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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 xcb_screen_t     *xcb_screen;
  67 xcb_window_t     xcb_root;
  68 xcb_font_t       xcb_font;
  69
  70 /* We need to cache some data to speed up text-width-prediction */
  71 xcb_query_font_reply_t *font_info;
  72 int                    font_height;
  73 xcb_charinfo_t         *font_table;
  74
  75 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  76 Display          *xkb_dpy;
  77 int              xkb_event_base;
  78 int              mod_pressed = 0;
  79
  80 /* Because the statusline is the same on all outputs, we have
  81  * global buffer to render it on */
  82 xcb_gcontext_t   statusline_ctx;
  83 xcb_gcontext_t   statusline_clear;
  84 xcb_pixmap_t     statusline_pm;
  85 uint32_t         statusline_width;
  86
  87 /* Event-Watchers, to interact with the user */
  88 ev_prepare *xcb_prep;
  89 ev_check   *xcb_chk;
  90 ev_io      *xcb_io;
  91 ev_io      *xkb_io;
  92
  93 /* The parsed colors */
  94 struct xcb_colors_t {
  95     uint32_t bar_fg;
  96     uint32_t bar_bg;
  97     uint32_t active_ws_fg;
  98     uint32_t active_ws_bg;
  99     uint32_t inactive_ws_fg;
 100     uint32_t inactive_ws_bg;
 101     uint32_t urgent_ws_bg;
 102     uint32_t urgent_ws_fg;
 103     uint32_t focus_ws_bg;
 104     uint32_t focus_ws_fg;
 105 };
 106 struct xcb_colors_t colors;
 107
 108 /* We define xcb_request_failed as a macro to include the relevant line-number */
 109 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
 110 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
 111     xcb_generic_error_t *err;
 112     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
 113         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
 114         return err->error_code;
 115     }
 116     return 0;
 117 }
 118
 119 /*
 120  * Predicts the length of text based on cached data.
 121  * The string has to be encoded in ucs2 and glyph_len has to be the length
 122  * of the string (in glyphs).
 123  *
 124  */
 125 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
 126     /* If we don't have per-character data, return the maximum width */
 127     if (font_table == NULL) {
 128         return (font_info->max_bounds.character_width * length);
 129     }
 130
 131     uint32_t width = 0;
 132     uint32_t i;
 133
 134     for (i = 0; i < length; i++) {
 135         xcb_charinfo_t *info;
 136         int row = text[i].byte1;
 137         int col = text[i].byte2;
 138
 139         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 140             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 141             continue;
 142         }
 143
 144         /* Don't you ask me, how this one works… */
 145         info = &font_table[((row - font_info->min_byte1) *
 146                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 147                            (col - font_info->min_char_or_byte2)];
 148
 149         if (info->character_width != 0 ||
 150             (info->right_side_bearing |
 151              info->left_side_bearing |
 152              info->ascent |
 153              info->descent) != 0) {
 154             width += info->character_width;
 155         }
 156     }
 157
 158     return width;
 159 }
 160
 161 /*
 162  * Draws text given in UCS-2-encoding to a given drawable and position
 163  *
 164  */
 165 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 166                xcb_char2b_t *text, uint32_t glyph_count) {
 167     int offset = 0;
 168     int16_t pos_x = x;
 169     int16_t font_ascent = font_info->font_ascent;
 170
 171     while (glyph_count > 0) {
 172         uint8_t chunk_size = MIN(255, glyph_count);
 173         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 174
 175         xcb_image_text_16(xcb_connection,
 176                           chunk_size,
 177                           drawable,
 178                           ctx,
 179                           pos_x, y + font_ascent,
 180                           text + offset);
 181
 182         offset += chunk_size;
 183         pos_x += chunk_width;
 184         glyph_count -= chunk_size;
 185     }
 186 }
 187
 188 /*
 189  * Converts a colorstring to a colorpixel as expected from xcb_change_gc.
