Merge pull request #21041 from sivanov-work:gin_gout_concept

G-API: GAPI introduce compile guard for some types for gin/gout params passing

* Initial for taged solution

* Move out tags to gtags.hpp & add protection for own::Mat

* Add compile guard to proper place

* Fix MACRO concat

* Add unit tests

* Remove class MACRO injection due to Python3

* Revert back unproper changes

* Apply comments: reuse shape from traits

* Throw away unused gtags

* Apply comments

* Handle own::*

* Fix test

* Fix test(1)

* Fix unix build

* Try on type list

* Apply comments

* Apply comments

* Fix warning

modules/gapi/include/opencv2/gapi/gtype_traits.hpp

@@ -19,11 +19,25 @@
 #include <opencv2/gapi/streaming/source.hpp>
 #include <opencv2/gapi/media.hpp>
 #include <opencv2/gapi/gcommon.hpp>
+#include <opencv2/gapi/util/util.hpp>
+#include <opencv2/gapi/own/convert.hpp>
 
 namespace cv
 {
 namespace detail
 {
+    template<typename, typename = void>
+    struct contains_shape_field : std::false_type {};
+
+    template<typename TaggedTypeCandidate>
+    struct contains_shape_field<TaggedTypeCandidate,
+                                void_t<decltype(TaggedTypeCandidate::shape)>> :
+        std::is_same<typename std::decay<decltype(TaggedTypeCandidate::shape)>::type, GShape>
+    {};
+
+    template<typename Type>
+    struct has_gshape : contains_shape_field<Type> {};
+
     // FIXME: These traits and enum and possible numerous switch(kind)
     // block may be replaced with a special Handler<T> object or with
     // a double dispatch
@@ -181,10 +195,16 @@ namespace detail
         }
         template<typename U> static auto wrap_in (const U &u) -> typename GTypeTraits<T>::strip_type
         {
+            static_assert(!(cv::detail::has_gshape<GTypeTraits<U>>::value
+                            || cv::detail::contains<typename std::decay<U>::type, GAPI_OWN_TYPES_LIST>::value),
+                          "gin/gout must not be used with G* classes or cv::gapi::own::*");
             return GTypeTraits<T>::wrap_in(u);
         }
         template<typename U> static auto wrap_out(U &u) -> typename GTypeTraits<T>::strip_type
         {
+            static_assert(!(cv::detail::has_gshape<GTypeTraits<U>>::value
+                            || cv::detail::contains<typename std::decay<U>::type, GAPI_OWN_TYPES_LIST>::value),
+                          "gin/gout must not be used with G* classses or cv::gapi::own::*");
             return GTypeTraits<T>::wrap_out(u);
         }
     };

modules/gapi/include/opencv2/gapi/opencv_includes.hpp

@@ -14,6 +14,12 @@
 #  include <opencv2/core/cvdef.h>
 #  include <opencv2/core/types.hpp>
 #  include <opencv2/core/base.hpp>
+#define GAPI_OWN_TYPES_LIST     cv::gapi::own::Rect,                           \
+                                cv::gapi::own::Size,                           \
+                                cv::gapi::own::Point,                          \
+                                cv::gapi::own::Point2f,                        \
+                                cv::gapi::own::Scalar,                         \
+                                cv::gapi::own::Mat
 #else   // Without OpenCV
 #  include <opencv2/gapi/own/cvdefs.hpp>
 #  include <opencv2/gapi/own/types.hpp>  // cv::gapi::own::Rect/Size/Point
@@ -28,6 +34,8 @@ namespace cv {
     using Scalar  = gapi::own::Scalar;
     using Mat     = gapi::own::Mat;
 }  // namespace cv
+#define GAPI_OWN_TYPES_LIST     cv::gapi::own::VoidType
+
 #endif // !defined(GAPI_STANDALONE)
 
 #endif // OPENCV_GAPI_OPENCV_INCLUDES_HPP

modules/gapi/include/opencv2/gapi/own/types.hpp

@@ -143,6 +143,7 @@ inline std::ostream& operator<<(std::ostream& o, const Size& s)
     return o;
 }
 
+struct VoidType {};
 } // namespace own
 } // namespace gapi
 } // namespace cv

modules/gapi/include/opencv2/gapi/util/util.hpp

@@ -116,6 +116,13 @@ namespace detail
         using type = std::tuple<Objs...>;
         static type get(std::tuple<Objs...>&& objs) { return std::forward<std::tuple<Objs...>>(objs); }
     };
+
+    template<typename... Ts>
+    struct make_void { typedef void type;};
+
+    template<typename... Ts>
+    using void_t = typename make_void<Ts...>::type;
+
 } // namespace detail
 
 namespace util

modules/gapi/test/gapi_util_tests.cpp

@@ -4,13 +4,32 @@
 //
 // Copyright (C) 2018 Intel Corporation
 
-
-#include "test_precomp.hpp"
-
 #include <type_traits>
-
+#include "test_precomp.hpp"
+#include <opencv2/gapi/gtype_traits.hpp>
 #include <opencv2/gapi/util/util.hpp>
 
