+ // Determine whether we must apply per-class filtering or not
+ bool all_ann_classes_enabled = true;
+ bool all_ann_classes_disabled = true;
+
+ uint32_t max_ann_class_id = 0;
+ for (AnnotationClass* c : row_->ann_classes()) {
+ if (!c->visible)
+ all_ann_classes_enabled = false;
+ else
+ all_ann_classes_disabled = false;
+ if (c->id > max_ann_class_id)
+ max_ann_class_id = c->id;
+ }
+
+ if (all_ann_classes_enabled) {
+ // No filtering, send everyting out as-is
+ dest.reserve(dest.size() + annotations_.size());
+ for (const auto& annotation : annotations_)
+ if ((annotation.end_sample() > start_sample) &&
+ (annotation.start_sample() <= end_sample))
+ dest.push_back(&annotation);
+ } else {
+ if (!all_ann_classes_disabled) {
+ // Filter out invisible annotation classes
+ vector<size_t> class_visible;
+ class_visible.resize(max_ann_class_id + 1, 0);
+ for (AnnotationClass* c : row_->ann_classes())
+ if (c->visible)
+ class_visible[c->id] = 1;
+
+ dest.reserve(dest.size() + annotations_.size());
+ for (const auto& annotation : annotations_)
+ if ((class_visible[annotation.ann_class()]) &&
+ (annotation.end_sample() > start_sample) &&
+ (annotation.start_sample() <= end_sample))
+ dest.push_back(&annotation);
+ }
+ }