code: package freed.cam.previewpostprocessing;
  
  import android.graphics.SurfaceTexture;
  import android.view.View;
  
  import freed.cam.histogram.HistogramFeed;
  
  public interface Preview
  {
  
      interface PreviewEvent
      {
          void onPreviewAvailable(SurfaceTexture surface, int width, int height);
          void onPreviewSizeChanged(SurfaceTexture surface, int width, int height);
          boolean onPreviewDestroyed(SurfaceTexture surface);
          void onPreviewUpdated(SurfaceTexture surface);
      }
      SurfaceTexture getSurfaceTexture();
      void setSize(int width, int height);
      void setBlue(boolean blue);
      void setRed(boolean red);
      void setGreen(boolean green);
      void setFocusPeak(boolean on);
      boolean isFocusPeak();
      void setClipping(boolean on);
      boolean isClipping();
      void setHistogram(boolean on);
      boolean isHistogram();
      void setColorWaveForm(boolean on);
      boolean isColorWaveForm();
      void start();
      void stop();
      View getPreviewView();
      void setPreviewEventListner(PreviewEvent eventListner);
      int getViewWidth();
      int getViewHeight();
      int getPreviewWidth();
      int getPreviewHeight();
      void setRotation(int width, int height,int rotation);
      void setHistogramFeed(HistogramFeed feed);
      void clear();
      void setZebraHigh(float high);
      void setZebraLow(float low);
  }
  