def bbox_scaling(bboxes, scale, clip_shape=None):
    """Scaling bboxes w.r.t the box center.

    Args:
        bboxes (ndarray): Shape(..., 4).
        scale (float): Scaling factor.
        clip_shape (tuple[int], optional): If specified, bboxes that exceed the
            boundary will be clipped according to the given shape (h, w).

    Returns:
        ndarray: Scaled bboxes.
    """
    if float(scale) == 1.0:
        scaled_bboxes = bboxes.copy()
    else:
        w = bboxes[..., 2] - bboxes[..., 0] + 1
        h = bboxes[..., 3] - bboxes[..., 1] + 1
        dw = (w * (scale - 1)) * 0.5
        dh = (h * (scale - 1)) * 0.5
        scaled_bboxes = bboxes + np.stack((-dw, -dh, dw, dh), axis=-1)
    if clip_shape is not None:
        return bbox_clip(scaled_bboxes, clip_shape)
    else:
        return scaled_bboxes
Scaling bboxes w.r.t the box center.

    Args:
        bboxes (ndarray): Shape(..., 4).
        scale (float): Scaling factor.
        clip_shape (tuple[int], optional): If specified, bboxes that exceed the
            boundary will be clipped according to the given shape (h, w).

    Returns:
        ndarray: Scaled bboxes.
    
ControlNet-v1-1-nightly/annotator/uniformer/mmcv/image/geometric.py