property_notify((xcb_property_notify_event_t*) event);
 685             break;
 686     }
 687     FREE(event);
 688 }
 689
 690 /*
 691  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 692  * are triggered
 693  *
 694  */
 695 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 696 }
 697
 698 /*
 699  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 700  *
 701  */
 702 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 703     XkbEvent ev;
 704     int modstate = 0;
 705
 706     DLOG("Got XKB-Event!\n");
 707
 708     while (XPending(xkb_dpy)) {
 709         XNextEvent(xkb_dpy, (XEvent*)&ev);
 710
 711         if (ev.type != xkb_event_base) {
 712             ELOG("No Xkb-Event!\n");
 713             continue;
 714         }
 715
 716         if (ev.any.xkb_type != XkbStateNotify) {
 717             ELOG("No State Notify!\n");
 718             continue;
 719         }
 720
 721         unsigned int mods = ev.state.mods;
 722         modstate = mods & Mod4Mask;
 723     }
 724
 725     if (modstate != mod_pressed) {
 726         if (modstate == 0) {
 727             DLOG("Mod4 got released!\n");
 728             hide_bars();
 729         } else {
 730             DLOG("Mod4 got pressed!\n");
 731             unhide_bars();
 732         }
 733         mod_pressed = modstate;
 734     }
 735 }
 736
 737 /*
 738  * Initialize xcb and use the specified fontname for text-rendering
 739  *
 740  */
 741 char *init_xcb(char *fontname) {
 742     /* FIXME: xcb_connect leaks Memory */
 743     xcb_connection = xcb_connect(NULL, &screen);
 744     if (xcb_connection_has_error(xcb_connection)) {
 745         ELOG("Cannot open display\n");
 746         exit(EXIT_FAILURE);
 747     }
 748     DLOG("Connected to xcb\n");
 749
 750     /* We have to request the atoms we need */
 751     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 752     #include "xcb_atoms.def"
 753
 754     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 755     xcb_root = xcb_screen->root;
 756
 757     /* We load and allocate the font */
 758     xcb_font = xcb_generate_id(xcb_connection);
 759     xcb_void_cookie_t open_font_cookie;
 760     open_font_cookie = xcb_open_font_checked(xcb_connection,
 761                                              xcb_font,
 762                                              strlen(fontname),
 763                                              fontname);
 764
 765     /* We need to save info about the font, because we need the font's height and
 766      * information about the width of characters */
 767     xcb_query_font_cookie_t query_font_cookie;
 768     query_font_cookie = xcb_query_font(xcb_connection,
 769                                        xcb_font);
 770
 771     /* To grab modifiers without blocking other applications from receiving key-events
 772      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 773      * in xcb */
 774     if (config.hide_on_modifier) {
 775         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 776         xkb_major = XkbMajorVersion;
 777         xkb_minor = XkbMinorVersion;
 778
 779         xkb_dpy = XkbOpenDisplay(NULL,
 780                                  &xkb_event_base,
 781                                  &xkb_errbase,
 782                                  &xkb_major,
 783                                  &xkb_minor,
 784                                  &xkb_err);
 785
 786         if (xkb_dpy == NULL) {
 787             ELOG("No XKB!\n");
 788             exit(EXIT_FAILURE);
 789         }
 790
 791         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 792             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 793             exit(EXIT_FAILURE);
 794         }
 795
 796         int i1;
 797         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 798             ELOG("XKB not supported by X-server!\n");
 799             exit(EXIT_FAILURE);
 800         }
 801
 802         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 803             ELOG("Could not grab Key!\n");
 804             exit(EXIT_FAILURE);
 805         }
 806
 807         xkb_io = malloc(sizeof(ev_io));
 808         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 809         ev_io_start(main_loop, xkb_io);
 810         XFlush(xkb_dpy);
 811     }
 812
 813     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 814      * this way, we can choose to crop it */
 815     uint32_t mask = XCB_GC_FOREGROUND;
 816     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 817
 818     statusline_clear = xcb_generate_id(xcb_connection);
 819     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 820                                                                statusline_clear,
 821                                                                xcb_root,
 822                                                                mask,
 823                                                                vals);
 824
 825     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 826     vals[0] = colors.bar_fg;
 827     statusline_ctx = xcb_generate_id(xcb_connection);
 828     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 829                                                             statusline_ctx,
 830                                                             xcb_root,
