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   1 /*
   2  * vim:ts=4:sw=4:expandtab
   3  *
   4  * i3bar - an xcb-based status- and ws-bar for i3
   5  * © 2010-2011 Axel Wagner and contributors (see also: LICENSE)
   6  *
   7  * xcb.c: Communicating with X
   8  *
   9  */
  10 #include <xcb/xcb.h>
  11 #include <xcb/xproto.h>
  12 #include <xcb/xcb_atom.h>
  13
  14 #ifdef XCB_COMPAT
  15 #include "xcb_compat.h"
  16 #endif
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <string.h>
  23 #include <i3/ipc.h>
  24 #include <ev.h>
  25 #include <errno.h>
  26 #include <limits.h>
  27 #include <err.h>
  28
  29 #include <X11/Xlib.h>
  30 #include <X11/XKBlib.h>
  31 #include <X11/extensions/XKB.h>
  32
  33 #include "common.h"
  34 #include "libi3.h"
  35
  36 /* We save the Atoms in an easy to access array, indexed by an enum */
  37 enum {
  38     #define ATOM_DO(name) name,
  39     #include "xcb_atoms.def"
  40     NUM_ATOMS
  41 };
  42
  43 xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
  44 xcb_atom_t               atoms[NUM_ATOMS];
  45
  46 /* Variables, that are the same for all functions at all times */
  47 xcb_connection_t *xcb_connection;
  48 int              screen;
  49 xcb_screen_t     *xcb_screen;
  50 xcb_window_t     xcb_root;
  51
  52 /* This is needed for integration with libi3 */
  53 xcb_connection_t *conn;
  54
  55 /* The font we'll use */
  56 static i3Font font;
  57
  58 /* These are only relevant for XKB, which we only need for grabbing modifiers */
  59 Display          *xkb_dpy;
  60 int              xkb_event_base;
  61 int              mod_pressed = 0;
  62
  63 /* Because the statusline is the same on all outputs, we have
  64  * global buffer to render it on */
  65 xcb_gcontext_t   statusline_ctx;
  66 xcb_gcontext_t   statusline_clear;
  67 xcb_pixmap_t     statusline_pm;
  68 uint32_t         statusline_width;
  69
  70 /* Event-Watchers, to interact with the user */
  71 ev_prepare *xcb_prep;
  72 ev_check   *xcb_chk;
  73 ev_io      *xcb_io;
  74 ev_io      *xkb_io;
  75
  76 /* The parsed colors */
  77 struct xcb_colors_t {
  78     uint32_t bar_fg;
  79     uint32_t bar_bg;
  80     uint32_t active_ws_fg;
  81     uint32_t active_ws_bg;
  82     uint32_t active_ws_border;
  83     uint32_t inactive_ws_fg;
  84     uint32_t inactive_ws_bg;
  85     uint32_t inactive_ws_border;
  86     uint32_t urgent_ws_bg;
  87     uint32_t urgent_ws_fg;
  88     uint32_t urgent_ws_border;
  89     uint32_t focus_ws_bg;
  90     uint32_t focus_ws_fg;
  91     uint32_t focus_ws_border;
  92 };
  93 struct xcb_colors_t colors;
  94
  95 /* We define xcb_request_failed as a macro to include the relevant line-number */
  96 #define xcb_request_failed(cookie, err_msg) _xcb_request_failed(cookie, err_msg, __LINE__)
  97 int _xcb_request_failed(xcb_void_cookie_t cookie, char *err_msg, int line) {
  98     xcb_generic_error_t *err;
  99     if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
 100         fprintf(stderr, "[%s:%d] ERROR: %s. X Error Code: %d\n", __FILE__, line, err_msg, err->error_code);
 101         return err->error_code;
 102     }
 103     return 0;
 104 }
 105
 106 /*
 107  * Redraws the statusline to the buffer
 108  *
 109  */
 110 void refresh_statusline() {
 111     size_t glyph_count;
 112
 113     if (statusline == NULL) {
 114         return;
 115     }
 116
 117     xcb_char2b_t *text = (xcb_char2b_t*)convert_utf8_to_ucs2(statusline, &glyph_count);
 118     uint32_t old_statusline_width = statusline_width;
 119     statusline_width = predict_text_width((char*)text, glyph_count, true);
 120     /* If the statusline is bigger than our screen we need to make sure that
 121      * the pixmap provides enough space, so re-allocate if the width grew */
 122     if (statusline_width > xcb_screen->width_in_pixels &&
 123         statusline_width > old_statusline_width)
 124         realloc_sl_buffer();
 125
 126     xcb_rectangle_t rect = { 0, 0, xcb_screen->width_in_pixels, font.height };
 127     xcb_poly_fill_rectangle(xcb_connection, statusline_pm, statusline_clear, 1, &rect);
 128     set_font_colors(statusline_ctx, colors.bar_fg, colors.bar_bg);
 129     draw_text((char*)text, glyph_count, true, statusline_pm, statusline_ctx,
 130             0, 0, xcb_screen->width_in_pixels);
 131
 132     FREE(text);
 133 }
 134
 135 /*
 136  * Hides all bars (unmaps them)
 137  *
 138  */
 139 void hide_bars() {
 140     if (!config.hide_on_modifier) {
 141         return;
 142     }
 143
 144     i3_output *walk;
 145     SLIST_FOREACH(walk, outputs, slist) {
 146         if (!walk->active) {
 147             continue;
 148         }
 149         xcb_unmap_window(xcb_connection, walk->bar);
 150     }
 151     stop_child();
 152 }
 153
 154 /*
 155  * Unhides all bars (maps them)
 156  *
 157  */
 158 void unhide_bars() {
 159     if (!config.hide_on_modifier) {
 160         return;
 161     }
 162
 163     i3_output           *walk;
 164     xcb_void_cookie_t   cookie;
 165     uint32_t            mask;
 166     uint32_t            values[5];
 167
 168     cont_child();
 169
 170     SLIST_FOREACH(walk, outputs, slist) {
 171         if (walk->bar == XCB_NONE) {
 172             continue;
 173         }
 174         mask = XCB_CONFIG_WINDOW_X |
 175                XCB_CONFIG_WINDOW_Y |
 176                XCB_CONFIG_WINDOW_WIDTH |
 177                XCB_CONFIG_WINDOW_HEIGHT |
 178                XCB_CONFIG_WINDOW_STACK_MODE;
 179         values[0] = walk->rect.x;
 180         if (config.position == POS_TOP)
 181             values[1] = walk->rect.y;
 182         else values[1] = walk->rect.y + walk->rect.h - font.height - 6;
 183         values[2] = walk->rect.w;
 184         values[3] = font.height + 6;
 185         values[4] = XCB_STACK_MODE_ABOVE;
 186         DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
 187         cookie = xcb_configure_window_checked(xcb_connection,
 188                                               walk->bar,
 189                                               mask,
 190                                               values);
 191
 192         if (xcb_request_failed(cookie, "Could not reconfigure window")) {
 193             exit(EXIT_FAILURE);
 194         }
 195         xcb_map_window(xcb_connection, walk->bar);
 196     }
 197 }
 198
 199 /*
 200  * Parse the colors into a format that we can use
 201  *
 202  */
 203 void init_colors(const struct xcb_color_strings_t *new_colors) {
 204 #define PARSE_COLOR(name, def) \
 205     do { \
 206         colors.name = get_colorpixel(new_colors->name ? new_colors->name : def); \
 207     } while  (0)
 208     PARSE_COLOR(bar_fg, "#FFFFFF");
 209     PARSE_COLOR(bar_bg, "#000000");
 210     PARSE_COLOR(active_ws_fg, "#FFFFFF");
 211     PARSE_COLOR(active_ws_bg, "#333333");
 212     PARSE_COLOR(active_ws_border, "#333333");
 213     PARSE_COLOR(inactive_ws_fg, "#888888");
 214     PARSE_COLOR(inactive_ws_bg, "#222222");
 215     PARSE_COLOR(inactive_ws_border, "#333333");
 216     PARSE_COLOR(urgent_ws_fg, "#FFFFFF");
 217     PARSE_COLOR(urgent_ws_bg, "#900000");
 218     PARSE_COLOR(urgent_ws_border, "#2f343a");
 219     PARSE_COLOR(focus_ws_fg, "#FFFFFF");
 220     PARSE_COLOR(focus_ws_bg, "#285577");
 221     PARSE_COLOR(focus_ws_border, "#4c7899");
 222 #undef PARSE_COLOR
 223 }
 224
 225 /*
 226  * Handle a button-press-event (i.e. a mouse click on one of our bars).
