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