text: /*
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   */
  
  /** \file
   * \ingroup freestyle
   */
  
  #include "BPy_Convert.h"
  
  #include "BPy_BBox.h"
  #include "BPy_FrsMaterial.h"
  #include "BPy_Id.h"
  #include "BPy_IntegrationType.h"
  #include "BPy_Interface0D.h"
  #include "Interface0D/BPy_CurvePoint.h"
  #include "Interface0D/CurvePoint/BPy_StrokeVertex.h"
  #include "Interface0D/BPy_SVertex.h"
  #include "Interface0D/BPy_ViewVertex.h"
  #include "Interface0D/ViewVertex/BPy_NonTVertex.h"
  #include "Interface0D/ViewVertex/BPy_TVertex.h"
  #include "BPy_Interface1D.h"
  #include "Interface1D/BPy_FEdge.h"
  #include "Interface1D/BPy_Stroke.h"
  #include "Interface1D/BPy_ViewEdge.h"
  #include "Interface1D/Curve/BPy_Chain.h"
  #include "Interface1D/FEdge/BPy_FEdgeSharp.h"
  #include "Interface1D/FEdge/BPy_FEdgeSmooth.h"
  #include "BPy_Nature.h"
  #include "BPy_MediumType.h"
  #include "BPy_SShape.h"
  #include "BPy_StrokeAttribute.h"
  #include "BPy_ViewShape.h"
  
  #include "Iterator/BPy_AdjacencyIterator.h"
  #include "Iterator/BPy_ChainPredicateIterator.h"
  #include "Iterator/BPy_ChainSilhouetteIterator.h"
  #include "Iterator/BPy_ChainingIterator.h"
  #include "Iterator/BPy_CurvePointIterator.h"
  #include "Iterator/BPy_Interface0DIterator.h"
  #include "Iterator/BPy_SVertexIterator.h"
  #include "Iterator/BPy_StrokeVertexIterator.h"
  #include "Iterator/BPy_ViewEdgeIterator.h"
  #include "Iterator/BPy_orientedViewEdgeIterator.h"
  
  #include "../stroke/StrokeRep.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  ///////////////////////////////////////////////////////////////////////////////////////////
  
  //==============================
  // C++ => Python
  //==============================
  
  PyObject *PyBool_from_bool(bool b)
  {
    return PyBool_FromLong(b ? 1 : 0);
  }
  
  PyObject *Vector_from_Vec2f(Vec2f &vec)
  {
    float vec_data[2];  // because vec->_coord is protected
    vec_data[0] = vec.x();
    vec_data[1] = vec.y();
    return Vector_CreatePyObject(vec_data, 2, NULL);
  }
  
  PyObject *Vector_from_Vec3f(Vec3f &vec)
  {
    float vec_data[3];  // because vec->_coord is protected
    vec_data[0] = vec.x();
    vec_data[1] = vec.y();
    vec_data[2] = vec.z();
    return Vector_CreatePyObject(vec_data, 3, NULL);
  }
  
  PyObject *Vector_from_Vec3r(Vec3r &vec)
  {
    float vec_data[3];  // because vec->_coord is protected
    vec_data[0] = vec.x();
    vec_data[1] = vec.y();
    vec_data[2] = vec.z();
    return Vector_CreatePyObject(vec_data, 3, NULL);
  }
  
  PyObject *BPy_Id_from_Id(Id &id)
  {
    PyObject *py_id = Id_Type.tp_new(&Id_Type, 0, 0);
    ((BPy_Id *)py_id)->id = new Id(id.getFirst(), id.getSecond());
    return py_id;
  }
  
  PyObject *Any_BPy_Interface0D_from_Interface0D(Interface0D &if0D)
  {
    if (typeid(if0D) == typeid(CurvePoint)) {
      return BPy_CurvePoint_from_CurvePoint(dynamic_cast<CurvePoint &>(if0D));
    }
    else if (typeid(if0D) == typeid(StrokeVertex)) {
      return BPy_StrokeVertex_from_StrokeVertex(dynamic_cast<StrokeVertex &>(if0D));
    }
    else if (typeid(if0D) == typeid(SVertex)) {
      return BPy_SVertex_from_SVertex(dynamic_cast<SVertex &>(if0D));
    }
    else if (typeid(if0D) == typeid(ViewVertex)) {
      return BPy_ViewVertex_from_ViewVertex(dynamic_cast<ViewVertex &>(if0D));
    }
    else if (typeid(if0D) == typeid(NonTVertex)) {
      return BPy_NonTVertex_from_NonTVertex(dynamic_cast<NonTVertex &>(if0D));
    }
    else if (typeid(if0D) == typeid(TVertex)) {
      return BPy_TVertex_from_TVertex(dynamic_cast<TVertex &>(if0D));
    }
    else if (typeid(if0D) == typeid(Interface0D)) {
      return BPy_Interface0D_from_Interface0D(if0D);
    }
    string msg("unexpected type: " + if0D.getExactTypeName());
    PyErr_SetString(PyExc_TypeError, msg.c_str());
    return NULL;
  }
  
