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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 /* We save the Atoms in an easy to access array, indexed by an enum */
  31 enum {
  32     #define ATOM_DO(name) name,
  33     #include "xcb_atoms.def"
  34     NUM_ATOMS
  35 };
  36
  37 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  38 xcb_atom_t               atoms[NUM_ATOMS];
  39
  40 /* Variables, that are the same for all functions at all times */
  41 xcb_connection_t *xcb_connection;
  42 xcb_screen_t     *xcb_screen;
  43 xcb_window_t     xcb_root;
  44 xcb_font_t       xcb_font;
  45
  46 /* We need to cache some data to speed up text-width-prediction */
  47 xcb_query_font_reply_t *font_info;
  48 int                    font_height;
  49 xcb_charinfo_t         *font_table;
  50
  51 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  52 Display          *xkb_dpy;
  53 int              xkb_event_base;
  54 int              mod_pressed = 0;
  55
  56 /* Because the statusline is the same on all outputs, we have
  57  * global buffer to render it on */
  58 xcb_gcontext_t   statusline_ctx;
  59 xcb_gcontext_t   statusline_clear;
  60 xcb_pixmap_t     statusline_pm;
  61 uint32_t         statusline_width;
  62
  63 /* Event-Watchers, to interact with the user */
  64 ev_prepare *xcb_prep;
  65 ev_check   *xcb_chk;
  66 ev_io      *xcb_io;
  67 ev_io      *xkb_io;
  68
  69 /* The parsed colors */
  70 struct xcb_colors_t {
  71     uint32_t bar_fg;
  72     uint32_t bar_bg;
  73     uint32_t active_ws_fg;
  74     uint32_t active_ws_bg;
  75     uint32_t inactive_ws_fg;
  76     uint32_t inactive_ws_bg;
  77     uint32_t urgent_ws_bg;
  78     uint32_t urgent_ws_fg;
  79     uint32_t focus_ws_bg;
  80     uint32_t focus_ws_fg;
  81 };
  82 struct xcb_colors_t colors;
  83
  84 /* We define xcb_request_failed as a macro to include the relevant line-number */
  85 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
  86 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
  87     xcb_generic_error_t *err;
  88     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
  89         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
  90         return err->error_code;
  91     }
  92     return 0;
  93 }
  94
  95 /*
  96  * Predicts the length of text based on cached data.
  97  * The string has to be encoded in ucs2 and glyph_len has to be the length
  98  * of the string (in glyphs).
  99  *
 100  */
 101 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
 102     /* If we don't have per-character data, return the maximum width */
 103     if (font_table == NULL) {
 104         return (font_info->max_bounds.character_width * length);
 105     }
 106
 107     uint32_t width = 0;
 108     uint32_t i;
 109
 110     for (i = 0; i < length; i++) {
 111         xcb_charinfo_t *info;
 112         int row = text[i].byte1;
 113         int col = text[i].byte2;
 114
 115         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 116             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 117             continue;
 118         }
 119
 120         /* Don't you ask me, how this one works… */
 121         info = &font_table[((row - font_info->min_byte1) *
 122                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 123                            (col - font_info->min_char_or_byte2)];
 124
 125         if (info->character_width != 0 ||
 126             (info->right_side_bearing |
 127              info->left_side_bearing |
 128              info->ascent |
 129              info->descent) != 0) {
 130             width += info->character_width;
 131         }
 132     }
 133
 134     return width;
 135 }
 136
 137 /*
 138  * Draws text given in UCS-2-encoding to a given drawable and position
 139  *
 140  */
 141 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 142                xcb_char2b_t *text, uint32_t glyph_count) {
 143     int offset = 0;
 144     int16_t pos_x = x;
 145     int16_t font_ascent = font_info->font_ascent;
 146
 147     while (glyph_count > 0) {
 148         uint8_t chunk_size = MIN(255, glyph_count);
 149         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 150
 151         xcb_image_text_16(xcb_connection,
 152                           chunk_size,
 153                           drawable,
 154                           ctx,
 155                           pos_x, y + font_ascent,
 156                           text + offset);
 157
 158         offset += chunk_size;
 159         pos_x += chunk_width;
 160         glyph_count -= chunk_size;
 161     }
 162 }
 163
 164 /*
 165  * Converts a colorstring to a colorpixel as expected from xcb_change_gc.
