static IBinaryImage iBinaryImageFromFunction(IIntIntPred f, int w, int h) {
  ret new IBinaryImage {
    public int getWidth() { ret w; }
    public int getHeight() { ret h; }
    
    public bool getBoolPixel(int x, int y) {
      ret f.get(x, y);
    }
  };
}

static IBinaryImage iBinaryImageFromFunction(int w, int h, IIntIntPred f) {
  ret iBinaryImageFromFunction(f, w, h);
}