#include <stdlib.h>
#include <math.h>
#include "../tp2.h"

unsigned int max(unsigned int a, unsigned int b, unsigned int c){
	if (a > b) {
		return a > c ? a : c;
	}else {
		return b > c ? b : c;
	}
}

void diff_c (unsigned char *src, unsigned char *src_2, unsigned char *dst, int m, int n, int src_row_size, int src_2_row_size, int dst_row_size) {
	unsigned char (*src_matrix)[src_row_size] = (unsigned char (*)[src_row_size]) src;
	unsigned char (*src_2_matrix)[src_2_row_size] = (unsigned char (*)[src_2_row_size]) src_2;
	unsigned char (*dst_matrix)[dst_row_size] = (unsigned char (*)[dst_row_size]) dst;

	int i,j;
	short val;

	for(i=0;i<n;i++){
		for(j=0;j<m*4;j+=4){
			val=max(abs(src_matrix[i][j+0]-src_2_matrix[i][j+0]),
 					abs(src_matrix[i][j+1]-src_2_matrix[i][j+1]),
  					abs(src_matrix[i][j+2]-src_2_matrix[i][j+2]));

			dst_matrix[i][j+0]=val;
			dst_matrix[i][j+1]=val;
			dst_matrix[i][j+2]=val;
			dst_matrix[i][j+3]=255;
		}
	}
}