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 /*

  #

  #  File        : use_RGBclass.cpp

  #                ( C++ source file )

  #

  #  Description : A small code that shows how to write a CImg plugin to

  #                handle color image manipulation using a user-defined RGB

  #                class, instead of using classical pixel access of CImg<T>

  #                with operator().

  #                This file is a part of the CImg Library project.

  #                ( http://cimg.sourceforge.net )

  #

  #  Note        : This file cannot be compiled on VC++ 6.

  #

  #  Copyright   : David Tschumperle

  #                ( http://www.greyc.ensicaen.fr/~dtschump/ )

  #

  #  License     : CeCILL v2.0

  #                ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )

  #

  #  This software is governed by the CeCILL  license under French law and

  #  abiding by the rules of distribution of free software.  You can  use,

  #  modify and/ or redistribute the software under the terms of the CeCILL

  #  license as circulated by CEA, CNRS and INRIA at the following URL

  #  "http://www.cecill.info".

  #

  #  As a counterpart to the access to the source code and rights to copy,

  #  modify and redistribute granted by the license, users are provided only

  #  with a limited warranty  and the software's author,  the holder of the

  #  economic rights,  and the successive licensors  have only  limited

  #  liability.

  #

  #  In this respect, the user's attention is drawn to the risks associated

  #  with loading,  using,  modifying and/or developing or reproducing the

  #  software by the user in light of its specific status of free software,

  #  that may mean  that it is complicated to manipulate,  and  that  also

  #  therefore means  that it is reserved for developers  and  experienced

  #  professionals having in-depth computer knowledge. Users are therefore

  #  encouraged to load and test the software's suitability as regards their

  #  requirements in conditions enabling the security of their systems and/or

  #  data to be ensured and,  more generally, to use and operate it in the

  #  same conditions as regards security.

  #

  #  The fact that you are presently reading this means that you have had

  #  knowledge of the CeCILL license and that you accept its terms.

  #

 */

 #ifndef cimg_plugin

 #define cimg_plugin "examples/use_RGBclass.cpp"  // Path of the plugin is relative to the CImg.h file.

 #include "CImg.h"

 using namespace cimg_library;

 #ifndef cimg_imagepath

 #define cimg_imagepath "img/"

 #endif

 //----------------

 // Main procedure

 //----------------

 int main() {

   // Load images.

   CImg<short> img1(cimg_imagepath "milla.bmp");

   const CImg<float> img2 = CImg<float>(cimg_imagepath "lena.pgm").resize(img1,3);

   const float default_color[] = { 30,30,80 };

   // Modify 'img1' using the RGB pixel accessor.

   cimg_forXY(img1,x,y)

     if (!((x*y)%31)) img1.RGB_at(x,y) = default_color;

     else if ((x+y)%2) img1.RGB_at(x,y) = img2.RGB_at(x,y);

   img1.display();

   // Quit.

   return 0;

 }

 #else

 //-------------------------

 // Start of the plugin code

 //-------------------------

 // Define a simple structure of *references* to R,G,B values.

 //-----------------------------------------------------------

 // (Feel free to add your own operators in there !)

 struct st_RGB {

   T _R,_G,_B,&R,&G,&B;

   // Construct from R,G,B references of values.

   st_RGB(const T& nR, const T& nG, const T& nB):_R(nR),_G(nG),_B(nB),R(_R),G(_G),B(_B) {}

   st_RGB(T& nR, T& nG, T& nB):R(nR),G(nG),B(nB) {}

   // Copy constructors.

   st_RGB(const st_RGB& rgb):_R(rgb.R),_G(rgb.G),_B(rgb.B),R(_R),G(_G),B(_B) {}

   template<typename t>

   st_RGB(const t& rgb):_R(rgb[0]),_G(rgb[1]),_B(rgb[2]) {}

   // Assignement operator.

   st_RGB& operator=(const st_RGB& rgb) {

     R = (T)(rgb[0]); G = (T)(rgb[1]); B = (T)(rgb[2]);

     return *this;

   }

   template<typename t>

   st_RGB& operator=(const t& rgb) {

     R = (T)(rgb[0]); G = (T)(rgb[1]); B = (T)(rgb[2]);

     return *this;

   }

   // Data (R,G or B) access operator.

   const T& operator[](const unsigned int i) const {

     return i==2?B:(i==1?G:R);

   }

   T& operator[](const unsigned int i) {

     return i==2?B:(i==1?G:R);

   }

   // Print instance on the standard error.

   const st_RGB& print() const {

     std::fprintf(stderr,"{ %d %d %d }\n",(int)R,(int)G,(int)B);

     return *this;

   }

 };

 // Define CImg<T> member functions which return pixel values as st_RGB instances.

 //--------------------------------------------------------------------------------

 const st_RGB RGB_at(const int x, const int y=0, const int z=0) const {

   const long whz = width*height*depth;

   const T *const pR = data + x + y*width + z*width*height, *const pG = pR + whz, *const pB = pG + whz;

   return st_RGB(*pR,*pG,*pB);

 }

 st_RGB RGB_at(const int x, const int y=0, const int z=0) {

   const long whz = width*height*depth;

   T *const pR = data + x + y*width + z*width*height, *const pG = pR + whz, *const pB = pG + whz;

   return st_RGB(*pR,*pG,*pB);

 }

 //------------------------

 // End of the plugin code

 //------------------------

 #endif