Merge pull request #19982 from TolyaTalamanov:at/new-python-operation-api

G-API: New python operations API

* Reimplement test using decorators

* Custom python operation API

* Remove wip status

* python: support Python code in bindings (through loader only)

* cleanup, skip tests for Python 2.x (not supported)

* python 2.x can't skip unittest modules

* Clean up

* Clean up

* Fix segfault python3.9

Co-authored-by: Alexander Alekhin <alexander.a.alekhin@gmail.com>

modules/gapi/include/opencv2/gapi/core.hpp

@@ -1490,7 +1490,7 @@ enlarge an image, it will generally look best with cv::INTER_CUBIC (slow) or cv:
 
 @sa  warpAffine, warpPerspective, remap, resizeP
  */
-GAPI_EXPORTS GMat resize(const GMat& src, const Size& dsize, double fx = 0, double fy = 0, int interpolation = INTER_LINEAR);
+GAPI_EXPORTS_W GMat resize(const GMat& src, const Size& dsize, double fx = 0, double fy = 0, int interpolation = INTER_LINEAR);
 
 /** @brief Resizes a planar image.
 

modules/gapi/include/opencv2/gapi/gmat.hpp

@@ -120,7 +120,7 @@ struct GAPI_EXPORTS_W_SIMPLE GMatDesc
     // Meta combinator: return a new GMatDesc which differs in size by delta
     // (all other fields are taken unchanged from this GMatDesc)
     // FIXME: a better name?
-    GMatDesc withSizeDelta(cv::Size delta) const
+    GAPI_WRAP GMatDesc withSizeDelta(cv::Size delta) const
     {
         GMatDesc desc(*this);
         desc.size += delta;
@@ -130,12 +130,12 @@ struct GAPI_EXPORTS_W_SIMPLE GMatDesc
     // (all other fields are taken unchanged from this GMatDesc)
     //
     // This is an overload.
-    GMatDesc withSizeDelta(int dx, int dy) const
+    GAPI_WRAP GMatDesc withSizeDelta(int dx, int dy) const
     {
         return withSizeDelta(cv::Size{dx,dy});
     }
 
-    GMatDesc withSize(cv::Size sz) const
+    GAPI_WRAP GMatDesc withSize(cv::Size sz) const
     {
         GMatDesc desc(*this);
         desc.size = sz;
@@ -144,7 +144,7 @@ struct GAPI_EXPORTS_W_SIMPLE GMatDesc
 
     // Meta combinator: return a new GMatDesc with specified data depth.
     // (all other fields are taken unchanged from this GMatDesc)
-    GMatDesc withDepth(int ddepth) const
+    GAPI_WRAP GMatDesc withDepth(int ddepth) const
     {
         GAPI_Assert(CV_MAT_CN(ddepth) == 1 || ddepth == -1);
         GMatDesc desc(*this);
@@ -166,7 +166,7 @@ struct GAPI_EXPORTS_W_SIMPLE GMatDesc
     // Meta combinator: return a new GMatDesc with planar flag set
     // (no size changes are performed, only channel interpretation is changed
     // (interleaved -> planar)
-    GMatDesc asPlanar() const
+    GAPI_WRAP GMatDesc asPlanar() const
     {
         GAPI_Assert(planar == false);
         GMatDesc desc(*this);
@@ -177,7 +177,7 @@ struct GAPI_EXPORTS_W_SIMPLE GMatDesc
     // Meta combinator: return a new GMatDesc
     // reinterpreting 1-channel input as planar image
     // (size height is divided by plane number)
-    GMatDesc asPlanar(int planes) const
+    GAPI_WRAP GMatDesc asPlanar(int planes) const
     {
         GAPI_Assert(planar == false);
         GAPI_Assert(chan == 1);
@@ -192,7 +192,7 @@ struct GAPI_EXPORTS_W_SIMPLE GMatDesc
     // Meta combinator: return a new GMatDesc with planar flag set to false
     // (no size changes are performed, only channel interpretation is changed
     // (planar -> interleaved)
-    GMatDesc asInterleaved() const
+    GAPI_WRAP GMatDesc asInterleaved() const
     {
         GAPI_Assert(planar == true);
         GMatDesc desc(*this);

modules/gapi/include/opencv2/gapi/imgproc.hpp

@@ -1341,7 +1341,7 @@ Output image is 8-bit unsigned 3-channel image @ref CV_8UC3.
 @param src input image: 8-bit unsigned 3-channel image @ref CV_8UC3.
 @sa RGB2BGR
 */
-GAPI_EXPORTS GMat BGR2RGB(const GMat& src);
+GAPI_EXPORTS_W GMat BGR2RGB(const GMat& src);
 
 /** @brief Converts an image from RGB color space to gray-scaled.