Merge pull request #20705 from TolyaTalamanov:at/handle-reshape-in-gexecutor

G-API: Handle reshape for generic case in GExecutor

* Handle reshape for generic case for GExecutor

* Add initResources

* Add tests

* Refactor reshape method

modules/gapi/src/executor/gexecutor.cpp

@@ -7,8 +7,6 @@
 
 #include "precomp.hpp"
 
-#include <iostream>
-
 #include <ade/util/zip_range.hpp>
 
 #include <opencv2/gapi/opencv_includes.hpp>
@@ -411,7 +409,8 @@ bool cv::gimpl::GExecutor::canReshape() const
 {
     // FIXME: Introduce proper reshaping support on GExecutor level
     // for all cases!
-    return (m_ops.size() == 1) && m_ops[0].isl_exec->canReshape();
+    return std::all_of(m_ops.begin(), m_ops.end(),
+                       [](const OpDesc& op) { return op.isl_exec->canReshape(); });
 }
 
 void cv::gimpl::GExecutor::reshape(const GMetaArgs& inMetas, const GCompileArgs& args)
@@ -421,7 +420,17 @@ void cv::gimpl::GExecutor::reshape(const GMetaArgs& inMetas, const GCompileArgs&
     ade::passes::PassContext ctx{g};
     passes::initMeta(ctx, inMetas);
     passes::inferMeta(ctx, true);
-    m_ops[0].isl_exec->reshape(g, args);
+
+    // NB: Before reshape islands need to re-init resources for every slot.
+    for (auto slot : m_slots)
+    {
+        initResource(slot.slot_nh, slot.data_nh);
+    }
+
+    for (auto& op : m_ops)
+    {
+        op.isl_exec->reshape(g, args);
+    }
 }
 
 void cv::gimpl::GExecutor::prepareForNewStream()