 166  * s is assumed to be in the format "rrggbb"
 167  *
 168  */
 169 uint32_t get_colorpixel(const char *s) {
 170     char strings[3][3] = { { s[0], s[1], '\0'} ,
 171                            { s[2], s[3], '\0'} ,
 172                            { s[4], s[5], '\0'} };
 173     uint8_t r = strtol(strings[0], NULL, 16);
 174     uint8_t g = strtol(strings[1], NULL, 16);
 175     uint8_t b = strtol(strings[2], NULL, 16);
 176     return (r << 16 | g << 8 | b);
 177 }
 178
 179 /*
 180  * Redraws the statusline to the buffer
 181  *
 182  */
 183 void refresh_statusline() {
 184     int glyph_count;
 185
 186     if (statusline == NULL) {
 187         return;
 188     }
 189
 190     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 191     statusline_width = predict_text_extents(text, glyph_count);
 192
 193     xcb_rectangle_t rect = { 0, 0, xcb_screen->width_in_pixels, font_height };
 194     xcb_poly_fill_rectangle(xcb_connection, statusline_pm, statusline_clear, 1, &rect);
 195     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 196
 197     FREE(text);
 198 }
 199
 200 /*
 201  * Hides all bars (unmaps them)
 202  *
 203  */
 204 void hide_bars() {
 205     if (!config.hide_on_modifier) {
 206         return;
 207     }
 208
 209     i3_output *walk;
 210     SLIST_FOREACH(walk, outputs, slist) {
 211         if (!walk->active) {
 212             continue;
 213         }
 214         xcb_unmap_window(xcb_connection, walk->bar);
 215     }
 216     stop_child();
 217 }
 218
 219 /*
 220  * Unhides all bars (maps them)
 221  *
 222  */
 223 void unhide_bars() {
 224     if (!config.hide_on_modifier) {
 225         return;
 226     }
 227
 228     i3_output           *walk;
 229     xcb_void_cookie_t   cookie;
 230     uint32_t            mask;
 231     uint32_t            values[5];
 232
 233     cont_child();
 234
 235     SLIST_FOREACH(walk, outputs, slist) {
 236         if (walk->bar == XCB_NONE) {
 237             continue;
 238         }
 239         mask = XCB_CONFIG_WINDOW_X |
 240                XCB_CONFIG_WINDOW_Y |
 241                XCB_CONFIG_WINDOW_WIDTH |
 242                XCB_CONFIG_WINDOW_HEIGHT |
 243                XCB_CONFIG_WINDOW_STACK_MODE;
 244         values[0] = walk->rect.x;
 245         values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 246         values[2] = walk->rect.w;
 247         values[3] = font_height + 6;
 248         values[4] = XCB_STACK_MODE_ABOVE;
 249         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 250         cookie = xcb_configure_window_checked(xcb_connection,
 251                                               walk->bar,
 252                                               mask,
 253                                               values);
 254
 255         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 256             exit(EXIT_FAILURE);
 257         }
 258         xcb_map_window(xcb_connection, walk->bar);
 259     }
 260 }
 261
 262 /*
 263  * Parse the colors into a format that we can use
 264  *
 265  */
 266 void init_colors(const struct xcb_color_strings_t *new_colors) {
 267 #define PARSE_COLOR(name, def) \
 268     do { \
 269         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 270     } while  (0)
 271     PARSE_COLOR(bar_fg, "FFFFFF");
 272     PARSE_COLOR(bar_bg, "000000");
 273     PARSE_COLOR(active_ws_fg, "FFFFFF");
 274     PARSE_COLOR(active_ws_bg, "480000");
 275     PARSE_COLOR(inactive_ws_fg, "FFFFFF");
 276     PARSE_COLOR(inactive_ws_bg, "240000");
 277     PARSE_COLOR(urgent_ws_fg, "FFFFFF");
 278     PARSE_COLOR(urgent_ws_bg, "002400");
 279     PARSE_COLOR(focus_ws_fg, "FFFFFF");
 280     PARSE_COLOR(focus_ws_bg, "480000");
 281 #undef PARSE_COLOR
 282 }
 283
 284 /*
 285  * Handle a button-press-event (i.c. a mouse click on one of our bars).
