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   1 /*
   2  * i3bar - an xcb-based status- and ws-bar for i3
   3  *
   4  * © 2010 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 <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <string.h>
  18 #include <i3/ipc.h>
  19 #include <ev.h>
  20 #include <errno.h>
  21
  22 #include <X11/Xlib.h>
  23 #include <X11/XKBlib.h>
  24 #include <X11/extensions/XKB.h>
  25
  26 #include "common.h"
  27
  28 /* We save the Atoms in an easy to access array, indexed by an enum */
  29 #define NUM_ATOMS 3
  30
  31 enum {
  32     #define ATOM_DO(name) name,
  33     #include "xcb_atoms.def"
  34 };
  35
  36 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  37 xcb_atom_t               atoms[NUM_ATOMS];
  38
  39 /* Variables, that are the same for all functions at all times */
  40 xcb_connection_t *xcb_connection;
  41 xcb_screen_t     *xcb_screen;
  42 xcb_window_t     xcb_root;
  43 xcb_font_t       xcb_font;
  44
  45 /* We need to cache some data to speed up text-width-prediction */
  46 xcb_query_font_reply_t *font_info;
  47 int                    font_height;
  48 xcb_charinfo_t         *font_table;
  49
  50 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  51 Display          *xkb_dpy;
  52 int              xkb_event_base;
  53 int              mod_pressed = 0;
  54
  55 /* Because the statusline is the same on all outputs, we have
  56  * global buffer to render it on */
  57 xcb_gcontext_t   statusline_ctx;
  58 xcb_pixmap_t     statusline_pm;
  59 uint32_t         statusline_width;
  60
  61 /* Event-Watchers, to interact with the user */
  62 ev_prepare *xcb_prep;
  63 ev_check   *xcb_chk;
  64 ev_io      *xcb_io;
  65 ev_io      *xkb_io;
  66
  67 /* The parsed colors */
  68 struct xcb_colors_t {
  69     uint32_t bar_fg;
  70     uint32_t bar_bg;
  71     uint32_t active_ws_fg;
  72     uint32_t active_ws_bg;
  73     uint32_t inactive_ws_fg;
  74     uint32_t inactive_ws_bg;
  75     uint32_t urgent_ws_bg;
  76     uint32_t urgent_ws_fg;
  77 };
  78 struct xcb_colors_t colors;
  79
  80 /* We define xcb_request_failed as a macro to include the relevant line-number */
  81 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
  82 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
  83     xcb_generic_error_t *err;
  84     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
  85         ELOG("%s. X Error Code: %d\n", err_msg, err->error_code);
  86         return err->error_code;
  87     }
  88     return 0;
  89 }
  90
  91 /*
  92  * Predicts the length of text based on cached data.
  93  * The string has to be encoded in ucs2 and glyph_len has to be the length
  94  * of the string (in glyphs).
  95  *
  96  */
  97 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
  98     /* If we don't have per-character data, return the maximum width */
  99     if (font_table == NULL) {
 100         return (font_info->max_bounds.character_width * length);
 101     }
 102
 103     uint32_t width = 0;
 104     uint32_t i;
 105
 106     for (i = 0; i < length; i++) {
 107         xcb_charinfo_t *info;
 108         int row = text[i].byte1;
 109         int col = text[i].byte2;
 110
 111         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 112             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 113             continue;
 114         }
 115
 116         /* Don't you ask me, how this one works… */
 117         info = &font_table[((row - font_info->min_byte1) *
 118                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 119                            (col - font_info->min_char_or_byte2)];
 120
 121         if (info->character_width != 0 ||
 122             (info->right_side_bearing |
 123              info->left_side_bearing |
 124              info->ascent |
 125              info->descent) != 0) {
 126             width += info->character_width;
 127         }
 128     }
 129
 130     return width;
 131 }
 132
 133 /*
 134  * Draws text given in UCS-2-encoding to a given drawable and position
 135  *
 136  */
 137 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 138                xcb_char2b_t *text, uint32_t glyph_count) {
 139     int offset = 0;
 140     int16_t pos_x = x;
 141     int16_t font_ascent = font_info->font_ascent;
 142
 143     while (glyph_count > 0) {
 144         uint8_t chunk_size = MIN(255, glyph_count);
 145         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 146
 147         xcb_image_text_16(xcb_connection,
 148                           chunk_size,
 149                           drawable,
 150                           ctx,
 151                           pos_x, y + font_ascent,
 152                           text + offset);
 153
 154         offset += chunk_size;
 155         pos_x += chunk_width;
 156         glyph_count -= chunk_size;
 157     }
 158 }
 159
 160 /*
 161  * Converts a colorstring to a colorpixel as expected from xcb_change_gc.
