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- <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright 2005-2007 Adobe Systems Incorporated</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Distributed under the Boost Software License, Version 1.0</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// See accompanying file LICENSE_1_0.txt or copy at</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// http://www.boost.org/LICENSE_1_0.txt</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#ifndef BOOST_GIL_LOCATOR_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BOOST_GIL_LOCATOR_HPP</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <boost/gil/dynamic_step.hpp></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/pixel_iterator.hpp></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <boost/gil/point.hpp></span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <boost/assert.hpp></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <cstddef></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">//forward declarations</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">template</span> <<span class="keyword">typename</span> P> std::ptrdiff_t memunit_step(<span class="keyword">const</span> P*);</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">template</span> <<span class="keyword">typename</span> P> P* memunit_advanced(<span class="keyword">const</span> P* p, std::ptrdiff_t diff);</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">template</span> <<span class="keyword">typename</span> P> P& memunit_advanced_ref(P* p, std::ptrdiff_t diff);</div><div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1iterator__add__deref.html"> 27</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator, <span class="keyword">typename</span> D> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1iterator__add__deref.html">iterator_add_deref</a>;</div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1point.html"> 28</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">class </span><a class="code" href="classboost_1_1gil_1_1point.html">point</a>;</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="comment">// helper class specialized for each axis of pixel_2d_locator</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keyword">template</span> <std::<span class="keywordtype">size_t</span> D, <span class="keyword">typename</span> Loc> <span class="keyword">class </span>locator_axis;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> }</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T> <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="l00035"></a><span class="lineno"> 35</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">struct </span>color_space_type;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">struct </span>channel_mapping_type;</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">struct </span>is_planar;</div><div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1num__channels.html"> 38</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1num__channels.html">num_channels</a>;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">template</span> <<span class="keyword">typename</span> LocatorOrView></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1transposed__type.html">transposed_type</a></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> {</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">using</span> type = LocatorOrView;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> };</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIterator, <span class="keyword">typename</span> YIterator> <span class="comment">// The concrete subclass, the X-iterator and the Y-iterator</span></div><div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1pixel__2d__locator__base.html"> 109</a></span> <span class="keyword">class </span><a class="code" href="classboost_1_1gil_1_1pixel__2d__locator__base.html">pixel_2d_locator_base</a></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> {</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">using</span> x_iterator = XIterator;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keyword">using</span> y_iterator = YIterator;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">// aliasesrequired by ConstRandomAccessNDLocatorConcept</span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">static</span> <span class="keyword">const</span> std::size_t num_dimensions=2;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">using</span> value_type = <span class="keyword">typename</span> std::iterator_traits<x_iterator>::value_type;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">using</span> reference = <span class="keyword">typename</span> std::iterator_traits<x_iterator>::reference; <span class="comment">// result of dereferencing</span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> std::iterator_traits<x_iterator>::difference_type; <span class="comment">// 1D difference type (same for all dimensions)</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a> = <a class="code" href="classboost_1_1gil_1_1point.html">point<coord_t></a>; <span class="comment">// result of operator-(locator,locator)</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a> = <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keyword">template</span> <std::<span class="keywordtype">size_t</span> D> <span class="keyword">struct </span>axis</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  {</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> detail::locator_axis<D,Loc>::coord_t;</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keyword">using</span> iterator = <span class="keyword">typename</span> detail::locator_axis<D,Loc>::iterator;</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  };</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment">// aliases required by ConstRandomAccess2DLocatorConcept</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keyword">using</span> x_coord_t = <span class="keyword">typename</span> point_t::template axis<0>::coord_t;</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keyword">using</span> y_coord_t = <span class="keyword">typename</span> point_t::template axis<1>::coord_t;</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> Loc& p)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> !