include/opencascade/MeshVS_TwoColors.hxx

0001 // Created on: 2003-10-08
0002 // Created by: Alexander SOLOVYOV
0003 // Copyright (c) 2003-2014 OPEN CASCADE SAS
0004 //
0005 // This file is part of Open CASCADE Technology software library.
0006 //
0007 // This library is free software; you can redistribute it and/or modify it under
0008 // the terms of the GNU Lesser General Public License version 2.1 as published
0009 // by the Free Software Foundation, with special exception defined in the file
0010 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0011 // distribution for complete text of the license and disclaimer of any warranty.
0012 //
0013 // Alternatively, this file may be used under the terms of Open CASCADE
0014 // commercial license or contractual agreement.
0015
0016 #ifndef MeshVS_TwoColors_HeaderFile
0017 #define MeshVS_TwoColors_HeaderFile
0018
0019 #include <Quantity_Color.hxx>
0020
0021 struct MeshVS_TwoColors
0022 {
0023   unsigned int r1 : 8;
0024   unsigned int g1 : 8;
0025   unsigned int b1 : 8;
0026   unsigned int r2 : 8;
0027   unsigned int g2 : 8;
0028   unsigned int b2 : 8;
0029
0030   bool operator==(const MeshVS_TwoColors& TwoColors) const
0031   {
0032     return (((r1 * 256 + g1) * 256 + b1) ==
0033             ((TwoColors.r1 * 256 + TwoColors.g1) * 256 + TwoColors.b1) &&
0034             ((r2 * 256 + g2) * 256 + b2) ==
0035             ((TwoColors.r2 * 256 + TwoColors.g2) * 256 + TwoColors.b2));
0036   }
0037 };
0038
0039 namespace std
0040 {
0041   template<>
0042   struct hash<MeshVS_TwoColors>
0043   {
0044     size_t operator()(const MeshVS_TwoColors& TwoColors) const noexcept
0045     {
0046       unsigned int aHash = 0;
0047       meshprsHashByte(aHash, TwoColors.r1);
0048       meshprsHashByte(aHash, TwoColors.g1);
0049       meshprsHashByte(aHash, TwoColors.b1);
0050       meshprsHashByte(aHash, TwoColors.r2);
0051       meshprsHashByte(aHash, TwoColors.g2);
0052       meshprsHashByte(aHash, TwoColors.b2);
0053       return std::hash<unsigned int>{}(aHash);
0054     }
0055   private:
0056     void meshprsHashByte(unsigned int& theHash, const unsigned int theValues) const noexcept
0057     {
0058       theHash += (theValues);
0059       theHash += (theHash << 10);
0060       theHash ^= (theHash >> 6);
0061     }
0062
0063   };
0064 }
0065
0066 Standard_EXPORT MeshVS_TwoColors  BindTwoColors ( const Quantity_Color&, const Quantity_Color& );
0067 Standard_EXPORT Quantity_Color    ExtractColor  ( MeshVS_TwoColors&, const Standard_Integer );
0068 Standard_EXPORT void              ExtractColors ( MeshVS_TwoColors&, Quantity_Color&, Quantity_Color& );
0069
0070 #endif