 162  * s is assumed to be in the format "rrggbb"
 163  *
 164  */
 165 uint32_t get_colorpixel(const char *s) {
 166     char strings[3][3] = { { s[0], s[1], '\0'} ,
 167                            { s[2], s[3], '\0'} ,
 168                            { s[4], s[5], '\0'} };
 169     uint8_t r = strtol(strings[0], NULL, 16);
 170     uint8_t g = strtol(strings[1], NULL, 16);
 171     uint8_t b = strtol(strings[2], NULL, 16);
 172     return (r << 16 | g << 8 | b);
 173 }
 174
 175 /*
 176  * Redraws the statusline to the buffer
 177  *
 178  */
 179 void refresh_statusline() {
 180     int glyph_count;
 181
 182     if (statusline == NULL) {
 183         return;
 184     }
 185
 186     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 187     statusline_width = predict_text_extents(text, glyph_count);
 188
 189     xcb_free_pixmap(xcb_connection, statusline_pm);
 190     statusline_pm = xcb_generate_id(xcb_connection);
 191     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 192                                                                xcb_screen->root_depth,
 193                                                                statusline_pm,
 194                                                                xcb_root,
 195                                                                statusline_width,
 196                                                                font_height);
 197
 198     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 199
 200     FREE(text);
 201
 202     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer")) {
 203         exit(EXIT_FAILURE);
 204     }
 205 }
 206
 207 /*
 208  * Hides all bars (unmaps them)
 209  *
 210  */
 211 void hide_bars() {
 212     if (!config.hide_on_modifier) {
 213         return;
 214     }
 215
 216     i3_output *walk;
 217     SLIST_FOREACH(walk, outputs, slist) {
 218         xcb_unmap_window(xcb_connection, walk->bar);
 219     }
 220     stop_child();
 221 }
 222
 223 /*
 224  * Unhides all bars (maps them)
 225  *
 226  */
 227 void unhide_bars() {
 228     if (!config.hide_on_modifier) {
 229         return;
 230     }
 231
 232     i3_output           *walk;
 233     xcb_void_cookie_t   cookie;
 234     uint32_t            mask;
 235     uint32_t            values[5];
 236
 237     cont_child();
 238
 239     SLIST_FOREACH(walk, outputs, slist) {
 240         if (walk->bar == XCB_NONE) {
 241             continue;
 242         }
 243         mask = XCB_CONFIG_WINDOW_X |
 244                XCB_CONFIG_WINDOW_Y |
 245                XCB_CONFIG_WINDOW_WIDTH |
 246                XCB_CONFIG_WINDOW_HEIGHT |
 247                XCB_CONFIG_WINDOW_STACK_MODE;
 248         values[0] = walk->rect.x;
 249         values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 250         values[2] = walk->rect.w;
 251         values[3] = font_height + 6;
 252         values[4] = XCB_STACK_MODE_ABOVE;
 253         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 254         cookie = xcb_configure_window_checked(xcb_connection,
 255                                               walk->bar,
 256                                               mask,
 257                                               values);
 258
 259         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 260             exit(EXIT_FAILURE);
 261         }
 262         xcb_map_window(xcb_connection, walk->bar);
 263     }
 264 }
 265
 266 /*
 267  * Parse the colors into a format that we can use
 268  *
 269  */
 270 void init_colors(const struct xcb_color_strings_t *new_colors) {
 271 #define PARSE_COLOR(name, def) \
 272     do { \
 273         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 274     } while  (0)
 275     PARSE_COLOR(bar_fg, "FFFFFF");
 276     PARSE_COLOR(bar_bg, "000000");
 277     PARSE_COLOR(active_ws_fg, "FFFFFF");
 278     PARSE_COLOR(active_ws_bg, "480000");
 279     PARSE_COLOR(inactive_ws_fg, "FFFFFF");
 280     PARSE_COLOR(inactive_ws_bg, "240000");
 281     PARSE_COLOR(urgent_ws_fg, "FFFFFF");
 282     PARSE_COLOR(urgent_ws_bg, "002400");
 283 #undef PARSE_COLOR
 284 }
 285
 286 /*
 287  * Handle a button-press-event (i.c. a mouse click on one of our bars).
