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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 <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <string.h>
  18 #include <i3/ipc.h>
  19 #include <ev.h>
  20
  21 #include <X11/Xlib.h>
  22 #include <X11/XKBlib.h>
  23 #include <X11/extensions/XKB.h>
  24
  25 #include "common.h"
  26
  27 /* We save the Atoms in an easy to access array, indexed by an enum */
  28 #define NUM_ATOMS 3
  29
  30 enum {
  31     #define ATOM_DO(name) name,
  32     #include "xcb_atoms.def"
  33 };
  34
  35 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  36 xcb_atom_t               atoms[NUM_ATOMS];
  37
  38 /* Variables, that are the same for all functions at all times */
  39 xcb_connection_t *xcb_connection;
  40 xcb_screen_t     *xcb_screen;
  41 xcb_window_t     xcb_root;
  42 xcb_font_t       xcb_font;
  43
  44 /* We need to cache some data to speed up text-width-prediction */
  45 xcb_query_font_reply_t *font_info;
  46 int                    font_height;
  47 xcb_charinfo_t         *font_table;
  48
  49 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  50 Display          *xkb_dpy;
  51 int              xkb_event_base;
  52 int              mod_pressed;
  53
  54 /* Because the statusline is the same on all outputs, we have
  55  * global buffer to render it on */
  56 xcb_gcontext_t   statusline_ctx;
  57 xcb_pixmap_t     statusline_pm;
  58 uint32_t         statusline_width;
  59
  60 /* Event-Watchers, to interact with the user */
  61 ev_prepare *xcb_prep;
  62 ev_check   *xcb_chk;
  63 ev_io      *xcb_io;
  64 ev_io      *xkb_io;
  65
  66 /* The parsed colors */
  67 struct xcb_colors_t {
  68     uint32_t bar_fg;
  69     uint32_t bar_bg;
  70     uint32_t active_ws_fg;
  71     uint32_t active_ws_bg;
  72     uint32_t inactive_ws_fg;
  73     uint32_t inactive_ws_bg;
  74     uint32_t urgent_ws_bg;
  75     uint32_t urgent_ws_fg;
  76 };
  77 struct xcb_colors_t colors;
  78
  79 /* We define xcb_request_failed as a macro to include the relevant line-number */
  80 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
  81 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
  82     xcb_generic_error_t *err;
  83     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
  84         ELOG("%s. X Error Code: %d\n", err_msg, err->error_code);
  85         return err->error_code;
  86     }
  87     return 0;
  88 }
  89
  90 /*
  91  * Predicts the length of text based on cached data.
  92  * The string has to be encoded in ucs2 and glyph_len has to be the length
  93  * of the string (in glyphs).
  94  *
  95  */
  96 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
  97     /* If we don't have per-character data, return the maximum width */
  98     if (font_table == NULL) {
  99         return (font_info->max_bounds.character_width * length);
 100     }
 101
 102     uint32_t width = 0;
 103     uint32_t i;
 104
 105     for (i = 0; i < length; i++) {
 106         xcb_charinfo_t *info;
 107         int row = text[i].byte1;
 108         int col = text[i].byte2;
 109
 110         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 111             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 112             continue;
 113         }
 114
 115         /* Don't you ask me, how this one works… */
 116         info = &font_table[((row - font_info->min_byte1) *
 117                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 118                            (col - font_info->min_char_or_byte2)];
 119
 120         if (info->character_width != 0 ||
 121             (info->right_side_bearing |
 122              info->left_side_bearing |
 123              info->ascent |
 124              info->descent) != 0) {
 125             width += info->character_width;
 126         }
 127     }
 128
 129     return width;
 130 }
 131
 132 /*
 133  * Draws text given in UCS-2-encoding to a given drawable and position
 134  *
 135  */
 136 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 137                xcb_char2b_t *text, uint32_t glyph_count) {
 138     int offset = 0;
 139     int16_t pos_x = x;
 140     int16_t font_ascent = font_info->font_ascent;
 141
 142     while (glyph_count > 0) {
 143         uint8_t chunk_size = MIN(255, glyph_count);
 144         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 145
 146         xcb_image_text_16(xcb_connection,
 147                           chunk_size,
 148                           drawable,
 149                           ctx,
 150                           pos_x, y + font_ascent,
 151                           text + offset);
 152
 153         offset += chunk_size;
 154         pos_x += chunk_width;
 155         glyph_count -= chunk_size;
 156     }
 157 }
 158
 159 /*
 160  * Converts a colorstring to a colorpixel as expected from xcb_change_gc.
