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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     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 410         return;
 411     }
 412
 413     switch (event->response_type & ~0x80) {
 414         case XCB_EXPOSE:
 415             /* Expose-events happen, when the window needs to be redrawn */
 416             redraw_bars();
 417             break;
 418         case XCB_BUTTON_PRESS:
 419             /* Button-press-events are mouse-buttons clicked on one of our bars */
 420             handle_button((xcb_button_press_event_t*) event);
 421             break;
 422     }
 423     FREE(event);
 424 }
 425
 426 /*
 427  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 428  * are triggered
 429  *
 430  */
 431 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 432 }
 433
 434 /*
 435  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 436  *
 437  */
 438 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 439     XkbEvent ev;
 440     int modstate = 0;
 441
 442     DLOG("Got XKB-Event!\n");
 443
 444     while (XPending(xkb_dpy)) {
 445         XNextEvent(xkb_dpy, (XEvent*)&ev);
 446
 447         if (ev.type != xkb_event_base) {
 448             ELOG("No Xkb-Event!\n");
 449             continue;
 450         }
 451
 452         if (ev.any.xkb_type != XkbStateNotify) {
 453             ELOG("No State Notify!\n");
 454             continue;
 455         }
 456
 457         unsigned int mods = ev.state.mods;
 458         modstate = mods & Mod4Mask;
 459     }
 460
 461     if (modstate != mod_pressed) {
 462         if (modstate == 0) {
 463             DLOG("Mod4 got released!\n");
 464             hide_bars();
 465         } else {
 466             DLOG("Mod4 got pressed!\n");
 467             unhide_bars();
 468         }
 469         mod_pressed = modstate;
 470     }
 471 }
 472
 473 /*
 474  * Initialize xcb and use the specified fontname for text-rendering
 475  *
 476  */
 477 char *init_xcb(char *fontname) {
 478     /* FIXME: xcb_connect leaks Memory */
 479     xcb_connection = xcb_connect(NULL, NULL);
 480     if (xcb_connection_has_error(xcb_connection)) {
 481         ELOG("Cannot open display\n");
 482         exit(EXIT_FAILURE);
 483     }
 484     DLOG("Connected to xcb\n");
 485
 486     /* We have to request the atoms we need */
 487     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 488     #include "xcb_atoms.def"
 489
 490     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 491     xcb_root = xcb_screen->root;
 492
 493     /* We load and allocate the font */
 494     xcb_font = xcb_generate_id(xcb_connection);
 495     xcb_void_cookie_t open_font_cookie;
 496     open_font_cookie = xcb_open_font_checked(xcb_connection,
 497                                              xcb_font,
 498                                              strlen(fontname),
 499                                              fontname);
 500
 501     /* We need to save info about the font, because we need the font's height and
 502      * information about the width of characters */
 503     xcb_query_font_cookie_t query_font_cookie;
 504     query_font_cookie = xcb_query_font(xcb_connection,
 505                                        xcb_font);
 506
 507     /* To grab modifiers without blocking other applications from receiving key-events
 508      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 509      * in xcb */
 510     if (config.hide_on_modifier) {
 511         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 512         xkb_major = XkbMajorVersion;
 513         xkb_minor = XkbMinorVersion;
 514
 515         xkb_dpy = XkbOpenDisplay(NULL,
 516                                  &xkb_event_base,
 517                                  &xkb_errbase,
 518                                  &xkb_major,
 519                                  &xkb_minor,
 520                                  &xkb_err);
 521
 522         if (xkb_dpy == NULL) {
 523             ELOG("No XKB!\n");
 524             exit(EXIT_FAILURE);
 525         }
 526
 527         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 528             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 529             exit(EXIT_FAILURE);
 530         }
 531
 532         int i1;
 533         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 534             ELOG("XKB not supported by X-server!\n");
 535             exit(EXIT_FAILURE);
 536         }
 537
 538         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 539             ELOG("Could not grab Key!\n");
