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   1 /*
   2  * i3bar - an xcb-based status- and ws-bar for i3
   3  *
   4  * © 2010-2011 Axel Wagner and contributors
   5  *
   6  * See file LICNSE for license information
   7  *
   8  * src/xcb.c: Communicating with X
   9  *
  10  */
  11 #include <xcb/xcb.h>
  12 #include <xcb/xproto.h>
  13 #include <xcb/xcb_atom.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include <fcntl.h>
  18 #include <string.h>
  19 #include <i3/ipc.h>
  20 #include <ev.h>
  21 #include <errno.h>
  22 #include <limits.h>
  23
  24 #include <X11/Xlib.h>
  25 #include <X11/XKBlib.h>
  26 #include <X11/extensions/XKB.h>
  27
  28 #include "common.h"
  29
  30 #if defined(__APPLE__)
  31
  32 /*
  33  * Taken from FreeBSD
  34  * Returns a pointer to a new string which is a duplicate of the
  35  * string, but only copies at most n characters.
  36  *
  37  */
  38 char *strndup(const char *str, size_t n) {
  39     size_t len;
  40     char *copy;
  41
  42     for (len = 0; len < n && str[len]; len++)
  43         continue;
  44
  45     if ((copy = malloc(len + 1)) == NULL)
  46         return (NULL);
  47     memcpy(copy, str, len);
  48     copy[len] = '\0';
  49     return (copy);
  50 }
  51
  52 #endif
  53
  54 /* We save the Atoms in an easy to access array, indexed by an enum */
  55 enum {
  56     #define ATOM_DO(name) name,
  57     #include "xcb_atoms.def"
  58     NUM_ATOMS
  59 };
  60
  61 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  62 xcb_atom_t               atoms[NUM_ATOMS];
  63
  64 /* Variables, that are the same for all functions at all times */
  65 xcb_connection_t *xcb_connection;
  66 xcb_screen_t     *xcb_screen;
  67 xcb_window_t     xcb_root;
  68 xcb_font_t       xcb_font;
  69
  70 /* We need to cache some data to speed up text-width-prediction */
  71 xcb_query_font_reply_t *font_info;
  72 int                    font_height;
  73 xcb_charinfo_t         *font_table;
  74
  75 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  76 Display          *xkb_dpy;
  77 int              xkb_event_base;
  78 int              mod_pressed = 0;
  79
  80 /* Because the statusline is the same on all outputs, we have
  81  * global buffer to render it on */
  82 xcb_gcontext_t   statusline_ctx;
  83 xcb_gcontext_t   statusline_clear;
  84 xcb_pixmap_t     statusline_pm;
  85 uint32_t         statusline_width;
  86
  87 /* Event-Watchers, to interact with the user */
  88 ev_prepare *xcb_prep;
  89 ev_check   *xcb_chk;
  90 ev_io      *xcb_io;
  91 ev_io      *xkb_io;
  92
  93 /* The parsed colors */
  94 struct xcb_colors_t {
  95     uint32_t bar_fg;
  96     uint32_t bar_bg;
  97     uint32_t active_ws_fg;
  98     uint32_t active_ws_bg;
  99     uint32_t inactive_ws_fg;
 100     uint32_t inactive_ws_bg;
 101     uint32_t urgent_ws_bg;
 102     uint32_t urgent_ws_fg;
 103     uint32_t focus_ws_bg;
 104     uint32_t focus_ws_fg;
 105 };
 106 struct xcb_colors_t colors;
 107
 108 /* We define xcb_request_failed as a macro to include the relevant line-number */
 109 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
 110 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
 111     xcb_generic_error_t *err;
 112     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
 113         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
 114         return err->error_code;
 115     }
 116     return 0;
 117 }
 118
 119 /*
 120  * Predicts the length of text based on cached data.
 121  * The string has to be encoded in ucs2 and glyph_len has to be the length
 122  * of the string (in glyphs).
 123  *
 124  */
 125 uint32_t predict_text_extents(xcb_char2b_t *text, uint32_t length) {
 126     /* If we don't have per-character data, return the maximum width */
 127     if (font_table == NULL) {
 128         return (font_info->max_bounds.character_width * length);
 129     }
 130
 131     uint32_t width = 0;
 132     uint32_t i;
 133
 134     for (i = 0; i < length; i++) {
 135         xcb_charinfo_t *info;
 136         int row = text[i].byte1;
 137         int col = text[i].byte2;
 138
 139         if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
 140             col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) {
 141             continue;
 142         }
 143
 144         /* Don't you ask me, how this one works… */
 145         info = &font_table[((row - font_info->min_byte1) *
 146                             (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
 147                            (col - font_info->min_char_or_byte2)];
 148
 149         if (info->character_width != 0 ||
 150             (info->right_side_bearing |
 151              info->left_side_bearing |
 152              info->ascent |
 153              info->descent) != 0) {
 154             width += info->character_width;
 155         }
 156     }
 157
 158     return width;
 159 }
 160
 161 /*
 162  * Draws text given in UCS-2-encoding to a given drawable and position
 163  *
 164  */
 165 void draw_text(xcb_drawable_t drawable, xcb_gcontext_t ctx, int16_t x, int16_t y,
 166                xcb_char2b_t *text, uint32_t glyph_count) {
 167     int offset = 0;
 168     int16_t pos_x = x;
 169     int16_t font_ascent = font_info->font_ascent;
 170
 171     while (glyph_count > 0) {
 172         uint8_t chunk_size = MIN(255, glyph_count);
 173         uint32_t chunk_width = predict_text_extents(text + offset, chunk_size);
 174
 175         xcb_image_text_16(xcb_connection,
 176                           chunk_size,
 177                           drawable,
 178                           ctx,
 179                           pos_x, y + font_ascent,
 180                           text + offset);
 181
 182         offset += chunk_size;
 183         pos_x += chunk_width;
 184         glyph_count -= chunk_size;
 185     }
 186 }
 187
 188 /*
 189  * Converts a colorstring to a colorpixel as expected from xcb_change_gc.
