void
x_real_positions (f, xptr, yptr)
     FRAME_PTR f;
     int *xptr, *yptr;
{
  int win_x, win_y, outer_x, outer_y;
  int real_x = 0, real_y = 0;
  int had_errors = 0;
  Window win = f->output_data.x->parent_desc;

  int count;

  BLOCK_INPUT;

  count = x_catch_errors (FRAME_X_DISPLAY (f));
  
  if (win == FRAME_X_DISPLAY_INFO (f)->root_window)
    win = FRAME_OUTER_WINDOW (f);
      
  for (;;)
    {
      Window wm_window, rootw;
      Window *tmp_children;
      unsigned int tmp_nchildren;

      XQueryTree (FRAME_X_DISPLAY (f), win, &rootw,
                  &wm_window, &tmp_children, &tmp_nchildren);
      XFree ((char *) tmp_children);

      had_errors = x_had_errors_p (FRAME_X_DISPLAY (f));

      if (wm_window == rootw || had_errors)
        break;

      win = wm_window;
    }
    
  if (! had_errors)
    {
      int ign;
      Window child, rootw;
          
      XGetGeometry (FRAME_X_DISPLAY (f), win,
                    &rootw, &real_x, &real_y, &ign, &ign, &ign, &ign);

      XTranslateCoordinates (FRAME_X_DISPLAY (f),

			     /* From-window, to-window.  */
			     FRAME_X_DISPLAY_INFO (f)->root_window,
                             FRAME_X_WINDOW (f),

			     /* From-position, to-position.  */
                             real_x, real_y, &win_x, &win_y,

			     /* Child of win.  */
			     &child);

      if (FRAME_X_WINDOW (f) == FRAME_OUTER_WINDOW (f))
	{
          outer_x = win_x;
          outer_y = win_y;
	}
      else
        {
          XTranslateCoordinates (FRAME_X_DISPLAY (f),

                                 /* From-window, to-window.  */
                                 FRAME_X_DISPLAY_INFO (f)->root_window,
                                 FRAME_OUTER_WINDOW (f),
                                     
                                 /* From-position, to-position.  */
                                 real_x, real_y, &outer_x, &outer_y,
                         
                                 /* Child of win.  */
                                 &child);
    }

      had_errors = x_had_errors_p (FRAME_X_DISPLAY (f));
    }
      
  x_uncatch_errors (FRAME_X_DISPLAY (f), count);
      
  UNBLOCK_INPUT;

  if (had_errors) return;
      
  f->output_data.x->x_pixels_diff = -win_x;
  f->output_data.x->y_pixels_diff = -win_y;
  f->output_data.x->x_pixels_outer_diff = -outer_x;
  f->output_data.x->y_pixels_outer_diff = -outer_y;

  *xptr = real_x;
  *yptr = real_y;
}