+list<dcpomatic::Rect<int>>
+bounding_box(list<StringText> subtitles, dcp::Size target, optional<dcp::SubtitleStandard> override_standard)
+{
+ list<StringText> pending;
+ list<dcpomatic::Rect<int>> rects;
+
+ auto use_pending = [&pending, &rects, target, override_standard]() {
+ auto const& subtitle = pending.front();
+ auto standard = override_standard.get_value_or(subtitle.valign_standard);
+ /* We can provide dummy values for time and frame rate here as they are only used to calculate fades */
+ auto layout = setup_layout(pending, target, DCPTime(), 24);
+ int const x = x_position(subtitle.h_align(), subtitle.h_position(), target.width, layout.size.width);
+ int const y = y_position(standard, subtitle.v_align(), subtitle.v_position(), target.height, layout.position.y, layout.size.height);
+ rects.push_back({Position<int>(x, y), layout.size.width, layout.size.height});
+ };
+
+ for (auto const& i: subtitles) {
+ if (!pending.empty() && (i.v_align() != pending.back().v_align() || fabs(i.v_position() - pending.back().v_position()) > 1e-4)) {
+ use_pending();
+ pending.clear();
+ }
+ pending.push_back(i);
+ }
+
+ if (!pending.empty()) {
+ use_pending();
+ }
+
+ return rects;
+}
+
+