git.sur5r.net Git - i3/i3/blob - src/xinerama.c

   1 /*
   2  * vim:ts=8:expandtab
   3  *
   4  * i3 - an improved dynamic tiling window manager
   5  *
   6  * © 2009 Michael Stapelberg and contributors
   7  *
   8  * See file LICENSE for license information.
   9  *
  10  */
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <stdbool.h>
  15 #include <assert.h>
  16 #include <time.h>
  17 #include <unistd.h>
  18
  19 #include <xcb/xcb.h>
  20 #include <xcb/xinerama.h>
  21
  22 #include "queue.h"
  23 #include "i3.h"
  24 #include "data.h"
  25 #include "table.h"
  26 #include "util.h"
  27 #include "xinerama.h"
  28 #include "layout.h"
  29 #include "xcb.h"
  30 #include "config.h"
  31 #include "workspace.h"
  32 #include "log.h"
  33
  34 /* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
  35  * (xrandr --same-as) */
  36 struct screens_head *virtual_screens;
  37
  38 static bool xinerama_enabled = true;
  39
  40 /*
  41  * Returns true if both screen objects describe the same screen (checks their
  42  * size and position).
  43  *
  44  */
  45 bool screens_are_equal(i3Screen *screen1, i3Screen *screen2) {
  46         /* If one of both objects (or both) are NULL, we cannot compare them */
  47         if (screen1 == NULL || screen2 == NULL)
  48                 return false;
  49
  50         /* If the pointers are equal, take the short-circuit */
  51         if (screen1 == screen2)
  52                 return true;
  53
  54         /* Compare their size - other properties are not relevant to determine
  55          * if a screen is equal to another one */
  56         return (memcmp(&(screen1->rect), &(screen2->rect), sizeof(Rect)) == 0);
  57 }
  58
  59 /*
  60  * Looks in virtual_screens for the i3Screen whose start coordinates are x, y
  61  *
  62  */
  63 i3Screen *get_screen_at(int x, int y, struct screens_head *screenlist) {
  64         i3Screen *screen;
  65         TAILQ_FOREACH(screen, screenlist, screens)
  66                 if (screen->rect.x == x && screen->rect.y == y)
  67                         return screen;
  68
  69         return NULL;
  70 }
  71
  72 /*
  73  * Looks in virtual_screens for the i3Screen which contains coordinates x, y
  74  *
  75  */
  76 i3Screen *get_screen_containing(int x, int y) {
  77         i3Screen *screen;
  78         TAILQ_FOREACH(screen, virtual_screens, screens) {
  79                 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
  80                                 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
  81                 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
  82                     y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
  83                         return screen;
  84         }
  85
  86         return NULL;
  87 }
  88
  89 /*
  90  * Gets the screen which is the last one in the given direction, for example the screen
  91  * on the most bottom when direction == D_DOWN, the screen most right when direction == D_RIGHT
  92  * and so on.
  93  *
  94  * This function always returns a screen.