 190  * s is assumed to be in the format "rrggbb"
 191  *
 192  */
 193 uint32_t get_colorpixel(const char *s) {
 194     char strings[3][3] = { { s[0], s[1], '\0'} ,
 195                            { s[2], s[3], '\0'} ,
 196                            { s[4], s[5], '\0'} };
 197     uint8_t r = strtol(strings[0], NULL, 16);
 198     uint8_t g = strtol(strings[1], NULL, 16);
 199     uint8_t b = strtol(strings[2], NULL, 16);
 200     return (r << 16 | g << 8 | b);
 201 }
 202
 203 /*
 204  * Redraws the statusline to the buffer
 205  *
 206  */
 207 void refresh_statusline() {
 208     int glyph_count;
 209
 210     if (statusline == NULL) {
 211         return;
 212     }
 213
 214     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 215     uint32_t old_statusline_width = statusline_width;
 216     statusline_width = predict_text_extents(text, glyph_count);
 217     /* If the statusline is bigger than our screen we need to make sure that
 218      * the pixmap provides enough space, so re-allocate if the width grew */
 219     if (statusline_width > xcb_screen->width_in_pixels &&
 220         statusline_width > old_statusline_width)
 221         realloc_sl_buffer();
 222
 223     xcb_rectangle_t rect = { 0, 0, xcb_screen->width_in_pixels, font_height };
 224     xcb_poly_fill_rectangle(xcb_connection, statusline_pm, statusline_clear, 1, &rect);
 225     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 226
 227     FREE(text);
 228 }
 229
 230 /*
 231  * Hides all bars (unmaps them)
 232  *
 233  */
 234 void hide_bars() {
 235     if (!config.hide_on_modifier) {
 236         return;
 237     }
 238
 239     i3_output *walk;
 240     SLIST_FOREACH(walk, outputs, slist) {
 241         if (!walk->active) {
 242             continue;
 243         }
 244         xcb_unmap_window(xcb_connection, walk->bar);
 245     }
 246     stop_child();
 247 }
 248
 249 /*
 250  * Unhides all bars (maps them)
 251  *
 252  */
 253 void unhide_bars() {
 254     if (!config.hide_on_modifier) {
 255         return;
 256     }
 257
 258     i3_output           *walk;
 259     xcb_void_cookie_t   cookie;
 260     uint32_t            mask;
 261     uint32_t            values[5];
 262
 263     cont_child();
 264
 265     SLIST_FOREACH(walk, outputs, slist) {
 266         if (walk->bar == XCB_NONE) {
 267             continue;
 268         }
 269         mask = XCB_CONFIG_WINDOW_X |
 270                XCB_CONFIG_WINDOW_Y |
 271                XCB_CONFIG_WINDOW_WIDTH |
 272                XCB_CONFIG_WINDOW_HEIGHT |
 273                XCB_CONFIG_WINDOW_STACK_MODE;
 274         values[0] = walk->rect.x;
 275         values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 276         values[2] = walk->rect.w;
 277         values[3] = font_height + 6;
 278         values[4] = XCB_STACK_MODE_ABOVE;
 279         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 280         cookie = xcb_configure_window_checked(xcb_connection,
 281                                               walk->bar,
 282                                               mask,
 283                                               values);
 284
 285         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 286             exit(EXIT_FAILURE);
 287         }
 288         xcb_map_window(xcb_connection, walk->bar);
 289     }
 290 }
 291
 292 /*
 293  * Parse the colors into a format that we can use
 294  *
 295  */
 296 void init_colors(const struct xcb_color_strings_t *new_colors) {
 297 #define PARSE_COLOR(name, def) \
 298     do { \
 299         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 300     } while  (0)
 301     PARSE_COLOR(bar_fg, "FFFFFF");
 302     PARSE_COLOR(bar_bg, "000000");
 303     PARSE_COLOR(active_ws_fg, "FFFFFF");
 304     PARSE_COLOR(active_ws_bg, "480000");
 305     PARSE_COLOR(inactive_ws_fg, "FFFFFF");
 306     PARSE_COLOR(inactive_ws_bg, "240000");
 307     PARSE_COLOR(urgent_ws_fg, "FFFFFF");
 308     PARSE_COLOR(urgent_ws_bg, "002400");
 309     PARSE_COLOR(focus_ws_fg, "FFFFFF");
 310     PARSE_COLOR(focus_ws_bg, "480000");
 311 #undef PARSE_COLOR
 312 }
 313
 314 /*
 315  * Handle a button-press-event (i.e. a mouse click on one of our bars).
