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