color multiplication

gistfile1.txt

public int colorMult(int x, int y)
    {
        int res = 0;
        for (int octet = 0; octet < 3; octet++)
        {
            int shift = (8*octet);
            int xoct = (x & (0xff << shift)) >> shift;
            int yoct = (y & (0xff << shift)) >> shift;
            xoct *= yoct;
            xoct /= 0xff;
            res += xoct << shift;
        }
        return res;
    }