 227  * We determine, whether the click occured on a ws-button or if the scroll-
 228  * wheel was used and change the workspace appropriately
 229  *
 230  */
 231 void handle_button(xcb_button_press_event_t *event) {
 232     i3_ws *cur_ws;
 233
 234     /* Determine, which bar was clicked */
 235     i3_output *walk;
 236     xcb_window_t bar = event->event;
 237     SLIST_FOREACH(walk, outputs, slist) {
 238         if (walk->bar == bar) {
 239             break;
 240         }
 241     }
 242
 243     if (walk == NULL) {
 244         DLOG("Unknown Bar klicked!\n");
 245         return;
 246     }
 247
 248     /* TODO: Move this to extern get_ws_for_output() */
 249     TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 250         if (cur_ws->visible) {
 251             break;
 252         }
 253     }
 254
 255     if (cur_ws == NULL) {
 256         DLOG("No Workspace active?\n");
 257         return;
 258     }
 259
 260     int32_t x = event->event_x;
 261
 262     DLOG("Got Button %d\n", event->detail);
 263
 264     switch (event->detail) {
 265         case 1:
 266             /* Left Mousbutton. We determine, which button was clicked
 267              * and set cur_ws accordingly */
 268             TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
 269                 DLOG("x = %d\n", x);
 270                 if (x >= 0 && x < cur_ws->name_width + 10) {
 271                     break;
 272                 }
 273                 x -= cur_ws->name_width + 11;
 274             }
 275             if (cur_ws == NULL) {
 276                 return;
 277             }
 278             break;
 279         case 4:
 280             /* Mouse wheel down. We select the next ws */
 281             if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
 282                 cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
 283             } else {
 284                 cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
 285             }
 286             break;
 287         case 5:
 288             /* Mouse wheel up. We select the previos ws */
 289             if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
 290                 cur_ws = TAILQ_FIRST(walk->workspaces);
 291             } else {
 292                 cur_ws = TAILQ_NEXT(cur_ws, tailq);
 293             }
 294             break;
 295     }
 296
 297     /* To properly handle workspace names with double quotes in them, we need
 298      * to escape the double quotes. Unfortunately, that’s rather ugly in C: We
 299      * first count the number of double quotes, then we allocate a large enough
 300      * buffer, then we copy character by character. */
 301     int num_quotes = 0;
 302     size_t namelen = 0;
 303     for (char *walk = cur_ws->name; *walk != '\0'; walk++) {
 304         if (*walk == '"')
 305             num_quotes++;
 306         /* While we’re looping through the name anyway, we can save one
 307          * strlen(). */
 308         namelen++;
 309     }
 310
 311     const size_t len = namelen + strlen("workspace \"\"") + 1;
 312     char *buffer = scalloc(len+num_quotes);
 313     strncpy(buffer, "workspace \"", strlen("workspace \""));
 314     int inpos, outpos;
 315     for (inpos = 0, outpos = strlen("workspace \"");
 316          inpos < namelen;
 317          inpos++, outpos++) {
 318         if (cur_ws->name[inpos] == '"') {
 319             buffer[outpos] = '\\';
 320             outpos++;
 321         }
 322         buffer[outpos] = cur_ws->name[inpos];
 323     }
 324     buffer[++outpos] = '"';
 325     i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
 326     free(buffer);
 327 }
 328
 329 /*
 330  * Configures the x coordinate of all trayclients. To be called after adding a
 331  * new tray client or removing an old one.
 332  *
 333  */
 334 static void configure_trayclients() {
 335     trayclient *trayclient;
 336     i3_output *output;
 337     SLIST_FOREACH(output, outputs, slist) {
 338         if (!output->active)
 339             continue;
 340
 341         int clients = 0;
 342         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 343             if (!trayclient->mapped)
 344                 continue;
 345             clients++;
 346
 347             DLOG("Configuring tray window %08x to x=%d\n",
 348                  trayclient->win, output->rect.w - (clients * (font.height + 2)));
 349             uint32_t x = output->rect.w - (clients * (font.height + 2));
 350             xcb_configure_window(xcb_connection,
 351                                  trayclient->win,
 352                                  XCB_CONFIG_WINDOW_X,
 353                                  &x);
 354         }
 355     }
 356 }
 357
 358 /*
 359  * Handles ClientMessages (messages sent from another client directly to us).
 360  *
 361  * At the moment, only the tray window will receive client messages. All
 362  * supported client messages currently are _NET_SYSTEM_TRAY_OPCODE.
