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  47 <div class="title">channel_algorithm.hpp</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// Copyright 2005-2007 Adobe Systems Incorporated</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Distributed under the Boost Software License, Version 1.0</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">// See accompanying file LICENSE_1_0.txt or copy at</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">// http://www.boost.org/LICENSE_1_0.txt</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="preprocessor">#ifndef BOOST_GIL_GIL_CHANNEL_ALGORITHM_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_GIL_CHANNEL_ALGORITHM_HPP</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &lt;boost/gil/channel.hpp&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;boost/gil/promote_integral.hpp&gt;</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;boost/gil/typedefs.hpp&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;boost/gil/detail/is_channel_integral.hpp&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;boost/gil/detail/mp11.hpp&gt;</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;limits&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment">// some forward declarations</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcIsIntegral, <span class="keywordtype">bool</span> DstIsIntegral&gt;</div><div class="line"><a name="l00026"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1detail_1_1channel__converter__unsigned__impl.html">   26</a></span>&#160;<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><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcIsGreater&gt;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="keyword">struct </span>channel_converter_unsigned_integral;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcLessThanDst, <span class="keywordtype">bool</span> SrcDivisible&gt;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="keyword">struct </span>channel_converter_unsigned_integral_impl;</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcLessThanDst, <span class="keywordtype">bool</span> CannotFitInInteger&gt;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="keyword">struct </span>channel_converter_unsigned_integral_nondivisible;</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Un<span class="keywordtype">signed</span>IntegralChannel&gt;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keyword">struct </span>unsigned_integral_max_value</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;    : std::integral_constant</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    &lt;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        UnsignedIntegralChannel,</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;        (std::numeric_limits&lt;UnsignedIntegralChannel&gt;::max)()</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    &gt;</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;{};</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="keyword">struct </span>unsigned_integral_max_value&lt;uint8_t&gt;</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    : std::integral_constant&lt;uint32_t, 0xFF&gt;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;{};</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="keyword">struct </span>unsigned_integral_max_value&lt;uint16_t&gt;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    : std::integral_constant&lt;uint32_t, 0xFFFF&gt;</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;{};</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="keyword">struct </span>unsigned_integral_max_value&lt;uint32_t&gt;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    : std::integral_constant&lt;uintmax_t, 0xFFFFFFFF&gt;</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;{};</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K&gt;</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="keyword">struct </span>unsigned_integral_max_value&lt;packed_channel_value&lt;K&gt;&gt;</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    : std::integral_constant</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    &lt;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;        typename packed_channel_value&lt;K&gt;::integer_t,</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;        (uint64_t(1)&lt;&lt;K)-1</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    &gt;</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;{};</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;template &lt;typename UnsignedIntegralChannel&gt;</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;struct unsigned_integral_num_bits</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    : std::integral_constant&lt;int, sizeof(UnsignedIntegralChannel) * 8&gt;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;{};</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;template &lt;int K&gt;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;struct unsigned_integral_num_bits&lt;packed_channel_value&lt;K&gt;&gt;</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    : std::integral_constant&lt;int, K&gt;</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;{};</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;     <span class="comment">// Model ChannelValueConcept</span></div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;struct channel_converter_unsigned</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    : detail::channel_converter_unsigned_impl</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    &lt;</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        SrcChannelV,</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        DstChannelV,</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        detail::is_channel_integral&lt;SrcChannelV&gt;::value,</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        detail::is_channel_integral&lt;DstChannelV&gt;::value</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    &gt;</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;{};</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div><div class="line"><a name="l00138"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01_t_00_01_t_01_4.html">  138</a></span>&#160;template &lt;typename T&gt; struct channel_converter_unsigned&lt;T,T&gt; : public detail::identity&lt;T&gt; {};</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;namespace detail {</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV, bool SrcIsIntegral, bool DstIsIntegral&gt;</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;struct channel_converter_unsigned_impl {</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;    using argument_type = SrcChannelV;</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    using result_type = DstChannelV;</div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    DstChannelV operator()(SrcChannelV src) const {</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;        