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 /*
 104  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
 105  *
 106  */
 107 static void disable_xinerama(xcb_connection_t *conn) {
 108         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 109
 110         i3Screen *s = calloc(sizeof(i3Screen), 1);
 111
 112         s->rect.x = 0;
 113         s->rect.y = 0;
 114         s->rect.width = root_screen->width_in_pixels;
 115         s->rect.height = root_screen->height_in_pixels;
 116
 117         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
 118
 119         xinerama_enabled = false;
 120 }
 121
 122 /*
 123  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
 124  * Xinerama screen which are configured in clone mode) in the given screenlist
 125  *
 126  */
 127 static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
 128         xcb_xinerama_query_screens_reply_t *reply;
 129         xcb_xinerama_screen_info_t *screen_info;
 130
 131         reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
 132         if (!reply) {
 133                 LOG("Couldn't get Xinerama screens\n");
 134                 return;
 135         }
 136         screen_info = xcb_xinerama_query_screens_screen_info(reply);
 137         int screens = xcb_xinerama_query_screens_screen_info_length(reply);
 138         num_screens = 0;
 139
 140         for (int screen = 0; screen < screens; screen++) {
 141                 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
 142                 if (s!= NULL) {
 143                         /* This screen already exists. We use the littlest screen so that the user
 144                            can always see the complete workspace */
 145                         s->rect.width = min(s->rect.width, screen_info[screen].width);
 146                         s->rect.height = min(s->rect.height, screen_info[screen].height);
 147                 } else {
 148                         s = calloc(sizeof(i3Screen), 1);
 149                         s->rect.x = screen_info[screen].x_org;
 150                         s->rect.y = screen_info[screen].y_org;
 151                         s->rect.width = screen_info[screen].width;
 152                         s->rect.height = screen_info[screen].height;
 153                         /* We always treat the screen at 0x0 as the primary screen */
 154                         if (s->rect.x == 0 && s->rect.y == 0)
 155                                 TAILQ_INSERT_HEAD(screenlist, s, screens);
 156                         else TAILQ_INSERT_TAIL(screenlist, s, screens);
 157                         num_screens++;
 158                 }
 159
 160                 LOG("found Xinerama screen: %d x %d at %d x %d\n",
 161                                 screen_info[screen].width, screen_info[screen].height,
 162                                 screen_info[screen].x_org, screen_info[screen].y_org);
 163         }
 164
 165         free(reply);
 166
 167         if (num_screens == 0) {
 168                 LOG("No screens found. This is weird.\n");
 169                 exit(1);
 170         }
 171 }
 172
 173 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
 174         i3Font *font = load_font(conn, config.font);
 175
 176         workspace->screen = screen;
 177         screen->current_workspace = workspace->num;
 178
 179         /* Create a bar for each screen */
 180         Rect bar_rect = {screen->rect.x,
 181                          screen->rect.height - (font->height + 6),
 182                          screen->rect.x + screen->rect.width,
 183                          font->height + 6};
 184         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 185         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 186         screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, mask, values);
 187         screen->bargc = xcb_generate_id(conn);
 188         xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
 189
 190         SLIST_INIT(&(screen->dock_clients));
 191
 192         /* Copy dimensions */
 193         memcpy(&(workspace->rect), &(screen->rect), sizeof(Rect));
 194         LOG("that is virtual screen at %d x %d with %d x %d\n",
 195                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 196 }
 197
 198 /*
 199  * We have just established a connection to the X server and need the initial Xinerama
 200  * information to setup workspaces for each screen.
 201  *
 202  */
 203 void initialize_xinerama(xcb_connection_t *conn) {
 204         virtual_screens = scalloc(sizeof(struct screens_head));
 205         TAILQ_INIT(virtual_screens);
 206
 207         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 208                 LOG("Xinerama extension not found, disabling.\n");
 209                 disable_xinerama(conn);
 210                 return;
 211         }
 212
 213         xcb_xinerama_is_active_reply_t *reply;
 214         reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 215
 216         if (reply == NULL || !reply->state) {
 217                 LOG("Xinerama is not active (in your X-Server), disabling.\n");
 218                 disable_xinerama(conn);
 219         } else
 220                 query_screens(conn, virtual_screens);
 221
 222         FREE(reply);
 223
 224         i3Screen *s;
 225         num_screens = 0;
 226         /* Just go through each workspace and associate as many screens as we can. */
 227         TAILQ_FOREACH(s, virtual_screens, screens) {
 228                 s->num = num_screens;
 229                 initialize_screen(conn, s, &(workspaces[num_screens]));
 230                 num_screens++;
 231         }
 232 }
 233
 234 /*
 235  * This is called when the rootwindow receives a configure_notify event and therefore the
 236  * number/position of the Xinerama screens could have changed.
