Function libvips::bindings::vips_mask_gaussian_ring

pub unsafe extern "C" fn vips_mask_gaussian_ring(
    out: *mut *mut VipsImage, 
    width: c_int, 
    height: c_int, 
    frequency_cutoff: f64, 
    amplitude_cutoff: f64, 
    ringwidth: f64,
     ...
) -> c_int