Merge pull request #16745 from Volskig:mp/ocv-gapi-standalone-size

G-API: Unification of own:: structures with cv:: (Size, Point, Rect)

* deowned Size Rect Point

* Deownded Size Rect Point

* With Scalar

modules/gapi/src/api/gbackend.cpp

@@ -395,7 +395,7 @@ void createMat(const cv::GMatDesc &desc, cv::gapi::own::Mat& mat)
     if (desc.dims.empty())
     {
         const auto type = desc.planar ? desc.depth : CV_MAKETYPE(desc.depth, desc.chan);
-        const auto size = desc.planar ? cv::gapi::own::Size{desc.size.width, desc.size.height*desc.chan}
+        const auto size = desc.planar ? cv::Size{desc.size.width, desc.size.height*desc.chan}
                                       : desc.size;
         mat.create(size, type);
     }
@@ -414,7 +414,7 @@ void createMat(const cv::GMatDesc &desc, cv::Mat& mat)
     {
         const auto type = desc.planar ? desc.depth : CV_MAKETYPE(desc.depth, desc.chan);
         const auto size = desc.planar ? cv::Size{desc.size.width, desc.size.height*desc.chan}
-                                      : cv::gapi::own::to_ocv(desc.size);
+                                      : desc.size;
         mat.create(size, type);
     }
     else

modules/gapi/src/api/gmat.cpp

@@ -10,7 +10,6 @@
 #include <ade/util/iota_range.hpp>
 #include <ade/util/algorithm.hpp>
 
-#include <opencv2/gapi/opencv_includes.hpp>
 #include <opencv2/gapi/own/mat.hpp> //gapi::own::Mat
 #include <opencv2/gapi/gmat.hpp>