sclass SSIListFrame > MetaWithChangeListeners is ByteIO, MakesBufferedImage {
  settable int magicMarker = 0xFFFFBABE;
  settableWithVar long timestampInMS;
  settableWithVar new WidthAndHeightImpl resolution;
  settableWithVar new SSIList content;
  
  public void readWrite(ByteHead head) {
    head.exchangeInt(magicMarker);
    head.exchangeLong(varTimestampInMS());
    head.exchange(resolution);
    head.exchangeWithSize(content);
  }
 
  public int getWidth() { ret resolution.w(); }
  public int getHeight() { ret resolution.h(); }
  public BufferedImage getBufferedImage aka render() {
    ret content.render(resolution);
  }
}