 831                                                             mask,
 832                                                             vals);
 833
 834     statusline_pm = xcb_generate_id(xcb_connection);
 835     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 836                                                                xcb_screen->root_depth,
 837                                                                statusline_pm,
 838                                                                xcb_root,
 839                                                                xcb_screen->width_in_pixels,
 840                                                                xcb_screen->height_in_pixels);
 841
 842
 843     /* The various Watchers to communicate with xcb */
 844     xcb_io = malloc(sizeof(ev_io));
 845     xcb_prep = malloc(sizeof(ev_prepare));
 846     xcb_chk = malloc(sizeof(ev_check));
 847
 848     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 849     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 850     ev_check_init(xcb_chk, &xcb_chk_cb);
 851
 852     ev_io_start(main_loop, xcb_io);
 853     ev_prepare_start(main_loop, xcb_prep);
 854     ev_check_start(main_loop, xcb_chk);
 855
 856     /* Now we get the atoms and save them in a nice data structure */
 857     get_atoms();
 858
 859     xcb_get_property_cookie_t path_cookie;
 860     path_cookie = xcb_get_property_unchecked(xcb_connection,
 861                                    0,
 862                                    xcb_root,
 863                                    atoms[I3_SOCKET_PATH],
 864                                    XCB_GET_PROPERTY_TYPE_ANY,
 865                                    0, PATH_MAX);
 866
 867     /* We check, if i3 set its socket-path */
 868     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 869                                                                   path_cookie,
 870                                                                   NULL);
 871     char *path = NULL;
 872     if (path_reply) {
 873         int len = xcb_get_property_value_length(path_reply);
 874         if (len != 0) {
 875             path = strndup(xcb_get_property_value(path_reply), len);
 876         }
 877     }
 878
 879     /* Now we save the font-infos */
 880     font_info = xcb_query_font_reply(xcb_connection,
 881                                      query_font_cookie,
 882                                      NULL);
 883
 884     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 885         exit(EXIT_FAILURE);
 886     }
 887
 888     font_height = font_info->font_ascent + font_info->font_descent;
 889
 890     if (xcb_query_font_char_infos_length(font_info) == 0) {
 891         font_table = NULL;
 892     } else {
 893         font_table = xcb_query_font_char_infos(font_info);
 894     }
 895
 896     DLOG("Calculated Font-height: %d\n", font_height);
 897
 898     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 899         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 900         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 901         exit(EXIT_FAILURE);
 902     }
 903
 904     return path;
 905 }
 906
 907 /*
 908  * Initializes tray support by requesting the appropriate _NET_SYSTEM_TRAY atom
 909  * for the X11 display we are running on, then acquiring the selection for this
 910  * atom. Afterwards, tray clients will send ClientMessages to our window.
 911  *
 912  */
 913 void init_tray() {
 914     /* request the tray manager atom for the X11 display we are running on */
 915     char atomname[strlen("_NET_SYSTEM_TRAY_S") + 11];
 916     snprintf(atomname, strlen("_NET_SYSTEM_TRAY_S") + 11, "_NET_SYSTEM_TRAY_S%d", screen);
 917     xcb_intern_atom_cookie_t tray_cookie;
 918     xcb_intern_atom_reply_t *tray_reply;
 919     tray_cookie = xcb_intern_atom(xcb_connection, 0, strlen(atomname), atomname);
 920
 921     /* tray support: we need a window to own the selection */
 922     xcb_window_t selwin = xcb_generate_id(xcb_connection);
 923     uint32_t selmask = XCB_CW_OVERRIDE_REDIRECT;
 924     uint32_t selval[] = { 1 };
 925     xcb_create_window(xcb_connection,
 926                       xcb_screen->root_depth,
 927                       selwin,
 928                       xcb_root,
 929                       -1, -1,
 930                       1, 1,
 931                       1,
 932                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 933                       xcb_screen->root_visual,
 934                       selmask,
 935                       selval);
 936
 937     uint32_t orientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
 938     /* set the atoms */
 939     xcb_change_property(xcb_connection,
 940                         XCB_PROP_MODE_REPLACE,
 941                         selwin,
 942                         atoms[_NET_SYSTEM_TRAY_ORIENTATION],
 943                         XCB_ATOM_CARDINAL,
 944                         32,
 945                         1,
 946                         &orientation);
 947
 948     if (!(tray_reply = xcb_intern_atom_reply(xcb_connection, tray_cookie, NULL))) {
 949         ELOG("Could not get atom %s\n", atomname);
 950         exit(EXIT_FAILURE);
 951     }
 952
 953     xcb_set_selection_owner(xcb_connection,
 954                             selwin,