  PyObject *Any_BPy_Interface1D_from_Interface1D(Interface1D &if1D)
  {
    if (typeid(if1D) == typeid(ViewEdge)) {
      return BPy_ViewEdge_from_ViewEdge(dynamic_cast<ViewEdge &>(if1D));
    }
    else if (typeid(if1D) == typeid(Chain)) {
      return BPy_Chain_from_Chain(dynamic_cast<Chain &>(if1D));
    }
    else if (typeid(if1D) == typeid(Stroke)) {
      return BPy_Stroke_from_Stroke(dynamic_cast<Stroke &>(if1D));
    }
    else if (typeid(if1D) == typeid(FEdgeSharp)) {
      return BPy_FEdgeSharp_from_FEdgeSharp(dynamic_cast<FEdgeSharp &>(if1D));
    }
    else if (typeid(if1D) == typeid(FEdgeSmooth)) {
      return BPy_FEdgeSmooth_from_FEdgeSmooth(dynamic_cast<FEdgeSmooth &>(if1D));
    }
    else if (typeid(if1D) == typeid(FEdge)) {
      return BPy_FEdge_from_FEdge(dynamic_cast<FEdge &>(if1D));
    }
    else if (typeid(if1D) == typeid(Interface1D)) {
      return BPy_Interface1D_from_Interface1D(if1D);
    }
    string msg("unexpected type: " + if1D.getExactTypeName());
    PyErr_SetString(PyExc_TypeError, msg.c_str());
    return NULL;
  }
  
  PyObject *Any_BPy_FEdge_from_FEdge(FEdge &fe)
  {
    if (typeid(fe) == typeid(FEdgeSharp)) {
      return BPy_FEdgeSharp_from_FEdgeSharp(dynamic_cast<FEdgeSharp &>(fe));
    }
    else if (typeid(fe) == typeid(FEdgeSmooth)) {
      return BPy_FEdgeSmooth_from_FEdgeSmooth(dynamic_cast<FEdgeSmooth &>(fe));
    }
    else if (typeid(fe) == typeid(FEdge)) {
      return BPy_FEdge_from_FEdge(fe);
    }
    string msg("unexpected type: " + fe.getExactTypeName());
    PyErr_SetString(PyExc_TypeError, msg.c_str());
    return NULL;
  }
  
  PyObject *Any_BPy_ViewVertex_from_ViewVertex(ViewVertex &vv)
  {
    if (typeid(vv) == typeid(NonTVertex)) {
      return BPy_NonTVertex_from_NonTVertex(dynamic_cast<NonTVertex &>(vv));
    }
    else if (typeid(vv) == typeid(TVertex)) {
      return BPy_TVertex_from_TVertex(dynamic_cast<TVertex &>(vv));
    }
    else if (typeid(vv) == typeid(ViewVertex)) {
      return BPy_ViewVertex_from_ViewVertex(vv);
    }
    string msg("unexpected type: " + vv.getExactTypeName());
    PyErr_SetString(PyExc_TypeError, msg.c_str());
    return NULL;
  }
  
  PyObject *BPy_Interface0D_from_Interface0D(Interface0D &if0D)
  {
    PyObject *py_if0D = Interface0D_Type.tp_new(&Interface0D_Type, 0, 0);
    ((BPy_Interface0D *)py_if0D)->if0D = &if0D;
    ((BPy_Interface0D *)py_if0D)->borrowed = true;
    return py_if0D;
  }
  
  PyObject *BPy_Interface1D_from_Interface1D(Interface1D &if1D)
  {
    PyObject *py_if1D = Interface1D_Type.tp_new(&Interface1D_Type, 0, 0);
    ((BPy_Interface1D *)py_if1D)->if1D = &if1D;
    ((BPy_Interface1D *)py_if1D)->borrowed = true;
    return py_if1D;
  }
  