(concrete()==p); }</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  x_iterator x_at(x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ Loc tmp=concrete(); tmp+=<a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>(dx,dy); <span class="keywordflow">return</span> tmp.x(); }</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  x_iterator x_at(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d)<span class="keyword"> const </span>{ Loc tmp=concrete(); tmp+=d; <span class="keywordflow">return</span> tmp.x(); }</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  y_iterator y_at(x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ Loc tmp=concrete(); tmp+=<a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>(dx,dy); <span class="keywordflow">return</span> tmp.y(); }</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  y_iterator y_at(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d)<span class="keyword"> const </span>{ Loc tmp=concrete(); tmp+=d; <span class="keywordflow">return</span> tmp.y(); }</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  Loc xy_at(x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ Loc tmp=concrete(); tmp+=<a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>(dx,dy); <span class="keywordflow">return</span> tmp; }</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  Loc xy_at(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d)<span class="keyword"> const </span>{ Loc tmp=concrete(); tmp+=d; <span class="keywordflow">return</span> tmp; }</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keyword">template</span> <std::<span class="keywordtype">size_t</span> D> <span class="keyword">typename</span> axis<D>::iterator& axis_iterator() { <span class="keywordflow">return</span> detail::locator_axis<D,Loc>()(concrete()); }</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keyword">template</span> <std::<span class="keywordtype">size_t</span> D> <span class="keyword">typename</span> axis<D>::iterator <span class="keyword">const</span>& axis_iterator()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> detail::locator_axis<D,Loc>()(concrete()); }</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keyword">template</span> <std::<span class="keywordtype">size_t</span> D> <span class="keyword">typename</span> axis<D>::iterator axis_iterator(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>& p)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> detail::locator_axis<D,Loc>()(concrete(),p); }</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  reference operator()(x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *x_at(dx,dy); }</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  reference operator[](<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *x_at(d.x,d.y); }</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  reference operator*()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *concrete().x(); }</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  Loc& operator+=(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d) { concrete().x()+=d.x; concrete().y()+=d.y; <span class="keywordflow">return</span> concrete(); }</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  Loc& operator-=(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d) { concrete().x()-=d.x; concrete().y()-=d.y; <span class="keywordflow">return</span> concrete(); }</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  Loc operator+(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> xy_at(d); }</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  Loc operator-(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> xy_at(-d); }</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">// Some locators can cache 2D coordinates for faster subsequent access. By default there is no caching</span></div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">cached_location_t</a> = <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>;</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <a class="code" href="classboost_1_1gil_1_1point.html">cached_location_t</a> cache_location(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d; }</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <a class="code" href="classboost_1_1gil_1_1point.html">cached_location_t</a> cache_location(x_coord_t dx, y_coord_t dy)<span class="keyword">const </span>{ <span class="keywordflow">return</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>(dx,dy); }</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  Loc& concrete() { <span class="keywordflow">return</span> (Loc&)*<span class="keyword">this</span>; }</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keyword">const</span> Loc& concrete()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> (<span class="keyword">const</span> Loc&)*<span class="keyword">this</span>; }</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> X> <span class="keyword">friend</span> <span class="keyword">class </span>pixel_2d_locator;</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> };</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment">// helper classes for each axis of pixel_2d_locator_base</span></div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> Loc></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keyword">class </span>locator_axis<0,Loc> {</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a> = <span class="keyword">typename</span> Loc::point_t;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> point_t::template axis<0>::coord_t;</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keyword">using</span> iterator = <span class="keyword">typename</span> Loc::x_iterator;</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keyword">inline</span> iterator& operator()( Loc& loc)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.x(); }</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keyword">inline</span> iterator <span class="keyword">const</span>& operator()(<span class="keyword">const</span> Loc& loc)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.x(); }</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keyword">inline</span> iterator