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<div class="title">channel_algorithm.hpp</div> </div>
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<a href="channel__algorithm_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> Copyright 2005-2007 Adobe Systems Incorporated</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> </span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Use, modification and distribution are subject to the Boost Software License,</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> http://www.boost.org/LICENSE_1_0.txt).</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"></span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> See http://opensource.adobe.com/gil for most recent version including documentation.</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">*/</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/*************************************************************************************************/</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#ifndef GIL_CHANNEL_ALGORITHM_HPP</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor"></span><span class="preprocessor">#define GIL_CHANNEL_ALGORITHM_HPP</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <boost/config.hpp></span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <boost/integer_traits.hpp></span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <boost/mpl/less.hpp></span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <boost/mpl/integral_c.hpp></span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <boost/mpl/greater.hpp></span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <boost/type_traits.hpp></span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include "<a class="code" href="gil__config_8hpp.html">gil_config.hpp</a>"</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include "<a class="code" href="channel_8hpp.html">channel.hpp</a>"</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">//#ifdef _MSC_VER</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">//#pragma warning(push)</span></div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">//#pragma warning(disable: 4309) // disable truncation of constant value warning (using -1 to get the max value of an integral)</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">//#endif</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">namespace </span>detail {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// some forward declarations</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1detail_1_1channel__converter__unsigned__impl.html"> 46</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcIsIntegral, <span class="keywordtype">bool</span> DstIsIntegral> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1detail_1_1channel__converter__unsigned__impl.html">channel_converter_unsigned_impl</a>;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcIsGreater> <span class="keyword">struct </span>channel_converter_unsigned_integral;</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcLessThanDst, <span class="keywordtype">bool</span> SrcDivisible> <span class="keyword">struct </span>channel_converter_unsigned_integral_impl;</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcLessThanDst, <span class="keywordtype">bool</span> CannotFitInInteger> <span class="keyword">struct </span>channel_converter_unsigned_integral_nondivisible;</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Un<span class="keywordtype">signed</span>IntegralChannel></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">struct </span>unsigned_integral_max_value : <span class="keyword">public</span> mpl::integral_c<UnsignedIntegralChannel,integer_traits< UnsignedIntegralChannel>::const_max> {};</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keyword">template</span> <></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">struct </span>unsigned_integral_max_value<uint8_t> : <span class="keyword">public</span> mpl::integral_c<uint32_t,0xFF> {};</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="keyword">template</span> <></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="keyword">struct </span>unsigned_integral_max_value<uint16_t> : <span class="keyword">public</span> mpl::integral_c<uint32_t,0xFFFF> {};</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">template</span> <></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="keyword">struct </span>unsigned_integral_max_value<uint32_t> : <span class="keyword">public</span> mpl::integral_c<uintmax_t,0xFFFFFFFF> {};</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">template</span> <<span class="keywordtype">int</span> K></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">struct </span>unsigned_integral_max_value<packed_channel_value<K> ></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  : <span class="keyword">public</span> mpl::integral_c<typename packed_channel_value<K>::integer_t, (uint64_t(1)<<K)-1> {};</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> template <typename UnsignedIntegralChannel></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> struct unsigned_integral_num_bits : public mpl::int_<sizeof(UnsignedIntegralChannel)*8> {};</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> template <int K></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> struct unsigned_integral_num_bits<packed_channel_value<K> ></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  : public mpl::int_<K> {};</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> } <span class="comment">// namespace detail</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> template <typename SrcChannelV, typename DstChannelV> <span class="comment">// Model ChannelValueConcept</span></div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> struct channel_converter_unsigned</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  : public detail::channel_converter_unsigned_impl<SrcChannelV,DstChannelV,is_integral<SrcChannelV>::value,is_integral<DstChannelV>::value> {};</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
