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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">//</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// Copyright 2005-2007 Adobe Systems Incorporated</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">//</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment">// Distributed under the Boost Software License, Version 1.0</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">// See accompanying file LICENSE_1_0.txt or copy at</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">// http://www.boost.org/LICENSE_1_0.txt</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">//</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#ifndef BOOST_GIL_GIL_CHANNEL_ALGORITHM_HPP</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#define BOOST_GIL_GIL_CHANNEL_ALGORITHM_HPP</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include &lt;boost/gil/channel.hpp&gt;</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include &lt;boost/gil/promote_integral.hpp&gt;</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include &lt;boost/gil/typedefs.hpp&gt;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include &lt;boost/gil/detail/is_channel_integral.hpp&gt;</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#include &lt;boost/gil/detail/mp11.hpp&gt;</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include &lt;limits&gt;</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include &lt;type_traits&gt;</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> </div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment">// some forward declarations</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><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 id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="keyword">struct </span>channel_converter_unsigned_impl;</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><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 id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="keyword">struct </span>channel_converter_unsigned_integral;</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><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 id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="keyword">struct </span>channel_converter_unsigned_integral_impl;</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><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 id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="keyword">struct </span>channel_converter_unsigned_integral_nondivisible;</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Un<span class="keywordtype">signed</span>IntegralChannel&gt;</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="keyword">struct </span>unsigned_integral_max_value</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> : std::integral_constant</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> &lt;</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> UnsignedIntegralChannel,</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> (std::numeric_limits&lt;UnsignedIntegralChannel&gt;::max)()</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> &gt;</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span>{};</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="keyword">template</span> &lt;&gt;</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="keyword">struct </span>unsigned_integral_max_value&lt;uint8_t&gt;</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> : std::integral_constant&lt;uint32_t, 0xFF&gt;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>{};</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="keyword">template</span> &lt;&gt;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="keyword">struct </span>unsigned_integral_max_value&lt;uint16_t&gt;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> : std::integral_constant&lt;uint32_t, 0xFFFF&gt;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span>{};</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="keyword">template</span> &lt;&gt;</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="keyword">struct </span>unsigned_integral_max_value&lt;uint32_t&gt;</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> : std::integral_constant&lt;uintmax_t, 0xFFFFFFFF&gt;</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span>{};</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K&gt;</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="keyword">struct </span>unsigned_integral_max_value&lt;packed_channel_value&lt;K&gt;&gt;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> : std::integral_constant</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> &lt;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> typename packed_channel_value&lt;K&gt;::integer_t,</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> (uint64_t(1)&lt;&lt;K)-1</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> &gt;</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span>{};</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span>template &lt;typename UnsignedIntegralChannel&gt;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span>struct unsigned_integral_num_bits</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> : std::integral_constant&lt;int, static_cast&lt;int&gt;(sizeof(UnsignedIntegralChannel) * 8)&gt;</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>{};</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span>template &lt;int K&gt;</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span>struct unsigned_integral_num_bits&lt;packed_channel_value&lt;K&gt;&gt;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> : std::integral_constant&lt;int, K&gt;</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span>{};</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> </div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span>template &lt;typename SrcChannelV, typename DstChannelV&gt; <span class="comment">// Model ChannelValueConcept</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span>struct channel_converter_unsigned</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> : detail::channel_converter_unsigned_impl</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> &lt;</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> SrcChannelV,</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> DstChannelV,</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> detail::is_channel_integral&lt;SrcChannelV&gt;::value,</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> detail::is_channel_integral&lt;DstChannelV&gt;::value</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> &gt;</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span>{};</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a id="l00138" 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>template &lt;typename T&gt; struct channel_converter_unsigned&lt;T,T&gt; : public detail::identity&lt;T&gt; {};</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span>namespace detail {</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> </div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> </div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span>template &lt;typename SrcChannelV, typename DstChannelV, bool SrcIsIntegral, bool DstIsIntegral&gt;</div>
