Es++ Sample: NonPhotorealisticRendering












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 *  NonPhotorealisticRendering.cpp
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// See: https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/photo/non_photorealistic_rendering/npr_demo.cpp

#include <es++/Pair.h>
#include <es++/gtkmm-3.0/Application.h>
#include <es++/gtkmm-3.0/Label.h>
#include <es++/gtkmm-3.0/LabeledTrackBar.h>
#include <es++/gtkmm-3.0/FileOpenDialog.h>
#include <es++/opencv-4.0/OpenCVMainView.h>
#include <es++/opencv-4.0/OpenCVScrolledImageView.h>
#include <es++/opencv-4.0/OpenCVScaleComboBox.h>

using namespace Gtk;

namespace Es {

class MainView :public Es::OpenCVMainView {
private:
  typedef enum {
     EdgePreserveSmoothingByNormalizedConvolutionFilter,
     EdgePreserveSmoothingByRecursiveFilter,
     DetailEnhancement,    
     MonochromePencilSketch, 
     ColorPencilSketch,
     Stylization,          
  } RendererType;
  
private:
  /////////////////////////////////////////////////////// 
  //Inner classes start.

  class OriginalImageView :public Es::OpenCVScrolledImageView {
  public:
    OriginalImageView()
    {
    }    
    void rescale(int scaling_ratio)
    {
      OpenCVScrolledImageView::scaleImage(scaling_ratio);
    }
  };

  class NonPhotorealisticView :public Es::OpenCVScrolledImageView {
  private:
    cv::Mat dest_image;

  public:
    NonPhotorealisticView()
    {
    }

    void loadImage(const std::string& filename, 
        int imageLoadingFlag= CV_LOAD_IMAGE_COLOR,
                int scaling_ratio=100)
    {
      OpenCVScrolledImageView::loadImage(filename, imageLoadingFlag,
                                scaling_ratio);
 
      cv::Mat& original_image = getOriginalImage();
      dest_image = original_image.clone();

      scaleImage(dest_image, scaling_ratio);
    }    

    void transform(int renderer_type, int scaling_ratio)
    {
      try {
        cv::Mat& original_image = getOriginalImage();

        switch(renderer_type) {
        case EdgePreserveSmoothingByNormalizedConvolutionFilter: {
          edgePreservingFilter(original_image, dest_image,1);
        }
        break;
        
        case EdgePreserveSmoothingByRecursiveFilter: {
          edgePreservingFilter(original_image, dest_image,2);

        }
        break;
        
        case DetailEnhancement: {
          cv::detailEnhance(original_image, dest_image);
        }
        break;
        
        case MonochromePencilSketch: {
          Mat img; 
          cv::pencilSketch(original_image, dest_image, img, 10 , 0.1f, 0.03f); 
        }
        break;

        case ColorPencilSketch: {
          Mat img; 
          cv::pencilSketch(original_image, img, dest_image, 10 , 0.1f, 0.03f); 
          
        }
        break;
        
        case Stylization: {
          stylization(original_image, dest_image);
        }
        break;
        
       default:
        break;
      }
 
        scaleImage(dest_image, scaling_ratio);
      } catch (cv::Exception& ex) {
        ; //
      }
    } 

    void rescale(int scaling_ratio)
    {
      OpenCVScrolledImageView::scaleImage(dest_image, scaling_ratio);
    }
  };
  // Inner classes end.
  /////////////////////////////////////////////////////// 

  Es::Label              filepath;

  Es::HorizontalLayout   horiz_layout;

  Es::VerticalLayout     control_pane;

  OriginalImageView      original_image;

  NonPhotorealisticView   nonPhotorealistic_image;

  int                    loading_flag;

  Es::OpenCVScaleComboBox scale_combobox;

  RendererType            renderer_type;
  
  Es::LabeledComboBox     renderer_type_combobox;

  int                     scaling_ratio;  //Percentage.
  static const int        CONTROLPANE_WIDTH = 220;

  std::string             filename;

  Es::FileOpenDialog      file_dialog;
 
public:
  //////////////////////////////////////////////
  //Constructor
  //
  MainView(Es::Application& applet, 
          std::string&      name,
          Es::Args&         args)
  :OpenCVMainView(applet, name, args)
  ,scaling_ratio(100)  //100%
  ,file_dialog(*this, Es::FileOpenDialog::IMAGE_FILES)
  {
    int w = (int)args.get(XmNwidth);
    int h = (int)args.get(XmNheight);

    int ratio = (int)args.get(XmNscalingRatio);

    scaling_ratio = OpenCVImageView::validateScale(ratio);