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<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01_t_00_01_t_01_4.html"> 129</a></span> template <typename T> struct channel_converter_unsigned<T,T> : public detail::identity<T> {};</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> namespace detail {</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> template <typename SrcChannelV, typename DstChannelV, bool SrcIsIntegral, bool DstIsIntegral> </div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> struct channel_converter_unsigned_impl : public std::unary_function<DstChannelV,SrcChannelV> {</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  DstChannelV operator()(SrcChannelV src) const { </div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  return DstChannelV(channel_traits<DstChannelV>::min_value() +</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  (src - channel_traits<SrcChannelV>::min_value()) / channel_range<SrcChannelV>() * channel_range<DstChannelV>()); </div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  }</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> private:</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  template <typename C></div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  static double channel_range() {</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  return double(channel_traits<C>::max_value()) - double(channel_traits<C>::min_value());</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> };</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment">// When both the source and the destination are integral channels, perform a faster conversion</span></div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> template <typename SrcChannelV, typename DstChannelV> </div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> struct channel_converter_unsigned_impl<SrcChannelV,DstChannelV,true,true></div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  : public channel_converter_unsigned_integral<SrcChannelV,DstChannelV,</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  mpl::less<unsigned_integral_max_value<SrcChannelV>,unsigned_integral_max_value<DstChannelV> >::value > {};</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> </div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> template <typename SrcChannelV, typename DstChannelV> </div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> struct channel_converter_unsigned_integral<SrcChannelV,DstChannelV,true></div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  : public channel_converter_unsigned_integral_impl<SrcChannelV,DstChannelV,true,</div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  !(unsigned_integral_max_value<DstChannelV>::value % unsigned_integral_max_value<SrcChannelV>::value) > {};</div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> template <typename SrcChannelV, typename DstChannelV> </div>
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> struct channel_converter_unsigned_integral<SrcChannelV,DstChannelV,false></div>
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  : public channel_converter_unsigned_integral_impl<SrcChannelV,DstChannelV,false,</div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  !(unsigned_integral_max_value<SrcChannelV>::value % unsigned_integral_max_value<DstChannelV>::value) > {};</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment">// Both source and destination are unsigned integral channels, </span></div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment">// the src max value is less than the dst max value,</span></div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment">// and the dst max value is divisible by the src max value</span></div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> template <typename SrcChannelV, typename DstChannelV> </div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> struct channel_converter_unsigned_integral_impl<SrcChannelV,DstChannelV,true,true> {</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  DstChannelV operator()(SrcChannelV src) const { </div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  typedef typename unsigned_integral_max_value<DstChannelV>::value_type integer_t;</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  static const integer_t mul = unsigned_integral_max_value<DstChannelV>::value / unsigned_integral_max_value<SrcChannelV>::value;</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  return DstChannelV(src * mul);</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> };</div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> </div>
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment">// Both source and destination are unsigned integral channels, </span></div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment">// the dst max value is less than (or equal to) the src max value,</span></div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment">// and the src max value is divisible by the dst max value</span></div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> template <typename SrcChannelV, typename DstChannelV> </div>
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<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> struct channel_converter_unsigned_integral_impl<SrcChannelV,DstChannelV,false,true> {</div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  DstChannelV operator()(SrcChannelV src) const { </div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  typedef typename unsigned_integral_max_value<SrcChannelV>::value_type integer_t;</div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  static const integer_t div = unsigned_integral_max_value<SrcChannelV>::value / unsigned_integral_max_value<DstChannelV>::value;</div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  static const integer_t div2 = div/2;</div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  return DstChannelV((src + div2) / div);</div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  }</div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> };</div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> </div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment">// Prevent overflow for the largest integral type</span></div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> template <typename DstChannelV> </div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> struct channel_converter_unsigned_integral_impl<uintmax_t,DstChannelV,false,true> {</div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  DstChannelV operator()(uintmax_t src) const { </div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  static const uintmax_t div = unsigned_integral_max_value<bits32>::value / unsigned_integral_max_value<DstChannelV>::value;</div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  static const uintmax_t div2 = div/2;</div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  if (src > unsigned_integral_max_value<uintmax_t>::value - div2)</div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  return unsigned_integral_max_value<DstChannelV>::value;</div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  return DstChannelV((src + div2) / div);</div>
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  }</div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> };</div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment">// Both source and destination are unsigned integral channels, </span></div>
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<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment">// and the dst max value is not divisible by the src max value</span></div>
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<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment">// See if you can represent the expression (src * dst_max) / src_max in integral form</span></div>
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<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> template <typename SrcChannelV, typename DstChannelV, bool SrcLessThanDst> </div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> struct channel_converter_unsigned_integral_impl<SrcChannelV,DstChannelV,SrcLessThanDst,false> </div>
