static Map<S, BufferedImage> loadImage2_cached_cache = synchroTreeMap();

// s = snippetIDOrURL
static BufferedImage loadImage2_cached(String s) {
  BufferedImage img = loadImage2_cached_cache.get(s);
  if (img == null)
    loadImage2_cached_cache.put(s, img = loadBufferedImage(s));
  ret img;
}