<div class="foldopen" id="foldopen00148" data-start="{" data-end="};">
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1detail_1_1channel__converter__unsigned__impl.html"> 148</a></span>struct channel_converter_unsigned_impl {</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> using argument_type = SrcChannelV;</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> using result_type = DstChannelV;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> auto operator()(SrcChannelV src) const -&gt; DstChannelV</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> {</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> return DstChannelV(channel_traits&lt;DstChannelV&gt;::min_value() +</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> (src - channel_traits&lt;SrcChannelV&gt;::min_value()) / channel_range&lt;SrcChannelV&gt;() * channel_range&lt;DstChannelV&gt;());</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> }</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> </div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span>private:</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> template &lt;typename C&gt;</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> static auto channel_range() -&gt; double</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> {</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <span class="keywordflow">return</span> double(channel_traits&lt;C&gt;::max_value()) - double(channel_traits&lt;C&gt;::min_value());</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> }</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span>};</div>
</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> </div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span><span class="comment">// When both the source and the destination are integral channels, perform a faster conversion</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span><span class="keyword">struct </span>channel_converter_unsigned_impl&lt;SrcChannelV, DstChannelV, true, true&gt;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> : channel_converter_unsigned_integral</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> &lt;</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> SrcChannelV,</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> DstChannelV,</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> mp11::mp_less</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> &lt;</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> unsigned_integral_max_value&lt;SrcChannelV&gt;,</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> unsigned_integral_max_value&lt;DstChannelV&gt;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> &gt;::value</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> &gt;</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span>{};</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> </div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span><span class="keyword">struct </span>channel_converter_unsigned_integral&lt;SrcChannelV,DstChannelV,true&gt;</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> : <span class="keyword">public</span> channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,true,</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> !(unsigned_integral_max_value&lt;DstChannelV&gt;::value % unsigned_integral_max_value&lt;SrcChannelV&gt;::value) &gt; {};</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span><span class="keyword">struct </span>channel_converter_unsigned_integral&lt;SrcChannelV,DstChannelV,false&gt;</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> : <span class="keyword">public</span> channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,false,</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> !(unsigned_integral_max_value&lt;SrcChannelV&gt;::value % unsigned_integral_max_value&lt;DstChannelV&gt;::value) &gt; {};</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> </div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> </div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span><span class="comment">// Both source and destination are unsigned integral channels,</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span><span class="comment">// the src max value is less than the dst max value,</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span><span class="comment">// and the dst max value is divisible by the src max value</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span><span class="keyword">struct </span>channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,true,true&gt; {</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <span class="keyword">auto</span> operator()(SrcChannelV src) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> {</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> <span class="keyword">using </span>integer_t = <span class="keyword">typename</span> unsigned_integral_max_value&lt;DstChannelV&gt;::value_type;</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> <span class="keyword">static</span> <span class="keyword">const</span> integer_t mul = unsigned_integral_max_value&lt;DstChannelV&gt;::value / unsigned_integral_max_value&lt;SrcChannelV&gt;::value;</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> <span class="keywordflow">return</span> DstChannelV(src * mul);</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> }</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span>};</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> </div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span><span class="comment">// Both source and destination are unsigned integral channels,</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span><span class="comment">// the dst max value is less than (or equal to) the src max value,</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span><span class="comment">// and the src max value is divisible by the dst max value</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span><span class="keyword">struct </span>channel_converter_unsigned_integral_impl&lt;SrcChannelV,DstChannelV,false,true&gt; {</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> <span class="keyword">auto</span> operator()(SrcChannelV src) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span> {</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span> <span class="keyword">using </span>integer_t = <span class="keyword">typename</span> unsigned_integral_max_value&lt;SrcChannelV&gt;::value_type;</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> <span class="keyword">static</span> <span class="keyword">const</span> integer_t div = unsigned_integral_max_value&lt;SrcChannelV&gt;::value / unsigned_integral_max_value&lt;DstChannelV&gt;::value;</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span> <span class="keyword">static</span> <span class="keyword">const</span> integer_t div2 = div/2;</div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span> <span class="keywordflow">return</span> DstChannelV((src + div2) / div);</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span> }</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span>};</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span> </div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span><span