 540             exit(EXIT_FAILURE);
 541         }
 542
 543         xkb_io = malloc(sizeof(ev_io));
 544         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 545         ev_io_start(main_loop, xkb_io);
 546         XFlush(xkb_dpy);
 547     }
 548
 549     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 550      * this way, we can choose to crop it */
 551     uint32_t mask = XCB_GC_FOREGROUND;
 552     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 553
 554     statusline_clear = xcb_generate_id(xcb_connection);
 555     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 556                                                                statusline_clear,
 557                                                                xcb_root,
 558                                                                mask,
 559                                                                vals);
 560
 561     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 562     vals[0] = colors.bar_fg;
 563     statusline_ctx = xcb_generate_id(xcb_connection);
 564     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 565                                                             statusline_ctx,
 566                                                             xcb_root,
 567                                                             mask,
 568                                                             vals);
 569
 570     statusline_pm = xcb_generate_id(xcb_connection);
 571     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 572                                                                xcb_screen->root_depth,
 573                                                                statusline_pm,
 574                                                                xcb_root,
 575                                                                xcb_screen->width_in_pixels,
 576                                                                xcb_screen->height_in_pixels);
 577
 578
 579     /* The various Watchers to communicate with xcb */
 580     xcb_io = malloc(sizeof(ev_io));
 581     xcb_prep = malloc(sizeof(ev_prepare));
 582     xcb_chk = malloc(sizeof(ev_check));
 583
 584     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 585     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 586     ev_check_init(xcb_chk, &xcb_chk_cb);
 587
 588     ev_io_start(main_loop, xcb_io);
 589     ev_prepare_start(main_loop, xcb_prep);
 590     ev_check_start(main_loop, xcb_chk);
 591
 592     /* Now we get the atoms and save them in a nice data structure */
 593     get_atoms();
 594
 595     xcb_get_property_cookie_t path_cookie;
 596     path_cookie = xcb_get_property_unchecked(xcb_connection,
 597                                    0,
 598                                    xcb_root,
 599                                    atoms[I3_SOCKET_PATH],
 600                                    XCB_GET_PROPERTY_TYPE_ANY,
 601                                    0, PATH_MAX);
 602
 603     /* We check, if i3 set its socket-path */
 604     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 605                                                                   path_cookie,
 606                                                                   NULL);
 607     char *path = NULL;
 608     if (path_reply) {
 609         int len = xcb_get_property_value_length(path_reply);
 610         if (len != 0) {
 611             path = strndup(xcb_get_property_value(path_reply), len);
 612         }
 613     }
 614
 615     /* Now we save the font-infos */
 616     font_info = xcb_query_font_reply(xcb_connection,
 617                                      query_font_cookie,
 618                                      NULL);
 619
 620     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 621         exit(EXIT_FAILURE);
 622     }
 623
 624     font_height = font_info->font_ascent + font_info->font_descent;
 625
 626     if (xcb_query_font_char_infos_length(font_info) == 0) {
 627         font_table = NULL;
 628     } else {
 629         font_table = xcb_query_font_char_infos(font_info);
 630     }
 631
 632     DLOG("Calculated Font-height: %d\n", font_height);
 633
 634     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 635         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 636         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 637         exit(EXIT_FAILURE);
 638     }
 639
 640     return path;
 641 }
 642
 643 /*
 644  * Cleanup the xcb-stuff.
 645  * Called once, before the program terminates.