 190  * s is assumed to be in the format "rrggbb"
 191  *
 192  */
 193 uint32_t get_colorpixel(const char *s) {
 194     char strings[3][3] = { { s[0], s[1], '\0'} ,
 195                            { s[2], s[3], '\0'} ,
 196                            { s[4], s[5], '\0'} };
 197     uint8_t r = strtol(strings[0], NULL, 16);
 198     uint8_t g = strtol(strings[1], NULL, 16);
 199     uint8_t b = strtol(strings[2], NULL, 16);
 200     return (r << 16 | g << 8 | b);
 201 }
 202
 203 /*
 204  * Redraws the statusline to the buffer
 205  *
 206  */
 207 void refresh_statusline() {
 208     int glyph_count;
 209
 210     if (statusline == NULL) {
 211         return;
 212     }
 213
 214     xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
 215     statusline_width = predict_text_extents(text, glyph_count);
 216
 217     xcb_rectangle_t rect = { 0, 0, xcb_screen->width_in_pixels, font_height };
 218     xcb_poly_fill_rectangle(xcb_connection, statusline_pm, statusline_clear, 1, &rect);
 219     draw_text(statusline_pm, statusline_ctx, 0, 0, text, glyph_count);
 220
 221     FREE(text);
 222 }
 223
 224 /*
 225  * Hides all bars (unmaps them)
 226  *
 227  */
 228 void hide_bars() {
 229     if (!config.hide_on_modifier) {
 230         return;
 231     }
 232
 233     i3_output *walk;
 234     SLIST_FOREACH(walk, outputs, slist) {
 235         if (!walk->active) {
 236             continue;
 237         }
 238         xcb_unmap_window(xcb_connection, walk->bar);
 239     }
 240     stop_child();
 241 }
 242
 243 /*
 244  * Unhides all bars (maps them)
 245  *
 246  */
 247 void unhide_bars() {
 248     if (!config.hide_on_modifier) {
 249         return;
 250     }
 251
 252     i3_output           *walk;
 253     xcb_void_cookie_t   cookie;
 254     uint32_t            mask;
 255     uint32_t            values[5];
 256
 257     cont_child();
 258
 259     SLIST_FOREACH(walk, outputs, slist) {
 260         if (walk->bar == XCB_NONE) {
 261             continue;
 262         }
 263         mask = XCB_CONFIG_WINDOW_X |
 264                XCB_CONFIG_WINDOW_Y |
 265                XCB_CONFIG_WINDOW_WIDTH |
 266                XCB_CONFIG_WINDOW_HEIGHT |
 267                XCB_CONFIG_WINDOW_STACK_MODE;
 268         values[0] = walk->rect.x;
 269         values[1] = walk->rect.y + walk->rect.h - font_height - 6;
 270         values[2] = walk->rect.w;
 271         values[3] = font_height + 6;
 272         values[4] = XCB_STACK_MODE_ABOVE;
 273         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 274         cookie = xcb_configure_window_checked(xcb_connection,
 275                                               walk->bar,
 276                                               mask,
 277                                               values);
 278
 279         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 280             exit(EXIT_FAILURE);
 281         }
 282         xcb_map_window(xcb_connection, walk->bar);
 283     }
 284 }
 285
 286 /*
 287  * Parse the colors into a format that we can use
 288  *
 289  */
 290 void init_colors(const struct xcb_color_strings_t *new_colors) {
 291 #define PARSE_COLOR(name, def) \
 292     do { \
 293         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 294     } while  (0)
 295     PARSE_COLOR(bar_fg, "FFFFFF");
 296     PARSE_COLOR(bar_bg, "000000");
 297     PARSE_COLOR(active_ws_fg, "FFFFFF");
 298     PARSE_COLOR(active_ws_bg, "480000");
 299     PARSE_COLOR(inactive_ws_fg, "FFFFFF");
 300     PARSE_COLOR(inactive_ws_bg, "240000");
 301     PARSE_COLOR(urgent_ws_fg, "FFFFFF");
 302     PARSE_COLOR(urgent_ws_bg, "002400");
 303     PARSE_COLOR(focus_ws_fg, "FFFFFF");
 304     PARSE_COLOR(focus_ws_bg, "480000");
 305 #undef PARSE_COLOR
 306 }
 307
 308 /*
 309  * Handle a button-press-event (i.e. a mouse click on one of our bars).
