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  47. <div class="title">channel.hpp</div>  </div>
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  50. <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_CHANNEL_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_CHANNEL_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/utilities.hpp&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;</div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;boost/assert.hpp&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;boost/config.hpp&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;boost/config/pragma_message.hpp&gt;</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;boost/integer/integer_mask.hpp&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;cstdint&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;limits&gt;</span></div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></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="preprocessor">#ifdef BOOST_GIL_DOXYGEN_ONLY</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#define BOOST_GIL_CONFIG_HAS_UNALIGNED_ACCESS</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">#ifdef BOOST_GIL_CONFIG_HAS_UNALIGNED_ACCESS</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">#if defined(sun) || defined(__sun) || \             // SunOS</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    defined(__osf__) || defined(__osf) || \         <span class="comment">// Tru64</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    defined(_hpux) || defined(hpux) || \            <span class="comment">// HP-UX</span></div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    defined(__arm__) || defined(__ARM_ARCH) || \    <span class="comment">// ARM</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    defined(_AIX)                                   <span class="comment">// AIX</span></div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="preprocessor">#error Unaligned access strictly disabled for some UNIX platforms or ARM architecture</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="preprocessor">#elif defined(__i386__) || defined(__x86_64__) || defined(__vax__)</span></div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    <span class="comment">// The check for little-endian architectures that tolerate unaligned memory</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <span class="comment">// accesses is just an optimization. Nothing will break if it fails to detect</span></div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="comment">// a suitable architecture.</span></div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;    <span class="comment">//</span></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="comment">// Unfortunately, this optimization may be a C/C++ strict aliasing rules violation</span></div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="comment">// if accessed data buffer has effective type that cannot be aliased</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="comment">// without leading to undefined behaviour.</span></div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;BOOST_PRAGMA_MESSAGE(<span class="stringliteral">&quot;CAUTION: Unaligned access tolerated on little-endian may cause undefined behaviour&quot;</span>)</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#error Unaligned access disabled for unknown platforms and architectures</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="preprocessor">#endif // defined(BOOST_GIL_CONFIG_HAS_UNALIGNED_ACCESS)</span></div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keywordtype">bool</span> IsClass&gt;</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="keyword">struct </span>channel_traits_impl;</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">// channel traits for custom class</span></div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="keyword">struct </span>channel_traits_impl&lt;T, true&gt;</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;    <span class="keyword">using</span> value_type = <span class="keyword">typename</span> T::value_type;</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    <span class="keyword">using</span> reference = <span class="keyword">typename</span> T::reference;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="keyword">using</span> pointer = <span class="keyword">typename</span> T::pointer;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="keyword">using</span> const_reference = <span class="keyword">typename</span> T::const_reference;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <span class="keyword">using</span> const_pointer = <span class="keyword">typename</span> T::const_pointer;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> is_mutable = T::is_mutable;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <span class="keyword">static</span> value_type min_value() { <span class="keywordflow">return</span> T::min_value(); }</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    <span class="keyword">static</span> value_type max_value() { <span class="keywordflow">return</span> T::max_value(); }</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">// channel traits implementation for built-in integral or floating point channel type</span></div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="keyword">struct </span>channel_traits_impl&lt;T, false&gt;</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;{</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keyword">using</span> value_type = T;</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    <span class="keyword">using</span> reference = T&amp;;</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="keyword">using</span> pointer = T*;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    <span class="keyword">using</span> const_reference = T <span class="keyword">const</span>&amp;;</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    <span class="keyword">using</span> const_pointer = T <span class="keyword">const</span>*;</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> is_mutable = <span class="keyword">true</span>;</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    <span class="keyword">static</span> value_type min_value() { <span class="keywordflow">return</span> (std::numeric_limits&lt;T&gt;::min)(); }</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    <span class="keyword">static</span> value_type max_value() { <span class="keywordflow">return</span> (std::numeric_limits&lt;T&gt;::max)(); }</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;};</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="comment">// channel traits implementation for constant built-in scalar or floating point type</span></div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="keyword">struct </span>channel_traits_impl&lt;T const, false&gt; : channel_traits_impl&lt;T, false&gt;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;{</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="keyword">using</span> reference = T <span class="keyword">const</span>&amp;;</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keyword">using</span> pointer = T <span class="keyword">const</span>*;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> is_mutable = <span class="keyword">false</span>;</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;};</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;<span class="keyword">struct </span>channel_traits : detail::channel_traits_impl&lt;T, std::is_class&lt;T&gt;::value&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;<span class="comment">// Channel traits for C++ reference type - remove the reference</span></div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;<span class="keyword">struct </span>channel_traits&lt;T&amp;&gt; : channel_traits&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;<span class="comment">// Channel traits for constant C++ reference type</span></div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="keyword">struct </span>channel_traits&lt;T const&amp;&gt; : channel_traits&lt;T&gt;</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;{</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    <span class="keyword">using</span> reference = <span class="keyword">typename</span> channel_traits&lt;T&gt;::const_reference;</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    <span class="keyword">using</span> pointer = <span class="keyword">typename</span> channel_traits&lt;T&gt;::const_pointer;</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> is_mutable = <span class="keyword">false</span>;</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;};</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;</div><div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div><div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> BaseChannelValue, <span class="keyword">typename</span> MinVal, <span class="keyword">typename</span> MaxVal&gt;</div><div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;<span class="keyword">struct </span>scoped_channel_value</div><div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;{</div><div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;    <span class="keyword">using</span> value_type = scoped_channel_value&lt;BaseChannelValue, MinVal, MaxVal&gt;;</div><div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;    <span class="keyword">using</span> reference = value_type&amp;;</div><div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    <span class="keyword">using</span> pointer = value_type*;</div><div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;    <span class="keyword">using</span> const_reference = value_type <span class="keyword">const</span>&amp;;</div><div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    <span class="keyword">using</span> const_pointer = value_type <span class="keyword">const</span>*;</div><div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> is_mutable = channel_traits&lt;BaseChannelValue&gt;::is_mutable;</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;    <span class="keyword">using</span> base_channel_t = BaseChannelValue;</div><div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;</div><div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    <span class="keyword">static</span> value_type min_value() { <span class="keywordflow">return</span> MinVal::apply(); }</div><div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;    <span class="keyword">static</span> value_type max_value() { <span class="keywordflow">return</span> MaxVal::apply(); }</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;    scoped_channel_value() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;    scoped_channel_value(scoped_channel_value <span class="keyword">const</span>&amp; other) : value_(other.value_) {}</div><div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;    scoped_channel_value&amp; operator=(scoped_channel_value <span class="keyword">const</span>&amp; other) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    scoped_channel_value(BaseChannelValue value) : value_(value) {}</div><div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    scoped_channel_value&amp; operator=(BaseChannelValue value)</div><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;    {</div><div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;        value_ = value;</div><div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;        <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;    }</div><div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;</div><div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    scoped_channel_value&amp; operator++() { ++value_; <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;    scoped_channel_value&amp; operator--() { --value_; <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;</div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;    scoped_channel_value operator++(<span class="keywordtype">int</span>) { scoped_channel_value tmp=*<span class="keyword">this</span>; this-&gt;operator++(); <span class="keywordflow">return</span> tmp; }</div><div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;    scoped_channel_value operator--(<span class="keywordtype">int</span>) { scoped_channel_value tmp=*<span class="keyword">this</span>; this-&gt;operator--(); <span class="keywordflow">return</span> tmp; }</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;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Scalar2&gt; scoped_channel_value&amp; operator+=(Scalar2 v) { value_+=v; <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Scalar2&gt; scoped_channel_value&amp; operator-=(Scalar2 v) { value_-=v; <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Scalar2&gt; scoped_channel_value&amp; operator*=(Scalar2 v) { value_*=v; <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Scalar2&gt; scoped_channel_value&amp; operator/=(Scalar2 v) { value_/=v; <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;</div><div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;    <span class="keyword">operator</span> BaseChannelValue()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> value_; }</div><div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;    BaseChannelValue value_{};</div><div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;};</div><div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;</div><div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;<span class="keyword">struct </span>float_point_zero</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;    <span class="keyword">static</span> constexpr T apply() { <span class="keywordflow">return</span> 0.0f; }</div><div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;};</div><div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;</div><div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;<span class="keyword">struct </span>float_point_one</div><div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;{</div><div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;    <span class="keyword">static</span> constexpr T apply() { <span class="keywordflow">return</span> 1.0f; }</div><div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;};</div><div class="line"><a name="l00228"></a><span class="lineno">  228</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">// It is necessary for packed channels to have their own value type. They cannot simply use an integral large enough to store the data. Here is why:</span></div><div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;<span class="comment">// - Any operation that requires returning the result by value will otherwise return the built-in integral type, which will have incorrect range</span></div><div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;<span class="comment">//   That means that after getting the value of the channel we cannot properly do channel_convert, channel_invert, etc.</span></div><div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;<span class="comment">// - Two channels are declared compatible if they have the same value type. That means that a packed channel is incorrectly declared compatible with an integral type</span></div><div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;</div><div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;<span class="comment">// returns the smallest fast unsigned integral type that has at least NumBits bits</span></div><div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;<span class="keyword">template</span> &lt;<span class="keywordtype">int</span> NumBits&gt;</div><div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;<span class="keyword">struct </span>min_fast_uint :</div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;    std::conditional</div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    &lt;</div><div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;        NumBits &lt;= 8,</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;        std::uint_least8_t,</div><div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;        typename std::conditional</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;            NumBits &lt;= 16,</div><div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;            std::uint_least16_t,</div><div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;            typename std::conditional</div><div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;            &lt;</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;                NumBits &lt;= 32,</div><div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;                std::uint_least32_t,</div><div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;                std::uintmax_t</div><div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;            &gt;::type</div><div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;        &gt;::type</div><div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    &gt;</div><div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;{};</div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;</div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;template &lt;int NumBits&gt;</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;struct num_value_fn</div><div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    : std::conditional&lt;NumBits &lt; 32, std::uint32_t, std::uint64_t&gt;</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;</div><div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;template &lt;int NumBits&gt;</div><div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;struct max_value_fn</div><div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;    : std::conditional&lt;NumBits &lt;= 32, std::uint32_t, std::uint64_t&gt;</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;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;</div><div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;</div><div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;template &lt;int NumBits&gt;</div><div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;class packed_channel_value</div><div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;{</div><div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;public:</div><div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;    using integer_t = typename detail::min_fast_uint&lt;NumBits&gt;::type;</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 value_type = packed_channel_value&lt;NumBits&gt;;</div><div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;    using reference = value_type&amp;;</div><div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;    using const_reference = value_type const&amp;;</div><div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;    using pointer = value_type*;</div><div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;    using const_pointer = value_type const*;</div><div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;    static constexpr bool is_mutable = true;</div><div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;</div><div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;    static value_type min_value() { return 0; }</div><div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;    static value_type max_value() { return low_bits_mask_t&lt; NumBits &gt;::sig_bits; }</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;    packed_channel_value() = default;</div><div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;    packed_channel_value(integer_t v)</div><div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;    {</div><div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;        value_ = static_cast&lt;integer_t&gt;(v &amp; low_bits_mask_t&lt;NumBits&gt;::sig_bits_fast);</div><div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;    }</div><div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160;</div><div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;    template &lt;typename Scalar&gt;</div><div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;    packed_channel_value(Scalar v)</div><div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;    {</div><div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;        value_ = packed_channel_value(static_cast&lt;integer_t&gt;(v));</div><div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;    }</div><div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;</div><div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;    static unsigned int num_bits() { return NumBits; }</div><div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;</div><div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;    operator integer_t() const { return value_; }</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;private:</div><div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;    integer_t value_{};</div><div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;};</div><div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;</div><div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;namespace detail {</div><div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;</div><div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;template &lt;std::size_t K&gt;</div><div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;struct static_copy_bytes</div><div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;{</div><div class="line"><a name="l00329"></a><span class="lineno">  329</span>&#160;    void operator()(unsigned char const* from, unsigned char* to) const</div><div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;    {</div><div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;        *to = *from;</div><div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;        static_copy_bytes&lt;K - 1&gt;()(++from, ++to);</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="l00335"></a><span class="lineno">  335</span>&#160;</div><div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;template &lt;&gt;</div><div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;struct static_copy_bytes&lt;0&gt;</div><div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;{</div><div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;    void operator()(unsigned char const*, unsigned char*) const {}</div><div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;};</div><div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;</div><div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;template &lt;typename Derived, typename BitField, int NumBits, bool IsMutable&gt;</div><div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;class packed_channel_reference_base</div><div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;{</div><div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;protected:</div><div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;    using data_ptr_t = typename std::conditional&lt;IsMutable, void*, void const*&gt;::type;</div><div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;public:</div><div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;    data_ptr_t _data_ptr;   <span class="comment">// void* pointer to the first byte of the bit range</span></div><div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;</div><div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;    using value_type = packed_channel_value&lt;NumBits&gt;;</div><div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;    using reference = const Derived;</div><div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;    using pointer = value_type *;</div><div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;    using const_pointer = const value_type *;</div><div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;    static constexpr int num_bits = NumBits;</div><div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;    static constexpr bool is_mutable = IsMutable;</div><div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;</div><div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;    static value_type min_value()       { return channel_traits&lt;value_type&gt;::min_value(); }</div><div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;    static value_type max_value()       { return channel_traits&lt;value_type&gt;::max_value(); }</div><div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;</div><div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;    using bitfield_t = BitField;</div><div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;    using integer_t = typename value_type::integer_t;</div><div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160;</div><div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;    packed_channel_reference_base(data_ptr_t data_ptr) : _data_ptr(data_ptr) {}</div><div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;    packed_channel_reference_base(const packed_channel_reference_base&amp; ref) : _data_ptr(ref._data_ptr) {}</div><div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;    const Derived&amp; operator=(integer_t v) const { set(v); return derived(); }</div><div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;</div><div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;    const Derived&amp; operator++() const { set(get()+1); return derived(); }</div><div class="line"><a name="l00368"></a><span class="lineno">  368</span>&#160;    const Derived&amp; operator--() const { set(get()-1); return derived(); }</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;    Derived operator++(int) const { Derived tmp=derived(); this-&gt;operator++(); return tmp; }</div><div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;    Derived operator--(int) const { Derived tmp=derived(); this-&gt;operator--(); return tmp; }</div><div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;</div><div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160;    template &lt;typename Scalar2&gt; const Derived&amp; operator+=(Scalar2 v) const { set( static_cast&lt;integer_t&gt;(  get() + v )); return derived(); }</div><div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;    template &lt;typename Scalar2&gt; const Derived&amp; operator-=(Scalar2 v) const { set( static_cast&lt;integer_t&gt;(  get() - v )); return derived(); }</div><div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;    template &lt;typename Scalar2&gt; const Derived&amp; operator*=(Scalar2 v) const { set( static_cast&lt;integer_t&gt;(  get() * v )); return derived(); }</div><div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;    template &lt;typename Scalar2&gt; const Derived&amp; operator/=(Scalar2 v) const { set( static_cast&lt;integer_t&gt;(  get() / v )); return derived(); }</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;    operator integer_t() const { return get(); }</div><div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;    data_ptr_t operator &amp;() const {return _data_ptr;}</div><div class="line"><a name="l00380"></a><span class="lineno">  380</span>&#160;protected:</div><div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160;</div><div class="line"><a name="l00382"></a><span class="lineno">  382</span>&#160;    using num_value_t = typename detail::num_value_fn&lt;NumBits&gt;::type;</div><div class="line"><a name="l00383"></a><span class="lineno">  383</span>&#160;    using max_value_t = typename detail::max_value_fn&lt;NumBits&gt;::type;</div><div class="line"><a name="l00384"></a><span class="lineno">  384</span>&#160;</div><div class="line"><a name="l00385"></a><span class="lineno">  385</span>&#160;    static const num_value_t num_values = static_cast&lt; num_value_t &gt;( 1 ) &lt;&lt; NumBits ;</div><div class="line"><a name="l00386"></a><span class="lineno">  386</span>&#160;    static const max_value_t max_val    = static_cast&lt; max_value_t &gt;( num_values - 1 );</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;#if defined(BOOST_GIL_CONFIG_HAS_UNALIGNED_ACCESS)</div><div class="line"><a name="l00389"></a><span class="lineno">  389</span>&#160;    const bitfield_t&amp; get_data()                      const { return *static_cast&lt;const bitfield_t*&gt;(_data_ptr); }</div><div class="line"><a name="l00390"></a><span class="lineno">  390</span>&#160;    void              set_data(const bitfield_t&amp; val) const {        *static_cast&lt;      bitfield_t*&gt;(_data_ptr) = val; }</div><div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;#else</div><div class="line"><a name="l00392"></a><span class="lineno">  392</span>&#160;    bitfield_t get_data() const {</div><div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;        bitfield_t ret;</div><div class="line"><a name="l00394"></a><span class="lineno">  394</span>&#160;        static_copy_bytes&lt;sizeof(bitfield_t) &gt;()(gil_reinterpret_cast_c&lt;const unsigned char*&gt;(_data_ptr),gil_reinterpret_cast&lt;unsigned char*&gt;(&amp;ret));</div><div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;        return ret;</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;    void set_data(const bitfield_t&amp; val) const {</div><div class="line"><a name="l00398"></a><span class="lineno">  398</span>&#160;        static_copy_bytes&lt;sizeof(bitfield_t) &gt;()(gil_reinterpret_cast_c&lt;const unsigned char*&gt;(&amp;val),gil_reinterpret_cast&lt;unsigned char*&gt;(_data_ptr));</div><div class="line"><a name="l00399"></a><span class="lineno">  399</span>&#160;    }</div><div class="line"><a name="l00400"></a><span class="lineno">  400</span>&#160;#endif</div><div class="line"><a name="l00401"></a><span class="lineno">  401</span>&#160;</div><div class="line"><a name="l00402"></a><span class="lineno">  402</span>&#160;private:</div><div class="line"><a name="l00403"></a><span class="lineno">  403</span>&#160;    void set(integer_t value) const {     <span class="comment">// can this be done faster??</span></div><div class="line"><a name="l00404"></a><span class="lineno">  404</span>&#160;        this-&gt;derived().set_unsafe(((value % num_values) + num_values) % num_values);</div><div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;    }</div><div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;    integer_t get() const { return derived().get(); }</div><div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;    const Derived&amp; derived() const { return static_cast&lt;const Derived&amp;&gt;(*this); }</div><div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;};</div><div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;}   <span class="comment">// namespace detail</span></div><div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;</div><div class="line"><a name="l00424"></a><span class="lineno">  424</span>&#160;</div><div class="line"><a name="l00428"></a><span class="lineno">  428</span>&#160;template &lt;typename BitField, int FirstBit, int NumBits, bool IsMutable&gt;</div><div class="line"><a name="l00429"></a><span class="lineno">  429</span>&#160;class packed_channel_reference;</div><div class="line"><a name="l00430"></a><span class="lineno">  430</span>&#160;</div><div class="line"><a name="l00434"></a><span class="lineno">  434</span>&#160;template &lt;typename BitField, int NumBits, bool IsMutable&gt;</div><div class="line"><a name="l00435"></a><span class="lineno">  435</span>&#160;class packed_dynamic_channel_reference;</div><div class="line"><a name="l00436"></a><span class="lineno">  436</span>&#160;</div><div class="line"><a name="l00439"></a><span class="lineno">  439</span>&#160;template &lt;typename BitField, int FirstBit, int NumBits&gt;</div><div class="line"><a name="l00440"></a><span class="lineno">  440</span>&#160;class packed_channel_reference&lt;BitField, FirstBit, NumBits, false&gt;</div><div class="line"><a name="l00441"></a><span class="lineno">  441</span>&#160;    : public detail::packed_channel_reference_base</div><div class="line"><a name="l00442"></a><span class="lineno">  442</span>&#160;        &lt;</div><div class="line"><a name="l00443"></a><span class="lineno">  443</span>&#160;            packed_channel_reference&lt;BitField, FirstBit, NumBits, false&gt;,</div><div class="line"><a name="l00444"></a><span class="lineno">  444</span>&#160;            BitField,</div><div class="line"><a name="l00445"></a><span class="lineno">  445</span>&#160;            NumBits,</div><div class="line"><a name="l00446"></a><span class="lineno">  446</span>&#160;            false</div><div class="line"><a name="l00447"></a><span class="lineno">  447</span>&#160;        &gt;</div><div class="line"><a name="l00448"></a><span class="lineno">  448</span>&#160;{</div><div class="line"><a name="l00449"></a><span class="lineno">  449</span>&#160;    using parent_t = detail::packed_channel_reference_base</div><div class="line"><a name="l00450"></a><span class="lineno">  450</span>&#160;        &lt;</div><div class="line"><a name="l00451"></a><span class="lineno">  451</span>&#160;            packed_channel_reference&lt;BitField, FirstBit, NumBits, false&gt;,</div><div class="line"><a name="l00452"></a><span class="lineno">  452</span>&#160;            BitField,</div><div class="line"><a name="l00453"></a><span class="lineno">  453</span>&#160;            NumBits,</div><div class="line"><a name="l00454"></a><span class="lineno">  454</span>&#160;            false</div><div class="line"><a name="l00455"></a><span class="lineno">  455</span>&#160;        &gt;;</div><div class="line"><a name="l00456"></a><span class="lineno">  456</span>&#160;</div><div class="line"><a name="l00457"></a><span class="lineno">  457</span>&#160;    friend class packed_channel_reference&lt;BitField, FirstBit, NumBits, true&gt;;</div><div class="line"><a name="l00458"></a><span class="lineno">  458</span>&#160;</div><div class="line"><a name="l00459"></a><span class="lineno">  459</span>&#160;    static const BitField channel_mask = static_cast&lt;BitField&gt;(parent_t::max_val) &lt;&lt; FirstBit;</div><div class="line"><a name="l00460"></a><span class="lineno">  460</span>&#160;</div><div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;    void operator=(packed_channel_reference const&amp;);</div><div class="line"><a name="l00462"></a><span class="lineno">  462</span>&#160;public:</div><div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160;    using const_reference = packed_channel_reference&lt;BitField,FirstBit,NumBits,false&gt; const;</div><div class="line"><a name="l00464"></a><span class="lineno">  464</span>&#160;    using mutable_reference = packed_channel_reference&lt;BitField,FirstBit,NumBits,true&gt; const;</div><div class="line"><a name="l00465"></a><span class="lineno">  465</span>&#160;    using integer_t = typename parent_t::integer_t;</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;    explicit packed_channel_reference(const void* data_ptr) : parent_t(data_ptr) {}</div><div class="line"><a name="l00468"></a><span class="lineno">  468</span>&#160;    packed_channel_reference(const packed_channel_reference&amp; ref) : parent_t(ref._data_ptr) {}</div><div class="line"><a name="l00469"></a><span class="lineno">  469</span>&#160;    packed_channel_reference(const mutable_reference&amp; ref) : parent_t(ref._data_ptr) {}</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;    unsigned first_bit() const { return FirstBit; }</div><div class="line"><a name="l00472"></a><span class="lineno">  472</span>&#160;</div><div class="line"><a name="l00473"></a><span class="lineno">  473</span>&#160;    integer_t get() const { return integer_t((this-&gt;get_data()&amp;channel_mask) &gt;&gt; FirstBit); }</div><div class="line"><a name="l00474"></a><span class="lineno">  474</span>&#160;};</div><div class="line"><a name="l00475"></a><span class="lineno">  475</span>&#160;</div><div class="line"><a name="l00478"></a><span class="lineno">  478</span>&#160;template &lt;typename BitField, int FirstBit, int NumBits&gt;</div><div class="line"><a name="l00479"></a><span class="lineno">  479</span>&#160;class packed_channel_reference&lt;BitField,FirstBit,NumBits,true&gt;</div><div class="line"><a name="l00480"></a><span class="lineno">  480</span>&#160;   : public detail::packed_channel_reference_base&lt;packed_channel_reference&lt;BitField,FirstBit,NumBits,true&gt;,BitField,NumBits,true&gt;</div><div class="line"><a name="l00481"></a><span class="lineno">  481</span>&#160;{</div><div class="line"><a name="l00482"></a><span class="lineno">  482</span>&#160;    using parent_t = detail::packed_channel_reference_base&lt;packed_channel_reference&lt;BitField,FirstBit,NumBits,true&gt;,BitField,NumBits,true&gt;;</div><div class="line"><a name="l00483"></a><span class="lineno">  483</span>&#160;    friend class packed_channel_reference&lt;BitField,FirstBit,NumBits,false&gt;;</div><div class="line"><a name="l00484"></a><span class="lineno">  484</span>&#160;</div><div class="line"><a name="l00485"></a><span class="lineno">  485</span>&#160;    static const BitField channel_mask = static_cast&lt; BitField &gt;( parent_t::max_val ) &lt;&lt; FirstBit;</div><div class="line"><a name="l00486"></a><span class="lineno">  486</span>&#160;</div><div class="line"><a name="l00487"></a><span class="lineno">  487</span>&#160;public:</div><div class="line"><a name="l00488"></a><span class="lineno">  488</span>&#160;    using const_reference = packed_channel_reference&lt;BitField,FirstBit,NumBits,false&gt; const;</div><div class="line"><a name="l00489"></a><span class="lineno">  489</span>&#160;    using mutable_reference = packed_channel_reference&lt;BitField,FirstBit,NumBits,true&gt; const;</div><div class="line"><a name="l00490"></a><span class="lineno">  490</span>&#160;    using integer_t = typename parent_t::integer_t;</div><div class="line"><a name="l00491"></a><span class="lineno">  491</span>&#160;</div><div class="line"><a name="l00492"></a><span class="lineno">  492</span>&#160;    explicit packed_channel_reference(void* data_ptr) : parent_t(data_ptr) {}</div><div class="line"><a name="l00493"></a><span class="lineno">  493</span>&#160;    packed_channel_reference(const packed_channel_reference&amp; ref) : parent_t(ref._data_ptr) {}</div><div class="line"><a name="l00494"></a><span class="lineno">  494</span>&#160;</div><div class="line"><a name="l00495"></a><span class="lineno">  495</span>&#160;    packed_channel_reference const&amp; operator=(integer_t value) const</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;        BOOST_ASSERT(value &lt;= parent_t::max_val);</div><div class="line"><a name="l00498"></a><span class="lineno">  498</span>&#160;        set_unsafe(value);</div><div class="line"><a name="l00499"></a><span class="lineno">  499</span>&#160;        return *this;</div><div class="line"><a name="l00500"></a><span class="lineno">  500</span>&#160;    }</div><div class="line"><a name="l00501"></a><span class="lineno">  501</span>&#160;</div><div class="line"><a name="l00502"></a><span class="lineno">  502</span>&#160;    const packed_channel_reference&amp; operator=(const mutable_reference&amp; ref) const { set_from_reference(ref.get_data()); return *this; }</div><div class="line"><a name="l00503"></a><span class="lineno">  503</span>&#160;    const packed_channel_reference&amp; operator=(const const_reference&amp;   ref) const { set_from_reference(ref.get_data()); return *this; }</div><div class="line"><a name="l00504"></a><span class="lineno">  504</span>&#160;</div><div class="line"><a name="l00505"></a><span class="lineno">  505</span>&#160;    template &lt;bool Mutable1&gt;</div><div class="line"><a name="l00506"></a><span class="lineno">  506</span>&#160;    const packed_channel_reference&amp; operator=(const packed_dynamic_channel_reference&lt;BitField,NumBits,Mutable1&gt;&amp; ref) const { set_unsafe(ref.get()); return *this; }</div><div class="line"><a name="l00507"></a><span class="lineno">  507</span>&#160;</div><div class="line"><a name="l00508"></a><span class="lineno">  508</span>&#160;    unsigned first_bit() const { return FirstBit; }</div><div class="line"><a name="l00509"></a><span class="lineno">  509</span>&#160;</div><div class="line"><a name="l00510"></a><span class="lineno">  510</span>&#160;    integer_t get()                  const { return integer_t((this-&gt;get_data()&amp;channel_mask) &gt;&gt; FirstBit); }</div><div class="line"><a name="l00511"></a><span class="lineno">  511</span>&#160;    void set_unsafe(integer_t value) const { this-&gt;set_data((this-&gt;get_data() &amp; ~channel_mask) | (( static_cast&lt; BitField &gt;( value )&lt;&lt;FirstBit))); }</div><div class="line"><a name="l00512"></a><span class="lineno">  512</span>&#160;private:</div><div class="line"><a name="l00513"></a><span class="lineno">  513</span>&#160;    void set_from_reference(const BitField&amp; other_bits) const { this-&gt;set_data((this-&gt;get_data() &amp; ~channel_mask) | (other_bits &amp; channel_mask)); }</div><div class="line"><a name="l00514"></a><span class="lineno">  514</span>&#160;};</div><div class="line"><a name="l00515"></a><span class="lineno">  515</span>&#160;</div><div class="line"><a name="l00516"></a><span class="lineno">  516</span>&#160;}}  <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00517"></a><span class="lineno">  517</span>&#160;</div><div class="line"><a name="l00518"></a><span class="lineno">  518</span>&#160;namespace std {</div><div class="line"><a name="l00519"></a><span class="lineno">  519</span>&#160;<span class="comment">// We are forced to define swap inside std namespace because on some platforms (Visual Studio 8) STL calls swap qualified.</span></div><div class="line"><a name="l00520"></a><span class="lineno">  520</span>&#160;<span class="comment">// swap with &#39;left bias&#39;:</span></div><div class="line"><a name="l00521"></a><span class="lineno">  521</span>&#160;<span class="comment">// - swap between proxy and anything</span></div><div class="line"><a name="l00522"></a><span class="lineno">  522</span>&#160;<span class="comment">// - swap between value type and proxy</span></div><div class="line"><a name="l00523"></a><span class="lineno">  523</span>&#160;<span class="comment">// - swap between proxy and proxy</span></div><div class="line"><a name="l00524"></a><span class="lineno">  524</span>&#160;</div><div class="line"><a name="l00527"></a><span class="lineno">  527</span>&#160;template &lt;typename BF, int FB, int NB, bool M, typename R&gt;</div><div class="line"><a name="l00528"></a><span class="lineno">  528</span>&#160;inline</div><div class="line"><a name="l00529"></a><span class="lineno"><a class="line" href="group___packed_channel_reference_model.html#ga70de3c85964650c16afcc42c02bd5df9">  529</a></span>&#160;void swap(boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt; const x, R&amp; y)</div><div class="line"><a name="l00530"></a><span class="lineno">  530</span>&#160;{</div><div class="line"><a name="l00531"></a><span class="lineno">  531</span>&#160;    boost::gil::swap_proxy</div><div class="line"><a