 286  * We determine, wether the click occured on a ws-button or if the scroll-
 287  * wheel was used and change the workspace appropriately
 288  *
 289  */
 290 void handle_button(xcb_button_press_event_t *event) {
 291     i3_ws *cur_ws;
 292
 293     /* Determine, which bar was clicked */
 294     i3_output *walk;
 295     xcb_window_t bar = event->event;
 296     SLIST_FOREACH(walk, outputs, slist) {
 297         if (walk->bar == bar) {
 298             break;
 299         }
 300     }
 301
 302     if (walk == NULL) {
 303         DLOG("Unknown Bar klicked!\n");
 304         return;
 305     }
 306
 307     /* TODO: Move this to extern get_ws_for_output() */
 308     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 309         if (cur_ws->visible) {
 310             break;
 311         }
 312     }
 313
 314     if (cur_ws == NULL) {
 315         DLOG("No Workspace active?\n");
 316         return;
 317     }
 318
 319     int32_t x = event->event_x;
 320
 321     DLOG("Got Button %d\n", event->detail);
 322
 323     switch (event->detail) {
 324         case 1:
 325             /* Left Mousbutton. We determine, which button was clicked
 326              * and set cur_ws accordingly */
 327             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 328                 DLOG("x = %d\n", x);
 329                 if (x < cur_ws->name_width + 10) {
 330                     break;
 331                 }
 332                 x -= cur_ws->name_width + 10;
 333             }
 334             if (cur_ws == NULL) {
 335                 return;
 336             }
 337             break;
 338         case 4:
 339             /* Mouse wheel down. We select the next ws */
 340             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 341                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 342             } else {
 343                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 344             }
 345             break;
 346         case 5:
 347             /* Mouse wheel up. We select the previos ws */
 348             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 349                 cur_ws = TAILQ_FIRST(walk->workspaces);
 350             } else {
 351                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 352             }
 353             break;
 354     }
 355
 356     char buffer[strlen(cur_ws->name) + 11];
 357     snprintf(buffer, 50, "workspace %s", cur_ws->name);
 358     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 359 }
 360
 361 /*
 362  * This function is called immediately bevor the main loop locks. We flush xcb
 363  * then (and only then)
 364  *
 365  */
 366 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 367     xcb_flush(xcb_connection);
 368 }
 369
 370 /*
 371  * This function is called immediately after the main loop locks, so when one
 372  * of the watchers registered an event.
 373  * We check wether an X-Event arrived and handle it.
