support now face coords for OM reader/writer

src/OpenMesh/Core/IO/importer/BaseImporter.hh

@@ -152,6 +152,9 @@ public:
   // set incident face handle for given halfedge
   virtual void set_face(HalfedgeHandle _heh, FaceHandle _fh) = 0;
 
+  // request texture coordinate property
+  virtual void request_face_texcoords2D() = 0;
+
   // set vertex texture coordinate
   virtual void set_texcoord(HalfedgeHandle _heh, const Vec2f& _texcoord) = 0;
 

src/OpenMesh/Core/IO/importer/ImporterT.hh

@@ -285,6 +285,11 @@ public:
     mesh_.set_face_handle(_heh, _fh);
   }
 
+  virtual void request_face_texcoords2D() override
+  {
+    if(!mesh_.has_halfedge_texcoords2D())
+      mesh_.request_halfedge_texcoords2D();
+  }
 
   virtual void set_texcoord(HalfedgeHandle _heh, const Vec2f& _texcoord) override
   { 

src/OpenMesh/Core/IO/reader/OMReader.cc

@@ -182,7 +182,6 @@ bool _OMReader_::read_binary(std::istream& _is, BaseImporter& _bi, Options& _opt
     return false;
   }
 
-
   while (!_is.eof()) {
     bytes_ += restore(_is, chunk_header_, swap);
 
@@ -661,6 +660,28 @@ bool _OMReader_::read_binary_halfedge_chunk(std::istream &_is, BaseImporter &_bi
       bytes_ += restore_binary_custom_data(_is, _bi.kernel()->_get_hprop(property_name_), 2 * header_.n_edges_, _swap);
       break;
     }
+
+    //----------------------------------------------------------------------------------------
+  case Chunk::Type_Texcoord:
+  {
+    assert( OMFormat::dimensions(chunk_header_) == size_t(OpenMesh::Vec2f::dim()));
+
+    //fileOptions_ += OpenMesh::IO::Options::FaceTexCoord;
+
+    if (_opt.face_has_texcoord())
+    {
+      _bi.request_face_texcoords2D();
+    }
+    OpenMesh::Vec2f v2f;
+    for (size_t e_idx = 0; e_idx < header_.n_edges_*2; ++e_idx)
+    {
+      bytes_ += vector_restore(_is, v2f, _swap);
+      if (_opt.face_has_texcoord())
+        _bi.set_texcoord(HalfedgeHandle(int(e_idx)), v2f);
+    }
+    break;
+    }
+    //----------------------------------------------------------------------------------------
     case Chunk::Type_Topology:
     {
       std::vector<HalfedgeHandle> next_halfedges;

src/OpenMesh/Core/IO/writer/OMWriter.cc

@@ -303,7 +303,6 @@ bool _OMWriter_::write_binary(std::ostream& _os, BaseExporter& _be,
     chunk_header.dim_ = OMFormat::dim(t);
     chunk_header.bits_ = OMFormat::bits(t[0]);
 
-    // std::clog << chunk_header << std::endl;
     bytes += store(_os, chunk_header, swap);
 
     for (i = 0, nV = header.n_vertices_; i < nV; ++i)
@@ -337,6 +336,30 @@ bool _OMWriter_::write_binary(std::ostream& _os, BaseExporter& _be,
     }
   }
 
+
+  // ---------- write face texture coords
+  if (_OMWriter_::version_ > OMFormat::mk_version(2,1) && _be.n_edges() && _opt.check(Options::FaceTexCoord))
+  {
+
+    t = _be.texcoord(HalfedgeHandle(0));
+
+    chunk_header.name_ = false;
+    chunk_header.entity_ = OMFormat::Chunk::Entity_Halfedge;
+    chunk_header.type_ = OMFormat::Chunk::Type_Texcoord;
+    chunk_header.signed_ = OMFormat::is_signed(t[0]);
+    chunk_header.float_ = OMFormat::is_float(t[0]);
+    chunk_header.dim_ = OMFormat::dim(t);
+    chunk_header.bits_ = OMFormat::bits(t[0]);
+
+    bytes += store(_os, chunk_header, swap);
+
+    int nHE;
+    for (i = 0, nHE = header.n_edges_*2; i < nHE; ++i)
+      bytes += vector_store(_os, _be.texcoord(HalfedgeHandle(i)), swap);
+
+  }
+  //---------------------------------------------------------------
+
   // ---------- write vertex topology (outgoing halfedge)
   if (_be.n_vertices())
   {

src/Unittests/unittests_read_write_OM.cc

@@ -1711,8 +1711,14 @@ TEST_F(OpenMeshReadWriteOM, LoadTriangleMeshWithPropertiesCurrentVersion) {
 
   add_all_properties(mesh_);
 
+  mesh_.request_halfedge_texcoords2D();
+
   std::string file_name_2_2 = "cube_tri_with_properties_2_2.om";
   OpenMesh::IO::Options ops(OpenMesh::IO::Options::Custom);
+  ops += OpenMesh::IO::Options::FaceTexCoord;
+
+  std::cout << "ops has facetexcoords: " << ops.face_has_texcoord() << std::endl;
+
   OpenMesh::IO::write_mesh(mesh_, file_name_2_2, ops);
 
   Mesh new_mesh;
@@ -1720,6 +1726,7 @@ TEST_F(OpenMeshReadWriteOM, LoadTriangleMeshWithPropertiesCurrentVersion) {
   OpenMesh::IO::read_mesh(new_mesh, file_name_2_2, ops);
 
   check_all_properties(new_mesh);
+  EXPECT_TRUE(new_mesh.has_halfedge_texcoords2D());
 }
 
 /*