  PyObject *BPy_SVertex_from_SVertex(SVertex &sv)
  {
    PyObject *py_sv = SVertex_Type.tp_new(&SVertex_Type, 0, 0);
    ((BPy_SVertex *)py_sv)->sv = &sv;
    ((BPy_SVertex *)py_sv)->py_if0D.if0D = ((BPy_SVertex *)py_sv)->sv;
    ((BPy_SVertex *)py_sv)->py_if0D.borrowed = true;
    return py_sv;
  }
  
  PyObject *BPy_FEdgeSharp_from_FEdgeSharp(FEdgeSharp &fes)
  {
    PyObject *py_fe = FEdgeSharp_Type.tp_new(&FEdgeSharp_Type, 0, 0);
    ((BPy_FEdgeSharp *)py_fe)->fes = &fes;
    ((BPy_FEdgeSharp *)py_fe)->py_fe.fe = ((BPy_FEdgeSharp *)py_fe)->fes;
    ((BPy_FEdgeSharp *)py_fe)->py_fe.py_if1D.if1D = ((BPy_FEdgeSharp *)py_fe)->fes;
    ((BPy_FEdgeSharp *)py_fe)->py_fe.py_if1D.borrowed = true;
    return py_fe;
  }
  
  PyObject *BPy_FEdgeSmooth_from_FEdgeSmooth(FEdgeSmooth &fes)
  {
    PyObject *py_fe = FEdgeSmooth_Type.tp_new(&FEdgeSmooth_Type, 0, 0);
    ((BPy_FEdgeSmooth *)py_fe)->fes = &fes;
    ((BPy_FEdgeSmooth *)py_fe)->py_fe.fe = ((BPy_FEdgeSmooth *)py_fe)->fes;
    ((BPy_FEdgeSmooth *)py_fe)->py_fe.py_if1D.if1D = ((BPy_FEdgeSmooth *)py_fe)->fes;
    ((BPy_FEdgeSmooth *)py_fe)->py_fe.py_if1D.borrowed = true;
    return py_fe;
  }
  
  PyObject *BPy_FEdge_from_FEdge(FEdge &fe)
  {
    PyObject *py_fe = FEdge_Type.tp_new(&FEdge_Type, 0, 0);
    ((BPy_FEdge *)py_fe)->fe = &fe;
    ((BPy_FEdge *)py_fe)->py_if1D.if1D = ((BPy_FEdge *)py_fe)->fe;
    ((BPy_FEdge *)py_fe)->py_if1D.borrowed = true;
    return py_fe;
  }
  
  PyObject *BPy_Nature_from_Nature(unsigned short n)
  {
    PyObject *args = PyTuple_New(1);
    PyTuple_SET_ITEM(args, 0, PyLong_FromLong(n));
    PyObject *py_n = Nature_Type.tp_new(&Nature_Type, args, NULL);
    Py_DECREF(args);
    return py_n;
  }
  
  PyObject *BPy_Stroke_from_Stroke(Stroke &s)
  {
    PyObject *py_s = Stroke_Type.tp_new(&Stroke_Type, 0, 0);
    ((BPy_Stroke *)py_s)->s = &s;
    ((BPy_Stroke *)py_s)->py_if1D.if1D = ((BPy_Stroke *)py_s)->s;
    ((BPy_Stroke *)py_s)->py_if1D.borrowed = true;
    return py_s;
  }
  
  PyObject *BPy_StrokeAttribute_from_StrokeAttribute(StrokeAttribute &sa)
  {
    PyObject *py_sa = StrokeAttribute_Type.tp_new(&StrokeAttribute_Type, 0, 0);
    ((BPy_StrokeAttribute *)py_sa)->sa = &sa;
    ((BPy_StrokeAttribute *)py_sa)->borrowed = true;
    return py_sa;
  }
  
  PyObject *BPy_MediumType_from_MediumType(Stroke::MediumType n)
  {
    PyObject *args = PyTuple_New(1);
    PyTuple_SET_ITEM(args, 0, PyLong_FromLong(n));
    PyObject *py_mt = MediumType_Type.tp_new(&MediumType_Type, args, NULL);
    Py_DECREF(args);
    return py_mt;
  }
  
  PyObject *BPy_StrokeVertex_from_StrokeVertex(StrokeVertex &sv)
  {
    PyObject *py_sv = StrokeVertex_Type.tp_new(&StrokeVertex_Type, 0, 0);
    ((BPy_StrokeVertex *)py_sv)->sv = &sv;
    ((BPy_StrokeVertex *)py_sv)->py_cp.cp = ((BPy_StrokeVertex *)py_sv)->sv;
    ((BPy_StrokeVertex *)py_sv)->py_cp.py_if0D.if0D = ((BPy_StrokeVertex *)py_sv)->sv;
    ((BPy_StrokeVertex *)py_sv)->py_cp.py_if0D.borrowed = true;
    return py_sv;
  }
  
