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// A is the user object associated with each mask (aka a "label")
sclass G22MasksHolder<A> {
  record Mask(Image2B image, A label) {
  }

  settable WidthAndHeight maskSize;
  new L<Mask> masks;

  {
    maskSize(16);
  }
  
  selfType maskSize(int size) {
    ret maskSize(widthAndHeight(size));
  }
  
  Image2B regionToMaskImage(IImageRegion region) {
    ret scaledIBinaryImage(maskSize, regionToIBinaryImage(region));
  }
  
  void addRegion(IImageRegion region, A label) {
    masks.add(new Mask(regionToMaskImage(region), label));
  }
}