 374  *
 375  */
 376 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 377     xcb_generic_event_t *event;
 378     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 379         return;
 380     }
 381
 382     switch (event->response_type & ~0x80) {
 383         case XCB_EXPOSE:
 384             /* Expose-events happen, when the window needs to be redrawn */
 385             redraw_bars();
 386             break;
 387         case XCB_BUTTON_PRESS:
 388             /* Button-press-events are mouse-buttons clicked on one of our bars */
 389             handle_button((xcb_button_press_event_t*) event);
 390             break;
 391     }
 392     FREE(event);
 393 }
 394
 395 /*
 396  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 397  * are triggered
 398  *
 399  */
 400 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 401 }
 402
 403 /*
 404  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 405  *
 406  */
 407 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 408     XkbEvent ev;
 409     int modstate = 0;
 410
 411     DLOG("Got XKB-Event!\n");
 412
 413     while (XPending(xkb_dpy)) {
 414         XNextEvent(xkb_dpy, (XEvent*)&ev);
 415
 416         if (ev.type != xkb_event_base) {
 417             ELOG("No Xkb-Event!\n");
 418             continue;
 419         }
 420
 421         if (ev.any.xkb_type != XkbStateNotify) {
 422             ELOG("No State Notify!\n");
 423             continue;
 424         }
 425
 426         unsigned int mods = ev.state.mods;
 427         modstate = mods & Mod4Mask;
 428     }
 429
 430     if (modstate != mod_pressed) {
 431         if (modstate == 0) {
 432             DLOG("Mod4 got released!\n");
 433             hide_bars();
 434         } else {
 435             DLOG("Mod4 got pressed!\n");
 436             unhide_bars();
 437         }
 438         mod_pressed = modstate;
 439     }
 440 }
 441
 442 /*
 443  * Initialize xcb and use the specified fontname for text-rendering
 444  *
 445  */
 446 char *init_xcb(char *fontname) {
 447     /* FIXME: xcb_connect leaks Memory */
 448     xcb_connection = xcb_connect(NULL, NULL);
 449     if (xcb_connection_has_error(xcb_connection)) {
 450         ELOG("Cannot open display\n");
 451         exit(EXIT_FAILURE);
 452     }
 453     DLOG("Connected to xcb\n");
 454
 455     /* We have to request the atoms we need */
 456     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 457     #include "xcb_atoms.def"
 458
 459     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 460     xcb_root = xcb_screen->root;
 461
 462     /* We load and allocate the font */
 463     xcb_font = xcb_generate_id(xcb_connection);
 464     xcb_void_cookie_t open_font_cookie;
 465     open_font_cookie = xcb_open_font_checked(xcb_connection,
 466                                              xcb_font,
 467                                              strlen(fontname),
 468                                              fontname);
 469
 470     /* We need to save info about the font, because we need the fonts height and
 471      * information about the width of characters */
 472     xcb_query_font_cookie_t query_font_cookie;
 473     query_font_cookie = xcb_query_font(xcb_connection,
 474                                        xcb_font);
 475
 476     /* To grab modifiers without blocking other applications from receiving key-events
 477      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 478      * in xcb */
 479     if (config.hide_on_modifier) {
 480         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 481         xkb_major = XkbMajorVersion;
 482         xkb_minor = XkbMinorVersion;
 483
 484         char *dispname = getenv("DISPLAY");
 485         if (dispname == NULL) {
 486             dispname = ":0";
 487         }
 488         xkb_dpy = XkbOpenDisplay(dispname,
 489                                  &xkb_event_base,
 490                                  &xkb_errbase,
 491                                  &xkb_major,
 492                                  &xkb_minor,
 493                                  &xkb_err);
 494
 495         if (xkb_dpy == NULL) {
 496             ELOG("No XKB!\n");
 497             exit(EXIT_FAILURE);
 498         }
 499
 500         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 501             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 502             exit(EXIT_FAILURE);
 503         }
 504
 505         int i1;
 506         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 507             ELOG("XKB not supported by X-server!\n");
 508             exit(EXIT_FAILURE);
 509         }
 510
 511         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 512             ELOG("Could not grab Key!\n");
 513             exit(EXIT_FAILURE);
 514         }
 515
 516         xkb_io = malloc(sizeof(ev_io));
 517         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 518         ev_io_start(main_loop, xkb_io);
 519         XFlush(xkb_dpy);
 520     }
 521
 522     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 523      * this way, we can choose to crop it */
 524     uint32_t mask = XCB_GC_FOREGROUND;
 525     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 526
 527     statusline_clear = xcb_generate_id(xcb_connection);
 528     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 529                                                                statusline_clear,
 530                                                                xcb_root,
