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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_COLOR_CONVERT_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_COLOR_CONVERT_HPP</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &lt;boost/gil/channel_algorithm.hpp&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;boost/gil/cmyk.hpp&gt;</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;boost/gil/color_base_algorithm.hpp&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;boost/gil/gray.hpp&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;boost/gil/metafunctions.hpp&gt;</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;boost/gil/pixel.hpp&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;boost/gil/rgb.hpp&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;boost/gil/rgba.hpp&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;boost/gil/utilities.hpp&gt;</span></div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#include &lt;functional&gt;</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">// Forward-declare</span></div><div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__type.html">   31</a></span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt; <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__type.html">channel_type</a>;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C1, <span class="keyword">typename</span> C2&gt;</div><div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl.html">   42</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a> {};</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C&gt;</div><div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl_3_01_c_00_01_c_01_4.html">   47</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a>&lt;C,C&gt; {</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P1, <span class="keyword">typename</span> P2&gt;</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> P1&amp; src, P2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        static_for_each(src,dst,<a class="code" href="structboost_1_1gil_1_1default__channel__converter.html">default_channel_converter</a>());</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    }</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;};</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>detail {</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">// The default implementation of to_luminance uses float0..1 as the intermediate channel type</span></div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> RedChannel, <span class="keyword">typename</span> GreenChannel, <span class="keyword">typename</span> BlueChannel, <span class="keyword">typename</span> GrayChannelValue&gt;</div><div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1detail_1_1rgb__to__luminance__fn.html">   60</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1detail_1_1rgb__to__luminance__fn.html">rgb_to_luminance_fn</a> {</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    GrayChannelValue operator()(<span class="keyword">const</span> RedChannel&amp; red, <span class="keyword">const</span> GreenChannel&amp; green, <span class="keyword">const</span> BlueChannel&amp; blue)<span class="keyword"> const </span>{</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="keywordflow">return</span> channel_convert&lt;GrayChannelValue&gt;(<a class="code" href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">float32_t</a>(</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;            channel_convert&lt;float32_t&gt;(red  )*0.30f +</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;            channel_convert&lt;float32_t&gt;(green)*0.59f +</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;            channel_convert&lt;float32_t&gt;(blue )*0.11f) );</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    }</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;};</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">// performance specialization for unsigned char</span></div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> GrayChannelValue&gt;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1detail_1_1rgb__to__luminance__fn.html">rgb_to_luminance_fn</a>&lt;uint8_t,uint8_t,uint8_t, GrayChannelValue&gt; {</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    GrayChannelValue operator()(uint8_t red, uint8_t green, uint8_t blue)<span class="keyword"> const </span>{</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;        <span class="keywordflow">return</span> channel_convert&lt;GrayChannelValue&gt;(uint8_t(</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;            ((uint32_t(red  )*4915 + uint32_t(green)*9667 + uint32_t(blue )*1802) + 8192) &gt;&gt; 14));</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;};</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> GrayChannel, <span class="keyword">typename</span> RedChannel, <span class="keyword">typename</span> GreenChannel, <span class="keyword">typename</span> BlueChannel&gt;</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="keyword">typename</span> channel_traits&lt;GrayChannel&gt;::value_type rgb_to_luminance(<span class="keyword">const</span> RedChannel&amp; red, <span class="keyword">const</span> GreenChannel&amp; green, <span class="keyword">const</span> BlueChannel&amp; blue) {</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    <span class="keywordflow">return</span> rgb_to_luminance_fn&lt;RedChannel,GreenChannel,BlueChannel,</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;                               <span class="keyword">typename</span> channel_traits&lt;GrayChannel&gt;::value_type&gt;()(red,green,blue);</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;}</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;}   <span class="comment">// namespace detail</span></div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00089"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl_3_01gray__t_00_01rgb__t_01_4.html">   89</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a>&lt;gray_t,rgb_t&gt; {</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P1, <span class="keyword">typename</span> P2&gt;</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> P1&amp; src, P2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1red__t.html">red_t</a>())  =</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;            channel_convert&lt;typename color_element_type&lt;P2, red_t  &gt;::type&gt;(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1gray__color__t.html">gray_color_t</a>()));</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1green__t.html">green_t</a>())=</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;            channel_convert&lt;typename color_element_type&lt;P2, green_t&gt;::type&gt;(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1gray__color__t.html">gray_color_t</a>()));</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1blue__t.html">blue_t</a>()) =</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;            channel_convert&lt;typename color_element_type&lt;P2, blue_t &gt;::type&gt;(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1gray__color__t.html">gray_color_t</a>()));</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    }</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;};</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00104"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl_3_01gray__t_00_01cmyk__t_01_4.html">  104</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a>&lt;gray_t,cmyk_t&gt; {</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> P1, <span class="keyword">typename</span> P2&gt;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> P1&amp; src, P2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1cyan__t.html">cyan_t</a>())=</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;            channel_traits&lt;typename color_element_type&lt;P2, cyan_t   &gt;::type&gt;::min_value();</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1magenta__t.html">magenta_t</a>())=</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;            channel_traits&lt;typename color_element_type&lt;P2, magenta_t&gt;::type&gt;::min_value();</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1yellow__t.html">yellow_t</a>())=</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;            channel_traits&lt;typename color_element_type&lt;P2, yellow_t &gt;::type&gt;::min_value();</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1black__t.html">black_t</a>())=</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;            channel_convert&lt;typename color_element_type&lt;P2, black_t &gt;::type&gt;(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1gray__color__t.html">gray_color_t</a>()));</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    }</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;};</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl_3_01rgb__t_00_01gray__t_01_4.html">  121</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a>&lt;rgb_t,gray_t&gt; {</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P1, <span class="keyword">typename</span> P2&gt;</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> P1&amp; src, P2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1gray__color__t.html">gray_color_t</a>()) =</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;            detail::rgb_to_luminance&lt;typename color_element_type&lt;P2,gray_color_t&gt;::type&gt;(</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;                <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1red__t.html">red_t</a>()), <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1green__t.html">green_t</a>()), <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1blue__t.html">blue_t</a>())</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;            );</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    }</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;};</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;<span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00140"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl_3_01rgb__t_00_01cmyk__t_01_4.html">  140</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a>&lt;rgb_t,cmyk_t&gt; {</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> P1, <span class="keyword">typename</span> P2&gt;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> P1&amp; src, P2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;        <span class="keyword">using</span> T2 = <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__type.html">channel_type&lt;P2&gt;::type</a>;</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1cyan__t.html">cyan_t</a>())    = <a class="code" href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">channel_invert</a>(channel_convert&lt;T2&gt;(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1red__t.html">red_t</a>())));          <span class="comment">// c = 1 - r</span></div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1magenta__t.html">magenta_t</a>()) = <a class="code" href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">channel_invert</a>(channel_convert&lt;T2&gt;(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1green__t.html">green_t</a>())));        <span class="comment">// m = 1 - g</span></div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1yellow__t.html">yellow_t</a>())  = <a class="code" href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">channel_invert</a>(channel_convert&lt;T2&gt;(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1blue__t.html">blue_t</a>())));         <span class="comment">// y = 1 - b</span></div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1black__t.html">black_t</a>())   = (std::min)(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1cyan__t.html">cyan_t</a>()),</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;                                                (std::min)(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1magenta__t.html">magenta_t</a>()),</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;          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><span class="lineno">  215</span>&#160;</div><div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Pixel&gt;</div><div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;<span class="keyword">auto</span> alpha_or_max_impl(Pixel <span class="keyword">const</span>&amp; p, std::true_type) -&gt; <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__type.html">channel_type&lt;Pixel&gt;::type</a></div><div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;{</div><div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    <span class="keywordflow">return</span> <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(p,<a class="code" href="structboost_1_1gil_1_1alpha__t.html">alpha_t</a>());</div><div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;}</div><div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Pixel&gt;</div><div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;<span class="keyword">auto</span> alpha_or_max_impl(Pixel <span class="keyword">const</span>&amp;, std::false_type) -&gt; <span class="keyword">typename</span> channel_type&lt;Pixel&gt;::type</div><div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;{</div><div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;    <span class="keywordflow">return</span> channel_traits&lt;typename channel_type&lt;Pixel&gt;::type&gt;::max_value();</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;</div><div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;</div><div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;<span class="comment">// Returns max_value if the pixel has no alpha channel. Otherwise returns the alpha.</span></div><div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Pixel&gt;</div><div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;<span class="keyword">auto</span> alpha_or_max(Pixel <span class="keyword">const</span>&amp; p) -&gt; <span class="keyword">typename</span> channel_type&lt;Pixel&gt;::type</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="keywordflow">return</span> detail::alpha_or_max_impl(</div><div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;        p,</div><div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;        mp11::mp_contains&lt;<span class="keyword">typename</span> color_space_type&lt;Pixel&gt;::type, alpha_t&gt;());</div><div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;}</div><div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;</div><div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;</div><div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C1&gt;</div><div class="line"><a name="l00242"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl_3_01_c1_00_01rgba__t_01_4.html">  242</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a>&lt;C1,rgba_t&gt; {</div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P1, <span class="keyword">typename</span> P2&gt;</div><div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> P1&amp; src, P2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;        <span class="keyword">using</span> T2 = <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__type.html">channel_type&lt;P2&gt;::type</a>;</div><div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;        <a class="code" href="structboost_1_1gil_1_1pixel.html">pixel&lt;T2,rgb_layout_t&gt;</a> tmp;</div><div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;        <a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl&lt;C1,rgb_t&gt;</a>()(src,tmp);</div><div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1red__t.html">red_t</a>())  =<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(tmp,<a class="code" href="structboost_1_1gil_1_1red__t.html">red_t</a>());</div><div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1green__t.html">green_t</a>())=<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(tmp,<a class="code" href="structboost_1_1gil_1_1green__t.html">green_t</a>());</div><div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1blue__t.html">blue_t</a>()) =<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(tmp,<a class="code" href="structboost_1_1gil_1_1blue__t.html">blue_t</a>());</div><div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;        <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(dst,<a class="code" href="structboost_1_1gil_1_1alpha__t.html">alpha_t</a>())=channel_convert&lt;T2&gt;(alpha_or_max(src));</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    }</div><div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;};</div><div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C2&gt;</div><div class="line"><a name="l00262"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1default__color__converter__impl_3_01rgba__t_00_01_c2_01_4.html">  262</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl</a>&lt;rgba_t,C2&gt; {</div><div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P1, <span class="keyword">typename</span> P2&gt;</div><div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;    <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> P1&amp; src, P2&amp; dst)<span class="keyword"> const </span>{</div><div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;        <span class="keyword">using</span> T1 = <span class="keyword">typename</span> <a class="code" href="structboost_1_1gil_1_1channel__type.html">channel_type&lt;P1&gt;::type</a>;</div><div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;        <a class="code" href="structboost_1_1gil_1_1default__color__converter__impl.html">default_color_converter_impl&lt;rgb_t,C2&gt;</a>()(</div><div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;            <a class="code" href="structboost_1_1gil_1_1pixel.html">pixel&lt;T1,rgb_layout_t&gt;</a>(<a class="code" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">channel_multiply</a>(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1red__t.html">red_t</a>()),  <a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1alpha__t.html">alpha_t</a>())),</div><div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;                                   <a class="code" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">channel_multiply</a>(<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1green__t.html">green_t</a>()),<a class="code" href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">get_color</a>(src,<a class="code" href="structboost_1_1gil_1_1alpha__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  51 <div class="ttc" id="group___channel_invert_algorithm_html_gabbbc7b27d9f61ff45cf5ea7ac21051f5"><div class="ttname"><a href="group___channel_invert_algorithm.html#gabbbc7b27d9f61ff45cf5ea7ac21051f5">boost::gil::channel_invert</a></div><div class="ttdeci">channel_traits&lt; Channel &gt;::value_type channel_invert(Channel x)</div><div class="ttdoc">Default implementation. Provide overloads for performance.</div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:559</div></div>
