fixing build of 2.4 branch with VC12 (aka 2013)

(master branch was fixed before, no need to merge this to master!)
- disable openexr (numerous undefined std::min & std::max)
- workaround for two compilator bugs

CMakeLists.txt

@@ -140,7 +140,7 @@ OCV_OPTION(WITH_IMAGEIO        "ImageIO support for OS X"                    OFF
 OCV_OPTION(WITH_IPP            "Include Intel IPP support"                   OFF  IF (MSVC OR X86 OR X86_64) )
 OCV_OPTION(WITH_JASPER         "Include JPEG2K support"                      ON   IF (NOT IOS) )
 OCV_OPTION(WITH_JPEG           "Include JPEG support"                        ON)
-OCV_OPTION(WITH_OPENEXR        "Include ILM support via OpenEXR"             ON   IF (NOT IOS) )
+OCV_OPTION(WITH_OPENEXR        "Include ILM support via OpenEXR"             ON   IF (NOT IOS AND NOT MSVC12) )
 OCV_OPTION(WITH_OPENGL         "Include OpenGL support"                      OFF  IF (NOT ANDROID AND NOT APPLE) )
 OCV_OPTION(WITH_OPENNI         "Include OpenNI support"                      OFF  IF (NOT ANDROID AND NOT IOS) )
 OCV_OPTION(WITH_PNG            "Include PNG support"                         ON)

modules/features2d/src/features2d_init.cpp

@@ -181,7 +181,7 @@ CV_INIT_ALGORITHM(DenseFeatureDetector, "Feature2D.Dense",
                   obj.info()->addParam(obj, "varyImgBoundWithScale", obj.varyImgBoundWithScale));
 
 CV_INIT_ALGORITHM(GridAdaptedFeatureDetector, "Feature2D.Grid",
-                  obj.info()->addParam(obj, "detector", obj.detector);
+                  obj.info()->addParam(obj, "detector", (Ptr<Algorithm>&)obj.detector);
                   obj.info()->addParam(obj, "maxTotalKeypoints", obj.maxTotalKeypoints);
                   obj.info()->addParam(obj, "gridRows", obj.gridRows);
                   obj.info()->addParam(obj, "gridCols", obj.gridCols));

modules/features2d/src/orb.cpp

@@ -138,13 +138,16 @@ static void computeOrbDescriptor(const KeyPoint& kpt,
     const uchar* center = &img.at<uchar>(cvRound(kpt.pt.y), cvRound(kpt.pt.x));
     int step = (int)img.step;
 
+    float x, y;
+    int ix, iy;
 #if 1
     #define GET_VALUE(idx) \
-        center[cvRound(pattern[idx].x*b + pattern[idx].y*a)*step + \
-               cvRound(pattern[idx].x*a - pattern[idx].y*b)]
+           (x = pattern[idx].x*a - pattern[idx].y*b, \
+            y = pattern[idx].x*b + pattern[idx].y*a, \
+            ix = cvRound(x), \
+            iy = cvRound(y), \
+            *(center + iy*step + ix) )
 #else
-    float x, y;
-    int ix, iy;
     #define GET_VALUE(idx) \
         (x = pattern[idx].x*a - pattern[idx].y*b, \
         y = pattern[idx].x*b + pattern[idx].y*a, \