added Matx<4,4>*Scalar operator (ticket #1830)

modules/core/include/opencv2/core/operations.hpp

@@ -676,14 +676,23 @@ Matx<_Tp, 4, 1> operator * (const Matx<_Tp, 4, 4>& a, const Point3_<_Tp>& b)
     return a*Matx<_Tp, 4, 1>(b.x, b.y, b.z, 1);
 }    
 
-    
+
 template<typename _Tp> static inline
 Scalar operator * (const Matx<_Tp, 4, 4>& a, const Scalar& b)
 {
-    return Scalar(a*Matx<_Tp, 4, 1>(b[0],b[1],b[2],b[3]));
-}    
+    Matx<double, 4, 1> c(Matx<double, 4, 4>(a), b, Matx_MatMulOp());
+    return reinterpret_cast<const Scalar&>(c);
+}
+
     
+static inline
+Scalar operator * (const Matx<double, 4, 4>& a, const Scalar& b)
+{
+    Matx<double, 4, 1> c(a, b, Matx_MatMulOp());
+    return reinterpret_cast<const Scalar&>(c);
+}
 
+    
 template<typename _Tp, int m, int n> inline
 Matx<_Tp, m, n> Matx<_Tp, m, n>::mul(const Matx<_Tp, m, n>& a) const
 {

modules/core/test/test_operations.cpp

@@ -808,6 +808,22 @@ bool CV_OperationsTest::TestMatxMultiplication()
         if(res2[0] != 14.0) throw test_excep(); 
         if(res2[1] != 6.0) throw test_excep(); 
         if(res2[2] != 1.0) throw test_excep();
+        
+        Matx44f mat44f(1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1);
+        Matx44d mat44d(1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1);
+        Scalar s(4, 3, 2, 1);
+        Scalar sf = mat44f*s;
+        Scalar sd = mat44d*s;
+        
+        if(sf[0] != 10.0) throw test_excep(); 
+        if(sf[1] != 6.0) throw test_excep(); 
+        if(sf[2] != 3.0) throw test_excep();
+        if(sf[3] != 1.0) throw test_excep();
+        
+        if(sd[0] != 10.0) throw test_excep(); 
+        if(sd[1] != 6.0) throw test_excep(); 
+        if(sd[2] != 3.0) throw test_excep();
+        if(sd[3] != 1.0) throw test_excep();
     } 
     catch(const test_excep&) 
     {