class="comment">// Prevent overflow for the largest integral type</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span><span class="keyword">struct </span>channel_converter_unsigned_integral_impl&lt;uintmax_t,DstChannelV,false,true&gt; {</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> <span class="keyword">auto</span> operator()(uintmax_t src) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span> {</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span> <span class="keyword">static</span> <span class="keyword">const</span> 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 id="l00232" name="l00232"></a><span class="lineno"> 232</span> <span class="keyword">static</span> <span class="keyword">const</span> uintmax_t div2 = div/2;</div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span> <span class="keywordflow">if</span> (src &gt; unsigned_integral_max_value&lt;uintmax_t&gt;::value - div2)</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span> <span class="keywordflow">return</span> unsigned_integral_max_value&lt;DstChannelV&gt;::value;</div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span> <span class="keywordflow">return</span> DstChannelV((src + div2) / div);</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span> }</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span>};</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span> </div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span><span class="comment">// Both source and destination are unsigned integral channels,</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span><span class="comment">// and the dst max value is not divisible by the src max value</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span><span class="comment">// See if you can represent the expression (src * dst_max) / src_max in integral form</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> SrcLessThanDst&gt;</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span><span class="keyword">struct </span>channel_converter_unsigned_integral_impl&lt;SrcChannelV, DstChannelV, SrcLessThanDst, false&gt;</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span> : channel_converter_unsigned_integral_nondivisible</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span> &lt;</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span> SrcChannelV,</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span> DstChannelV,</div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span> SrcLessThanDst,</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span> mp11::mp_less</div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span> &lt;</div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span> unsigned_integral_num_bits&lt;uintmax_t&gt;,</div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span> mp11::mp_plus</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span> &lt;</div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"> 254</span> unsigned_integral_num_bits&lt;SrcChannelV&gt;,</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno"> 255</span> unsigned_integral_num_bits&lt;DstChannelV&gt;</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno"> 256</span> &gt;</div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno"> 257</span> &gt;::value</div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"> 258</span> &gt;</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span>{};</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span> </div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span><span class="comment">// Both source and destination are unsigned integral channels,</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span><span class="comment">// the src max value is less than the dst max value,</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span><span class="comment">// and the dst max value is not divisible by the src max value</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span><span class="comment">// The expression (src * dst_max) / src_max fits in an integer</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"> 265</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span><span class="keyword">struct </span>channel_converter_unsigned_integral_nondivisible&lt;SrcChannelV, DstChannelV, true, false&gt;</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span>{</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span> <span class="keyword">auto</span> operator()(SrcChannelV src) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span> {</div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span> <span class="keyword">using </span>dest_t = <span class="keyword">typename</span> base_channel_type&lt;DstChannelV&gt;::type;</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span> <span class="keywordflow">return</span> DstChannelV(</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span> <span class="keyword">static_cast&lt;</span>dest_t<span class="keyword">&gt;</span>(src * unsigned_integral_max_value&lt;DstChannelV&gt;::value)</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span> / unsigned_integral_max_value&lt;SrcChannelV&gt;::value);</div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span> }</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span>};</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span> </div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span><span class="comment">// Both source and destination are unsigned integral channels,</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span><span class="comment">// the src max value is less than the dst max value,</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span><span class="comment">// and the dst max value is not divisible by the src max value</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span><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 id="l00281" name="l00281"></a><span class="lineno"> 281</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV&gt;</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span><span class="keyword">struct </span>channel_converter_unsigned_integral_nondivisible&lt;SrcChannelV, DstChannelV, true, true&gt;</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span>{</div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span> <span class="keyword">auto</span> operator()(SrcChannelV src) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span> {</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">double</span> mul</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span> = unsigned_integral_max_value&lt;DstChannelV&gt;::value</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span> / double(unsigned_integral_max_value&lt;SrcChannelV&gt;::value);</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span> <span class="keywordflow">return</span> DstChannelV(src * mul);</div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span> }</div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span>};</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span> </div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span><span class="comment">// Both source and destination are unsigned integral channels,</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span><span