 316  * We determine, whether the click occured on a ws-button or if the scroll-
 317  * wheel was used and change the workspace appropriately
 318  *
 319  */
 320 void handle_button(xcb_button_press_event_t *event) {
 321     i3_ws *cur_ws;
 322
 323     /* Determine, which bar was clicked */
 324     i3_output *walk;
 325     xcb_window_t bar = event->event;
 326     SLIST_FOREACH(walk, outputs, slist) {
 327         if (walk->bar == bar) {
 328             break;
 329         }
 330     }
 331
 332     if (walk == NULL) {
 333         DLOG("Unknown Bar klicked!\n");
 334         return;
 335     }
 336
 337     /* TODO: Move this to extern get_ws_for_output() */
 338     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 339         if (cur_ws->visible) {
 340             break;
 341         }
 342     }
 343
 344     if (cur_ws == NULL) {
 345         DLOG("No Workspace active?\n");
 346         return;
 347     }
 348
 349     int32_t x = event->event_x;
 350
 351     DLOG("Got Button %d\n", event->detail);
 352
 353     switch (event->detail) {
 354         case 1:
 355             /* Left Mousbutton. We determine, which button was clicked
 356              * and set cur_ws accordingly */
 357             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 358                 DLOG("x = %d\n", x);
 359                 if (x < cur_ws->name_width + 10) {
 360                     break;
 361                 }
 362                 x -= cur_ws->name_width + 10;
 363             }
 364             if (cur_ws == NULL) {
 365                 return;
 366             }
 367             break;
 368         case 4:
 369             /* Mouse wheel down. We select the next ws */
 370             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 371                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 372             } else {
 373                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 374             }
 375             break;
 376         case 5:
 377             /* Mouse wheel up. We select the previos ws */
 378             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 379                 cur_ws = TAILQ_FIRST(walk->workspaces);
 380             } else {
 381                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 382             }
 383             break;
 384     }
 385
 386     const size_t len = strlen(cur_ws->name) + strlen("workspace \"\"") + 1;
 387     char buffer[len];
 388     snprintf(buffer, len, "workspace \"%s\"", cur_ws->name);
 389     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 390 }
 391
 392 /*
 393  * This function is called immediately before the main loop locks. We flush xcb
 394  * then (and only then)
 395  *
 396  */
 397 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 398     xcb_flush(xcb_connection);
 399 }
 400
 401 /*
 402  * This function is called immediately after the main loop locks, so when one
 403  * of the watchers registered an event.
 404  * We check whether an X-Event arrived and handle it.