  PyObject *BPy_ViewVertex_from_ViewVertex(ViewVertex &vv)
  {
    PyObject *py_vv = ViewVertex_Type.tp_new(&ViewVertex_Type, 0, 0);
    ((BPy_ViewVertex *)py_vv)->vv = &vv;
    ((BPy_ViewVertex *)py_vv)->py_if0D.if0D = ((BPy_ViewVertex *)py_vv)->vv;
    ((BPy_ViewVertex *)py_vv)->py_if0D.borrowed = true;
    return py_vv;
  }
  
  PyObject *BPy_NonTVertex_from_NonTVertex(NonTVertex &ntv)
  {
    PyObject *py_ntv = NonTVertex_Type.tp_new(&NonTVertex_Type, 0, 0);
    ((BPy_NonTVertex *)py_ntv)->ntv = &ntv;
    ((BPy_NonTVertex *)py_ntv)->py_vv.vv = ((BPy_NonTVertex *)py_ntv)->ntv;
    ((BPy_NonTVertex *)py_ntv)->py_vv.py_if0D.if0D = ((BPy_NonTVertex *)py_ntv)->ntv;
    ((BPy_NonTVertex *)py_ntv)->py_vv.py_if0D.borrowed = true;
    return py_ntv;
  }
  
  PyObject *BPy_TVertex_from_TVertex(TVertex &tv)
  {
    PyObject *py_tv = TVertex_Type.tp_new(&TVertex_Type, 0, 0);
    ((BPy_TVertex *)py_tv)->tv = &tv;
    ((BPy_TVertex *)py_tv)->py_vv.vv = ((BPy_TVertex *)py_tv)->tv;
    ((BPy_TVertex *)py_tv)->py_vv.py_if0D.if0D = ((BPy_TVertex *)py_tv)->tv;
    ((BPy_TVertex *)py_tv)->py_vv.py_if0D.borrowed = true;
    return py_tv;
  }
  
  PyObject *BPy_BBox_from_BBox(const BBox<Vec3r> &bb)
  {
    PyObject *py_bb = BBox_Type.tp_new(&BBox_Type, 0, 0);
    ((BPy_BBox *)py_bb)->bb = new BBox<Vec3r>(bb);
    return py_bb;
  }
  
  PyObject *BPy_ViewEdge_from_ViewEdge(ViewEdge &ve)
  {
    PyObject *py_ve = ViewEdge_Type.tp_new(&ViewEdge_Type, 0, 0);
    ((BPy_ViewEdge *)py_ve)->ve = &ve;
    ((BPy_ViewEdge *)py_ve)->py_if1D.if1D = ((BPy_ViewEdge *)py_ve)->ve;
    ((BPy_ViewEdge *)py_ve)->py_if1D.borrowed = true;
    return py_ve;
  }
  
  PyObject *BPy_Chain_from_Chain(Chain &c)
  {
    PyObject *py_c = Chain_Type.tp_new(&Chain_Type, 0, 0);
    ((BPy_Chain *)py_c)->c = &c;
    ((BPy_Chain *)py_c)->py_c.c = ((BPy_Chain *)py_c)->c;
    ((BPy_Chain *)py_c)->py_c.py_if1D.if1D = ((BPy_Chain *)py_c)->c;
    ((BPy_Chain *)py_c)->py_c.py_if1D.borrowed = true;
    return py_c;
  }
  
  PyObject *BPy_SShape_from_SShape(SShape &ss)
  {
    PyObject *py_ss = SShape_Type.tp_new(&SShape_Type, 0, 0);
    ((BPy_SShape *)py_ss)->ss = &ss;
    ((BPy_SShape *)py_ss)->borrowed = true;
    return py_ss;
  }
  
  PyObject *BPy_ViewShape_from_ViewShape(ViewShape &vs)
  {
    PyObject *py_vs = ViewShape_Type.tp_new(&ViewShape_Type, 0, 0);
    ((BPy_ViewShape *)py_vs)->vs = &vs;
    ((BPy_ViewShape *)py_vs)->borrowed = true;
    ((BPy_ViewShape *)py_vs)->py_ss = NULL;
    return py_vs;
  }
  
