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/*
* screeninfo-xinerama.c
*
* Copyright (C) 2008, Octavio Alvarez Piza.
* License: GNU General Public License v2.
*
*/
#include <malloc.h>
#include <string.h>
#include <stdio.h>
#include <X11/extensions/Xinerama.h>
#include <X11/Xlib.h>
#include "debug.h"
#include "screeninfo.h"
void screeninfo_get_screens(Display *dpy, screeninfo_t **screens, int *screens_n) {
XineramaScreenInfo *xinerama_screens=NULL;
int xinerama_screens_n=0;
Bool xinerama_queryextension_result;
Status xinerama_queryversion_result;
Bool xinerama_is_active;
int dummyint;
xinerama_queryextension_result = XineramaQueryExtension (dpy, &dummyint, &dummyint);
xinerama_queryversion_result = XineramaQueryVersion (dpy, &dummyint, &dummyint);
xinerama_is_active = XineramaIsActive(dpy);
if (xinerama_queryextension_result != True
|| xinerama_queryversion_result == 0
|| xinerama_is_active != True)
{
fprintf(stderr, "superkb: Xinerama extension not available! Falling back.\n");
*screens = (screeninfo_t *) malloc(sizeof(screeninfo_t));
*screens_n = 1;
screens[0]->screen_number = 0;
screens[0]->x_org = 0;
screens[0]->y_org = 0;
screens[0]->width = DisplayWidth(dpy, DefaultScreen(dpy));
screens[0]->height = DisplayHeight(dpy, DefaultScreen(dpy));
return;
}
xinerama_screens = XineramaQueryScreens (dpy, &xinerama_screens_n);
if (xinerama_screens_n == 0) {
fprintf(stderr, "superkb: Xinerama extension available, but query failed! Falling back.\n");
*screens = (screeninfo_t *) malloc(sizeof(screeninfo_t));
*screens_n = 1;
screens[0]->screen_number = 0;
screens[0]->x_org = 0;
screens[0]->y_org = 0;
screens[0]->width = DisplayWidth(dpy, DefaultScreen(dpy));
screens[0]->height = DisplayHeight(dpy, DefaultScreen(dpy));
return;
}
/* Everything went well */
debug(3, "[xs] Xinerama detected %d screens.\n", xinerama_screens_n);
int i;
for (i=0; i < xinerama_screens_n; i++) {
#define xsi ((xinerama_screens)[i])
debug (4, "[xs] Screen #%d: number=%d, x=%d, y=%d, w=%d, h=%d\n",
i, xsi.screen_number, xsi.x_org, xsi.y_org, xsi.width, xsi.height);
#undef xsi
}
/* We should dump all information from Xinerama to screeninfo. However,
* given the struct is the same (intentionally) we are going to simply
* memcpy() it. If the structure ever changes, this code should be
* definitely updated.
*/
*screens = malloc(sizeof(screeninfo_t)*xinerama_screens_n);
memcpy(*screens, xinerama_screens, sizeof(screeninfo_t)*xinerama_screens_n);
*screens_n = xinerama_screens_n;
}
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