 646  *
 647  */
 648 void clean_xcb() {
 649     i3_output *o_walk;
 650     free_workspaces();
 651     SLIST_FOREACH(o_walk, outputs, slist) {
 652         destroy_window(o_walk);
 653         FREE(o_walk->workspaces);
 654         FREE(o_walk->name);
 655     }
 656     FREE_SLIST(outputs, i3_output);
 657     FREE(outputs);
 658
 659     xcb_disconnect(xcb_connection);
 660
 661     ev_check_stop(main_loop, xcb_chk);
 662     ev_prepare_stop(main_loop, xcb_prep);
 663     ev_io_stop(main_loop, xcb_io);
 664
 665     FREE(xcb_chk);
 666     FREE(xcb_prep);
 667     FREE(xcb_io);
 668     FREE(font_info);
 669 }
 670
 671 /*
 672  * Get the earlier requested atoms and save them in the prepared data structure
 673  *
 674  */
 675 void get_atoms() {
 676     xcb_intern_atom_reply_t *reply;
 677     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
 678         if (reply == NULL) { \
 679             ELOG("Could not get atom %s\n", #name); \
 680             exit(EXIT_FAILURE); \
 681         } \
 682         atoms[name] = reply->atom; \
 683         free(reply);
 684
 685     #include "xcb_atoms.def"
 686     DLOG("Got Atoms\n");
 687 }
 688
 689 /*
 690  * Destroy the bar of the specified output
 691  *
 692  */
 693 void destroy_window(i3_output *output) {
 694     if (output == NULL) {
 695         return;
 696     }
 697     if (output->bar == XCB_NONE) {
 698         return;
 699     }
 700     xcb_destroy_window(xcb_connection, output->bar);
 701     output->bar = XCB_NONE;
 702 }
 703
 704 /*
 705  * Reallocate the statusline-buffer
 706  *
 707  */
 708 void realloc_sl_buffer() {
 709     DLOG("Re-allocating statusline-buffer, statusline_width = %d, xcb_screen->width_in_pixels = %d\n",
 710          statusline_width, xcb_screen->width_in_pixels);
 711     xcb_free_pixmap(xcb_connection, statusline_pm);
 712     statusline_pm = xcb_generate_id(xcb_connection);
 713     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 714                                                                xcb_screen->root_depth,
 715                                                                statusline_pm,
 716                                                                xcb_root,
 717                                                                MAX(xcb_screen->width_in_pixels, statusline_width),
 718                                                                xcb_screen->height_in_pixels);
 719
 720     uint32_t mask = XCB_GC_FOREGROUND;
 721     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 722     xcb_free_gc(xcb_connection, statusline_clear);
 723     statusline_clear = xcb_generate_id(xcb_connection);
 724     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 725                                                                statusline_clear,
 726                                                                xcb_root,
 727                                                                mask,
 728                                                                vals);
 729
 730     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 731     vals[0] = colors.bar_fg;
 732     statusline_ctx = xcb_generate_id(xcb_connection);
 733     xcb_free_gc(xcb_connection, statusline_ctx);
 734     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 735                                                             statusline_ctx,
 736                                                             xcb_root,
 737                                                             mask,
 738                                                             vals);
 739
 740     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 741         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 742         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 743         exit(EXIT_FAILURE);
 744     }
 745
 746 }
 747
 748 /*
 749  * Reconfigure all bars and create new bars for recently activated outputs
 750  *
 751  */
 752 void reconfig_windows() {
 753     uint32_t mask;
 754     uint32_t values[5];
 755
 756     i3_output *walk;
 757     SLIST_FOREACH(walk, outputs, slist) {
 758         if (!walk->active) {
 759             /* If an output is not active, we destroy its bar */
 760             /* FIXME: Maybe we rather want to unmap? */
 761             DLOG("Destroying window for output %s\n", walk->name);
 762             destroy_window(walk);
 763             continue;
 764         }
 765         if (walk->bar == XCB_NONE) {
 766             DLOG("Creating Window for output %s\n", walk->name);
 767
 768             walk->bar = xcb_generate_id(xcb_connection);
 769             walk->buffer = xcb_generate_id(xcb_connection);
 770             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 771             /* Black background */
 772             values[0] = colors.bar_bg;
 773             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
 774             values[1] = config.hide_on_modifier;
 775             /* The events we want to receive */
 776             values[2] = XCB_EVENT_MASK_EXPOSURE;
 777             if (!config.disable_ws) {
 778                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
 779             }
 780             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
 781                                                                      xcb_screen->root_depth,
 782                                                                      walk->bar,
 783                                                                      xcb_root,
 784                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
 785                                                                      walk->rect.w, font_height + 6,
 786                                                                      1,
 787                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
 788                                                                      xcb_screen->root_visual,
 789                                                                      mask,
 790                                                                      values);
