rem: return ((c - orgc) << ZOOM_SHIFT) / reduction;
add: if (optMeleeScale == TFB_SCALE_STEP) {	 return (c - orgc) >> reduction; } else {	 return ((c - orgc) << ZOOM_SHIFT) / reduction; }
context: CalcDisplayCoord (COORD c, COORD orgc, SIZE reduction){	return ((c - orgc) << ZOOM_SHIFT) / reduction;}