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<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  : public channel_converter_unsigned_integral_nondivisible<SrcChannelV,DstChannelV,SrcLessThanDst,</div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  mpl::greater<</div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  mpl::plus<unsigned_integral_num_bits<SrcChannelV>,unsigned_integral_num_bits<DstChannelV> >,</div>
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  unsigned_integral_num_bits<uintmax_t></div>
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<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  >::value> {};</div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> </div>
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<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment">// Both source and destination are unsigned integral channels, </span></div>
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|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment">// the src max value is less than the dst max value,</span></div>
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<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment">// and the dst max value is not divisible by the src max value</span></div>
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<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment">// The expression (src * dst_max) / src_max fits in an integer</span></div>
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<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> template <typename SrcChannelV, typename DstChannelV> </div>
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<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> struct channel_converter_unsigned_integral_nondivisible<SrcChannelV,DstChannelV,true,false> {</div>
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<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  DstChannelV operator()(SrcChannelV src) const {</div>
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<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  typedef typename base_channel_type<DstChannelV>::type dest_t;</div>
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<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  return DstChannelV(static_cast<dest_t>( src * unsigned_integral_max_value<DstChannelV>::value) / unsigned_integral_max_value<SrcChannelV>::value);</div>
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<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  }</div>
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<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> };</div>
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<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div>
|
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment">// Both source and destination are unsigned integral channels, </span></div>
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|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment">// the src max value is less than the dst max value,</span></div>
|
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<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment">// and the dst max value is not divisible by the src max value</span></div>
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<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment">// The expression (src * dst_max) / src_max cannot fit in an integer (overflows). Use a double</span></div>
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<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> template <typename SrcChannelV, typename DstChannelV> </div>
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<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> struct channel_converter_unsigned_integral_nondivisible<SrcChannelV,DstChannelV,true,true> {</div>
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<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  DstChannelV operator()(SrcChannelV src) const {</div>
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<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  static const double mul = unsigned_integral_max_value<DstChannelV>::value / double(unsigned_integral_max_value<SrcChannelV>::value);</div>
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<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  return DstChannelV(src * mul);</div>
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<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  }</div>
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<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> };</div>
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<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> </div>
|
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<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="comment">// Both source and destination are unsigned integral channels, </span></div>
|
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<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment">// the dst max value is less than (or equal to) the src max value,</span></div>
|
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<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment">// and the src max value is not divisible by the dst max value</span></div>
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<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> template <typename SrcChannelV, typename DstChannelV, bool CannotFit> </div>
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<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> struct channel_converter_unsigned_integral_nondivisible<SrcChannelV,DstChannelV,false,CannotFit> {</div>
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<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  DstChannelV operator()(SrcChannelV src) const { </div>
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<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div>
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<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  typedef typename detail::unsigned_integral_max_value< SrcChannelV >::value_type src_integer_t;</div>
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<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  typedef typename detail::unsigned_integral_max_value< DstChannelV >::value_type dst_integer_t;</div>
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<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div>
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<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  static const double div = unsigned_integral_max_value<SrcChannelV>::value </div>
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<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  / static_cast< double >( unsigned_integral_max_value<DstChannelV>::value );</div>
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<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> </div>
