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# Copyright (c) 2016 Ultimaker B.V.
# Uranium is released under the terms of the LGPLv3 or higher.
from typing import Union, List, cast
import numpy
from copy import deepcopy
def immutableNDArray(nda: Union[List, numpy.ndarray]) -> numpy.ndarray:
"""Creates an immutable copy of the given narray
If the array is already immutable then it just returns it.
:param nda: :type{numpy.ndarray} the array to copy. May be a list
:return: :type{numpy.ndarray} an immutable narray
"""
if nda is None:
return None
if type(nda) is list:
data = numpy.array(nda, numpy.float32)
data.flags.writeable = False
else:
data = cast(numpy.ndarray, nda)
if not data.flags.writeable:
return data
copy = deepcopy(data)
copy.flags.writeable = False
return copy
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