  PyObject *BPy_FrsMaterial_from_FrsMaterial(const FrsMaterial &m)
  {
    PyObject *py_m = FrsMaterial_Type.tp_new(&FrsMaterial_Type, 0, 0);
    ((BPy_FrsMaterial *)py_m)->m = new FrsMaterial(m);
    return py_m;
  }
  
  PyObject *BPy_IntegrationType_from_IntegrationType(IntegrationType i)
  {
    PyObject *args = PyTuple_New(1);
    PyTuple_SET_ITEM(args, 0, PyLong_FromLong(i));
    PyObject *py_it = IntegrationType_Type.tp_new(&IntegrationType_Type, args, NULL);
    Py_DECREF(args);
    return py_it;
  }
  
  PyObject *BPy_CurvePoint_from_CurvePoint(CurvePoint &cp)
  {
    PyObject *py_cp = CurvePoint_Type.tp_new(&CurvePoint_Type, 0, 0);
    // CurvePointIterator::operator*() returns a reference of a class data
    // member whose value is mutable upon iteration over different CurvePoints.
    // It is likely that such a mutable reference is passed to this function,
    // so that a new allocated CurvePoint instance is created here to avoid
    // nasty bugs (cf. T41464).
    ((BPy_CurvePoint *)py_cp)->cp = new CurvePoint(cp);
    ((BPy_CurvePoint *)py_cp)->py_if0D.if0D = ((BPy_CurvePoint *)py_cp)->cp;
    ((BPy_CurvePoint *)py_cp)->py_if0D.borrowed = false;
    return py_cp;
  }
  
  PyObject *BPy_directedViewEdge_from_directedViewEdge(ViewVertex::directedViewEdge &dve)
  {
    PyObject *py_dve = PyTuple_New(2);
    PyTuple_SET_ITEMS(
        py_dve, BPy_ViewEdge_from_ViewEdge(*(dve.first)), PyBool_from_bool(dve.second));
    return py_dve;
  }
  
  //==============================
  // Iterators
  //==============================
  
  PyObject *BPy_AdjacencyIterator_from_AdjacencyIterator(AdjacencyIterator &a_it)
  {
    PyObject *py_a_it = AdjacencyIterator_Type.tp_new(&AdjacencyIterator_Type, 0, 0);
    ((BPy_AdjacencyIterator *)py_a_it)->a_it = new AdjacencyIterator(a_it);
    ((BPy_AdjacencyIterator *)py_a_it)->py_it.it = ((BPy_AdjacencyIterator *)py_a_it)->a_it;
    ((BPy_AdjacencyIterator *)py_a_it)->at_start = true;
    return py_a_it;
  }
  
  PyObject *BPy_Interface0DIterator_from_Interface0DIterator(Interface0DIterator &if0D_it,
                                                             bool reversed)
  {
    PyObject *py_if0D_it = Interface0DIterator_Type.tp_new(&Interface0DIterator_Type, 0, 0);
    ((BPy_Interface0DIterator *)py_if0D_it)->if0D_it = new Interface0DIterator(if0D_it);
    ((BPy_Interface0DIterator *)py_if0D_it)->py_it.it =
        ((BPy_Interface0DIterator *)py_if0D_it)->if0D_it;
    ((BPy_Interface0DIterator *)py_if0D_it)->at_start = true;
    ((BPy_Interface0DIterator *)py_if0D_it)->reversed = reversed;
    return py_if0D_it;
  }
  
  PyObject *BPy_CurvePointIterator_from_CurvePointIterator(CurveInternal::CurvePointIterator &cp_it)
  {
    PyObject *py_cp_it = CurvePointIterator_Type.tp_new(&CurvePointIterator_Type, 0, 0);
    ((BPy_CurvePointIterator *)py_cp_it)->cp_it = new CurveInternal::CurvePointIterator(cp_it);
    ((BPy_CurvePointIterator *)py_cp_it)->py_it.it = ((BPy_CurvePointIterator *)py_cp_it)->cp_it;
    return py_cp_it;
  }
  
  PyObject *BPy_StrokeVertexIterator_from_StrokeVertexIterator(
      StrokeInternal::StrokeVertexIterator &sv_it, bool reversed)
  {
    PyObject *py_sv_it = StrokeVertexIterator_Type.tp_new(&StrokeVertexIterator_Type, 0, 0);
    ((BPy_StrokeVertexIterator *)py_sv_it)->sv_it = new StrokeInternal::StrokeVertexIterator(sv_it);
    ((BPy_StrokeVertexIterator *)py_sv_it)->py_it.it = ((BPy_StrokeVertexIterator *)py_sv_it)->sv_it;
    ((BPy_StrokeVertexIterator *)py_sv_it)->at_start = true;
    ((BPy_StrokeVertexIterator *)py_sv_it)->reversed = reversed;
    return py_sv_it;
  }
  
