// blur.cpp : Floute une image en niveau de gris

#include <stdio.h>
#include "image_ppm.h"

int main(int argc, char* argv[])
{
  char cNomImgLue[250], cNomImgEcrite[250];
  int nH, nW, nTaille;
  int som;
  if (argc != 3) 
     {
       printf("Usage: ImageIn.pgm ImageOut.pgm \n"); 
       exit (1) ;
     }
   
   sscanf (argv[1],"%s",cNomImgLue) ;
   sscanf (argv[2],"%s",cNomImgEcrite);

   OCTET *ImgIn, *ImgOut;
   
   lire_nb_lignes_colonnes_image_pgm(cNomImgLue, &nH, &nW);
   nTaille = nH * nW;
  
   allocation_tableau(ImgIn, OCTET, nTaille);
   lire_image_pgm(cNomImgLue, ImgIn, nH * nW);
   allocation_tableau(ImgOut, OCTET, nTaille);
	
   for (int i=0; i < nTaille; i++)
    ImgOut[i]= ImgIn[i];

 for (int i=1; i < nH-1; i++)
   for (int j=1; j < nW-1; j++)
     {
		som=
		 ImgIn[(i-1)*nW+j-1]+ImgIn[(i-1)*nW+j]+ImgIn[(i-1)*nW+j+1]
		+ImgIn[i*nW+j-1]+ImgIn[i*nW+j]+ImgIn[i*nW+j+1]
		+ImgIn[(i+1)*nW+j-1]+ImgIn[(i+1)*nW+j]+ImgIn[(i+1)*nW+j+1];
		
       ImgOut[i*nW+j]=som/9;
     }

   ecrire_image_pgm(cNomImgEcrite, ImgOut,  nH, nW);
   free(ImgIn);free(ImgOut);
   return 1;
}