 310  * We determine, whether the click occured on a ws-button or if the scroll-
 311  * wheel was used and change the workspace appropriately
 312  *
 313  */
 314 void handle_button(xcb_button_press_event_t *event) {
 315     i3_ws *cur_ws;
 316
 317     /* Determine, which bar was clicked */
 318     i3_output *walk;
 319     xcb_window_t bar = event->event;
 320     SLIST_FOREACH(walk, outputs, slist) {
 321         if (walk->bar == bar) {
 322             break;
 323         }
 324     }
 325
 326     if (walk == NULL) {
 327         DLOG("Unknown Bar klicked!\n");
 328         return;
 329     }
 330
 331     /* TODO: Move this to extern get_ws_for_output() */
 332     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 333         if (cur_ws->visible) {
 334             break;
 335         }
 336     }
 337
 338     if (cur_ws == NULL) {
 339         DLOG("No Workspace active?\n");
 340         return;
 341     }
 342
 343     int32_t x = event->event_x;
 344
 345     DLOG("Got Button %d\n", event->detail);
 346
 347     switch (event->detail) {
 348         case 1:
 349             /* Left Mousbutton. We determine, which button was clicked
 350              * and set cur_ws accordingly */
 351             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 352                 DLOG("x = %d\n", x);
 353                 if (x < cur_ws->name_width + 10) {
 354                     break;
 355                 }
 356                 x -= cur_ws->name_width + 10;
 357             }
 358             if (cur_ws == NULL) {
 359                 return;
 360             }
 361             break;
 362         case 4:
 363             /* Mouse wheel down. We select the next ws */
 364             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 365                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 366             } else {
 367                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 368             }
 369             break;
 370         case 5:
 371             /* Mouse wheel up. We select the previos ws */
 372             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 373                 cur_ws = TAILQ_FIRST(walk->workspaces);
 374             } else {
 375                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 376             }
 377             break;
 378     }
 379
 380     const size_t len = strlen(cur_ws->name) + strlen("workspace \"\"") + 1;
 381     char buffer[len];
 382     snprintf(buffer, len, "workspace \"%s\"", cur_ws->name);
 383     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 384 }
 385
 386 void handle_client_message(xcb_client_message_event_t* event) {
 387     printf("got a client message, yay\n");
 388     if (event->type == atoms[_NET_SYSTEM_TRAY_OPCODE] &&
 389         event->format == 32) {
 390         printf("system tray message\n");
 391         /* event->data.data32[0] is the timestamp */
 392         uint32_t op = event->data.data32[1];
 393 #define SYSTEM_TRAY_REQUEST_DOCK    0
 394 #define SYSTEM_TRAY_BEGIN_MESSAGE   1
 395 #define SYSTEM_TRAY_CANCEL_MESSAGE  2
 396         if (op == SYSTEM_TRAY_REQUEST_DOCK) {
 397             printf("docking requested of x window id %d\n", event->data.data32[2]);
 398             /* TODO: correctly handle multiple dock clients */
 399             xcb_window_t client = event->data.data32[2];
 400             i3_output *walk, *output;
 401             SLIST_FOREACH(walk, outputs, slist) {
 402                 if (!walk->active)
 403                     continue;
 404                 printf("using output %s\n", walk->name);
 405                 output = walk;
 406             }
 407             xcb_reparent_window(xcb_connection,
 408                                 client,
 409                                 output->bar,
 410                                 output->rect.w - font_height - 2, /* TODO: why -2? */
 411                                 2);
 412             /* We reconfigure the window to use a reasonable size. The systray
 413              * specification explicitly says:
 414              *   Tray icons may be assigned any size by the system tray, and
 415              *   should do their best to cope with any size effectively
 416              */
 417             uint32_t mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
 418             uint32_t values[] = { font_height, font_height };
 419             xcb_configure_window(xcb_connection,
 420                                  client,
 421                                  mask,
 422                                  values);
 423
 424             /* Listen for PropertyNotify events to get the most recent value of
 425              * the XEMBED_MAPPED atom, also listen for UnmapNotify events */
 426             mask = XCB_CW_EVENT_MASK;
 427             values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
 428                     XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 429             xcb_change_window_attributes(xcb_connection,
 430                                          client,
 431                                          mask,
 432                                          values);
 433             xcb_map_window(xcb_connection, client);
 434             trayclient *tc = malloc(sizeof(trayclient));
 435             tc->win = client;
 436             TAILQ_INSERT_TAIL(output->trayclients, tc, tailq);
 437
 438             /* Trigger an update to copy the statusline text to the appropriate
 439              * position */
 440             draw_bars();
 441         }
 442     }
 443 }
 444
 445 void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
 446     DLOG("UnmapNotify for window = %08x, event = %08x\n", event->window, event->event);
 447
 448     i3_output *walk;
 449     SLIST_FOREACH(walk, outputs, slist) {
 450         if (!walk->active)
 451             continue;
 452         DLOG("checking output %s\n", walk->name);
 453         trayclient *trayclient;
 454         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 455             if (trayclient->win != event->window)
 456                 continue;
 457
 458             DLOG("Removing tray client with window ID %08x\n", event->window);
 459             TAILQ_REMOVE(walk->trayclients, trayclient, tailq);
 460
 461             /* Trigger an update, we now have more space for the statusline */
 462             draw_bars();
 463             return;
 464         }
 465     }
 466 }
 467
 468 /*
 469  * This function is called immediately before the main loop locks. We flush xcb
 470  * then (and only then)
 471  *
 472  */
 473 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 474     xcb_flush(xcb_connection);
 475 }
 476
 477 /*
 478  * This function is called immediately after the main loop locks, so when one
 479  * of the watchers registered an event.
