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   1 /*
   2  * i3bar - an xcb-based status- and ws-bar for i3
   3  *
   4  * © 2010 Axel Wagner and contributors
   5  *
   6  * See file LICNSE for license information
   7  *
   8  * src/xcb.c: Communicating with X
   9  *
  10  */
  11 #include <xcb/xcb.h>
  12 #include <xcb/xproto.h>
  13 #include <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
  23 #include <X11/Xlib.h>
  24 #include <X11/XKBlib.h>
  25 #include <X11/extensions/XKB.h>
  26
  27 #include "common.h"
  28
  29 /* We save the Atoms in an easy to access array, indexed by an enum */
  30 #define NUM_ATOMS 3
  31
  32 enum {
  33     #define ATOM_DO(name) name,
  34     #include "xcb_atoms.def"
  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;
  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_pixmap_t     statusline_pm;
  60 uint32_t         statusline_width;
  61
  62 /* Event-Watchers, to interact with the user */
  63 ev_prepare *xcb_prep;
  64 ev_check   *xcb_chk;
  65 ev_io      *xcb_io;
  66 ev_io      *xkb_io;
  67
  68 /* The parsed colors */
  69 struct xcb_colors_t {
  70     uint32_t bar_fg;
  71     uint32_t bar_bg;
  72     uint32_t active_ws_fg;
  73     uint32_t active_ws_bg;
  74     uint32_t inactive_ws_fg;
  75     uint32_t inactive_ws_bg;
  76     uint32_t urgent_ws_bg;
  77     uint32_t urgent_ws_fg;
  78 };
  79 struct xcb_colors_t colors;
  80
  81 /* We define xcb_request_failed as a macro to include the relevant line-number */
  82 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
  83 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
  84     xcb_generic_error_t *err;
  85     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
  86         ELOG("%s. X Error Code: %d\n", err_msg, err->error_code);
  87         return err->error_code;
  88     }
  89     return 0;
  90 }
  91
  92 /*
  93  * Predicts the length of text based on cached data.
  94  * The string has to be encoded in ucs2 and glyph_len has to be the length
  95  * of the string (in glyphs).
  96  *
  97  */
  98 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
  99     /* If we don't have per-character data, return the maximum width */
 100     if (font_table == NULL) {
 101         return (font_info->max_bounds.character_width * length);
 102     }
 103
 104     uint32_t width = 0;
 105     uint32_t i;
 106
 107     for (i = 0; i < length; i++) {
 108         xcb_charinfo_t *info;
 109         int row = text[i].byte1;
 110         int col = text[i].byte2;
 111
 112         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 113             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 114             continue;
 115         }
 116
 117         /* Don't you ask me, how this one works… */
 118         info = &font_table[((row - font_info->min_byte1) *
 119                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 120                            (col - font_info->min_char_or_byte2)];
 121
 122         if (info->character_width != 0 ||
 123             (info->right_side_bearing |
 124              info->left_side_bearing |
 125              info->ascent |
 126              info->descent) != 0) {
 127             width += info->character_width;
 128         }
 129     }
 130
 131     return width;
 132 }
 133
 134 /*
 135  * Draws text given in UCS-2-encoding to a given drawable and position
 136  *
 137  */
 138 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 139                xcb_char2b_t *text, uint32_t glyph_count) {
 140     int offset = 0;
 141     int16_t pos_x = x;
 142     int16_t font_ascent = font_info->font_ascent;
 143
 144     while (glyph_count > 0) {
 145         uint8_t chunk_size = MIN(255, glyph_count);
 146         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 147
 148         xcb_image_text_16(xcb_connection,
 149                           chunk_size,
 150                           drawable,
 151                           ctx,
 152                           pos_x, y + font_ascent,
 153                           text + offset);
 154
 155         offset += chunk_size;
 156         pos_x += chunk_width;
 157         glyph_count -= chunk_size;
 158     }
 159 }
 160
 161 /*
 162  * Converts a colorstring to a colorpixel as expected from xcb_change_gc.