 161  * s is assumed to be in the format "rrggbb"
 162  *
 163  */
 164 uint32_t get_colorpixel(const char *s) {
 165     char strings[3][3] = { { s[0], s[1], '\0'} ,
 166                            { s[2], s[3], '\0'} ,
 167                            { s[4], s[5], '\0'} };
 168     uint8_t r = strtol(strings[0], NULL, 16);
 169     uint8_t g = strtol(strings[1], NULL, 16);
 170     uint8_t b = strtol(strings[2], NULL, 16);
 171     return (r << 16 | g << 8 | b);
 172 }
 173
 174 /*
 175  * Redraws the statusline to the buffer
 176  *
 177  */
 178 void refresh_statusline() {
 179     int glyph_count;
 180
 181     if (statusline == NULL) {
 182         return;
 183     }
 184
 185     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 186     statusline_width = predict_text_extents(text, glyph_count);
 187
 188     xcb_free_pixmap(xcb_connection, statusline_pm);
 189     statusline_pm = xcb_generate_id(xcb_connection);
 190     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 191                                                                xcb_screen->root_depth,
 192                                                                statusline_pm,
 193                                                                xcb_root,
 194                                                                statusline_width,
 195                                                                font_height);
 196
 197     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 198
 199     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer")) {
 200         exit(EXIT_FAILURE);
 201     }
 202 }
 203
 204 /*
 205  * Hides all bars (unmaps them)
 206  *
 207  */
 208 void hide_bars() {
 209     if (!config.hide_on_modifier) {
 210         return;
 211     }
 212
 213     i3_output *walk;
 214     SLIST_FOREACH(walk, outputs, slist) {
 215         xcb_unmap_window(xcb_connection, walk->bar);
 216     }
 217     stop_child();
 218 }
 219
 220 /*
 221  * Unhides all bars (maps them)
 222  *
 223  */
 224 void unhide_bars() {
 225     if (!config.hide_on_modifier) {
 226         return;
 227     }
 228
 229     i3_output           *walk;
 230     xcb_void_cookie_t   cookie;
 231     uint32_t            mask;
 232     uint32_t            values[5];
 233
 234     cont_child();
 235
 236     SLIST_FOREACH(walk, outputs, slist) {
 237         if (walk->bar == XCB_NONE) {
 238             continue;
 239         }
 240         mask = XCB_CONFIG_WINDOW_X |
 241                XCB_CONFIG_WINDOW_Y |
 242                XCB_CONFIG_WINDOW_WIDTH |
 243                XCB_CONFIG_WINDOW_HEIGHT |
 244                XCB_CONFIG_WINDOW_STACK_MODE;
 245         values[0] = walk->rect.x;
 246         values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 247         values[2] = walk->rect.w;
 248         values[3] = font_height + 6;
 249         values[4] = XCB_STACK_MODE_ABOVE;
 250         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 251         cookie = xcb_configure_window_checked(xcb_connection,
 252                                               walk->bar,
 253                                               mask,
 254                                               values);
 255
 256         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 257             exit(EXIT_FAILURE);
 258         }
 259         xcb_map_window(xcb_connection, walk->bar);
 260     }
 261 }
 262
 263 /*
 264  * Parse the colors into a format that we can use
 265  *
 266  */
 267 void init_colors(const struct xcb_color_strings_t *new_colors) {
 268 #define PARSE_COLOR(name, def) \
 269     do { \
 270         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 271     } while  (0)
 272     PARSE_COLOR(bar_fg, "FFFFFF");
 273     PARSE_COLOR(bar_bg, "000000");
 274     PARSE_COLOR(active_ws_fg, "FFFFFF");
 275     PARSE_COLOR(active_ws_bg, "480000");
 276     PARSE_COLOR(inactive_ws_fg, "FFFFFF");
 277     PARSE_COLOR(inactive_ws_bg, "240000");
 278     PARSE_COLOR(urgent_ws_fg, "FFFFFF");
 279     PARSE_COLOR(urgent_ws_bg, "002400");
 280 #undef PARSE_COLOR
 281 }
 282
 283 /*
 284  * Handle a button-press-event (i.c. a mouse click on one of our bars).