 363  *
 364  */
 365 static void handle_client_message(xcb_client_message_event_t* event) {
 366     if (event->type == atoms[_NET_SYSTEM_TRAY_OPCODE] &&
 367         event->format == 32) {
 368         DLOG("_NET_SYSTEM_TRAY_OPCODE received\n");
 369         /* event->data.data32[0] is the timestamp */
 370         uint32_t op = event->data.data32[1];
 371         uint32_t mask;
 372         uint32_t values[2];
 373         if (op == SYSTEM_TRAY_REQUEST_DOCK) {
 374             xcb_window_t client = event->data.data32[2];
 375
 376             /* Listen for PropertyNotify events to get the most recent value of
 377              * the XEMBED_MAPPED atom, also listen for UnmapNotify events */
 378             mask = XCB_CW_EVENT_MASK;
 379             values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
 380                         XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 381             xcb_change_window_attributes(xcb_connection,
 382                                          client,
 383                                          mask,
 384                                          values);
 385
 386             /* Request the _XEMBED_INFO property. The XEMBED specification
 387              * (which is referred by the tray specification) says this *has* to
 388              * be set, but VLC does not set it… */
 389             bool map_it = true;
 390             int xe_version = 1;
 391             xcb_get_property_cookie_t xembedc;
 392             xcb_generic_error_t *error;
 393             xembedc = xcb_get_property(xcb_connection,
 394                                        0,
 395                                        client,
 396                                        atoms[_XEMBED_INFO],
 397                                        XCB_GET_PROPERTY_TYPE_ANY,
 398                                        0,
 399                                        2 * 32);
 400
 401             xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 402                                                                        xembedc,
 403                                                                        &error);
 404             if (error != NULL) {
 405                 ELOG("Error getting _XEMBED_INFO property: error_code %d\n",
 406                      error->error_code);
 407                 free(error);
 408                 return;
 409             }
 410             if (xembedr != NULL && xembedr->length != 0) {
 411                 DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 412                 uint32_t *xembed = xcb_get_property_value(xembedr);
 413                 DLOG("xembed version = %d\n", xembed[0]);
 414                 DLOG("xembed flags = %d\n", xembed[1]);
 415                 map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 416                 xe_version = xembed[0];
 417                 if (xe_version > 1)
 418                     xe_version = 1;
 419                 free(xembedr);
 420             } else {
 421                 ELOG("Window %08x violates the XEMBED protocol, _XEMBED_INFO not set\n", client);
 422             }
 423
 424             DLOG("X window %08x requested docking\n", client);
 425             i3_output *walk, *output = NULL;
 426             SLIST_FOREACH(walk, outputs, slist) {
 427                 if (!walk->active)
 428                     continue;
 429                 if (config.tray_output &&
 430                     strcasecmp(walk->name, config.tray_output) != 0)
 431                     continue;
 432                 DLOG("using output %s\n", walk->name);
 433                 output = walk;
 434             }
 435             if (output == NULL) {
 436                 ELOG("No output found\n");
 437                 return;
 438             }
 439             xcb_reparent_window(xcb_connection,
 440                                 client,
 441                                 output->bar,
 442                                 output->rect.w - font.height - 2,
 443                                 2);
 444             /* We reconfigure the window to use a reasonable size. The systray
 445              * specification explicitly says:
 446              *   Tray icons may be assigned any size by the system tray, and
 447              *   should do their best to cope with any size effectively
 448              */
 449             mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
 450             values[0] = font.height;
 451             values[1] = font.height;
 452             xcb_configure_window(xcb_connection,
 453                                  client,
 454                                  mask,
 455                                  values);
 456
 457             /* send the XEMBED_EMBEDDED_NOTIFY message */
 458             void *event = scalloc(32);
 459             xcb_client_message_event_t *ev = event;
 460             ev->response_type = XCB_CLIENT_MESSAGE;
 461             ev->window = client;
 462             ev->type = atoms[_XEMBED];
 463             ev->format = 32;
 464             ev->data.data32[0] = XCB_CURRENT_TIME;
 465             ev->data.data32[1] = atoms[XEMBED_EMBEDDED_NOTIFY];
 466             ev->data.data32[2] = output->bar;
 467             ev->data.data32[3] = xe_version;
 468             xcb_send_event(xcb_connection,
 469                            0,
 470                            client,
 471                            XCB_EVENT_MASK_NO_EVENT,
 472                            (char*)ev);
 473             free(event);
 474
 475             /* Put the client inside the save set. Upon termination (whether
 476              * killed or normal exit does not matter) of i3bar, these clients
 477              * will be correctly reparented to their most closest living
 478              * ancestor. Without this, tray icons might die when i3bar
 479              * exits/crashes. */
 480             xcb_change_save_set(xcb_connection, XCB_SET_MODE_INSERT, client);
 481
 482             if (map_it) {
 483                 DLOG("Mapping dock client\n");
 484                 xcb_map_window(xcb_connection, client);
 485             } else {
 486                 DLOG("Not mapping dock client yet\n");
 487             }
 488             trayclient *tc = smalloc(sizeof(trayclient));
 489             tc->win = client;
 490             tc->mapped = map_it;
 491             tc->xe_version = xe_version;
 492             TAILQ_INSERT_TAIL(output->trayclients, tc, tailq);
 493
 494             /* Trigger an update to copy the statusline text to the appropriate
 495              * position */
 496             configure_trayclients();
 497             draw_bars();
 498         }
 499     }
 500 }
 501
 502 /*
 503  * Handles UnmapNotify events. These events happen when a tray window unmaps
 504  * itself. We then update our data structure
 505  *
 506  */
 507 static void handle_unmap_notify(xcb_unmap_notify_event_t* event) {
 508     DLOG("UnmapNotify for window = %08x, event = %08x\n", event->window, event->event);
 509
 510     i3_output *walk;
 511     SLIST_FOREACH(walk, outputs, slist) {
 512         if (!walk->active)
 513             continue;
 514         DLOG("checking output %s\n", walk->name);
 515         trayclient *trayclient;
 516         TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
 517             if (trayclient->win != event->window)
 518                 continue;
 519
 520             DLOG("Removing tray client with window ID %08x\n", event->window);
 521             TAILQ_REMOVE(walk->trayclients, trayclient, tailq);
 522
 523             /* Trigger an update, we now have more space for the statusline */
 524             configure_trayclients();
 525             draw_bars();
 526             return;
 527         }
 528     }
 529 }
 530
 531 /*
 532  * Handle PropertyNotify messages. Currently only the _XEMBED_INFO property is
 533  * handled, which tells us whether a dock client should be mapped or unmapped.
 534  *
 535  */
 536 static void handle_property_notify(xcb_property_notify_event_t *event) {
 537     DLOG("PropertyNotify\n");
 538     if (event->atom == atoms[_XEMBED_INFO] &&
 539         event->state == XCB_PROPERTY_NEW_VALUE) {
 540         DLOG("xembed_info updated\n");
 541         trayclient *trayclient = NULL, *walk;
 542         i3_output *o_walk;
 543         SLIST_FOREACH(o_walk, outputs, slist) {
 544             if (!o_walk->active)
 545                 continue;
 546
 547             TAILQ_FOREACH(walk, o_walk->trayclients, tailq) {
 548                 if (walk->win != event->window)
 549                     continue;
 550                 trayclient = walk;
 551                 break;
 552             }
 553
 554             if (trayclient)
 555                 break;
 556         }
 557         if (!trayclient) {
 558             ELOG("PropertyNotify received for unknown window %08x\n",
 559                  event->window);
 560             return;
 561         }
 562         xcb_get_property_cookie_t xembedc;
 563         xembedc = xcb_get_property_unchecked(xcb_connection,
 564                                              0,
 565                                              trayclient->win,
 566                                              atoms[_XEMBED_INFO],
 567                                              XCB_GET_PROPERTY_TYPE_ANY,
 568                                              0,
 569                                              2 * 32);
 570
 571         xcb_get_property_reply_t *xembedr = xcb_get_property_reply(xcb_connection,
 572                                                                    xembedc,
 573                                                                    NULL);
 574         if (xembedr == NULL || xembedr->length == 0) {
 575             DLOG("xembed_info unset\n");
 576             return;
 577         }
 578
 579         DLOG("xembed format = %d, len = %d\n", xembedr->format, xembedr->length);
 580         uint32_t *xembed = xcb_get_property_value(xembedr);
 581         DLOG("xembed version = %d\n", xembed[0]);
 582         DLOG("xembed flags = %d\n", xembed[1]);
 583         bool map_it = ((xembed[1] & XEMBED_MAPPED) == XEMBED_MAPPED);
 584         DLOG("map-state now %d\n", map_it);
 585         if (trayclient->mapped && !map_it) {
 586             /* need to unmap the window */
 587             xcb_unmap_window(xcb_connection, trayclient->win);
 588             trayclient->mapped = map_it;
 589             configure_trayclients();
 590             draw_bars();
 591         } else if (!trayclient->mapped && map_it) {
 592             /* need to map the window */
 593             xcb_map_window(xcb_connection, trayclient->win);
 594             trayclient->mapped = map_it;
 595             configure_trayclients();
 596             draw_bars();
 597         }
 598         free(xembedr);
 599     }
 600 }
 601
 602 /*
 603  * Handle ConfigureRequests by denying them and sending the client a
 604  * ConfigureNotify with its actual size.
