+ /* Gather all subtitles with the same time period that are next
+ on the list. We must emit all subtitles for the same time
+ period with the same emit*() call otherwise the
+ TextDecoder will assume there is nothing else at the
+ time of emitting the first.
+ */
+
+ vector<dcp::SubtitleString> s;
+ vector<dcp::SubtitleImage> i;
+ auto const p = content_time_period (*_next);
+
+ while (_next != _subtitles.end () && content_time_period (*_next) == p) {
+ auto ns = dynamic_pointer_cast<const dcp::SubtitleString>(*_next);
+ if (ns) {
+ s.push_back (*ns);
+ ++_next;
+ } else {
+ /* XXX: perhaps these image subs should also be collected together like the string ones are;
+ this would need to be done both here and in DCPDecoder.
+ */
+
+ auto ni = dynamic_pointer_cast<const dcp::SubtitleImage>(*_next);
+ if (ni) {
+ emit_subtitle_image (p, *ni, film()->frame_size(), only_text());
+ ++_next;
+ }
+ }
+ }
+
+ only_text()->emit_plain(p, s, _subtitle_standard);
+
+ update_position();