Merge pull request opencv#18332 from TolyaTalamanov:at/wrap-GIn-GOut

[G-API] Wrap GIn & GOut

* Wrap GIn & GOut into python

* Remove extra brackets

* Use reinterpret_cast

Author: TolyaTalamanov

modules/gapi/include/opencv2/gapi/gcomputation.hpp

@@ -161,8 +161,8 @@ class GAPI_EXPORTS_W GComputation
      *
      * @sa @ref gapi_data_objects
      */
-    GComputation(GProtoInputArgs &&ins,
-                 GProtoOutputArgs &&outs);             // Arg-to-arg overload
+    GAPI_WRAP GComputation(GProtoInputArgs &&ins,
+                           GProtoOutputArgs &&outs);             // Arg-to-arg overload
 
     // 2. Syntax sugar and compatibility overloads
     /**

modules/gapi/include/opencv2/gapi/gproto.hpp

@@ -57,6 +57,8 @@ template<class Tag>
 struct GIOProtoArgs
 {
 public:
+    // NB: Used by python wrapper
+    GIOProtoArgs() = default;
     explicit GIOProtoArgs(const GProtoArgs& args) : m_args(args) {}
     explicit GIOProtoArgs(GProtoArgs &&args)      : m_args(std::move(args)) {}
 

modules/gapi/misc/python/pyopencv_gapi.hpp

@@ -11,3 +11,35 @@ PyObject* pyopencv_from(const std::vector<GCompileArg>& value)
 {
     return pyopencv_from_generic_vec(value);
 }
+
+template <typename T>
+static PyObject* extract_proto_args(PyObject* py_args, PyObject* kw)
+{
+    using namespace cv;
+
+    GProtoArgs args;
+    Py_ssize_t size = PyTuple_Size(py_args);
+    for (int i = 0; i < size; ++i) {
+        PyObject* item = PyTuple_GetItem(py_args, i);
+        if (PyObject_TypeCheck(item, reinterpret_cast<PyTypeObject*>(pyopencv_GScalar_TypePtr))) {
+            args.emplace_back(reinterpret_cast<pyopencv_GScalar_t*>(item)->v);
+        } else if (PyObject_TypeCheck(item, reinterpret_cast<PyTypeObject*>(pyopencv_GMat_TypePtr))) {
+            args.emplace_back(reinterpret_cast<pyopencv_GMat_t*>(item)->v);
+        } else {
+            PyErr_SetString(PyExc_TypeError, "cv.GIn() supports only cv.GMat and cv.GScalar");
+            return NULL;
+        }
+    }
+
+    return pyopencv_from<T>(T{std::move(args)});
+}
+
+static PyObject* pyopencv_cv_GIn(PyObject* , PyObject* py_args, PyObject* kw)
+{
+    return extract_proto_args<GProtoInputArgs>(py_args, kw);
+}
+
+static PyObject* pyopencv_cv_GOut(PyObject* , PyObject* py_args, PyObject* kw)
+{
+    return extract_proto_args<GProtoOutputArgs>(py_args, kw);
+}

modules/gapi/misc/python/shadow_gapi.hpp

@@ -4,4 +4,10 @@
 namespace cv
 {
    GAPI_EXPORTS_W GCompileArgs compile_args(gapi::GKernelPackage pkg);
+   class GAPI_EXPORTS_W_SIMPLE GProtoArg { };
+   class GAPI_EXPORTS_W_SIMPLE GProtoInputArgs { };
+   class GAPI_EXPORTS_W_SIMPLE GProtoOutputArgs { };
+
+   using GProtoInputArgs  = GIOProtoArgs<In_Tag>;
+   using GProtoOutputArgs = GIOProtoArgs<Out_Tag>;
 } // namespace cv

modules/gapi/misc/python/test/test_gapi_core.py

@@ -30,7 +30,7 @@ def test_add(self):
         g_in1 = cv.GMat()
         g_in2 = cv.GMat()
         g_out = cv.gapi.add(g_in1, g_in2)
-        comp = cv.GComputation(g_in1, g_in2, g_out)
+        comp = cv.GComputation(cv.GIn(g_in1, g_in2), cv.GOut(g_out))
 
         for pkg in pkgs:
             actual = comp.apply(in1, in2, args=cv.compile_args(pkg))

modules/python/src2/cv2.cpp

@@ -1891,7 +1891,6 @@ static int convert_to_char(PyObject *o, char *dst, const ArgInfo& info)
 
 
 #include "pyopencv_generated_enums.h"
-#include "pyopencv_custom_headers.h"
 
 #ifdef CVPY_DYNAMIC_INIT
 #define CVPY_TYPE(NAME, STORAGE, SNAME, _1, _2) CVPY_TYPE_DECLARE_DYNAMIC(NAME, STORAGE, SNAME)
@@ -1900,6 +1899,7 @@ static int convert_to_char(PyObject *o, char *dst, const ArgInfo& info)
 #endif
 #include "pyopencv_generated_types.h"
 #undef CVPY_TYPE
+#include "pyopencv_custom_headers.h"
 
 #include "pyopencv_generated_types_content.h"
 #include "pyopencv_generated_funcs.h"
@@ -1915,6 +1915,10 @@ static PyMethodDef special_methods[] = {
 #ifdef HAVE_OPENCV_DNN
   {"dnn_registerLayer", CV_PY_FN_WITH_KW(pyopencv_cv_dnn_registerLayer), "registerLayer(type, class) -> None"},
   {"dnn_unregisterLayer", CV_PY_FN_WITH_KW(pyopencv_cv_dnn_unregisterLayer), "unregisterLayer(type) -> None"},
+#endif
+#ifdef HAVE_OPENCV_GAPI
+  {"GIn", CV_PY_FN_WITH_KW(pyopencv_cv_GIn), "GIn(...) -> GInputProtoArgs"},
+  {"GOut", CV_PY_FN_WITH_KW(pyopencv_cv_GOut), "GOut(...) -> GOutputProtoArgs"},
 #endif
   {NULL, NULL},
 };