return DstChannelV(channel_traits&lt;DstChannelV&gt;::min_value() +</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;            (src - channel_traits&lt;SrcChannelV&gt;::min_value()) / channel_range&lt;SrcChannelV&gt;() * channel_range&lt;DstChannelV&gt;());</div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    }</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;private:</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    template &lt;typename C&gt;</div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;    static double channel_range() {</div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;        return double(channel_traits&lt;C&gt;::max_value()) - double(channel_traits&lt;C&gt;::min_value());</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    }</div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;};</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;<span class="comment">// When both the source and the destination are integral channels, perform a faster conversion</span></div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;struct channel_converter_unsigned_impl&lt;SrcChannelV, DstChannelV, true, true&gt;</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    : channel_converter_unsigned_integral</div><div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    &lt;</div><div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;        SrcChannelV,</div><div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;        DstChannelV,</div><div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;        mp11::mp_less</div><div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;        &lt;</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;            unsigned_integral_max_value&lt;SrcChannelV&gt;,</div><div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;            unsigned_integral_max_value&lt;DstChannelV&gt;</div><div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;        &gt;::value</div><div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;    &gt;</div><div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;{};</div><div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;</div><div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;</div><div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;</div><div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;struct channel_converter_unsigned_integral&lt;SrcChannelV,DstChannelV,true&gt;</div><div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    : public channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,true,</div><div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    !(unsigned_integral_max_value&lt;DstChannelV&gt;::value % unsigned_integral_max_value&lt;SrcChannelV&gt;::value) &gt; {};</div><div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;</div><div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;</div><div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;struct channel_converter_unsigned_integral&lt;SrcChannelV,DstChannelV,false&gt;</div><div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    : public channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,false,</div><div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;    !(unsigned_integral_max_value&lt;SrcChannelV&gt;::value % unsigned_integral_max_value&lt;DstChannelV&gt;::value) &gt; {};</div><div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;</div><div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;</div><div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;</div><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;<span class="comment">// Both source and destination are unsigned integral channels,</span></div><div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;<span class="comment">// the src max value is less than the dst max value,</span></div><div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;<span class="comment">// and the dst max value is divisible by the src max value</span></div><div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;</div><div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;struct channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,true,true&gt; {</div><div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    DstChannelV operator()(SrcChannelV src) const {</div><div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;        using integer_t = typename unsigned_integral_max_value&lt;DstChannelV&gt;::value_type;</div><div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;        static const integer_t mul = unsigned_integral_max_value&lt;DstChannelV&gt;::value / unsigned_integral_max_value&lt;SrcChannelV&gt;::value;</div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;        return DstChannelV(src * mul);</div><div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;    }</div><div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;};</div><div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;</div><div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;<span class="comment">// Both source and destination are unsigned integral channels,</span></div><div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;<span class="comment">// the dst max value is less than (or equal to) the src max value,</span></div><div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;<span class="comment">// and the src max value is divisible by the dst max value</span></div><div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;</div><div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;struct channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,false,true&gt; {</div><div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;    DstChannelV operator()(SrcChannelV src) const {</div><div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;        using integer_t = typename unsigned_integral_max_value&lt;SrcChannelV&gt;::value_type;</div><div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;        static const integer_t div = unsigned_integral_max_value&lt;SrcChannelV&gt;::value / unsigned_integral_max_value&lt;DstChannelV&gt;::value;</div><div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;        static const integer_t div2 = div/2;</div><div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;        return DstChannelV((src + div2) / div);</div><div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;    }</div><div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;};</div><div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;</div><div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;<span class="comment">// Prevent overflow for the largest integral type</span></div><div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;template &lt;typename DstChannelV&gt;</div><div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;struct channel_converter_unsigned_integral_impl&lt;uintmax_t,DstChannelV,false,true&gt; {</div><div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;    DstChannelV