 288  * We determine, wether the click occured on a ws-button or if the scroll-
 289  * wheel was used and change the workspace appropriately
 290  *
 291  */
 292 void handle_button(xcb_button_press_event_t *event) {
 293     i3_ws *cur_ws;
 294
 295     /* Determine, which bar was clicked */
 296     i3_output *walk;
 297     xcb_window_t bar = event->event;
 298     SLIST_FOREACH(walk, outputs, slist) {
 299         if (walk->bar == bar) {
 300             break;
 301         }
 302     }
 303
 304     if (walk == NULL) {
 305         DLOG("Unknown Bar klicked!\n");
 306         return;
 307     }
 308
 309     /* TODO: Move this to extern get_ws_for_output() */
 310     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 311         if (cur_ws->visible) {
 312             break;
 313         }
 314     }
 315
 316     if (cur_ws == NULL) {
 317         DLOG("No Workspace active?\n");
 318         return;
 319     }
 320
 321     int32_t x = event->event_x;
 322
 323     DLOG("Got Button %d\n", event->detail);
 324
 325     switch (event->detail) {
 326         case 1:
 327             /* Left Mousbutton. We determine, which button was clicked
 328              * and set cur_ws accordingly */
 329             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 330                 DLOG("x = %d\n", x);
 331                 if (x < cur_ws->name_width + 10) {
 332                     break;
 333                 }
 334                 x -= cur_ws->name_width + 10;
 335             }
 336             if (cur_ws == NULL) {
 337                 return;
 338             }
 339             break;
 340         case 4:
 341             /* Mouse wheel down. We select the next ws */
 342             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 343                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 344             } else {
 345                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 346             }
 347             break;
 348         case 5:
 349             /* Mouse wheel up. We select the previos ws */
 350             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 351                 cur_ws = TAILQ_FIRST(walk->workspaces);
 352             } else {
 353                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 354             }
 355             break;
 356     }
 357
 358     char buffer[50];
 359     snprintf(buffer, 50, "%d", cur_ws->num);
 360     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 361 }
 362
 363 /*
 364  * This function is called immediately bevor the main loop locks. We flush xcb
 365  * then (and only then)
 366  *
 367  */
 368 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revenst) {
 369     xcb_flush(xcb_connection);
 370 }
 371
 372 /*
 373  * This function is called immediately after the main loop locks, so when one
 374  * of the watchers registered an event.
 375  * We check wether an X-Event arrived and handle it.