name="l00532"></a><span class="lineno">  532</span>&#160;    &lt;</div><div class="line"><a name="l00533"></a><span class="lineno">  533</span>&#160;        typename boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt;::value_type</div><div class="line"><a name="l00534"></a><span class="lineno">  534</span>&#160;    &gt;(x, y);</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="l00537"></a><span class="lineno">  537</span>&#160;</div><div class="line"><a name="l00540"></a><span class="lineno">  540</span>&#160;template &lt;typename BF, int FB, int NB, bool M&gt;</div><div class="line"><a name="l00541"></a><span class="lineno">  541</span>&#160;inline</div><div class="line"><a name="l00542"></a><span class="lineno"><a class="line" href="group___packed_channel_reference_model.html#gaca47621e82bdf4e03cf6fee2e468a840">  542</a></span>&#160;void swap(</div><div class="line"><a name="l00543"></a><span class="lineno">  543</span>&#160;    typename boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt;::value_type&amp; x,</div><div class="line"><a name="l00544"></a><span class="lineno">  544</span>&#160;    boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt; const y)</div><div class="line"><a name="l00545"></a><span class="lineno">  545</span>&#160;{</div><div class="line"><a name="l00546"></a><span class="lineno">  546</span>&#160;    boost::gil::swap_proxy</div><div class="line"><a name="l00547"></a><span class="lineno">  547</span>&#160;    &lt;</div><div class="line"><a name="l00548"></a><span class="lineno">  548</span>&#160;        typename boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt;::value_type</div><div class="line"><a name="l00549"></a><span class="lineno">  549</span>&#160;    &gt;(x,y);</div><div class="line"><a name="l00550"></a><span class="lineno">  550</span>&#160;}</div><div class="line"><a name="l00551"></a><span class="lineno">  551</span>&#160;</div><div class="line"><a name="l00554"></a><span class="lineno">  554</span>&#160;template &lt;typename BF, int FB, int NB, bool M&gt; inline</div><div class="line"><a name="l00555"></a><span class="lineno"><a class="line" href="group___packed_channel_reference_model.html#ga9f03e6f5254fdfc3848a9a9c1bba13cb">  555</a></span>&#160;void swap(</div><div class="line"><a name="l00556"></a><span class="lineno">  556</span>&#160;    boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt; const x,</div><div class="line"><a name="l00557"></a><span class="lineno">  557</span>&#160;    boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt; const y)</div><div class="line"><a name="l00558"></a><span class="lineno">  558</span>&#160;{</div><div class="line"><a name="l00559"></a><span class="lineno">  559</span>&#160;    boost::gil::swap_proxy</div><div class="line"><a name="l00560"></a><span class="lineno">  560</span>&#160;    &lt;</div><div class="line"><a name="l00561"></a><span class="lineno">  561</span>&#160;        typename boost::gil::packed_channel_reference&lt;BF, FB, NB, M&gt;::value_type</div><div class="line"><a name="l00562"></a><span class="lineno">  562</span>&#160;    &gt;(x,y);</div><div class="line"><a name="l00563"></a><span class="lineno">  563</span>&#160;}</div><div class="line"><a name="l00564"></a><span class="lineno">  564</span>&#160;</div><div class="line"><a name="l00565"></a><span class="lineno">  565</span>&#160;}   <span class="comment">// namespace std</span></div><div class="line"><a name="l00566"></a><span class="lineno">  566</span>&#160;</div><div class="line"><a name="l00567"></a><span class="lineno">  567</span>&#160;namespace boost { namespace gil {</div><div class="line"><a name="l00568"></a><span class="lineno">  568</span>&#160;</div><div class="line"><a name="l00583"></a><span class="lineno">  583</span>&#160;</div><div class="line"><a name="l00587"></a><span class="lineno">  587</span>&#160;template &lt;typename BitField, int NumBits&gt;</div><div class="line"><a name="l00588"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01false_01_4.html">  588</a></span>&#160;class packed_dynamic_channel_reference&lt;BitField,NumBits,false&gt;</div><div class="line"><a name="l00589"></a><span class="lineno">  589</span>&#160;   : public detail::packed_channel_reference_base&lt;packed_dynamic_channel_reference&lt;BitField,NumBits,false&gt;,BitField,NumBits,false&gt;</div><div class="line"><a name="l00590"></a><span class="lineno">  590</span>&#160;{</div><div class="line"><a name="l00591"></a><span class="lineno">  591</span>&#160;    using parent_t = detail::packed_channel_reference_base&lt;packed_dynamic_channel_reference&lt;BitField,NumBits,false&gt;,BitField,NumBits,false&gt;;</div><div class="line"><a name="l00592"></a><span class="lineno">  592</span>&#160;    friend class packed_dynamic_channel_reference&lt;BitField,NumBits,true&gt;;</div><div class="line"><a name="l00593"></a><span class="lineno">  593</span>&#160;</div><div class="line"><a name="l00594"></a><span class="lineno">  594</span>&#160;    unsigned _first_bit;     <span class="comment">// 0..7</span></div><div class="line"><a name="l00595"></a><span class="lineno">  595</span>&#160;</div><div class="line"><a name="l00596"></a><span class="lineno">  596</span>&#160;    void operator=(const packed_dynamic_channel_reference&amp;);</div><div class="line"><a name="l00597"></a><span class="lineno">  597</span>&#160;public:</div><div class="line"><a name="l00598"></a><span class="lineno">  598</span>&#160;    using const_reference = packed_dynamic_channel_reference&lt;BitField,NumBits,false&gt; const;</div><div class="line"><a name="l00599"></a><span class="lineno">  599</span>&#160;    using mutable_reference = packed_dynamic_channel_reference&lt;BitField,NumBits,true&gt; const;</div><div class="line"><a name="l00600"></a><span class="lineno">  600</span>&#160;    using integer_t = typename parent_t::integer_t;</div><div class="line"><a name="l00601"></a><span class="lineno">  601</span>&#160;</div><div class="line"><a name="l00602"></a><span class="lineno">  602</span>&#160;    packed_dynamic_channel_reference(const void* data_ptr, unsigned first_bit) : parent_t(data_ptr), _first_bit(first_bit) {}</div><div class="line"><a name="l00603"></a><span class="lineno">  603</span>&#160;    packed_dynamic_channel_reference(const const_reference&amp;   ref) : parent_t(ref._data_ptr), _first_bit(ref._first_bit) {}</div><div class="line"><a name="l00604"></a><span class="lineno">  604</span>&#160;    packed_dynamic_channel_reference(const mutable_reference&amp; ref) : parent_t(ref._data_ptr), _first_bit(ref._first_bit) {}</div><div class="line"><a name="l00605"></a><span class="lineno">  605</span>&#160;</div><div class="line"><a name="l00606"></a><span class="lineno">  606</span>&#160;    unsigned first_bit() const { return _first_bit; }</div><div class="line"><a name="l00607"></a><span class="lineno">  607</span>&#160;</div><div class="line"><a name="l00608"></a><span class="lineno">  608</span>&#160;    integer_t get() const {</div><div class="line"><a name="l00609"></a><span class="lineno">  609</span>&#160;        const BitField channel_mask = static_cast&lt; integer_t &gt;( parent_t::max_val ) &lt;&lt;_first_bit;</div><div class="line"><a name="l00610"></a><span class="lineno">  610</span>&#160;        return static_cast&lt; integer_t &gt;(( this-&gt;get_data()&amp;channel_mask ) &gt;&gt; _first_bit );</div><div class="line"><a name="l00611"></a><span class="lineno">  611</span>&#160;    }</div><div class="line"><a name="l00612"></a><span class="lineno">  612</span>&#160;};</div><div class="line"><a name="l00613"></a><span class="lineno">  613</span>&#160;</div><div class="line"><a name="l00617"></a><span class="lineno">  617</span>&#160;template &lt;typename BitField, int NumBits&gt;</div><div class="line"><a name="l00618"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01true_01_4.html">  618</a></span>&#160;class packed_dynamic_channel_reference&lt;BitField,NumBits,true&gt;</div><div class="line"><a name="l00619"></a><span class="lineno">  619</span>&#160;   : <span class="keyword">public</span> detail::packed_channel_reference_base&lt;packed_dynamic_channel_reference&lt;BitField,NumBits,true&gt;,BitField,NumBits,true&gt;</div><div class="line"><a name="l00620"></a><span class="lineno">  620</span>&#160;{</div><div class="line"><a name="l00621"></a><span class="lineno">  621</span>&#160;    <span class="keyword">using</span> parent_t = detail::packed_channel_reference_base&lt;packed_dynamic_channel_reference&lt;BitField,NumBits,true&gt;,BitField,NumBits,<span class="keyword">true</span>&gt;;</div><div class="line"><a name="l00622"></a><span