#include <stdlib.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <limits.h>
#include <unistd.h>

#define W (unsigned)

Display *d;

static long
colour (char r, char g, char b)
{
    long c = 0;
    char *colour = (char*) &c;

    colour[0]=b;
    colour[1]=g;
    colour[2]=r;

    return c;
}

static void
test (Window a, Window b)
{
    Window root, child;
    int rx, ry, x, y;
    unsigned mask;

    fprintf(stderr,"a:0x%x b:0x%x\n",(unsigned)a,(unsigned)b);

    XQueryPointer (d, a, &root, &child, &rx, &ry, &x, &y, &mask);
    fprintf(stderr,"query - root: (%d, %d) a: (%d %d)\n", rx, ry, x, y);
    
    XTranslateCoordinates(d, a, b, x, y, &rx, &ry, &child);
    fprintf(stderr,"trans - b: (%d, %d) a: (%d %d)\n", rx, ry, x, y);

    fprintf(stderr,"\n");
}

int
main (int argc, char **argv)
{
    d = XOpenDisplay(NULL);
	if(!d) return 1;
    Window w1 = XCreateSimpleWindow(d, RootWindow(d, 0),
                                   100, 100, 400, 400, 0, 0, colour(255,0,0));
    Window w2 = XCreateSimpleWindow(d, w1,
                                   0, 0, 64, 64, 0, 0, colour(99,0,99));
    Window w3 = XCreateSimpleWindow(d, w1,
                                   400-64, 400-64, 64, 64, 0, 0, colour(99,0,99));

    XSelectInput (d, w1, ButtonPressMask | ButtonReleaseMask);
    XSelectInput (d, w2, ButtonPressMask | ButtonReleaseMask);
    XSelectInput (d, w3, ButtonPressMask | ButtonReleaseMask);

    XMapWindow (d, w2);
    XMapWindow (d, w3);
    XMapWindow (d, w1);

    XFlush (d);

    while(1)
    {
	XEvent ev;
	XNextEvent(d, &ev);
	
	switch (ev.type) {
	case ButtonPress:
	{
	    fprintf(stderr,"ButtonPress:\n");
            fprintf(stderr,"  event - root: (%d, %d) a: (%d %d) w: 0x%x c: 0x%x\n",
                    ev.xbutton.x_root, ev.xbutton.y_root, ev.xbutton.x, ev.xbutton.y,W ev.xbutton.window,W ev.xbutton.subwindow);
Window root, child;
int x, y, rx, ry, tx, ty;
unsigned int mask;
XQueryPointer (d, w1, &root, &child, &rx, &ry, &x, &y, &mask);
fprintf(stderr,"  query - root: (%d, %d) a: (%d %d) w: 0x%x c: 0x%x\n", rx, ry, x, y, W w1, W child);
XTranslateCoordinates(d, w1, root, x, y, &tx, &ty, &child);
XTranslateCoordinates(d, root, w1, rx, ry, &x, &y, &child);
fprintf(stderr,"  trans - root: (%d, %d) a: (%d %d) w: 0x%x c: 0x%x\n\n", tx, ty, x, y, W w1, W child);
	}
	break;
	case ButtonRelease:
	{
	    fprintf(stderr,"ButtonRelease:\n");
            fprintf(stderr,"  event - root: (%d, %d) a: (%d %d) w: 0x%x c: 0x%x\n",
                    ev.xbutton.x_root, ev.xbutton.y_root, ev.xbutton.x, ev.xbutton.y,W ev.xbutton.window,W ev.xbutton.subwindow);
Window root, child;
int x, y, rx, ry, tx, ty;
unsigned int mask;
XQueryPointer (d, w1, &root, &child, &rx, &ry, &x, &y, &mask);
fprintf(stderr,"  query - root: (%d, %d) a: (%d %d) w: 0x%x c: 0x%x\n", rx, ry, x, y, W w1, W child);
XTranslateCoordinates(d, w1, root, x, y, &tx, &ty, &child);
XTranslateCoordinates(d, root, w1, rx, ry, &x, &y, &child);
fprintf(stderr,"  trans - root: (%d, %d) a: (%d %d) w: 0x%x c: 0x%x\n\n", tx, ty, x, y, W w1, W child);
	}
	break;
	default:
	break;
	}
    }
}