 376  *
 377  */
 378 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 379     xcb_generic_event_t *event;
 380     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 381         return;
 382     }
 383
 384     switch (event->response_type & ~0x80) {
 385         case XCB_EXPOSE:
 386             /* Expose-events happen, when the window needs to be redrawn */
 387             redraw_bars();
 388             break;
 389         case XCB_BUTTON_PRESS:
 390             /* Button-press-events are mouse-buttons clicked on one of our bars */
 391             handle_button((xcb_button_press_event_t*) event);
 392             break;
 393     }
 394     FREE(event);
 395 }
 396
 397 /*
 398  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 399  * are triggered
 400  *
 401  */
 402 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 403 }
 404
 405 /*
 406  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 407  *
 408  */
 409 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 410     XkbEvent ev;
 411     int modstate = 0;
 412
 413     DLOG("Got XKB-Event!\n");
 414
 415     while (XPending(xkb_dpy)) {
 416         XNextEvent(xkb_dpy, (XEvent*)&ev);
 417
 418         if (ev.type != xkb_event_base) {
 419             ELOG("No Xkb-Event!\n");
 420             continue;
 421         }
 422
 423         if (ev.any.xkb_type != XkbStateNotify) {
 424             ELOG("No State Notify!\n");
 425             continue;
 426         }
 427
 428         unsigned int mods = ev.state.mods;
 429         modstate = mods & Mod4Mask;
 430     }
 431
 432     if (modstate != mod_pressed) {
 433         if (modstate == 0) {
 434             DLOG("Mod4 got released!\n");
 435             hide_bars();
 436         } else {
 437             DLOG("Mod4 got pressed!\n");
 438             unhide_bars();
 439         }
 440         mod_pressed = modstate;
 441     }
 442 }
 443
 444 /*
 445  * Initialize xcb and use the specified fontname for text-rendering
 446  *
 447  */
 448 void init_xcb(char *fontname) {
 449     /* FIXME: xcb_connect leaks Memory */
 450     xcb_connection = xcb_connect(NULL, NULL);
 451     if (xcb_connection_has_error(xcb_connection)) {
 452         ELOG("Cannot open display\n");
 453         exit(EXIT_FAILURE);
 454     }
 455     DLOG("Connected to xcb\n");
 456
 457     /* We have to request the atoms we need */
 458     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 459     #include "xcb_atoms.def"
 460
 461     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 462     xcb_root = xcb_screen->root;
 463
 464     /* We load and allocate the font */
 465     xcb_font = xcb_generate_id(xcb_connection);
 466     xcb_void_cookie_t open_font_cookie;
 467     open_font_cookie = xcb_open_font_checked(xcb_connection,
 468                                              xcb_font,
 469                                              strlen(fontname),
 470                                              fontname);
 471
 472     /* We need to save info about the font, because we need the fonts height and
 473      * information about the width of characters */
 474     xcb_query_font_cookie_t query_font_cookie;
 475     query_font_cookie = xcb_query_font(xcb_connection,
 476                                        xcb_font);
 477
 478     /* To grab modifiers without blocking other applications from receiving key-events
 479      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 480      * in xcb */
 481     if (config.hide_on_modifier) {
 482         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 483         xkb_major = XkbMajorVersion;
 484         xkb_minor = XkbMinorVersion;
 485
 486         xkb_dpy = XkbOpenDisplay(":0",
 487                                  &xkb_event_base,
 488                                  &xkb_errbase,
 489                                  &xkb_major,
 490                                  &xkb_minor,
 491                                  &xkb_err);
 492
 493         if (xkb_dpy == NULL) {
 494             ELOG("No XKB!\n");
 495             exit(EXIT_FAILURE);
 496         }
 497
 498         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 499             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 500             exit(EXIT_FAILURE);
 501         }
 502
 503         int i1;
 504         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 505             ELOG("XKB not supported by X-server!\n");
 506             exit(EXIT_FAILURE);
 507         }
 508
 509         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 510             ELOG("Could not grab Key!\n");
 511             exit(EXIT_FAILURE);
 512         }
 513
 514         xkb_io = malloc(sizeof(ev_io));
 515         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 516         ev_io_start(main_loop, xkb_io);
 517         XFlush(xkb_dpy);
 518     }
 519
 520     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 521      * this way, we can choose to crop it */
 522     statusline_ctx = xcb_generate_id(xcb_connection);
 523     uint32_t mask = XCB_GC_FOREGROUND |
 524                     XCB_GC_BACKGROUND |
 525                     XCB_GC_FONT;