 405  *
 406  */
 407 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 408     xcb_generic_event_t *event;
 409
 410     if (xcb_connection_has_error(xcb_connection)) {
 411         ELOG("X11 connection was closed unexpectedly - maybe your X server terminated / crashed?\n");
 412         exit(1);
 413     }
 414
 415     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 416         return;
 417     }
 418
 419     switch (event->response_type & ~0x80) {
 420         case XCB_EXPOSE:
 421             /* Expose-events happen, when the window needs to be redrawn */
 422             redraw_bars();
 423             break;
 424         case XCB_BUTTON_PRESS:
 425             /* Button-press-events are mouse-buttons clicked on one of our bars */
 426             handle_button((xcb_button_press_event_t*) event);
 427             break;
 428     }
 429     FREE(event);
 430 }
 431
 432 /*
 433  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 434  * are triggered
 435  *
 436  */
 437 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 438 }
 439
 440 /*
 441  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 442  *
 443  */
 444 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 445     XkbEvent ev;
 446     int modstate = 0;
 447
 448     DLOG("Got XKB-Event!\n");
 449
 450     while (XPending(xkb_dpy)) {
 451         XNextEvent(xkb_dpy, (XEvent*)&ev);
 452
 453         if (ev.type != xkb_event_base) {
 454             ELOG("No Xkb-Event!\n");
 455             continue;
 456         }
 457
 458         if (ev.any.xkb_type != XkbStateNotify) {
 459             ELOG("No State Notify!\n");
 460             continue;
 461         }
 462
 463         unsigned int mods = ev.state.mods;
 464         modstate = mods & Mod4Mask;
 465     }
 466
 467     if (modstate != mod_pressed) {
 468         if (modstate == 0) {
 469             DLOG("Mod4 got released!\n");
 470             hide_bars();
 471         } else {
 472             DLOG("Mod4 got pressed!\n");
 473             unhide_bars();
 474         }
 475         mod_pressed = modstate;
 476     }
 477 }
 478
 479 /*
 480  * Initialize xcb and use the specified fontname for text-rendering
 481  *
 482  */
 483 char *init_xcb(char *fontname) {
 484     /* FIXME: xcb_connect leaks Memory */
 485     xcb_connection = xcb_connect(NULL, NULL);
 486     if (xcb_connection_has_error(xcb_connection)) {
 487         ELOG("Cannot open display\n");
 488         exit(EXIT_FAILURE);
 489     }
 490     DLOG("Connected to xcb\n");
 491
 492     /* We have to request the atoms we need */
 493     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 494     #include "xcb_atoms.def"
 495
 496     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 497     xcb_root = xcb_screen->root;
 498
 499     /* We load and allocate the font */
 500     xcb_font = xcb_generate_id(xcb_connection);
 501     xcb_void_cookie_t open_font_cookie;
 502     open_font_cookie = xcb_open_font_checked(xcb_connection,
 503                                              xcb_font,
 504                                              strlen(fontname),
 505                                              fontname);
 506
 507     /* We need to save info about the font, because we need the font's height and
 508      * information about the width of characters */
 509     xcb_query_font_cookie_t query_font_cookie;
 510     query_font_cookie = xcb_query_font(xcb_connection,
 511                                        xcb_font);
 512
 513     /* To grab modifiers without blocking other applications from receiving key-events
 514      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 515      * in xcb */
 516     if (config.hide_on_modifier) {
 517         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 518         xkb_major = XkbMajorVersion;
 519         xkb_minor = XkbMinorVersion;
 520
 521         xkb_dpy = XkbOpenDisplay(NULL,
 522                                  &xkb_event_base,
 523                                  &xkb_errbase,
 524                                  &xkb_major,
 525                                  &xkb_minor,
 526                                  &xkb_err);
 527
 528         if (xkb_dpy == NULL) {
 529             ELOG("No XKB!\n");
 530             exit(EXIT_FAILURE);
 531         }
 532
 533         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 534             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 535             exit(EXIT_FAILURE);
 536         }
 537
 538         int i1;
 539         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 540             ELOG("XKB not supported by X-server!\n");
 541             exit(EXIT_FAILURE);
 542         }
 543
 544         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 545             ELOG("Could not grab Key!\n");
 546             exit(EXIT_FAILURE);
 547         }
 548
 549         xkb_io = malloc(sizeof(ev_io));
 550         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 551         ev_io_start(main_loop, xkb_io);
 552         XFlush(xkb_dpy);
 553     }
 554
 555     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 556      * this way, we can choose to crop it */
 557     uint32_t mask = XCB_GC_FOREGROUND;
 558     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 559
 560     statusline_clear = xcb_generate_id(xcb_connection);
 561     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 562                                                                statusline_clear,
 563                                                                xcb_root,