 285  * We determine, wether the click occured on a ws-button or if the scroll-
 286  * wheel was used and change the workspace appropriately
 287  *
 288  */
 289 void handle_button(xcb_button_press_event_t *event) {
 290     i3_ws *cur_ws;
 291
 292     /* Determine, which bar was clicked */
 293     i3_output *walk;
 294     xcb_window_t bar = event->event;
 295     SLIST_FOREACH(walk, outputs, slist) {
 296         if (walk->bar == bar) {
 297             break;
 298         }
 299     }
 300
 301     if (walk == NULL) {
 302         DLOG("Unknown Bar klicked!\n");
 303         return;
 304     }
 305
 306     /* TODO: Move this to extern get_ws_for_output() */
 307     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 308         if (cur_ws->visible) {
 309             break;
 310         }
 311     }
 312
 313     if (cur_ws == NULL) {
 314         DLOG("No Workspace active?\n");
 315         return;
 316     }
 317
 318     int32_t x = event->event_x;
 319
 320     DLOG("Got Button %d\n", event->detail);
 321
 322     switch (event->detail) {
 323         case 1:
 324             /* Left Mousbutton. We determine, which button was clicked
 325              * and set cur_ws accordingly */
 326             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 327                 DLOG("x = %d\n", x);
 328                 if (x < cur_ws->name_width + 10) {
 329                     break;
 330                 }
 331                 x -= cur_ws->name_width + 10;
 332             }
 333             if (cur_ws == NULL) {
 334                 return;
 335             }
 336             break;
 337         case 4:
 338             /* Mouse wheel down. We select the next ws */
 339             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 340                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 341             } else {
 342                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 343             }
 344             break;
 345         case 5:
 346             /* Mouse wheel up. We select the previos ws */
 347             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 348                 cur_ws = TAILQ_FIRST(walk->workspaces);
 349             } else {
 350                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 351             }
 352             break;
 353     }
 354
 355     char buffer[50];
 356     snprintf(buffer, 50, "%d", cur_ws->num);
 357     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 358 }
 359
 360 /*
 361  * This function is called immediately bevor the main loop locks. We flush xcb
 362  * then (and only then)
 363  *
 364  */
 365 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revenst) {
 366     xcb_flush(xcb_connection);
 367 }
 368
 369 /*
 370  * This function is called immediately after the main loop locks, so when one
 371  * of the watchers registered an event.
 372  * We check wether an X-Event arrived and handle it.
