sclass ScaledBWImageCache extends Meta is WidthAndHeight {
  int w, h;
  IPosterizer posterizer;
  
  *(int *w, int *h, int grayscaleLevels) {
    posterizer = new SinglePixelPosterizer(grayscaleLevels);
  }
  
  *(int *w, int *h, IPosterizer *posterizer) {
  }
  
  public int getWidth() { ret w; }
  public int getHeight() { ret h; }
}