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
  16 #include <xcb/xcb.h>
  17 #include <xcb/xinerama.h>
  18
  19 #include "queue.h"
  20 #include "i3.h"
  21 #include "data.h"
  22 #include "table.h"
  23 #include "util.h"
  24 #include "xinerama.h"
  25 #include "layout.h"
  26 #include "xcb.h"
  27 #include "config.h"
  28
  29 /* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
  30  * (xrandr --same-as) */
  31 struct screens_head *virtual_screens;
  32
  33 static bool xinerama_enabled = true;
  34
  35 /*
  36  * Looks in virtual_screens for the i3Screen whose start coordinates are x, y
  37  *
  38  */
  39 i3Screen *get_screen_at(int x, int y, struct screens_head *screenlist) {
  40         i3Screen *screen;
  41         TAILQ_FOREACH(screen, screenlist, screens)
  42                 if (screen->rect.x == x && screen->rect.y == y)
  43                         return screen;
  44
  45         return NULL;
  46 }
  47
  48 /*
  49  * Looks in virtual_screens for the i3Screen which contains coordinates x, y
  50  *
  51  */
  52 i3Screen *get_screen_containing(int x, int y) {
  53         i3Screen *screen;
  54         TAILQ_FOREACH(screen, virtual_screens, screens) {
  55                 LOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
  56                                 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
  57                 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
  58                     y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
  59                         return screen;
  60         }
  61
  62         return NULL;
  63 }
  64
  65 /*
  66  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
  67  *
  68  */
  69 static void disable_xinerama(xcb_connection_t *conn) {
  70         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
  71
  72         i3Screen *s = calloc(sizeof(i3Screen), 1);
  73
  74         s->rect.x = 0;
  75         s->rect.y = 0;
  76         s->rect.width = root_screen->width_in_pixels;
  77         s->rect.height = root_screen->height_in_pixels;
  78
  79         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
  80
  81         xinerama_enabled = false;
  82 }
  83
  84 /*
  85  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
  86  * Xinerama screen which are configured in clone mode) in the given screenlist
  87  *
  88  */
  89 static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
  90         xcb_xinerama_query_screens_reply_t *reply;
  91         xcb_xinerama_screen_info_t *screen_info;
  92
  93         reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
  94         if (!reply) {
  95                 LOG("Couldn't get Xinerama screens\n");
  96                 return;
  97         }
  98         screen_info = xcb_xinerama_query_screens_screen_info(reply);
  99         int screens = xcb_xinerama_query_screens_screen_info_length(reply);
 100         num_screens = 0;
 101
 102         for (int screen = 0; screen < screens; screen++) {
 103                 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
 104                 if (s!= NULL) {
 105                         /* This screen already exists. We use the littlest screen so that the user
 106                            can always see the complete workspace */
 107                         s->rect.width = min(s->rect.width, screen_info[screen].width);
 108                         s->rect.height = min(s->rect.height, screen_info[screen].height);
 109                 } else {
 110                         s = calloc(sizeof(i3Screen), 1);
 111                         s->rect.x = screen_info[screen].x_org;
 112                         s->rect.y = screen_info[screen].y_org;
 113                         s->rect.width = screen_info[screen].width;
 114                         s->rect.height = screen_info[screen].height;
 115                         /* We always treat the screen at 0x0 as the primary screen */
 116                         if (s->rect.x == 0 && s->rect.y == 0)
 117                                 TAILQ_INSERT_HEAD(screenlist, s, screens);
 118                         else TAILQ_INSERT_TAIL(screenlist, s, screens);
 119                         num_screens++;
 120                 }
 121
 122                 LOG("found Xinerama screen: %d x %d at %d x %d\n",
 123                                 screen_info[screen].width, screen_info[screen].height,
 124                                 screen_info[screen].x_org, screen_info[screen].y_org);
 125         }
 126
 127         free(reply);
 128 }
 129
 130 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
 131         i3Font *font = load_font(conn, config.font);
 132
 133         workspace->screen = screen;
 134         screen->current_workspace = workspace->num;
 135
 136         /* Create a bar for each screen */
 137         Rect bar_rect = {screen->rect.x,
 138                          screen->rect.height - (font->height + 6),
 139                          screen->rect.x + screen->rect.width,
 140                          font->height + 6};
 141         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 142         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE};
 143         screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, mask, values);
 144         screen->bargc = xcb_generate_id(conn);
 145         xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
 146
 147         /* Copy dimensions */
 148         memcpy(&(workspace->rect), &(screen->rect), sizeof(Rect));
 149         LOG("that is virtual screen at %d x %d with %d x %d\n",
 150                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 151 }
 152
 153 /*
 154  * We have just established a connection to the X server and need the initial Xinerama
 155  * information to setup workspaces for each screen.