 163  * s is assumed to be in the format "rrggbb"
 164  *
 165  */
 166 uint32_t get_colorpixel(const char *s) {
 167     char strings[3][3] = { { s[0], s[1], '\0'} ,
 168                            { s[2], s[3], '\0'} ,
 169                            { s[4], s[5], '\0'} };
 170     uint8_t r = strtol(strings[0], NULL, 16);
 171     uint8_t g = strtol(strings[1], NULL, 16);
 172     uint8_t b = strtol(strings[2], NULL, 16);
 173     return (r << 16 | g << 8 | b);
 174 }
 175
 176 /*
 177  * Redraws the statusline to the buffer
 178  *
 179  */
 180 void refresh_statusline() {
 181     int glyph_count;
 182
 183     if (statusline == NULL) {
 184         return;
 185     }
 186
 187     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 188     statusline_width = predict_text_extents(text, glyph_count);
 189
 190     xcb_free_pixmap(xcb_connection, statusline_pm);
 191     statusline_pm = xcb_generate_id(xcb_connection);
 192     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 193                                                                xcb_screen->root_depth,
 194                                                                statusline_pm,
 195                                                                xcb_root,
 196                                                                statusline_width,
 197                                                                font_height);
 198
 199     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 200
 201     FREE(text);
 202
 203     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer")) {
 204         exit(EXIT_FAILURE);
 205     }
 206 }
 207
 208 /*
 209  * Hides all bars (unmaps them)
 210  *
 211  */
 212 void hide_bars() {
 213     if (!config.hide_on_modifier) {
 214         return;
 215     }
 216
 217     i3_output *walk;
 218     SLIST_FOREACH(walk, outputs, slist) {
 219         xcb_unmap_window(xcb_connection, walk->bar);
 220     }
 221     stop_child();
 222 }
 223
 224 /*
 225  * Unhides all bars (maps them)
 226  *
 227  */
 228 void unhide_bars() {
 229     if (!config.hide_on_modifier) {
 230         return;
 231     }
 232
 233     i3_output           *walk;
 234     xcb_void_cookie_t   cookie;
 235     uint32_t            mask;
 236     uint32_t            values[5];
 237
 238     cont_child();
 239
 240     SLIST_FOREACH(walk, outputs, slist) {
 241         if (walk->bar == XCB_NONE) {
 242             continue;
 243         }
 244         mask = XCB_CONFIG_WINDOW_X |
 245                XCB_CONFIG_WINDOW_Y |
 246                XCB_CONFIG_WINDOW_WIDTH |
 247                XCB_CONFIG_WINDOW_HEIGHT |
 248                XCB_CONFIG_WINDOW_STACK_MODE;
 249         values[0] = walk->rect.x;
 250         values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 251         values[2] = walk->rect.w;
 252         values[3] = font_height + 6;
 253         values[4] = XCB_STACK_MODE_ABOVE;
 254         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 255         cookie = xcb_configure_window_checked(xcb_connection,
 256                                               walk->bar,
 257                                               mask,
 258                                               values);
 259
 260         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 261             exit(EXIT_FAILURE);
 262         }
 263         xcb_map_window(xcb_connection, walk->bar);
 264     }
 265 }
 266
 267 /*
 268  * Parse the colors into a format that we can use
 269  *
 270  */
 271 void init_colors(const struct xcb_color_strings_t *new_colors) {
 272 #define PARSE_COLOR(name, def) \
 273     do { \
 274         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 275     } while  (0)
 276     PARSE_COLOR(bar_fg, "FFFFFF");
 277     PARSE_COLOR(bar_bg, "000000");
 278     PARSE_COLOR(active_ws_fg, "FFFFFF");
 279     PARSE_COLOR(active_ws_bg, "480000");
 280     PARSE_COLOR(inactive_ws_fg, "FFFFFF");
 281     PARSE_COLOR(inactive_ws_bg, "240000");
 282     PARSE_COLOR(urgent_ws_fg, "FFFFFF");
 283     PARSE_COLOR(urgent_ws_bg, "002400");
 284 #undef PARSE_COLOR
 285 }
 286
 287 /*
 288  * Handle a button-press-event (i.c. a mouse click on one of our bars).