class="comment">// the dst max value is less than (or equal to) the src max value,</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span><span class="comment">// and the src max value is not divisible by the dst max value</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV, <span class="keyword">typename</span> DstChannelV, <span class="keywordtype">bool</span> CannotFit&gt;</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"> 297</span><span class="keyword">struct </span>channel_converter_unsigned_integral_nondivisible&lt;SrcChannelV,DstChannelV,false,CannotFit&gt;</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span>{</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span> <span class="keyword">auto</span> operator()(SrcChannelV src) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span> {</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span> <span class="keyword">using </span>src_integer_t = <span class="keyword">typename</span> detail::unsigned_integral_max_value&lt;SrcChannelV&gt;::value_type;</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span> <span class="keyword">using </span>dst_integer_t = <span class="keyword">typename</span> detail::unsigned_integral_max_value&lt;DstChannelV&gt;::value_type;</div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span> </div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">double</span> div = unsigned_integral_max_value&lt;SrcChannelV&gt;::value</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span> / <span class="keyword">static_cast&lt;</span> <span class="keywordtype">double</span> <span class="keyword">&gt;</span>( unsigned_integral_max_value&lt;DstChannelV&gt;::value );</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span> </div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span> <span class="keyword">static</span> <span class="keyword">const</span> src_integer_t div2 = <span class="keyword">static_cast&lt;</span> src_integer_t <span class="keyword">&gt;</span>( div / 2.0 );</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span> </div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"> 309</span> <span class="keywordflow">return</span> DstChannelV( <span class="keyword">static_cast&lt;</span> dst_integer_t <span class="keyword">&gt;</span>(( <span class="keyword">static_cast&lt;</span> <span class="keywordtype">double</span> <span class="keyword">&gt;</span>( src + div2 ) / div )));</div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno"> 310</span> }</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno"> 311</span>};</div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno"> 312</span> </div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno"> 313</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"> 314</span> </div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno"> 318</span> </div>
<div class="foldopen" id="foldopen00319" data-start="{" data-end="};">
<div class="line"><a id="l00319" name="l00319"></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"> 319</a></span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> DstChannelV&gt; <span class="keyword">struct </span>channel_converter_unsigned&lt;<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>,DstChannelV&gt; {</div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno"> 320</span> <span class="keyword">using </span>argument_type = <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"> 321</span> <span class="keyword">using </span>result_type = DstChannelV;</div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"> 322</span> <span class="keyword">auto</span> operator()(<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> x) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span> {</div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span> <span class="keyword">using </span>dst_integer_t = <span class="keyword">typename</span> detail::unsigned_integral_max_value&lt;DstChannelV&gt;::value_type;</div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"> 325</span> <span class="keywordflow">return</span> DstChannelV( <span class="keyword">static_cast&lt;</span> dst_integer_t <span class="keyword">&gt;</span>(x*channel_traits&lt;DstChannelV&gt;::max_value()+0.5f ));</div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span> }</div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span>};</div>
</div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span> </div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"> 329</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannelV&gt; <span class="keyword">struct </span>channel_converter_unsigned&lt;SrcChannelV,<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>&gt; {</div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span> <span class="keyword">using </span>argument_type = <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span> <span class="keyword">using </span>result_type = SrcChannelV;</div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span> <span class="keyword">auto</span> operator()(SrcChannelV x) <span class="keyword">const</span> -&gt; <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> { <span class="keywordflow">return</span> <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>(x/<span class="keywordtype">float</span>(channel_traits&lt;SrcChannelV&gt;::max_value())); }</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span>};</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno"> 334</span> </div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"> 335</span><span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_converter_unsigned&lt;float32_t,float32_t&gt; {</div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno"> 336</span> <span class="keyword">using </span>argument_type = float32_t;</div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno"> 337</span> <span class="keyword">using </span>result_type = float32_t;</div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"> 338</span> <span class="keyword">auto</span> operator()(float32_t x) <span class="keyword">const</span> -&gt; float32_t { <span class="keywordflow">return</span> x; }</div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span>};</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span> </div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span> </div>
<div class="foldopen" id="foldopen00343" data-start="{" data-end="};">
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01uint32__t_00_01float32__t_01_4.html"> 343</a></span><span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_converter_unsigned&lt;uint32_t,<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>&gt; {</div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span> <span class="keyword">using </span>argument_type = uint32_t;</div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno"> 345</span> <span class="keyword">using </span>result_type = <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"> 346</span> <span class="keyword">auto</span> operator()(uint32_t x) <span class="keyword">const</span> -&gt; <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"> 347</span> {</div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno"> 348</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 uint32_t matches max_value of float32_t</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno"> 349</span> <span class="keywordflow">if</span> (x&gt;=channel_traits&lt;uint32_t&gt;::max_value()) <span class="keywordflow">return</span> channel_traits&lt;float32_t&gt;::max_value();</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span> <span class="keywordflow">return</span> float(x) / float(channel_traits&lt;uint32_t&gt;::max_value());</div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno"> 351</span> }</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"> 352</span>};</div>
