extern size_t utf8_strlen (std::string s);
extern std::string day_of_week_to_string (boost::gregorian::greg_weekday d);
extern void emit_subtitle_image (dcpomatic::ContentTimePeriod period, dcp::SubtitleImage sub, dcp::Size size, boost::shared_ptr<TextDecoder> decoder);
extern size_t utf8_strlen (std::string s);
extern std::string day_of_week_to_string (boost::gregorian::greg_weekday d);
extern void emit_subtitle_image (dcpomatic::ContentTimePeriod period, dcp::SubtitleImage sub, dcp::Size size, boost::shared_ptr<TextDecoder> decoder);