Mi_Width_Log2[ BLOCK_SIZES ] =
{
    0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3,
    4, 4, 4, 5, 5, 5, 6, 6, 0, 2, 1, 3, 2, 4,
    0, 3, 1, 4
}