 955                             tray_reply->atom,
 956                             XCB_CURRENT_TIME);
 957
 958     /* Verify that we have the selection */
 959     xcb_get_selection_owner_cookie_t selcookie;
 960     xcb_get_selection_owner_reply_t *selreply;
 961
 962     selcookie = xcb_get_selection_owner(xcb_connection, tray_reply->atom);
 963     if (!(selreply = xcb_get_selection_owner_reply(xcb_connection, selcookie, NULL))) {
 964         ELOG("Could not get selection owner for %s\n", atomname);
 965         exit(EXIT_FAILURE);
 966     }
 967
 968     if (selreply->owner != selwin) {
 969         ELOG("Could not set the %s selection. " \
 970              "Maybe another tray is already running?\n", atomname);
 971         /* NOTE that this error is not fatal. We just can’t provide tray
 972          * functionality */
 973         free(selreply);
 974         return;
 975     }
 976
 977     /* Inform clients waiting for a new _NET_SYSTEM_TRAY that we are here */
 978     void *event = calloc(32, 1);
 979     xcb_client_message_event_t *ev = event;
 980     ev->response_type = XCB_CLIENT_MESSAGE;
 981     ev->window = xcb_root;
 982     ev->type = atoms[MANAGER];
 983     ev->format = 32;
 984     ev->data.data32[0] = XCB_CURRENT_TIME;
 985     ev->data.data32[1] = tray_reply->atom;
 986     ev->data.data32[2] = selwin;
 987     xcb_send_event(xcb_connection,
 988                    0,
 989                    xcb_root,
 990                    XCB_EVENT_MASK_STRUCTURE_NOTIFY,
 991                    (char*)ev);
 992     free(event);
 993     free(tray_reply);
 994 }
 995
 996 /*
 997  * Cleanup the xcb-stuff.
 998  * Called once, before the program terminates.
 999  *
1000  */
1001 void clean_xcb() {
1002     i3_output *o_walk;
1003     trayclient *trayclient;
1004     free_workspaces();
1005     SLIST_FOREACH(o_walk, outputs, slist) {
1006         TAILQ_FOREACH(trayclient, o_walk->trayclients, tailq) {
1007             /* Unmap, then reparent (to root) the tray client windows */
1008             xcb_unmap_window(xcb_connection, trayclient->win);
1009             xcb_reparent_window(xcb_connection,
1010                                 trayclient->win,
1011                                 xcb_root,
1012                                 0,
1013                                 0);
1014         }
1015         destroy_window(o_walk);
1016         FREE(o_walk->trayclients);
1017         FREE(o_walk->workspaces);
1018         FREE(o_walk->name);
1019     }
1020     FREE_SLIST(outputs, i3_output);
1021     FREE(outputs);
1022
1023     xcb_flush(xcb_connection);
1024     xcb_disconnect(xcb_connection);
1025
1026     ev_check_stop(main_loop, xcb_chk);
1027     ev_prepare_stop(main_loop, xcb_prep);
1028     ev_io_stop(main_loop, xcb_io);
1029
1030     FREE(xcb_chk);
1031     FREE(xcb_prep);
1032     FREE(xcb_io);
1033     FREE(font_info);
1034 }
1035
1036 /*
1037  * Get the earlier requested atoms and save them in the prepared data structure
1038  *
1039  */
1040 void get_atoms() {
1041     xcb_intern_atom_reply_t *reply;
1042     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
1043         if (reply == NULL) { \
1044             ELOG("Could not get atom %s\n", #name); \
1045             exit(EXIT_FAILURE); \
1046         } \
1047         atoms[name] = reply->atom; \
1048         free(reply);
1049
1050     #include "xcb_atoms.def"
1051     DLOG("Got Atoms\n");
1052 }
1053
1054 /*
1055  * Destroy the bar of the specified output
1056  *
1057  */
1058 void destroy_window(i3_output *output) {
1059     if (output == NULL) {
1060         return;
1061     }
1062     if (output->bar == XCB_NONE) {
1063         return;
1064     }
1065     xcb_destroy_window(xcb_connection, output->bar);
1066     output->bar = XCB_NONE;
1067 }
1068
1069 /*
1070  * Reallocate the statusline-buffer
1071  *
1072  */
1073 void realloc_sl_buffer() {
1074     DLOG("Re-allocating statusline-buffer, statusline_width = %d, xcb_screen->width_in_pixels = %d\n",
1075          statusline_width, xcb_screen->width_in_pixels);
1076     xcb_free_pixmap(xcb_connection, statusline_pm);
1077     statusline_pm = xcb_generate_id(xcb_connection);
1078     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1079                                                                xcb_screen->root_depth,
1080                                                                statusline_pm,
1081                                                                xcb_root,
1082                                                                MAX(xcb_screen->width_in_pixels, statusline_width),
1083                                                                xcb_screen->height_in_pixels);
1084
1085     uint32_t mask = XCB_GC_FOREGROUND;
1086     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
1087     xcb_free_gc(xcb_connection, statusline_clear);
1088     statusline_clear = xcb_generate_id(xcb_connection);
1089     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1090                                                                statusline_clear,
1091                                                                xcb_root,
1092                                                                mask,
1093                                                                vals);
1094
1095     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
