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interface IImageRegion<Img extends WidthAndHeight> {
  // get whole image that the region refers to
  public default Img image() { null; }
  
  // which object made this
  public O creator();
  
  public default int indexInCreator() { ret 0; }
  
  // smallest rectangle that all of the region's pixels are contained in
  public Rect bounds();
  
  public int numberOfPixels();
  public Pt firstPixel();
  public Iterator<Pt> pixelIterator();
  public bool contains(int x, int y);
  
  // gets the region's color (what exactly this means is defined
  // by the crea)
  public RGB color();
}