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 and position - other properties are not relevant
  55          * to determine 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                                 DLOG("Re-used old Xinerama screen %p\n", s);
 207                                 /* This screen already exists. We use the littlest screen so that the user
 208                                    can always see the complete workspace */
 209                                 s->rect.width = min(s->rect.width, screen_info[screen].width);
 210                                 s->rect.height = min(s->rect.height, screen_info[screen].height);
 211                         } else {
 212                                 s = calloc(sizeof(i3Screen), 1);
 213                                 DLOG("Created new Xinerama screen %p\n", s);
 214                                 s->rect.x = screen_info[screen].x_org;
 215                                 s->rect.y = screen_info[screen].y_org;
 216                                 s->rect.width = screen_info[screen].width;
 217                                 s->rect.height = screen_info[screen].height;
 218                                 /* We always treat the screen at 0x0 as the primary screen */
 219                                 if (s->rect.x == 0 && s->rect.y == 0)
 220                                         TAILQ_INSERT_HEAD(screenlist, s, screens);
 221                                 else TAILQ_INSERT_TAIL(screenlist, s, screens);
 222                                 num_screens++;
 223                         }
 224
 225                         DLOG("found Xinerama screen: %d x %d at %d x %d\n",
 226                                         screen_info[screen].width, screen_info[screen].height,
 227                                         screen_info[screen].x_org, screen_info[screen].y_org);
 228                 }
 229
 230                 free(reply);
 231
 232                 if (num_screens == 0) {
 233                         ELOG("No screens found. This is weird. Trying again...\n");
 234                         /* Give the scheduler a chance to do something else
 235                          * and don’t hog the CPU */
 236                         usleep(250);
 237                         continue;
 238                 }
 239
 240                 break;
 241         }
 242
 243         if (num_screens == 0) {
 244                 ELOG("No screens found for 10 seconds. Please fix your setup. i3 will exit now.\n");
 245                 exit(0);
 246         }
 247 }
 248
 249 /*
 250  * We have just established a connection to the X server and need the initial Xinerama
 251  * information to setup workspaces for each screen.
 252  *
 253  */
 254 void initialize_xinerama(xcb_connection_t *conn) {
 255         virtual_screens = scalloc(sizeof(struct screens_head));
 256         TAILQ_INIT(virtual_screens);
 257
 258         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 259                 DLOG("Xinerama extension not found, disabling.\n");
 260                 disable_xinerama(conn);
 261         } else {
 262                 xcb_xinerama_is_active_reply_t *reply;
 263                 reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 264
 265                 if (reply == NULL || !reply->state) {
 266                         DLOG("Xinerama is not active (in your X-Server), disabling.\n");
 267                         disable_xinerama(conn);
 268                 } else
 269                         query_screens(conn, virtual_screens);
 270
 271                 FREE(reply);
 272         }
 273
 274         i3Screen *screen;
 275         num_screens = 0;
 276         /* Just go through each workspace and associate as many screens as we can. */
 277         TAILQ_FOREACH(screen, virtual_screens, screens) {
 278                 screen->num = num_screens;
 279                 num_screens++;
 280                 Workspace *ws = get_first_workspace_for_screen(virtual_screens, screen);
 281                 initialize_screen(conn, screen, ws);
 282         }
 283 }
 284
 285 /*
 286  * This is called when the rootwindow receives a configure_notify event and therefore the
 287  * number/position of the Xinerama screens could have changed.