 373  *
 374  */
 375 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 376     xcb_generic_event_t *event;
 377     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 378         return;
 379     }
 380
 381     switch (event->response_type & ~0x80) {
 382         case XCB_EXPOSE:
 383             /* Expose-events happen, when the window needs to be redrawn */
 384             redraw_bars();
 385             break;
 386         case XCB_BUTTON_PRESS:
 387             /* Button-press-events are mouse-buttons clicked on one of our bars */
 388             handle_button((xcb_button_press_event_t*) event);
 389             break;
 390     }
 391     FREE(event);
 392 }
 393
 394 /*
 395  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 396  * are triggered
 397  *
 398  */
 399 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 400 }
 401
 402 /*
 403  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 404  *
 405  */
 406 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 407     XkbEvent ev;
 408     int modstate;
 409
 410     DLOG("Got XKB-Event!\n");
 411
 412     while (XPending(xkb_dpy)) {
 413         XNextEvent(xkb_dpy, (XEvent*)&ev);
 414
 415         if (ev.type != xkb_event_base) {
 416             ELOG("No Xkb-Event!\n");
 417             continue;
 418         }
 419
 420         if (ev.any.xkb_type != XkbStateNotify) {
 421             ELOG("No State Notify!\n");
 422             continue;
 423         }
 424
 425         unsigned int mods = ev.state.mods;
 426         modstate = mods & Mod4Mask;
 427     }
 428
 429     if (modstate != mod_pressed) {
 430         if (modstate == 0) {
 431             DLOG("Mod4 got released!\n");
 432             hide_bars();
 433         } else {
 434             DLOG("Mod4 got pressed!\n");
 435             unhide_bars();
 436         }
 437         mod_pressed = modstate;
 438     }
 439 }
 440
 441 /*
 442  * Initialize xcb and use the specified fontname for text-rendering
 443  *
 444  */
 445 void init_xcb(char *fontname) {
 446     /* FIXME: xcb_connect leaks Memory */
 447     xcb_connection = xcb_connect(NULL, NULL);
 448     if (xcb_connection_has_error(xcb_connection)) {
 449         ELOG("Cannot open display\n");
 450         exit(EXIT_FAILURE);
 451     }
 452     DLOG("Connected to xcb\n");
 453
 454     /* We have to request the atoms we need */
 455     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 456     #include "xcb_atoms.def"
 457
 458     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 459     xcb_root = xcb_screen->root;
 460
 461     /* We load and allocate the font */
 462     xcb_font = xcb_generate_id(xcb_connection);
 463     xcb_void_cookie_t open_font_cookie;
 464     open_font_cookie = xcb_open_font_checked(xcb_connection,
 465                                              xcb_font,
 466                                              strlen(fontname),
 467                                              fontname);
 468
 469     /* We need to save info about the font, because we need the fonts height and
 470      * information about the width of characters */
 471     xcb_query_font_cookie_t query_font_cookie;
 472     query_font_cookie = xcb_query_font(xcb_connection,
 473                                        xcb_font);
 474
 475     /* To grab modifiers without blocking other applications from receiving key-events
 476      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 477      * in xcb */
 478     if (config.hide_on_modifier) {
 479         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 480         xkb_major = XkbMajorVersion;
 481         xkb_minor = XkbMinorVersion;
 482
 483         xkb_dpy = XkbOpenDisplay(":0",
 484                                  &xkb_event_base,
 485                                  &xkb_errbase,
 486                                  &xkb_major,
 487                                  &xkb_minor,
 488                                  &xkb_err);
 489
 490         if (xkb_dpy == NULL) {
 491             ELOG("No XKB!\n");
 492             exit(EXIT_FAILURE);
 493         }
 494
 495         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 496             ELOG("Could not set FD_CLOEXEC on xkbdpy\n");
 497             exit(EXIT_FAILURE);
 498         }
 499
 500         int i1;
 501         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 502             ELOG("XKB not supported by X-server!\n");
 503             exit(EXIT_FAILURE);
 504         }
 505
 506         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 507             ELOG("Could not grab Key!\n");
 508             exit(EXIT_FAILURE);
 509         }
 510
 511         xkb_io = malloc(sizeof(ev_io));
 512         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 513         ev_io_start(main_loop, xkb_io);
 514         XFlush(xkb_dpy);
 515     }
 516
 517     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 518      * this way, we can choose to crop it */
