#include <iostream>
#include <conio.h>
#define STB_IMAGE_IMPLEMENTATION
#include "stb/stb_image.h"

#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb/stb_image_write.h"


int filter[] = {1,2,1,
                2,4,2,
                1,2,1
               };



using namespace std;
unsigned char* makeStuff(unsigned char *img, int width,int height, int channel)
{
    size_t s = (width-2)*(height-2)*channel;
    unsigned char *res = (unsigned char *)malloc(s);
    for(int i =1; i<width-1; i++)
    {
        for(int j =1; j<height-1; j++)
        {
            for(int z =0; z<channel; z++)
            {
                //upper
                res[((i - 1) + height * (j - 1)) * z] = (unsigned char)(img[((i - 1) + height * (j - 1)) * z] * filter[0] );
                res[(i + height * (j - 1) )* z] =    (unsigned char)(img[(i + height * (j - 1) )* z] * filter[1] );
                res[((i + 1) + height * (j - 1) )* z] = (unsigned char)(img[((i + 1) + height * (j - 1) )* z] * filter[2] );

                //center
                res[((i - 1) + (height * j) )* z] = (unsigned char)(img[((i - 1) + (height * j) )* z] * filter[3] );
                res[(i + height * j )* z] =     (unsigned char)(img[(i + height * j )* z] * filter[4] );
                res[((i + 1) + height * j )* z] = (unsigned char)(img[((i + 1) + height * j )* z] * filter[5] );

                //lower
                res[((i - 1) + height * (j + 1)) * z] = (unsigned char)(img[((i - 1) + height * (j + 1)) * z] * filter[6] );
                res[(i + height * (j + 1)) * z] =     (unsigned char)(img[(i + height * (j + 1)) * z] * filter[7] );
                res[((i + 1) + height * (j + 1)) * z] = (unsigned char)(img[((i + 1) + height * (j + 1)) * z] * filter[8] );
            }
        }
    }


    return res;
}





int main()
{
    string path = "t.jpg";
    int w,h,ch;
    unsigned char *image = stbi_load(path.c_str(),&w,&h,&ch,0);
    cout<<ch;
    unsigned char *im = makeStuff(image,w,h,ch);

    cout<<sizeof(image)/sizeof(char);

    stbi_write_jpg("t2.jpg",w,h,ch,im,100);

//cout<<w<<" "<<h<<" "<<ch<<endl;
    return 0;
}