Adding back MatConstIterator_::pos implementation

modules/core/include/opencv2/core/mat.hpp

@@ -1804,6 +1804,25 @@ template<typename _Tp> inline MatIterator_<_Tp> MatIterator_<_Tp>::operator ++(i
     return b;
 }
 
+// Fixing a back compatibility problem -- to be reviewed by Vadim
+template<typename _Tp> inline Point MatConstIterator_<_Tp>::pos() const
+{
+    if( !m )
+        return Point();
+    if( m->isContinuous() )
+    {
+        ptrdiff_t ofs = ptr - (_Tp*)m->data;
+        int y = (int)(ofs / m->cols), x = (int)(ofs - (ptrdiff_t)y*m->cols);
+        return Point(x, y);
+    }
+    else
+    {
+        ptrdiff_t ofs = (uchar*)ptr - m->data;
+        int y = (int)(ofs / m->step), x = (int)((ofs - y*m->step)/sizeof(_Tp));
+        return Point(x, y);
+    }
+}
+
 static inline bool
 operator == (const MatConstIterator& a, const MatConstIterator& b)
 { return a.m == b.m && a.ptr == b.ptr; }