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#include <stdio.h>
 
int main(){
    short image[60][40]; // the array to store the text image
    FILE * infile = fopen("inimage.txt", "r"); // text image input file
 
    for(int i = 0; i < 60; i++){
        for(int j = 0; j < 40; j++){
            fscanf(infile, "%d\t", &image[i][j]); // this will read an integer and store it in the array, then read a tab
        }
    }
 
    short quick_mask[3][3] = { {-1, 0, -1}, {0, 4, 0},{-1, 0, -1} }; // this is the mask which will be convoluted with the image array
 
    short store = 0; // integer to store each output element
    FILE * outfile = fopen("outimage.txt", "w"); // text image output folder
 
    // nested for loop to perform the convolution
    for(int i = 0; i < 60; i++){
        for(int j = 0; j < 40; j++){
            if(i < 58 && j < 38) // to skip the edge of the text image
                {
                    // convolution calculation ( mask * image)
                    store = (image[i-1+1][j-1+1]    * quick_mask[0][0])     +
                    (image[i-1+1][j+1]  * quick_mask[0][1])     +
                    (image[i-1+1][j+1+1]    * quick_mask[0][2])     +
                    (image[i+1][j-1+1]  * (quick_mask[1][0])    +
                    (image[i+1][j+1])   * quick_mask[1][1])     + 
                    (image[i+1][j+1+1]  * quick_mask[1][2])     +
                    (image[i+1+1][j-1+1]    * quick_mask[2][0])     + 
                    (image[i+1+1][j+1]  * quick_mask[2][1])     + 
                    (image[i+1+1][j+1+1]    * quick_mask[2][2])     ;
                }
            else{
                // edges will be always 0
                store = 0;
            }
 
            if(store < 0) store = 0; // min color is black (0)
            else if(store > 255) store = 255; // max color is white ( 255)
            fprintf(outfile, "%d\t", store); // write the output into a file
        }
        fprintf(outfile, "\n"); // add a new line each row
    }
 
    return 0; // end of the program
}