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// edit source code from:
// https://github.com/gvalkov/xrectsel
//#include <stdio.h>
#include <X11/Xlib.h>
//int main (int argc, char *argv[])
int main (void)
{
// useless trash vars
int int_tmp;
unsigned int uint_tmp;
Window window_tmp;
int rootx, rooty;
Display * disp = XOpenDisplay(NULL);
Screen * scr = ScreenOfDisplay(disp, DefaultScreen(disp));
Window root = RootWindow(disp, XScreenNumberOfScreen(scr));
// not completely understood
XGCValues gcval;
gcval.foreground = XWhitePixel(disp, 0);
gcval.function = GXxor;
gcval.background = XBlackPixel(disp, 0);
gcval.plane_mask = gcval.background ^ gcval.foreground;
gcval.subwindow_mode = IncludeInferiors;
GC gc = XCreateGC(disp, root, GCFunction|GCForeground|GCBackground|GCSubwindowMode, &gcval);
XQueryPointer(disp, root, &window_tmp, &window_tmp, &rootx, &rooty, &int_tmp, &int_tmp, &uint_tmp);
//printf("pointer coordinates x: %d, y: %d\n", rootx, rooty);
//printf("screen width: %d, height: %d\n", scr->width, scr->height);
XDrawLine(disp, root, gc, rootx, 0, rootx, scr->height);
XDrawLine(disp, root, gc, 0, rooty, scr->width, rooty);
// not completely understood
XFlush(disp);
XFreeGC(disp, gc);
XSync(disp, True);
// man XCloseDisplay says: "Before exiting, you should call XCloseDisplay explicitly so that any pending errors are reported as XCloseDisplay performs a final XSync operation."
XCloseDisplay(disp);
return 0;
}
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