 519     statusline_ctx = xcb_generate_id(xcb_connection);
 520     uint32_t mask = XCB_GC_FOREGROUND |
 521                     XCB_GC_BACKGROUND |
 522                     XCB_GC_FONT;
 523     uint32_t vals[3] = { colors.bar_fg, colors.bar_bg, xcb_font };
 524
 525     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 526                                                             statusline_ctx,
 527                                                             xcb_root,
 528                                                             mask,
 529                                                             vals);
 530
 531     /* We only generate an id for the pixmap, because the width of it is dependent on the
 532      * input we get */
 533     statusline_pm = xcb_generate_id(xcb_connection);
 534
 535     /* The varios Watchers to communicate with xcb */
 536     xcb_io = malloc(sizeof(ev_io));
 537     xcb_prep = malloc(sizeof(ev_prepare));
 538     xcb_chk = malloc(sizeof(ev_check));
 539
 540     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 541     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 542     ev_check_init(xcb_chk, &xcb_chk_cb);
 543
 544     ev_io_start(main_loop, xcb_io);
 545     ev_prepare_start(main_loop, xcb_prep);
 546     ev_check_start(main_loop, xcb_chk);
 547
 548     /* Now we get the atoms and save them in a nice data-structure */
 549     get_atoms();
 550
 551     /* Now we save the font-infos */
 552     font_info = xcb_query_font_reply(xcb_connection,
 553                                      query_font_cookie,
 554                                      NULL);
 555     font_height = font_info->font_ascent + font_info->font_descent;
 556
 557     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 558         exit(EXIT_FAILURE);
 559     }
 560
 561     if (xcb_query_font_char_infos_length(font_info) == 0) {
 562         font_table = NULL;
 563     } else {
 564         font_table = xcb_query_font_char_infos(font_info);
 565     }
 566
 567     DLOG("Calculated Font-height: %d\n", font_height);
 568
 569     if (xcb_request_failed(sl_ctx_cookie, "Could not create context for statusline")) {
 570         exit(EXIT_FAILURE);
 571     }
 572 }
 573
 574 /*
 575  * Cleanup the xcb-stuff.
 576  * Called once, before the program terminates.
 577  *
 578  */
 579 void clean_xcb() {
 580     i3_output *walk;
 581     SLIST_FOREACH(walk, outputs, slist) {
 582         destroy_window(walk);
 583     }
 584     FREE_SLIST(outputs, i3_output);
 585
 586     xcb_disconnect(xcb_connection);
 587
 588     ev_check_stop(main_loop, xcb_chk);
 589     ev_prepare_stop(main_loop, xcb_prep);
 590     ev_io_stop(main_loop, xcb_io);
 591
 592     FREE(xcb_chk);
 593     FREE(xcb_prep);
 594     FREE(xcb_io);
 595     FREE(font_info);
 596 }
 597
 598 /*
 599  * Get the earlier requested atoms and save them in the prepared data-structure
 600  *
 601  */
 602 void get_atoms() {
 603     xcb_intern_atom_reply_t *reply;
 604     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
 605         if (reply == NULL) { \
 606             ELOG("Could not get atom %s\n", #name); \
 607             exit(EXIT_FAILURE); \
 608         } \
 609         atoms[name] = reply->atom; \
 610         free(reply);
 611
 612     #include "xcb_atoms.def"
 613     DLOG("Got Atoms\n");
 614 }
 615
 616 /*
 617  * Destroy the bar of the specified output
 618  *
 619  */
 620 void destroy_window(i3_output *output) {
 621     if (output == NULL) {
 622         return;
 623     }
 624     if (output->bar == XCB_NONE) {
 625         return;
 626     }
 627     xcb_destroy_window(xcb_connection, output->bar);
 628     output->bar = XCB_NONE;
 629 }
 630
 631 /*
 632  * Reconfigure all bars and create new for newly activated outputs
 633  *
 634  */
 635 void reconfig_windows() {
 636     uint32_t mask;
 637     uint32_t values[5];
 638
 639     xcb_generic_error_t *err;
 640
 641     i3_output *walk;
 642     SLIST_FOREACH(walk, outputs, slist) {
 643         if (!walk->active) {
 644             /* If an output is not active, we destroy it's bar */
 645             /* FIXME: Maybe we rather want to unmap? */
 646             DLOG("Destroying window for output %s\n", walk->name);
 647             destroy_window(walk);
 648             continue;
 649         }
 650         if (walk->bar == XCB_NONE) {
 651             DLOG("Creating Window for output %s\n", walk->name);
 652
 653             walk->bar = xcb_generate_id(xcb_connection);
 654             walk->buffer = xcb_generate_id(xcb_connection);
 655             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 656             /* Black background */
 657             values[0] = colors.bar_bg;
 658             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
 659             values[1] = config.hide_on_modifier;