 526     uint32_t vals[3] = { colors.bar_fg, colors.bar_bg, xcb_font };
 527
 528     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 529                                                             statusline_ctx,
 530                                                             xcb_root,
 531                                                             mask,
 532                                                             vals);
 533
 534     /* We only generate an id for the pixmap, because the width of it is dependent on the
 535      * input we get */
 536     statusline_pm = xcb_generate_id(xcb_connection);
 537
 538     /* The varios Watchers to communicate with xcb */
 539     xcb_io = malloc(sizeof(ev_io));
 540     xcb_prep = malloc(sizeof(ev_prepare));
 541     xcb_chk = malloc(sizeof(ev_check));
 542
 543     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 544     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 545     ev_check_init(xcb_chk, &xcb_chk_cb);
 546
 547     ev_io_start(main_loop, xcb_io);
 548     ev_prepare_start(main_loop, xcb_prep);
 549     ev_check_start(main_loop, xcb_chk);
 550
 551     /* Now we get the atoms and save them in a nice data-structure */
 552     get_atoms();
 553
 554     /* Now we save the font-infos */
 555     font_info = xcb_query_font_reply(xcb_connection,
 556                                      query_font_cookie,
 557                                      NULL);
 558
 559     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 560         exit(EXIT_FAILURE);
 561     }
 562
 563     font_height = font_info->font_ascent + font_info->font_descent;
 564
 565     if (xcb_query_font_char_infos_length(font_info) == 0) {
 566         font_table = NULL;
 567     } else {
 568         font_table = xcb_query_font_char_infos(font_info);
 569     }
 570
 571     DLOG("Calculated Font-height: %d\n", font_height);
 572
 573     if (xcb_request_failed(sl_ctx_cookie, "Could not create context for statusline")) {
 574         exit(EXIT_FAILURE);
 575     }
 576 }
 577
 578 /*
 579  * Cleanup the xcb-stuff.
 580  * Called once, before the program terminates.
 581  *
 582  */
 583 void clean_xcb() {
 584     i3_output *o_walk;
 585     free_workspaces();
 586     SLIST_FOREACH(o_walk, outputs, slist) {
 587         destroy_window(o_walk);
 588         FREE(o_walk->workspaces);
 589         FREE(o_walk->name);
 590     }
 591     FREE_SLIST(outputs, i3_output);
 592     FREE(outputs);
 593
 594     xcb_disconnect(xcb_connection);
 595
 596     ev_check_stop(main_loop, xcb_chk);
 597     ev_prepare_stop(main_loop, xcb_prep);
 598     ev_io_stop(main_loop, xcb_io);
 599
 600     FREE(xcb_chk);
 601     FREE(xcb_prep);
 602     FREE(xcb_io);
 603     FREE(font_info);
 604 }
 605
 606 /*
 607  * Get the earlier requested atoms and save them in the prepared data-structure
 608  *
 609  */
 610 void get_atoms() {
 611     xcb_intern_atom_reply_t *reply;
 612     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
 613         if (reply == NULL) { \
 614             ELOG("Could not get atom %s\n", #name); \
 615             exit(EXIT_FAILURE); \
 616         } \
 617         atoms[name] = reply->atom; \
 618         free(reply);
 619
 620     #include "xcb_atoms.def"
 621     DLOG("Got Atoms\n");
 622 }
 623
 624 /*
 625  * Destroy the bar of the specified output
 626  *
 627  */
 628 void destroy_window(i3_output *output) {
 629     if (output == NULL) {
 630         return;
 631     }
 632     if (output->bar == XCB_NONE) {
 633         return;
 634     }
 635     xcb_destroy_window(xcb_connection, output->bar);
 636     output->bar = XCB_NONE;
 637 }
 638
 639 /*
 640  * Reconfigure all bars and create new for newly activated outputs
 641  *
 642  */
 643 void reconfig_windows() {
 644     uint32_t mask;
 645     uint32_t values[5];
 646
 647     i3_output *walk;
 648     SLIST_FOREACH(walk, outputs, slist) {
 649         if (!walk->active) {
 650             /* If an output is not active, we destroy it's bar */
 651             /* FIXME: Maybe we rather want to unmap? */
 652             DLOG("Destroying window for output %s\n", walk->name);
 653             destroy_window(walk);
 654             continue;
 655         }
 656         if (walk->bar == XCB_NONE) {
 657             DLOG("Creating Window for output %s\n", walk->name);
 658
 659             walk->bar = xcb_generate_id(xcb_connection);
 660             walk->buffer = xcb_generate_id(xcb_connection);
 661             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 662             /* Black background */
 663             values[0] = colors.bar_bg;
 664             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
 665             values[1] = config.hide_on_modifier;
 666             /* The events we want to receive */
 667             values[2] = XCB_EVENT_MASK_EXPOSURE |
 668                         XCB_EVENT_MASK_BUTTON_PRESS;
 669             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
 670                                                                      xcb_screen->root_depth,
 671                                                                      walk->bar,
