Function loopirev

source/src/worldlight.cpp:134–144

void postlightarealine(sqr *s, int len)
{
    loopirev(len)
    {
        #define median(m) s->m = (s->m*2 + SW(s,1,0)->m*2  + SW(s,0,1)->m*2 \
                                         + SW(s,-1,0)->m*2 + SW(s,0,-1)->m*2 \
                                         + SW(s,1,1)->m    + SW(s,1,-1)->m \
                                         + SW(s,-1,1)->m   + SW(s,-1,-1)->m)/14;  // median is 4/2/1 instead
        median(r);
        median(g);
        median(b);
        s += 2;
    }
}

void postlightarea(const block &a)    // median filter, smooths out random noise in light and makes it more mipable