void emit_bitmap (dcpomatic::ContentTimePeriod period, std::shared_ptr<const Image> image, dcpomatic::Rect<double> rect);
void emit_plain_start (dcpomatic::ContentTime from, std::list<dcp::SubtitleString> s);
void emit_plain_start (dcpomatic::ContentTime from, sub::Subtitle const & subtitle);
void emit_bitmap (dcpomatic::ContentTimePeriod period, std::shared_ptr<const Image> image, dcpomatic::Rect<double> rect);
void emit_plain_start (dcpomatic::ContentTime from, std::list<dcp::SubtitleString> s);
void emit_plain_start (dcpomatic::ContentTime from, sub::Subtitle const & subtitle);