 480  * We check whether an X-Event arrived and handle it.
 481  *
 482  */
 483 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 484     xcb_generic_event_t *event;
 485     while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
 486         return;
 487     }
 488
 489     switch (event->response_type & ~0x80) {
 490         case XCB_EXPOSE:
 491             /* Expose-events happen, when the window needs to be redrawn */
 492             redraw_bars();
 493             break;
 494         case XCB_BUTTON_PRESS:
 495             /* Button-press-events are mouse-buttons clicked on one of our bars */
 496             handle_button((xcb_button_press_event_t*) event);
 497             break;
 498         case XCB_CLIENT_MESSAGE:
 499             /* Client messages are used for client-to-client communication, for
 500              * example system tray widgets talk to us directly via client messages. */
 501             handle_client_message((xcb_client_message_event_t*) event);
 502             break;
 503         case XCB_UNMAP_NOTIFY:
 504             /* UnmapNotifies are received when a tray window unmaps itself */
 505             handle_unmap_notify((xcb_unmap_notify_event_t*) event);
 506             break;
 507     }
 508     FREE(event);
 509 }
 510
 511 /*
 512  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 513  * are triggered
 514  *
 515  */
 516 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 517 }
 518
 519 /*
 520  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 521  *
 522  */
 523 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 524     XkbEvent ev;
 525     int modstate = 0;
 526
 527     DLOG("Got XKB-Event!\n");
 528
 529     while (XPending(xkb_dpy)) {
 530         XNextEvent(xkb_dpy, (XEvent*)&ev);
 531
 532         if (ev.type != xkb_event_base) {
 533             ELOG("No Xkb-Event!\n");
 534             continue;
 535         }
 536
 537         if (ev.any.xkb_type != XkbStateNotify) {
 538             ELOG("No State Notify!\n");
 539             continue;
 540         }
 541
 542         unsigned int mods = ev.state.mods;
 543         modstate = mods & Mod4Mask;
 544     }
 545
 546     if (modstate != mod_pressed) {
 547         if (modstate == 0) {
 548             DLOG("Mod4 got released!\n");
 549             hide_bars();
 550         } else {
 551             DLOG("Mod4 got pressed!\n");
 552             unhide_bars();
 553         }
 554         mod_pressed = modstate;
 555     }
 556 }
 557
 558 /*
 559  * Initialize xcb and use the specified fontname for text-rendering
 560  *
 561  */
 562 char *init_xcb(char *fontname) {
 563     /* FIXME: xcb_connect leaks Memory */
 564     xcb_connection = xcb_connect(NULL, NULL);
 565     if (xcb_connection_has_error(xcb_connection)) {
 566         ELOG("Cannot open display\n");
 567         exit(EXIT_FAILURE);
 568     }
 569     DLOG("Connected to xcb\n");
 570
 571     /* We have to request the atoms we need */
 572     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 573     #include "xcb_atoms.def"
 574
 575     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 576     xcb_root = xcb_screen->root;
 577
 578     /* We load and allocate the font */
 579     xcb_font = xcb_generate_id(xcb_connection);
 580     xcb_void_cookie_t open_font_cookie;
 581     open_font_cookie = xcb_open_font_checked(xcb_connection,
 582                                              xcb_font,
 583                                              strlen(fontname),
 584                                              fontname);
 585
 586     /* We need to save info about the font, because we need the font's height and
 587      * information about the width of characters */
 588     xcb_query_font_cookie_t query_font_cookie;
 589     query_font_cookie = xcb_query_font(xcb_connection,
 590                                        xcb_font);
 591
 592     /* To grab modifiers without blocking other applications from receiving key-events
 593      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 594      * in xcb */
 595     if (config.hide_on_modifier) {
 596         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 597         xkb_major = XkbMajorVersion;
 598         xkb_minor = XkbMinorVersion;
 599
 600         xkb_dpy = XkbOpenDisplay(NULL,
 601                                  &xkb_event_base,
 602                                  &xkb_errbase,
 603                                  &xkb_major,
 604                                  &xkb_minor,
 605                                  &xkb_err);
 606
 607         if (xkb_dpy == NULL) {
 608             ELOG("No XKB!\n");
 609             exit(EXIT_FAILURE);
 610         }
 611
 612         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 613             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 614             exit(EXIT_FAILURE);
 615         }
 616
 617         int i1;
 618         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 619             ELOG("XKB not supported by X-server!\n");
 620             exit(EXIT_FAILURE);
 621         }
 622
 623         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 624             ELOG("Could not grab Key!\n");
 625             exit(EXIT_FAILURE);
 626         }
 627
 628         xkb_io = malloc(sizeof(ev_io));
 629         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 630         ev_io_start(main_loop, xkb_io);
 631         XFlush(xkb_dpy);
 632     }
 633
 634     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 635      * this way, we can choose to crop it */
 636     uint32_t mask = XCB_GC_FOREGROUND;
 637     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 638
 639     statusline_clear = xcb_generate_id(xcb_connection);
 640     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 641                                                                statusline_clear,
 642                                                                xcb_root,
 643                                                                mask,
 644                                                                vals);
 645
