double c[8][8],is;void di(){int u,v;is=1./sqrt(2.);for(u=0;u<8;u++)for(v=0;x<8;
x++)c[u][x]=cos((2.*x+1.)*u*M_PI/16.);}void dc(int *b){int v,u,x,y,w[64];double
s,cu,cv;for(v=0;v<8;v++){cv=(v==0)?is:1.0;for(u=0;u<8;u++){cu=(u==0)?is:1.;s=0;
for(y=0;y<8;y+)for(x=0;x<8;x++)s+=b[y*8+x]*c[u][x]*c[v][y];w[v*8+u]=(int)(s*cu*
cv/4);}}}