Function rdo_partition_simple

fn rdo_partition_simple<T: Pixel, W: Writer>(
    fi: &FrameInvariants<T>,
    ts: &mut TileStateMut<'_, T>,
    cw: &mut ContextWriter<'_>,
    w_pre_cdef: &mut W,
    w_post_cdef: &mut W,
    bsize: BlockSize,
    tile_bo: TileBlockOffset,
    inter_cfg: &InterConfig,
    partition: PartitionType,
    rdo_type: RDOType,
    best_rd: f64,
    child_modes: &mut ArrayVec<PartitionParameters, 4>,
) -> Option<f64>