 289  * We determine, wether the click occured on a ws-button or if the scroll-
 290  * wheel was used and change the workspace appropriately
 291  *
 292  */
 293 void handle_button(xcb_button_press_event_t *event) {
 294     i3_ws *cur_ws;
 295
 296     /* Determine, which bar was clicked */
 297     i3_output *walk;
 298     xcb_window_t bar = event->event;
 299     SLIST_FOREACH(walk, outputs, slist) {
 300         if (walk->bar == bar) {
 301             break;
 302         }
 303     }
 304
 305     if (walk == NULL) {
 306         DLOG("Unknown Bar klicked!\n");
 307         return;
 308     }
 309
 310     /* TODO: Move this to extern get_ws_for_output() */
 311     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 312         if (cur_ws->visible) {
 313             break;
 314         }
 315     }
 316
 317     if (cur_ws == NULL) {
 318         DLOG("No Workspace active?\n");
 319         return;
 320     }
 321
 322     int32_t x = event->event_x;
 323
 324     DLOG("Got Button %d\n", event->detail);
 325
 326     switch (event->detail) {
 327         case 1:
 328             /* Left Mousbutton. We determine, which button was clicked
 329              * and set cur_ws accordingly */
 330             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 331                 DLOG("x = %d\n", x);
 332                 if (x < cur_ws->name_width + 10) {
 333                     break;
 334                 }
 335                 x -= cur_ws->name_width + 10;
 336             }
 337             if (cur_ws == NULL) {
 338                 return;
 339             }
 340             break;
 341         case 4:
 342             /* Mouse wheel down. We select the next ws */
 343             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 344                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 345             } else {
 346                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 347             }
 348             break;
 349         case 5:
 350             /* Mouse wheel up. We select the previos ws */
 351             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 352                 cur_ws = TAILQ_FIRST(walk->workspaces);
 353             } else {
 354                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 355             }
 356             break;
 357     }
 358
 359     char buffer[strlen(cur_ws->name) + 11];
 360     snprintf(buffer, 50, "workspace %s", cur_ws->name);
 361     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 362 }
 363
 364 /*
 365  * This function is called immediately bevor the main loop locks. We flush xcb
 366  * then (and only then)
 367  *
 368  */
 369 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 370     xcb_flush(xcb_connection);
 371 }
 372
 373 /*
 374  * This function is called immediately after the main loop locks, so when one
 375  * of the watchers registered an event.
 376  * We check wether an X-Event arrived and handle it.
 377  *
 378  */
 379 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 380     xcb_generic_event_t *event;
 381     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 382         return;
 383     }
 384
 385     switch (event->response_type & ~0x80) {
 386         case XCB_EXPOSE:
 387             /* Expose-events happen, when the window needs to be redrawn */
 388             redraw_bars();
 389             break;
 390         case XCB_BUTTON_PRESS:
 391             /* Button-press-events are mouse-buttons clicked on one of our bars */
 392             handle_button((xcb_button_press_event_t*) event);
 393             break;
 394     }
 395     FREE(event);
 396 }
 397
 398 /*
 399  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 400  * are triggered
 401  *
 402  */
 403 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 404 }
 405
 406 /*
 407  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 408  *
 409  */
 410 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 411     XkbEvent ev;
 412     int modstate;
 413
 414     DLOG("Got XKB-Event!\n");
 415
 416     while (XPending(xkb_dpy)) {
 417         XNextEvent(xkb_dpy, (XEvent*)&ev);
 418
 419         if (ev.type != xkb_event_base) {
 420             ELOG("No Xkb-Event!\n");
 421             continue;
 422         }
 423
 424         if (ev.any.xkb_type != XkbStateNotify) {
 425             ELOG("No State Notify!\n");
 426             continue;
 427         }
 428
 429         unsigned int mods = ev.state.mods;
 430         modstate = mods & Mod4Mask;
 431     }
 432
 433     if (modstate != mod_pressed) {
 434         if (modstate == 0) {
 435             DLOG("Mod4 got released!\n");
 436             hide_bars();
 437         } else {
 438             DLOG("Mod4 got pressed!\n");
 439             unhide_bars();
 440         }
 441         mod_pressed = modstate;
 442     }
 443 }
 444
 445 /*
 446  * Initialize xcb and use the specified fontname for text-rendering
 447  *
 448  */
 449 void init_xcb(char *fontname) {
 450     /* FIXME: xcb_connect leaks Memory */
 451     xcb_connection = xcb_connect(NULL, NULL);