 791
 792             /* The double-buffer we use to render stuff off-screen */
 793             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 794                                                                     xcb_screen->root_depth,
 795                                                                     walk->buffer,
 796                                                                     walk->bar,
 797                                                                     walk->rect.w,
 798                                                                     walk->rect.h);
 799
 800             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
 801              * this one */
 802             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
 803                                                                 XCB_PROP_MODE_REPLACE,
 804                                                                 walk->bar,
 805                                                                 atoms[_NET_WM_WINDOW_TYPE],
 806                                                                 XCB_ATOM_ATOM,
 807                                                                 32,
 808                                                                 1,
 809                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
 810
 811             /* We need to tell i3, where to reserve space for i3bar */
 812             /* left, right, top, bottom, left_start_y, left_end_y,
 813              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
 814              * bottom_end_x */
 815             /* A local struct to save the strut_partial property */
 816             struct {
 817                 uint32_t left;
 818                 uint32_t right;
 819                 uint32_t top;
 820                 uint32_t bottom;
 821                 uint32_t left_start_y;
 822                 uint32_t left_end_y;
 823                 uint32_t right_start_y;
 824                 uint32_t right_end_y;
 825                 uint32_t top_start_x;
 826                 uint32_t top_end_x;
 827                 uint32_t bottom_start_x;
 828                 uint32_t bottom_end_x;
 829             } __attribute__((__packed__)) strut_partial = {0,};
 830             switch (config.dockpos) {
 831                 case DOCKPOS_NONE:
 832                     break;
 833                 case DOCKPOS_TOP:
 834                     strut_partial.top = font_height + 6;
 835                     strut_partial.top_start_x = walk->rect.x;
 836                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
 837                     break;
 838                 case DOCKPOS_BOT:
 839                     strut_partial.bottom = font_height + 6;
 840                     strut_partial.bottom_start_x = walk->rect.x;
 841                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
 842                     break;
 843             }
 844             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
 845                                                                  XCB_PROP_MODE_REPLACE,
 846                                                                  walk->bar,
 847                                                                  atoms[_NET_WM_STRUT_PARTIAL],
 848                                                                  XCB_ATOM_CARDINAL,
 849                                                                  32,
 850                                                                  12,
 851                                                                  &strut_partial);
 852
 853             /* We also want a graphics-context for the bars (it defines the properties
 854              * with which we draw to them) */
 855             walk->bargc = xcb_generate_id(xcb_connection);
 856             mask = XCB_GC_FONT;
 857             values[0] = xcb_font;
 858             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
 859                                                                 walk->bargc,
 860                                                                 walk->bar,
 861                                                                 mask,
 862                                                                 values);
 863
 864             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
 865             xcb_void_cookie_t map_cookie;
 866             if (!config.hide_on_modifier) {
 867                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
 868             }
 869
 870             if (xcb_request_failed(win_cookie,   "Could not create window") ||
 871                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
 872                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
 873                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
 874                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
 875                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
 876                 exit(EXIT_FAILURE);
 877             }
 878         } else {
 879             /* We already have a bar, so we just reconfigure it */
 880             mask = XCB_CONFIG_WINDOW_X |
 881                    XCB_CONFIG_WINDOW_Y |
 882                    XCB_CONFIG_WINDOW_WIDTH |
 883                    XCB_CONFIG_WINDOW_HEIGHT |
 884                    XCB_CONFIG_WINDOW_STACK_MODE;
 885             values[0] = walk->rect.x;
 886             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 887             values[2] = walk->rect.w;
 888             values[3] = font_height + 6;
 889             values[4] = XCB_STACK_MODE_ABOVE;
 890
 891             DLOG("Destroying buffer for output %s", walk->name);
 892             xcb_free_pixmap(xcb_connection, walk->buffer);
 893
 894             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 895             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
 896                                                                         walk->bar,
 897                                                                         mask,
