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
  17 #include <xcb/xcb.h>
  18 #include <xcb/xinerama.h>
  19
  20 #include "queue.h"
  21 #include "i3.h"
  22 #include "data.h"
  23 #include "table.h"
  24 #include "util.h"
  25 #include "xinerama.h"
  26 #include "layout.h"
  27 #include "xcb.h"
  28 #include "config.h"
  29
  30 /* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
  31  * (xrandr --same-as) */
  32 struct screens_head *virtual_screens;
  33
  34 static bool xinerama_enabled = true;
  35
  36 /*
  37  * Looks in virtual_screens for the i3Screen whose start coordinates are x, y
  38  *
  39  */
  40 i3Screen *get_screen_at(int x, int y, struct screens_head *screenlist) {
  41         i3Screen *screen;
  42         TAILQ_FOREACH(screen, screenlist, screens)
  43                 if (screen->rect.x == x && screen->rect.y == y)
  44                         return screen;
  45
  46         return NULL;
  47 }
  48
  49 /*
  50  * Looks in virtual_screens for the i3Screen which contains coordinates x, y
  51  *
  52  */
  53 i3Screen *get_screen_containing(int x, int y) {
  54         i3Screen *screen;
  55         TAILQ_FOREACH(screen, virtual_screens, screens) {
  56                 LOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
  57                                 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
  58                 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
  59                     y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
  60                         return screen;
  61         }
  62
  63         return NULL;
  64 }
  65
  66 /*
  67  * Gets the screen which is the last one in the given direction, for example the screen
  68  * on the most bottom when direction == D_DOWN, the screen most right when direction == D_RIGHT
  69  * and so on.
  70  *
  71  * This function always returns a screen.
  72  *
  73  */
  74 i3Screen *get_screen_most(direction_t direction) {
  75         i3Screen *screen, *candidate = NULL;
  76         int position = 0;
  77         TAILQ_FOREACH(screen, virtual_screens, screens) {
  78                 /* Repeated calls of WIN determine the winner of the comparison */
  79                 #define WIN(variable, condition) \
  80                         if (variable condition) { \
  81                                 candidate = screen; \
  82                                 position = variable; \
  83                         } \
  84                         break;
  85
  86                 switch (direction) {
  87                         case D_UP:
  88                                 WIN(screen->rect.y, <= position);
  89                         case D_DOWN:
  90                                 WIN(screen->rect.y, >= position);
  91                         case D_LEFT:
  92                                 WIN(screen->rect.x, <= position);
  93                         case D_RIGHT:
  94                                 WIN(screen->rect.x, >= position);
  95                 }
  96         }
  97
  98         assert(candidate != NULL);
  99
 100         return candidate;
 101 }
 102
 103 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
 104         i3Font *font = load_font(conn, config.font);
 105
 106         workspace->screen = screen;
 107         screen->current_workspace = workspace->num;
 108
 109         /* Create a bar for each screen */
 110         Rect bar_rect = {screen->rect.x,
 111                          screen->rect.height - (font->height + 6),
 112                          screen->rect.x + screen->rect.width,
 113                          font->height + 6};
 114         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 115         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 116         screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, mask, values);
 117         screen->bargc = xcb_generate_id(conn);
 118         xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
 119
 120         SLIST_INIT(&(screen->dock_clients));
 121
 122         /* Copy dimensions */
 123         memcpy(&(workspace->rect), &(screen->rect), sizeof(Rect));
 124         LOG("that is virtual screen at %d x %d with %d x %d\n",
 125                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 126 }
 127
 128 /*
 129  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
 130  *
 131  */
 132 static void disable_xinerama(xcb_connection_t *conn) {
 133         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 134
