VisualBell()
VisualBell(void)
VisualBell(){    register TScreen *screen = &term->screen;    register Pixel xorPixel = screen->foreground ^ term->core.background_pixel;    XGCValues gcval;    GC visualGC;    gcval.function = GXxor;    gcval.foreground = xorPixel;    visualGC = XtGetGC((Widget)term, GCFunction+GCForeground, &gcval);#if OPT_TEK4014    if(screen->TekEmu) {	XFillRectangle(		       screen->display,		       TWindow(screen),		       visualGC,		       0, 0,		       (unsigned) TFullWidth(screen),		       (unsigned) TFullHeight(screen));	XFlush(screen->display);	XFillRectangle(		       screen->display,		       TWindow(screen),		       visualGC,		       0, 0,		       (unsigned) TFullWidth(screen),		       (unsigned) TFullHeight(screen));    } else#endif    {	XFillRectangle(		       screen->display,		       VWindow(screen),		       visualGC,		       0, 0,		       (unsigned) FullWidth(screen),		       (unsigned) FullHeight(screen));	XFlush(screen->display);	XFillRectangle(		       screen->display,		       VWindow(screen),		       visualGC,		       0, 0,		       (unsigned) FullWidth(screen),		       (unsigned) FullHeight(screen));    }}