int IsColonne(SDL_Surface *image,int x)
{
  Uint8 r;
  Uint8 g;
  Uint8 b;
  int res = 1;
  for(int y = 0; y<image->h-1;++y)
  {
    Uint32 p = (getpixel(image,(unsigned)x,(unsigned)y));
    SDL_GetRGB(p,image->format,&r,&g,&b);

    if( g == 0)
    {
      res = 0;
    }
  }
  return res;
}
//Test si la ligne  est totalement blanche
int IsLine(SDL_Surface *image, int y)
{ Uint8 r;
  Uint8 g;
  Uint8 b;
  int res = 1;
  for(int x = 0; x<image->w;++x)
  {
    Uint32 p = (getpixel(image,(unsigned)x,(unsigned)y));
    SDL_GetRGB(p,image->format,&r,&g,&b);

    if(b == 0)
    {
     res = 0;

    }
  }
  return res;
}

// Dessine une ligne autour des blocs (Pour mieux visualiser)
void LineMarker(SDL_Surface *image,int y)
{
  Uint8 r;
  Uint8 g;
  Uint8 b;
  for( int x = 0 ; x <image->w; ++x)
  {
    r = 255;
    g=1;
    b=1;
    putpixel(image,(unsigned)x,(unsigned)y,SDL_MapRGB(image->format,r,g,b));

  }
}
//Un truc qui marque les colonnes...En rouge, parce que c'est moche le rouge.
void ColumnMarker(SDL_Surface *image,int x)
{
  Uint8 r;
  Uint8 g;
  Uint8 b;
  for( int y = 0 ; y < image->h; ++y)
  {
    r = 255;
    g=1;
    b=1;
    putpixel(image,(unsigned)x,(unsigned)y,SDL_MapRGB(image->format,r,g,b));
  }

}



//Thx Vicky again ?!
void OnceAgainLine(SDL_Surface *image)
{
    for(int y = 0;y<image->h; ++y)
    {

      if(IsLine(image,y) == 0)
      {
        LineMarker(image,y);
        y = image->h -1;
      }
    }
    for(int y  = image->h -1; y>0;--y)
    {
      if(IsLine(image,y) == 0)
      {
        LineMarker(image,y);
        y = 0;
      }
    }
}
void OnceAgainColumn(SDL_Surface *image)
{
  for(int x = 0; x<image->w;++x)
  {
    if(IsColonne(image,x) == 0)
    {
      ColumnMarker(image,x);
      x = image->w-1;
    }

  }
  for(int x = image->w -1; x>0; --x)
  {
      if(IsColonne(image,x) == 0)
      {
        ColumnMarker(image,x);
        x = 0;
      }
  }
}



//Fonction qui-fait-tout
int BW(SDL_Surface *image)
{
  Uint8 r;
  Uint8 g;
  Uint8 b;
  for(int x = 0; x < image->w;x++)
  {
    for(int y = 0; y < image->h;y++)
    {
      Uint32 p = getpixel(image,(unsigned)x,(unsigned)y);
      SDL_GetRGB(p,image->format,&r,&g,&b);
      r= g = b =  (float)r * 0.3 + (float)g * 0.59 + (float)b * 0.11;
      int lim = 255/2;
      if(r>lim) { r = g = b =  255; }
      else{ r = g = b = 0;}
      putpixel(image,(unsigned)x,(unsigned)y,SDL_MapRGB(image->format,r,g,b));
    }

  }
  OnceAgainLine(image);
  OnceAgainColumn(image);
  image = display_image(image);
  SDL_FreeSurface(image);
  return 0;
}
//Vraiment besoin d'un commentaire pour le main ?
int main(int argc,char *argv[])
{
  if(argc>1){
    init_sdl();
    SDL_Surface* image = load_image(argv[1]);
    image = display_image(image);
    SDL_FreeSurface(image);
    image = load_image(argv[1]);
    BW(image);
  }
  return 0;
}