 135         i3Screen *s = calloc(sizeof(i3Screen), 1);
 136
 137         s->rect.x = 0;
 138         s->rect.y = 0;
 139         s->rect.width = root_screen->width_in_pixels;
 140         s->rect.height = root_screen->height_in_pixels;
 141
 142         num_screens = 1;
 143         s->num = 0;
 144         initialize_screen(conn, s, &(workspaces[0]));
 145
 146         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
 147
 148         xinerama_enabled = false;
 149 }
 150
 151 /*
 152  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
 153  * Xinerama screen which are configured in clone mode) in the given screenlist
 154  *
 155  */
 156 static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
 157         xcb_xinerama_query_screens_reply_t *reply;
 158         xcb_xinerama_screen_info_t *screen_info;
 159
 160         reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
 161         if (!reply) {
 162                 LOG("Couldn't get Xinerama screens\n");
 163                 return;
 164         }
 165         screen_info = xcb_xinerama_query_screens_screen_info(reply);
 166         int screens = xcb_xinerama_query_screens_screen_info_length(reply);
 167         num_screens = 0;
 168
 169         for (int screen = 0; screen < screens; screen++) {
 170                 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
 171                 if (s!= NULL) {
 172                         /* This screen already exists. We use the littlest screen so that the user
 173                            can always see the complete workspace */
 174                         s->rect.width = min(s->rect.width, screen_info[screen].width);
 175                         s->rect.height = min(s->rect.height, screen_info[screen].height);
 176                 } else {
 177                         s = calloc(sizeof(i3Screen), 1);
 178                         s->rect.x = screen_info[screen].x_org;
 179                         s->rect.y = screen_info[screen].y_org;
 180                         s->rect.width = screen_info[screen].width;
 181                         s->rect.height = screen_info[screen].height;
 182                         /* We always treat the screen at 0x0 as the primary screen */
 183                         if (s->rect.x == 0 && s->rect.y == 0)
 184                                 TAILQ_INSERT_HEAD(screenlist, s, screens);
 185                         else TAILQ_INSERT_TAIL(screenlist, s, screens);
 186                         num_screens++;
 187                 }
 188
 189                 LOG("found Xinerama screen: %d x %d at %d x %d\n",
 190                                 screen_info[screen].width, screen_info[screen].height,
 191                                 screen_info[screen].x_org, screen_info[screen].y_org);
 192         }
 193
 194         free(reply);
 195
 196         if (num_screens == 0) {
 197                 LOG("No screens found. This is weird.\n");
 198                 exit(1);
 199         }
 200 }
 201
 202 /*
 203  * We have just established a connection to the X server and need the initial Xinerama
 204  * information to setup workspaces for each screen.
 205  *
 206  */
 207 void initialize_xinerama(xcb_connection_t *conn) {
 208         virtual_screens = scalloc(sizeof(struct screens_head));
 209         TAILQ_INIT(virtual_screens);
 210
 211         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 212                 LOG("Xinerama extension not found, disabling.\n");
 213                 disable_xinerama(conn);
 214                 return;
 215         }
 216
 217         xcb_xinerama_is_active_reply_t *reply;
 218         reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 219
 220         if (reply == NULL || !reply->state) {
 221                 LOG("Xinerama is not active (in your X-Server), disabling.\n");
 222                 disable_xinerama(conn);
 223         } else
 224                 query_screens(conn, virtual_screens);
 225
 226         FREE(reply);
 227
 228         i3Screen *s;
 229         num_screens = 0;
 230         /* Just go through each workspace and associate as many screens as we can. */
 231         TAILQ_FOREACH(s, virtual_screens, screens) {
 232                 s->num = num_screens;
 233                 initialize_screen(conn, s, &(workspaces[num_screens]));
 234                 num_screens++;
 235         }
 236 }
 237
 238 /*
 239  * This is called when the rootwindow receives a configure_notify event and therefore the
 240  * number/position of the Xinerama screens could have changed.
