initial shared pointer implementation for Viz3d, singleton VizAccessor, cv::viz::get function initial implementation

modules/viz/include/opencv2/viz.hpp

@@ -58,13 +58,17 @@
 namespace cv
 {
     namespace viz
-    {
+    {   
+        typedef std::map<String, Viz3d> VizMap;
+        typedef std::pair<String, Viz3d> VizPair;
+        
         //! takes coordiante frame data and builds transfrom to global coordinate frame
         CV_EXPORTS Affine3f makeTransformToGlobal(const Vec3f& axis_x, const Vec3f& axis_y, const Vec3f& axis_z, const Vec3f& origin = Vec3f::all(0));
 
         //! constructs camera pose from position, focal_point and up_vector (see gluLookAt() for more infromation
         CV_EXPORTS Affine3f makeCameraPose(const Vec3f& position, const Vec3f& focal_point, const Vec3f& y_dir);
 
+        CV_EXPORTS Viz3d get(const String &window_name);
 
         //! checks float value for Nan
         inline bool isNan(float x)
@@ -87,6 +91,24 @@ namespace cv
         //! checks point for Nans
         template<typename _Tp> inline bool isNan(const Point3_<_Tp>& p)
         { return isNan(p.x) || isNan(p.y) || isNan(p.z); }
+        
+        class CV_EXPORTS VizAccessor
+        {
+        public:
+            ~VizAccessor();
+            static VizAccessor * getInstance();
+            
+            Viz3d get(const String &window_name);
+            void add(Viz3d window);
+            void remove(const String &window_name);
+            
+        private:
+            VizAccessor(); // Singleton
+            
+            static VizAccessor * instance_;
+            static bool is_instantiated_;
+            static VizMap viz_map_;
+        };
     }
 }
 

modules/viz/include/opencv2/viz/viz3d.hpp

@@ -21,6 +21,8 @@ namespace cv
             typedef void (*MouseCallback)(const MouseEvent&, void*);
 
             Viz3d(const String& window_name = String());
+            Viz3d(const Viz3d&);
+            Viz3d& operator=(const Viz3d&);
             ~Viz3d();
 
             void setBackgroundColor(const Color& color = Color::black());
@@ -50,6 +52,8 @@ namespace cv
             
             Size getWindowSize() const;
             void setWindowSize(const Size &window_size);
+            
+            String getWindowName() const;
 
             void spin();
             void spinOnce(int time = 1, bool force_redraw = false);
@@ -58,11 +62,12 @@ namespace cv
             void registerKeyboardCallback(KeyboardCallback callback, void* cookie = 0);
             void registerMouseCallback(MouseCallback callback, void* cookie = 0);
         private:
-            Viz3d(const Viz3d&);
-            Viz3d& operator=(const Viz3d&);
 
             struct VizImpl;
             VizImpl* impl_;
+            
+            void create(const String &window_name);
+            void release();
         };
 
     } /* namespace viz */

modules/viz/src/viz.cpp

@@ -85,3 +85,58 @@ namespace cv
         }
     }
 }
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+/// Viz accessor implementation
+
+cv::viz::VizAccessor * cv::viz::VizAccessor::instance_ = 0;
+bool cv::viz::VizAccessor::is_instantiated_ = false;
+cv::viz::VizMap cv::viz::VizAccessor::viz_map_;
+
+cv::viz::VizAccessor::VizAccessor() {}
+
+cv::viz::VizAccessor::~VizAccessor()
+{
+    is_instantiated_ = false;
+}
+
+cv::viz::VizAccessor * cv::viz::VizAccessor::getInstance()
+{
+    if (is_instantiated_)
+    {
+        std::cout << "HERE" << std::endl;
+        instance_ = new VizAccessor();
+        is_instantiated_ = true;
+    }
+    return instance_;
+}
+
+cv::viz::Viz3d cv::viz::VizAccessor::get(const String & window_name)
+{
+    VizMap::iterator vm_itr = viz_map_.find(window_name);
+    bool exists = vm_itr != viz_map_.end();
+    if (exists) return vm_itr->second;
+    else return viz_map_.insert(VizPair(window_name, Viz3d(window_name))).first->second;
+}
+
+void cv::viz::VizAccessor::add(Viz3d window)
+{
+    String window_name = window.getWindowName();
+    VizMap::iterator vm_itr = viz_map_.find(window_name);
+    bool exists = vm_itr != viz_map_.end();
+    if (exists) return ;
+    viz_map_.insert(std::pair<String,Viz3d>(window_name, window));
+}
+
+void cv::viz::VizAccessor::remove(const String &window_name)
+{
+    VizMap::iterator vm_itr = viz_map_.find(window_name);
+    bool exists = vm_itr != viz_map_.end();
+    if (!exists) return ;
+    viz_map_.erase(vm_itr);
+}
+
+cv::viz::Viz3d cv::viz::get(const String &window_name)
+{
+    return cv::viz::VizAccessor::getInstance()->get(window_name);
+}

modules/viz/src/viz3d.cpp

@@ -2,8 +2,44 @@
 #include "viz3d_impl.hpp"
 
