added OpenCL version of cv::scaleAdd

modules/core/src/opencl/arithm.cl

@@ -91,6 +91,9 @@
 
 #else
 
+    #ifndef convertToWT2
+    #define convertToWT2 convertToWT1
+    #endif
     #define srcelem1 convertToWT1(*(__global srcT1*)(srcptr1 + src1_index))
     #define srcelem2 convertToWT2(*(__global srcT2*)(srcptr2 + src2_index))
 
@@ -230,6 +233,11 @@ dstelem = v > (dstT)(0) ? log(v) : log(-v)
     workT value = srcelem1 * alpha + beta; \
     dstelem = convertToDT(value >= 0 ? value : -value)
 
+#elif defined OP_SCALE_ADD
+#undef EXTRA_PARAMS
+#define EXTRA_PARAMS , workT alpha
+#define PROCESS_ELEM dstelem = convertToDT(srcelem1 * alpha + srcelem2)
+
 #elif defined OP_CTP_AD || defined OP_CTP_AR
 #ifdef OP_CTP_AD
 #define TO_DEGREE cartToPolar *= (180 / CV_PI);