Merge pull request #14648 from smirnov-alexey:as/gapi_transform

* Introduce GAPI_TRANSFORM initial interface

Comes along with simple tests and kernel package changes

* Fix documentation and adjust combine() function

* Fix stuff after rebasing on master

* Remove redundant functionality

* Refactoring according to review feedback provided

* Fixes according to review feedback

* Reconsider transformations return and fix a warning

* Fixes from code review

* Add a new simple test

* Cleanup, added tests on GScalar, GMatP, GArray

modules/gapi/src/api/gkernel.cpp

@@ -2,7 +2,7 @@
 // It is subject to the license terms in the LICENSE file found in the top-level directory
 // of this distribution and at http://opencv.org/license.html.
 //
-// Copyright (C) 2018 Intel Corporation
+// Copyright (C) 2018-2019 Intel Corporation
 
 
 #include "precomp.hpp"
@@ -50,6 +50,11 @@ std::size_t cv::gapi::GKernelPackage::size() const
     return m_id_kernels.size();
 }
 
+const std::vector<cv::GTransform> &cv::gapi::GKernelPackage::get_transformations() const
+{
+    return m_transformations;
+}
+
 cv::gapi::GKernelPackage cv::gapi::combine(const GKernelPackage  &lhs,
                                            const GKernelPackage  &rhs)
 {
@@ -66,6 +71,9 @@ cv::gapi::GKernelPackage cv::gapi::combine(const GKernelPackage  &lhs,
                 result.m_id_kernels.emplace(kernel.first, kernel.second);
             }
         }
+        for (const auto &transforms : lhs.m_transformations){
+            result.m_transformations.push_back(transforms);
+        }
         return result;
 }
 

modules/gapi/src/compiler/passes/kernels.cpp

@@ -35,7 +35,7 @@ namespace
     // 1. Get GCompoundKernel implementation
     // 2. Create GCompoundContext
     // 3. Run GCompoundKernel with GCompoundContext
-    // 4. Build subgraph from imputs/outputs GCompoundKernel
+    // 4. Build subgraph from inputs/outputs GCompoundKernel
     // 5. Replace compound node to subgraph
 
     void expand(ade::Graph& g, ade::NodeHandle nh, const ImplInfo& impl_info)