extern boost::shared_ptr<dcp::CertificateChain> read_swaroop_chain (boost::filesystem::path path);
extern void write_swaroop_chain (boost::shared_ptr<const dcp::CertificateChain> chain, boost::filesystem::path output);
#endif
+extern dcp::Size scale_for_display (dcp::Size s, dcp::Size display_container, dcp::Size film_container);
template <class T>
std::list<T>