1096     vals[0] = colors.bar_fg;
1097     statusline_ctx = xcb_generate_id(xcb_connection);
1098     xcb_free_gc(xcb_connection, statusline_ctx);
1099     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1100                                                             statusline_ctx,
1101                                                             xcb_root,
1102                                                             mask,
1103                                                             vals);
1104
1105     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
1106         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
1107         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
1108         exit(EXIT_FAILURE);
1109     }
1110
1111 }
1112
1113 /*
1114  * Reconfigure all bars and create new bars for recently activated outputs
1115  *
1116  */
1117 void reconfig_windows() {
1118     uint32_t mask;
1119     uint32_t values[5];
1120
1121     i3_output *walk;
1122     SLIST_FOREACH(walk, outputs, slist) {
1123         if (!walk->active) {
1124             /* If an output is not active, we destroy its bar */
1125             /* FIXME: Maybe we rather want to unmap? */
1126             DLOG("Destroying window for output %s\n", walk->name);
1127             destroy_window(walk);
1128             continue;
1129         }
1130         if (walk->bar == XCB_NONE) {
1131             DLOG("Creating Window for output %s\n", walk->name);
1132
1133             /* TODO: only call init_tray() if the tray is configured for this output */
1134             init_tray();
1135
1136             walk->bar = xcb_generate_id(xcb_connection);
1137             walk->buffer = xcb_generate_id(xcb_connection);
1138             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
1139             /* Black background */
1140             values[0] = colors.bar_bg;
1141             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
1142             values[1] = config.hide_on_modifier;
1143             /* The events we want to receive */
1144             values[2] = XCB_EVENT_MASK_EXPOSURE;
1145             if (!config.disable_ws) {
1146                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
1147             }
1148             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
1149                                                                      xcb_screen->root_depth,
1150                                                                      walk->bar,
1151                                                                      xcb_root,
1152                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
1153                                                                      walk->rect.w, font_height + 6,
1154                                                                      1,
1155                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
1156                                                                      xcb_screen->root_visual,
1157                                                                      mask,
1158                                                                      values);
1159
1160             /* The double-buffer we use to render stuff off-screen */
1161             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1162                                                                     xcb_screen->root_depth,
1163                                                                     walk->buffer,
1164                                                                     walk->bar,
1165                                                                     walk->rect.w,
1166                                                                     walk->rect.h);
1167
1168             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
1169              * this one */
1170             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
1171                                                                 XCB_PROP_MODE_REPLACE,
1172                                                                 walk->bar,
1173                                                                 atoms[_NET_WM_WINDOW_TYPE],
1174                                                                 XCB_ATOM_ATOM,
1175                                                                 32,
1176                                                                 1,
1177                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
1178
1179             /* We need to tell i3, where to reserve space for i3bar */
1180             /* left, right, top, bottom, left_start_y, left_end_y,
1181              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
1182              * bottom_end_x */
1183             /* A local struct to save the strut_partial property */
1184             struct {
1185                 uint32_t left;
1186                 uint32_t right;
1187                 uint32_t top;
1188                 uint32_t bottom;
1189                 uint32_t left_start_y;
1190                 uint32_t left_end_y;
1191                 uint32_t right_start_y;
1192                 uint32_t right_end_y;
1193                 uint32_t top_start_x;
1194                 uint32_t top_end_x;
1195                 uint32_t bottom_start_x;
