Function simplify_visvalingamp_ffi 

#[unsafe(no_mangle)]
pub extern "C" fn simplify_visvalingamp_ffi(
    coords: ExternalArray,
    precision: c_double,
) -> InternalArray

FFI wrapper for topology-preserving Visvalingam-Whyatt, returning simplified geometry coordinates.

Callers must pass two arguments:

• a Struct with two fields:
  • data, a void pointer to an array of floating-point point coordinates: [[1.0, 2.0], ...]
  • len, the length of the array being passed. Its type must be size_t
• a double-precision float for the epsilon

Implementations calling this function must call drop_float_array with the returned Array pointer, in order to free the memory it allocates.

Safety

This function is unsafe because it accesses a raw pointer which could contain arbitrary data