png++  0.2.1
streaming_base.hpp
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1 /*
2  * Copyright (C) 2007,2008 Alex Shulgin
3  *
4  * This file is part of png++ the C++ wrapper for libpng. PNG++ is free
5  * software; the exact copying conditions are as follows:
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions are met:
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10  * 1. Redistributions of source code must retain the above copyright notice,
11  * this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
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17  * 3. The name of the author may not be used to endorse or promote products
18  * derived from this software without specific prior written permission.
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20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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30  */
31 #ifndef PNGPP_STREAMING_BASE_HPP_INCLUDED
32 #define PNGPP_STREAMING_BASE_HPP_INCLUDED
33 
34 #include <cassert>
35 #include "image_info.hpp"
36 #include "pixel_traits.hpp"
37 
38 namespace png
39 {
40 
46  {
47  public:
49  : m_info(info)
50  {
51  }
52 
54  {
55  return m_info;
56  }
57 
58  private:
59  image_info m_info;
60  };
61 
68  {
69  public:
71  : m_info(info)
72  {
73  }
74 
76  {
77  return m_info;
78  }
79 
80  private:
81  image_info& m_info;
82  };
83 
89  template< typename pixel, class info_holder >
91  {
92  public:
93  typedef pixel_traits< pixel > traits;
94 
96  : m_info_holder(info)
97  {
98  }
99 
100  streaming_base(size_t width, size_t height)
101  : m_info_holder(make_image_info< pixel >())
102  {
103  get_info().set_width(width);
104  get_info().set_height(height);
105  }
106 
107  image_info const& get_info() const
108  {
109  return m_info_holder.get_info();
110  }
111 
112  protected:
113  void reset(size_t /*pass*/)
114  {
115  // nothing to do in the most general case
116  }
117 
119  {
120  return m_info_holder.get_info();
121  }
122 
123  info_holder m_info_holder;
124  };
125 
126 } // namespace png
127 
128 #endif // PNGPP_STREAMING_BASE_HPP_INCLUDED