    Es::MainLayout& main_layout = get_main_layout();

    main_layout.pack_start(filepath, FALSE, FALSE, 0);

    main_layout.pack_start(horiz_layout);

    filename = "../../images/flower.png";

    filepath.set_label(filename);
    int ww = (w - CONTROLPANE_WIDTH)/2;

    filepath.set_size_request(w, 30);
    original_image.set_size_request(ww, h);
    nonPhotorealistic_image.set_size_request(ww, h);
    control_pane.set_size_request( CONTROLPANE_WIDTH, h);

    horiz_layout.pack_start(original_image);
    horiz_layout.pack_start(nonPhotorealistic_image);

    horiz_layout.pack_start(control_pane, FALSE, FALSE, 0);

    scale_combobox.set_selection(scaling_ratio);
    scale_combobox.set_changed_callback(
             sigc::mem_fun(*this, &MainView::scale_changed) );

    const char* renderer_types[] = {
        "EdgePreserve Smoothing By Normalized Convolution Filter",
        "EdgePreserve Smoothing By Recursive Filter",
        "Detail Enhancement",       
        "Monochrome Pencil Sketch",
        "Color Pencil Sketch",
        "Stylization"       
    };
    renderer_type = EdgePreserveSmoothingByNormalizedConvolutionFilter;
 
    renderer_type_combobox.set_label("RendererType");
    renderer_type_combobox.append_items(renderer_types, 
                 CountOf(renderer_types));
    renderer_type_combobox.set_active_text(renderer_types[0]);

    renderer_type_combobox.set_changed_callback(
           sigc::mem_fun(*this, &MainView::renderer_type_changed));

    control_pane.set_spacing(20);
    control_pane.pack_start(scale_combobox, Gtk::PACK_SHRINK);

    control_pane.pack_start(renderer_type_combobox, Gtk::PACK_SHRINK);

    loading_flag = IMREAD_COLOR;
    original_image.loadImage(filename, loading_flag, scaling_ratio);
    nonPhotorealistic_image.loadImage(filename, loading_flag, scaling_ratio);

    nonPhotorealistic_image.transform(renderer_type, 
               scaling_ratio);
    show_all();
  }

  void scale_changed()
  {
    std::string scale = scale_combobox.get_active_text();
    printf("scale_changed %s\n", scale.c_str());
    scaling_ratio = scale_combobox.get_selection();

    original_image.rescale(scaling_ratio);
    nonPhotorealistic_image.rescale(scaling_ratio);
  }


  void renderer_type_changed()
  {
    Es::Pair<int, const char*> types[] =  {
     {EdgePreserveSmoothingByNormalizedConvolutionFilter,
             "EdgePreserve Smoothing By Normalized Convolution Filter"},
     {EdgePreserveSmoothingByRecursiveFilter,
             "EdgePreserve Smoothing By Recursive Filter"},
     {DetailEnhancement,
             "Detail Enhancement"},
     {MonochromePencilSketch,
             "Monochrome Pencil Sketch"},
     {ColorPencilSketch,
             "Color Pencil Sketch"},
     {Stylization,
             "Stylization"},

    };
    std::string text = renderer_type_combobox.get_active_text();
    const char* item = text.c_str();
    for (size_t i = 0; i<CountOf(types); i++) {
     if (strcmp(types[i].second, item) == 0) {
        renderer_type = (RendererType)types[i].first;
        break;
     } 
    }
    printf("renderer_type %s\n", text.c_str());
    nonPhotorealistic_image.transform(renderer_type, 
               scaling_ratio);
  }

  void file_open()
  {
    int rc = file_dialog.popup();

    if (rc == Gtk::RESPONSE_OK) {
      const std::string filename = file_dialog.get_filename();

      filepath.set_label(filename);

      original_image.loadImage(filename, loading_flag, scaling_ratio);
      nonPhotorealistic_image.loadImage(filename, loading_flag, scaling_ratio);

      nonPhotorealistic_image.transform(renderer_type, 
               scaling_ratio);
    }
  }
};
}


int main(int argc, char** argv)
{
  Es::Environment env;

  try {
    std::string name = argv[0];

    Es::Application applet(argc, argv);

    Es::Args args;
    args.set(XmNx, 20);
    args.set(XmNy, 40);
    args.set(XmNwidth, 900);
    args.set(XmNheight, 400);
    args.set(XmNscalingRatio, 60); //60%
    Es::MainView mainv(applet, name, args);

    mainv.show();

    applet.run(mainv);

  } catch (Es::Exception& ex) {
    caught(ex);

  } catch (...) {
    printf("Get exception \n");
  }
  return 0;
}