  95  *
  96  */
  97 i3Screen *get_screen_most(direction_t direction, i3Screen *current) {
  98         i3Screen *screen, *candidate = NULL;
  99         int position = 0;
 100         TAILQ_FOREACH(screen, virtual_screens, screens) {
 101                 /* Repeated calls of WIN determine the winner of the comparison */
 102                 #define WIN(variable, condition) \
 103                         if (variable condition) { \
 104                                 candidate = screen; \
 105                                 position = variable; \
 106                         } \
 107                         break;
 108
 109                 if (((direction == D_UP) || (direction == D_DOWN)) &&
 110                     (current->rect.x != screen->rect.x))
 111                         continue;
 112
 113                 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
 114                     (current->rect.y != screen->rect.y))
 115                         continue;
 116
 117                 switch (direction) {
 118                         case D_UP:
 119                                 WIN(screen->rect.y, <= position);
 120                         case D_DOWN:
 121                                 WIN(screen->rect.y, >= position);
 122                         case D_LEFT:
 123                                 WIN(screen->rect.x, <= position);
 124                         case D_RIGHT:
 125                                 WIN(screen->rect.x, >= position);
 126                 }
 127         }
 128
 129         assert(candidate != NULL);
 130
 131         return candidate;
 132 }
 133
 134 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
 135         i3Font *font = load_font(conn, config.font);
 136
 137         workspace->screen = screen;
 138         screen->current_workspace = workspace;
 139
 140         /* Create a bar for each screen */
 141         Rect bar_rect = {screen->rect.x,
 142                          screen->rect.y + screen->rect.height - (font->height + 6),
 143                          screen->rect.x + screen->rect.width,
 144                          font->height + 6};
 145         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 146         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 147         screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
 148         screen->bargc = xcb_generate_id(conn);
 149         xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
 150
 151         SLIST_INIT(&(screen->dock_clients));
 152
 153         DLOG("that is virtual screen at %d x %d with %d x %d\n",
 154                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 155 }
 156
 157 /*
 158  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
 159  *
 160  */
 161 static void disable_xinerama(xcb_connection_t *conn) {
 162         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 163
 164         i3Screen *s = calloc(sizeof(i3Screen), 1);
 165
 166         s->rect.x = 0;
 167         s->rect.y = 0;
 168         s->rect.width = root_screen->width_in_pixels;
 169         s->rect.height = root_screen->height_in_pixels;
 170
 171         num_screens = 1;
 172         s->num = 0;
 173
 174         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
 175
 176         xinerama_enabled = false;
 177 }
 178
 179 /*
 180  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
 181  * Xinerama screen which are configured in clone mode) in the given screenlist
 182  *
 183  */
 184 static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
 185         xcb_xinerama_query_screens_reply_t *reply;
 186         xcb_xinerama_screen_info_t *screen_info;
 187         time_t before_trying = time(NULL);
 188
 189         /* Try repeatedly to find screens (there might be short timeframes in
 190          * which the X server does not return any screens, such as when rotating
 191          * screens), but not longer than 5 seconds (strictly speaking, only four
 192          * seconds of trying are guaranteed due to the 1-second-resolution) */
 193         while ((time(NULL) - before_trying) < 10) {
 194                 reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
 195                 if (!reply) {
 196                         ELOG("Couldn't get Xinerama screens\n");
 197                         return;
 198                 }
 199                 screen_info = xcb_xinerama_query_screens_screen_info(reply);
 200                 int screens = xcb_xinerama_query_screens_screen_info_length(reply);
 201                 num_screens = 0;
 202
 203                 for (int screen = 0; screen < screens; screen++) {
 204                         i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
 205                         if (s != NULL) {
 206                                 /* This screen already exists. We use the littlest screen so that the user
 207                                    can always see the complete workspace */
 208                                 s->rect.width = min(s->rect.width, screen_info[screen].width);
 209                                 s->rect.height = min(s->rect.height, screen_info[screen].height);
 210                         } else {
 211                                 s = calloc(sizeof(i3Screen), 1);
 212                                 s->rect.x = screen_info[screen].x_org;
 213                                 s->rect.y = screen_info[screen].y_org;
 214                                 s->rect.width = screen_info[screen].width;
 215                                 s->rect.height = screen_info[screen].height;
 216                                 /* We always treat the screen at 0x0 as the primary screen */
 217                                 if (s->rect.x == 0 && s->rect.y == 0)
 218                                         TAILQ_INSERT_HEAD(screenlist, s, screens);
 219                                 else TAILQ_INSERT_TAIL(screenlist, s, screens);
 220                                 num_screens++;
 221                         }
 222
 223                         DLOG("found Xinerama screen: %d x %d at %d x %d\n",
 224                                         screen_info[screen].width, screen_info[screen].height,
 225                                         screen_info[screen].x_org, screen_info[screen].y_org);
 226                 }
 227
 228                 free(reply);
 229
 230                 if (num_screens == 0) {
 231                         ELOG("No screens found. This is weird. Trying again...\n");
 232                         /* Give the scheduler a chance to do something else
 233                          * and don’t hog the CPU */
 234                         usleep(250);
 235                         continue;
 236                 }
 237
 238                 break;
 239         }
 240
 241         if (num_screens == 0) {
 242                 ELOG("No screens found for 10 seconds. Please fix your setup. i3 will exit now.\n");
 243                 exit(0);
 244         }
 245 }
 246
 247 /*
 248  * We have just established a connection to the X server and need the initial Xinerama
 249  * information to setup workspaces for each screen.