 646     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 647     vals[0] = colors.bar_fg;
 648     statusline_ctx = xcb_generate_id(xcb_connection);
 649     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 650                                                             statusline_ctx,
 651                                                             xcb_root,
 652                                                             mask,
 653                                                             vals);
 654
 655     statusline_pm = xcb_generate_id(xcb_connection);
 656     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 657                                                                xcb_screen->root_depth,
 658                                                                statusline_pm,
 659                                                                xcb_root,
 660                                                                xcb_screen->width_in_pixels,
 661                                                                xcb_screen->height_in_pixels);
 662
 663
 664     /* The various Watchers to communicate with xcb */
 665     xcb_io = malloc(sizeof(ev_io));
 666     xcb_prep = malloc(sizeof(ev_prepare));
 667     xcb_chk = malloc(sizeof(ev_check));
 668
 669     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 670     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 671     ev_check_init(xcb_chk, &xcb_chk_cb);
 672
 673     ev_io_start(main_loop, xcb_io);
 674     ev_prepare_start(main_loop, xcb_prep);
 675     ev_check_start(main_loop, xcb_chk);
 676
 677     /* Now we get the atoms and save them in a nice data structure */
 678     get_atoms();
 679
 680     xcb_get_property_cookie_t path_cookie;
 681     path_cookie = xcb_get_property_unchecked(xcb_connection,
 682                                    0,
 683                                    xcb_root,
 684                                    atoms[I3_SOCKET_PATH],
 685                                    XCB_GET_PROPERTY_TYPE_ANY,
 686                                    0, PATH_MAX);
 687
 688     /* We check, if i3 set its socket-path */
 689     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 690                                                                   path_cookie,
 691                                                                   NULL);
 692     char *path = NULL;
 693     if (path_reply) {
 694         int len = xcb_get_property_value_length(path_reply);
 695         if (len != 0) {
 696             path = strndup(xcb_get_property_value(path_reply), len);
 697         }
 698     }
 699
 700     /* Now we save the font-infos */
 701     font_info = xcb_query_font_reply(xcb_connection,
 702                                      query_font_cookie,
 703                                      NULL);
 704
 705     if (xcb_request_failed(open_font_cookie, "Could not open font")) {
 706         exit(EXIT_FAILURE);
 707     }
 708
 709     font_height = font_info->font_ascent + font_info->font_descent;
 710
 711     if (xcb_query_font_char_infos_length(font_info) == 0) {
 712         font_table = NULL;
 713     } else {
 714         font_table = xcb_query_font_char_infos(font_info);
 715     }
 716
 717     DLOG("Calculated Font-height: %d\n", font_height);
 718
 719     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 720         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 721         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 722         exit(EXIT_FAILURE);
 723     }
 724
 725     return path;
 726 }
 727
 728 void init_tray() {
 729 /* tray support: we need a window to own the selection */
 730     xcb_void_cookie_t selwin_cookie;
 731     xcb_window_t selwin = xcb_generate_id(xcb_connection);
 732     uint32_t selmask = XCB_CW_OVERRIDE_REDIRECT;
 733     uint32_t selval[] = { 1 };
 734     selwin_cookie = xcb_create_window_checked(xcb_connection,
 735                                               xcb_screen->root_depth,
 736                                               selwin,
 737                                               xcb_root,
 738                                               -1, -1,
 739                                               1, 1,
 740                                               1,
 741                                               XCB_WINDOW_CLASS_INPUT_OUTPUT,
 742                                               xcb_screen->root_visual,
 743                                               selmask,
 744                                               selval);
 745
 746 #define _NET_SYSTEM_TRAY_ORIENTATION_HORZ 0
 747 #define _NET_SYSTEM_TRAY_ORIENTATION_VERT 1
 748     uint32_t orientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
 749     /* set the atoms */
 750     xcb_change_property(xcb_connection,
 751                         XCB_PROP_MODE_REPLACE,
 752                         selwin,
 753                         atoms[_NET_SYSTEM_TRAY_ORIENTATION],
 754                         atoms[CARDINAL],
 755                         32,
 756                         1,
 757                         &orientation);
 758
 759
 760     xcb_set_selection_owner(xcb_connection,
 761                             selwin,
 762                             /* TODO: request this atom separately */
 763                             atoms[_NET_SYSTEM_TRAY_S0],
 764                             XCB_CURRENT_TIME);
 765     /* FIXME: don't use XCB_CURRENT_TIME */
 766
 767     /* TODO: check if we got the selection */
 768     void *event = calloc(32, 1);
 769     xcb_client_message_event_t *ev = event;
 770     ev->response_type = XCB_CLIENT_MESSAGE;
 771     ev->window = xcb_root;
 772     ev->type = atoms[MANAGER];
 773     ev->format = 32;
 774     ev->data.data32[0] = XCB_CURRENT_TIME;
 775     ev->data.data32[1] = atoms[_NET_SYSTEM_TRAY_S0];
 776     ev->data.data32[2] = selwin;
 777     xcb_send_event(xcb_connection,
 778                    0,
 779                    xcb_root,
 780                    XCB_EVENT_MASK_STRUCTURE_NOTIFY,
 781                    (char*)ev);
 782 }
 783
 784 /*
 785  * Cleanup the xcb-stuff.