 564                                                                mask,
 565                                                                vals);
 566
 567     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 568     vals[0] = colors.bar_fg;
 569     statusline_ctx = xcb_generate_id(xcb_connection);
 570     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 571                                                             statusline_ctx,
 572                                                             xcb_root,
 573                                                             mask,
 574                                                             vals);
 575
 576     statusline_pm = xcb_generate_id(xcb_connection);
 577     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 578                                                                xcb_screen->root_depth,
 579                                                                statusline_pm,
 580                                                                xcb_root,
 581                                                                xcb_screen->width_in_pixels,
 582                                                                xcb_screen->height_in_pixels);
 583
 584
 585     /* The various Watchers to communicate with xcb */
 586     xcb_io = malloc(sizeof(ev_io));
 587     xcb_prep = malloc(sizeof(ev_prepare));
 588     xcb_chk = malloc(sizeof(ev_check));
 589
 590     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 591     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 592     ev_check_init(xcb_chk, &xcb_chk_cb);
 593
 594     ev_io_start(main_loop, xcb_io);
 595     ev_prepare_start(main_loop, xcb_prep);
 596     ev_check_start(main_loop, xcb_chk);
 597
 598     /* Now we get the atoms and save them in a nice data structure */
 599     get_atoms();
 600
 601     xcb_get_property_cookie_t path_cookie;
 602     path_cookie = xcb_get_property_unchecked(xcb_connection,
 603                                    0,
 604                                    xcb_root,
 605                                    atoms[I3_SOCKET_PATH],
 606                                    XCB_GET_PROPERTY_TYPE_ANY,
 607                                    0, PATH_MAX);
 608
 609     /* We check, if i3 set its socket-path */
 610     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 611                                                                   path_cookie,
 612                                                                   NULL);
 613     char *path = NULL;
 614     if (path_reply) {
 615         int len = xcb_get_property_value_length(path_reply);
 616         if (len != 0) {
 617             path = strndup(xcb_get_property_value(path_reply), len);
 618         }
 619     }
 620
 621     /* Now we save the font-infos */
 622     font_info = xcb_query_font_reply(xcb_connection,
 623                                      query_font_cookie,
 624                                      NULL);
 625
 626     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 627         exit(EXIT_FAILURE);
 628     }
 629
 630     font_height = font_info->font_ascent + font_info->font_descent;
 631
 632     if (xcb_query_font_char_infos_length(font_info) == 0) {
 633         font_table = NULL;
 634     } else {
 635         font_table = xcb_query_font_char_infos(font_info);
 636     }
 637
 638     DLOG("Calculated Font-height: %d\n", font_height);
 639
 640     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 641         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 642         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 643         exit(EXIT_FAILURE);
 644     }
 645
 646     return path;
 647 }
 648
 649 /*
 650  * Cleanup the xcb-stuff.
 651  * Called once, before the program terminates.
 652  *
 653  */
 654 void clean_xcb() {
 655     i3_output *o_walk;
 656     free_workspaces();
 657     SLIST_FOREACH(o_walk, outputs, slist) {
 658         destroy_window(o_walk);
 659         FREE(o_walk->workspaces);
 660         FREE(o_walk->name);
 661     }
 662     FREE_SLIST(outputs, i3_output);
 663     FREE(outputs);
 664
 665     xcb_disconnect(xcb_connection);
 666
 667     ev_check_stop(main_loop, xcb_chk);
 668     ev_prepare_stop(main_loop, xcb_prep);
 669     ev_io_stop(main_loop, xcb_io);
 670
 671     FREE(xcb_chk);
 672     FREE(xcb_prep);
 673     FREE(xcb_io);
 674     FREE(font_info);
 675 }
 676
 677 /*
 678  * Get the earlier requested atoms and save them in the prepared data structure
 679  *
 680  */
 681 void get_atoms() {
 682     xcb_intern_atom_reply_t *reply;
 683     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
 684         if (reply == NULL) { \
 685             ELOG("Could not get atom %s\n", #name); \
 686             exit(EXIT_FAILURE); \
 687         } \
 688         atoms[name] = reply->atom; \
 689         free(reply);
 690
 691     #include "xcb_atoms.def"
 692     DLOG("Got Atoms\n");
 693 }
 694
 695 /*
 696  * Destroy the bar of the specified output
 697  *
 698  */
 699 void destroy_window(i3_output *output) {
 700     if (output == NULL) {
 701         return;
 702     }
 703     if (output->bar == XCB_NONE) {
 704         return;
 705     }
 706     xcb_destroy_window(xcb_connection, output->bar);
 707     output->bar = XCB_NONE;
 708 }
 709
 710 /*
 711  * Reallocate the statusline-buffer
 712  *
 713  */
 714 void realloc_sl_buffer() {
 715     DLOG("Re-allocating statusline-buffer, statusline_width = %d, xcb_screen->width_in_pixels = %d\n",