 
-cv::viz::Viz3d::Viz3d(const String& window_name) : impl_(new VizImpl(window_name)) {}
-cv::viz::Viz3d::~Viz3d() { delete impl_; }
+cv::viz::Viz3d::Viz3d(const String& window_name) : impl_(0) { create(window_name); }
+
+cv::viz::Viz3d::Viz3d(const Viz3d& other) : impl_(other.impl_) 
+{
+    if (impl_) CV_XADD(&impl_->ref_counter, 1);
+}
+
+cv::viz::Viz3d& cv::viz::Viz3d::operator=(const Viz3d& other)
+{
+    if (this != &other)
+    {
+        release();
+        impl_ = other.impl_;
+        if (impl_) CV_XADD(&impl_->ref_counter, 1);
+    }
+    return *this;
+}
+
+cv::viz::Viz3d::~Viz3d() { release(); }
+
+void cv::viz::Viz3d::create(const String &window_name)
+{
+    if (impl_) release();
+    impl_ = new VizImpl(window_name);
+    impl_->ref_counter = 1;
+    // Register the window
+//     cv::viz::VizAccessor::getInstance()->add(*this);
+}
+
+void cv::viz::Viz3d::release()
+{
+    if (impl_ && CV_XADD(&impl_->ref_counter, -1) == 1)
+    {
+        cv::viz::VizAccessor::getInstance()->remove(getWindowName());
+        delete impl_;
+        impl_ = 0;
+    }
+}
 
 void cv::viz::Viz3d::setBackgroundColor(const Color& color) { impl_->setBackgroundColor(color); }
 
@@ -55,4 +91,5 @@ void cv::viz::Viz3d::convertToWindowCoordinates(const Point3d &pt, Point3d &wind
 void cv::viz::Viz3d::converTo3DRay(const Point3d &window_coord, Point3d &origin, Vec3d &direction) { impl_->converTo3DRay(window_coord, origin, direction); }
 
 cv::Size cv::viz::Viz3d::getWindowSize() const { return impl_->getWindowSize(); }
-void cv::viz::Viz3d::setWindowSize(const Size &window_size) { impl_->setWindowSize(window_size.width, window_size.height); }
+void cv::viz::Viz3d::setWindowSize(const Size &window_size) { impl_->setWindowSize(window_size.width, window_size.height); }
+cv::String cv::viz::Viz3d::getWindowName() const { return impl_->getWindowName(); }

modules/viz/src/viz3d_impl.cpp

@@ -86,7 +86,7 @@ cv::viz::Viz3d::VizImpl::~VizImpl ()
     if (interactor_ != NULL)
         interactor_->DestroyTimer (timer_id_);
 
-    renderer_->Clear();
+    if (renderer_) renderer_->Clear();
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////
@@ -968,6 +968,11 @@ void cv::viz::Viz3d::VizImpl::setWindowName (const std::string &name)
         window_->SetWindowName (name.c_str ());
 }
 
+cv::String cv::viz::Viz3d::VizImpl::getWindowName() const
+{
+    return (window_ ? window_->GetWindowName() : "");
+}
+
 void cv::viz::Viz3d::VizImpl::setWindowPosition (int x, int y) { window_->SetPosition (x, y); }
 void cv::viz::Viz3d::VizImpl::setWindowSize (int xw, int yw) { window_->SetSize (xw, yw); }
 cv::Size cv::viz::Viz3d::VizImpl::getWindowSize() const { return Size(window_->GetSize()[0], window_->GetSize()[1]); }

modules/viz/src/viz3d_impl.hpp

@@ -11,6 +11,8 @@ public:
     typedef cv::Ptr<VizImpl> Ptr;
     typedef Viz3d::KeyboardCallback KeyboardCallback;
     typedef Viz3d::MouseCallback MouseCallback;
+    
+    int ref_counter;
 
     VizImpl (const String &name);
     virtual ~VizImpl ();
@@ -142,6 +144,7 @@ public:
     void setWindowSize (int xw, int yw);
     void setFullScreen (bool mode);
     void setWindowName (const String &name);
+    String getWindowName() const;
     void setBackgroundColor (const Color& color);
 
     void spin ();