</div>
<div class="foldopen" id="foldopen00354" data-start="{" data-end="};">
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter__unsigned_3_01float32__t_00_01uint32__t_01_4.html"> 354</a></span><span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>channel_converter_unsigned&lt;<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>,uint32_t&gt; {</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span> <span class="keyword">using </span>argument_type = <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"> 356</span> <span class="keyword">using </span>result_type = uint32_t;</div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno"> 357</span> <span class="keyword">auto</span> operator()(<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> x) <span class="keyword">const</span> -&gt; uint32_t</div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span> {</div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</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 uint32_t matches max_value of float32_t</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span> <span class="keywordflow">if</span> (x&gt;=channel_traits&lt;float32_t&gt;::max_value())</div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span> <span class="keywordflow">return</span> channel_traits&lt;uint32_t&gt;::max_value();</div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno"> 362</span> </div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"> 363</span> <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 id="l00364" name="l00364"></a><span class="lineno"> 364</span> <span class="keyword">auto</span> <span class="keyword">const</span> result = x * <span class="keyword">static_cast&lt;</span>float32_t::base_channel_t<span class="keyword">&gt;</span>(max_value) + 0.5f;</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno"> 365</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>uint32_t<span class="keyword">&gt;</span>(result);</div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno"> 366</span> }</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span>};</div>
</div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span> </div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span> </div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span><span class="comment">// Converting from signed to unsigned integral channel.</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span><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 id="l00374" name="l00374"></a><span class="lineno"> 374</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt; <span class="comment">// Model ChannelValueConcept</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span><span class="keyword">struct </span>channel_convert_to_unsigned : <span class="keyword">public</span> <a class="code hl_struct" href="structboost_1_1gil_1_1detail_1_1identity.html">detail::identity</a>&lt;ChannelValue&gt; {</div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span> <span class="keyword">using </span>type = ChannelValue;</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno"> 377</span>};</div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno"> 378</span> </div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"> 379</span><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 id="l00380" name="l00380"></a><span class="lineno"> 380</span> <span class="keyword">using </span>argument_type = int8_t;</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span> <span class="keyword">using </span>result_type = uint8_t;</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span> <span class="keyword">using </span>type = uint8_t;</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span> type operator()(int8_t val)<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>uint8_t<span class="keyword">&gt;</span>(<span class="keyword">static_cast&lt;</span>uint32_t<span class="keyword">&gt;</span>(val) + 128u);</div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span> }</div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span>};</div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span> </div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span><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 id="l00389" name="l00389"></a><span class="lineno"> 389</span> <span class="keyword">using </span>argument_type = int16_t;</div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span> <span class="keyword">using </span>result_type = uint16_t;</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span> <span class="keyword">using </span>type = uint16_t;</div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span> type operator()(int16_t val)<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>uint16_t<span class="keyword">&gt;</span>(<span class="keyword">static_cast&lt;</span>uint32_t<span class="keyword">&gt;</span>(val) + 32768u);</div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span> }</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span>};</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"> 396</span> </div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno"> 397</span><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 id="l00398" name="l00398"></a><span class="lineno"> 398</span> <span class="keyword">using </span>argument_type = int32_t;</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno"> 399</span> <span class="keyword">using </span>result_type = uint32_t;</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno"> 400</span> <span class="keyword">using </span>type = uint32_t;</div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno"> 401</span> type operator()(int32_t val)<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno"> 402</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>uint32_t<span class="keyword">&gt;</span>(val)+(1u&lt;&lt;31);</div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno"> 403</span> }</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"> 404</span>};</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno"> 405</span> </div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno"> 406</span> </div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span><span class="comment">// Converting from unsigned to signed integral channel</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span><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 id="l00409" name="l00409"></a><span class="lineno"> 409</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt; <span class="comment">// Model ChannelValueConcept</span></div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno"> 410</span><span class="keyword">struct </span>channel_convert_from_unsigned : <span