var_DelCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_filter->p_sys );
var_DelCallback( p_filter, FILTER_PREFIX "deciangle",
PreciseRotateCallback, p_filter->p_sys );
var_DelCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_filter->p_sys );
var_DelCallback( p_filter, FILTER_PREFIX "deciangle",
PreciseRotateCallback, p_filter->p_sys );