text: #ifndef CQGnuPlotPNGRenderer_H
  #define CQGnuPlotPNGRenderer_H
  
  #include <CQGnuPlotRenderer.h>
  #include <QSize>
  
  class CQGnuPlotPNGDevice;
  
  class CQGnuPlotPNGRenderer : public CQGnuPlotRenderer {
   public:
    CQGnuPlotPNGRenderer(CQGnuPlotPNGDevice *device);
   ~CQGnuPlotPNGRenderer() override;
  
    void setOutputSize(const QSize &size);
  
   private:
    CQGnuPlotPNGDevice *device_;
  };
  
  #endif
  