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abstract sclass DynImageSurface extends DynModule {
  transient ImageSurface imageSurface;
  transient BufferedImage image;

  visualize {
    ret jscroll_center(imageSurface = imageSurface(image));
  }
  
  // API
  
  void setImage(MakesBufferedImage image) { setImage(image == null ? null : image.getBufferedImage()); }
  void setImage(BufferedImage image) { this.image = image; if (imageSurface != null) imageSurface.setImage(image); }
  
  BufferedImage getImage() { ret image; }
  bool hasImage() { ret image != null; }
}