Rotating a bitmap 90 degrees

Question

I have a one 64-bit integer, which I need to rotate 90 degrees in 8 x 8 area (preferably with straight bit-manipulation). I cannot figure out any handy algorith

Answer 1

probably something like that

for(int i = 0; i < 8; i++)
{
    for(int j = 0; j < 8; j++)
    {
        new_image[j*8+8-i] = image[i*8+j];
    }
}