 716          statusline_width, xcb_screen->width_in_pixels);
 717     xcb_free_pixmap(xcb_connection, statusline_pm);
 718     statusline_pm = xcb_generate_id(xcb_connection);
 719     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 720                                                                xcb_screen->root_depth,
 721                                                                statusline_pm,
 722                                                                xcb_root,
 723                                                                MAX(xcb_screen->width_in_pixels, statusline_width),
 724                                                                xcb_screen->height_in_pixels);
 725
 726     uint32_t mask = XCB_GC_FOREGROUND;
 727     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 728     xcb_free_gc(xcb_connection, statusline_clear);
 729     statusline_clear = xcb_generate_id(xcb_connection);
 730     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 731                                                                statusline_clear,
 732                                                                xcb_root,
 733                                                                mask,
 734                                                                vals);
 735
 736     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 737     vals[0] = colors.bar_fg;
 738     statusline_ctx = xcb_generate_id(xcb_connection);
 739     xcb_free_gc(xcb_connection, statusline_ctx);
 740     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 741                                                             statusline_ctx,
 742                                                             xcb_root,
 743                                                             mask,
 744                                                             vals);
 745
 746     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 747         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 748         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 749         exit(EXIT_FAILURE);
 750     }
 751
 752 }
 753
 754 /*
 755  * Reconfigure all bars and create new bars for recently activated outputs
 756  *
 757  */
 758 void reconfig_windows() {
 759     uint32_t mask;
 760     uint32_t values[5];
 761
 762     i3_output *walk;
 763     SLIST_FOREACH(walk, outputs, slist) {
 764         if (!walk->active) {
 765             /* If an output is not active, we destroy its bar */
 766             /* FIXME: Maybe we rather want to unmap? */
 767             DLOG("Destroying window for output %s\n", walk->name);
 768             destroy_window(walk);
 769             continue;
 770         }
 771         if (walk->bar == XCB_NONE) {
 772             DLOG("Creating Window for output %s\n", walk->name);
 773
 774             walk->bar = xcb_generate_id(xcb_connection);
 775             walk->buffer = xcb_generate_id(xcb_connection);
 776             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 777             /* Black background */
 778             values[0] = colors.bar_bg;
 779             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
 780             values[1] = config.hide_on_modifier;
 781             /* The events we want to receive */
 782             values[2] = XCB_EVENT_MASK_EXPOSURE;
 783             if (!config.disable_ws) {
 784                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
 785             }
 786             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
 787                                                                      xcb_screen->root_depth,
 788                                                                      walk->bar,
 789                                                                      xcb_root,
 790                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
 791                                                                      walk->rect.w, font_height + 6,
 792                                                                      1,
 793                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
 794                                                                      xcb_screen->root_visual,
 795                                                                      mask,
 796                                                                      values);
 797
 798             /* The double-buffer we use to render stuff off-screen */
 799             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 800                                                                     xcb_screen->root_depth,
 801                                                                     walk->buffer,
 802                                                                     walk->bar,
 803                                                                     walk->rect.w,
 804                                                                     walk->rect.h);
 805
 806             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
 807              * this one */
 808             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
 809                                                                 XCB_PROP_MODE_REPLACE,
 810                                                                 walk->bar,
 811                                                                 atoms[_NET_WM_WINDOW_TYPE],
 812                                                                 XCB_ATOM_ATOM,