operator()(uintmax_t src) const {</div><div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;        static const uintmax_t div = unsigned_integral_max_value&lt;uint32_t&gt;::value / unsigned_integral_max_value&lt;DstChannelV&gt;::value;</div><div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;        static const uintmax_t div2 = div/2;</div><div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;        if (src &gt; unsigned_integral_max_value&lt;uintmax_t&gt;::value - div2)</div><div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;            return unsigned_integral_max_value&lt;DstChannelV&gt;::value;</div><div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;        return DstChannelV((src + div2) / div);</div><div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;    }</div><div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;};</div><div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;</div><div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;<span class="comment">// Both source and destination are unsigned integral channels,</span></div><div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;<span class="comment">// and the dst max value is not divisible by the src max value</span></div><div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;<span class="comment">// See if you can represent the expression (src * dst_max) / src_max in integral form</span></div><div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV, bool SrcLessThanDst&gt;</div><div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;struct channel_converter_unsigned_integral_impl&lt;SrcChannelV, DstChannelV, SrcLessThanDst, false&gt;</div><div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;    : channel_converter_unsigned_integral_nondivisible</div><div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;    &lt;</div><div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;        SrcChannelV,</div><div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;        DstChannelV,</div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;        SrcLessThanDst,</div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;        mp11::mp_less</div><div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;        &lt;</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;            unsigned_integral_num_bits&lt;uintmax_t&gt;,</div><div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;            mp11::mp_plus</div><div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;            &lt;</div><div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;                unsigned_integral_num_bits&lt;SrcChannelV&gt;,</div><div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;                unsigned_integral_num_bits&lt;DstChannelV&gt;</div><div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;            &gt;</div><div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;        &gt;::value</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    &gt;</div><div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;{};</div><div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;</div><div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;<span class="comment">// Both source and destination are unsigned integral channels,</span></div><div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;<span class="comment">// the src max value is less than the dst max value,</span></div><div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;<span class="comment">// and the dst max value is not divisible by the src max value</span></div><div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;<span class="comment">// The expression (src * dst_max) / src_max fits in an integer</span></div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;</div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;struct channel_converter_unsigned_integral_nondivisible&lt;SrcChannelV, DstChannelV, true, false&gt;</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;{</div><div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    DstChannelV operator()(SrcChannelV src) const</div><div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;    {</div><div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;        using dest_t = typename base_channel_type&lt;DstChannelV&gt;::type;</div><div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;        return DstChannelV(</div><div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;            static_cast&lt;dest_t&gt;(src * unsigned_integral_max_value&lt;DstChannelV&gt;::value)</div><div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;            / unsigned_integral_max_value&lt;SrcChannelV&gt;::value);</div><div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;    }</div><div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;};</div><div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;</div><div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;<span class="comment">// Both source and destination are unsigned integral channels,</span></div><div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;<span class="comment">// the src max value is less than the dst max value,</span></div><div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;<span class="comment">// and the dst max value is not divisible by the src max value</span></div><div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;<span class="comment">// The expression (src * dst_max) / src_max cannot fit in an integer (overflows). Use a double</span></div><div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV&gt;</div><div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;struct channel_converter_unsigned_integral_nondivisible&lt;SrcChannelV, DstChannelV, true, true&gt;</div><div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;{</div><div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;    DstChannelV operator()(SrcChannelV src) const</div><div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;    {</div><div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;        static const double mul</div><div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;            = unsigned_integral_max_value&lt;DstChannelV&gt;::value</div><div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;            / double(unsigned_integral_max_value&lt;SrcChannelV&gt;::value);</div><div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;        return DstChannelV(src * mul);</div><div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;    }</div><div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;};</div><div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;</div><div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;<span class="comment">// Both source and destination are unsigned integral channels,</span></div><div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;<span class="comment">// the dst max value is less than (or equal to) the src max value,</span></div><div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;<span