operator()( Loc& loc, <span class="keyword">const</span> point_t& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.x_at(d); }</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keyword">inline</span> iterator operator()(<span class="keyword">const</span> Loc& loc, <span class="keyword">const</span> point_t& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.x_at(d); }</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  };</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> Loc></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keyword">class </span>locator_axis<1,Loc> {</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keyword">using</span> point_t = <span class="keyword">typename</span> Loc::point_t;</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> point_t::template axis<1>::coord_t;</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keyword">using</span> iterator = <span class="keyword">typename</span> Loc::y_iterator;</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span> </div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keyword">inline</span> iterator& operator()( Loc& loc)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.y(); }</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keyword">inline</span> iterator <span class="keyword">const</span>& operator()(<span class="keyword">const</span> Loc& loc)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.y(); }</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">inline</span> iterator operator()( Loc& loc, <span class="keyword">const</span> point_t& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.y_at(d); }</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keyword">inline</span> iterator operator()(<span class="keyword">const</span> Loc& loc, <span class="keyword">const</span> point_t& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.y_at(d); }</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  };</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> }</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt></div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="keyword">struct </span>channel_type<pixel_2d_locator_base<Loc,XIt,YIt> > : <span class="keyword">public</span> channel_type<XIt> {};</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="keyword">struct </span>color_space_type<pixel_2d_locator_base<Loc,XIt,YIt> > : <span class="keyword">public</span> color_space_type<XIt> {};</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> </div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="keyword">struct </span>channel_mapping_type<pixel_2d_locator_base<Loc,XIt,YIt> > : <span class="keyword">public</span> channel_mapping_type<XIt> {};</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt></div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="keyword">struct </span>is_planar<pixel_2d_locator_base<Loc,XIt,YIt> > : <span class="keyword">public</span> is_planar<XIt> {};</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="keyword">template</span> <<span class="keyword">typename</span> StepIterator></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="keyword">class </span>memory_based_2d_locator : <span class="keyword">public</span> pixel_2d_locator_base<memory_based_2d_locator<StepIterator>, typename iterator_adaptor_get_base<StepIterator>::type, StepIterator> {</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keyword">using</span> this_t = memory_based_2d_locator<StepIterator>;</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  GIL_CLASS_REQUIRE(StepIterator, boost::gil, StepIteratorConcept)</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keyword">using</span> parent_t = pixel_2d_locator_base<memory_based_2d_locator<StepIterator>, <span class="keyword">typename</span> iterator_adaptor_get_base<StepIterator>::type, StepIterator>;</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keyword">using</span> const_t = memory_based_2d_locator<typename const_iterator_type<StepIterator>::type>; <span class="comment">// same as this type, but over const values</span></div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> </div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> parent_t::coord_t;</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keyword">using</span> x_coord_t = <span class="keyword">typename</span> parent_t::x_coord_t;</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keyword">using</span> y_coord_t = <span class="keyword">typename</span> parent_t::y_coord_t;</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keyword">using</span> x_iterator = <span class="keyword">typename</span> parent_t::x_iterator;</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keyword">using</span> y_iterator = <span class="keyword">typename</span> parent_t::y_iterator;</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keyword">using</span> difference_type = <span class="keyword">typename</span> parent_t::difference_type;</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keyword">using</span> reference = <span class="keyword">typename</span> parent_t::reference;</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> Deref> <span class="keyword">struct </span>add_deref</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  {</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keyword">using</span> type = memory_based_2d_locator<typename iterator_add_deref<StepIterator,Deref>::type>;</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keyword">static</span> type make(<span class="keyword">const</span> memory_based_2d_locator<StepIterator>& loc, <span class="keyword">const</span> Deref& nderef) {</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">return</span> type(iterator_add_deref<StepIterator,Deref>::make(loc.y(),nderef));</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  }</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  };</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  memory_based_2d_locator() {}</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  memory_based_2d_locator(<span class="keyword">const</span> StepIterator& yit) : _p(yit) {}</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> SI> memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator<SI>& loc, coord_t