 156  *
 157  */
 158 void initialize_xinerama(xcb_connection_t *conn) {
 159         virtual_screens = scalloc(sizeof(struct screens_head));
 160         TAILQ_INIT(virtual_screens);
 161
 162         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 163                 LOG("Xinerama extension not found, disabling.\n");
 164                 disable_xinerama(conn);
 165                 return;
 166         }
 167
 168         xcb_xinerama_is_active_reply_t *reply;
 169         reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 170
 171         if (!reply->state) {
 172                 LOG("Xinerama is not active (in your X-Server), disabling.\n");
 173                 free(reply);
 174                 disable_xinerama(conn);
 175                 return;
 176         }
 177
 178         free(reply);
 179
 180         query_screens(conn, virtual_screens);
 181
 182         i3Screen *s;
 183         num_screens = 0;
 184         /* Just go through each workspace and associate as many screens as we can. */
 185         TAILQ_FOREACH(s, virtual_screens, screens) {
 186                 s->num = num_screens;
 187                 initialize_screen(conn, s, &(workspaces[num_screens]));
 188                 num_screens++;
 189         }
 190 }
 191
 192 /*
 193  * This is called when the rootwindow receives a configure_notify event and therefore the
 194  * number/position of the Xinerama screens could have changed.
 195  *
 196  */
 197 void xinerama_requery_screens(xcb_connection_t *conn) {
 198         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 199            it change when I move the --right-of video projector to --left-of? */
 200
 201         if (!xinerama_enabled) {
 202                 LOG("Xinerama is disabled\n");
 203                 return;
 204         }
 205
 206         /* We use a separate copy to diff with the previous set of screens */
 207         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 208         TAILQ_INIT(new_screens);
 209
 210         query_screens(conn, new_screens);
 211
 212         i3Screen *first = TAILQ_FIRST(new_screens),
 213                  *screen;
 214         int screen_count = 0;
 215         TAILQ_FOREACH(screen, new_screens, screens) {
 216                 screen->num = screen_count;
 217                 screen->current_workspace = -1;
 218                 for (int c = 0; c < 10; c++)
 219                         if ((workspaces[c].screen != NULL) &&
 220                             (workspaces[c].screen->num == screen_count)) {
 221                                 LOG("Found a matching screen\n");
 222                                 /* Try to use the same workspace, if it’s available */
 223                                 if (workspaces[c].screen->current_workspace)
 224                                         screen->current_workspace = workspaces[c].screen->current_workspace;
 225
 226                                 if (screen->current_workspace == -1)
 227                                         screen->current_workspace = c;
 228
 229                                 /* Re-use the old bar window */
 230                                 screen->bar = workspaces[c].screen->bar;
 231                                 screen->bargc = workspaces[c].screen->bargc;
 232
 233                                 /* Update the dimensions */
 234                                 memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
 235                                 workspaces[c].screen = screen;
 236                         }
 237                 if (screen->current_workspace == -1) {
 238                         /* Create a new workspace for this screen, it’s new */
 239                         for (int c = 0; c < 10; c++)
 240                                 if (workspaces[c].screen == NULL) {
 241                                         LOG("fix: initializing new workspace, setting num to %d\n", c);
 242                                         initialize_screen(conn, screen, &(workspaces[c]));
 243                                         break;
 244                                 }
 245                 }
 246                 screen_count++;
 247         }
 248
 249         /* Check for workspaces which are out of bounds */
 250         for (int c = 0; c < 10; c++)
 251                 if ((workspaces[c].screen != NULL) &&
 252                     (workspaces[c].screen->num >= num_screens)) {
 253                         LOG("Closing bar window\n");
 254                         xcb_destroy_window(conn, workspaces[c].screen->bar);
 255
 256                         LOG("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
 257                         workspaces[c].screen = first;
 258                         memcpy(&(workspaces[c].rect), &(first->rect), sizeof(Rect));
 259                 }
 260
 261         /* Free the old list */
 262         while (!TAILQ_EMPTY(virtual_screens)) {
 263                 screen = TAILQ_FIRST(virtual_screens);
 264                 TAILQ_REMOVE(virtual_screens, screen, screens);
 265                 free(screen);
 266         }
 267         free(virtual_screens);
 268
 269         virtual_screens = new_screens;
 270
 271         LOG("Current workspace is now: %d\n", first->current_workspace);
 272
 273         render_layout(conn);
 274 }