  PyObject *BPy_SVertexIterator_from_SVertexIterator(ViewEdgeInternal::SVertexIterator &sv_it)
  {
    PyObject *py_sv_it = SVertexIterator_Type.tp_new(&SVertexIterator_Type, 0, 0);
    ((BPy_SVertexIterator *)py_sv_it)->sv_it = new ViewEdgeInternal::SVertexIterator(sv_it);
    ((BPy_SVertexIterator *)py_sv_it)->py_it.it = ((BPy_SVertexIterator *)py_sv_it)->sv_it;
    return py_sv_it;
  }
  
  PyObject *BPy_orientedViewEdgeIterator_from_orientedViewEdgeIterator(
      ViewVertexInternal::orientedViewEdgeIterator &ove_it, bool reversed)
  {
    PyObject *py_ove_it = orientedViewEdgeIterator_Type.tp_new(&orientedViewEdgeIterator_Type, 0, 0);
    ((BPy_orientedViewEdgeIterator *)py_ove_it)->ove_it =
        new ViewVertexInternal::orientedViewEdgeIterator(ove_it);
    ((BPy_orientedViewEdgeIterator *)py_ove_it)->py_it.it =
        ((BPy_orientedViewEdgeIterator *)py_ove_it)->ove_it;
    ((BPy_orientedViewEdgeIterator *)py_ove_it)->at_start = true;
    ((BPy_orientedViewEdgeIterator *)py_ove_it)->reversed = reversed;
    return py_ove_it;
  }
  
  PyObject *BPy_ViewEdgeIterator_from_ViewEdgeIterator(ViewEdgeInternal::ViewEdgeIterator &ve_it)
  {
    PyObject *py_ve_it = ViewEdgeIterator_Type.tp_new(&ViewEdgeIterator_Type, 0, 0);
    ((BPy_ViewEdgeIterator *)py_ve_it)->ve_it = new ViewEdgeInternal::ViewEdgeIterator(ve_it);
    ((BPy_ViewEdgeIterator *)py_ve_it)->py_it.it = ((BPy_ViewEdgeIterator *)py_ve_it)->ve_it;
    return py_ve_it;
  }
  
  PyObject *BPy_ChainingIterator_from_ChainingIterator(ChainingIterator &c_it)
  {
    PyObject *py_c_it = ChainingIterator_Type.tp_new(&ChainingIterator_Type, 0, 0);
    ((BPy_ChainingIterator *)py_c_it)->c_it = new ChainingIterator(c_it);
    ((BPy_ChainingIterator *)py_c_it)->py_ve_it.py_it.it = ((BPy_ChainingIterator *)py_c_it)->c_it;
    return py_c_it;
  }
  
  PyObject *BPy_ChainPredicateIterator_from_ChainPredicateIterator(ChainPredicateIterator &cp_it)
  {
    PyObject *py_cp_it = ChainPredicateIterator_Type.tp_new(&ChainPredicateIterator_Type, 0, 0);
    ((BPy_ChainPredicateIterator *)py_cp_it)->cp_it = new ChainPredicateIterator(cp_it);
    ((BPy_ChainPredicateIterator *)py_cp_it)->py_c_it.py_ve_it.py_it.it =
        ((BPy_ChainPredicateIterator *)py_cp_it)->cp_it;
    return py_cp_it;
  }
  
  PyObject *BPy_ChainSilhouetteIterator_from_ChainSilhouetteIterator(ChainSilhouetteIterator &cs_it)
  {
    PyObject *py_cs_it = ChainSilhouetteIterator_Type.tp_new(&ChainSilhouetteIterator_Type, 0, 0);
    ((BPy_ChainSilhouetteIterator *)py_cs_it)->cs_it = new ChainSilhouetteIterator(cs_it);
    ((BPy_ChainSilhouetteIterator *)py_cs_it)->py_c_it.py_ve_it.py_it.it =
        ((BPy_ChainSilhouetteIterator *)py_cs_it)->cs_it;
    return py_cs_it;
  }
  
  //==============================
  // Python => C++
  //==============================
  
  bool bool_from_PyBool(PyObject *b)
  {
    return PyObject_IsTrue(b) != 0;
  }
  
  IntegrationType IntegrationType_from_BPy_IntegrationType(PyObject *obj)
  {
    return static_cast<IntegrationType>(PyLong_AsLong(obj));
  }
  