y_step) : _p(loc.x(), loc.row_size()*y_step) {}</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> SI> memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator<SI>& loc, coord_t x_step, coord_t y_step, <span class="keywordtype">bool</span> transpose=<span class="keyword">false</span>)</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  : _p(make_step_iterator(loc.x(),(transpose ? loc.row_size() : loc.pixel_size())*x_step),</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  (transpose ? loc.pixel_size() : loc.row_size())*y_step ) {}</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  memory_based_2d_locator(x_iterator xit, std::ptrdiff_t row_bytes) : _p(xit,row_bytes) {}</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> X> memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator<X>& pl) : _p(pl._p) {}</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator& pl) : _p(pl._p) {}</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  memory_based_2d_locator& operator=(memory_based_2d_locator <span class="keyword">const</span>& other) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> this_t& p)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _p==p._p; }</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span> </div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  x_iterator <span class="keyword">const</span>& x()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _p.base(); }</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  y_iterator <span class="keyword">const</span>& y()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _p; }</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  x_iterator& x() { <span class="keywordflow">return</span> _p.base(); }</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  y_iterator& y() { <span class="keywordflow">return</span> _p; }</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="comment">// These are faster versions of functions already provided in the superclass</span></div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  x_iterator x_at (x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_advanced(x(), offset(dx,dy)); }</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  x_iterator x_at (<span class="keyword">const</span> difference_type& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_advanced(x(), offset(d.x,d.y)); }</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  this_t xy_at (x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> this_t(x_at( dx , dy ), row_size()); }</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  this_t xy_at (<span class="keyword">const</span> difference_type& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> this_t(x_at( d.x, d.y), row_size()); }</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  reference operator()(x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_advanced_ref(x(),offset(dx,dy)); }</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  reference operator[](<span class="keyword">const</span> difference_type& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_advanced_ref(x(),offset(d.x,d.y)); }</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  this_t& operator+=(<span class="keyword">const</span> difference_type& d) { memunit_advance(x(),offset(d.x,d.y)); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  this_t& operator-=(<span class="keyword">const</span> difference_type& d) { memunit_advance(x(),offset(-d.x,-d.y)); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> </div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="comment">// Memory-based locators can have 1D caching of 2D relative coordinates</span></div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keyword">using</span> cached_location_t = std::ptrdiff_t; <span class="comment">// type used to store relative location (to allow for more efficient repeated access)</span></div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  cached_location_t cache_location(<span class="keyword">const</span> difference_type& d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> offset(d.x,d.y); }</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  cached_location_t cache_location(x_coord_t dx, y_coord_t dy)<span class="keyword">const </span>{ <span class="keywordflow">return</span> offset(dx,dy); }</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  reference operator[](<span class="keyword">const</span> cached_location_t& loc)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_advanced_ref(x(),loc); }</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span> </div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="comment">// Only make sense for memory-based locators</span></div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  std::ptrdiff_t row_size()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_step(y()); } <span class="comment">// distance in mem units (bytes or bits) between adjacent rows</span></div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  std::ptrdiff_t pixel_size()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_step(x()); } <span class="comment">// distance in mem units (bytes or bits) between adjacent pixels on the same row</span></div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span> </div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordtype">bool</span> is_1d_traversable(x_coord_t width)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> row_size()-pixel_size()*width==0; } <span class="comment">// is there no gap at the end of each row?