class="comment">// and the src max value is not divisible by the dst max value</span></div><div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;template &lt;typename SrcChannelV, typename DstChannelV, bool CannotFit&gt;</div><div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;struct channel_converter_unsigned_integral_nondivisible&lt;SrcChannelV,DstChannelV,false,CannotFit&gt; {</div><div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;    DstChannelV operator()(SrcChannelV src) const {</div><div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;</div><div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;        using src_integer_t = typename detail::unsigned_integral_max_value&lt;SrcChannelV&gt;::value_type;</div><div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;        using dst_integer_t = typename detail::unsigned_integral_max_value&lt;DstChannelV&gt;::value_type;</div><div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;</div><div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;        static const double div = unsigned_integral_max_value&lt;SrcChannelV&gt;::value</div><div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;                                / static_cast&lt; double &gt;( unsigned_integral_max_value&lt;DstChannelV&gt;::value );</div><div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;</div><div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;        static const src_integer_t div2 = static_cast&lt; src_integer_t &gt;( div / 2.0 );</div><div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;</div><div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;        return DstChannelV( static_cast&lt; dst_integer_t &gt;(( static_cast&lt; double &gt;( src + div2 ) / div )));</div><div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;    }</div><div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;};</div><div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;</div><div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;</div><div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;</div><div class="line"><a name="l00312"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01float32__t_00_01_dst_channel_v_01_4.html">  312</a></span>&#160;template &lt;typename DstChannelV&gt; struct channel_converter_unsigned&lt;float32_t,DstChannelV&gt; {</div><div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;    using argument_type = float32_t;</div><div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;    using result_type = DstChannelV;</div><div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;    DstChannelV operator()(float32_t x) const</div><div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;    {</div><div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;        using dst_integer_t = typename detail::unsigned_integral_max_value&lt;DstChannelV&gt;::value_type;</div><div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;        return DstChannelV( static_cast&lt; dst_integer_t &gt;(x*channel_traits&lt;DstChannelV&gt;::max_value()+0.5f ));</div><div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;    }</div><div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;};</div><div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;</div><div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;template &lt;typename SrcChannelV&gt; struct channel_converter_unsigned&lt;SrcChannelV,float32_t&gt; {</div><div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;    using argument_type = float32_t;</div><div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;    using result_type = SrcChannelV;</div><div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;    float32_t operator()(SrcChannelV   x) const { return float32_t(x/float(channel_traits&lt;SrcChannelV&gt;::max_value())); }</div><div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;};</div><div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;</div><div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;template &lt;&gt; struct channel_converter_unsigned&lt;float32_t,float32_t&gt; {</div><div class="line"><a name="l00329"></a><span class="lineno">  329</span>&#160;    using argument_type = float32_t;</div><div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;    using result_type = float32_t;</div><div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;    float32_t operator()(float32_t   x) const { return x; }</div><div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;};</div><div class="line"><a name="l00333"></a><span class="lineno">  333</span>&#160;</div><div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;</div><div class="line"><a name="l00336"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01uint32__t_00_01float32__t_01_4.html">  336</a></span>&#160;template &lt;&gt; struct channel_converter_unsigned&lt;uint32_t,float32_t&gt; {</div><div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;    using argument_type = uint32_t;</div><div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;    using result_type = float32_t;</div><div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;    float32_t operator()(uint32_t x) const {</div><div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;        <span class="comment">// unfortunately without an explicit check it is possible to get a round-off error. We must ensure that max_value of uint32_t matches max_value of float32_t</span></div><div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;        if (x&gt;=channel_traits&lt;uint32_t&gt;::max_value()) return channel_traits&lt;float32_t&gt;::max_value();</div><div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;        return float(x) / float(channel_traits&lt;uint32_t&gt;::max_value());</div><div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;    }</div><div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;};</div><div class="line"><a name="l00346"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01float32__t_00_01uint32__t_01_4.html">  346</a></span>&#160;template &lt;&gt; struct channel_converter_unsigned&lt;float32_t,uint32_t&gt; {</div><div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;    <span class="keyword">using</span> argument_type = <a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div><div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;    <span class="keyword">using</span> result_type = uint32_t;</div><div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;    uint32_t operator()(<a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> x)<span class="keyword"> const </span>{</div><div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;        <span class="comment">// unfortunately without an explicit check it is possible to get a round-off error. We must ensure that max_value of uint32_t matches max_value of float32_t</span></div><div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;        <span