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<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  static const src_integer_t div2 = static_cast< src_integer_t >( div / 2.0 );</div>
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<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  return DstChannelV( static_cast< dst_integer_t >(( static_cast< double >( src + div2 ) / div )));</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  }</div>
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<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> };</div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div>
|
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> } <span class="comment">// namespace detail</span></div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> </div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> </div>
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<div class="line"><a name="l00276"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01bits32f_00_01_dst_channel_v_01_4.html"> 276</a></span> template <typename DstChannelV> struct channel_converter_unsigned<bits32f,DstChannelV> : public std::unary_function<bits32f,DstChannelV> {</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  DstChannelV operator()(bits32f x) const</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  {</div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  typedef typename detail::unsigned_integral_max_value< DstChannelV >::value_type dst_integer_t;</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  return DstChannelV( static_cast< dst_integer_t >(x*channel_traits<DstChannelV>::max_value()+0.5f ));</div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  }</div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> };</div>
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> template <typename SrcChannelV> struct channel_converter_unsigned<SrcChannelV,bits32f> : public std::unary_function<SrcChannelV,bits32f> {</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  bits32f operator()(SrcChannelV x) const { return bits32f(x/float(channel_traits<SrcChannelV>::max_value())); }</div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> };</div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> </div>
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<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> template <> struct channel_converter_unsigned<bits32f,bits32f> : public std::unary_function<bits32f,bits32f> {</div>
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<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  bits32f operator()(bits32f x) const { return x; }</div>
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<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> };</div>
|
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<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> </div>
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> </div>
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<div class="line"><a name="l00294"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01bits32_00_01bits32f_01_4.html"> 294</a></span> template <> struct channel_converter_unsigned<bits32,bits32f> : public std::unary_function<bits32,bits32f> {</div>
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<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  bits32f operator()(bits32 x) const { </div>
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<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="comment">// unfortunately without an explicit check it is possible to get a round-off error. We must ensure that max_value of bits32 matches max_value of bits32f</span></div>
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<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  if (x>=channel_traits<bits32>::max_value()) return <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits</a><bits32f>::max_value();</div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  return float(x) / float(channel_traits<bits32>::max_value());</div>
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<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  }</div>
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<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> };</div>
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<div class="line"><a name="l00302"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01bits32f_00_01bits32_01_4.html"> 302</a></span> template <> struct channel_converter_unsigned<bits32f,bits32> : <span class="keyword">public</span> std::unary_function<bits32f,bits32> {</div>
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<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  bits32 operator()(<a class="code" href="structboost_1_1gil_1_1scoped__channel__value.html">bits32f</a> x)<span class="keyword"> const </span>{ </div>
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<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="comment">// unfortunately without an explicit check it is possible to get a round-off error. We must ensure that max_value of bits32 matches max_value of bits32f</span></div>
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<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <span class="keywordflow">if</span> (x>=<a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<bits32f>::max_value</a>()) <span class="keywordflow">return</span> <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<bits32>::max_value</a>();</div>
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<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordflow">return</span> bits32(x * <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<bits32>::max_value</a>() + 0.5f); </div>
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  }</div>
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<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> };</div>
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<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> </div>
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<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> </div>
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<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="keyword">namespace </span>detail {</div>
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="comment">// Converting from signed to unsigned integral channel. </span></div>
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> <span class="comment">// It is both a unary function, and a metafunction (thus requires the 'type' nested typedef, which equals result_type)</span></div>
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<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> <span class="keyword">template</span> <<span class="keyword">typename</span> ChannelValue> <span class="comment">// Model ChannelValueConcept</span></div>
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<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="keyword">struct </span>channel_convert_to_unsigned : <span class="keyword">public</span> <a class="code" href="structboost_1_1gil_1_1detail_1_1identity.html">detail::identity</a><ChannelValue> {</div>