 531                                                                mask,
 532                                                                vals);
 533
 534     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 535     vals[0] = colors.bar_fg;
 536     statusline_ctx = xcb_generate_id(xcb_connection);
 537     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 538                                                             statusline_ctx,
 539                                                             xcb_root,
 540                                                             mask,
 541                                                             vals);
 542
 543     statusline_pm = xcb_generate_id(xcb_connection);
 544     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 545                                                                xcb_screen->root_depth,
 546                                                                statusline_pm,
 547                                                                xcb_root,
 548                                                                xcb_screen->width_in_pixels,
 549                                                                xcb_screen->height_in_pixels);
 550
 551
 552     /* The varios Watchers to communicate with xcb */
 553     xcb_io = malloc(sizeof(ev_io));
 554     xcb_prep = malloc(sizeof(ev_prepare));
 555     xcb_chk = malloc(sizeof(ev_check));
 556
 557     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 558     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 559     ev_check_init(xcb_chk, &xcb_chk_cb);
 560
 561     ev_io_start(main_loop, xcb_io);
 562     ev_prepare_start(main_loop, xcb_prep);
 563     ev_check_start(main_loop, xcb_chk);
 564
 565     /* Now we get the atoms and save them in a nice data-structure */
 566     get_atoms();
 567
 568     xcb_get_property_cookie_t path_cookie;
 569     path_cookie = xcb_get_property_unchecked(xcb_connection,
 570                                    0,
 571                                    xcb_root,
 572                                    atoms[I3_SOCKET_PATH],
 573                                    XCB_GET_PROPERTY_TYPE_ANY,
 574                                    0, PATH_MAX);
 575
 576     /* We check, if i3 set it's socket-path */
 577     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 578                                                                   path_cookie,
 579                                                                   NULL);
 580     char *path = NULL;
 581     if (path_reply) {
 582         int len = xcb_get_property_value_length(path_reply);
 583         if (len != 0) {
 584             path = strndup(xcb_get_property_value(path_reply), len);
 585         }
 586     }
 587
 588     /* Now we save the font-infos */
 589     font_info = xcb_query_font_reply(xcb_connection,
 590                                      query_font_cookie,
 591                                      NULL);
 592
 593     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 594         exit(EXIT_FAILURE);
 595     }
 596
 597     font_height = font_info->font_ascent + font_info->font_descent;
 598
 599     if (xcb_query_font_char_infos_length(font_info) == 0) {
 600         font_table = NULL;
 601     } else {
 602         font_table = xcb_query_font_char_infos(font_info);
 603     }
 604
 605     DLOG("Calculated Font-height: %d\n", font_height);
 606
 607     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 608         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 609         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 610         exit(EXIT_FAILURE);
 611     }
 612
 613     return path;
 614 }
 615
 616 /*
 617  * Cleanup the xcb-stuff.
 618  * Called once, before the program terminates.
 619  *
 620  */
 621 void clean_xcb() {
 622     i3_output *o_walk;
 623     free_workspaces();
 624     SLIST_FOREACH(o_walk, outputs, slist) {
 625         destroy_window(o_walk);
 626         FREE(o_walk->workspaces);
 627         FREE(o_walk->name);
 628     }
 629     FREE_SLIST(outputs, i3_output);
 630     FREE(outputs);
 631
 632     xcb_disconnect(xcb_connection);
 633
 634     ev_check_stop(main_loop, xcb_chk);
 635     ev_prepare_stop(main_loop, xcb_prep);
 636     ev_io_stop(main_loop, xcb_io);
 637
 638     FREE(xcb_chk);
 639     FREE(xcb_prep);
 640     FREE(xcb_io);
 641     FREE(font_info);
 642 }
 643
 644 /*
 645  * Get the earlier requested atoms and save them in the prepared data-structure
 646  *
 647  */
 648 void get_atoms() {
 649     xcb_intern_atom_reply_t *reply;
 650     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
 651         if (reply == NULL) { \
 652             ELOG("Could not get atom %s\n", #name); \
 653             exit(EXIT_FAILURE); \
 654         } \
 655         atoms[name] = reply->atom; \
 656         free(reply);
 657
 658     #include "xcb_atoms.def"
 659     DLOG("Got Atoms\n");
 660 }
 661
 662 /*
 663  * Destroy the bar of the specified output
 664  *
 665  */
 666 void destroy_window(i3_output *output) {
 667     if (output == NULL) {
 668         return;
 669     }
 670     if (output->bar == XCB_NONE) {
 671         return;
 672     }
 673     xcb_destroy_window(xcb_connection, output->bar);
 674     output->bar = XCB_NONE;
 675 }
 676
 677 /*
 678  * Reallocate the statusline-buffer
 679  *
 680  */
 681 void realloc_sl_buffer() {
 682     xcb_free_pixmap(xcb_connection, statusline_pm);
