pub unsafe extern "C" fn graphene_euler_init_from_euler(
e: *mut graphene_euler_t,
src: *const graphene_euler_t,
) -> *mut graphene_euler_t
pub unsafe extern "C" fn graphene_euler_init_from_euler(
e: *mut graphene_euler_t,
src: *const graphene_euler_t,
) -> *mut graphene_euler_t