 288  *
 289  */
 290 void xinerama_requery_screens(xcb_connection_t *conn) {
 291         i3Font *font = load_font(conn, config.font);
 292
 293         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 294            it change when I move the --right-of video projector to --left-of? */
 295
 296         if (!xinerama_enabled) {
 297                 DLOG("Xinerama is disabled\n");
 298                 return;
 299         }
 300
 301         /* We use a separate copy to diff with the previous set of screens */
 302         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 303         TAILQ_INIT(new_screens);
 304
 305         query_screens(conn, new_screens);
 306
 307         i3Screen *first = TAILQ_FIRST(new_screens),
 308                  *screen,
 309                  *old_screen;
 310         int screen_count = 0;
 311         /* Mark each workspace which currently is assigned to a screen, so we
 312          * can garbage-collect afterwards */
 313         Workspace *ws;
 314         TAILQ_FOREACH(ws, workspaces, workspaces)
 315                 ws->reassigned = (ws->screen == NULL);
 316
 317         TAILQ_FOREACH(screen, new_screens, screens) {
 318                 screen->num = screen_count;
 319                 screen->current_workspace = NULL;
 320
 321                 TAILQ_FOREACH(old_screen, virtual_screens, screens) {
 322                         if (old_screen->num != screen_count)
 323                                 continue;
 324
 325                         DLOG("Found a matching screen\n");
 326                         /* Use the same workspace */
 327                         screen->current_workspace = old_screen->current_workspace;
 328
 329                         /* Re-use the old bar window */
 330                         screen->bar = old_screen->bar;
 331                         screen->bargc = old_screen->bargc;
 332                         DLOG("old_screen->bar = %p\n", old_screen->bar);
 333
 334                         Rect bar_rect = {screen->rect.x,
 335                                          screen->rect.y + screen->rect.height - (font->height + 6),
 336                                          screen->rect.width,
 337                                          font->height + 6};
 338
 339                         DLOG("configuring bar to be at %d x %d with %d x %d\n",
 340                                         bar_rect.x, bar_rect.y, bar_rect.height, bar_rect.width);
 341                         xcb_configure_window(conn, screen->bar, XCB_CONFIG_WINDOW_X |
 342                                                                 XCB_CONFIG_WINDOW_Y |
 343                                                                 XCB_CONFIG_WINDOW_WIDTH |
 344                                                                 XCB_CONFIG_WINDOW_HEIGHT, &(bar_rect.x));
 345
 346                         /* Copy the list head for the dock clients */
 347                         screen->dock_clients = old_screen->dock_clients;
 348                         SLIST_INIT(&(old_screen->dock_clients));
 349
 350                         /* Update the dimensions */
 351                         Workspace *ws;
 352                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 353                                 if (ws->screen != old_screen)
 354                                         continue;
 355
 356                                 DLOG("re-assigning ws %d\n", ws->num);
 357                                 memcpy(&(ws->rect), &(screen->rect), sizeof(Rect));
 358                                 ws->screen = screen;
 359                                 ws->reassigned = true;
 360                         }
 361
 362                         break;
 363                 }
 364                 if (screen->current_workspace == NULL) {
 365                         /* Find the first unused workspace, preferring the ones
 366                          * which are assigned to this screen and initialize
 367                          * the screen with it. */
 368                         DLOG("getting first ws for screen %p\n", screen);
 369                         Workspace *ws = get_first_workspace_for_screen(new_screens, screen);
 370                         initialize_screen(conn, screen, ws);
 371                         ws->reassigned = true;
 372
 373                         /* As this workspace just got visible (we got a new screen
 374                          * without workspace), we need to map its clients */
 375                         workspace_map_clients(conn, ws);
 376                 }
 377                 screen_count++;
 378         }
 379
 380         /* check for dock_clients which are out of bounds */
 381         TAILQ_FOREACH(old_screen, virtual_screens, screens) {
 382                 if (SLIST_EMPTY(&(old_screen->dock_clients)))
 383                         continue;
 384
 385                 DLOG("dock_clients out of bounds at screen %p, reassigning\n", old_screen);
 386                 if (SLIST_EMPTY(&(first->dock_clients))) {
 387                         first->dock_clients = old_screen->dock_clients;
 388                         continue;
 389                 }
 390
 391                 /* We need to merge the lists */
 392                 Client *dock_client;
 393
 394                 while (!SLIST_EMPTY(&(old_screen->dock_clients))) {
 395                         dock_client = SLIST_FIRST(&(old_screen->dock_clients));
 396                         SLIST_INSERT_HEAD(&(first->dock_clients), dock_client, dock_clients);
 397                         SLIST_REMOVE_HEAD(&(old_screen->dock_clients), dock_clients);
 398                 }
 399         }
 400
 401         /* Check for workspaces which are out of bounds */
 402         TAILQ_FOREACH(ws, workspaces, workspaces) {
 403                 if (ws->reassigned)
 404                         continue;
 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                 workspace_assign_to(ws, first);
 411         }
 412
 413         xcb_flush(conn);
 414
 415         /* Free the old list */
 416         while (!TAILQ_EMPTY(virtual_screens)) {
 417                 screen = TAILQ_FIRST(virtual_screens);
 418                 TAILQ_REMOVE(virtual_screens, screen, screens);
 419                 free(screen);
 420         }
 421         free(virtual_screens);
 422
 423         virtual_screens = new_screens;
 424
 425         /* Check for workspaces which need to be assigned to specific screens
 426          * which may now be available */
 427         TAILQ_FOREACH(ws, workspaces, workspaces) {
 428                 if (ws->preferred_screen == NULL || ws->screen == NULL)
 429                         continue;
 430
 431                 workspace_initialize(ws, ws->screen, true);
 432         }
 433
 434         DLOG("Current workspace is now: %d\n", first->current_workspace);
 435
 436         render_layout(conn);
 437 }