 241  *
 242  */
 243 void xinerama_requery_screens(xcb_connection_t *conn) {
 244         i3Font *font = load_font(conn, config.font);
 245
 246         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 247            it change when I move the --right-of video projector to --left-of? */
 248
 249         if (!xinerama_enabled) {
 250                 LOG("Xinerama is disabled\n");
 251                 return;
 252         }
 253
 254         /* We use a separate copy to diff with the previous set of screens */
 255         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 256         TAILQ_INIT(new_screens);
 257
 258         query_screens(conn, new_screens);
 259
 260         i3Screen *first = TAILQ_FIRST(new_screens),
 261                  *screen;
 262         int screen_count = 0;
 263         TAILQ_FOREACH(screen, new_screens, screens) {
 264                 screen->num = screen_count;
 265                 screen->current_workspace = -1;
 266                 for (int c = 0; c < 10; c++)
 267                         if ((workspaces[c].screen != NULL) &&
 268                             (workspaces[c].screen->num == screen_count)) {
 269                                 LOG("Found a matching screen\n");
 270                                 /* Try to use the same workspace, if it’s available */
 271                                 if (workspaces[c].screen->current_workspace)
 272                                         screen->current_workspace = workspaces[c].screen->current_workspace;
 273
 274                                 if (screen->current_workspace == -1)
 275                                         screen->current_workspace = c;
 276
 277                                 /* Re-use the old bar window */
 278                                 screen->bar = workspaces[c].screen->bar;
 279                                 screen->bargc = workspaces[c].screen->bargc;
 280
 281                                 Rect bar_rect = {screen->rect.x,
 282                                                  screen->rect.height - (font->height + 6),
 283                                                  screen->rect.x + screen->rect.width,
 284                                                  font->height + 6};
 285
 286                                 xcb_configure_window(conn, screen->bar, XCB_CONFIG_WINDOW_X |
 287                                                                         XCB_CONFIG_WINDOW_Y |
 288                                                                         XCB_CONFIG_WINDOW_WIDTH |
 289                                                                         XCB_CONFIG_WINDOW_HEIGHT, &(bar_rect.x));
 290
 291                                 /* Copy the list head for the dock clients */
 292                                 screen->dock_clients = workspaces[c].screen->dock_clients;
 293
 294                                 /* Update the dimensions */
 295                                 memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
 296                                 workspaces[c].screen = screen;
 297                         }
 298                 if (screen->current_workspace == -1) {
 299                         /* Create a new workspace for this screen, it’s new */
 300                         for (int c = 0; c < 10; c++)
 301                                 if (workspaces[c].screen == NULL) {
 302                                         LOG("fix: initializing new workspace, setting num to %d\n", c);
 303                                         initialize_screen(conn, screen, &(workspaces[c]));
 304                                         break;
 305                                 }
 306                 }
 307                 screen_count++;
 308         }
 309
 310         /* Check for workspaces which are out of bounds */
 311         for (int c = 0; c < 10; c++) {
 312                 if ((workspaces[c].screen == NULL) || (workspaces[c].screen->num < num_screens))
 313                         continue;
 314
 315                 /* f_ws is a shortcut to the workspace to fix */
 316                 Workspace *f_ws = &(workspaces[c]);
 317                 Client *client;
 318
 319                 LOG("Closing bar window\n");
 320                 xcb_destroy_window(conn, f_ws->screen->bar);
 321
 322                 LOG("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
 323                 f_ws->screen = first;
 324                 memcpy(&(f_ws->rect), &(first->rect), sizeof(Rect));
 325
 326                 /* Force reconfiguration for each client on that workspace */
 327                 FOR_TABLE(f_ws)
 328                         CIRCLEQ_FOREACH(client, &(f_ws->table[cols][rows]->clients), clients)
 329                                 client->force_reconfigure = true;
 330
 331                 /* Render the workspace to reconfigure the clients. However, they will be visible now, so… */
 332                 render_workspace(conn, first, f_ws);
 333
 334                 /* …unless we want to see them at the moment, we should hide that workspace */
 335                 if (first->current_workspace == c)
 336                         continue;
 337
 338                 unmap_workspace(conn, f_ws);
 339         }
 340         xcb_flush(conn);
 341
 342         /* Free the old list */
 343         while (!TAILQ_EMPTY(virtual_screens)) {
 344                 screen = TAILQ_FIRST(virtual_screens);
 345                 TAILQ_REMOVE(virtual_screens, screen, screens);
 346                 free(screen);
 347         }
 348         free(virtual_screens);
 349
 350         virtual_screens = new_screens;
 351
 352         LOG("Current workspace is now: %d\n", first->current_workspace);
 353
 354         render_layout(conn);
 355 }