 813                                                                 32,
 814                                                                 1,
 815                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
 816
 817             /* We need to tell i3, where to reserve space for i3bar */
 818             /* left, right, top, bottom, left_start_y, left_end_y,
 819              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
 820              * bottom_end_x */
 821             /* A local struct to save the strut_partial property */
 822             struct {
 823                 uint32_t left;
 824                 uint32_t right;
 825                 uint32_t top;
 826                 uint32_t bottom;
 827                 uint32_t left_start_y;
 828                 uint32_t left_end_y;
 829                 uint32_t right_start_y;
 830                 uint32_t right_end_y;
 831                 uint32_t top_start_x;
 832                 uint32_t top_end_x;
 833                 uint32_t bottom_start_x;
 834                 uint32_t bottom_end_x;
 835             } __attribute__((__packed__)) strut_partial = {0,};
 836             switch (config.dockpos) {
 837                 case DOCKPOS_NONE:
 838                     break;
 839                 case DOCKPOS_TOP:
 840                     strut_partial.top = font_height + 6;
 841                     strut_partial.top_start_x = walk->rect.x;
 842                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
 843                     break;
 844                 case DOCKPOS_BOT:
 845                     strut_partial.bottom = font_height + 6;
 846                     strut_partial.bottom_start_x = walk->rect.x;
 847                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
 848                     break;
 849             }
 850             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
 851                                                                  XCB_PROP_MODE_REPLACE,
 852                                                                  walk->bar,
 853                                                                  atoms[_NET_WM_STRUT_PARTIAL],
 854                                                                  XCB_ATOM_CARDINAL,
 855                                                                  32,
 856                                                                  12,
 857                                                                  &strut_partial);
 858
 859             /* We also want a graphics-context for the bars (it defines the properties
 860              * with which we draw to them) */
 861             walk->bargc = xcb_generate_id(xcb_connection);
 862             mask = XCB_GC_FONT;
 863             values[0] = xcb_font;
 864             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
 865                                                                 walk->bargc,
 866                                                                 walk->bar,
 867                                                                 mask,
 868                                                                 values);
 869
 870             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
 871             xcb_void_cookie_t map_cookie;
 872             if (!config.hide_on_modifier) {
 873                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
 874             }
 875
 876             if (xcb_request_failed(win_cookie,   "Could not create window") ||
 877                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
 878                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
 879                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
 880                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
 881                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
 882                 exit(EXIT_FAILURE);
 883             }
 884         } else {
 885             /* We already have a bar, so we just reconfigure it */
 886             mask = XCB_CONFIG_WINDOW_X |
 887                    XCB_CONFIG_WINDOW_Y |
 888                    XCB_CONFIG_WINDOW_WIDTH |
 889                    XCB_CONFIG_WINDOW_HEIGHT |
 890                    XCB_CONFIG_WINDOW_STACK_MODE;
 891             values[0] = walk->rect.x;
 892             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 893             values[2] = walk->rect.w;
 894             values[3] = font_height + 6;
 895             values[4] = XCB_STACK_MODE_ABOVE;
 896
 897             DLOG("Destroying buffer for output %s", walk->name);
 898             xcb_free_pixmap(xcb_connection, walk->buffer);
 899
 900             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 901             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
 902                                                                         walk->bar,
 903                                                                         mask,
 904                                                                         values);
 905
 906             DLOG("Recreating buffer for output %s", walk->name);
 907             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 908                                                                     xcb_screen->root_depth,
 909                                                                     walk->buffer,
 910                                                                     walk->bar,
