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