fixed problem with Mat::copyTo() with Mat_<> arguments (ticket #1918)

modules/core/src/matrix.cpp

@@ -1352,7 +1352,7 @@ void _OutputArray::create(int dims, const int* size, int type, int i, bool allow
             if(CV_MAT_CN(type) == m.channels() && ((1 << CV_MAT_TYPE(flags)) & fixedDepthMask) != 0 )
                 type = m.type();
             else
-                CV_Assert(!fixedType() || (CV_MAT_CN(type) == m.channels() && ((1 << CV_MAT_TYPE(flags)) & fixedDepthMask) != 0));
+                CV_Assert(CV_MAT_TYPE(type) == m.type());
         }
         if(fixedSize())
         {

modules/core/test/test_arithm.cpp

@@ -1504,6 +1504,14 @@ protected:
                 d.convertTo(d1, depth);
                 CV_Assert( norm(c, d1, CV_C) <= DBL_EPSILON );
             }
+            
+            Mat_<uchar> tmpSrc(100,100);
+            tmpSrc = 124;
+            Mat_<uchar> tmpMask(100,100);
+            tmpMask = 255;
+            Mat_<uchar> tmpDst(100,100);
+            tmpDst = 2;
+            tmpSrc.copyTo(tmpDst,tmpMask);
         }
         catch(...)
         {