Adding of user-defined type conversions for python bindings inside module directories

Adding of destructor and placement new constructors for classes wrapped with CV_EXPORTS_W_SIMPLE macro

modules/flann/misc/python/pyopencv_flann.hpp

@@ -0,0 +1,79 @@
+#ifdef HAVE_OPENCV_FLANN
+typedef cvflann::flann_distance_t cvflann_flann_distance_t;
+typedef cvflann::flann_algorithm_t cvflann_flann_algorithm_t;
+
+template<>
+PyObject* pyopencv_from(const cvflann_flann_algorithm_t& value)
+{
+    return PyInt_FromLong(int(value));
+}
+
+template<>
+PyObject* pyopencv_from(const cvflann_flann_distance_t& value)
+{
+    return PyInt_FromLong(int(value));
+}
+
+template<>
+bool pyopencv_to(PyObject *o, cv::flann::IndexParams& p, const char *name)
+{
+    (void)name;
+    bool ok = true;
+    PyObject* key = NULL;
+    PyObject* item = NULL;
+    Py_ssize_t pos = 0;
+
+    if(PyDict_Check(o)) {
+        while(PyDict_Next(o, &pos, &key, &item)) {
+            if( !PyString_Check(key) ) {
+                ok = false;
+                break;
+            }
+
+            String k = PyString_AsString(key);
+            if( PyString_Check(item) )
+            {
+                const char* value = PyString_AsString(item);
+                p.setString(k, value);
+            }
+            else if( !!PyBool_Check(item) )
+                p.setBool(k, item == Py_True);
+            else if( PyInt_Check(item) )
+            {
+                int value = (int)PyInt_AsLong(item);
+                if( strcmp(k.c_str(), "algorithm") == 0 )
+                    p.setAlgorithm(value);
+                else
+                    p.setInt(k, value);
+            }
+            else if( PyFloat_Check(item) )
+            {
+                double value = PyFloat_AsDouble(item);
+                p.setDouble(k, value);
+            }
+            else
+            {
+                ok = false;
+                break;
+            }
+        }
+    }
+
+    return ok && !PyErr_Occurred();
+}
+
+template<>
+bool pyopencv_to(PyObject* obj, cv::flann::SearchParams & value, const char * name)
+{
+    return pyopencv_to<cv::flann::IndexParams>(obj, value, name);
+}
+
+template<>
+bool pyopencv_to(PyObject *o, cvflann::flann_distance_t& dist, const char *name)
+{
+    int d = (int)dist;
+    bool ok = pyopencv_to(o, d, name);
+    dist = (cvflann::flann_distance_t)d;
+    return ok;
+}
+#endif