Function clipper_pathd_minkowski_diff 

pub unsafe extern "C" fn clipper_pathd_minkowski_diff(
    mem: *mut c_void,
    pattern: *mut ClipperPathD,
    path: *mut ClipperPathD,
    is_closed: c_int,
    precision: c_int,
) -> *mut ClipperPathsD

Decimal-coordinate version of clipper_path64_minkowski_diff. See clipper_pathd_minkowski_sum for the meaning of precision.