  Stroke::MediumType MediumType_from_BPy_MediumType(PyObject *obj)
  {
    return static_cast<Stroke::MediumType>(PyLong_AsLong(obj));
  }
  
  Nature::EdgeNature EdgeNature_from_BPy_Nature(PyObject *obj)
  {
    return static_cast<Nature::EdgeNature>(PyLong_AsLong(obj));
  }
  
  bool Vec2f_ptr_from_PyObject(PyObject *obj, Vec2f &vec)
  {
    if (Vec2f_ptr_from_Vector(obj, vec))
      return true;
    if (Vec2f_ptr_from_PyList(obj, vec))
      return true;
    if (Vec2f_ptr_from_PyTuple(obj, vec))
      return true;
    return false;
  }
  
  bool Vec3f_ptr_from_PyObject(PyObject *obj, Vec3f &vec)
  {
    if (Vec3f_ptr_from_Vector(obj, vec))
      return true;
    if (Vec3f_ptr_from_Color(obj, vec))
      return true;
    if (Vec3f_ptr_from_PyList(obj, vec))
      return true;
    if (Vec3f_ptr_from_PyTuple(obj, vec))
      return true;
    return false;
  }
  
  bool Vec3r_ptr_from_PyObject(PyObject *obj, Vec3r &vec)
  {
    if (Vec3r_ptr_from_Vector(obj, vec))
      return true;
    if (Vec3r_ptr_from_Color(obj, vec))
      return true;
    if (Vec3r_ptr_from_PyList(obj, vec))
      return true;
    if (Vec3r_ptr_from_PyTuple(obj, vec))
      return true;
    return false;
  }
  
  bool Vec2f_ptr_from_Vector(PyObject *obj, Vec2f &vec)
  {
    if (!VectorObject_Check(obj) || ((VectorObject *)obj)->size != 2)
      return false;
    if (BaseMath_ReadCallback((BaseMathObject *)obj) == -1)
      return false;
    vec[0] = ((VectorObject *)obj)->vec[0];
    vec[1] = ((VectorObject *)obj)->vec[1];
    return true;
  }
  
  bool Vec3f_ptr_from_Vector(PyObject *obj, Vec3f &vec)
  {
    if (!VectorObject_Check(obj) || ((VectorObject *)obj)->size != 3)
      return false;
    if (BaseMath_ReadCallback((BaseMathObject *)obj) == -1)
      return false;
    vec[0] = ((VectorObject *)obj)->vec[0];
    vec[1] = ((VectorObject *)obj)->vec[1];
    vec[2] = ((VectorObject *)obj)->vec[2];
    return true;
  }
  
  bool Vec3r_ptr_from_Vector(PyObject *obj, Vec3r &vec)
  {
    if (!VectorObject_Check(obj) || ((VectorObject *)obj)->size != 3)
      return false;
    if (BaseMath_ReadCallback((BaseMathObject *)obj) == -1)
      return false;
    vec[0] = ((VectorObject *)obj)->vec[0];
    vec[1] = ((VectorObject *)obj)->vec[1];
    vec[2] = ((VectorObject *)obj)->vec[2];
    return true;
  }
  
  bool Vec3f_ptr_from_Color(PyObject *obj, Vec3f &vec)
  {
    if (!ColorObject_Check(obj))
      return false;
    if (BaseMath_ReadCallback((BaseMathObject *)obj) == -1)
      return false;
    vec[0] = ((ColorObject *)obj)->col[0];
    vec[1] = ((ColorObject *)obj)->col[1];
    vec[2] = ((ColorObject *)obj)->col[2];
    return true;
  }
  
  bool Vec3r_ptr_from_Color(PyObject *obj, Vec3r &vec)
  {
    if (!ColorObject_Check(obj))
      return false;
    if (BaseMath_ReadCallback((BaseMathObject *)obj) == -1)
      return false;
    vec[0] = ((ColorObject *)obj)->col[0];
    vec[1] = ((ColorObject *)obj)->col[1];
    vec[2] = ((ColorObject *)obj)->col[2];
    return true;
  }
  
  static bool float_array_from_PyList(PyObject *obj, float *v, int n)
  {
    for (int i = 0; i < n; i++) {
      v[i] = PyFloat_AsDouble(PyList_GET_ITEM(obj, i));
      if (v[i] == -1.0f && PyErr_Occurred()) {
        PyErr_SetString(PyExc_TypeError, "list elements must be a number");
        return 0;
      }
    }
    return 1;
  }
  