 452     if (xcb_connection_has_error(xcb_connection)) {
 453         ELOG("Cannot open display\n");
 454         exit(EXIT_FAILURE);
 455     }
 456     DLOG("Connected to xcb\n");
 457
 458     /* We have to request the atoms we need */
 459     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 460     #include "xcb_atoms.def"
 461
 462     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 463     xcb_root = xcb_screen->root;
 464
 465     /* We load and allocate the font */
 466     xcb_font = xcb_generate_id(xcb_connection);
 467     xcb_void_cookie_t open_font_cookie;
 468     open_font_cookie = xcb_open_font_checked(xcb_connection,
 469                                              xcb_font,
 470                                              strlen(fontname),
 471                                              fontname);
 472
 473     /* We need to save info about the font, because we need the fonts height and
 474      * information about the width of characters */
 475     xcb_query_font_cookie_t query_font_cookie;
 476     query_font_cookie = xcb_query_font(xcb_connection,
 477                                        xcb_font);
 478
 479     /* To grab modifiers without blocking other applications from receiving key-events
 480      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 481      * in xcb */
 482     if (config.hide_on_modifier) {
 483         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 484         xkb_major = XkbMajorVersion;
 485         xkb_minor = XkbMinorVersion;
 486
 487         xkb_dpy = XkbOpenDisplay(":0",
 488                                  &xkb_event_base,
 489                                  &xkb_errbase,
 490                                  &xkb_major,
 491                                  &xkb_minor,
 492                                  &xkb_err);
 493
 494         if (xkb_dpy == NULL) {
 495             ELOG("No XKB!\n");
 496             exit(EXIT_FAILURE);
 497         }
 498
 499         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 500             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 501             exit(EXIT_FAILURE);
 502         }
 503
 504         int i1;
 505         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 506             ELOG("XKB not supported by X-server!\n");
 507             exit(EXIT_FAILURE);
 508         }
 509
 510         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 511             ELOG("Could not grab Key!\n");
 512             exit(EXIT_FAILURE);
 513         }
 514
 515         xkb_io = malloc(sizeof(ev_io));
 516         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 517         ev_io_start(main_loop, xkb_io);
 518         XFlush(xkb_dpy);
 519     }
 520
 521     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 522      * this way, we can choose to crop it */
 523     statusline_ctx = xcb_generate_id(xcb_connection);
 524     uint32_t mask = XCB_GC_FOREGROUND |
 525                     XCB_GC_BACKGROUND |
 526                     XCB_GC_FONT;
 527     uint32_t vals[3] = { colors.bar_fg, colors.bar_bg, xcb_font };
 528
 529     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 530                                                             statusline_ctx,
 531                                                             xcb_root,
 532                                                             mask,
 533                                                             vals);
 534
 535     /* We only generate an id for the pixmap, because the width of it is dependent on the
 536      * input we get */
 537     statusline_pm = xcb_generate_id(xcb_connection);
 538
 539     /* The varios Watchers to communicate with xcb */
 540     xcb_io = malloc(sizeof(ev_io));
 541     xcb_prep = malloc(sizeof(ev_prepare));
 542     xcb_chk = malloc(sizeof(ev_check));
 543
 544     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 545     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 546     ev_check_init(xcb_chk, &xcb_chk_cb);
 547
 548     ev_io_start(main_loop, xcb_io);
 549     ev_prepare_start(main_loop, xcb_prep);
 550     ev_check_start(main_loop, xcb_chk);
 551
 552     /* Now we get the atoms and save them in a nice data-structure */
 553     get_atoms();
 554
 555     /* Now we save the font-infos */
 556     font_info = xcb_query_font_reply(xcb_connection,
 557                                      query_font_cookie,
 558                                      NULL);
 559
 560     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 561         exit(EXIT_FAILURE);
 562     }
 563
 564     font_height = font_info->font_ascent + font_info->font_descent;
 565
 566     if (xcb_query_font_char_infos_length(font_info) == 0) {
 567         font_table = NULL;
 568     } else {
 569         font_table = xcb_query_font_char_infos(font_info);
 570     }
 571
 572     DLOG("Calculated Font-height: %d\n", font_height);
 573
 574     if (xcb_request_failed(sl_ctx_cookie, "Could not create context for statusline")) {
 575         exit(EXIT_FAILURE);
 576     }
 577 }
 578
 579 /*
 580  * Cleanup the xcb-stuff.