class="keyword">public</span> detail::identity&lt;ChannelValue&gt; {</div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"> 411</span> <span class="keyword">using </span>type = ChannelValue;</div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"> 412</span>};</div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"> 413</span> </div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span><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 id="l00415" name="l00415"></a><span class="lineno"> 415</span> <span class="keyword">using </span>argument_type = uint8_t;</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span> <span class="keyword">using </span>result_type = int8_t;</div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"> 417</span> <span class="keyword">using </span>type = int8_t;</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span> type operator()(uint8_t val)<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>int8_t<span class="keyword">&gt;</span>(<span class="keyword">static_cast&lt;</span>int32_t<span class="keyword">&gt;</span>(val) - 128);</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span> }</div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno"> 421</span>};</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno"> 422</span> </div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno"> 423</span><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 id="l00424" name="l00424"></a><span class="lineno"> 424</span> <span class="keyword">using </span>argument_type = uint16_t;</div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno"> 425</span> <span class="keyword">using </span>result_type = int16_t;</div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno"> 426</span> <span class="keyword">using </span>type = int16_t;</div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"> 427</span> type operator()(uint16_t val)<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno"> 428</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>int16_t<span class="keyword">&gt;</span>(<span class="keyword">static_cast&lt;</span>int32_t<span class="keyword">&gt;</span>(val) - 32768);</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno"> 429</span> }</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno"> 430</span>};</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno"> 431</span> </div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"> 432</span><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 id="l00433" name="l00433"></a><span class="lineno"> 433</span> <span class="keyword">using </span>argument_type = uint32_t;</div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno"> 434</span> <span class="keyword">using </span>result_type = int32_t;</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno"> 435</span> <span class="keyword">using </span>type = int32_t;</div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"> 436</span> type operator()(uint32_t val)<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>int32_t<span class="keyword">&gt;</span>(val - (1u&lt;&lt;31));</div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span> }</div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"> 439</span>};</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno"> 440</span> </div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno"> 441</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno"> 442</span> </div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno"> 445</span><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="foldopen" id="foldopen00446" data-start="{" data-end="};">
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__converter.html"> 446</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__converter.html">channel_converter</a> {</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno"> 447</span> <span class="keyword">using </span>argument_type = SrcChannelV;</div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"> 448</span> <span class="keyword">using </span>result_type = DstChannelV;</div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno"> 449</span> <span class="keyword">auto</span> operator()(SrcChannelV <span class="keyword">const</span>&amp; src) <span class="keyword">const</span> -&gt; DstChannelV</div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno"> 450</span> {</div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno"> 451</span> <span class="keyword">using </span>to_unsigned = detail::channel_convert_to_unsigned&lt;SrcChannelV&gt;;</div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno"> 452</span> <span class="keyword">using </span>from_unsigned = detail::channel_convert_from_unsigned&lt;DstChannelV&gt;;</div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"> 453</span> <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 id="l00454" name="l00454"></a><span class="lineno"> 454</span> <span class="keywordflow">return</span> from_unsigned()(converter_unsigned()(to_unsigned()(src)));</div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno"> 455</span> }</div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"> 456</span>};</div>
</div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno"> 457</span> </div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span><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="foldopen" id="foldopen00461" data-start="{" data-end="}">
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"><a class="line" href="group___channel_convert_algorithm.html#gaedf6a65199e8c8a58ed23f00400753bf"> 461</a></span><span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code hl_function" href="group___channel_convert_algorithm.html#gaedf6a65199e8c8a58ed23f00400753bf">channel_convert</a>(SrcChannel <span class="keyword">const</span>&amp; src) -&gt; <span class="keyword">typename</span> channel_traits&lt;DstChannel&gt;::value_type</div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"> 462</span>{</div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"> 463</span> <span class="keywordflow">return</span> <a class="code hl_struct" 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 id="l00464" name="l00464"></a><span class="lineno"> 464</span> <span class="keyword">typename</span> channel_traits&lt;DstChannel&gt;::value_type&gt;()(src);</div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"> 465</span>}</div>
</div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span> </div>
<div class="foldopen" id="foldopen00471" data-start="{" data-end="};">
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__channel__converter.html"> 471</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1default__channel__converter.html">default_channel_converter</a> {</div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span> <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Ch1, <span class="keyword">typename</span> Ch2&gt;</div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span> <span class="keywordtype">void</span> operator()(Ch1 <span class="keyword">const</span>&amp; src, Ch2&amp; dst)<span class="keyword"> const</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span> dst=channel_convert&lt;Ch2&gt;(src);</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span> }</div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span>};</div>
