Reptorian G'MIC Filters

Software G'MIC
, , ,
367 
repeat $! l[$>]
    +to_gray /. 5
    f.. "begin(val=0;);
    off=abs(round(i(#-1,x,y,z,0)));
    if(off,
    for(xx=off*-1,xx<=off,xx++,
        for(yy=off*-1,yy<=off,yy++,
            val+=j(xx,yy,0,0,0,1);
        );
    );
    val/=sqr(off*2+1);,i
    );
    "
    rm.
endl done

Made this command which average blur depending on pixel values. Is anyone interested in this? I didn’t use crop here because I don’t see boundary condition, and strictly positive only.