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