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<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keyword">typedef</span> ChannelValue type;</div>
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<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> };</div>
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<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div>
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<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="keyword">template</span> <> <span class="keyword">struct </span>channel_convert_to_unsigned<bits8s> : <span class="keyword">public</span> std::unary_function<bits8s,bits8> { </div>
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<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="keyword">typedef</span> bits8 type;</div>
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<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  type operator()(bits8s val)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> val+128; } </div>
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<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> };</div>
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<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> </div>
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<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="keyword">template</span> <> <span class="keyword">struct </span>channel_convert_to_unsigned<bits16s> : <span class="keyword">public</span> std::unary_function<bits16s,bits16> { </div>
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<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keyword">typedef</span> bits16 type;</div>
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<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  type operator()(bits16s val)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> val+32768; } </div>
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<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> };</div>
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<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> </div>
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<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="keyword">template</span> <> <span class="keyword">struct </span>channel_convert_to_unsigned<bits32s> : <span class="keyword">public</span> std::unary_function<bits32s,bits32> {</div>
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<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keyword">typedef</span> bits32 type;</div>
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<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  type operator()(bits32s x)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>bits32<span class="keyword">></span>(x+(1<<31)); }</div>
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<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> };</div>
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<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> </div>
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<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div>
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<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="comment">// Converting from unsigned to signed integral channel</span></div>
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<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="comment">// It is both a unary function, and a metafunction (thus requires the 'type' nested typedef, which equals result_type)</span></div>
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<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="keyword">template</span> <<span class="keyword">typename</span> ChannelValue> <span class="comment">// Model ChannelValueConcept</span></div>
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<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="keyword">struct </span>channel_convert_from_unsigned : <span class="keyword">public</span> detail::identity<ChannelValue> {</div>
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<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="keyword">typedef</span> ChannelValue type;</div>
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<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> };</div>
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<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> </div>
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<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="keyword">template</span> <> <span class="keyword">struct </span>channel_convert_from_unsigned<bits8s> : <span class="keyword">public</span> std::unary_function<bits8,bits8s> { </div>
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<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keyword">typedef</span> bits8s type;</div>
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<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  type operator()(bits8 val)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> val-128; } </div>
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<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> };</div>
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<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> </div>
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<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="keyword">template</span> <> <span class="keyword">struct </span>channel_convert_from_unsigned<bits16s> : <span class="keyword">public</span> std::unary_function<bits16,bits16s> { </div>
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<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  <span class="keyword">typedef</span> bits16s type;</div>
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<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  type operator()(bits16 val)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> val-32768; } </div>
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<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> };</div>
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<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div>
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<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> <span class="keyword">template</span> <> <span class="keyword">struct </span>channel_convert_from_unsigned<bits32s> : <span class="keyword">public</span> std::unary_function<bits32,bits32s> {</div>
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<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  <span class="keyword">typedef</span> bits32s type;</div>
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<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  type operator()(bits32 x)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>bits32s<span class="keyword">></span>(x-(1<<31)); }</div>
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<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> };</div>