class="lineno">  622</span>&#160;    <span class="keyword">friend</span> <span class="keyword">class </span>packed_dynamic_channel_reference&lt;BitField,NumBits,false&gt;;</div><div class="line"><a name="l00623"></a><span class="lineno">  623</span>&#160;</div><div class="line"><a name="l00624"></a><span class="lineno">  624</span>&#160;    <span class="keywordtype">unsigned</span> _first_bit;</div><div class="line"><a name="l00625"></a><span class="lineno">  625</span>&#160;</div><div class="line"><a name="l00626"></a><span class="lineno">  626</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00627"></a><span class="lineno">  627</span>&#160;    <span class="keyword">using</span> const_reference = <a class="code" href="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01false_01_4.html">packed_dynamic_channel_reference&lt;BitField,NumBits,false&gt;</a> <span class="keyword">const</span>;</div><div class="line"><a name="l00628"></a><span class="lineno">  628</span>&#160;    <span class="keyword">using</span> mutable_reference = <a class="code" href="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01true_01_4.html">packed_dynamic_channel_reference&lt;BitField,NumBits,true&gt;</a> <span class="keyword">const</span>;</div><div class="line"><a name="l00629"></a><span class="lineno">  629</span>&#160;    <span class="keyword">using</span> integer_t = <span class="keyword">typename</span> parent_t::integer_t;</div><div class="line"><a name="l00630"></a><span class="lineno">  630</span>&#160;</div><div class="line"><a name="l00631"></a><span class="lineno">  631</span>&#160;    packed_dynamic_channel_reference(<span class="keywordtype">void</span>* data_ptr, <span class="keywordtype">unsigned</span> first_bit) : parent_t(data_ptr), _first_bit(first_bit) {}</div><div class="line"><a name="l00632"></a><span class="lineno">  632</span>&#160;    packed_dynamic_channel_reference(<span class="keyword">const</span> packed_dynamic_channel_reference&amp; ref) : parent_t(ref._data_ptr), _first_bit(ref._first_bit) {}</div><div class="line"><a name="l00633"></a><span class="lineno">  633</span>&#160;</div><div class="line"><a name="l00634"></a><span class="lineno">  634</span>&#160;    packed_dynamic_channel_reference <span class="keyword">const</span>&amp; operator=(integer_t value)<span class="keyword"> const</span></div><div class="line"><a name="l00635"></a><span class="lineno">  635</span>&#160;<span class="keyword">    </span>{</div><div class="line"><a name="l00636"></a><span class="lineno">  636</span>&#160;        BOOST_ASSERT(value &lt;= parent_t::max_val);</div><div class="line"><a name="l00637"></a><span class="lineno">  637</span>&#160;        set_unsafe(value);</div><div class="line"><a name="l00638"></a><span class="lineno">  638</span>&#160;        <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00639"></a><span class="lineno">  639</span>&#160;    }</div><div class="line"><a name="l00640"></a><span class="lineno">  640</span>&#160;</div><div class="line"><a name="l00641"></a><span class="lineno">  641</span>&#160;    <span class="keyword">const</span> packed_dynamic_channel_reference&amp; operator=(<span class="keyword">const</span> mutable_reference&amp; ref)<span class="keyword"> const </span>{  set_unsafe(ref.get()); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00642"></a><span class="lineno">  642</span>&#160;    <span class="keyword">const</span> packed_dynamic_channel_reference&amp; operator=(<span class="keyword">const</span> const_reference&amp;   ref)<span class="keyword"> const </span>{  set_unsafe(ref.get()); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00643"></a><span class="lineno">  643</span>&#160;</div><div class="line"><a name="l00644"></a><span class="lineno">  644</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> BitField1, <span class="keywordtype">int</span> FirstBit1, <span class="keywordtype">bool</span> Mutable1&gt;</div><div class="line"><a name="l00645"></a><span class="lineno">  645</span>&#160;    <span class="keyword">const</span> packed_dynamic_channel_reference&amp; operator=(<span class="keyword">const</span> packed_channel_reference&lt;BitField1, FirstBit1, NumBits, Mutable1&gt;&amp; ref)<span class="keyword"> const</span></div><div class="line"><a name="l00646"></a><span class="lineno">  646</span>&#160;<span class="keyword">        </span>{  set_unsafe(ref.get()); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00647"></a><span class="lineno">  647</span>&#160;</div><div class="line"><a name="l00648"></a><span class="lineno">  648</span>&#160;    <span class="keywordtype">unsigned</span> first_bit()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _first_bit; }</div><div class="line"><a name="l00649"></a><span class="lineno">  649</span>&#160;</div><div class="line"><a name="l00650"></a><span class="lineno">  650</span>&#160;    integer_t get()<span class="keyword"> const </span>{</div><div class="line"><a name="l00651"></a><span class="lineno">  651</span>&#160;        <span class="keyword">const</span> BitField channel_mask = static_cast&lt; integer_t &gt;( parent_t::max_val ) &lt;&lt; _first_bit;</div><div class="line"><a name="l00652"></a><span class="lineno">  652</span>&#160;        <span class="keywordflow">return</span> static_cast&lt; integer_t &gt;(( this-&gt;get_data()&amp;channel_mask ) &gt;&gt; _first_bit );</div><div class="line"><a name="l00653"></a><span class="lineno">  653</span>&#160;    }</div><div class="line"><a name="l00654"></a><span class="lineno">  654</span>&#160;</div><div class="line"><a name="l00655"></a><span class="lineno">  655</span>&#160;    <span class="keywordtype">void</span> set_unsafe(integer_t value)<span class="keyword"> const </span>{</div><div class="line"><a name="l00656"></a><span class="lineno">  656</span>&#160;        <span class="keyword">const</span> BitField channel_mask = static_cast&lt; integer_t &gt;( parent_t::max_val ) &lt;&lt; _first_bit;</div><div class="line"><a name="l00657"></a><span class="lineno">  657</span>&#160;        this-&gt;set_data((this-&gt;get_data() &amp; ~channel_mask) | value&lt;&lt;_first_bit);</div><div class="line"><a name="l00658"></a><span class="lineno">  658</span>&#160;    }</div><div class="line"><a name="l00659"></a><span class="lineno">  659</span>&#160;};</div><div class="line"><a name="l00660"></a><span class="lineno">  660</span>&#160;} }  <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00661"></a><span class="lineno">  661</span>&#160;</div><div class="line"><a name="l00662"></a><span class="lineno">  662</span>&#160;<span class="keyword">namespace </span>std {</div><div class="line"><a name="l00663"></a><span class="lineno">  663</span>&#160;<span class="comment">// We are forced to define swap inside std namespace because on some platforms (Visual Studio 8) STL calls swap qualified.</span></div><div class="line"><a name="l00664"></a><span class="lineno">  664</span>&#160;<span class="comment">// swap with &#39;left bias&#39;:</span></div><div class="line"><a name="l00665"></a><span class="lineno">  665</span>&#160;<span class="comment">// - swap between proxy and anything</span></div><div class="line"><a name="l00666"></a><span class="lineno">  666</span>&#160;<span class="comment">// - swap between value type and proxy</span></div><div class="line"><a name="l00667"></a><span class="lineno">  667</span>&#160;<span class="comment">// - swap between proxy and proxy</span></div><div class="line"><a name="l00668"></a><span class="lineno">  668</span>&#160;</div><div class="line"><a name="l00669"></a><span class="lineno">  669</span>&#160;</div><div class="line"><a name="l00672"></a><span class="lineno">  672</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> BF, <span class="keywordtype">int</span> NB, <span class="keywordtype">bool</span> M, <span class="keyword">typename</span> R&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00673"></a><span class="lineno"><a class="line" href="group___packed_channel_dynamic_reference_model.html#ga787db0870b8b34244289b895ed8345e2">  673</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group___packed_channel_dynamic_reference_model.html#gac4c1b188cdeb2280d9c803726e4d2cdc">swap</a>(<span class="keyword">const</span> boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt; x, R&amp; y) {</div><div class="line"><a name="l00674"></a><span class="lineno">  674</span>&#160;    boost::gil::swap_proxy&lt;typename boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt;::value_type&gt;(x,y);</div><div class="line"><a name="l00675"></a><span class="lineno">  675</span>&#160;}</div><div class="line"><a