1196                 uint32_t bottom_end_x;
1197             } __attribute__((__packed__)) strut_partial = {0,};
1198             switch (config.dockpos) {
1199                 case DOCKPOS_NONE:
1200                     break;
1201                 case DOCKPOS_TOP:
1202                     strut_partial.top = font_height + 6;
1203                     strut_partial.top_start_x = walk->rect.x;
1204                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
1205                     break;
1206                 case DOCKPOS_BOT:
1207                     strut_partial.bottom = font_height + 6;
1208                     strut_partial.bottom_start_x = walk->rect.x;
1209                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
1210                     break;
1211             }
1212             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
1213                                                                  XCB_PROP_MODE_REPLACE,
1214                                                                  walk->bar,
1215                                                                  atoms[_NET_WM_STRUT_PARTIAL],
1216                                                                  XCB_ATOM_CARDINAL,
1217                                                                  32,
1218                                                                  12,
1219                                                                  &strut_partial);
1220
1221             /* We also want a graphics-context for the bars (it defines the properties
1222              * with which we draw to them) */
1223             walk->bargc = xcb_generate_id(xcb_connection);
1224             mask = XCB_GC_FONT;
1225             values[0] = xcb_font;
1226             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
1227                                                                 walk->bargc,
1228                                                                 walk->bar,
1229                                                                 mask,
1230                                                                 values);
1231
1232             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
1233             xcb_void_cookie_t map_cookie;
1234             if (!config.hide_on_modifier) {
1235                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
1236             }
1237
1238             if (xcb_request_failed(win_cookie,   "Could not create window") ||
1239                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
1240                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
1241                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
1242                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
1243                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
1244                 exit(EXIT_FAILURE);
1245             }
1246         } else {
1247             /* We already have a bar, so we just reconfigure it */
1248             mask = XCB_CONFIG_WINDOW_X |
1249                    XCB_CONFIG_WINDOW_Y |
1250                    XCB_CONFIG_WINDOW_WIDTH |
1251                    XCB_CONFIG_WINDOW_HEIGHT |
1252                    XCB_CONFIG_WINDOW_STACK_MODE;
1253             values[0] = walk->rect.x;
1254             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
1255             values[2] = walk->rect.w;
1256             values[3] = font_height + 6;
1257             values[4] = XCB_STACK_MODE_ABOVE;
1258
1259             DLOG("Destroying buffer for output %s", walk->name);
1260             xcb_free_pixmap(xcb_connection, walk->buffer);
1261
1262             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
1263             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
1264                                                                         walk->bar,
1265                                                                         mask,
1266                                                                         values);
1267
1268             DLOG("Recreating buffer for output %s", walk->name);
1269             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1270                                                                     xcb_screen->root_depth,
1271                                                                     walk->buffer,
1272                                                                     walk->bar,
1273                                                                     walk->rect.w,
1274                                                                     walk->rect.h);
1275
1276             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
1277                 exit(EXIT_FAILURE);
1278             }
1279             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
1280                 exit(EXIT_FAILURE);
1281             }
1282         }
1283     }
1284 }
1285
1286 /*
1287  * Render the bars, with buttons and statusline
1288  *
1289  */
1290 void draw_bars() {
1291     DLOG("Drawing Bars...\n");
1292     int i = 0;
1293
1294     refresh_statusline();
1295
1296     i3_output *outputs_walk;
1297     SLIST_FOREACH(outputs_walk, outputs, slist) {
1298         if (!outputs_walk->active) {
1299             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
