descale_args.py

def descale_args(
    clip: vs.VideoNode,
    width: int | float = None,
    height: int | float = None,
    src_left: float = None,
    src_top: float = None,
    width_parity: int = None,
    height_parity: int = None,
):
    out_args = dict()

    if not float(width).is_integer():
        src_width = width
        width_parity = clip.width - width_parity
        width = width_parity - 2 * floor((width_parity - src_width) / 2)
        shift_left = (width - src_width) / 2
        src_left = shift_left + src_left if src_left else shift_left
        out_args.update(src_width=src_width)

    if not float(height).is_integer():
        src_height = height
        height_parity = clip.height - height_parity
        height = height_parity - 2 * floor((height_parity - src_height) / 2)
        shift_top = (height - src_height) / 2
        src_top = shift_top + src_top if src_top else shift_top
        out_args.update(src_height=src_height)

    out_args.update(width=width, height=height)
    if src_left:
        out_args.update(src_left=src_left)
    if src_top:
        out_args.update(src_top=src_top)
    return out_args