+ case OverlapStart:
+
+ /* { ==== top ============ }
+ * [---- bottom -------------------]
+ */
+
+ if (_session.config.get_xfade_model() == FullCrossfade) {
+ touched_regions = regions_touched (top->first_frame(), bottom->last_frame());
+ if (touched_regions->size() <= 2) {
+ xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
+ add_crossfade (xfade);
+ }
+ } else {
+
+ touched_regions = regions_touched (top->first_frame(),
+ top->first_frame() + min ((nframes_t)_session.config.get_short_xfade_seconds() * _session.frame_rate(),
+ top->length()));
+ if (touched_regions->size() <= 2) {
+ xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
+ add_crossfade (xfade);
+ }
+ }
+ break;
+ case OverlapEnd:
+
+
+ /* [---- top ------------------------]
+ * { ==== bottom ============ }
+ */
+
+ if (_session.config.get_xfade_model() == FullCrossfade) {
+
+ touched_regions = regions_touched (bottom->first_frame(), top->last_frame());
+ if (touched_regions->size() <= 2) {
+ xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other,
+ _session.config.get_xfade_model(), _session.config.get_xfades_active()));
+ add_crossfade (xfade);
+ }
+
+ } else {
+ touched_regions = regions_touched (bottom->first_frame(),
+ bottom->first_frame() + min ((nframes_t)_session.config.get_short_xfade_seconds() * _session.frame_rate(),
+ bottom->length()));
+ if (touched_regions->size() <= 2) {
+ xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
+ add_crossfade (xfade);
+ }
+ }
+ break;