Function DimKeep

jni/stasm/misc.cpp:278–302

// The returned matrix may or may not use the same buffer as mat.

MAT DimKeep(const MAT& mat, int nrows, int ncols)
{
    if (mat.rows == nrows && mat.cols == ncols) // no change needed?
        return mat;
    if (mat.rows * mat.cols == nrows * ncols)   // same number of elements?
    {
        CV_Assert(mat.isContinuous());
        MAT newmat(mat);
        newmat.rows = nrows;
        newmat.cols = ncols;
        newmat.step = ncols * sizeof(newmat(0));
        return newmat;
    }
    // copy as much of the data as will fit in the new matrix
    MAT newmat(nrows, ncols, 0.);
    int minrows = MIN(nrows, mat.rows);
    for (int i = 0; i < minrows; i++)
    {
        const double* const rowbuf = mat.ptr<double>(i);
        double* const rowbuf1 = newmat.ptr<double>(i);
        for (int j = 0; j < ncols; j++)
            rowbuf1[j] = rowbuf[j];
    }
    return newmat;
}

const MAT ArrayAsMat(    // create a MAT from a C array of doubles
    int           nrows, // in