</div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span> </div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span><span class="keyword">namespace </span>detail</div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span>{</div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span> <span class="comment">// fast integer division by 255</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span> <span class="keyword">inline</span> <span class="keyword">auto</span> div255(uint32_t in) -&gt; uint32_t</div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span> {</div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span> uint32_t tmp = in + 128;</div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span> <span class="keywordflow">return</span> (tmp + (tmp &gt;&gt; 8)) &gt;&gt; 8;</div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span> }</div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span> </div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span> <span class="comment">// fast integer division by 32768</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span> <span class="keyword">inline</span> <span class="keyword">auto</span> div32768(uint32_t in) -&gt; uint32_t</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span> {</div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span> <span class="keywordflow">return</span> (in + 16384) &gt;&gt; 15;</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span> }</div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span>}</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span> </div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span> </div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"> 509</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt;</div>
<div class="foldopen" id="foldopen00510" data-start="{" data-end="};">
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html"> 510</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a> {</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span> <span class="keyword">using </span>first_argument_type = ChannelValue;</div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span> <span class="keyword">using </span>second_argument_type = ChannelValue;</div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span> <span class="keyword">using </span>result_type = ChannelValue;</div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span> <span class="keyword">auto</span> operator()(ChannelValue a, ChannelValue b) <span class="keyword">const</span> -&gt; ChannelValue</div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span> {</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span> <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 id="l00517" name="l00517"></a><span class="lineno"> 517</span> }</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno"> 518</span>};</div>
</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span> </div>
<div class="foldopen" id="foldopen00521" data-start="{" data-end="};">
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint8__t_01_4.html"> 521</a></span><span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a>&lt;uint8_t&gt; {</div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span> <span class="keyword">using </span>first_argument_type = uint8_t;</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span> <span class="keyword">using </span>second_argument_type = uint8_t;</div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno"> 524</span> <span class="keyword">using </span>result_type = uint8_t;</div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"> 525</span> <span class="keyword">auto</span> operator()(uint8_t a, uint8_t b) <span class="keyword">const</span> -&gt; uint8_t { <span class="keywordflow">return</span> uint8_t(detail::div255(uint32_t(a) * uint32_t(b))); }</div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno"> 526</span>};</div>
</div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno"> 527</span> </div>
<div class="foldopen" id="foldopen00529" data-start="{" data-end="};">
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint16__t_01_4.html"> 529</a></span><span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a>&lt;uint16_t&gt; {</div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno"> 530</span> <span class="keyword">using </span>first_argument_type = uint16_t;</div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno"> 531</span> <span class="keyword">using </span>second_argument_type = uint16_t;</div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno"> 532</span> <span class="keyword">using </span>result_type = uint16_t;</div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno"> 533</span> <span class="keyword">auto</span> operator()(uint16_t a, uint16_t b) <span class="keyword">const</span> -&gt; uint16_t { <span class="keywordflow">return</span> uint16_t((uint32_t(a) * uint32_t(b))/65535); }</div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno"> 534</span>};</div>
</div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno"> 535</span> </div>
<div class="foldopen" id="foldopen00537" data-start="{" data-end="};">
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01float32__t_01_4.html"> 537</a></span><span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned</a>&lt;<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>&gt; {</div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno"> 538</span> <span class="keyword">using </span>first_argument_type = <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno"> 539</span> <span class="keyword">using </span>second_argument_type = <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno"> 540</span> <span class="keyword">using </span>result_type = <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>;</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno"> 541</span> <span class="keyword">auto</span> operator()(<a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> a, <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> b) <span class="keyword">const</span> -&gt; <a class="code hl_typedef" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a> { <span class="keywordflow">return</span> a*b; }</div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno"> 542</span>};</div>
</div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno"> 543</span> </div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno"> 545</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue&gt;</div>
<div class="foldopen" id="foldopen00546" data-start="{" data-end="};">