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<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> </div>
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<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> } <span class="comment">// namespace detail</span></div>
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<div class="line"><a name="l00359"></a><span class="lineno"> 359</span> </div>
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<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV> <span class="comment">// Model ChannelValueConcept</span></div>
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<div class="line"><a name="l00363"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter.html"> 363</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__converter.html">channel_converter</a> : <span class="keyword">public</span> std::unary_function<SrcChannelV,DstChannelV> {</div>
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<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  DstChannelV operator()(<span class="keyword">const</span> SrcChannelV& src)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  <span class="keyword">typedef</span> detail::channel_convert_to_unsigned<SrcChannelV> to_unsigned;</div>
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<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keyword">typedef</span> detail::channel_convert_from_unsigned<DstChannelV> from_unsigned;</div>
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<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="keyword">typedef</span> channel_converter_unsigned<typename to_unsigned::result_type, typename from_unsigned::argument_type> converter_unsigned;</div>
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<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordflow">return</span> from_unsigned()(converter_unsigned()(to_unsigned()(src))); </div>
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<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  }</div>
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<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> };</div>
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<div class="line"><a name="l00371"></a><span class="lineno"> 371</span> </div>
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<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> <span class="keyword">template</span> <<span class="keyword">typename</span> DstChannel, <span class="keyword">typename</span> SrcChannel> <span class="comment">// Model ChannelConcept (could be channel references)</span></div>
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<div class="line"><a name="l00375"></a><span class="lineno"><a class="line" href="group___channel_convert_algorithm.html#ga1ca10b1d27bc2f2ce4906b8890e613a5"> 375</a></span> <span class="keyword">inline</span> <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<DstChannel>::value_type</a> <a class="code" href="group___channel_convert_algorithm.html#ga1ca10b1d27bc2f2ce4906b8890e613a5">channel_convert</a>(<span class="keyword">const</span> SrcChannel& src) { </div>
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<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="keywordflow">return</span> <a class="code" href="structboost_1_1gil_1_1channel__converter.html">channel_converter<typename channel_traits<SrcChannel>::value_type</a>,</div>
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<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<DstChannel>::value_type</a>>()(src); </div>
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<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> }</div>
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<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> </div>
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<div class="line"><a name="l00384"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__channel__converter.html"> 384</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__channel__converter.html">default_channel_converter</a> {</div>
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<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> Ch1, <span class="keyword">typename</span> Ch2></div>
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<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> Ch1& src, Ch2& dst)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  dst=channel_convert<Ch2>(src);</div>
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<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  }</div>
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<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> };</div>
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<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> </div>
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<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> <span class="keyword">namespace </span>detail {</div>
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<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="comment">// fast integer division by 255</span></div>
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<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="keyword">inline</span> uint32_t div255(uint32_t in) { uint32_t tmp=in+128; <span class="keywordflow">return</span> (tmp + (tmp>>8))>>8; }</div>
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<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> </div>
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<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="comment">// fast integer divison by 32768</span></div>
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<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="keyword">inline</span> uint32_t div32768(uint32_t in) { <span class="keywordflow">return</span> (in+16384)>>15; }</div>
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<div class="line"><a name="l00397"></a><span class="lineno"> 397</span> }</div>
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<div class="line"><a name="l00398"></a><span class="lineno"> 398</span> </div>
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<div class="line"><a name="l00412"></a><span class="lineno"> 412</span> </div>
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<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> <span class="keyword">template</span> <<span class="keyword">typename</span> ChannelValue></div>
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<div class="line"><a name="l00416"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html"> 416</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a> : <span class="keyword">public</span> std::binary_function<ChannelValue,ChannelValue,ChannelValue> {</div>
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<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  ChannelValue operator()(ChannelValue a, ChannelValue b)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  <span class="keywordflow">return</span> ChannelValue(<span class="keyword">static_cast<</span>typename base_channel_type<ChannelValue>::type<span class="keyword">></span>(a / <span class="keywordtype">double</span>(<a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<ChannelValue>::max_value</a>()) * b));</div>