 237  *
 238  */
 239 void xinerama_requery_screens(xcb_connection_t *conn) {
 240         i3Font *font = load_font(conn, config.font);
 241
 242         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 243            it change when I move the --right-of video projector to --left-of? */
 244
 245         if (!xinerama_enabled) {
 246                 LOG("Xinerama is disabled\n");
 247                 return;
 248         }
 249
 250         /* We use a separate copy to diff with the previous set of screens */
 251         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 252         TAILQ_INIT(new_screens);
 253
 254         query_screens(conn, new_screens);
 255
 256         i3Screen *first = TAILQ_FIRST(new_screens),
 257                  *screen;
 258         int screen_count = 0;
 259         TAILQ_FOREACH(screen, new_screens, screens) {
 260                 screen->num = screen_count;
 261                 screen->current_workspace = -1;
 262                 for (int c = 0; c < 10; c++)
 263                         if ((workspaces[c].screen != NULL) &&
 264                             (workspaces[c].screen->num == screen_count)) {
 265                                 LOG("Found a matching screen\n");
 266                                 /* Try to use the same workspace, if it’s available */
 267                                 if (workspaces[c].screen->current_workspace)
 268                                         screen->current_workspace = workspaces[c].screen->current_workspace;
 269
 270                                 if (screen->current_workspace == -1)
 271                                         screen->current_workspace = c;
 272
 273                                 /* Re-use the old bar window */
 274                                 screen->bar = workspaces[c].screen->bar;
 275                                 screen->bargc = workspaces[c].screen->bargc;
 276
 277                                 Rect bar_rect = {screen->rect.x,
 278                                                  screen->rect.height - (font->height + 6),
 279                                                  screen->rect.x + screen->rect.width,
 280                                                  font->height + 6};
 281
 282                                 xcb_configure_window(conn, screen->bar, XCB_CONFIG_WINDOW_X |
 283                                                                         XCB_CONFIG_WINDOW_Y |
 284                                                                         XCB_CONFIG_WINDOW_WIDTH |
 285                                                                         XCB_CONFIG_WINDOW_HEIGHT, &(bar_rect.x));
 286
 287                                 /* Copy the list head for the dock clients */
 288                                 screen->dock_clients = workspaces[c].screen->dock_clients;
 289
 290                                 /* Update the dimensions */
 291                                 memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
 292                                 workspaces[c].screen = screen;
 293                         }
 294                 if (screen->current_workspace == -1) {
 295                         /* Create a new workspace for this screen, it’s new */
 296                         for (int c = 0; c < 10; c++)
 297                                 if (workspaces[c].screen == NULL) {
 298                                         LOG("fix: initializing new workspace, setting num to %d\n", c);
 299                                         initialize_screen(conn, screen, &(workspaces[c]));
 300                                         break;
 301                                 }
 302                 }
 303                 screen_count++;
 304         }
 305
 306         /* Check for workspaces which are out of bounds */
 307         for (int c = 0; c < 10; c++)
 308                 if ((workspaces[c].screen != NULL) &&
 309                     (workspaces[c].screen->num >= num_screens)) {
 310                         LOG("Closing bar window\n");
 311                         xcb_destroy_window(conn, workspaces[c].screen->bar);
 312
 313                         LOG("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
 314                         workspaces[c].screen = first;
 315                         memcpy(&(workspaces[c].rect), &(first->rect), sizeof(Rect));
 316                 }
 317
 318         /* Free the old list */
 319         while (!TAILQ_EMPTY(virtual_screens)) {
 320                 screen = TAILQ_FIRST(virtual_screens);
 321                 TAILQ_REMOVE(virtual_screens, screen, screens);
 322                 free(screen);
 323         }
 324         free(virtual_screens);
 325
 326         virtual_screens = new_screens;
 327
 328         LOG("Current workspace is now: %d\n", first->current_workspace);
 329
 330         render_layout(conn);
 331 }