core: allow to construct CvMat from native cv::Mat pointer. #864
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This patch solves the use-case when there is a mix of native code that uses opencv and gocv. In case that native code that utilizes opencv creates a CvMat and there is a need to pass it to the golang environment without creating a copy. The solution is to pass a native pointer to gocv and eventually call cv::Mat copy constructor that performs shallow copy of the origin CvMat. (See https://docs.opencv.org/4.5.2/d3/d63/classcv_1_1Mat.html#a294eaf8a95d2f9c7be19ff594d06278e) for more details.
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This patch solves the use-case when there is a mix of native code that
uses opencv and gocv.
In case that native code that utilizes opencv creates a CvMat and there
is a need to pass it to the golang environment without creating a copy.
The solution is to pass a native pointer to gocv and eventually call
cv::Mat copy constructor that performs shallow copy of the origin CvMat.
(See
https://docs.opencv.org/4.5.2/d3/d63/classcv_1_1Mat.html#a294eaf8a95d2f9c7be19ff594d06278e)
for more details.