Function cvGetMatND

deps/opencv/modules/core/src/array.cpp:319–363

static CvMatND*
cvGetMatND( const CvArr* arr, CvMatND* matnd, int* coi )
{
    CvMatND* result = 0;

    if( coi )
        *coi = 0;

    if( !matnd || !arr )
        CV_Error( CV_StsNullPtr, "NULL array pointer is passed" );

    if( CV_IS_MATND_HDR(arr))
    {
        if( !((CvMatND*)arr)->data.ptr )
            CV_Error( CV_StsNullPtr, "The matrix has NULL data pointer" );

        result = (CvMatND*)arr;
    }
    else
    {
        CvMat stub, *mat = (CvMat*)arr;

        if( CV_IS_IMAGE_HDR( mat ))
            mat = cvGetMat( mat, &stub, coi );

        if( !CV_IS_MAT_HDR( mat ))
            CV_Error( CV_StsBadArg, "Unrecognized or unsupported array type" );

        if( !mat->data.ptr )
            CV_Error( CV_StsNullPtr, "Input array has NULL data pointer" );

        matnd->data.ptr = mat->data.ptr;
        matnd->refcount = 0;
        matnd->hdr_refcount = 0;
        matnd->type = mat->type;
        matnd->dims = 2;
        matnd->dim[0].size = mat->rows;
        matnd->dim[0].step = mat->step;
        matnd->dim[1].size = mat->cols;
        matnd->dim[1].step = CV_ELEM_SIZE(mat->type);
        result = matnd;
    }

    return result;
}


// returns number of dimensions to iterate.