 683     statusline_pm = xcb_generate_id(xcb_connection);
 684     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 685                                                                xcb_screen->root_depth,
 686                                                                statusline_pm,
 687                                                                xcb_root,
 688                                                                xcb_screen->width_in_pixels,
 689                                                                xcb_screen->height_in_pixels);
 690
 691     uint32_t mask = XCB_GC_FOREGROUND;
 692     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 693     xcb_free_gc(xcb_connection, statusline_clear);
 694     statusline_clear = xcb_generate_id(xcb_connection);
 695     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 696                                                                statusline_clear,
 697                                                                xcb_root,
 698                                                                mask,
 699                                                                vals);
 700
 701     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 702     vals[0] = colors.bar_fg;
 703     statusline_ctx = xcb_generate_id(xcb_connection);
 704     xcb_free_gc(xcb_connection, statusline_ctx);
 705     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 706                                                             statusline_ctx,
 707                                                             xcb_root,
 708                                                             mask,
 709                                                             vals);
 710
 711     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 712         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 713         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 714         exit(EXIT_FAILURE);
 715     }
 716
 717 }
 718
 719 /*
 720  * Reconfigure all bars and create new for newly activated outputs
 721  *
 722  */
 723 void reconfig_windows() {
 724     uint32_t mask;
 725     uint32_t values[5];
 726
 727     i3_output *walk;
 728     SLIST_FOREACH(walk, outputs, slist) {
 729         if (!walk->active) {
 730             /* If an output is not active, we destroy it's bar */
 731             /* FIXME: Maybe we rather want to unmap? */
 732             DLOG("Destroying window for output %s\n", walk->name);
 733             destroy_window(walk);
 734             continue;
 735         }
 736         if (walk->bar == XCB_NONE) {
 737             DLOG("Creating Window for output %s\n", walk->name);
 738
 739             walk->bar = xcb_generate_id(xcb_connection);
 740             walk->buffer = xcb_generate_id(xcb_connection);
 741             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 742             /* Black background */
 743             values[0] = colors.bar_bg;
 744             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
 745             values[1] = config.hide_on_modifier;
 746             /* The events we want to receive */
 747             values[2] = XCB_EVENT_MASK_EXPOSURE;
 748             if (!config.disable_ws) {
 749                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
 750             }
 751             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
 752                                                                      xcb_screen->root_depth,
 753                                                                      walk->bar,
 754                                                                      xcb_root,
 755                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
 756                                                                      walk->rect.w, font_height + 6,
 757                                                                      1,
 758                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
 759                                                                      xcb_screen->root_visual,
 760                                                                      mask,
 761                                                                      values);
 762
 763             /* The double-buffer we use to render stuff off-screen */
 764             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 765                                                                     xcb_screen->root_depth,
 766                                                                     walk->buffer,
 767                                                                     walk->bar,
 768                                                                     walk->rect.w,
 769                                                                     walk->rect.h);
 770
 771             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
 772              * this one */
 773             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
 774                                                                 XCB_PROP_MODE_REPLACE,
 775                                                                 walk->bar,
 776                                                                 atoms[_NET_WM_WINDOW_TYPE],
 777                                                                 XCB_ATOM_ATOM,
 778                                                                 32,