</span></div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="comment">// Returns the vertical distance (it2.y-it1.y) between two x_iterators given the difference of their x positions</span></div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  std::ptrdiff_t y_distance_to(this_t <span class="keyword">const</span>& p2, x_coord_t xDiff)<span class="keyword"> const</span></div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  std::ptrdiff_t rowDiff = memunit_distance(x(), p2.x()) - pixel_size() * xDiff;</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  BOOST_ASSERT((rowDiff % row_size()) == 0);</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">return</span> rowDiff / row_size();</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  }</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span> </div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> X> <span class="keyword">friend</span> <span class="keyword">class </span>memory_based_2d_locator;</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  std::ptrdiff_t offset(x_coord_t x, y_coord_t y)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> y*row_size() + x*pixel_size(); }</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  StepIterator _p;</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span> };</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> </div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="comment">// PixelBasedConcept</span></div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="comment"></span></div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SI></div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span> <span class="keyword">struct </span>color_space_type<memory_based_2d_locator<SI> > : <span class="keyword">public</span> color_space_type<typename memory_based_2d_locator<SI>::parent_t> {</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span> };</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span> </div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SI></div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="keyword">struct </span>channel_mapping_type<memory_based_2d_locator<SI> > : <span class="keyword">public</span> channel_mapping_type<typename memory_based_2d_locator<SI>::parent_t> {</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> };</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span> </div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SI></div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="keyword">struct </span>is_planar<memory_based_2d_locator<SI> > : <span class="keyword">public</span> is_planar<typename memory_based_2d_locator<SI>::parent_t> {</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span> };</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span> </div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SI></div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="keyword">struct </span>channel_type<memory_based_2d_locator<SI> > : <span class="keyword">public</span> channel_type<typename memory_based_2d_locator<SI>::parent_t> {</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span> };</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span> </div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="comment">// HasDynamicXStepTypeConcept</span></div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="comment"></span></div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment">// Take the base iterator of SI (which is typically a step iterator) and change it to have a step in x</span></div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SI></div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="keyword">struct </span>dynamic_x_step_type<memory_based_2d_locator<SI> > {</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="keyword">using</span> base_iterator_t = <span class="keyword">typename</span> iterator_adaptor_get_base<SI>::type;</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="keyword">using</span> base_iterator_step_t = <span class="keyword">typename</span> dynamic_x_step_type<base_iterator_t>::type;</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keyword">using</span> dynamic_step_base_t = <span class="keyword">typename</span> iterator_adaptor_rebind<SI, base_iterator_step_t>::type;</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keyword">using</span> type = memory_based_2d_locator<dynamic_step_base_t>;</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span> };</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span> </div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment">// HasDynamicYStepTypeConcept</span></div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"></span></div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SI></div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="keyword">struct </span>dynamic_y_step_type<memory_based_2d_locator<SI> > {</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keyword">using</span> type = memory_based_2d_locator<SI>;</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span> };</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span> } } <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span> </div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="classboost_1_1gil_1_1pixel__2d__locator__base_html"><div class="ttname"><a href="classboost_1_1gil_1_1pixel__2d__locator__base.html">boost::gil::pixel_2d_locator_base</a></div><div class="ttdoc">base class for models of PixelLocatorConceptPixel locator is similar to a pixel iterator,...</div><div class="ttdef"><b>Definition:</b> locator.hpp:109</div></div>
- <div class="ttc" id="structboost_1_1gil_1_1iterator__add__deref_html"><div class="ttname"><a href="structboost_1_1gil_1_1iterator__add__deref.html">boost::gil::iterator_add_deref</a></div><div class="ttdoc">Returns the type (and creates an instance) of an iterator that invokes the given dereference adaptor ...</div><div class="ttdef"><b>Definition:</b> locator.hpp:27</div></div>
- <div class="ttc" id="structboost_1_1gil_1_1transposed__type_html"><div class="ttname"><a href="structboost_1_1gil_1_1transposed__type.html">boost::gil::transposed_type</a></div><div class="ttdef"><b>Definition:</b> image_view_factory.hpp:40</div></div>
- <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>
- <div class="ttc" id="structboost_1_1gil_1_1num__channels_html"><div class="ttname"><a href="structboost_1_1gil_1_1num__channels.html">boost::gil::num_channels</a></div><div class="ttdoc">Returns the number of channels of a pixel-based GIL construct.</div><div class="ttdef"><b>Definition:</b> locator.hpp:38</div></div>
- <div class="ttc" id="classboost_1_1gil_1_1point_html"><div class="ttname"><a href="classboost_1_1gil_1_1point.html">boost::gil::point</a></div><div class="ttdoc">2D point both axes of which have the same dimension typeModels: Point2DConcept</div><div class="ttdef"><b>Definition:</b> locator.hpp:28</div></div>
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