 605  *
 606  */
 607 static void handle_configure_request(xcb_configure_request_event_t *event) {
 608     DLOG("ConfigureRequest for window = %08x\n", event->window);
 609
 610     trayclient *trayclient;
 611     i3_output *output;
 612     SLIST_FOREACH(output, outputs, slist) {
 613         if (!output->active)
 614             continue;
 615
 616         int clients = 0;
 617         TAILQ_FOREACH_REVERSE(trayclient, output->trayclients, tc_head, tailq) {
 618             if (!trayclient->mapped)
 619                 continue;
 620             clients++;
 621
 622             if (trayclient->win != event->window)
 623                 continue;
 624
 625             xcb_rectangle_t rect;
 626             rect.x = output->rect.w - (clients * (font.height + 2));
 627             rect.y = 2;
 628             rect.width = font.height;
 629             rect.height = font.height;
 630
 631             DLOG("This is a tray window. x = %d\n", rect.x);
 632             fake_configure_notify(xcb_connection, rect, event->window, 0);
 633             return;
 634         }
 635     }
 636
 637     DLOG("WARNING: Could not find corresponding tray window.\n");
 638 }
 639
 640 /*
 641  * This function is called immediately before the main loop locks. We flush xcb
 642  * then (and only then)
 643  *
 644  */
 645 void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revents) {
 646     xcb_flush(xcb_connection);
 647 }
 648
 649 /*
 650  * This function is called immediately after the main loop locks, so when one
 651  * of the watchers registered an event.
 652  * We check whether an X-Event arrived and handle it.
 653  *
 654  */
 655 void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
 656     xcb_generic_event_t *event;
 657
 658     if (xcb_connection_has_error(xcb_connection)) {
 659         ELOG("X11 connection was closed unexpectedly - maybe your X server terminated / crashed?\n");
 660         exit(1);
 661     }
 662
 663     while ((event = xcb_poll_for_event(xcb_connection)) != NULL) {
 664         switch (event->response_type & ~0x80) {
 665             case XCB_EXPOSE:
 666                 /* Expose-events happen, when the window needs to be redrawn */
 667                 redraw_bars();
 668                 break;
 669             case XCB_BUTTON_PRESS:
 670                 /* Button-press-events are mouse-buttons clicked on one of our bars */
 671                 handle_button((xcb_button_press_event_t*) event);
 672                 break;
 673             case XCB_CLIENT_MESSAGE:
 674                 /* Client messages are used for client-to-client communication, for
 675                  * example system tray widgets talk to us directly via client messages. */
 676                 handle_client_message((xcb_client_message_event_t*) event);
 677                 break;
 678             case XCB_UNMAP_NOTIFY:
 679             case XCB_DESTROY_NOTIFY:
 680                 /* UnmapNotifies are received when a tray window unmaps itself */
 681                 handle_unmap_notify((xcb_unmap_notify_event_t*) event);
 682                 break;
 683             case XCB_PROPERTY_NOTIFY:
 684                 /* PropertyNotify */
 685                 handle_property_notify((xcb_property_notify_event_t*) event);
 686                 break;
 687             case XCB_CONFIGURE_REQUEST:
 688                 /* ConfigureRequest, sent by a tray child */
 689                 handle_configure_request((xcb_configure_request_event_t*) event);
 690                 break;
 691         }
 692         free(event);
 693     }
 694 }
 695
 696 /*
 697  * Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
 698  * are triggered
 699  *
 700  */
 701 void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 702 }
 703
 704 /*
 705  * We need to bind to the modifier per XKB. Sadly, XCB does not implement this
 706  *
 707  */
 708 void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
 709     XkbEvent ev;
 710     int modstate = 0;
 711
 712     DLOG("Got XKB-Event!\n");
 713
 714     while (XPending(xkb_dpy)) {
 715         XNextEvent(xkb_dpy, (XEvent*)&ev);
 716
 717         if (ev.type != xkb_event_base) {
 718             ELOG("No Xkb-Event!\n");
 719             continue;
 720         }
 721
 722         if (ev.any.xkb_type != XkbStateNotify) {
 723             ELOG("No State Notify!\n");
 724             continue;
 725         }
 726
 727         unsigned int mods = ev.state.mods;
 728         modstate = mods & config.modifier;
 729     }
 730
 731 #define DLOGMOD(modmask, status, barfunc) \
 732     do { \
 733         switch (modmask) { \
 734             case ShiftMask: \
 735                 DLOG("ShiftMask got " #status "!\n"); \
 736                 break; \
 737             case ControlMask: \
 738                 DLOG("ControlMask got " #status "!\n"); \
 739                 break; \
 740             case Mod1Mask: \
 741                 DLOG("Mod1Mask got " #status "!\n"); \
 742                 break; \
 743             case Mod2Mask: \
 744                 DLOG("Mod2Mask got " #status "!\n"); \
 745                 break; \
 746             case Mod3Mask: \
 747                 DLOG("Mod3Mask got " #status "!\n"); \
 748                 break; \
 749             case Mod4Mask: \
 750                 DLOG("Mod4Mask got " #status "!\n"); \
 751                 break; \
 752             case Mod5Mask: \
 753                 DLOG("Mod5Mask got " #status "!\n"); \
 754                 break; \
 755         } \
 756         barfunc(); \
 757     } while (0)
 758
 759     if (modstate != mod_pressed) {
 760         if (modstate == 0) {
 761             DLOGMOD(config.modifier, released, hide_bars);
 762         } else {
 763             DLOGMOD(config.modifier, pressed, unhide_bars);
 764         }
 765         mod_pressed = modstate;
 766     }
 767
 768 #undef DLOGMOD
 769 }
 770
 771 /*
 772  * Early initialization of the connection to X11: Everything which does not
 773  * depend on 'config'.