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<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  }</div>
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<div class="line"><a name="l00420"></a><span class="lineno"> 420</span> };</div>
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<div class="line"><a name="l00421"></a><span class="lineno"> 421</span> </div>
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<div class="line"><a name="l00423"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01bits8_01_4.html"> 423</a></span> <span class="keyword">template</span><> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a><bits8> : <span class="keyword">public</span> std::binary_function<bits8,bits8,bits8> {</div>
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<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  bits8 operator()(bits8 a, bits8 b)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> bits8(detail::div255(uint32_t(a) * uint32_t(b))); }</div>
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<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> };</div>
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<div class="line"><a name="l00426"></a><span class="lineno"> 426</span> </div>
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<div class="line"><a name="l00428"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01bits16_01_4.html"> 428</a></span> <span class="keyword">template</span><> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a><bits16> : <span class="keyword">public</span> std::binary_function<bits16,bits16,bits16> {</div>
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<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  bits16 operator()(bits16 a, bits16 b)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> bits16((uint32_t(a) * uint32_t(b))/65535); }</div>
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<div class="line"><a name="l00430"></a><span class="lineno"> 430</span> };</div>
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<div class="line"><a name="l00431"></a><span class="lineno"> 431</span> </div>
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<div class="line"><a name="l00433"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01bits32f_01_4.html"> 433</a></span> <span class="keyword">template</span><> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a><<a class="code" href="structboost_1_1gil_1_1scoped__channel__value.html">bits32f</a>> : <span class="keyword">public</span> std::binary_function<bits32f,bits32f,bits32f> {</div>
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<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <a class="code" href="structboost_1_1gil_1_1scoped__channel__value.html">bits32f</a> operator()(<a class="code" href="structboost_1_1gil_1_1scoped__channel__value.html">bits32f</a> a, <a class="code" href="structboost_1_1gil_1_1scoped__channel__value.html">bits32f</a> b)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> a*b; }</div>
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<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> };</div>
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<div class="line"><a name="l00436"></a><span class="lineno"> 436</span> </div>
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<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> <span class="keyword">template</span> <<span class="keyword">typename</span> ChannelValue></div>
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<div class="line"><a name="l00439"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier.html"> 439</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier.html">channel_multiplier</a> : <span class="keyword">public</span> std::binary_function<ChannelValue, ChannelValue, ChannelValue> {</div>
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<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  ChannelValue operator()(ChannelValue a, ChannelValue b)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  <span class="keyword">typedef</span> detail::channel_convert_to_unsigned<ChannelValue> to_unsigned;</div>
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<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="keyword">typedef</span> detail::channel_convert_from_unsigned<ChannelValue> from_unsigned;</div>
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<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  <span class="keyword">typedef</span> <a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned<typename to_unsigned::result_type></a> multiplier_unsigned;</div>
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<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  <span class="keywordflow">return</span> from_unsigned()(multiplier_unsigned()(to_unsigned()(a), to_unsigned()(b))); </div>
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<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  }</div>
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<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> };</div>
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<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> </div>
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<div class="line"><a name="l00449"></a><span class="lineno"> 449</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel> <span class="comment">// Models ChannelConcept (could be a channel reference)</span></div>
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<div class="line"><a name="l00450"></a><span class="lineno"><a class="line" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974"> 450</a></span> <span class="keyword">inline</span> <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<Channel>::value_type</a> <a class="code" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">channel_multiply</a>(Channel a, Channel b) { </div>
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<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  <span class="keywordflow">return</span> <a class="code" href="structboost_1_1gil_1_1channel__multiplier.html">channel_multiplier<typename channel_traits<Channel>::value_type</a>>()(a,b);</div>
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<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> }</div>
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<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> </div>
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<div class="line"><a name="l00469"></a><span class="lineno"> 469</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel> <span class="comment">// Models ChannelConcept (could be a channel reference)</span></div>
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<div class="line"><a name="l00472"></a><span class="lineno"><a class="line" href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5"> 472</a></span> <span class="keyword">inline</span> <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<Channel>::value_type</a> <a class="code" href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">channel_invert</a>(Channel x) { </div>