+namespace cv
+{
+struct Own {};
+namespace gapi
+{
+namespace own
+{
+struct ConvertibleToOwn{};
+struct NotConvertibleToOwn{};
+} // own
+} // gapi
+} // cv
+
+struct NoGhape {};
+struct HasGShape {
+    static constexpr cv::GShape shape = cv::GShape::GFRAME;
+};
+struct MimicGShape {
+     static constexpr int shape = 0;
+};
+#define DISALLOWED_LIST  cv::gapi::own::NotConvertibleToOwn
 namespace opencv_test
 {
 
@@ -40,4 +59,17 @@ TEST(GAPIUtil, AllButLast)
                   "[int, float] are NOT all integral types");
 }
 
+TEST(GAPIUtil, GShaped)
+{
+    static_assert(!cv::detail::has_gshape<NoGhape>::value, "NoGhape hasn't got any shape");
+    static_assert(cv::detail::has_gshape<HasGShape>::value, "HasGShape has got GShape shape");
+    static_assert(!cv::detail::has_gshape<MimicGShape>::value, "MimicGShape hasn't got right shape");
+}
+
+TEST(GAPIUtil, GTypeList)
+{
+    static_assert(cv::detail::contains<cv::gapi::own::NotConvertibleToOwn, GAPI_OWN_TYPES_LIST, DISALLOWED_LIST>::value, "NotConvertibleToOwn is in denial list");
+    static_assert(!cv::detail::contains<cv::gapi::own::ConvertibleToOwn>::value, "ConvertibleToOwn is not in empty denial list");
+    static_assert(!cv::detail::contains<cv::gapi::own::ConvertibleToOwn, GAPI_OWN_TYPES_LIST, DISALLOWED_LIST>::value, "ConvertibleToOwn is not in denial list");
+}
 } // namespace opencv_test

modules/gapi/test/internal/gapi_int_gmetaarg_test.cpp

@@ -138,22 +138,18 @@ TEST(GMetaArg, Can_Describe_RunArg)
     cv::Mat m(3, 3, CV_8UC3);
     cv::UMat um(3, 3, CV_8UC3);
     cv::Scalar s;
-    constexpr int w = 3, h = 3, c = 3;
-    uchar data[w*h*c];
-    cv::gapi::own::Mat om(h, w, CV_8UC3, data);
     cv::Scalar os;
     std::vector<int> v;
 
     GMetaArgs metas = {GMetaArg(descr_of(m)),
                        GMetaArg(descr_of(um)),
                        GMetaArg(descr_of(s)),
-                       GMetaArg(descr_of(om)),
                        GMetaArg(descr_of(os)),
                        GMetaArg(descr_of(v))};
 
-    auto in_run_args = cv::gin(m, um, s, om, os, v);
+    auto in_run_args = cv::gin(m, um, s, os, v);
 
-    for (int i = 0; i < 3; i++) {
+    for (size_t i = 0; i < metas.size(); i++) {
         EXPECT_TRUE(can_describe(metas[i], in_run_args[i]));
     }
 }
@@ -178,22 +174,18 @@ TEST(GMetaArg, Can_Describe_RunArgP)
     cv::Mat m(3, 3, CV_8UC3);
     cv::UMat um(3, 3, CV_8UC3);
     cv::Scalar s;
-    constexpr int w = 3, h = 3, c = 3;
-    uchar data[w*h*c];
-    cv::gapi::own::Mat om(h, w, CV_8UC3, data);
     cv::Scalar os;
     std::vector<int> v;
 
     GMetaArgs metas = {GMetaArg(descr_of(m)),
                        GMetaArg(descr_of(um)),
                        GMetaArg(descr_of(s)),
-                       GMetaArg(descr_of(om)),
                        GMetaArg(descr_of(os)),
                        GMetaArg(descr_of(v))};
 
-    auto out_run_args = cv::gout(m, um, s, om, os, v);
+    auto out_run_args = cv::gout(m, um, s, os, v);
 
-    for (int i = 0; i < 3; i++) {
+    for (size_t i = 0; i < metas.size(); i++) {
         EXPECT_TRUE(can_describe(metas[i], out_run_args[i]));
     }
 }

modules/gapi/test/internal/gapi_int_proto_tests.cpp

@@ -15,7 +15,6 @@ struct ProtoPtrTest : public ::testing::Test { using Type = T; };
 
 using ProtoPtrTestTypes = ::testing::Types< cv::Mat
                                           , cv::UMat
-                                          , cv::gapi::own::Mat
                                           , cv::RMat
                                           , cv::Scalar
                                           , std::vector<int>