 774  *
 775  */
 776 char *init_xcb_early() {
 777     /* FIXME: xcb_connect leaks Memory */
 778     xcb_connection = xcb_connect(NULL, &screen);
 779     if (xcb_connection_has_error(xcb_connection)) {
 780         ELOG("Cannot open display\n");
 781         exit(EXIT_FAILURE);
 782     }
 783     conn = xcb_connection;
 784     DLOG("Connected to xcb\n");
 785
 786     /* We have to request the atoms we need */
 787     #define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
 788     #include "xcb_atoms.def"
 789
 790     xcb_screen = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
 791     xcb_root = xcb_screen->root;
 792
 793     /* We draw the statusline to a seperate pixmap, because it looks the same on all bars and
 794      * this way, we can choose to crop it */
 795     uint32_t mask = XCB_GC_FOREGROUND;
 796     uint32_t vals[] = { colors.bar_bg, colors.bar_bg };
 797
 798     statusline_clear = xcb_generate_id(xcb_connection);
 799     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 800                                                                statusline_clear,
 801                                                                xcb_root,
 802                                                                mask,
 803                                                                vals);
 804
 805     statusline_ctx = xcb_generate_id(xcb_connection);
 806     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
 807                                                             statusline_ctx,
 808                                                             xcb_root,
 809                                                             0,
 810                                                             NULL);
 811
 812     statusline_pm = xcb_generate_id(xcb_connection);
 813     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
 814                                                                xcb_screen->root_depth,
 815                                                                statusline_pm,
 816                                                                xcb_root,
 817                                                                xcb_screen->width_in_pixels,
 818                                                                xcb_screen->height_in_pixels);
 819
 820
 821     /* The various Watchers to communicate with xcb */
 822     xcb_io = smalloc(sizeof(ev_io));
 823     xcb_prep = smalloc(sizeof(ev_prepare));
 824     xcb_chk = smalloc(sizeof(ev_check));
 825
 826     ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
 827     ev_prepare_init(xcb_prep, &xcb_prep_cb);
 828     ev_check_init(xcb_chk, &xcb_chk_cb);
 829
 830     ev_io_start(main_loop, xcb_io);
 831     ev_prepare_start(main_loop, xcb_prep);
 832     ev_check_start(main_loop, xcb_chk);
 833
 834     /* Now we get the atoms and save them in a nice data structure */
 835     get_atoms();
 836
 837     xcb_get_property_cookie_t path_cookie;
 838     path_cookie = xcb_get_property_unchecked(xcb_connection,
 839                                    0,
 840                                    xcb_root,
 841                                    atoms[I3_SOCKET_PATH],
 842                                    XCB_GET_PROPERTY_TYPE_ANY,
 843                                    0, PATH_MAX);
 844
 845     /* We check, if i3 set its socket-path */
 846     xcb_get_property_reply_t *path_reply = xcb_get_property_reply(xcb_connection,
 847                                                                   path_cookie,
 848                                                                   NULL);
 849     char *path = NULL;
 850     if (path_reply) {
 851         int len = xcb_get_property_value_length(path_reply);
 852         if (len != 0) {
 853             path = strndup(xcb_get_property_value(path_reply), len);
 854         }
 855     }
 856
 857
 858     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
 859         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
 860         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
 861         exit(EXIT_FAILURE);
 862     }
 863
 864     return path;
 865 }
 866
 867 /*
 868  * Initialization which depends on 'config' being usable. Called after the
 869  * configuration has arrived.
 870  *
 871  */
 872 void init_xcb_late(char *fontname) {
 873     if (fontname == NULL)
 874         fontname = "-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1";
 875
 876     /* Load the font */
 877     font = load_font(fontname, true);
 878     set_font(&font);
 879     DLOG("Calculated Font-height: %d\n", font.height);
 880
 881     xcb_flush(xcb_connection);
 882
 883     /* To grab modifiers without blocking other applications from receiving key-events
 884      * involving that modifier, we sadly have to use xkb which is not yet fully supported
 885      * in xcb */
 886     if (config.hide_on_modifier) {
 887         int xkb_major, xkb_minor, xkb_errbase, xkb_err;
 888         xkb_major = XkbMajorVersion;
 889         xkb_minor = XkbMinorVersion;
 890
 891         xkb_dpy = XkbOpenDisplay(NULL,
 892                                  &xkb_event_base,
 893                                  &xkb_errbase,
 894                                  &xkb_major,
 895                                  &xkb_minor,
 896                                  &xkb_err);
 897
 898         if (xkb_dpy == NULL) {
 899             ELOG("No XKB!\n");
 900             exit(EXIT_FAILURE);
 901         }
 902
 903         if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
 904             ELOG("Could not set FD_CLOEXEC on xkbdpy: %s\n", strerror(errno));
 905             exit(EXIT_FAILURE);
 906         }
 907
 908         int i1;
 909         if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
 910             ELOG("XKB not supported by X-server!\n");
 911             exit(EXIT_FAILURE);
 912         }
 913
 914         if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
 915             ELOG("Could not grab Key!\n");
 916             exit(EXIT_FAILURE);
 917         }
 918
 919         xkb_io = smalloc(sizeof(ev_io));
 920         ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
 921         ev_io_start(main_loop, xkb_io);
 922         XFlush(xkb_dpy);
 923     }
 924 }
 925
 926 /*
 927  * Initializes tray support by requesting the appropriate _NET_SYSTEM_TRAY atom
 928  * for the X11 display we are running on, then acquiring the selection for this
 929  * atom. Afterwards, tray clients will send ClientMessages to our window.
 930  *
 931  */
 932 void init_tray() {
 933     DLOG("Initializing system tray functionality\n");
 934     /* request the tray manager atom for the X11 display we are running on */
 935     char atomname[strlen("_NET_SYSTEM_TRAY_S") + 11];
 936     snprintf(atomname, strlen("_NET_SYSTEM_TRAY_S") + 11, "_NET_SYSTEM_TRAY_S%d", screen);
 937     xcb_intern_atom_cookie_t tray_cookie;
 938     xcb_intern_atom_reply_t *tray_reply;
 939     tray_cookie = xcb_intern_atom(xcb_connection, 0, strlen(atomname), atomname);
 940
 941     /* tray support: we need a window to own the selection */
 942     xcb_window_t selwin = xcb_generate_id(xcb_connection);
 943     uint32_t selmask = XCB_CW_OVERRIDE_REDIRECT;
 944     uint32_t selval[] = { 1 };
 945     xcb_create_window(xcb_connection,
 946                       xcb_screen->root_depth,
 947                       selwin,
 948                       xcb_root,
 949                       -1, -1,
 950                       1, 1,
 951                       1,
 952                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 953                       xcb_screen->root_visual,
 954                       selmask,
 955                       selval);
 956
 957     uint32_t orientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
 958     /* set the atoms */
 959     xcb_change_property(xcb_connection,
 960                         XCB_PROP_MODE_REPLACE,
 961                         selwin,
 962                         atoms[_NET_SYSTEM_TRAY_ORIENTATION],
 963                         XCB_ATOM_CARDINAL,
 964                         32,
 965                         1,
 966                         &orientation);
 967
 968     if (!(tray_reply = xcb_intern_atom_reply(xcb_connection, tray_cookie, NULL))) {
 969         ELOG("Could not get atom %s\n", atomname);
 970         exit(EXIT_FAILURE);
 971     }
 972
 973     xcb_set_selection_owner(xcb_connection,
 974                             selwin,
 975                             tray_reply->atom,
 976                             XCB_CURRENT_TIME);
 977
 978     /* Verify that we have the selection */
 979     xcb_get_selection_owner_cookie_t selcookie;
 980     xcb_get_selection_owner_reply_t *selreply;
 981
 982     selcookie = xcb_get_selection_owner(xcb_connection, tray_reply->atom);
 983     if (!(selreply = xcb_get_selection_owner_reply(xcb_connection, selcookie, NULL))) {
 984         ELOG("Could not get selection owner for %s\n", atomname);
 985         exit(EXIT_FAILURE);
 986     }
 987
 988     if (selreply->owner != selwin) {
 989         ELOG("Could not set the %s selection. " \
 990              "Maybe another tray is already running?\n", atomname);
 991         /* NOTE that this error is not fatal. We just can’t provide tray
 992          * functionality */
 993         free(selreply);
 994         return;
 995     }
 996
 997     /* Inform clients waiting for a new _NET_SYSTEM_TRAY that we are here */
 998     void *event = scalloc(32);
 999     xcb_client_message_event_t *ev = event;
1000     ev->response_type = XCB_CLIENT_MESSAGE;
1001     ev->window = xcb_root;
1002     ev->type = atoms[MANAGER];
1003     ev->format = 32;
1004     ev->data.data32[0] = XCB_CURRENT_TIME;
1005     ev->data.data32[1] = tray_reply->atom;
1006     ev->data.data32[2] = selwin;
1007     xcb_send_event(xcb_connection,
1008                    0,
1009                    xcb_root,
1010                    XCB_EVENT_MASK_STRUCTURE_NOTIFY,
1011                    (char*)ev);
1012     free(event);
1013     free(tray_reply);
1014 }
1015
1016 /*
1017  * Cleanup the xcb-stuff.
