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