#include <iostream>
#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
using namespace std;
using namespace cv;

class MatRef
{
public:
   inline MatRef(int rows, int cols, uchar (*data)[3]);
   static void ShowMatrix(const string&& str, const Mat& mat);
   inline void ShowMatrix(const string&& str) const;
   inline void RefCount() const;
   inline Mat& operator=(const Mat& rhs);  
   inline Mat GetMatrix() const;
   inline Mat& GetMatrixRef();
   inline Mat LocationRoi(Range&& rowRange, Range&& colRange);
   inline Mat LocationRoi(Rect&& rect);

private:
   Mat mat;
};

MatRef::MatRef(int rows, int cols, uchar (*data)[3]);
{
    // mat = (Mat_<double>(2, 3) << 1, 2, 3, 4, 5, 6);
    for (int i = 0; i < rows; ++i)
        mat.push_back(move(Mat(1, cols, CV_8UC1, data + i)));
}

void MatRef::ShowMatrix(const string&& str) const
{
    cout << str << endl << mat << endl;
}

void MatRef::ShowMatrix(const string&& str, const Mat& mat)
{
    cout << str << endl << mat << endl;
}

void MatRef::RefCount() const
{
    cout << "The ref count of matrix = " << mat.u->refcount << endl;
}

Mat& MatRef::operator=(const Mat& rhs)
{
    return mat = rhs;
}

Mat MatRef::LocationRoi(Rect&& rect)
{
    ShowMatrix("matrix = ");
    Mat roi(mat, rect);
    ShowMatrix("roi = ", roi);
    cout << "rect = " << rect << endl;
    return roi;
}

Mat MatRef::LocationRoi(Range&& rowRange, Range&& colRange)
{
    Size wholeSize;
    Point pt;
    Mat roi = mat(rowRange, colRange);
    ShowMatrix("matrix = ");
    roi.locateROI(wholeSize, pt);  // 定位感兴趣的区域
    cout << "whole size   = " << wholeSize << endl;
    cout << "offset point = " << pt << endl;
    ShowMatrix("roi = ", roi);
    return roi;
}

Mat MatRef::GetMatrix() const
{
    return mat.clone();
}

Mat& MatRef::GetMatrixRef()
{
    return mat;
}

int main()
{
    uchar arr[][3] = { { 1, 2, 3 }, { 4, 5, 6 } };
    uchar(*ptr)[3] = arr;   // 行指针指向多维数组时不需要取多维数组的地址, 一维数组必须取地址

    MatRef a(2, 3, ptr);
    a.ShowMatrix("matrix = ");
    a.RefCount();

    Mat b = a.GetMatrixRef();
    a.RefCount();

    Mat c = a.GetMatrix();
    a.RefCount();

    // 利用行列区间定位感兴趣的区域
    int rowStart = 0, rowEnd = 1, colStart = 1, colsEnd = 3;
    a.LocationRoi(Range(rowStart, rowEnd), Range(colStart, colsEnd));

    // 根据矩阵中的一个点的坐标和size范围定位感兴趣的区域
    Point pt(1, 0);
    int with = 2, height = 1;
    a.LocationRoi(Rect(pt.x, pt.y, with, height));

    Mat d = a.GetMatrixRef();
    a.RefCount();

    cout << "if matrix d is refference of matrixRef then d.row(1) = d.row(0) + d.row(1)" << endl;
    d.row(1) = d.row(0) + d.row(1);
    MatRef::ShowMatrix("matrix d = ", d);
    a.RefCount();

    Mat e = a.GetMatrixRef();
    a.RefCount();

    Mat t(e.col(1) + e.col(2));
    t.copyTo(e.col(0));
    MatRef::ShowMatrix("matrix e = ", e);
    a.RefCount();

    return 0;
}