Merge pull request #18339 from rgarnov:rg/rmat_integration

[GAPI] RMat integration into the framework

* RMat integration

* Added initialization of input mat in GArray initialization tests

* Fixed klocwork warnings in RMat tests, changed argument order in EXPECT_EQ

modules/gapi/src/compiler/gislandmodel.cpp

@@ -18,6 +18,7 @@
 #include "compiler/gmodel.hpp"
 #include "compiler/gislandmodel.hpp"
 #include "compiler/gmodel.hpp"
+#include "backends/common/gbackend.hpp" // RMatAdapter
 
 #include "logger.hpp"    // GAPI_LOG
 
@@ -348,7 +349,7 @@ void GIslandExecutable::run(GIslandExecutable::IInput &in, GIslandExecutable::IO
         switch (in_data_orig.index())
         {
         case cv::GRunArg::index_of<cv::Mat>():
-            in_data = cv::GRunArg{cv::util::get<cv::Mat>(in_data_orig)};
+            in_data = cv::GRunArg{cv::make_rmat<cv::gimpl::RMatAdapter>(cv::util::get<cv::Mat>(in_data_orig))};
             break;
         case cv::GRunArg::index_of<cv::Scalar>():
             in_data = cv::GRunArg{(cv::util::get<cv::Scalar>(in_data_orig))};

modules/gapi/src/compiler/gislandmodel.hpp

@@ -22,7 +22,6 @@
 
 namespace cv { namespace gimpl {
 
-
 // FIXME: GAPI_EXPORTS only because of tests!
 class GAPI_EXPORTS GIsland
 {
@@ -122,6 +121,8 @@ public:
 
     virtual bool canReshape() const = 0;
     virtual void reshape(ade::Graph& g, const GCompileArgs& args) = 0;
+    virtual bool allocatesOutputs() const { return false; }
+    virtual cv::RMat allocate(const cv::GMatDesc&) const { GAPI_Assert(false && "should never be called"); }
 
     // This method is called when the GStreamingCompiled gets a new
     // input source to process. Normally this method is called once