class GammaLUT;
class OpenJPEGImage;
-extern bool operator== (Size const & a, Size const & b);
-extern bool operator!= (Size const & a, Size const & b);
-extern std::ostream& operator<< (std::ostream& s, Size const & a);
-
extern std::string make_uuid ();
extern std::string make_digest (boost::filesystem::path filename, boost::function<void (float)>);
extern std::string content_kind_to_string (ContentKind kind);