class="keywordflow">if</span> (x&gt;=channel_traits&lt;float32_t&gt;::max_value())</div><div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;            <span class="keywordflow">return</span> channel_traits&lt;uint32_t&gt;::max_value();</div><div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;</div><div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;        <span class="keyword">auto</span> <span class="keyword">const</span> max_value = channel_traits&lt;uint32_t&gt;::max_value();</div><div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;        <span class="keyword">auto</span> <span class="keyword">const</span> result = x * static_cast&lt;float32_t::base_channel_t&gt;(max_value) + 0.5f;</div><div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;        <span class="keywordflow">return</span> static_cast&lt;uint32_t&gt;(result);</div><div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;    }</div><div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;};</div><div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;</div><div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;</div><div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;<span class="comment">// Converting from signed to unsigned integral channel.</span></div><div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;<span class="comment">// It is both a unary function, and a metafunction (thus requires the &#39;type&#39; nested alias, which equals result_type)</span></div><div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt;     <span class="comment">// Model ChannelValueConcept</span></div><div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;<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>&lt;ChannelValue&gt; {</div><div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;    <span class="keyword">using</span> type = ChannelValue;</div><div class="line"><a name="l00368"></a><span class="lineno">  368</span>&#160;};</div><div class="line"><a name="l00369"></a><span class="lineno">  369</span>&#160;</div><div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;<span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_convert_to_unsigned&lt;int8_t&gt; {</div><div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;    <span class="keyword">using</span> argument_type = int8_t;</div><div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;    <span class="keyword">using</span> result_type = uint8_t;</div><div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160;    <span class="keyword">using</span> type = uint8_t;</div><div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;    type operator()(int8_t val)<span class="keyword"> const </span>{</div><div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;        <span class="keywordflow">return</span> static_cast&lt;uint8_t&gt;(static_cast&lt;uint32_t&gt;(val) + 128u);</div><div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;    }</div><div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;};</div><div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160;</div><div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;<span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_convert_to_unsigned&lt;int16_t&gt; {</div><div class="line"><a name="l00380"></a><span class="lineno">  380</span>&#160;    <span class="keyword">using</span> argument_type = int16_t;</div><div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160;    <span class="keyword">using</span> result_type = uint16_t;</div><div class="line"><a name="l00382"></a><span class="lineno">  382</span>&#160;    <span class="keyword">using</span> type = uint16_t;</div><div class="line"><a name="l00383"></a><span class="lineno">  383</span>&#160;    type operator()(int16_t val)<span class="keyword"> const </span>{</div><div class="line"><a name="l00384"></a><span class="lineno">  384</span>&#160;        <span class="keywordflow">return</span> static_cast&lt;uint16_t&gt;(static_cast&lt;uint32_t&gt;(val) + 32768u);</div><div class="line"><a name="l00385"></a><span class="lineno">  385</span>&#160;    }</div><div class="line"><a name="l00386"></a><span class="lineno">  386</span>&#160;};</div><div class="line"><a name="l00387"></a><span class="lineno">  387</span>&#160;</div><div class="line"><a name="l00388"></a><span class="lineno">  388</span>&#160;<span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_convert_to_unsigned&lt;int32_t&gt; {</div><div class="line"><a name="l00389"></a><span class="lineno">  389</span>&#160;    <span class="keyword">using</span> argument_type = int32_t;</div><div class="line"><a name="l00390"></a><span class="lineno">  390</span>&#160;    <span class="keyword">using</span> result_type = uint32_t;</div><div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;    <span class="keyword">using</span> type = uint32_t;</div><div class="line"><a name="l00392"></a><span class="lineno">  392</span>&#160;    type operator()(int32_t val)<span class="keyword"> const </span>{</div><div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;        <span class="keywordflow">return</span> static_cast&lt;uint32_t&gt;(val)+(1u&lt;&lt;31);</div><div class="line"><a name="l00394"></a><span class="lineno">  394</span>&#160;    }</div><div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;};</div><div class="line"><a name="l00396"></a><span class="lineno">  396</span>&#160;</div><div class="line"><a name="l00397"></a><span class="lineno">  397</span>&#160;</div><div class="line"><a name="l00398"></a><span class="lineno">  398</span>&#160;<span class="comment">// Converting from unsigned to signed integral channel</span></div><div class="line"><a name="l00399"></a><span class="lineno">  399</span>&#160;<span class="comment">// It is both a unary function, and a metafunction (thus requires the &#39;type&#39; nested alias, which equals result_type)</span></div><div class="line"><a name="l00400"></a><span class="lineno">  400</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt;     <span class="comment">// Model ChannelValueConcept</span></div><div class="line"><a name="l00401"></a><span class="lineno">  401</span>&#160;<span class="keyword">struct </span>channel_convert_from_unsigned : <span class="keyword">public</span> detail::identity&lt;ChannelValue&gt; {</div><div class="line"><a name="l00402"></a><span class="lineno">  402</span>&#160;    <span class="keyword">using</span> type = ChannelValue;</div><div class="line"><a name="l00403"></a><span class="lineno">  403</span>&#160;};</div><div class="line"><a name="l00404"></a><span class="lineno">  404</span>&#160;</div><div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;<span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_convert_from_unsigned&lt;int8_t&gt; {</div><div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;    <span class="keyword">using</span> argument_type = uint8_t;</div><div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;    <span class="keyword">using</span> result_type = int8_t;</div><div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;    <span class="keyword">using</span> type = int8_t;</div><div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;    type  operator()(uint8_t val)<span class="keyword"> const </span>{</div><div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;        <span class="keywordflow">return</span> static_cast&lt;int8_t&gt;(static_cast&lt;int32_t&gt;(val) - 128);</div><div class="line"><a name="l00411"></a><span class="lineno">  411</span>&#160;    }</div><div class="line"><a name="l00412"></a><span class="lineno">  412</span>&#160;};</div><div class="line"><a name="l00413"></a><span class="lineno">  413</span>&#160;</div><div class="line"><a name="l00414"></a><span class="lineno">  414</span>&#160;<span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_convert_from_unsigned&lt;int16_t&gt; {</div><div class="line"><a name="l00415"></a><span class="lineno">  415</span>&#160;    <span class="keyword">using</span> argument_type = uint16_t;</div><div class="line"><a name="l00416"></a><span class="lineno">  416</span>&#160;    <span class="keyword">using</span> result_type = int16_t;</div><div class="line"><a name="l00417"></a><span class="lineno">  417</span>&#160;    <span class="keyword">using</span> type = int16_t;</div><div class="line"><a name="l00418"></a><span class="lineno">  418</span>&#160;    type operator()(uint16_t val)<span class="keyword"> const </span>{</div><div class="line"><a name="l00419"></a><span class="lineno">  419</span>&#160;        <span class="keywordflow">return</span> static_cast&lt;int16_t&gt;(static_cast&lt;int32_t&gt;(val) - 32768);</div><div class="line"><a name="l00420"></a><span class="lineno">  420</span>&#160;    }</div><div class="line"><a name="l00421"></a><span class="lineno">  421</span>&#160;};</div><div class="line"><a name="l00422"></a><span class="lineno">  422</span>&#160;</div><div class="line"><a name="l00423"></a><span class="lineno">  423</span>&#160;<span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_convert_from_unsigned&lt;int32_t&gt; {</div><div class="line"><a name="l00424"></a><span class="lineno">  424</span>&#160;    <span class="keyword">using</span> argument_type = uint32_t;</div><div class="line"><a name="l00425"></a><span class="lineno">  425</span>&#160;    <span class="keyword">using</span> result_type = int32_t;</div><div class="line"><a name="l00426"></a><span class="lineno">  426</span>&#160;    <span class="keyword">using</span> type = int32_t;</div><div class="line"><a name="l00427"></a><span class="lineno">  427</span>&#160;    type operator()(uint32_t val)<span class="keyword"> const </span>{</div><div class="line"><a name="l00428"></a><span class="lineno">  428</span>&#160;        <span class="keywordflow">return</span> static_cast&lt;int32_t&gt;(val - (1u&lt;&lt;31));</div><div class="line"><a name="l00429"></a><span class="lineno">  429</span>&#160;    }</div><div class="line"><a name="l00430"></a><span class="lineno">  430</span>&#160;};</div><div class="line"><a name="l00431"></a><span class="lineno">  431</span>&#160;</div><div class="line"><a name="l00432"></a><span class="lineno">  432</span>&#160;}   <span class="comment">// namespace detail</span></div><div class="line"><a name="l00433"></a><span class="lineno">  433</span>&#160;</div><div class="line"><a name="l00436"></a><span class="lineno">  436</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt; <span class="comment">// Model ChannelValueConcept</span></div><div class="line"><a name="l00437"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter.html">  437</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__converter.html">channel_converter</a> {</div><div class="line"><a name="l00438"></a><span class="lineno">  438</span>&#160;    <span class="keyword">using</span> argument_type = SrcChannelV;</div><div class="line"><a name="l00439"></a><span class="lineno">  439</span>&#160;    <span class="keyword">using</span> result_type = DstChannelV;</div><div class="line"><a name="l00440"></a><span class="lineno">  440</span>&#160;    DstChannelV operator()(<span class="keyword">const</span> SrcChannelV&amp; src)<span class="keyword"> const </span>{</div><div class="line"><a name="l00441"></a><span class="lineno">  441</span>&#160;        <span class="keyword">using</span> to_unsigned = detail::channel_convert_to_unsigned&lt;SrcChannelV&gt;;</div><div class="line"><a name="l00442"></a><span class="lineno">  442</span>&#160;        <span class="keyword">using</span> from_unsigned = detail::channel_convert_from_unsigned&lt;DstChannelV&gt;;</div><div class="line"><a name="l00443"></a><span class="lineno">  443</span>&#160;        <span class="keyword">using</span> converter_unsigned = channel_converter_unsigned&lt;typename to_unsigned::result_type, typename from_unsigned::argument_type&gt;;</div><div class="line"><a name="l00444"></a><span class="lineno">  444</span>&#160;        <span class="keywordflow">return</span> from_unsigned()(converter_unsigned()(to_unsigned()(src)));</div><div class="line"><a name="l00445"></a><span class="lineno">  445</span>&#160;    }</div><div class="line"><a name="l00446"></a><span class="lineno">  446</span>&#160;};</div><div class="line"><a name="l00447"></a><span class="lineno">  447</span>&#160;</div><div class="line"><a name="l00450"></a><span class="lineno">  450</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> DstChannel, <span class="keyword">typename</span> SrcChannel&gt; <span class="comment">// Model ChannelConcept (could be channel references)</span></div><div class="line"><a name="l00451"></a><span class="lineno"><a class="line" href="group___channel_convert_algorithm.html#ga1ca10b1d27bc2f2ce4906b8890e613a5">  451</a></span>&#160;<span class="keyword">inline</span> <span class="keyword">typename</span> channel_traits&lt;DstChannel&gt;::value_type <a class="code" href="group___channel_convert_algorithm.html#ga1ca10b1d27bc2f2ce4906b8890e613a5">channel_convert</a>(<span class="keyword">const</span> SrcChannel&amp; src) {</div><div class="line"><a name="l00452"></a><span class="lineno">  452</span>&#160;    <span class="keywordflow">return</span> <a class="code" href="structboost_1_1gil_1_1channel__converter.html">channel_converter&lt;typename channel_traits&lt;SrcChannel&gt;::value_type</a>,</div><div class="line"><a name="l00453"></a><span class="lineno">  453</span>&#160;                             <span class="keyword">typename</span> channel_traits&lt;DstChannel&gt;::value_type&gt;()(src);</div><div class="line"><a name="l00454"></a><span class="lineno">  454</span>&#160;}</div><div class="line"><a name="l00455"></a><span class="lineno">  455</span>&#160;</div><div class="line"><a name="l00460"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__channel__converter.html">  460</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__channel__converter.html">default_channel_converter</a> {</div><div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Ch1, <span class="keyword">typename</span> Ch2&gt;</div><div class="line"><a name="l00462"></a><span class="lineno">  