1018  * Called once, before the program terminates.
1019  *
1020  */
1021 void clean_xcb() {
1022     i3_output *o_walk;
1023     trayclient *trayclient;
1024     free_workspaces();
1025     SLIST_FOREACH(o_walk, outputs, slist) {
1026         TAILQ_FOREACH(trayclient, o_walk->trayclients, tailq) {
1027             /* Unmap, then reparent (to root) the tray client windows */
1028             xcb_unmap_window(xcb_connection, trayclient->win);
1029             xcb_reparent_window(xcb_connection,
1030                                 trayclient->win,
1031                                 xcb_root,
1032                                 0,
1033                                 0);
1034         }
1035         destroy_window(o_walk);
1036         FREE(o_walk->trayclients);
1037         FREE(o_walk->workspaces);
1038         FREE(o_walk->name);
1039     }
1040     FREE_SLIST(outputs, i3_output);
1041     FREE(outputs);
1042
1043     xcb_flush(xcb_connection);
1044     xcb_disconnect(xcb_connection);
1045
1046     ev_check_stop(main_loop, xcb_chk);
1047     ev_prepare_stop(main_loop, xcb_prep);
1048     ev_io_stop(main_loop, xcb_io);
1049
1050     FREE(xcb_chk);
1051     FREE(xcb_prep);
1052     FREE(xcb_io);
1053 }
1054
1055 /*
1056  * Get the earlier requested atoms and save them in the prepared data structure
1057  *
1058  */
1059 void get_atoms() {
1060     xcb_intern_atom_reply_t *reply;
1061     #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
1062         if (reply == NULL) { \
1063             ELOG("Could not get atom %s\n", #name); \
1064             exit(EXIT_FAILURE); \
1065         } \
1066         atoms[name] = reply->atom; \
1067         free(reply);
1068
1069     #include "xcb_atoms.def"
1070     DLOG("Got Atoms\n");
1071 }
1072
1073 /*
1074  * Destroy the bar of the specified output
1075  *
1076  */
1077 void destroy_window(i3_output *output) {
1078     if (output == NULL) {
1079         return;
1080     }
1081     if (output->bar == XCB_NONE) {
1082         return;
1083     }
1084     xcb_destroy_window(xcb_connection, output->bar);
1085     output->bar = XCB_NONE;
1086 }
1087
1088 /*
1089  * Reallocate the statusline-buffer
1090  *
1091  */
1092 void realloc_sl_buffer() {
1093     DLOG("Re-allocating statusline-buffer, statusline_width = %d, xcb_screen->width_in_pixels = %d\n",
1094          statusline_width, xcb_screen->width_in_pixels);
1095     xcb_free_pixmap(xcb_connection, statusline_pm);
1096     statusline_pm = xcb_generate_id(xcb_connection);
1097     xcb_void_cookie_t sl_pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1098                                                                xcb_screen->root_depth,
1099                                                                statusline_pm,
1100                                                                xcb_root,
1101                                                                MAX(xcb_screen->width_in_pixels, statusline_width),
1102                                                                xcb_screen->height_in_pixels);
1103
1104     uint32_t mask = XCB_GC_FOREGROUND;
1105     uint32_t vals[2] = { colors.bar_bg, colors.bar_bg };
1106     xcb_free_gc(xcb_connection, statusline_clear);
1107     statusline_clear = xcb_generate_id(xcb_connection);
1108     xcb_void_cookie_t clear_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1109                                                                statusline_clear,
1110                                                                xcb_root,
1111                                                                mask,
1112                                                                vals);
1113
1114     mask |= XCB_GC_BACKGROUND;
1115     vals[0] = colors.bar_fg;
1116     statusline_ctx = xcb_generate_id(xcb_connection);
1117     xcb_free_gc(xcb_connection, statusline_ctx);
1118     xcb_void_cookie_t sl_ctx_cookie = xcb_create_gc_checked(xcb_connection,
1119                                                             statusline_ctx,
1120                                                             xcb_root,
1121                                                             mask,
1122                                                             vals);
1123
1124     if (xcb_request_failed(sl_pm_cookie, "Could not allocate statusline-buffer") ||
1125         xcb_request_failed(clear_ctx_cookie, "Could not allocate statusline-buffer-clearcontext") ||
1126         xcb_request_failed(sl_ctx_cookie, "Could not allocate statusline-buffer-context")) {
1127         exit(EXIT_FAILURE);
1128     }
1129
1130 }
1131
1132 /*
1133  * Reconfigure all bars and create new bars for recently activated outputs
1134  *
1135  */
1136 void reconfig_windows() {
1137     uint32_t mask;
1138     uint32_t values[5];
1139     static bool tray_configured = false;
1140
1141     i3_output *walk;
1142     SLIST_FOREACH(walk, outputs, slist) {
1143         if (!walk->active) {
1144             /* If an output is not active, we destroy its bar */
1145             /* FIXME: Maybe we rather want to unmap? */
1146             DLOG("Destroying window for output %s\n", walk->name);
1147             destroy_window(walk);
1148             continue;
1149         }
1150         if (walk->bar == XCB_NONE) {
1151             DLOG("Creating Window for output %s\n", walk->name);
1152
1153             walk->bar = xcb_generate_id(xcb_connection);
1154             walk->buffer = xcb_generate_id(xcb_connection);
1155             mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
1156             /* Black background */
1157             values[0] = colors.bar_bg;
1158             /* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
1159             values[1] = config.hide_on_modifier;
1160             /* We enable the following EventMask fields:
1161              * EXPOSURE, to get expose events (we have to re-draw then)
1162              * SUBSTRUCTURE_REDIRECT, to get ConfigureRequests when the tray
1163              *                        child windows use ConfigureWindow
1164              * BUTTON_PRESS, to handle clicks on the workspace buttons
1165              * */
1166             values[2] = XCB_EVENT_MASK_EXPOSURE |
1167                         XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT;
1168             if (!config.disable_ws) {
1169                 values[2] |= XCB_EVENT_MASK_BUTTON_PRESS;
1170             }
1171             xcb_void_cookie_t win_cookie = xcb_create_window_checked(xcb_connection,
1172                                                                      xcb_screen->root_depth,
1173                                                                      walk->bar,
1174                                                                      xcb_root,
1175                                                                      walk->rect.x, walk->rect.y + walk->rect.h - font.height - 6,
1176                                                                      walk->rect.w, font.height + 6,
1177                                                                      1,
1178                                                                      XCB_WINDOW_CLASS_INPUT_OUTPUT,
1179                                                                      xcb_screen->root_visual,
1180                                                                      mask,
1181                                                                      values);
1182
1183             /* The double-buffer we use to render stuff off-screen */
1184             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1185                                                                     xcb_screen->root_depth,
