Extract code from scalarToRawData

The same code was repeated several time for different data types, so
it was extracted as a templated function to improve maintability and
make a code more clear.

modules/core/src/matrix.cpp

@@ -1140,78 +1140,45 @@ int Mat::checkVector(int _elemChannels, int _depth, bool _requireContinuous) con
     ? (int)(total()*channels()/_elemChannels) : -1;
 }
 
+template <typename T> static inline
+void scalarToRawData(const Scalar& s, T * const buf, const int cn, const int unroll_to)
+{
+    int i = 0;
+    for(; i < cn; i++)
+        buf[i] = saturate_cast<T>(s.val[i]);
+    for(; i < unroll_to; i++)
+        buf[i] = buf[i-cn];
+}
 
 void scalarToRawData(const Scalar& s, void* _buf, int type, int unroll_to)
 {
     CV_INSTRUMENT_REGION()
 
-    int i, depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
+    const int depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
     CV_Assert(cn <= 4);
     switch(depth)
     {
     case CV_8U:
-        {
-        uchar* buf = (uchar*)_buf;
-        for(i = 0; i < cn; i++)
-            buf[i] = saturate_cast<uchar>(s.val[i]);
-        for(; i < unroll_to; i++)
-            buf[i] = buf[i-cn];
-        }
+        scalarToRawData<uchar>(s, (uchar*)_buf, cn, unroll_to);
         break;
     case CV_8S:
-        {
-        schar* buf = (schar*)_buf;
-        for(i = 0; i < cn; i++)
-            buf[i] = saturate_cast<schar>(s.val[i]);
-        for(; i < unroll_to; i++)
-            buf[i] = buf[i-cn];
-        }
+        scalarToRawData<schar>(s, (schar*)_buf, cn, unroll_to);
         break;
     case CV_16U:
-        {
-        ushort* buf = (ushort*)_buf;
-        for(i = 0; i < cn; i++)
-            buf[i] = saturate_cast<ushort>(s.val[i]);
-        for(; i < unroll_to; i++)
-            buf[i] = buf[i-cn];
-        }
+        scalarToRawData<ushort>(s, (ushort*)_buf, cn, unroll_to);
         break;
     case CV_16S:
-        {
-        short* buf = (short*)_buf;
-        for(i = 0; i < cn; i++)
-            buf[i] = saturate_cast<short>(s.val[i]);
-        for(; i < unroll_to; i++)
-            buf[i] = buf[i-cn];
-        }
+        scalarToRawData<short>(s, (short*)_buf, cn, unroll_to);
         break;
     case CV_32S:
-        {
-        int* buf = (int*)_buf;
-        for(i = 0; i < cn; i++)
-            buf[i] = saturate_cast<int>(s.val[i]);
-        for(; i < unroll_to; i++)
-            buf[i] = buf[i-cn];
-        }
+            scalarToRawData<int>(s, (int*)_buf, cn, unroll_to);
         break;
     case CV_32F:
-        {
-        float* buf = (float*)_buf;
-        for(i = 0; i < cn; i++)
-            buf[i] = saturate_cast<float>(s.val[i]);
-        for(; i < unroll_to; i++)
-            buf[i] = buf[i-cn];
-        }
+        scalarToRawData<float>(s, (float*)_buf, cn, unroll_to);
         break;
     case CV_64F:
-        {
-        double* buf = (double*)_buf;
-        for(i = 0; i < cn; i++)
-            buf[i] = saturate_cast<double>(s.val[i]);
-        for(; i < unroll_to; i++)
-            buf[i] = buf[i-cn];
+        scalarToRawData<double>(s, (double*)_buf, cn, unroll_to);
         break;
-        }
     default:
         CV_Error(CV_StsUnsupportedFormat,"");
     }