minor ocl.cpp refactoring

fix for cv::LUT and cv::transpose

modules/core/include/opencv2/core/ocl.hpp

@@ -90,7 +90,8 @@ public:
     String vendor() const;
     String OpenCL_C_Version() const;
     String OpenCLVersion() const;
-    String deviceVersion() const;
+    int deviceVersionMajor() const;
+    int deviceVersionMinor() const;
     String driverVersion() const;
     void* ptr() const;
 
@@ -224,16 +225,12 @@ public:
     static Context2& getDefault(bool initialize = true);
     void* ptr() const;
 
-    struct Impl;
-    inline struct Impl* _getImpl() const { return p; }
+    friend void initializeContextFromHandle(Context2& ctx, void* platform, void* context, void* device);
 protected:
+    struct Impl;
     Impl* p;
 };
 
-
-// TODO Move to internal header
-void initializeContextFromHandle(Context2& ctx, void* platform, void* context, void* device);
-
 class CV_EXPORTS Platform
 {
 public:
@@ -245,12 +242,14 @@ public:
     void* ptr() const;
     static Platform& getDefault();
 
-    struct Impl;
-    inline struct Impl* _getImpl() const { return p; }
+    friend void initializeContextFromHandle(Context2& ctx, void* platform, void* context, void* device);
 protected:
+    struct Impl;
     Impl* p;
 };
 
+// TODO Move to internal header
+void initializeContextFromHandle(Context2& ctx, void* platform, void* context, void* device);
 
 class CV_EXPORTS Queue
 {
@@ -585,9 +584,12 @@ class CV_EXPORTS Image2D
 {
 public:
     Image2D();
-    Image2D(const UMat &src);
+    explicit Image2D(const UMat &src);
+    Image2D(const Image2D & i);
     ~Image2D();
 
+    Image2D & operator = (const Image2D & i);
+
     void* ptr() const;
 protected:
     struct Impl;

modules/core/src/convert.cpp

@@ -1505,6 +1505,9 @@ static bool ocl_LUT(InputArray _src, InputArray _lut, OutputArray _dst)
                   format("-D dcn=%d -D lcn=%d -D srcT=%s -D dstT=%s%s", dcn, lcn,
                          ocl::typeToStr(src.depth()), ocl::typeToStr(ddepth),
                          doubleSupport ? " -D DOUBLE_SUPPORT" : ""));
+    if (k.empty())
+        return false;
+
     k.args(ocl::KernelArg::ReadOnlyNoSize(src), ocl::KernelArg::ReadOnlyNoSize(lut),
            ocl::KernelArg::WriteOnly(dst));
 

modules/core/src/matrix.cpp

@@ -2909,6 +2909,9 @@ static bool ocl_transpose( InputArray _src, OutputArray _dst )
     ocl::Kernel k(kernelName.c_str(), ocl::core::transpose_oclsrc,
                   format("-D T=%s -D TILE_DIM=%d -D BLOCK_ROWS=%d",
                          ocl::memopTypeToStr(type), TILE_DIM, BLOCK_ROWS));
+    if (k.empty())
+        return false;
+
     if (inplace)
         k.args(ocl::KernelArg::ReadWriteNoSize(dst), dst.rows);
     else