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  * (c) 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
  15 #include <xcb/xcb.h>
  16 #include <xcb/xinerama.h>
  17
  18 #include "queue.h"
  19 #include "i3.h"
  20 #include "data.h"
  21 #include "table.h"
  22 #include "util.h"
  23 #include "xinerama.h"
  24
  25 /* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
  26  * (xrandr --same-as) */
  27 struct screens_head virtual_screens = TAILQ_HEAD_INITIALIZER(virtual_screens);
  28
  29 /*
  30  * Looks in virtual_screens for the i3Screen whose start coordinates are x, y
  31  *
  32  */
  33 i3Screen *get_screen_at(int x, int y) {
  34         i3Screen *screen;
  35         TAILQ_FOREACH(screen, &virtual_screens, screens)
  36                 if (screen->rect.x == x && screen->rect.y == y)
  37                         return screen;
  38
  39         return NULL;
  40 }
  41
  42 /*
  43  * Looks in virtual_screens for the i3Screen which contains coordinates x, y
  44  *
  45  */
  46 i3Screen *get_screen_containing(int x, int y) {
  47         i3Screen *screen;
  48         TAILQ_FOREACH(screen, &virtual_screens, screens)
  49                 if (x > screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
  50                     y > screen->rect.y && y < (screen->rect.y + screen->rect.height))
  51                         return screen;
  52
  53         return NULL;
  54 }
  55
  56 /*
  57  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
  58  *
  59  */
  60 static void disable_xinerama(xcb_connection_t *connection) {
  61         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
  62
  63         i3Screen *s = calloc(sizeof(i3Screen), 1);
  64
  65         s->rect.x = 0;
  66         s->rect.y = 0;
  67         s->rect.width = root_screen->width_in_pixels;
  68         s->rect.height = root_screen->height_in_pixels;
  69
  70         TAILQ_INSERT_TAIL(&virtual_screens, s, screens);
  71 }
  72
  73 /*
  74  * We have just established a connection to the X server and need the initial Xinerama
  75  * information to setup workspaces for each screen.
  76  *
  77  */
  78 void initialize_xinerama(xcb_connection_t *conn) {
  79         xcb_xinerama_query_screens_reply_t *reply;
  80         xcb_xinerama_screen_info_t *screen_info;
  81
  82         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
  83                 printf("Xinerama extension not found, disabling.\n");
  84                 disable_xinerama(conn);
  85                 return;
  86         }
  87
  88         if (!xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL)->state) {
  89                 printf("Xinerama is not active (in your X-Server), disabling.\n");
  90                 disable_xinerama(conn);
  91                 return;
  92         }
  93
  94         reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
  95         if (!reply) {
  96                 printf("Couldn’t get active Xinerama screens\n");
  97                 return;
  98         }
  99         screen_info = xcb_xinerama_query_screens_screen_info(reply);
 100         num_screens = xcb_xinerama_query_screens_screen_info_length(reply);
 101
 102         /* Just go through each workspace and associate as many screens as we can. */
 103         for (int screen = 0; screen < num_screens; screen++) {
 104                 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org);
 105                 if (s!= NULL) {
 106                         /* This screen already exists. We use the littlest screen so that the user
 107                            can always see the complete workspace */
 108                         s->rect.width = min(s->rect.width, screen_info[screen].width);
 109                         s->rect.height = min(s->rect.height, screen_info[screen].height);
 110                 } else {
 111                         s = calloc(sizeof(i3Screen), 1);
 112                         s->rect.x = screen_info[screen].x_org;
 113                         s->rect.y = screen_info[screen].y_org;
 114                         s->rect.width = screen_info[screen].width;
 115                         s->rect.height = screen_info[screen].height;
 116                         TAILQ_INSERT_TAIL(&virtual_screens, s, screens);
 117                 }
 118
 119                 printf("found Xinerama screen: %d x %d at %d x %d\n",
 120                                 screen_info[screen].width, screen_info[screen].height,
 121                                 screen_info[screen].x_org, screen_info[screen].y_org);
 122         }
 123
 124         i3Screen *s;
 125         num_screens = 0;
 126         TAILQ_FOREACH(s, &virtual_screens, screens) {
 127                 s->num = num_screens;
 128                 s->current_workspace = num_screens;
 129                 workspaces[num_screens].screen = s;
 130                 memcpy(&(workspaces[num_screens++].rect), &(s->rect), sizeof(Rect));
 131                 printf("that is virtual screen at %d x %d with %d x %d\n",
 132                                 s->rect.x, s->rect.y, s->rect.width, s->rect.height);
 133         }
 134
 135         free(screen_info);
 136 }