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 /*

  #

  #  File        : fade_images.cpp

  #                ( C++ source file )

  #

  #  Description : Compute a linear fading between two images.

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

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

  #

  #  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.

  #

 */

 #include "CImg.h"

 // The lines below are necessary when using a non-standard compiler as visualcpp6.

 #ifdef cimg_use_visualcpp6

 #define std

 #endif

 #ifdef min

 #undef min

 #undef max

 #endif

 #ifndef cimg_imagepath

 #define cimg_imagepath "img/"

 #endif

 // Main procedure

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

 int main(int argc,char **argv) {

   // Read and check command line parameters

   cimg_usage("Compute a linear fading between two 2D images");

   const char *file_i1 = cimg_option("-i1",cimg_imagepath "sh0r.pgm","Input Image 1");

   const char *file_i2 = cimg_option("-i2",cimg_imagepath "milla.bmp","Input Image 2");

   const char *file_o  = cimg_option("-o",(char*)0,"Output Image");

   const bool visu     = cimg_option("-visu",true,"Visualization mode");

   const double pmin   = cimg_option("-min",40.0,"Begin of the fade (in %)")/100.0;

   const double pmax   = cimg_option("-max",60.0,"End of the fade (in %)")/100.0;

   const double angle  = cimg_option("-angle",0.0,"Fade angle")*cimg_library::cimg::valuePI/180;

   // Init images

   cimg_library::CImg<unsigned char> img1(file_i1), img2(file_i2);

   if (img2.dimx()!=img1.dimx() || img2.dimy()!=img1.dimy() || img2.dimz()!=img1.dimz() || img2.dimv()!=img1.dimv()) {

     int

       dx = cimg_library::cimg::max(img1.dimx(),img2.dimx()),

       dy = cimg_library::cimg::max(img1.dimy(),img2.dimy()),

       dz = cimg_library::cimg::max(img1.dimz(),img2.dimz()),

       dv = cimg_library::cimg::max(img1.dimv(),img2.dimv());

     img1.resize(dx,dy,dz,dv,3);

     img2.resize(dx,dy,dz,dv,3);

   }

   cimg_library::CImg<unsigned char> dest(img1.dimx(),img1.dimy(),img1.dimz(),img1.dimv());

   // Compute the faded image

   const double ca=std::cos(angle), sa=std::sin(angle);

   double alpha;

   cimg_forXYZV(dest,x,y,z,k) {

     const double X = ((double)x/img1.dimx()-0.5)*ca + ((double)y/img1.dimy()-0.5)*sa;

     if (X+0.5<pmin) alpha=0; else {

       if (X+0.5>pmax) alpha=1; else alpha=(X+0.5-pmin)/(pmax-pmin);

     }

     dest(x,y,z,k) = (unsigned char)((1-alpha)*img1(x,y,z,k) + alpha*img2(x,y,z,k));

   }

   // Save and exit

   if (file_o) dest.save(file_o);

   if (visu) dest.display("Image fading");

   return 0;

 }