 672                                                                      xcb_root,
 673                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
 674                                                                      walk->rect.w, font_height + 6,
 675                                                                      1,
 676                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
 677                                                                      xcb_screen->root_visual,
 678                                                                      mask,
 679                                                                      values);
 680
 681             /* The double-buffer we use to render stuff off-screen */
 682             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 683                                                                     xcb_screen->root_depth,
 684                                                                     walk->buffer,
 685                                                                     walk->bar,
 686                                                                     walk->rect.w,
 687                                                                     walk->rect.h);
 688
 689             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
 690              * this one */
 691             xcb_void_cookie_t prop_cookie = xcb_change_property(xcb_connection,
 692                                                                 XCB_PROP_MODE_REPLACE,
 693                                                                 walk->bar,
 694                                                                 atoms[_NET_WM_WINDOW_TYPE],
 695                                                                 atoms[ATOM],
 696                                                                 32,
 697                                                                 1,
 698                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
 699
 700             /* We also want a graphics-context for the bars (it defines the properties
 701              * with which we draw to them) */
 702             walk->bargc = xcb_generate_id(xcb_connection);
 703             mask = XCB_GC_FONT;
 704             values[0] = xcb_font;
 705             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
 706                                                                 walk->bargc,
 707                                                                 walk->bar,
 708                                                                 mask,
 709                                                                 values);
 710
 711             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
 712             xcb_void_cookie_t map_cookie;
 713             if (!config.hide_on_modifier) {
 714                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
 715             }
 716
 717             if (xcb_request_failed(win_cookie,  "Could not create window") ||
 718                 xcb_request_failed(pm_cookie,   "Could not create pixmap") ||
 719                 xcb_request_failed(prop_cookie, "Could not set dock mode") ||
 720                 xcb_request_failed(gc_cookie,   "Could not create graphical context") ||
 721                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
 722                 exit(EXIT_FAILURE);
 723             }
 724         } else {
 725             /* We already have a bar, so we just reconfigure it */
 726             mask = XCB_CONFIG_WINDOW_X |
 727                    XCB_CONFIG_WINDOW_Y |
 728                    XCB_CONFIG_WINDOW_WIDTH |
 729                    XCB_CONFIG_WINDOW_HEIGHT |
 730                    XCB_CONFIG_WINDOW_STACK_MODE;
 731             values[0] = walk->rect.x;
 732             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 733             values[2] = walk->rect.w;
 734             values[3] = font_height + 6;
 735             values[4] = XCB_STACK_MODE_ABOVE;
 736
 737             DLOG("Destroying buffer for output %s", walk->name);
 738             xcb_free_pixmap(xcb_connection, walk->buffer);
 739
 740             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 741             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
 742                                                                         walk->bar,
 743                                                                         mask,
 744                                                                         values);
 745
 746             DLOG("Recreating buffer for output %s", walk->name);
 747             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 748                                                                     xcb_screen->root_depth,
 749                                                                     walk->buffer,
 750                                                                     walk->bar,
 751                                                                     walk->rect.w,
 752                                                                     walk->rect.h);