1300             continue;
1301         }
1302         if (outputs_walk->bar == XCB_NONE) {
1303             /* Oh shit, an active output without an own bar. Create it now! */
1304             reconfig_windows();
1305         }
1306         /* First things first: clear the backbuffer */
1307         uint32_t color = colors.bar_bg;
1308         xcb_change_gc(xcb_connection,
1309                       outputs_walk->bargc,
1310                       XCB_GC_FOREGROUND,
1311                       &color);
1312         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
1313         xcb_poly_fill_rectangle(xcb_connection,
1314                                 outputs_walk->buffer,
1315                                 outputs_walk->bargc,
1316                                 1,
1317                                 &rect);
1318
1319         if (statusline != NULL) {
1320             DLOG("Printing statusline!\n");
1321
1322             /* Luckily we already prepared a seperate pixmap containing the rendered
1323              * statusline, we just have to copy the relevant parts to the relevant
1324              * position */
1325             trayclient *trayclient;
1326             int traypx = 0;
1327             TAILQ_FOREACH(trayclient, outputs_walk->trayclients, tailq) {
1328                 if (!trayclient->mapped)
1329                     continue;
1330                 /* We assume the tray icons are quadratic (we use the font
1331                  * *height* as *width* of the icons) because we configured them
1332                  * like this. */
1333                 traypx += font_height;
1334             }
1335             /* Add 2px of padding if there are any tray icons */
1336             if (traypx > 0)
1337                 traypx += 2;
1338             xcb_copy_area(xcb_connection,
1339                           statusline_pm,
1340                           outputs_walk->buffer,
1341                           outputs_walk->bargc,
1342                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
1343                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - traypx - 4)), 3,
1344                           MIN(outputs_walk->rect.w - traypx - 4, statusline_width), font_height);
1345         }
1346
1347         if (config.disable_ws) {
1348             continue;
1349         }
1350
1351         i3_ws *ws_walk;
1352         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
1353             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
1354             uint32_t fg_color = colors.inactive_ws_fg;
1355             uint32_t bg_color = colors.inactive_ws_bg;
1356             if (ws_walk->visible) {
1357                 if (!ws_walk->focused) {
1358                     fg_color = colors.active_ws_fg;
1359                     bg_color = colors.active_ws_bg;
1360                 } else {
1361                     fg_color = colors.focus_ws_fg;
1362                     bg_color = colors.focus_ws_bg;
1363                 }
1364             }
1365             if (ws_walk->urgent) {
1366                 DLOG("WS %s is urgent!\n", ws_walk->name);
1367                 fg_color = colors.urgent_ws_fg;
1368                 bg_color = colors.urgent_ws_bg;
1369                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
1370                 unhide_bars();
1371             }
1372             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
1373             uint32_t vals[] = { bg_color, bg_color };
1374             xcb_change_gc(xcb_connection,
1375                           outputs_walk->bargc,
1376                           mask,
1377                           vals);
1378             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
1379             xcb_poly_fill_rectangle(xcb_connection,
1380                                     outputs_walk->buffer,
1381                                     outputs_walk->bargc,
1382                                     1,
1383                                     &rect);
1384             xcb_change_gc(xcb_connection,
1385                           outputs_walk->bargc,
1386                           XCB_GC_FOREGROUND,
1387                           &fg_color);
1388             xcb_image_text_16(xcb_connection,
1389                               ws_walk->name_glyphs,
1390                               outputs_walk->buffer,
1391                               outputs_walk->bargc,
1392                               i + 5, font_info->font_ascent + 2,
1393                               ws_walk->ucs2_name);
1394             i += 10 + ws_walk->name_width;
1395         }
1396
1397         i = 0;
1398     }
1399
1400     redraw_bars();
1401 }
1402
1403 /*
1404  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1405  *
1406  */
1407 void redraw_bars() {
1408     i3_output *outputs_walk;
1409     SLIST_FOREACH(outputs_walk, outputs, slist) {
1410         if (!outputs_walk->active) {
1411             continue;
1412         }
1413         xcb_copy_area(xcb_connection,
1414                       outputs_walk->buffer,
1415                       outputs_walk->bar,
1416                       outputs_walk->bargc,
1417                       0, 0,
1418                       0, 0,
1419                       outputs_walk->rect.w,
1420                       outputs_walk->rect.h);
1421         xcb_flush(xcb_connection);
1422     }
1423 }