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplier.html"> 546</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__multiplier.html">channel_multiplier</a> {</div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno"> 547</span> <span class="keyword">using </span>first_argument_type = ChannelValue;</div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"> 548</span> <span class="keyword">using </span>second_argument_type = ChannelValue;</div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno"> 549</span> <span class="keyword">using </span>result_type = ChannelValue;</div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno"> 550</span> <span class="keyword">auto</span> operator()(ChannelValue a, ChannelValue b) <span class="keyword">const</span> -&gt; ChannelValue</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno"> 551</span> {</div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno"> 552</span> <span class="keyword">using </span>to_unsigned = detail::channel_convert_to_unsigned&lt;ChannelValue&gt;;</div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno"> 553</span> <span class="keyword">using </span>from_unsigned = detail::channel_convert_from_unsigned&lt;ChannelValue&gt;;</div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno"> 554</span> <span class="keyword">using </span>multiplier_unsigned = <a class="code hl_struct" 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 id="l00555" name="l00555"></a><span class="lineno"> 555</span> <span class="keywordflow">return</span> from_unsigned()(multiplier_unsigned()(to_unsigned()(a), to_unsigned()(b)));</div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno"> 556</span> }</div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno"> 557</span>};</div>
</div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno"> 558</span> </div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno"> 560</span><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="foldopen" id="foldopen00561" data-start="{" data-end="}">
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno"><a class="line" href="group___channel_multiply_algorithm.html#ga0ba61722109fe5a1246c04558160449e"> 561</a></span><span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code hl_function" href="group___channel_multiply_algorithm.html#ga0ba61722109fe5a1246c04558160449e">channel_multiply</a>(Channel a, Channel b) -&gt; <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::value_type</div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno"> 562</span>{</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno"> 563</span> <span class="keywordflow">return</span> <a class="code hl_struct" 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 id="l00564" name="l00564"></a><span class="lineno"> 564</span>}</div>
</div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno"> 566</span> </div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno"> 578</span> </div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno"> 581</span><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="foldopen" id="foldopen00582" data-start="{" data-end="}">
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno"><a class="line" href="group___channel_invert_algorithm.html#ga32df9cb146e778d2f6c144121415751c"> 582</a></span><span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code hl_function" href="group___channel_invert_algorithm.html#ga32df9cb146e778d2f6c144121415751c">channel_invert</a>(Channel x) -&gt; <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::value_type</div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno"> 583</span>{</div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno"> 584</span> <span class="keyword">using </span>base_t = <span class="keyword">typename</span> base_channel_type&lt;Channel&gt;::type;</div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno"> 585</span> <span class="keyword">using </span>promoted_t = <span class="keyword">typename</span> promote_integral&lt;base_t&gt;::type;</div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno"> 586</span> promoted_t <span class="keyword">const</span> promoted_x = x;</div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno"> 587</span> promoted_t <span class="keyword">const</span> promoted_max = channel_traits&lt;Channel&gt;::max_value();</div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno"> 588</span> promoted_t <span class="keyword">const</span> promoted_min = channel_traits&lt;Channel&gt;::min_value();</div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno"> 589</span> promoted_t <span class="keyword">const</span> promoted_inverted_x = promoted_max - promoted_x + promoted_min;</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno"> 590</span> <span class="keyword">auto</span> <span class="keyword">const</span> inverted_x = <span class="keyword">static_cast&lt;</span>base_t<span class="keyword">&gt;</span>(promoted_inverted_x);</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno"> 591</span> <span class="keywordflow">return</span> inverted_x;</div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno"> 592</span>}</div>
</div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno"> 593</span> </div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno"> 594</span>}} <span class="comment">// namespace boost::gil</span></div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno"> 595</span> </div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno"> 596</span><span class="preprocessor">#endif</span></div>
<div class="ttc" id="agroup___channel_convert_algorithm_html_gaedf6a65199e8c8a58ed23f00400753bf"><div class="ttname"><a href="group___channel_convert_algorithm.html#gaedf6a65199e8c8a58ed23f00400753bf">boost::gil::channel_convert</a></div><div class="ttdeci">auto channel_convert(SrcChannel const &amp;src) -&gt; typename channel_traits&lt; DstChannel &gt;::value_type</div><div class="ttdoc">Converting from one channel type to another.</div><div class="ttdef"><b>Definition</b> channel_algorithm.hpp:461</div></div>
<div class="ttc" id="agroup___channel_invert_algorithm_html_ga32df9cb146e778d2f6c144121415751c"><div class="ttname"><a href="group___channel_invert_algorithm.html#ga32df9cb146e778d2f6c144121415751c">boost::gil::channel_invert</a></div><div class="ttdeci">auto channel_invert(Channel x) -&gt; typename channel_traits&lt; Channel &gt;::value_type</div><div class="ttdoc">Default implementation. Provide overloads for performance.</div><div class="ttdef"><b>Definition</b> channel_algorithm.hpp:582</div></div>
<div class="ttc" id="agroup___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:153</div></div>
<div class="ttc" id="agroup___channel_multiply_algorithm_html_ga0ba61722109fe5a1246c04558160449e"><div class="ttname"><a href="group___channel_multiply_algorithm.html#ga0ba61722109fe5a1246c04558160449e">boost::gil::channel_multiply</a></div><div class="ttdeci">auto channel_multiply(Channel a, Channel b) -&gt; typename channel_traits&lt; Channel &gt;::value_type</div><div class="ttdoc">A function multiplying two channels. result = a * b / max_value.</div><div class="ttdef"><b>Definition</b> channel_algorithm.hpp:561</div></div>
<div class="ttc" id="anamespaceboost_html"><div class="ttname"><a href="namespaceboost.html">boost</a></div><div class="ttdoc">defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)</div><div class="ttdef"><b>Definition</b> algorithm.hpp:36</div></div>
<div class="ttc" id="astructboost_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:446</div></div>
<div class="ttc" id="astructboost_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:510</div></div>
<div class="ttc" id="astructboost_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:546</div></div>
<div class="ttc" id="astructboost_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:471</div></div>
<div class="ttc" id="astructboost_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:211</div></div>
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