  bool Vec2f_ptr_from_PyList(PyObject *obj, Vec2f &vec)
  {
    float v[2];
  
    if (!PyList_Check(obj) || PyList_GET_SIZE(obj) != 2)
      return false;
    if (!float_array_from_PyList(obj, v, 2))
      return false;
    vec[0] = v[0];
    vec[1] = v[1];
    return true;
  }
  
  bool Vec3f_ptr_from_PyList(PyObject *obj, Vec3f &vec)
  {
    float v[3];
  
    if (!PyList_Check(obj) || PyList_GET_SIZE(obj) != 3)
      return false;
    if (!float_array_from_PyList(obj, v, 3))
      return false;
    vec[0] = v[0];
    vec[1] = v[1];
    vec[2] = v[2];
    return true;
  }
  
  bool Vec3r_ptr_from_PyList(PyObject *obj, Vec3r &vec)
  {
    float v[3];
  
    if (!PyList_Check(obj) || PyList_GET_SIZE(obj) != 3)
      return false;
    if (!float_array_from_PyList(obj, v, 3))
      return false;
    vec[0] = v[0];
    vec[1] = v[1];
    vec[2] = v[2];
    return true;
  }
  
  static bool float_array_from_PyTuple(PyObject *obj, float *v, int n)
  {
    for (int i = 0; i < n; i++) {
      v[i] = PyFloat_AsDouble(PyTuple_GET_ITEM(obj, i));
      if (v[i] == -1.0f && PyErr_Occurred()) {
        PyErr_SetString(PyExc_TypeError, "tuple elements must be a number");
        return 0;
      }
    }
    return 1;
  }
  
  bool Vec2f_ptr_from_PyTuple(PyObject *obj, Vec2f &vec)
  {
    float v[2];
  
    if (!PyTuple_Check(obj) || PyTuple_GET_SIZE(obj) != 2)
      return false;
    if (!float_array_from_PyTuple(obj, v, 2))
      return false;
    vec[0] = v[0];
    vec[1] = v[1];
    return true;
  }
  
  bool Vec3f_ptr_from_PyTuple(PyObject *obj, Vec3f &vec)
  {
    float v[3];
  
    if (!PyTuple_Check(obj) || PyTuple_GET_SIZE(obj) != 3)
      return false;
    if (!float_array_from_PyTuple(obj, v, 3))
      return false;
    vec[0] = v[0];
    vec[1] = v[1];
    vec[2] = v[2];
    return true;
  }
  
  bool Vec3r_ptr_from_PyTuple(PyObject *obj, Vec3r &vec)
  {
    float v[3];
  
    if (!PyTuple_Check(obj) || PyTuple_GET_SIZE(obj) != 3)
      return false;
    if (!float_array_from_PyTuple(obj, v, 3))
      return false;
    vec[0] = v[0];
    vec[1] = v[1];
    vec[2] = v[2];
    return true;
  }
  
  // helpers for argument parsing
  
  bool float_array_from_PyObject(PyObject *obj, float *v, int n)
  {
    if (VectorObject_Check(obj) && ((VectorObject *)obj)->size == n) {
      if (BaseMath_ReadCallback((BaseMathObject *)obj) == -1)
        return 0;
      for (int i = 0; i < n; i++)
        v[i] = ((VectorObject *)obj)->vec[i];
      return 1;
    }
    else if (ColorObject_Check(obj) && n == 3) {
      if (BaseMath_ReadCallback((BaseMathObject *)obj) == -1)
        return 0;
      for (int i = 0; i < n; i++)
        v[i] = ((ColorObject *)obj)->col[i];
      return 1;
    }
    else if (PyList_Check(obj) && PyList_GET_SIZE(obj) == n) {
      return float_array_from_PyList(obj, v, n);
    }
    else if (PyTuple_Check(obj) && PyTuple_GET_SIZE(obj) == n) {
      return float_array_from_PyTuple(obj, v, n);
    }
    return 0;
  }
  
  int convert_v4(PyObject *obj, void *v)
  {
    return mathutils_array_parse((float *)v, 4, 4, obj, "Error parsing 4D vector");
  }
  
  int convert_v3(PyObject *obj, void *v)
  {
    return mathutils_array_parse((float *)v, 3, 3, obj, "Error parsing 3D vector");
  }
  
  int convert_v2(PyObject *obj, void *v)
  {
    return mathutils_array_parse((float *)v, 2, 2, obj, "Error parsing 2D vector");
  }
  
  ///////////////////////////////////////////////////////////////////////////////////////////
  
  #ifdef __cplusplus
  }
  #endif
  