asclass DynWebCamAnalyzer > DynImageSurfaceAndEnabled {
  switchable bool overlay;
  
  transient ReliableSingleThread rstUpdateImage = dm_rst(this, r updateImage);
  transient long analysisTime = -1; // ns for analysis
  transient S info;
  transient JLabel lblInfo;
  
  transient BufferedImage inputImage;
  transient int w, h; // will be set to width & height of inputImage

  start-thread {
    doEvery(100, rstUpdateImage);
  }

  afterVisualize {
    imageSurface_pixelated(imageSurface);
    containerAddFirst(buttons,
      lblInfo = dm_label info(),
      dm_checkBox('overlay));
  }
  
  void updateImage enter {
    if (imageSurface == null || !enabled) ret;
    BufferedImage img = dm_webCamImage();
    temp tempAfterwards(r { inputImage = img });
    if (img == null || img == inputImage) ret;
    w = img.getWidth();
    h = img.getHeight();
    
    long time = nanoTime();
    pcall { analyzeImage(); }
    analysisTime = nanoTime()-time;
    
    BufferedImage img2 = img;
    if (overlay)
      pcall { drawOverlays(img2 = cloneBufferedImage(img)); }
    setImage(img2);
  }
  
  // overlord me, uh, i mean, overload me
  // can use inputImage, w, h and setInfo
  void analyzeImage() {
  }
  
  // overlooooad me if you want
  void drawOverlays(BufferedImage img) {
  }
  
  void setInfo(S info) {
    setField(+info);
  }
}