Function lodepng::ffi::lodepng_decode_file

#[no_mangle]
pub unsafe extern "C" fn lodepng_decode_file(
    out: &mut *mut u8, 
    w_out: &mut c_uint, 
    h_out: &mut c_uint, 
    filename: *const i8, 
    colortype: ColorType, 
    bitdepth: c_uint
) -> Error