+string
+marked_up (list<dcp::SubtitleString> subtitles)
+{
+ string out;
+ bool italic = false;
+ bool bold = false;
+ bool underline = false;
+ BOOST_FOREACH (dcp::SubtitleString const & i, subtitles) {
+
+ if (i.italic() && !italic) {
+ out += "<i>";
+ }
+ if (i.bold() && !bold) {
+ out += "<b>";
+ }
+ if (i.underline() && !underline) {
+ out += "<u>";
+ }
+ if (!i.underline() && underline) {
+ out += "</u>";
+ }
+ if (!i.bold() && bold) {
+ out += "</b>";
+ }
+ if (!i.italic() && italic) {
+ out += "</i>";
+ }
+
+ italic = i.italic ();
+ bold = i.bold ();
+ underline = i.underline ();
+
+ out += i.text ();
+ }
+
+ if (underline) {
+ out += "</u>";
+ }
+ if (bold) {
+ out += "</b>";
+ }
+ if (italic) {
+ out += "</i>";
+ }
+
+ return out;
+}
+
+/** @param subtitles A list of subtitles that are all on the same line,
+ * at the same time and with the same fade in/out.
+ */