 753
 754             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
 755                 exit(EXIT_FAILURE);
 756             }
 757             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
 758                 exit(EXIT_FAILURE);
 759             }
 760         }
 761     }
 762 }
 763
 764 /*
 765  * Render the bars, with buttons and statusline
 766  *
 767  */
 768 void draw_bars() {
 769     DLOG("Drawing Bars...\n");
 770     int i = 0;
 771
 772     refresh_statusline();
 773
 774     i3_output *outputs_walk;
 775     SLIST_FOREACH(outputs_walk, outputs, slist) {
 776         if (!outputs_walk->active) {
 777             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
 778             continue;
 779         }
 780         if (outputs_walk->bar == XCB_NONE) {
 781             /* Oh shit, an active output without an own bar. Create it now! */
 782             reconfig_windows();
 783         }
 784         /* First things first: clear the backbuffer */
 785         uint32_t color = colors.bar_bg;
 786         xcb_change_gc(xcb_connection,
 787                       outputs_walk->bargc,
 788                       XCB_GC_FOREGROUND,
 789                       &color);
 790         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
 791         xcb_poly_fill_rectangle(xcb_connection,
 792                                 outputs_walk->buffer,
 793                                 outputs_walk->bargc,
 794                                 1,
 795                                 &rect);
 796
 797         if (statusline != NULL) {
 798             DLOG("Printing statusline!\n");
 799
 800             /* Luckily we already prepared a seperate pixmap containing the rendered
 801              * statusline, we just have to copy the relevant parts to the relevant
 802              * position */
 803             xcb_copy_area(xcb_connection,
 804                           statusline_pm,
 805                           outputs_walk->buffer,
 806                           outputs_walk->bargc,
 807                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
 808                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - 4)), 3,
 809                           MIN(outputs_walk->rect.w - 4, statusline_width), font_height);
 810         }
 811
 812         i3_ws *ws_walk;
 813         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
 814             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
 815             uint32_t fg_color = colors.inactive_ws_fg;
 816             uint32_t bg_color = colors.inactive_ws_bg;
 817             if (ws_walk->visible) {
 818                 fg_color = colors.active_ws_fg;
 819                 bg_color = colors.active_ws_bg;
 820             }
 821             if (ws_walk->urgent) {
 822                 DLOG("WS %s is urgent!\n", ws_walk->name);
 823                 fg_color = colors.urgent_ws_fg;
 824                 bg_color = colors.urgent_ws_bg;
 825                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
 826                 unhide_bars();
 827             }
 828             xcb_change_gc(xcb_connection,
 829                           outputs_walk->bargc,
 830                           XCB_GC_FOREGROUND,
 831                           &bg_color);
 832             xcb_change_gc(xcb_connection,
 833                           outputs_walk->bargc,
 834                           XCB_GC_BACKGROUND,
 835                           &bg_color);
 836             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
 837             xcb_poly_fill_rectangle(xcb_connection,
 838                                     outputs_walk->buffer,
 839                                     outputs_walk->bargc,
 840                                     1,
 841                                     &rect);
 842             xcb_change_gc(xcb_connection,
 843                           outputs_walk->bargc,
 844                           XCB_GC_FOREGROUND,
 845                           &fg_color);
 846             xcb_image_text_16(xcb_connection,
 847                               ws_walk->name_glyphs,
 848                               outputs_walk->buffer,
 849                               outputs_walk->bargc,
 850                               i + 5, font_info->font_ascent + 2,
 851                               ws_walk->ucs2_name);
 852             i += 10 + ws_walk->name_width;
 853         }
 854
 855         redraw_bars();
 856
 857         i = 0;
 858     }
 859 }
 860
 861 /*
 862  * Redraw the bars, i.e. simply copy the buffer to the barwindow
 863  *
 864  */
 865 void redraw_bars() {
 866     i3_output *outputs_walk;
 867     SLIST_FOREACH(outputs_walk, outputs, slist) {
 868         xcb_copy_area(xcb_connection,
 869                       outputs_walk->buffer,
 870                       outputs_walk->bar,
 871                       outputs_walk->bargc,
 872                       0, 0,
 873                       0, 0,
 874                       outputs_walk->rect.w,
 875                       outputs_walk->rect.h);
 876         xcb_flush(xcb_connection);
 877     }
 878 }