  52 <div class="ttc" id="structboost_1_1gil_1_1pixel_html"><div class="ttname"><a href="structboost_1_1gil_1_1pixel.html">boost::gil::pixel</a></div><div class="ttdoc">Represents a pixel value (a container of channels). Models: HomogeneousColorBaseValueConcept,...</div><div class="ttdef"><b>Definition:</b> metafunctions.hpp:23</div></div>
  53 <div class="ttc" id="group___channel_model_html_gaa70e2f51d4342cd54a28684f20c6135b"><div class="ttname"><a href="group___channel_model.html#gaa70e2f51d4342cd54a28684f20c6135b">boost::gil::float32_t</a></div><div class="ttdeci">scoped_channel_value&lt; float, float_point_zero&lt; float &gt;, float_point_one&lt; float &gt; &gt; float32_t</div><div class="ttdoc">32-bit floating point channel type with range [0.0f ... 1.0f]. Models ChannelValueConcept</div><div class="ttdef"><b>Definition:</b> typedefs.hpp:124</div></div>
  54 <div class="ttc" id="structboost_1_1gil_1_1yellow__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1yellow__t.html">boost::gil::yellow_t</a></div><div class="ttdoc">Yellow.</div><div class="ttdef"><b>Definition:</b> cmyk.hpp:28</div></div>
  55 <div class="ttc" id="group___channel_multiply_algorithm_html_ga0af81efbbb77846afe2570f242d2b974"><div class="ttname"><a href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">boost::gil::channel_multiply</a></div><div class="ttdeci">channel_traits&lt; Channel &gt;::value_type channel_multiply(Channel a, Channel b)</div><div class="ttdoc">A function multiplying two channels. result = a * b / max_value.</div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:539</div></div>
  56 <div class="ttc" id="group___color_base_algorithm_color_html_gab2d1dda637cb2b7c32cc87f199ea1dc0"><div class="ttname"><a href="group___color_base_algorithm_color.html#gab2d1dda637cb2b7c32cc87f199ea1dc0">boost::gil::get_color</a></div><div class="ttdeci">color_element_reference_type&lt; ColorBase, Color &gt;::type get_color(ColorBase &amp;cb, Color=Color())</div><div class="ttdoc">Mutable accessor to the element associated with a given color name.</div><div class="ttdef"><b>Definition:</b> color_base_algorithm.hpp:190</div></div>
  57 <div class="ttc" id="structboost_1_1gil_1_1green__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1green__t.html">boost::gil::green_t</a></div><div class="ttdoc">Green.</div><div class="ttdef"><b>Definition:</b> rgb.hpp:27</div></div>
  58 <div class="ttc" id="structboost_1_1gil_1_1default__channel__converter_html"><div class="ttname"><a href="structboost_1_1gil_1_1default__channel__converter.html">boost::gil::default_channel_converter</a></div><div class="ttdoc">Same as channel_converter, except it takes the destination channel by reference, which allows us to m...</div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:460</div></div>
  59 <div class="ttc" id="structboost_1_1gil_1_1alpha__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1alpha__t.html">boost::gil::alpha_t</a></div><div class="ttdoc">Alpha.</div><div class="ttdef"><b>Definition:</b> rgba.hpp:22</div></div>
  60 <div class="ttc" id="structboost_1_1gil_1_1channel__type_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__type.html">boost::gil::channel_type</a></div><div class="ttdef"><b>Definition:</b> color_convert.hpp:31</div></div>
  61 <div class="ttc" id="structboost_1_1gil_1_1default__color__converter__impl_html"><div class="ttname"><a href="structboost_1_1gil_1_1default__color__converter__impl.html">boost::gil::default_color_converter_impl</a></div><div class="ttdoc">Color Convertion function object. To be specialized for every src/dst color space.</div><div class="ttdef"><b>Definition:</b> color_convert.hpp:42</div></div>
  62 <div class="ttc" id="structboost_1_1gil_1_1blue__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1blue__t.html">boost::gil::blue_t</a></div><div class="ttdoc">Blue.</div><div class="ttdef"><b>Definition:</b> rgb.hpp:30</div></div>
  63 <div class="ttc" id="group___pixel_algorithm_html_ga2c2107ab8394425575732b46125e2076"><div class="ttname"><a href="group___pixel_algorithm.html#ga2c2107ab8394425575732b46125e2076">boost::gil::color_convert</a></div><div class="ttdeci">void color_convert(const SrcP &amp;src, DstP &amp;dst)</div><div class="ttdoc">helper function for converting one pixel to another using GIL default color-converters where ScrP mod...</div><div class="ttdef"><b>Definition:</b> color_convert.hpp:304</div></div>
  64 <div class="ttc" id="structboost_1_1gil_1_1detail_1_1rgb__to__luminance__fn_html"><div class="ttname"><a href="structboost_1_1gil_1_1detail_1_1rgb__to__luminance__fn.html">boost::gil::detail::rgb_to_luminance_fn</a></div><div class="ttdoc">red * .3 + green * .59 + blue * .11 + .5</div><div class="ttdef"><b>Definition:</b> color_convert.hpp:60</div></div>
  65 <div class="ttc" id="structboost_1_1gil_1_1black__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1black__t.html">boost::gil::black_t</a></div><div class="ttdoc">Black.</div><div class="ttdef"><b>Definition:</b> cmyk.hpp:31</div></div>
  66 <div class="ttc" id="structboost_1_1gil_1_1red__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1red__t.html">boost::gil::red_t</a></div><div class="ttdoc">Red.</div><div class="ttdef"><b>Definition:</b> rgb.hpp:24</div></div>
  67 <div class="ttc" id="structboost_1_1gil_1_1gray__color__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1gray__color__t.html">boost::gil::gray_color_t</a></div><div class="ttdoc">Gray.</div><div class="ttdef"><b>Definition:</b> gray.hpp:18</div></div>
  68 <div class="ttc" id="structboost_1_1gil_1_1cyan__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1cyan__t.html">boost::gil::cyan_t</a></div><div class="ttdoc">Cyan.</div><div class="ttdef"><b>Definition:</b> cmyk.hpp:22</div></div>
  69 <div class="ttc" id="structboost_1_1gil_1_1default__color__converter_html"><div class="ttname"><a href="structboost_1_1gil_1_1default__color__converter.html">boost::gil::default_color_converter</a></div><div class="ttdoc">class for color-converting one pixel to another</div><div class="ttdef"><b>Definition:</b> color_convert.hpp:290</div></div>
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