 581  * Called once, before the program terminates.
 582  *
 583  */
 584 void clean_xcb() {
 585     i3_output *o_walk;
 586     free_workspaces();
 587     SLIST_FOREACH(o_walk, outputs, slist) {
 588         destroy_window(o_walk);
 589         FREE(o_walk->workspaces);
 590         FREE(o_walk->name);
 591     }
 592     FREE_SLIST(outputs, i3_output);
 593     FREE(outputs);
 594
 595     xcb_disconnect(xcb_connection);
 596
 597     ev_check_stop(main_loop, xcb_chk);
 598     ev_prepare_stop(main_loop, xcb_prep);
 599     ev_io_stop(main_loop, xcb_io);
 600
 601     FREE(xcb_chk);
 602     FREE(xcb_prep);
 603     FREE(xcb_io);
 604     FREE(font_info);
 605 }
 606
 607 /*
 608  * Get the earlier requested atoms and save them in the prepared data-structure
 609  *
 610  */
 611 void get_atoms() {
 612     xcb_intern_atom_reply_t *reply;
 613     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
 614         if (reply == NULL) { \
 615             ELOG("Could not get atom %s\n", #name); \
 616             exit(EXIT_FAILURE); \
 617         } \
 618         atoms[name] = reply->atom; \
 619         free(reply);
 620
 621     #include "xcb_atoms.def"
 622     DLOG("Got Atoms\n");
 623 }
 624
 625 /*
 626  * Destroy the bar of the specified output
 627  *
 628  */
 629 void destroy_window(i3_output *output) {
 630     if (output == NULL) {
 631         return;
 632     }
 633     if (output->bar == XCB_NONE) {
 634         return;
 635     }
 636     xcb_destroy_window(xcb_connection, output->bar);
 637     output->bar = XCB_NONE;
 638 }
 639
 640 /*
 641  * Reconfigure all bars and create new for newly activated outputs
 642  *
 643  */
 644 void reconfig_windows() {
 645     uint32_t mask;
 646     uint32_t values[5];
 647
 648     i3_output *walk;
 649     SLIST_FOREACH(walk, outputs, slist) {
 650         if (!walk->active) {
 651             /* If an output is not active, we destroy it's bar */
 652             /* FIXME: Maybe we rather want to unmap? */
 653             DLOG("Destroying window for output %s\n", walk->name);
 654             destroy_window(walk);
 655             continue;
 656         }
 657         if (walk->bar == XCB_NONE) {
 658             DLOG("Creating Window for output %s\n", walk->name);
 659
 660             walk->bar = xcb_generate_id(xcb_connection);
 661             walk->buffer = xcb_generate_id(xcb_connection);
 662             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 663             /* Black background */
 664             values[0] = colors.bar_bg;
 665             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
 666             values[1] = config.hide_on_modifier;
 667             /* The events we want to receive */
 668             values[2] = XCB_EVENT_MASK_EXPOSURE |
 669                         XCB_EVENT_MASK_BUTTON_PRESS;
 670             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
 671                                                                      xcb_screen->root_depth,
 672                                                                      walk->bar,
 673                                                                      xcb_root,
 674                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
 675                                                                      walk->rect.w, font_height + 6,
 676                                                                      1,
 677                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
 678                                                                      xcb_screen->root_visual,
 679                                                                      mask,
 680                                                                      values);
 681
 682             /* The double-buffer we use to render stuff off-screen */
 683             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 684                                                                     xcb_screen->root_depth,
 685                                                                     walk->buffer,
 686                                                                     walk->bar,
 687                                                                     walk->rect.w,
 688                                                                     walk->rect.h);
 689
 690             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
 691              * this one */
 692             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
 693                                                                 XCB_PROP_MODE_REPLACE,
 694                                                                 walk->bar,
 695                                                                 atoms[_NET_WM_WINDOW_TYPE],
 696                                                                 XCB_ATOM_ATOM,
 697                                                                 32,
 698                                                                 1,
 699                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
 700
 701             /* We need to tell i3, where to reserve space for i3bar */
 702             /* left, right, top, bottom, left_start_y, left_end_y,
