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
 168 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
 169         i3Font *font = load_font(conn, config.font);
 170
 171         workspace->screen = screen;
 172         screen->current_workspace = workspace->num;
 173
 174         /* Create a bar for each screen */
 175         Rect bar_rect = {screen->rect.x,
 176                          screen->rect.height - (font->height + 6),
 177                          screen->rect.x + screen->rect.width,
 178                          font->height + 6};
 179         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 180         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 181         screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, mask, values);
 182         screen->bargc = xcb_generate_id(conn);
 183         xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
 184
 185         SLIST_INIT(&(screen->dock_clients));
 186
 187         /* Copy dimensions */
 188         memcpy(&(workspace->rect), &(screen->rect), sizeof(Rect));
 189         LOG("that is virtual screen at %d x %d with %d x %d\n",
 190                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 191 }
 192
 193 /*
 194  * We have just established a connection to the X server and need the initial Xinerama
 195  * information to setup workspaces for each screen.
 196  *
 197  */
 198 void initialize_xinerama(xcb_connection_t *conn) {
 199         virtual_screens = scalloc(sizeof(struct screens_head));
 200         TAILQ_INIT(virtual_screens);
 201
 202         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 203                 LOG("Xinerama extension not found, disabling.\n");
 204                 disable_xinerama(conn);
 205                 return;
 206         }
 207
 208         xcb_xinerama_is_active_reply_t *reply;
 209         reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 210
 211         if (reply == NULL || !reply->state) {
 212                 LOG("Xinerama is not active (in your X-Server), disabling.\n");
 213                 disable_xinerama(conn);
 214         } else
 215                 query_screens(conn, virtual_screens);
 216
 217         FREE(reply);
 218
 219         i3Screen *s;
 220         num_screens = 0;
 221         /* Just go through each workspace and associate as many screens as we can. */
 222         TAILQ_FOREACH(s, virtual_screens, screens) {
 223                 s->num = num_screens;
 224                 initialize_screen(conn, s, &(workspaces[num_screens]));
 225                 num_screens++;
 226         }
 227 }
 228
 229 /*
 230  * This is called when the rootwindow receives a configure_notify event and therefore the
 231  * number/position of the Xinerama screens could have changed.
 232  *
 233  */
 234 void xinerama_requery_screens(xcb_connection_t *conn) {
 235         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 236            it change when I move the --right-of video projector to --left-of? */
 237
 238         if (!xinerama_enabled) {
 239                 LOG("Xinerama is disabled\n");
 240                 return;
 241         }
 242
 243         /* We use a separate copy to diff with the previous set of screens */
 244         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 245         TAILQ_INIT(new_screens);
 246
 247         query_screens(conn, new_screens);
 248
 249         i3Screen *first = TAILQ_FIRST(new_screens),
 250                  *screen;
 251         int screen_count = 0;
 252         TAILQ_FOREACH(screen, new_screens, screens) {
 253                 screen->num = screen_count;
 254                 screen->current_workspace = -1;
 255                 for (int c = 0; c < 10; c++)
 256                         if ((workspaces[c].screen != NULL) &&
 257                             (workspaces[c].screen->num == screen_count)) {
 258                                 LOG("Found a matching screen\n");
 259                                 /* Try to use the same workspace, if it’s available */
 260                                 if (workspaces[c].screen->current_workspace)
 261                                         screen->current_workspace = workspaces[c].screen->current_workspace;
 262
 263                                 if (screen->current_workspace == -1)
 264                                         screen->current_workspace = c;
 265
 266                                 /* Re-use the old bar window */
 267                                 screen->bar = workspaces[c].screen->bar;
 268                                 screen->bargc = workspaces[c].screen->bargc;
 269
 270                                 /* Copy the list head for the dock clients */
 271                                 screen->dock_clients = workspaces[c].screen->dock_clients;
 272
 273                                 /* Update the dimensions */
 274                                 memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
 275                                 workspaces[c].screen = screen;
 276                         }
 277                 if (screen->current_workspace == -1) {
 278                         /* Create a new workspace for this screen, it’s new */
 279                         for (int c = 0; c < 10; c++)
 280                                 if (workspaces[c].screen == NULL) {
 281                                         LOG("fix: initializing new workspace, setting num to %d\n", c);
 282                                         initialize_screen(conn, screen, &(workspaces[c]));
 283                                         break;
 284                                 }
 285                 }
 286                 screen_count++;
 287         }
 288
 289         /* Check for workspaces which are out of bounds */
 290         for (int c = 0; c < 10; c++)
 291                 if ((workspaces[c].screen != NULL) &&
 292                     (workspaces[c].screen->num >= num_screens)) {
 293                         LOG("Closing bar window\n");
 294                         xcb_destroy_window(conn, workspaces[c].screen->bar);
 295
 296                         LOG("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
 297                         workspaces[c].screen = first;
 298                         memcpy(&(workspaces[c].rect), &(first->rect), sizeof(Rect));
 299                 }
 300
 301         /* Free the old list */
 302         while (!TAILQ_EMPTY(virtual_screens)) {
 303                 screen = TAILQ_FIRST(virtual_screens);
 304                 TAILQ_REMOVE(virtual_screens, screen, screens);
 305                 free(screen);
 306         }
 307         free(virtual_screens);
 308
 309         virtual_screens = new_screens;
 310
 311         LOG("Current workspace is now: %d\n", first->current_workspace);
 312
 313         render_layout(conn);
 314 }