orga2-simd/filtros/diff_c.c

#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 filas, int cols, 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<cols; i++){
		for(j=0; j<filas * 4; j+=4){
			val=max(abs(src_matrix[i][j+0]-src_2_matrix[i][j+0]),		// Diferencia de canal B y max
 					abs(src_matrix[i][j+1]-src_2_matrix[i][j+1]),		// Diferencia G
  					abs(src_matrix[i][j+2]-src_2_matrix[i][j+2]));		// Diferencia R

			dst_matrix[i][j+0]=val;		// Guardo B
			dst_matrix[i][j+1]=val;		// Guardo G
			dst_matrix[i][j+2]=val;		// Guardo R
			dst_matrix[i][j+3]=255;		// Alpha siempre tiene 255
		}
	}
}