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 "i3lock.h"
  17 #include "xcb.h"
  18 #include "xinerama.h"
  19
  20 /* Number of Xinerama screens which are currently present. */
  21 int xr_screens = 0;
  22
  23 /* The resolutions of the currently present Xinerama screens. */
  24 Rect *xr_resolutions;
  25
  26 static bool xinerama_active;
  27 extern bool debug_mode;
  28
  29 void xinerama_init(void) {
  30     if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
  31         DEBUG("Xinerama extension not found, disabling.\n");
  32         return;
  33     }
  34
  35     xcb_xinerama_is_active_cookie_t cookie;
  36     xcb_xinerama_is_active_reply_t *reply;
  37
  38     cookie = xcb_xinerama_is_active(conn);
  39     reply = xcb_xinerama_is_active_reply(conn, cookie, NULL);
  40     if (!reply)
  41         return;
  42
  43     if (!reply->state) {
  44         free(reply);
  45         return;
  46     }
  47
  48     xinerama_active = true;
  49 }
  50
  51 void xinerama_query_screens(void) {
  52     if (!xinerama_active)
  53         return;
  54
  55     xcb_xinerama_query_screens_cookie_t cookie;
  56     xcb_xinerama_query_screens_reply_t *reply;
  57     xcb_xinerama_screen_info_t *screen_info;
  58
  59     cookie = xcb_xinerama_query_screens_unchecked(conn);
  60     reply = xcb_xinerama_query_screens_reply(conn, cookie, NULL);
  61     if (!reply) {
  62         if (debug_mode)
  63             fprintf(stderr, "Couldn't get Xinerama screens\n");
  64         return;
  65     }
  66     screen_info = xcb_xinerama_query_screens_screen_info(reply);
  67     int screens = xcb_xinerama_query_screens_screen_info_length(reply);
  68
  69     Rect *resolutions = malloc(screens * sizeof(Rect));
  70     /* No memory? Just keep on using the old information. */
  71     if (!resolutions) {
  72         free(reply);
  73         return;
  74     }
  75     xr_resolutions = resolutions;
  76     xr_screens = screens;
  77
  78     for (int screen = 0; screen < xr_screens; screen++) {
  79         xr_resolutions[screen].x = screen_info[screen].x_org;
  80         xr_resolutions[screen].y = screen_info[screen].y_org;
  81         xr_resolutions[screen].width = screen_info[screen].width;
  82         xr_resolutions[screen].height = screen_info[screen].height;
  83         DEBUG("found Xinerama screen: %d x %d at %d x %d\n",
  84                         screen_info[screen].width, screen_info[screen].height,
  85                         screen_info[screen].x_org, screen_info[screen].y_org);
  86     }
  87
  88     free(reply);
  89 }