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<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  <span class="keywordflow">return</span> <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<Channel>::max_value</a>()-x + <a class="code" href="structboost_1_1gil_1_1channel__traits.html">channel_traits<Channel>::min_value</a>(); </div>
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<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> }</div>
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<div class="line"><a name="l00475"></a><span class="lineno"> 475</span> </div>
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<div class="line"><a name="l00476"></a><span class="lineno"> 476</span> <span class="comment">//#ifdef _MSC_VER</span></div>
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<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> <span class="comment">//#pragma warning(pop)</span></div>
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<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> <span class="comment">//#endif</span></div>
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<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> </div>
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<div class="line"><a name="l00480"></a><span class="lineno"> 480</span> } } <span class="comment">// namespace boost::gil</span></div>
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<div class="line"><a name="l00481"></a><span class="lineno"> 481</span> </div>
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<div class="line"><a name="l00482"></a><span class="lineno"> 482</span> <span class="preprocessor">#endif</span></div>
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<div class="ttc" id="group___channel_invert_algorithm_html_gabbbc7b27d9f61ff45cf5ea7ac21051f5"><div class="ttname"><a href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">boost::gil::channel_invert</a></div><div class="ttdeci">channel_traits< Channel >::value_type channel_invert(Channel x)</div><div class="ttdoc">Default implementation. Provide overloads for performance. </div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:472</div></div>
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<div class="ttc" id="structboost_1_1gil_1_1scoped__channel__value_html"><div class="ttname"><a href="structboost_1_1gil_1_1scoped__channel__value.html">boost::gil::scoped_channel_value</a></div><div class="ttdoc">A channel adaptor that modifies the range of the source channel. Models: ChannelValueConcept. </div><div class="ttdef"><b>Definition:</b> channel.hpp:155</div></div>
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<div class="ttc" id="group___channel_convert_algorithm_html_ga1ca10b1d27bc2f2ce4906b8890e613a5"><div class="ttname"><a href="group___channel_convert_algorithm.html#ga1ca10b1d27bc2f2ce4906b8890e613a5">boost::gil::channel_convert</a></div><div class="ttdeci">channel_traits< DstChannel >::value_type channel_convert(const SrcChannel &src)</div><div class="ttdoc">Converting from one channel type to another. </div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:375</div></div>
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<div class="ttc" id="channel_8hpp_html"><div class="ttname"><a href="channel_8hpp.html">channel.hpp</a></div><div class="ttdoc">Channel utilities. </div></div>
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<div class="ttc" id="group___channel_multiply_algorithm_html_ga0af81efbbb77846afe2570f242d2b974"><div class="ttname"><a href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">boost::gil::channel_multiply</a></div><div class="ttdeci">channel_traits< Channel >::value_type channel_multiply(Channel a, Channel b)</div><div class="ttdoc">A function multiplying two channels. result = a * b / max_value. </div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:450</div></div>
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<div class="ttc" id="structboost_1_1gil_1_1detail_1_1identity_html"><div class="ttname"><a href="structboost_1_1gil_1_1detail_1_1identity.html">boost::gil::detail::identity</a></div><div class="ttdoc">identity taken from SGI STL. </div><div class="ttdef"><b>Definition:</b> utilities.hpp:263</div></div>
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<div class="ttc" id="structboost_1_1gil_1_1default__channel__converter_html"><div class="ttname"><a href="structboost_1_1gil_1_1default__channel__converter.html">boost::gil::default_channel_converter</a></div><div class="ttdoc">Same as channel_converter, except it takes the destination channel by reference, which allows us to m...</div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:384</div></div>
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<div class="ttc" id="structboost_1_1gil_1_1channel__multiplier_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplier.html">boost::gil::channel_multiplier</a></div><div class="ttdoc">A function object to multiply two channels. result = a * b / max_value. </div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:439</div></div>
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<div class="ttc" id="structboost_1_1gil_1_1channel__multiplier__unsigned_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">boost::gil::channel_multiplier_unsigned</a></div><div class="ttdoc">This is the default implementation. Performance specializatons are provided. </div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:416</div></div>
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<div class="ttc" id="structboost_1_1gil_1_1channel__traits_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__traits.html">boost::gil::channel_traits</a></div><div class="ttdoc">Traits for channels. Contains the following members: </div><div class="ttdef"><b>Definition:</b> channel.hpp:113</div></div>
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<div class="ttc" id="gil__config_8hpp_html"><div class="ttname"><a href="gil__config_8hpp.html">gil_config.hpp</a></div><div class="ttdoc">GIL configuration file. </div></div>
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<div class="ttc" id="structboost_1_1gil_1_1detail_1_1channel__converter__unsigned__impl_html"><div class="ttname"><a href="structboost_1_1gil_1_1detail_1_1channel__converter__unsigned__impl.html">boost::gil::detail::channel_converter_unsigned_impl</a></div><div class="ttdoc">This is the default implementation. Performance specializatons are provided. </div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:46</div></div>
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<div class="ttc" id="structboost_1_1gil_1_1channel__converter_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__converter.html">boost::gil::channel_converter</a></div><div class="ttdoc">A unary function object converting between channel types. </div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:363</div></div>
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