 911                                                                     walk->rect.w,
 912                                                                     walk->rect.h);
 913
 914             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
 915                 exit(EXIT_FAILURE);
 916             }
 917             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
 918                 exit(EXIT_FAILURE);
 919             }
 920         }
 921     }
 922 }
 923
 924 /*
 925  * Render the bars, with buttons and statusline
 926  *
 927  */
 928 void draw_bars() {
 929     DLOG("Drawing Bars...\n");
 930     int i = 0;
 931
 932     refresh_statusline();
 933
 934     i3_output *outputs_walk;
 935     SLIST_FOREACH(outputs_walk, outputs, slist) {
 936         if (!outputs_walk->active) {
 937             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
 938             continue;
 939         }
 940         if (outputs_walk->bar == XCB_NONE) {
 941             /* Oh shit, an active output without an own bar. Create it now! */
 942             reconfig_windows();
 943         }
 944         /* First things first: clear the backbuffer */
 945         uint32_t color = colors.bar_bg;
 946         xcb_change_gc(xcb_connection,
 947                       outputs_walk->bargc,
 948                       XCB_GC_FOREGROUND,
 949                       &color);
 950         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
 951         xcb_poly_fill_rectangle(xcb_connection,
 952                                 outputs_walk->buffer,
 953                                 outputs_walk->bargc,
 954                                 1,
 955                                 &rect);
 956
 957         if (statusline != NULL) {
 958             DLOG("Printing statusline!\n");
 959
 960             /* Luckily we already prepared a seperate pixmap containing the rendered
 961              * statusline, we just have to copy the relevant parts to the relevant
 962              * position */
 963             xcb_copy_area(xcb_connection,
 964                           statusline_pm,
 965                           outputs_walk->buffer,
 966                           outputs_walk->bargc,
 967                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
 968                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - 4)), 3,
 969                           MIN(outputs_walk->rect.w - 4, statusline_width), font_height);
 970         }
 971
 972         if (config.disable_ws) {
 973             continue;
 974         }
 975
 976         i3_ws *ws_walk;
 977         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
 978             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
 979             uint32_t fg_color = colors.inactive_ws_fg;
 980             uint32_t bg_color = colors.inactive_ws_bg;
 981             if (ws_walk->visible) {
 982                 if (!ws_walk->focused) {
 983                     fg_color = colors.active_ws_fg;
 984                     bg_color = colors.active_ws_bg;
 985                 } else {
 986                     fg_color = colors.focus_ws_fg;
 987                     bg_color = colors.focus_ws_bg;
 988                 }
 989             }
 990             if (ws_walk->urgent) {
 991                 DLOG("WS %s is urgent!\n", ws_walk->name);
 992                 fg_color = colors.urgent_ws_fg;
 993                 bg_color = colors.urgent_ws_bg;
 994                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
 995                 unhide_bars();
 996             }
 997             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
 998             uint32_t vals[] = { bg_color, bg_color };
 999             xcb_change_gc(xcb_connection,
1000                           outputs_walk->bargc,
1001                           mask,
1002                           vals);
1003             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
1004             xcb_poly_fill_rectangle(xcb_connection,
1005                                     outputs_walk->buffer,
1006                                     outputs_walk->bargc,
1007                                     1,
1008                                     &rect);
1009             xcb_change_gc(xcb_connection,
1010                           outputs_walk->bargc,
1011                           XCB_GC_FOREGROUND,
1012                           &fg_color);
1013             xcb_image_text_16(xcb_connection,
1014                               ws_walk->name_glyphs,
1015                               outputs_walk->buffer,
1016                               outputs_walk->bargc,
1017                               i + 5, font_info->font_ascent + 2,
1018                               ws_walk->ucs2_name);
1019             i += 10 + ws_walk->name_width;
1020         }
1021
1022         i = 0;
1023     }
1024
1025     redraw_bars();
1026 }
1027
1028 /*
1029  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1030  *
1031  */
1032 void redraw_bars() {
1033     i3_output *outputs_walk;
1034     SLIST_FOREACH(outputs_walk, outputs, slist) {
1035         if (!outputs_walk->active) {
1036             continue;
1037         }
1038         xcb_copy_area(xcb_connection,
1039                       outputs_walk->buffer,
1040                       outputs_walk->bar,
1041                       outputs_walk->bargc,
1042                       0, 0,
1043                       0, 0,
1044                       outputs_walk->rect.w,
1045                       outputs_walk->rect.h);
1046         xcb_flush(xcb_connection);
1047     }
1048 }