+
+ ArrayList<Indexable *> orig_idxbls; // originals which match the proxy assets
+ ArrayList<Indexable *> orig_proxies; // proxy assets
+ Asset *add_original(Indexable *idxbl, int new_scale);
+ ArrayList<Indexable *> needed_idxbls; // originals which match the needed_assets
+ ArrayList<Asset *> needed_proxies; // assets which must be created
+ void add_needed(Indexable *idxbl, Asset *proxy);
+
+ int create_needed_proxies(int new_scale);