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) {
  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                 switch (direction) {
 108                         case D_UP:
 109                                 WIN(screen->rect.y, <= position);
 110                         case D_DOWN:
 111                                 WIN(screen->rect.y, >= position);
 112                         case D_LEFT:
 113                                 WIN(screen->rect.x, <= position);
 114                         case D_RIGHT:
 115                                 WIN(screen->rect.x, >= position);
 116                 }
 117         }
 118
 119         assert(candidate != NULL);
 120
 121         return candidate;
 122 }
 123
 124 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
 125         i3Font *font = load_font(conn, config.font);
 126
 127         workspace->screen = screen;
 128         screen->current_workspace = workspace->num;
 129
 130         /* Create a bar for each screen */
 131         Rect bar_rect = {screen->rect.x,
 132                          screen->rect.height - (font->height + 6),
 133                          screen->rect.x + screen->rect.width,
 134                          font->height + 6};
 135         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 136         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 137         screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
 138         screen->bargc = xcb_generate_id(conn);
 139         xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
 140
 141         SLIST_INIT(&(screen->dock_clients));
 142
 143         LOG("that is virtual screen at %d x %d with %d x %d\n",
 144                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 145 }
 146
 147 /*
 148  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
 149  *
 150  */
 151 static void disable_xinerama(xcb_connection_t *conn) {
 152         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 153
 154         i3Screen *s = calloc(sizeof(i3Screen), 1);
 155
 156         s->rect.x = 0;
 157         s->rect.y = 0;
 158         s->rect.width = root_screen->width_in_pixels;
 159         s->rect.height = root_screen->height_in_pixels;
 160
 161         num_screens = 1;
 162         s->num = 0;
 163
 164         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
 165
 166         xinerama_enabled = false;
 167 }
 168
 169 /*
 170  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
 171  * Xinerama screen which are configured in clone mode) in the given screenlist
 172  *
 173  */
 174 static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
 175         xcb_xinerama_query_screens_reply_t *reply;
 176         xcb_xinerama_screen_info_t *screen_info;
 177         time_t before_trying = time(NULL);
 178
 179         /* Try repeatedly to find screens (there might be short timeframes in
 180          * which the X server does not return any screens, such as when rotating
 181          * screens), but not longer than 5 seconds (strictly speaking, only four
 182          * seconds of trying are guaranteed due to the 1-second-resolution) */
 183         while ((time(NULL) - before_trying) < 5) {
 184                 reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
 185                 if (!reply) {
 186                         LOG("Couldn't get Xinerama screens\n");
 187                         return;
 188                 }
 189                 screen_info = xcb_xinerama_query_screens_screen_info(reply);
 190                 int screens = xcb_xinerama_query_screens_screen_info_length(reply);
 191                 num_screens = 0;
 192
 193                 for (int screen = 0; screen < screens; screen++) {
 194                         i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
 195                         if (s != NULL) {
 196                                 /* This screen already exists. We use the littlest screen so that the user
 197                                    can always see the complete workspace */
 198                                 s->rect.width = min(s->rect.width, screen_info[screen].width);
 199                                 s->rect.height = min(s->rect.height, screen_info[screen].height);
 200                         } else {
 201                                 s = calloc(sizeof(i3Screen), 1);
 202                                 s->rect.x = screen_info[screen].x_org;
 203                                 s->rect.y = screen_info[screen].y_org;
 204                                 s->rect.width = screen_info[screen].width;
 205                                 s->rect.height = screen_info[screen].height;
 206                                 /* We always treat the screen at 0x0 as the primary screen */
 207                                 if (s->rect.x == 0 && s->rect.y == 0)
 208                                         TAILQ_INSERT_HEAD(screenlist, s, screens);
 209                                 else TAILQ_INSERT_TAIL(screenlist, s, screens);
 210                                 num_screens++;
 211                         }
 212
 213                         LOG("found Xinerama screen: %d x %d at %d x %d\n",
 214                                         screen_info[screen].width, screen_info[screen].height,
 215                                         screen_info[screen].x_org, screen_info[screen].y_org);
 216                 }
 217
 218                 free(reply);
 219
 220                 if (num_screens == 0) {
 221                         LOG("No screens found. This is weird. Trying again...\n");
 222                         continue;
 223                 }
 224
 225                 break;
 226         }
 227 }
 228
 229 /*
 230  * We have just established a connection to the X server and need the initial Xinerama
 231  * information to setup workspaces for each screen.
 232  *
 233  */
 234 void initialize_xinerama(xcb_connection_t *conn) {
 235         virtual_screens = scalloc(sizeof(struct screens_head));
 236         TAILQ_INIT(virtual_screens);
 237
 238         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 239                 LOG("Xinerama extension not found, disabling.\n");
 240                 disable_xinerama(conn);
 241                 return;
 242         }
 243
 244         xcb_xinerama_is_active_reply_t *reply;
 245         reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 246
 247         if (reply == NULL || !reply->state) {
 248                 LOG("Xinerama is not active (in your X-Server), disabling.\n");
 249                 disable_xinerama(conn);
 250         } else
 251                 query_screens(conn, virtual_screens);
 252
 253         FREE(reply);
 254
 255         i3Screen *screen;
 256         num_screens = 0;
 257         /* Just go through each workspace and associate as many screens as we can. */
 258         TAILQ_FOREACH(screen, virtual_screens, screens) {
 259                 screen->num = num_screens;
 260                 num_screens++;
 261                 Workspace *ws = get_first_workspace_for_screen(virtual_screens, screen);
 262                 initialize_screen(conn, screen, ws);
 263         }
 264 }
 265
 266 /*
 267  * This is called when the rootwindow receives a configure_notify event and therefore the
 268  * number/position of the Xinerama screens could have changed.