1186                                                                     walk->buffer,
1187                                                                     walk->bar,
1188                                                                     walk->rect.w,
1189                                                                     walk->rect.h);
1190
1191             /* Set the WM_CLASS and WM_NAME (we don't need UTF-8) atoms */
1192             xcb_void_cookie_t class_cookie;
1193             class_cookie = xcb_change_property(xcb_connection,
1194                                                XCB_PROP_MODE_REPLACE,
1195                                                walk->bar,
1196                                                XCB_ATOM_WM_CLASS,
1197                                                XCB_ATOM_STRING,
1198                                                8,
1199                                                (strlen("i3bar") + 1) * 2,
1200                                                "i3bar\0i3bar\0");
1201
1202             char *name;
1203             if (asprintf(&name, "i3bar for output %s", walk->name) == -1)
1204                 err(EXIT_FAILURE, "asprintf()");
1205             xcb_void_cookie_t name_cookie;
1206             name_cookie = xcb_change_property(xcb_connection,
1207                                               XCB_PROP_MODE_REPLACE,
1208                                               walk->bar,
1209                                               XCB_ATOM_WM_NAME,
1210                                               XCB_ATOM_STRING,
1211                                               8,
1212                                               strlen(name),
1213                                               name);
1214             free(name);
1215
1216             /* We want dock-windows (for now). When override_redirect is set, i3 is ignoring
1217              * this one */
1218             xcb_void_cookie_t dock_cookie = xcb_change_property(xcb_connection,
1219                                                                 XCB_PROP_MODE_REPLACE,
1220                                                                 walk->bar,
1221                                                                 atoms[_NET_WM_WINDOW_TYPE],
1222                                                                 XCB_ATOM_ATOM,
1223                                                                 32,
1224                                                                 1,
1225                                                                 (unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
1226
1227             /* We need to tell i3, where to reserve space for i3bar */
1228             /* left, right, top, bottom, left_start_y, left_end_y,
1229              * right_start_y, right_end_y, top_start_x, top_end_x, bottom_start_x,
1230              * bottom_end_x */
1231             /* A local struct to save the strut_partial property */
1232             struct {
1233                 uint32_t left;
1234                 uint32_t right;
1235                 uint32_t top;
1236                 uint32_t bottom;
1237                 uint32_t left_start_y;
1238                 uint32_t left_end_y;
1239                 uint32_t right_start_y;
1240                 uint32_t right_end_y;
1241                 uint32_t top_start_x;
1242                 uint32_t top_end_x;
1243                 uint32_t bottom_start_x;
1244                 uint32_t bottom_end_x;
1245             } __attribute__((__packed__)) strut_partial = {0,};
1246             switch (config.position) {
1247                 case POS_NONE:
1248                     break;
1249                 case POS_TOP:
1250                     strut_partial.top = font.height + 6;
1251                     strut_partial.top_start_x = walk->rect.x;
1252                     strut_partial.top_end_x = walk->rect.x + walk->rect.w;
1253                     break;
1254                 case POS_BOT:
1255                     strut_partial.bottom = font.height + 6;
1256                     strut_partial.bottom_start_x = walk->rect.x;
1257                     strut_partial.bottom_end_x = walk->rect.x + walk->rect.w;
1258                     break;
1259             }
1260             xcb_void_cookie_t strut_cookie = xcb_change_property(xcb_connection,
1261                                                                  XCB_PROP_MODE_REPLACE,
1262                                                                  walk->bar,
1263                                                                  atoms[_NET_WM_STRUT_PARTIAL],
1264                                                                  XCB_ATOM_CARDINAL,
1265                                                                  32,
1266                                                                  12,
1267                                                                  &strut_partial);
1268
1269             /* We also want a graphics-context for the bars (it defines the properties
1270              * with which we draw to them) */
1271             walk->bargc = xcb_generate_id(xcb_connection);
1272             xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection,
1273                                                                 walk->bargc,
1274                                                                 walk->bar,
1275                                                                 0,
1276                                                                 NULL);
1277
1278             /* We finally map the bar (display it on screen), unless the modifier-switch is on */
1279             xcb_void_cookie_t map_cookie;
1280             if (!config.hide_on_modifier) {
1281                 map_cookie = xcb_map_window_checked(xcb_connection, walk->bar);
1282             }
1283
1284             if (xcb_request_failed(win_cookie,   "Could not create window") ||
1285                 xcb_request_failed(pm_cookie,    "Could not create pixmap") ||
1286                 xcb_request_failed(dock_cookie,  "Could not set dock mode") ||
1287                 xcb_request_failed(class_cookie, "Could not set WM_CLASS")  ||
1288                 xcb_request_failed(name_cookie,  "Could not set WM_NAME")   ||
1289                 xcb_request_failed(strut_cookie, "Could not set strut")     ||
1290                 xcb_request_failed(gc_cookie,    "Could not create graphical context") ||
1291                 (!config.hide_on_modifier && xcb_request_failed(map_cookie, "Could not map window"))) {
1292                 exit(EXIT_FAILURE);
1293             }
1294
1295             if (!tray_configured &&
1296                 (!config.tray_output ||
1297                  strcasecmp("none", config.tray_output) != 0)) {
1298                 init_tray();
1299                 tray_configured = true;
1300             }
1301         } else {
1302             /* We already have a bar, so we just reconfigure it */
1303             mask = XCB_CONFIG_WINDOW_X |
1304                    XCB_CONFIG_WINDOW_Y |
1305                    XCB_CONFIG_WINDOW_WIDTH |
1306                    XCB_CONFIG_WINDOW_HEIGHT |
1307                    XCB_CONFIG_WINDOW_STACK_MODE;
1308             values[0] = walk->rect.x;
1309             values[1] = walk->rect.y + walk->rect.h - font.height - 6;
1310             values[2] = walk->rect.w;
1311             values[3] = font.height + 6;
1312             values[4] = XCB_STACK_MODE_ABOVE;
1313
1314             DLOG("Destroying buffer for output %s", walk->name);
1315             xcb_free_pixmap(xcb_connection, walk->buffer);
1316
1317             DLOG("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
1318             xcb_void_cookie_t cfg_cookie = xcb_configure_window_checked(xcb_connection,
