fix build (related to PR #3814)

modules/photo/src/fast_nlmeans_denoising_invoker_commons.hpp

@@ -44,6 +44,14 @@
 
 using namespace cv;
 
+// std::isnan is a part of C++11 and it is not supported in MSVS2010/2012
+#if defined _MSC_VER && _MSC_VER < 1800 /* MSVC 2013 */
+#include <float.h>
+namespace std {
+template <typename T> bool isnan(T value) { return _isnan(value) != 0; }
+}
+#endif
+
 template <typename T> struct pixelInfo_
 {
     static const int channels = 1;
@@ -130,7 +138,7 @@ class DistAbs
             if (std::isnan(w)) w = 1.0; // Handle h = 0.0
 
             static const double WEIGHT_THRESHOLD = 0.001;
-            WT weight = (WT)round(fixed_point_mult * w);
+            WT weight = (WT)cvRound(fixed_point_mult * w);
             if (weight < WEIGHT_THRESHOLD * fixed_point_mult) weight = 0;
 
             return weight;
@@ -252,7 +260,7 @@ class DistSquared
             if (std::isnan(w)) w = 1.0; // Handle h = 0.0
 
             static const double WEIGHT_THRESHOLD = 0.001;
-            WT weight = (WT)round(fixed_point_mult * w);
+            WT weight = (WT)cvRound(fixed_point_mult * w);
             if (weight < WEIGHT_THRESHOLD * fixed_point_mult) weight = 0;
 
             return weight;