 779                                                                 1,
 780                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
 781
 782             /* We need to tell i3, where to reserve space for i3bar */
 783             /* left, right, top, bottom, left_start_y, left_end_y,
 784              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
 785              * bottom_end_x */
 786             /* A local struct to save the strut_partial property */
 787             struct {
 788                 uint32_t left;
 789                 uint32_t right;
 790                 uint32_t top;
 791                 uint32_t bottom;
 792                 uint32_t left_start_y;
 793                 uint32_t left_end_y;
 794                 uint32_t right_start_y;
 795                 uint32_t right_end_y;
 796                 uint32_t top_start_x;
 797                 uint32_t top_end_x;
 798                 uint32_t bottom_start_x;
 799                 uint32_t bottom_end_x;
 800             } __attribute__((__packed__)) strut_partial = {0,};
 801             switch (config.dockpos) {
 802                 case DOCKPOS_NONE:
 803                     break;
 804                 case DOCKPOS_TOP:
 805                     strut_partial.top = font_height + 6;
 806                     strut_partial.top_start_x = walk->rect.x;
 807                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
 808                     break;
 809                 case DOCKPOS_BOT:
 810                     strut_partial.bottom = font_height + 6;
 811                     strut_partial.bottom_start_x = walk->rect.x;
 812                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
 813                     break;
 814             }
 815             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
 816                                                                  XCB_PROP_MODE_REPLACE,
 817                                                                  walk->bar,
 818                                                                  atoms[_NET_WM_STRUT_PARTIAL],
 819                                                                  XCB_ATOM_CARDINAL,
 820                                                                  32,
 821                                                                  12,
 822                                                                  &strut_partial);
 823
 824             /* We also want a graphics-context for the bars (it defines the properties
 825              * with which we draw to them) */
 826             walk->bargc = xcb_generate_id(xcb_connection);
 827             mask = XCB_GC_FONT;
 828             values[0] = xcb_font;
 829             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
 830                                                                 walk->bargc,
 831                                                                 walk->bar,
 832                                                                 mask,
 833                                                                 values);
 834
 835             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
 836             xcb_void_cookie_t map_cookie;
 837             if (!config.hide_on_modifier) {
 838                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
 839             }
 840
 841             if (xcb_request_failed(win_cookie,   "Could not create window") ||
 842                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
 843                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
 844                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
 845                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
 846                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
 847                 exit(EXIT_FAILURE);
 848             }
 849         } else {
 850             /* We already have a bar, so we just reconfigure it */
 851             mask = XCB_CONFIG_WINDOW_X |
 852                    XCB_CONFIG_WINDOW_Y |
 853                    XCB_CONFIG_WINDOW_WIDTH |
 854                    XCB_CONFIG_WINDOW_HEIGHT |
 855                    XCB_CONFIG_WINDOW_STACK_MODE;
 856             values[0] = walk->rect.x;
 857             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 858             values[2] = walk->rect.w;
 859             values[3] = font_height + 6;
 860             values[4] = XCB_STACK_MODE_ABOVE;
 861
 862             DLOG("Destroying buffer for output %s", walk->name);
 863             xcb_free_pixmap(xcb_connection, walk->buffer);
 864
 865             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 866             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
 867                                                                         walk->bar,
 868                                                                         mask,
 869                                                                         values);
 870
 871             DLOG("Recreating buffer for output %s", walk->name);
 872             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 873                                                                     xcb_screen->root_depth,
 874                                                                     walk->buffer,
 875                                                                     walk->bar,
 876                                                                     walk->rect.w,