1319                                                                         walk->bar,
1320                                                                         mask,
1321                                                                         values);
1322
1323             DLOG("Recreating buffer for output %s", walk->name);
1324             xcb_void_cookie_t pm_cookie = xcb_create_pixmap_checked(xcb_connection,
1325                                                                     xcb_screen->root_depth,
1326                                                                     walk->buffer,
1327                                                                     walk->bar,
1328                                                                     walk->rect.w,
1329                                                                     walk->rect.h);
1330
1331             if (xcb_request_failed(cfg_cookie, "Could not reconfigure window")) {
1332                 exit(EXIT_FAILURE);
1333             }
1334             if (xcb_request_failed(pm_cookie,  "Could not create pixmap")) {
1335                 exit(EXIT_FAILURE);
1336             }
1337         }
1338     }
1339 }
1340
1341 /*
1342  * Render the bars, with buttons and statusline
1343  *
1344  */
1345 void draw_bars() {
1346     DLOG("Drawing Bars...\n");
1347     int i = 0;
1348
1349     refresh_statusline();
1350
1351     i3_output *outputs_walk;
1352     SLIST_FOREACH(outputs_walk, outputs, slist) {
1353         if (!outputs_walk->active) {
1354             DLOG("Output %s inactive, skipping...\n", outputs_walk->name);
1355             continue;
1356         }
1357         if (outputs_walk->bar == XCB_NONE) {
1358             /* Oh shit, an active output without an own bar. Create it now! */
1359             reconfig_windows();
1360         }
1361         /* First things first: clear the backbuffer */
1362         uint32_t color = colors.bar_bg;
1363         xcb_change_gc(xcb_connection,
1364                       outputs_walk->bargc,
1365                       XCB_GC_FOREGROUND,
1366                       &color);
1367         xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font.height + 6 };
1368         xcb_poly_fill_rectangle(xcb_connection,
1369                                 outputs_walk->buffer,
1370                                 outputs_walk->bargc,
1371                                 1,
1372                                 &rect);
1373
1374         if (statusline != NULL) {
1375             DLOG("Printing statusline!\n");
1376
1377             /* Luckily we already prepared a seperate pixmap containing the rendered
1378              * statusline, we just have to copy the relevant parts to the relevant
1379              * position */
1380             trayclient *trayclient;
1381             int traypx = 0;
1382             TAILQ_FOREACH(trayclient, outputs_walk->trayclients, tailq) {
1383                 if (!trayclient->mapped)
1384                     continue;
1385                 /* We assume the tray icons are quadratic (we use the font
1386                  * *height* as *width* of the icons) because we configured them
1387                  * like this. */
1388                 traypx += font.height + 2;
1389             }
1390             /* Add 2px of padding if there are any tray icons */
1391             if (traypx > 0)
1392                 traypx += 2;
1393             xcb_copy_area(xcb_connection,
1394                           statusline_pm,
1395                           outputs_walk->buffer,
1396                           outputs_walk->bargc,
1397                           MAX(0, (int16_t)(statusline_width - outputs_walk->rect.w + 4)), 0,
1398                           MAX(0, (int16_t)(outputs_walk->rect.w - statusline_width - traypx - 4)), 3,
1399                           MIN(outputs_walk->rect.w - traypx - 4, statusline_width), font.height);
1400         }
1401
1402         if (config.disable_ws) {
1403             continue;
1404         }
1405
1406         i3_ws *ws_walk;
1407         TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
1408             DLOG("Drawing Button for WS %s at x = %d, len = %d\n", ws_walk->name, i, ws_walk->name_width);
1409             uint32_t fg_color = colors.inactive_ws_fg;
1410             uint32_t bg_color = colors.inactive_ws_bg;
1411             uint32_t border_color = colors.inactive_ws_border;
1412             if (ws_walk->visible) {
1413                 if (!ws_walk->focused) {
1414                     fg_color = colors.active_ws_fg;
1415                     bg_color = colors.active_ws_bg;
1416                     border_color = colors.active_ws_border;
1417                 } else {
1418                     fg_color = colors.focus_ws_fg;
1419                     bg_color = colors.focus_ws_bg;
1420                     border_color = colors.focus_ws_border;
1421                 }
1422             }
1423             if (ws_walk->urgent) {
1424                 DLOG("WS %s is urgent!\n", ws_walk->name);
1425                 fg_color = colors.urgent_ws_fg;
1426                 bg_color = colors.urgent_ws_bg;
1427                 border_color = colors.urgent_ws_border;
1428                 /* The urgent-hint should get noticed, so we unhide the bars shortly */
1429                 unhide_bars();
1430             }
1431             uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
1432             uint32_t vals_border[] = { border_color, border_color };
1433             xcb_change_gc(xcb_connection,
1434                           outputs_walk->bargc,
1435                           mask,
1436                           vals_border);
1437             xcb_rectangle_t rect_border = { i, 0, ws_walk->name_width + 10, font.height + 4 };
1438             xcb_poly_fill_rectangle(xcb_connection,
1439                                     outputs_walk->buffer,
1440                                     outputs_walk->bargc,
1441                                     1,
1442                                     &rect_border);
1443             uint32_t vals[] = { bg_color, bg_color };
1444             xcb_change_gc(xcb_connection,
1445                           outputs_walk->bargc,
1446                           mask,
1447                           vals);
1448             xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font.height + 2 };
1449             xcb_poly_fill_rectangle(xcb_connection,
1450                                     outputs_walk->buffer,
1451                                     outputs_walk->bargc,
1452                                     1,
1453                                     &rect);
1454             set_font_colors(outputs_walk->bargc, fg_color, bg_color);
1455             draw_text((char*)ws_walk->ucs2_name, ws_walk->name_glyphs, true,
1456                     outputs_walk->buffer, outputs_walk->bargc, i + 5, 2, ws_walk->name_width);
1457             i += 10 + ws_walk->name_width + 1;
1458         }
1459
1460         i = 0;
1461     }
1462
1463     redraw_bars();
1464 }
1465
1466 /*
1467  * Redraw the bars, i.e. simply copy the buffer to the barwindow
1468  *
1469  */
1470 void redraw_bars() {
1471     i3_output *outputs_walk;
1472     SLIST_FOREACH(outputs_walk, outputs, slist) {
1473         if (!outputs_walk->active) {
1474             continue;
1475         }
1476         xcb_copy_area(xcb_connection,
1477                       outputs_walk->buffer,
1478                       outputs_walk->bar,
1479                       outputs_walk->bargc,
1480                       0, 0,
1481                       0, 0,
1482                       outputs_walk->rect.w,
1483                       outputs_walk->rect.h);
1484         xcb_flush(xcb_connection);
1485     }
1486 }