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