 660             /* The events we want to receive */
 661             values[2] = XCB_EVENT_MASK_EXPOSURE |
 662                         XCB_EVENT_MASK_BUTTON_PRESS;
 663             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
 664                                                                      xcb_screen->root_depth,
 665                                                                      walk->bar,
 666                                                                      xcb_root,
 667                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
 668                                                                      walk->rect.w, font_height + 6,
 669                                                                      1,
 670                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
 671                                                                      xcb_screen->root_visual,
 672                                                                      mask,
 673                                                                      values);
 674
 675             /* The double-buffer we use to render stuff off-screen */
 676             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 677                                                                     xcb_screen->root_depth,
 678                                                                     walk->buffer,
 679                                                                     walk->bar,
 680                                                                     walk->rect.w,
 681                                                                     walk->rect.h);
 682
 683             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
 684              * this one */
 685             xcb_void_cookie_t prop_cookie = xcb_change_property(xcb_connection,
 686                                                                 XCB_PROP_MODE_REPLACE,
 687                                                                 walk->bar,
 688                                                                 atoms[_NET_WM_WINDOW_TYPE],
 689                                                                 atoms[ATOM],
 690                                                                 32,
 691                                                                 1,
 692                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
 693
 694             /* We also want a graphics-context for the bars (it defines the properties
 695              * with which we draw to them) */
 696             walk->bargc = xcb_generate_id(xcb_connection);
 697             mask = XCB_GC_FONT;
 698             values[0] = xcb_font;
 699             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
 700                                                                 walk->bargc,
 701                                                                 walk->bar,
 702                                                                 mask,
 703                                                                 values);
 704
 705             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
 706             xcb_void_cookie_t map_cookie;
 707             if (!config.hide_on_modifier) {
 708                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
 709             }
 710
 711             if (xcb_request_failed(win_cookie,  "Could not create window") ||
 712                 xcb_request_failed(pm_cookie,   "Could not create pixmap") ||
 713                 xcb_request_failed(prop_cookie, "Could not set dock mode") ||
 714                 xcb_request_failed(gc_cookie,   "Could not create graphical context") ||
 715                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
 716                 exit(EXIT_FAILURE);
 717             }
 718         } else {
 719             /* We already have a bar, so we just reconfigure it */
 720             mask = XCB_CONFIG_WINDOW_X |
 721                    XCB_CONFIG_WINDOW_Y |
 722                    XCB_CONFIG_WINDOW_WIDTH |
 723                    XCB_CONFIG_WINDOW_HEIGHT |
 724                    XCB_CONFIG_WINDOW_STACK_MODE;
 725             values[0] = walk->rect.x;
 726             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 727             values[2] = walk->rect.w;
 728             values[3] = font_height + 6;
 729             values[4] = XCB_STACK_MODE_ABOVE;
 730             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 731             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
 732                                                                         walk->bar,
 733                                                                         mask,
 734                                                                         values);
 735             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