 898                                                                         values);
 899
 900             DLOG("Recreating buffer for output %s", walk->name);
 901             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 902                                                                     xcb_screen->root_depth,
 903                                                                     walk->buffer,
 904                                                                     walk->bar,
 905                                                                     walk->rect.w,
 906                                                                     walk->rect.h);
 907
 908             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
 909                 exit(EXIT_FAILURE);
 910             }
 911             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
 912                 exit(EXIT_FAILURE);
 913             }
 914         }
 915     }
 916 }
 917
 918 /*
 919  * Render the bars, with buttons and statusline
 920  *
 921  */
 922 void draw_bars() {
 923     DLOG("Drawing Bars...\n");
 924     int i = 0;
 925
 926     refresh_statusline();
 927
 928     i3_output *outputs_walk;
 929     SLIST_FOREACH(outputs_walk, outputs, slist) {
 930         if (!outputs_walk->active) {
 931             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
 932             continue;
 933         }
 934         if (outputs_walk->bar == XCB_NONE) {
 935             /* Oh shit, an active output without an own bar. Create it now! */
 936             reconfig_windows();
 937         }
 938         /* First things first: clear the backbuffer */
 939         uint32_t color = colors.bar_bg;
 940         xcb_change_gc(xcb_connection,
 941                       outputs_walk->bargc,
 942                       XCB_GC_FOREGROUND,
 943                       &color);
 944         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
 945         xcb_poly_fill_rectangle(xcb_connection,
 946                                 outputs_walk->buffer,
 947                                 outputs_walk->bargc,
 948                                 1,
 949                                 &rect);
 950
 951         if (statusline != NULL) {
 952             DLOG("Printing statusline!\n");
 953
 954             /* Luckily we already prepared a seperate pixmap containing the rendered
 955              * statusline, we just have to copy the relevant parts to the relevant
 956              * position */
 957             xcb_copy_area(xcb_connection,
 958                           statusline_pm,
 959                           outputs_walk->buffer,
 960                           outputs_walk->bargc,
 961                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
 962                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - 4)), 3,
 963                           MIN(outputs_walk->rect.w - 4, statusline_width), font_height);
 964         }
 965
 966         if (config.disable_ws) {
 967             continue;
 968         }
 969
 970         i3_ws *ws_walk;
 971         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
 972             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
 973             uint32_t fg_color = colors.inactive_ws_fg;
 974             uint32_t bg_color = colors.inactive_ws_bg;
 975             if (ws_walk->visible) {
 976                 if (!ws_walk->focused) {
 977                     fg_color = colors.active_ws_fg;
 978                     bg_color = colors.active_ws_bg;
 979                 } else {
 980                     fg_color = colors.focus_ws_fg;
 981                     bg_color = colors.focus_ws_bg;
 982                 }
 983             }
 984             if (ws_walk->urgent) {
 985                 DLOG("WS %s is urgent!\n", ws_walk->name);
 986                 fg_color = colors.urgent_ws_fg;
 987                 bg_color = colors.urgent_ws_bg;
 988                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
 989                 unhide_bars();
 990             }
 991             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
 992             uint32_t vals[] = { bg_color, bg_color };
 993             xcb_change_gc(xcb_connection,
 994                           outputs_walk->bargc,
 995                           mask,
 996                           vals);
 997             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
 998             xcb_poly_fill_rectangle(xcb_connection,
 999                                     outputs_walk->buffer,
1000                                     outputs_walk->bargc,
1001                                     1,
1002                                     &rect);
1003             xcb_change_gc(xcb_connection,
1004                           outputs_walk->bargc,
1005                           XCB_GC_FOREGROUND,
1006                           &fg_color);
1007             xcb_image_text_16(xcb_connection,
1008                               ws_walk->name_glyphs,
1009                               outputs_walk->buffer,
1010                               outputs_walk->bargc,
1011                               i + 5, font_info->font_ascent + 2,
1012                               ws_walk->ucs2_name);
1013             i += 10 + ws_walk->name_width;
1014         }
1015
1016         i = 0;
1017     }
1018
1019     redraw_bars();
1020 }
1021
1022 /*
1023  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1024  *
1025  */
1026 void redraw_bars() {
1027     i3_output *outputs_walk;
1028     SLIST_FOREACH(outputs_walk, outputs, slist) {
1029         if (!outputs_walk->active) {
1030             continue;
1031         }
1032         xcb_copy_area(xcb_connection,
1033                       outputs_walk->buffer,
1034                       outputs_walk->bar,
1035                       outputs_walk->bargc,
1036                       0, 0,
1037                       0, 0,
1038                       outputs_walk->rect.w,
1039                       outputs_walk->rect.h);
1040         xcb_flush(xcb_connection);
1041     }
1042 }