 703              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
 704              * bottom_end_x */
 705             /* A local struct to save the strut_partial property */
 706             struct {
 707                 uint32_t left;
 708                 uint32_t right;
 709                 uint32_t top;
 710                 uint32_t bottom;
 711                 uint32_t left_start_y;
 712                 uint32_t left_end_y;
 713                 uint32_t right_start_y;
 714                 uint32_t right_end_y;
 715                 uint32_t top_start_x;
 716                 uint32_t top_end_x;
 717                 uint32_t bottom_start_x;
 718                 uint32_t bottom_end_x;
 719             } __attribute__((__packed__)) strut_partial = {0,};
 720             switch (config.dockpos) {
 721                 case DOCKPOS_NONE:
 722                     break;
 723                 case DOCKPOS_TOP:
 724                     strut_partial.top = font_height + 6;
 725                     strut_partial.top_start_x = walk->rect.x;
 726                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
 727                     break;
 728                 case DOCKPOS_BOT:
 729                     strut_partial.bottom = font_height + 6;
 730                     strut_partial.bottom_start_x = walk->rect.x;
 731                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
 732                     break;
 733             }
 734             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
 735                                                                  XCB_PROP_MODE_REPLACE,
 736                                                                  walk->bar,
 737                                                                  atoms[_NET_WM_STRUT_PARTIAL],
 738                                                                  XCB_ATOM_CARDINAL,
 739                                                                  32,
 740                                                                  12,
 741                                                                  &strut_partial);
 742
 743             /* We also want a graphics-context for the bars (it defines the properties
 744              * with which we draw to them) */
 745             walk->bargc = xcb_generate_id(xcb_connection);
 746             mask = XCB_GC_FONT;
 747             values[0] = xcb_font;
 748             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
 749                                                                 walk->bargc,
 750                                                                 walk->bar,
 751                                                                 mask,
 752                                                                 values);
 753
 754             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
 755             xcb_void_cookie_t map_cookie;
 756             if (!config.hide_on_modifier) {
 757                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
 758             }
 759
 760             if (xcb_request_failed(win_cookie,   "Could not create window") ||
 761                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
 762                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
 763                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
 764                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
 765                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
 766                 exit(EXIT_FAILURE);
 767             }
 768         } else {
 769             /* We already have a bar, so we just reconfigure it */
 770             mask = XCB_CONFIG_WINDOW_X |
 771                    XCB_CONFIG_WINDOW_Y |
 772                    XCB_CONFIG_WINDOW_WIDTH |
 773                    XCB_CONFIG_WINDOW_HEIGHT |
 774                    XCB_CONFIG_WINDOW_STACK_MODE;
 775             values[0] = walk->rect.x;
 776             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 777             values[2] = walk->rect.w;
 778             values[3] = font_height + 6;
 779             values[4] = XCB_STACK_MODE_ABOVE;
 780
 781             DLOG("Destroying buffer for output %s", walk->name);
 782             xcb_free_pixmap(xcb_connection, walk->buffer);
 783
 784             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 785             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
 786                                                                         walk->bar,
 787                                                                         mask,
 788                                                                         values);
 789
 790             DLOG("Recreating buffer for output %s", walk->name);
 791             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 792                                                                     xcb_screen->root_depth,
 793                                                                     walk->buffer,
 794                                                                     walk->bar,
 795                                                                     walk->rect.w,