 250  *
 251  */
 252 void initialize_xinerama(xcb_connection_t *conn) {
 253         virtual_screens = scalloc(sizeof(struct screens_head));
 254         TAILQ_INIT(virtual_screens);
 255
 256         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 257                 DLOG("Xinerama extension not found, disabling.\n");
 258                 disable_xinerama(conn);
 259         } else {
 260                 xcb_xinerama_is_active_reply_t *reply;
 261                 reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 262
 263                 if (reply == NULL || !reply->state) {
 264                         DLOG("Xinerama is not active (in your X-Server), disabling.\n");
 265                         disable_xinerama(conn);
 266                 } else
 267                         query_screens(conn, virtual_screens);
 268
 269                 FREE(reply);
 270         }
 271
 272         i3Screen *screen;
 273         num_screens = 0;
 274         /* Just go through each workspace and associate as many screens as we can. */
 275         TAILQ_FOREACH(screen, virtual_screens, screens) {
 276                 screen->num = num_screens;
 277                 num_screens++;
 278                 Workspace *ws = get_first_workspace_for_screen(virtual_screens, screen);
 279                 initialize_screen(conn, screen, ws);
 280         }
 281 }
 282
 283 /*
 284  * This is called when the rootwindow receives a configure_notify event and therefore the
 285  * number/position of the Xinerama screens could have changed.
 286  *
 287  */
 288 void xinerama_requery_screens(xcb_connection_t *conn) {
 289         i3Font *font = load_font(conn, config.font);
 290
 291         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 292            it change when I move the --right-of video projector to --left-of? */
 293
 294         if (!xinerama_enabled) {
 295                 DLOG("Xinerama is disabled\n");
 296                 return;
 297         }
 298
 299         /* We use a separate copy to diff with the previous set of screens */
 300         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 301         TAILQ_INIT(new_screens);
 302
 303         query_screens(conn, new_screens);
 304
 305         i3Screen *first = TAILQ_FIRST(new_screens),
 306                  *screen,
 307                  *old_screen;
 308         int screen_count = 0;
 309         /* Mark each workspace which currently is assigned to a screen, so we
 310          * can garbage-collect afterwards */
 311         Workspace *ws;
 312         TAILQ_FOREACH(ws, workspaces, workspaces)
 313                 ws->reassigned = (ws->screen == NULL);
 314
 315         TAILQ_FOREACH(screen, new_screens, screens) {
 316                 screen->num = screen_count;
 317                 screen->current_workspace = NULL;
 318
 319                 TAILQ_FOREACH(old_screen, virtual_screens, screens) {
 320                         if (old_screen->num != screen_count)
 321                                 continue;
 322
 323                         DLOG("Found a matching screen\n");
 324                         /* Use the same workspace */
 325                         screen->current_workspace = old_screen->current_workspace;
 326
 327                         /* Re-use the old bar window */
 328                         screen->bar = old_screen->bar;
 329                         screen->bargc = old_screen->bargc;
 330                         DLOG("old_screen->bar = %p\n", old_screen->bar);
 331
 332                         Rect bar_rect = {screen->rect.x,
 333                                          screen->rect.y + screen->rect.height - (font->height + 6),
 334                                          screen->rect.x + screen->rect.width,
 335                                          font->height + 6};
 336
 337                         DLOG("configuring bar to be at %d x %d with %d x %d\n",
 338                                         bar_rect.x, bar_rect.y, bar_rect.height, bar_rect.width);
 339                         xcb_configure_window(conn, screen->bar, XCB_CONFIG_WINDOW_X |
 340                                                                 XCB_CONFIG_WINDOW_Y |
 341                                                                 XCB_CONFIG_WINDOW_WIDTH |
 342                                                                 XCB_CONFIG_WINDOW_HEIGHT, &(bar_rect.x));
 343
 344                         /* Copy the list head for the dock clients */
 345                         screen->dock_clients = old_screen->dock_clients;
 346                         SLIST_INIT(&(old_screen->dock_clients));
 347
