1  typedef struct{struct{char*d;int b;}*i;}*t;
       2  double f();
       3  g(p)t p;
       4  {
       5    short x,y,delta,s,w,h,fx,fy,tx,ty;
       6    int q1,q2,q3,q4;
       7    h=f((ty-fy)/2.0+0.5);
       8    s=(((int)((short)(tx-fx))<(int)((short)(ty-fy)))?((short)(tx-fx)):((short)(ty-fy)))%2;
       9    delta=(((int)(w)<(int)(h))?(w):(h))-s;
      10    for(x=0;x<=delta;x++)
      11      for(y=1-s;y<=delta;y++){
      12        q1=((int)((*(p->i->d+(fx+w+x)/8+(fy+h+y)*p->i->b)&(1<<((fx+w+x)%8)))?1:0));
      13        q2=((int)((*(p->i->d+(fx+w+y)/8+(fy+h-s-x)*p->i->b)&(1<<((fx+w+y)%8)))?1:0));
      14        q3=((int)((*(p->i->d+(fx+w-s-x)/8+(fy+h-s-y)*p->i->b)&(1<<((fx+w-s-x)%8)))?1:0));
      15        q4=((int)((*(p->i->d+(fx+w-s-y)/8+(fy+h+x)*p->i->b)&(1<<((fx+w-s-y)%8)))?1:0));
      16        if(q4!=q1)
      17  	ff(p,fx+w-s-y,fy+h+x);
      18      }
      19  }