 786  * Called once, before the program terminates.
 787  *
 788  */
 789 void clean_xcb() {
 790     i3_output *o_walk;
 791     free_workspaces();
 792     SLIST_FOREACH(o_walk, outputs, slist) {
 793         destroy_window(o_walk);
 794         FREE(o_walk->workspaces);
 795         FREE(o_walk->name);
 796     }
 797     FREE_SLIST(outputs, i3_output);
 798     FREE(outputs);
 799
 800     xcb_disconnect(xcb_connection);
 801
 802     ev_check_stop(main_loop, xcb_chk);
 803     ev_prepare_stop(main_loop, xcb_prep);
 804     ev_io_stop(main_loop, xcb_io);
 805
 806     FREE(xcb_chk);
 807     FREE(xcb_prep);
 808     FREE(xcb_io);
 809     FREE(font_info);
 810 }
 811
 812 /*
 813  * Get the earlier requested atoms and save them in the prepared data structure
 814  *
 815  */
 816 void get_atoms() {
 817     xcb_intern_atom_reply_t *reply;
 818     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
 819         if (reply == NULL) { \
 820             ELOG("Could not get atom %s\n", #name); \
 821             exit(EXIT_FAILURE); \
 822         } \
 823         atoms[name] = reply->atom; \
 824         free(reply);
 825
 826     #include "xcb_atoms.def"
 827     DLOG("Got Atoms\n");
 828 }
 829
 830 /*
 831  * Destroy the bar of the specified output
 832  *
 833  */
 834 void destroy_window(i3_output *output) {
 835     if (output == NULL) {
 836         return;
 837     }
 838     if (output->bar == XCB_NONE) {
 839         return;
 840     }
 841     xcb_destroy_window(xcb_connection, output->bar);
 842     output->bar = XCB_NONE;
 843 }
 844
 845 /*
 846  * Reallocate the statusline-buffer
 847  *
 848  */
 849 void realloc_sl_buffer() {
 850     xcb_free_pixmap(xcb_connection, statusline_pm);
 851     statusline_pm = xcb_generate_id(xcb_connection);
 852     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 853                                                                xcb_screen->root_depth,
 854                                                                statusline_pm,
 855                                                                xcb_root,
 856                                                                xcb_screen->width_in_pixels,
 857                                                                xcb_screen->height_in_pixels);
 858
 859     uint32_t mask = XCB_GC_FOREGROUND;
 860     uint32_t vals[3] = { colors.bar_bg, colors.bar_bg, xcb_font };
 861     xcb_free_gc(xcb_connection, statusline_clear);
 862     statusline_clear = xcb_generate_id(xcb_connection);
 863     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 864                                                                statusline_clear,
 865                                                                xcb_root,
 866                                                                mask,
 867                                                                vals);
 868
 869     mask |= XCB_GC_BACKGROUND | XCB_GC_FONT;
 870     vals[0] = colors.bar_fg;
 871     statusline_ctx = xcb_generate_id(xcb_connection);
 872     xcb_free_gc(xcb_connection, statusline_ctx);
 873     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 874                                                             statusline_ctx,
 875                                                             xcb_root,
 876                                                             mask,
 877                                                             vals);
 878
 879     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 880         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 881         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 882         exit(EXIT_FAILURE);
 883     }
 884
 885 }
 886
 887 /*
 888  * Reconfigure all bars and create new bars for recently activated outputs
 889  *
 890  */
 891 void reconfig_windows() {
 892     uint32_t mask;
 893     uint32_t values[5];
 894
 895     i3_output *walk;
 896     SLIST_FOREACH(walk, outputs, slist) {
 897         if (!walk->active) {
 898             /* If an output is not active, we destroy its bar */
 899             /* FIXME: Maybe we rather want to unmap? */
 900             DLOG("Destroying window for output %s\n", walk->name);
 901             destroy_window(walk);
 902             continue;
 903         }
 904         if (walk->bar == XCB_NONE) {
 905             DLOG("Creating Window for output %s\n", walk->name);
 906
 907             /* TODO: only call init_tray() if the tray is configured for this output */
 908             init_tray();
 909
 910             walk->bar = xcb_generate_id(xcb_connection);
 911             walk->buffer = xcb_generate_id(xcb_connection);
 912             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 913             /* Black background */
 914             values[0] = colors.bar_bg;
 915             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
 916             values[1] = config.hide_on_modifier;
 917             /* The events we want to receive */
 918             values[2] = XCB_EVENT_MASK_EXPOSURE;
 919             if (!config.disable_ws) {
 920                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
 921             }
 922             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
 923                                                                      xcb_screen->root_depth,
 924                                                                      walk->bar,
 925                                                                      xcb_root,
 926                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font_height - 6,
 927                                                                      walk->rect.w, font_height + 6,
 928                                                                      1,
 929                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
 930                                                                      xcb_screen->root_visual,
 931                                                                      mask,
 932                                                                      values);
 933
 934             /* The double-buffer we use to render stuff off-screen */
 935             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 936                                                                     xcb_screen->root_depth,