 877                                                                     walk->rect.h);
 878
 879             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
 880                 exit(EXIT_FAILURE);
 881             }
 882             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
 883                 exit(EXIT_FAILURE);
 884             }
 885         }
 886     }
 887 }
 888
 889 /*
 890  * Render the bars, with buttons and statusline
 891  *
 892  */
 893 void draw_bars() {
 894     DLOG("Drawing Bars...\n");
 895     int i = 0;
 896
 897     refresh_statusline();
 898
 899     i3_output *outputs_walk;
 900     SLIST_FOREACH(outputs_walk, outputs, slist) {
 901         if (!outputs_walk->active) {
 902             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
 903             continue;
 904         }
 905         if (outputs_walk->bar == XCB_NONE) {
 906             /* Oh shit, an active output without an own bar. Create it now! */
 907             reconfig_windows();
 908         }
 909         /* First things first: clear the backbuffer */
 910         uint32_t color = colors.bar_bg;
 911         xcb_change_gc(xcb_connection,
 912                       outputs_walk->bargc,
 913                       XCB_GC_FOREGROUND,
 914                       &color);
 915         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
 916         xcb_poly_fill_rectangle(xcb_connection,
 917                                 outputs_walk->buffer,
 918                                 outputs_walk->bargc,
 919                                 1,
 920                                 &rect);
 921
 922         if (statusline != NULL) {
 923             DLOG("Printing statusline!\n");
 924
 925             /* Luckily we already prepared a seperate pixmap containing the rendered
 926              * statusline, we just have to copy the relevant parts to the relevant
 927              * position */
 928             xcb_copy_area(xcb_connection,
 929                           statusline_pm,
 930                           outputs_walk->buffer,
 931                           outputs_walk->bargc,
 932                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
 933                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - 4)), 3,
 934                           MIN(outputs_walk->rect.w - 4, statusline_width), font_height);
 935         }
 936
 937         if (config.disable_ws) {
 938             continue;
 939         }
 940
 941         i3_ws *ws_walk;
 942         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
 943             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
 944             uint32_t fg_color = colors.inactive_ws_fg;
 945             uint32_t bg_color = colors.inactive_ws_bg;
 946             if (ws_walk->visible) {
 947                 if (!ws_walk->focused) {
 948                     fg_color = colors.active_ws_fg;
 949                     bg_color = colors.active_ws_bg;
 950                 } else {
 951                     fg_color = colors.focus_ws_fg;
 952                     bg_color = colors.focus_ws_bg;
 953                 }
 954             }
 955             if (ws_walk->urgent) {
 956                 DLOG("WS %s is urgent!\n", ws_walk->name);
 957                 fg_color = colors.urgent_ws_fg;
 958                 bg_color = colors.urgent_ws_bg;
 959                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
 960                 unhide_bars();
 961             }
 962             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
 963             uint32_t vals[] = { bg_color, bg_color };
 964             xcb_change_gc(xcb_connection,
 965                           outputs_walk->bargc,
 966                           mask,
 967                           vals);
 968             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
 969             xcb_poly_fill_rectangle(xcb_connection,
 970                                     outputs_walk->buffer,
 971                                     outputs_walk->bargc,
 972                                     1,
 973                                     &rect);
 974             xcb_change_gc(xcb_connection,
 975                           outputs_walk->bargc,
 976                           XCB_GC_FOREGROUND,
 977                           &fg_color);
 978             xcb_image_text_16(xcb_connection,
 979                               ws_walk->name_glyphs,
 980                               outputs_walk->buffer,
 981                               outputs_walk->bargc,
 982                               i + 5, font_info->font_ascent + 2,
 983                               ws_walk->ucs2_name);
 984             i += 10 + ws_walk->name_width;
 985         }
 986
 987         i = 0;
 988     }
 989
 990     redraw_bars();
 991 }
 992
 993 /*
 994  * Redraw the bars, i.e. simply copy the buffer to the barwindow
 995  *
 996  */
 997 void redraw_bars() {
 998     i3_output *outputs_walk;
 999     SLIST_FOREACH(outputs_walk, outputs, slist) {
1000         if (!outputs_walk->active) {
1001             continue;
1002         }
1003         xcb_copy_area(xcb_connection,
1004                       outputs_walk->buffer,
1005                       outputs_walk->bar,
1006                       outputs_walk->bargc,
1007                       0, 0,
1008                       0, 0,
1009                       outputs_walk->rect.w,
1010                       outputs_walk->rect.h);
1011         xcb_flush(xcb_connection);
1012     }
1013 }