 269  *
 270  */
 271 void xinerama_requery_screens(xcb_connection_t *conn) {
 272         i3Font *font = load_font(conn, config.font);
 273
 274         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 275            it change when I move the --right-of video projector to --left-of? */
 276
 277         if (!xinerama_enabled) {
 278                 LOG("Xinerama is disabled\n");
 279                 return;
 280         }
 281
 282         /* We use a separate copy to diff with the previous set of screens */
 283         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 284         TAILQ_INIT(new_screens);
 285
 286         query_screens(conn, new_screens);
 287
 288         i3Screen *first = TAILQ_FIRST(new_screens),
 289                  *screen,
 290                  *old_screen;
 291         int screen_count = 0;
 292         /* Mark each workspace which currently is assigned to a screen, so we
 293          * can garbage-collect afterwards */
 294         for (int c = 0; c < 10; c++)
 295                 workspaces[c].reassigned = (workspaces[c].screen == NULL);
 296
 297         TAILQ_FOREACH(screen, new_screens, screens) {
 298                 screen->num = screen_count;
 299                 screen->current_workspace = -1;
 300
 301                 TAILQ_FOREACH(old_screen, virtual_screens, screens) {
 302                         if (old_screen->num != screen_count)
 303                                 continue;
 304
 305                         LOG("Found a matching screen\n");
 306                         /* Use the same workspace */
 307                         screen->current_workspace = old_screen->current_workspace;
 308
 309                         /* Re-use the old bar window */
 310                         screen->bar = old_screen->bar;
 311                         screen->bargc = old_screen->bargc;
 312                         LOG("old_screen->bar = %p\n", old_screen->bar);
 313
 314                         Rect bar_rect = {screen->rect.x,
 315                                          screen->rect.height - (font->height + 6),
 316                                          screen->rect.x + screen->rect.width,
 317                                          font->height + 6};
 318
 319                         LOG("configuring bar to be at %d x %d with %d x %d\n",
 320                                         bar_rect.x, bar_rect.y, bar_rect.height, bar_rect.width);
 321                         xcb_configure_window(conn, screen->bar, XCB_CONFIG_WINDOW_X |
 322                                                                 XCB_CONFIG_WINDOW_Y |
 323                                                                 XCB_CONFIG_WINDOW_WIDTH |
 324                                                                 XCB_CONFIG_WINDOW_HEIGHT, &(bar_rect.x));
 325
 326                         /* Copy the list head for the dock clients */
 327                         screen->dock_clients = old_screen->dock_clients;
 328
 329                         /* Update the dimensions */
 330                         for (int c = 0; c < 10; c++) {
 331                                 Workspace *ws = &(workspaces[c]);
 332                                 if (ws->screen != old_screen)
 333                                         continue;
 334
 335                                 LOG("re-assigning ws %d\n", ws->num);
 336                                 memcpy(&(ws->rect), &(screen->rect), sizeof(Rect));
 337                                 ws->screen = screen;
 338                                 ws->reassigned = true;
 339                         }
 340
 341                         break;
 342                 }
 343                 if (screen->current_workspace == -1) {
 344                         /* Find the first unused workspace, preferring the ones
 345                          * which are assigned to this screen and initialize
 346                          * the screen with it. */
 347                         LOG("getting first ws for screen %p\n", screen);
 348                         Workspace *ws = get_first_workspace_for_screen(new_screens, screen);
 349                         initialize_screen(conn, screen, ws);
 350
 351                         /* As this workspace just got visible (we got a new screen
 352                          * without workspace), we need to map its clients */
 353                         workspace_map_clients(conn, ws);
 354                 }
 355                 screen_count++;
 356         }
 357
 358         /* Check for workspaces which are out of bounds */
 359         for (int c = 0; c < 10; c++) {
 360                 if (workspaces[c].reassigned)
 361                         continue;
 362
 363                 /* f_ws is a shortcut to the workspace to fix */
 364                 Workspace *f_ws = &(workspaces[c]);
 365                 Client *client;
 366
 367                 LOG("Closing bar window (%p)\n", f_ws->screen->bar);
 368                 xcb_destroy_window(conn, f_ws->screen->bar);
 369
 370                 LOG("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
 371                 f_ws->screen = first;
 372                 memcpy(&(f_ws->rect), &(first->rect), sizeof(Rect));
 373
 374                 /* Force reconfiguration for each client on that workspace */
 375                 FOR_TABLE(f_ws)
 376                         CIRCLEQ_FOREACH(client, &(f_ws->table[cols][rows]->clients), clients)
 377                                 client->force_reconfigure = true;
 378
 379                 /* Render the workspace to reconfigure the clients. However, they will be visible now, so… */
 380                 render_workspace(conn, first, f_ws);
 381
 382                 /* …unless we want to see them at the moment, we should hide that workspace */
 383                 if (workspace_is_visible(f_ws))
 384                         continue;
 385
 386                 workspace_unmap_clients(conn, f_ws);
 387
 388                 if (c_ws == f_ws) {
 389                         LOG("Need to adjust c_ws...\n");
 390                         c_ws = &(workspaces[first->current_workspace]);
 391                 }
 392         }
 393         xcb_flush(conn);
 394
 395         /* Free the old list */
 396         while (!TAILQ_EMPTY(virtual_screens)) {
 397                 screen = TAILQ_FIRST(virtual_screens);
 398                 TAILQ_REMOVE(virtual_screens, screen, screens);
 399                 free(screen);
 400         }
 401         free(virtual_screens);
 402
 403         virtual_screens = new_screens;
 404
 405         LOG("Current workspace is now: %d\n", first->current_workspace);
 406
 407         render_layout(conn);
 408 }