 937                                                                     walk->buffer,
 938                                                                     walk->bar,
 939                                                                     walk->rect.w,
 940                                                                     walk->rect.h);
 941
 942             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
 943              * this one */
 944             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
 945                                                                 XCB_PROP_MODE_REPLACE,
 946                                                                 walk->bar,
 947                                                                 atoms[_NET_WM_WINDOW_TYPE],
 948                                                                 XCB_ATOM_ATOM,
 949                                                                 32,
 950                                                                 1,
 951                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
 952
 953             /* We need to tell i3, where to reserve space for i3bar */
 954             /* left, right, top, bottom, left_start_y, left_end_y,
 955              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
 956              * bottom_end_x */
 957             /* A local struct to save the strut_partial property */
 958             struct {
 959                 uint32_t left;
 960                 uint32_t right;
 961                 uint32_t top;
 962                 uint32_t bottom;
 963                 uint32_t left_start_y;
 964                 uint32_t left_end_y;
 965                 uint32_t right_start_y;
 966                 uint32_t right_end_y;
 967                 uint32_t top_start_x;
 968                 uint32_t top_end_x;
 969                 uint32_t bottom_start_x;
 970                 uint32_t bottom_end_x;
 971             } __attribute__((__packed__)) strut_partial = {0,};
 972             switch (config.dockpos) {
 973                 case DOCKPOS_NONE:
 974                     break;
 975                 case DOCKPOS_TOP:
 976                     strut_partial.top = font_height + 6;
 977                     strut_partial.top_start_x = walk->rect.x;
 978                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
 979                     break;
 980                 case DOCKPOS_BOT:
 981                     strut_partial.bottom = font_height + 6;
 982                     strut_partial.bottom_start_x = walk->rect.x;
 983                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
 984                     break;
 985             }
 986             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
 987                                                                  XCB_PROP_MODE_REPLACE,
 988                                                                  walk->bar,
 989                                                                  atoms[_NET_WM_STRUT_PARTIAL],
 990                                                                  XCB_ATOM_CARDINAL,
 991                                                                  32,
 992                                                                  12,
 993                                                                  &strut_partial);
 994
 995             /* We also want a graphics-context for the bars (it defines the properties
 996              * with which we draw to them) */
 997             walk->bargc = xcb_generate_id(xcb_connection);
 998             mask = XCB_GC_FONT;
 999             values[0] = xcb_font;
1000             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
1001                                                                 walk->bargc,
1002                                                                 walk->bar,
1003                                                                 mask,
1004                                                                 values);
1005
1006             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
1007             xcb_void_cookie_t map_cookie;
1008             if (!config.hide_on_modifier) {
1009                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
1010             }
1011
1012             if (xcb_request_failed(win_cookie,   "Could not create window") ||
1013                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
1014                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
1015                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
1016                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
1017                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
1018                 exit(EXIT_FAILURE);
1019             }
1020         } else {
1021             /* We already have a bar, so we just reconfigure it */
1022             mask = XCB_CONFIG_WINDOW_X |
1023                    XCB_CONFIG_WINDOW_Y |
1024                    XCB_CONFIG_WINDOW_WIDTH |
1025                    XCB_CONFIG_WINDOW_HEIGHT |
1026                    XCB_CONFIG_WINDOW_STACK_MODE;
1027             values[0] = walk->rect.x;
1028             values[1] = walk->rect.y + walk->rect.h - font_height - 6;
1029             values[2] = walk->rect.w;
1030             values[3] = font_height + 6;
1031             values[4] = XCB_STACK_MODE_ABOVE;
1032
1033             DLOG("Destroying buffer for output %s", walk->name);
1034             xcb_free_pixmap(xcb_connection, walk->buffer);
1035
1036             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
1037             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
1038                                                                         walk->bar,
1039                                                                         mask,
1040                                                                         values);
1041
1042             DLOG("Recreating buffer for output %s", walk->name);
1043             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1044                                                                     xcb_screen->root_depth,
