git.sur5r.net Git - i3/i3lock/blob - xinerama.c

   1 /*
   2  * vim:ts=4:sw=4:expandtab
   3  *
   4  * © 2010-2012 Michael Stapelberg
   5  *
   6  * See LICENSE for licensing information
   7  *
   8  */
   9 #include <stdbool.h>
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <math.h>
  13 #include <xcb/xcb.h>
  14 #include <xcb/xinerama.h>
  15
  16 #include "xcb.h"
  17 #include "xinerama.h"
  18
  19 /* Number of Xinerama screens which are currently present. */
  20 int xr_screens = 0;
  21
  22 /* The resolutions of the currently present Xinerama screens. */
  23 Rect *xr_resolutions;
  24
  25 static bool xinerama_active;
  26
  27 void xinerama_init() {
  28     if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
  29         printf("Xinerama extension not found, disabling.\n");
  30         return;
  31     }
  32
  33     xcb_xinerama_is_active_cookie_t cookie;
  34     xcb_xinerama_is_active_reply_t *reply;
  35
  36     cookie = xcb_xinerama_is_active(conn);
  37     reply = xcb_xinerama_is_active_reply(conn, cookie, NULL);
  38     if (!reply)
  39         return;
  40
  41     if (!reply->state) {
  42         free(reply);
  43         return;
  44     }
  45
  46     xinerama_active = true;
  47 }
  48
  49 void xinerama_query_screens() {
  50     if (!xinerama_active)
  51         return;
  52
  53     xcb_xinerama_query_screens_cookie_t cookie;
  54     xcb_xinerama_query_screens_reply_t *reply;
  55     xcb_xinerama_screen_info_t *screen_info;
  56
  57     cookie = xcb_xinerama_query_screens_unchecked(conn);
  58     reply = xcb_xinerama_query_screens_reply(conn, cookie, NULL);
  59     if (!reply) {
  60         fprintf(stderr, "Couldn't get Xinerama screens\n");
  61         return;
  62     }
  63     screen_info = xcb_xinerama_query_screens_screen_info(reply);
  64     int screens = xcb_xinerama_query_screens_screen_info_length(reply);
  65
  66     Rect *resolutions = malloc(screens * sizeof(Rect));
  67     /* No memory? Just keep on using the old information. */
  68     if (!resolutions) {
  69         free(reply);
  70         return;
  71     }
  72     xr_resolutions = resolutions;
  73     xr_screens = screens;
  74
  75     for (int screen = 0; screen < xr_screens; screen++) {
  76         xr_resolutions[screen].x = screen_info[screen].x_org;
  77         xr_resolutions[screen].y = screen_info[screen].y_org;
  78         xr_resolutions[screen].width = screen_info[screen].width;
  79         xr_resolutions[screen].height = screen_info[screen].height;
  80         printf("found Xinerama screen: %d x %d at %d x %d\n",
  81                         screen_info[screen].width, screen_info[screen].height,
  82                         screen_info[screen].x_org, screen_info[screen].y_org);
  83     }
  84
  85     free(reply);
  86 }