462</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> Ch1&amp; src, Ch2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160;        dst=channel_convert&lt;Ch2&gt;(src);</div><div class="line"><a name="l00464"></a><span class="lineno">  464</span>&#160;    }</div><div class="line"><a name="l00465"></a><span class="lineno">  465</span>&#160;};</div><div class="line"><a name="l00466"></a><span class="lineno">  466</span>&#160;</div><div class="line"><a name="l00467"></a><span class="lineno">  467</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00468"></a><span class="lineno">  468</span>&#160;    <span class="comment">// fast integer division by 255</span></div><div class="line"><a name="l00469"></a><span class="lineno">  469</span>&#160;    <span class="keyword">inline</span> uint32_t div255(uint32_t in) { uint32_t tmp=in+128; <span class="keywordflow">return</span> (tmp + (tmp&gt;&gt;8))&gt;&gt;8; }</div><div class="line"><a name="l00470"></a><span class="lineno">  470</span>&#160;</div><div class="line"><a name="l00471"></a><span class="lineno">  471</span>&#160;    <span class="comment">// fast integer divison by 32768</span></div><div class="line"><a name="l00472"></a><span class="lineno">  472</span>&#160;    <span class="keyword">inline</span> uint32_t div32768(uint32_t in) { <span class="keywordflow">return</span> (in+16384)&gt;&gt;15; }</div><div class="line"><a name="l00473"></a><span class="lineno">  473</span>&#160;}</div><div class="line"><a name="l00474"></a><span class="lineno">  474</span>&#160;</div><div class="line"><a name="l00487"></a><span class="lineno">  487</span>&#160;</div><div class="line"><a name="l00489"></a><span class="lineno">  489</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt;</div><div class="line"><a name="l00490"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">  490</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a> {</div><div class="line"><a name="l00491"></a><span class="lineno">  491</span>&#160;    <span class="keyword">using</span> first_argument_type = ChannelValue;</div><div class="line"><a name="l00492"></a><span class="lineno">  492</span>&#160;    <span class="keyword">using</span> second_argument_type = ChannelValue;</div><div class="line"><a name="l00493"></a><span class="lineno">  493</span>&#160;    <span class="keyword">using</span> result_type = ChannelValue;</div><div class="line"><a name="l00494"></a><span class="lineno">  494</span>&#160;    ChannelValue operator()(ChannelValue a, ChannelValue b)<span class="keyword"> const </span>{</div><div class="line"><a name="l00495"></a><span class="lineno">  495</span>&#160;        <span class="keywordflow">return</span> ChannelValue(<span class="keyword">static_cast&lt;</span>typename base_channel_type&lt;ChannelValue&gt;::type<span class="keyword">&gt;</span>(a / <span class="keywordtype">double</span>(channel_traits&lt;ChannelValue&gt;::max_value()) * b));</div><div class="line"><a name="l00496"></a><span class="lineno">  496</span>&#160;    }</div><div class="line"><a name="l00497"></a><span class="lineno">  497</span>&#160;};</div><div class="line"><a name="l00498"></a><span class="lineno">  498</span>&#160;</div><div class="line"><a name="l00500"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint8__t_01_4.html">  500</a></span>&#160;<span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a>&lt;uint8_t&gt; {</div><div class="line"><a name="l00501"></a><span class="lineno">  501</span>&#160;    <span class="keyword">using</span> first_argument_type = uint8_t;</div><div class="line"><a name="l00502"></a><span class="lineno">  502</span>&#160;    <span class="keyword">using</span> second_argument_type = uint8_t;</div><div class="line"><a name="l00503"></a><span class="lineno">  503</span>&#160;    <span class="keyword">using</span> result_type = uint8_t;</div><div class="line"><a name="l00504"></a><span class="lineno">  504</span>&#160;    uint8_t operator()(uint8_t a, uint8_t b)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> uint8_t(detail::div255(uint32_t(a) * uint32_t(b))); }</div><div class="line"><a name="l00505"></a><span class="lineno">  505</span>&#160;};</div><div class="line"><a name="l00506"></a><span class="lineno">  506</span>&#160;</div><div class="line"><a name="l00508"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint16__t_01_4.html">  508</a></span>&#160;<span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a>&lt;uint16_t&gt; {</div><div class="line"><a name="l00509"></a><span class="lineno">  509</span>&#160;    <span class="keyword">using</span> first_argument_type = uint16_t;</div><div class="line"><a name="l00510"></a><span class="lineno">  510</span>&#160;    <span class="keyword">using</span> second_argument_type = uint16_t;</div><div class="line"><a name="l00511"></a><span class="lineno">  511</span>&#160;    <span class="keyword">using</span> result_type = uint16_t;</div><div class="line"><a name="l00512"></a><span class="lineno">  512</span>&#160;    uint16_t operator()(uint16_t a, uint16_t b)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> uint16_t((uint32_t(a) * uint32_t(b))/65535); }</div><div class="line"><a name="l00513"></a><span class="lineno">  513</span>&#160;};</div><div class="line"><a name="l00514"></a><span class="lineno">  514</span>&#160;</div><div class="line"><a name="l00516"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01float32__t_01_4.html">  516</a></span>&#160;<span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a>&lt;<a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>&gt; {</div><div class="line"><a name="l00517"></a><span class="lineno">  517</span>&#160;    <span class="keyword">using</span> first_argument_type = <a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div><div class="line"><a name="l00518"></a><span class="lineno">  518</span>&#160;    <span class="keyword">using</span> second_argument_type = <a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div><div class="line"><a name="l00519"></a><span class="lineno">  519</span>&#160;    <span class="keyword">using</span> result_type = <a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div><div class="line"><a name="l00520"></a><span class="lineno">  520</span>&#160;    <a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> operator()(<a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> a, <a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> b)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> a*b; }</div><div class="line"><a name="l00521"></a><span class="lineno">  521</span>&#160;};</div><div class="line"><a name="l00522"></a><span class="lineno">  522</span>&#160;</div><div class="line"><a name="l00524"></a><span class="lineno">  524</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt;</div><div class="line"><a name="l00525"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier.html">  525</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplier.html">channel_multiplier</a> {</div><div class="line"><a name="l00526"></a><span class="lineno">  526</span>&#160;    <span class="keyword">using</span> first_argument_type = ChannelValue;</div><div class="line"><a name="l00527"></a><span class="lineno">  527</span>&#160;    <span class="keyword">using</span> second_argument_type = ChannelValue;</div><div class="line"><a name="l00528"></a><span class="lineno">  528</span>&#160;    <span class="keyword">using</span> result_type = ChannelValue;</div><div class="line"><a name="l00529"></a><span class="lineno">  529</span>&#160;    ChannelValue operator()(ChannelValue a, ChannelValue b)<span class="keyword"> const </span>{</div><div class="line"><a name="l00530"></a><span class="lineno">  530</span>&#160;        <span class="keyword">using</span> to_unsigned = detail::channel_convert_to_unsigned&lt;ChannelValue&gt;;</div><div class="line"><a name="l00531"></a><span class="lineno">  531</span>&#160;        <span class="keyword">using</span> from_unsigned = detail::channel_convert_from_unsigned&lt;ChannelValue&gt;;</div><div class="line"><a name="l00532"></a><span class="lineno">  532</span>&#160;        <span class="keyword">using</span> multiplier_unsigned = <a class="code" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned&lt;typename to_unsigned::result_type&gt;</a>;</div><div class="line"><a name="l00533"></a><span class="lineno">  533</span>&#160;        <span class="keywordflow">return</span> from_unsigned()(multiplier_unsigned()(to_unsigned()(a), to_unsigned()(b)));</div><div class="line"><a name="l00534"></a><span class="lineno">  534</span>&#160;    }</div><div class="line"><a name="l00535"></a><span class="lineno">  535</span>&#160;};</div><div class="line"><a name="l00536"></a><span class="lineno">  536</span>&#160;</div><div class="line"><a name="l00538"></a><span class="lineno">  538</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel&gt; <span class="comment">// Models ChannelConcept (could be a channel reference)</span></div><div class="line"><a name="l00539"></a><span class="lineno"><a class="line" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">  539</a></span>&#160;<span class="keyword">inline</span> <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::value_type <a class="code" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">channel_multiply</a>(Channel a, Channel b) {</div><div class="line"><a name="l00540"></a><span class="lineno">  540</span>&#160;    <span class="keywordflow">return</span> <a class="code" href="structboost_1_1gil_1_1channel__multiplier.html">channel_multiplier&lt;typename channel_traits&lt;Channel&gt;::value_type</a>&gt;()(a,b);</div><div class="line"><a name="l00541"></a><span class="lineno">  541</span>&#160;}</div><div class="line"><a name="l00543"></a><span class="lineno">  543</span>&#160;</div><div class="line"><a name="l00555"></a><span class="lineno">  555</span>&#160;</div><div class="line"><a name="l00558"></a><span class="lineno">  558</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel&gt; <span class="comment">// Models ChannelConcept (could be a channel reference)</span></div><div class="line"><a name="l00559"></a><span class="lineno"><a class="line" href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">  559</a></span>&#160;<span class="keyword">inline</span> <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::value_type <a class="code" href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">channel_invert</a>(Channel x) {</div><div class="line"><a name="l00560"></a><span class="lineno">  560</span>&#160;</div><div class="line"><a name="l00561"></a><span class="lineno">  561</span>&#160;    <span class="keyword">using</span> base_t = <span class="keyword">typename</span> base_channel_type&lt;Channel&gt;::type;</div><div class="line"><a name="l00562"></a><span class="lineno">  562</span>&#160;    <span class="keyword">using</span> promoted_t = <span class="keyword">typename</span> promote_integral&lt;base_t&gt;::type;</div><div class="line"><a name="l00563"></a><span class="lineno">  563</span>&#160;    promoted_t <span class="keyword">const</span> promoted_x = x;</div><div class="line"><a name="l00564"></a><span class="lineno">  564</span>&#160;    promoted_t <span class="keyword">const</span> promoted_max = channel_traits&lt;Channel&gt;::max_value();</div><div class="line"><a name="l00565"></a><span class="lineno">  565</span>&#160;    promoted_t <span class="keyword">const</span> promoted_min = channel_traits&lt;Channel&gt;::min_value();</div><div class="line"><a name="l00566"></a><span class="lineno">  566</span>&#160;    promoted_t <span class="keyword">const</span> promoted_inverted_x = promoted_max - promoted_x + promoted_min;</div><div class="line"><a name="l00567"></a><span class="lineno">  567</span>&#160;    <span class="keyword">auto</span> <span class="keyword">const</span> inverted_x = static_cast&lt;base_t&gt;(promoted_inverted_x);</div><div class="line"><a name="l00568"></a><span class="lineno">  568</span>&#160;    <span class="keywordflow">return</span> inverted_x;</div><div class="line"><a name="l00569"></a><span class="lineno">  569</span>&#160;}</div><div class="line"><a name="l00570"></a><span class="lineno">  570</span>&#160;</div><div class="line"><a name="l00571"></a><span class="lineno">  571</span>&#160;} }  <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00572"></a><span class="lineno">  572</span>&#160;</div><div class="line"><a name="l00573"></a><span class="lineno">  573</span>&#160;<span class="preprocessor">#endif</span></div><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&lt; Channel &gt;::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:559</div></div>
  51 <div class="ttc" id="group___channel_model_html_gaa70e2f51d4342cd54a28684f20c6135b"><div class="ttname"><a href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">boost::gil::float32_t</a></div><div class="ttdeci">scoped_channel_value&lt; float, float_point_zero&lt; float &gt;, float_point_one&lt; float &gt; &gt; float32_t</div><div class="ttdoc">32-bit floating point channel type with range [0.0f ... 1.0f]. Models ChannelValueConcept</div><div class="ttdef"><b>Definition:</b> typedefs.hpp:124</div></div>
  52 <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&lt; DstChannel &gt;::value_type channel_convert(const SrcChannel &amp;src)</div><div class="ttdoc">Converting from one channel type to another.</div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:451</div></div>
  53 <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&lt; Channel &gt;::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:539</div></div>
  54 <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:209</div></div>
  55 <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:460</div></div>
  56 <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:525</div></div>
  57 <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:490</div></div>
  58 <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:26</div></div>
  59 <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:437</div></div>
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