1045                                                                     walk->buffer,
1046                                                                     walk->bar,
1047                                                                     walk->rect.w,
1048                                                                     walk->rect.h);
1049
1050             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
1051                 exit(EXIT_FAILURE);
1052             }
1053             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
1054                 exit(EXIT_FAILURE);
1055             }
1056         }
1057     }
1058 }
1059
1060 /*
1061  * Render the bars, with buttons and statusline
1062  *
1063  */
1064 void draw_bars() {
1065     DLOG("Drawing Bars...\n");
1066     int i = 0;
1067
1068     refresh_statusline();
1069
1070     i3_output *outputs_walk;
1071     SLIST_FOREACH(outputs_walk, outputs, slist) {
1072         if (!outputs_walk->active) {
1073             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
1074             continue;
1075         }
1076         if (outputs_walk->bar == XCB_NONE) {
1077             /* Oh shit, an active output without an own bar. Create it now! */
1078             reconfig_windows();
1079         }
1080         /* First things first: clear the backbuffer */
1081         uint32_t color = colors.bar_bg;
1082         xcb_change_gc(xcb_connection,
1083                       outputs_walk->bargc,
1084                       XCB_GC_FOREGROUND,
1085                       &color);
1086         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
1087         xcb_poly_fill_rectangle(xcb_connection,
1088                                 outputs_walk->buffer,
1089                                 outputs_walk->bargc,
1090                                 1,
1091                                 &rect);
1092
1093         if (statusline != NULL) {
1094             DLOG("Printing statusline!\n");
1095
1096             /* Luckily we already prepared a seperate pixmap containing the rendered
1097              * statusline, we just have to copy the relevant parts to the relevant
1098              * position */
1099             trayclient *trayclient;
1100             int traypx = 0;
1101             TAILQ_FOREACH(trayclient, outputs_walk->trayclients, tailq) {
1102                 /* We assume the tray icons are quadratic (we use the font
1103                  * *height* as *width* of the icons) because we configured them
1104                  * like this. */
1105                 traypx += font_height;
1106             }
1107             /* Add 2px of padding if there are any tray icons */
1108             if (traypx > 0)
1109                 traypx += 2;
1110             xcb_copy_area(xcb_connection,
1111                           statusline_pm,
1112                           outputs_walk->buffer,
1113                           outputs_walk->bargc,
1114                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
1115                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - traypx - 4)), 3,
1116                           MIN(outputs_walk->rect.w - traypx - 4, statusline_width), font_height);
1117         }
1118
1119         if (config.disable_ws) {
1120             continue;
1121         }
1122
1123         i3_ws *ws_walk;
1124         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
1125             DLOG("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
1126             uint32_t fg_color = colors.inactive_ws_fg;
1127             uint32_t bg_color = colors.inactive_ws_bg;
1128             if (ws_walk->visible) {
1129                 if (!ws_walk->focused) {
1130                     fg_color = colors.active_ws_fg;
1131                     bg_color = colors.active_ws_bg;
1132                 } else {
1133                     fg_color = colors.focus_ws_fg;
1134                     bg_color = colors.focus_ws_bg;
1135                 }
1136             }
1137             if (ws_walk->urgent) {
1138                 DLOG("WS %s is urgent!\n", ws_walk->name);
1139                 fg_color = colors.urgent_ws_fg;
1140                 bg_color = colors.urgent_ws_bg;
1141                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
1142                 unhide_bars();
1143             }
1144             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
1145             uint32_t vals[] = { bg_color, bg_color };
1146             xcb_change_gc(xcb_connection,
1147                           outputs_walk->bargc,
1148                           mask,
1149                           vals);
1150             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
1151             xcb_poly_fill_rectangle(xcb_connection,
1152                                     outputs_walk->buffer,
1153                                     outputs_walk->bargc,
1154                                     1,
1155                                     &rect);
1156             xcb_change_gc(xcb_connection,
1157                           outputs_walk->bargc,
1158                           XCB_GC_FOREGROUND,
1159                           &fg_color);
1160             xcb_image_text_16(xcb_connection,
1161                               ws_walk->name_glyphs,
1162                               outputs_walk->buffer,
1163                               outputs_walk->bargc,
1164                               i + 5, font_info->font_ascent + 2,
1165                               ws_walk->ucs2_name);
1166             i += 10 + ws_walk->name_width;
1167         }
1168
1169         i = 0;
1170     }
1171
1172     redraw_bars();
1173 }
1174
1175 /*
1176  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1177  *
1178  */
1179 void redraw_bars() {
1180     i3_output *outputs_walk;
1181     SLIST_FOREACH(outputs_walk, outputs, slist) {
1182         if (!outputs_walk->active) {
1183             continue;
1184         }
1185         xcb_copy_area(xcb_connection,
1186                       outputs_walk->buffer,
1187                       outputs_walk->bar,
1188                       outputs_walk->bargc,
1189                       0, 0,
1190                       0, 0,
1191                       outputs_walk->rect.w,
1192                       outputs_walk->rect.h);
1193         xcb_flush(xcb_connection);
1194     }
1195 }