Flip and rotate

switch (rotation)
{
    case BitmapRotation.Clockwise90Degrees:
    case BitmapRotation.Clockwise270Degrees:
        switch (next)
        {
            case BitmapFlip.None:
                next = BitmapFlip.Vertical;
                break;
            case BitmapFlip.Vertical:
                next = BitmapFlip.None;
                break;
            case BitmapFlip.Horizontal:
                next = BitmapFlip.None;
                rotation = rotation == BitmapRotation.Clockwise90Degrees
                    ? BitmapRotation.Clockwise270Degrees
                    : BitmapRotation.Clockwise90Degrees;
                break;
        }
        break;
    case BitmapRotation.None:
    case BitmapRotation.Clockwise180Degrees:
        switch (next)
        {
            case BitmapFlip.None:
                next = BitmapFlip.Horizontal;
                break;
            case BitmapFlip.Horizontal:
                next = BitmapFlip.None;
                break;
            case BitmapFlip.Vertical:
                next = BitmapFlip.None;
                rotation = rotation == BitmapRotation.None
                    ? BitmapRotation.Clockwise180Degrees
                    : BitmapRotation.None;
                break;
        }
        break;
}