name="l00676"></a><span class="lineno">  676</span>&#160;</div><div class="line"><a name="l00677"></a><span class="lineno">  677</span>&#160;</div><div class="line"><a name="l00680"></a><span class="lineno">  680</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> BF, <span class="keywordtype">int</span> NB, <span class="keywordtype">bool</span> M&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00681"></a><span class="lineno"><a class="line" href="group___packed_channel_dynamic_reference_model.html#gab7ea281b0cce57c44a9046f732e4112b">  681</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group___packed_channel_dynamic_reference_model.html#gac4c1b188cdeb2280d9c803726e4d2cdc">swap</a>(<span class="keyword">typename</span> boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt;::value_type&amp; x, <span class="keyword">const</span> boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt; y) {</div><div class="line"><a name="l00682"></a><span class="lineno">  682</span>&#160;    boost::gil::swap_proxy&lt;typename boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt;::value_type&gt;(x,y);</div><div class="line"><a name="l00683"></a><span class="lineno">  683</span>&#160;}</div><div class="line"><a name="l00684"></a><span class="lineno">  684</span>&#160;</div><div class="line"><a name="l00687"></a><span class="lineno">  687</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> BF, <span class="keywordtype">int</span> NB, <span class="keywordtype">bool</span> M&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00688"></a><span class="lineno"><a class="line" href="group___packed_channel_dynamic_reference_model.html#gac4c1b188cdeb2280d9c803726e4d2cdc">  688</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group___packed_channel_dynamic_reference_model.html#gac4c1b188cdeb2280d9c803726e4d2cdc">swap</a>(<span class="keyword">const</span> boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt; x, <span class="keyword">const</span> boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt; y) {</div><div class="line"><a name="l00689"></a><span class="lineno">  689</span>&#160;    boost::gil::swap_proxy&lt;typename boost::gil::packed_dynamic_channel_reference&lt;BF,NB,M&gt;::value_type&gt;(x,y);</div><div class="line"><a name="l00690"></a><span class="lineno">  690</span>&#160;}</div><div class="line"><a name="l00691"></a><span class="lineno">  691</span>&#160;}   <span class="comment">// namespace std</span></div><div class="line"><a name="l00692"></a><span class="lineno">  692</span>&#160;</div><div class="line"><a name="l00693"></a><span class="lineno">  693</span>&#160;<span class="comment">// \brief Determines the fundamental type which may be used, e.g., to cast from larger to smaller channel types.</span></div><div class="line"><a name="l00694"></a><span class="lineno">  694</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00695"></a><span class="lineno">  695</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00696"></a><span class="lineno">  696</span>&#160;<span class="keyword">struct </span>base_channel_type_impl { <span class="keyword">using</span> type = T; };</div><div class="line"><a name="l00697"></a><span class="lineno">  697</span>&#160;</div><div class="line"><a name="l00698"></a><span class="lineno">  698</span>&#160;<span class="keyword">template</span> &lt;<span class="keywordtype">int</span> N&gt;</div><div class="line"><a name="l00699"></a><span class="lineno">  699</span>&#160;<span class="keyword">struct </span>base_channel_type_impl&lt;packed_channel_value&lt;N&gt; &gt;</div><div class="line"><a name="l00700"></a><span class="lineno">  700</span>&#160;{ <span class="keyword">using</span> type = <span class="keyword">typename</span> packed_channel_value&lt;N&gt;::integer_t; };</div><div class="line"><a name="l00701"></a><span class="lineno">  701</span>&#160;</div><div class="line"><a name="l00702"></a><span class="lineno">  702</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> B, <span class="keywordtype">int</span> F, <span class="keywordtype">int</span> N, <span class="keywordtype">bool</span> M&gt;</div><div class="line"><a name="l00703"></a><span class="lineno">  703</span>&#160;<span class="keyword">struct </span>base_channel_type_impl&lt;packed_channel_reference&lt;B, F, N, M&gt; &gt;</div><div class="line"><a name="l00704"></a><span class="lineno">  704</span>&#160;{</div><div class="line"><a name="l00705"></a><span class="lineno">  705</span>&#160;    <span class="keyword">using</span> type = <span class="keyword">typename</span> packed_channel_reference&lt;B,F,N,M&gt;::integer_t;</div><div class="line"><a name="l00706"></a><span class="lineno">  706</span>&#160;};</div><div class="line"><a name="l00707"></a><span class="lineno">  707</span>&#160;</div><div class="line"><a name="l00708"></a><span class="lineno">  708</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> B, <span class="keywordtype">int</span> N, <span class="keywordtype">bool</span> M&gt;</div><div class="line"><a name="l00709"></a><span class="lineno">  709</span>&#160;<span class="keyword">struct </span>base_channel_type_impl&lt;packed_dynamic_channel_reference&lt;B, N, M&gt; &gt;</div><div class="line"><a name="l00710"></a><span class="lineno">  710</span>&#160;{</div><div class="line"><a name="l00711"></a><span class="lineno">  711</span>&#160;    <span class="keyword">using</span> type = <span class="keyword">typename</span> packed_dynamic_channel_reference&lt;B,N,M&gt;::integer_t;</div><div class="line"><a name="l00712"></a><span class="lineno">  712</span>&#160;};</div><div class="line"><a name="l00713"></a><span class="lineno">  713</span>&#160;</div><div class="line"><a name="l00714"></a><span class="lineno">  714</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> ChannelValue, <span class="keyword">typename</span> MinV, <span class="keyword">typename</span> MaxV&gt;</div><div class="line"><a name="l00715"></a><span class="lineno">  715</span>&#160;<span class="keyword">struct </span>base_channel_type_impl&lt;scoped_channel_value&lt;ChannelValue, MinV, MaxV&gt; &gt;</div><div class="line"><a name="l00716"></a><span class="lineno">  716</span>&#160;{ <span class="keyword">using</span> type = ChannelValue; };</div><div class="line"><a name="l00717"></a><span class="lineno">  717</span>&#160;</div><div class="line"><a name="l00718"></a><span class="lineno">  718</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00719"></a><span class="lineno">  719</span>&#160;<span class="keyword">struct </span>base_channel_type : base_channel_type_impl&lt;typename std::remove_cv&lt;T&gt;::type&gt; {};</div><div class="line"><a name="l00720"></a><span class="lineno">  720</span>&#160;</div><div class="line"><a name="l00721"></a><span class="lineno">  721</span>&#160;}} <span class="comment">//namespace boost::gil</span></div><div class="line"><a name="l00722"></a><span class="lineno">  722</span>&#160;</div><div class="line"><a name="l00723"></a><span class="lineno">  723</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="group___packed_channel_dynamic_reference_model_html_gac4c1b188cdeb2280d9c803726e4d2cdc"><div class="ttname"><a href="group___packed_channel_dynamic_reference_model.html#gac4c1b188cdeb2280d9c803726e4d2cdc">std::swap</a></div><div class="ttdeci">void swap(const boost::gil::packed_dynamic_channel_reference&lt; BF, NB, M &gt; x, const boost::gil::packed_dynamic_channel_reference&lt; BF, NB, M &gt; y)</div><div class="ttdoc">swap for packed_dynamic_channel_reference</div><div class="ttdef"><b>Definition:</b> channel.hpp:688</div></div>
    51. 

  51. <div class="ttc" id="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01false_01_4_html"><div class="ttname"><a href="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01false_01_4.html">boost::gil::packed_dynamic_channel_reference&lt; BitField, NumBits, false &gt;</a></div><div class="ttdoc">Models a constant subbyte channel reference whose bit offset is a runtime parameter....</div><div class="ttdef"><b>Definition:</b> channel.hpp:588</div></div>
    52. 

  52. <div class="ttc" id="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01true_01_4_html"><div class="ttname"><a href="classboost_1_1gil_1_1packed__dynamic__channel__reference_3_01_bit_field_00_01_num_bits_00_01true_01_4.html">boost::gil::packed_dynamic_channel_reference&lt; BitField, NumBits, true &gt;</a></div><div class="ttdoc">Models a mutable subbyte channel reference whose bit offset is a runtime parameter....</div><div class="ttdef"><b>Definition:</b> channel.hpp:618</div></div>
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