 736                 exit(EXIT_FAILURE);
 737             }
 738         }
 739     }
 740 }
 741
 742 /*
 743  * Render the bars, with buttons and statusline
 744  *
 745  */
 746 void draw_bars() {
 747     DLOG("Drawing Bars...\n");
 748     int i = 0;
 749
 750     refresh_statusline();
 751
 752     i3_output *outputs_walk;
 753     SLIST_FOREACH(outputs_walk, outputs, slist) {
 754         if (!outputs_walk->active) {
 755             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
 756             continue;
 757         }
 758         if (outputs_walk->bar == XCB_NONE) {
 759             /* Oh shit, an active output without an own bar. Create it now! */
 760             reconfig_windows();
 761         }
 762         /* First things first: clear the backbuffer */
 763         uint32_t color = colors.bar_bg;
 764         xcb_change_gc(xcb_connection,
 765                       outputs_walk->bargc,
 766                       XCB_GC_FOREGROUND,
 767                       &color);
 768         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
 769         xcb_poly_fill_rectangle(xcb_connection,
 770                                 outputs_walk->buffer,
 771                                 outputs_walk->bargc,
 772                                 1,
 773                                 &rect);
 774
 775         if (statusline != NULL) {
 776             DLOG("Printing statusline!\n");
 777
 778             /* Luckily we already prepared a seperate pixmap containing the rendered
 779              * statusline, we just have to copy the relevant parts to the relevant
 780              * position */
 781             xcb_copy_area(xcb_connection,
 782                           statusline_pm,
 783                           outputs_walk->buffer,
 784                           outputs_walk->bargc,
 785                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
 786                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - 4)), 3,
 787                           MIN(outputs_walk->rect.w - 4, statusline_width), font_height);
 788         }
 789
 790         i3_ws *ws_walk;
 791         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
 792             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
 793             uint32_t fg_color = colors.inactive_ws_fg;
 794             uint32_t bg_color = colors.inactive_ws_bg;
 795             if (ws_walk->visible) {
 796                 fg_color = colors.active_ws_fg;
 797                 bg_color = colors.active_ws_bg;
 798             }
 799             if (ws_walk->urgent) {
 800                 DLOG("WS %s is urgent!\n", ws_walk->name);
 801                 fg_color = colors.urgent_ws_fg;
 802                 bg_color = colors.urgent_ws_bg;
 803                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
 804                 unhide_bars();
 805             }
 806             xcb_change_gc(xcb_connection,
 807                           outputs_walk->bargc,
 808                           XCB_GC_FOREGROUND,
 809                           &bg_color);
 810             xcb_change_gc(xcb_connection,
 811                           outputs_walk->bargc,
 812                           XCB_GC_BACKGROUND,
 813                           &bg_color);
 814             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
 815             xcb_poly_fill_rectangle(xcb_connection,
 816                                     outputs_walk->buffer,
 817                                     outputs_walk->bargc,
 818                                     1,
 819                                     &rect);
 820             xcb_change_gc(xcb_connection,
 821                           outputs_walk->bargc,
 822                           XCB_GC_FOREGROUND,
 823                           &fg_color);
 824             xcb_image_text_16(xcb_connection,
 825                               ws_walk->name_glyphs,
 826                               outputs_walk->buffer,
 827                               outputs_walk->bargc,
 828                               i + 5, font_info->font_ascent + 2,
 829                               ws_walk->ucs2_name);
 830             i += 10 + ws_walk->name_width;
 831         }
 832
 833         redraw_bars();
 834
 835         i = 0;
 836     }
 837 }
 838
 839 /*
 840  * Redraw the bars, i.e. simply copy the buffer to the barwindow
 841  *
 842  */
 843 void redraw_bars() {
 844     i3_output *outputs_walk;
 845     SLIST_FOREACH(outputs_walk, outputs, slist) {
 846         xcb_copy_area(xcb_connection,
 847                       outputs_walk->buffer,
 848                       outputs_walk->bar,
 849                       outputs_walk->bargc,
 850                       0, 0,
 851                       0, 0,
 852                       outputs_walk->rect.w,
 853                       outputs_walk->rect.h);
 854         xcb_flush(xcb_connection);
 855     }
 856 }