iLab Neuromorphic Robotics Toolkit  0.1
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PixelPainterImpl.H
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1 /*! @file
2  @author Randolph Voorhies
3  @copyright GNU Public License (GPL v3)
4  @section License
5  @verbatim
6  // ////////////////////////////////////////////////////////////////////////
7  // The iLab Neuromorphic Robotics Toolkit (NRT) //
8  // Copyright 2010-2012 by the University of Southern California (USC) //
9  // and the iLab at USC. //
10  // //
11  // iLab - University of Southern California //
12  // Hedco Neurociences Building, Room HNB-10 //
13  // Los Angeles, Ca 90089-2520 - USA //
14  // //
15  // See http://ilab.usc.edu for information about this project. //
16  // ////////////////////////////////////////////////////////////////////////
17  // This file is part of The iLab Neuromorphic Robotics Toolkit. //
18  // //
19  // The iLab Neuromorphic Robotics Toolkit is free software: you can //
20  // redistribute it and/or modify it under the terms of the GNU General //
21  // Public License as published by the Free Software Foundation, either //
22  // version 3 of the License, or (at your option) any later version. //
23  // //
24  // The iLab Neuromorphic Robotics Toolkit is distributed in the hope //
25  // that it will be useful, but WITHOUT ANY WARRANTY; without even the //
26  // implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
27  // PURPOSE. See the GNU General Public License for more details. //
28  // //
29  // You should have received a copy of the GNU General Public License //
30  // along with The iLab Neuromorphic Robotics Toolkit. If not, see //
31  // <http://www.gnu.org/licenses/>. //
32  // ////////////////////////////////////////////////////////////////////////
33  @endverbatim */
34 
35 
36 template<
37  class T,
38  template<typename> class PixDest,
39  class U,
40  template<typename> class PixSource
41  >
42  class PixelPainter<T, PixDest, U, PixSource,
43  typename std::enable_if<std::is_base_of<PixelWithAlpha<U>, PixSource<U>>::value, void>::type
44  >
45  {
46  public:
47  PixelPainter(PixSource<U> const& color) :
48  sourceColor(color),
49  convColor(color)
50  { }
51 
52  inline void paint(PixDest<T>* dest)
53  {
54  float normAlpha = sourceColor.alpha/255.0F;
55  float alpha = normAlpha;
56  float beta = (1.0-normAlpha);
57 
58  size_t idx=0;
59  for(auto &c : dest->channels)
60  c = T(beta*c + alpha*convColor.channels[idx++]);
61  }
62 
63  PixSource<U> sourceColor;
64  PixDest<T> convColor;
65  };
66 
67 template<
68  class T,
69  template<typename> class PixDest,
70  class U,
71  template<typename> class PixSource
72  >
73  class PixelPainter<T, PixDest, U, PixSource,
74  typename std::enable_if<!std::is_base_of<PixelWithAlpha<U>, PixSource<U>>::value, void>::type
75  >
76  {
77  public:
78  PixelPainter(PixSource<U> const& color) :
79  convColor(color)
80  { }
81 
82  inline void paint(PixDest<T>* dest)
83  { *dest = convColor; }
84 
85  PixDest<T> convColor;
86  };
87