 796                                                                     walk->rect.h);
 797
 798             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
 799                 exit(EXIT_FAILURE);
 800             }
 801             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
 802                 exit(EXIT_FAILURE);
 803             }
 804         }
 805     }
 806 }
 807
 808 /*
 809  * Render the bars, with buttons and statusline
 810  *
 811  */
 812 void draw_bars() {
 813     DLOG("Drawing Bars...\n");
 814     int i = 0;
 815
 816     refresh_statusline();
 817
 818     i3_output *outputs_walk;
 819     SLIST_FOREACH(outputs_walk, outputs, slist) {
 820         if (!outputs_walk->active) {
 821             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
 822             continue;
 823         }
 824         if (outputs_walk->bar == XCB_NONE) {
 825             /* Oh shit, an active output without an own bar. Create it now! */
 826             reconfig_windows();
 827         }
 828         /* First things first: clear the backbuffer */
 829         uint32_t color = colors.bar_bg;
 830         xcb_change_gc(xcb_connection,
 831                       outputs_walk->bargc,
 832                       XCB_GC_FOREGROUND,
 833                       &color);
 834         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
 835         xcb_poly_fill_rectangle(xcb_connection,
 836                                 outputs_walk->buffer,
 837                                 outputs_walk->bargc,
 838                                 1,
 839                                 &rect);
 840
 841         if (statusline != NULL) {
 842             DLOG("Printing statusline!\n");
 843
 844             /* Luckily we already prepared a seperate pixmap containing the rendered
 845              * statusline, we just have to copy the relevant parts to the relevant
 846              * position */
 847             xcb_copy_area(xcb_connection,
 848                           statusline_pm,
 849                           outputs_walk->buffer,
 850                           outputs_walk->bargc,
 851                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
 852                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - 4)), 3,
 853                           MIN(outputs_walk->rect.w - 4, statusline_width), font_height);
 854         }
 855
 856         i3_ws *ws_walk;
 857         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
 858             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
 859             uint32_t fg_color = colors.inactive_ws_fg;
 860             uint32_t bg_color = colors.inactive_ws_bg;
 861             if (ws_walk->visible) {
 862                 fg_color = colors.active_ws_fg;
 863                 bg_color = colors.active_ws_bg;
 864             }
 865             if (ws_walk->urgent) {
 866                 DLOG("WS %s is urgent!\n", ws_walk->name);
 867                 fg_color = colors.urgent_ws_fg;
 868                 bg_color = colors.urgent_ws_bg;
 869                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
 870                 unhide_bars();
 871             }
 872             xcb_change_gc(xcb_connection,
 873                           outputs_walk->bargc,
 874                           XCB_GC_FOREGROUND,
 875                           &bg_color);
 876             xcb_change_gc(xcb_connection,
 877                           outputs_walk->bargc,
 878                           XCB_GC_BACKGROUND,
 879                           &bg_color);
 880             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
 881             xcb_poly_fill_rectangle(xcb_connection,
 882                                     outputs_walk->buffer,
 883                                     outputs_walk->bargc,
 884                                     1,
 885                                     &rect);
 886             xcb_change_gc(xcb_connection,
 887                           outputs_walk->bargc,
 888                           XCB_GC_FOREGROUND,
 889                           &fg_color);
 890             xcb_image_text_16(xcb_connection,
 891                               ws_walk->name_glyphs,
 892                               outputs_walk->buffer,
 893                               outputs_walk->bargc,
 894                               i + 5, font_info->font_ascent + 2,
 895                               ws_walk->ucs2_name);
 896             i += 10 + ws_walk->name_width;
 897         }
 898
 899         redraw_bars();
 900
 901         i = 0;
 902     }
 903 }
 904
 905 /*
 906  * Redraw the bars, i.e. simply copy the buffer to the barwindow
 907  *
 908  */
 909 void redraw_bars() {
 910     i3_output *outputs_walk;
 911     SLIST_FOREACH(outputs_walk, outputs, slist) {
 912         xcb_copy_area(xcb_connection,
 913                       outputs_walk->buffer,
 914                       outputs_walk->bar,
 915                       outputs_walk->bargc,
 916                       0, 0,
 917                       0, 0,
 918                       outputs_walk->rect.w,
 919                       outputs_walk->rect.h);
 920         xcb_flush(xcb_connection);
 921     }
 922 }