Function vips_sys::im_greyc_mask

pub unsafe extern "C" fn im_greyc_mask(
    in_: *mut VipsImage, 
    out: *mut VipsImage, 
    mask: *mut VipsImage, 
    iterations: c_int, 
    amplitude: f32, 
    sharpness: f32, 
    anisotropy: f32, 
    alpha: f32, 
    sigma: f32, 
    dl: f32, 
    da: f32, 
    gauss_prec: f32, 
    interpolation: c_int, 
    fast_approx: c_int
) -> c_int