 348                         /* Update the dimensions */
 349                         Workspace *ws;
 350                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 351                                 if (ws->screen != old_screen)
 352                                         continue;
 353
 354                                 DLOG("re-assigning ws %d\n", ws->num);
 355                                 memcpy(&(ws->rect), &(screen->rect), sizeof(Rect));
 356                                 ws->screen = screen;
 357                                 ws->reassigned = true;
 358                         }
 359
 360                         break;
 361                 }
 362                 if (screen->current_workspace == NULL) {
 363                         /* Find the first unused workspace, preferring the ones
 364                          * which are assigned to this screen and initialize
 365                          * the screen with it. */
 366                         DLOG("getting first ws for screen %p\n", screen);
 367                         Workspace *ws = get_first_workspace_for_screen(new_screens, screen);
 368                         initialize_screen(conn, screen, ws);
 369                         ws->reassigned = true;
 370
 371                         /* As this workspace just got visible (we got a new screen
 372                          * without workspace), we need to map its clients */
 373                         workspace_map_clients(conn, ws);
 374                 }
 375                 screen_count++;
 376         }
 377
 378         /* check for dock_clients which are out of bounds */
 379         TAILQ_FOREACH(old_screen, virtual_screens, screens) {
 380                 if (SLIST_EMPTY(&(old_screen->dock_clients)))
 381                         continue;
 382
 383                 DLOG("dock_clients out of bounds at screen %p, reassigning\n", old_screen);
 384                 if (SLIST_EMPTY(&(first->dock_clients))) {
 385                         first->dock_clients = old_screen->dock_clients;
 386                         continue;
 387                 }
 388
 389                 /* We need to merge the lists */
 390                 Client *dock_client;
 391
 392                 while (!SLIST_EMPTY(&(old_screen->dock_clients))) {
 393                         dock_client = SLIST_FIRST(&(old_screen->dock_clients));
 394                         SLIST_INSERT_HEAD(&(first->dock_clients), dock_client, dock_clients);
 395                         SLIST_REMOVE_HEAD(&(old_screen->dock_clients), dock_clients);
 396                 }
 397         }
 398
 399         /* Check for workspaces which are out of bounds */
 400         TAILQ_FOREACH(ws, workspaces, workspaces) {
 401                 if (ws->reassigned)
 402                         continue;
 403
 404                 Client *client;
 405
 406                 DLOG("Closing bar window (%p)\n", ws->screen->bar);
 407                 xcb_destroy_window(conn, ws->screen->bar);
 408
 409                 DLOG("Workspace %d's screen out of bounds, assigning to first screen\n", ws->num + 1);
 410                 ws->screen = first;
 411                 memcpy(&(ws->rect), &(first->rect), sizeof(Rect));
 412
 413                 /* Force reconfiguration for each client on that workspace */
 414                 FOR_TABLE(ws)
 415                         CIRCLEQ_FOREACH(client, &(ws->table[cols][rows]->clients), clients)
 416                                 client->force_reconfigure = true;
 417
 418                 /* Render the workspace to reconfigure the clients. However, they will be visible now, so… */
 419                 render_workspace(conn, first, ws);
 420
 421                 /* …unless we want to see them at the moment, we should hide that workspace */
 422                 if (workspace_is_visible(ws))
 423                         continue;
 424
 425                 workspace_unmap_clients(conn, ws);
 426
 427                 if (c_ws == ws) {
 428                         DLOG("Need to adjust c_ws...\n");
 429                         c_ws = first->current_workspace;
 430                 }
 431         }
 432         xcb_flush(conn);
 433
 434         /* Free the old list */
 435         while (!TAILQ_EMPTY(virtual_screens)) {
 436                 screen = TAILQ_FIRST(virtual_screens);
 437                 TAILQ_REMOVE(virtual_screens, screen, screens);
 438                 free(screen);
 439         }
 440         free(virtual_screens);
 441
 442         virtual_screens = new_screens;
 443
 444         DLOG("Current workspace is now: %d\n", first->current_workspace);
 445
 446         render_layout(conn);
 447 }