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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_ITERATOR_FROM_2D_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_ITERATOR_FROM_2D_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/concepts.hpp&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;boost/gil/locator.hpp&gt;</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;boost/gil/pixel_iterator.hpp&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;boost/gil/point.hpp&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;boost/assert.hpp&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;boost/iterator/iterator_facade.hpp&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<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>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</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> Loc2&gt;    <span class="comment">// Models PixelLocatorConcept</span></div><div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1iterator__from__2d.html">   42</a></span>&#160;<span class="keyword">class </span><a class="code" href="classboost_1_1gil_1_1iterator__from__2d.html">iterator_from_2d</a> : <span class="keyword">public</span> iterator_facade&lt;iterator_from_2d&lt;Loc2&gt;,</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;                                                typename Loc2::value_type,</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;                                                std::random_access_iterator_tag,</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;                                                typename Loc2::reference,</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;                                                typename Loc2::coord_t&gt; {</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    GIL_CLASS_REQUIRE(Loc2, boost::gil, <a class="code" href="structboost_1_1gil_1_1_pixel_locator_concept.html">PixelLocatorConcept</a>)</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keyword">using</span> parent_t = iterator_facade&lt;iterator_from_2d&lt;Loc2&gt;,</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;                            <span class="keyword">typename</span> Loc2::value_type,</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;                            std::random_access_iterator_tag,</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;                            <span class="keyword">typename</span> Loc2::reference,</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;                            <span class="keyword">typename</span> Loc2::coord_t&gt;;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    <span class="keyword">using</span> reference = <span class="keyword">typename</span> parent_t::reference;</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    <span class="keyword">using</span> difference_type = <span class="keyword">typename</span> parent_t::difference_type;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="keyword">using</span> x_iterator = <span class="keyword">typename</span> Loc2::x_iterator;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="keyword">using</span> point_t = <span class="keyword">typename</span> Loc2::point_t;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    std::ptrdiff_t width()<span class="keyword">         const </span>{ <span class="keywordflow">return</span> _width; }            <span class="comment">// number of pixels per image row</span></div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    std::ptrdiff_t x_pos()<span class="keyword">         const </span>{ <span class="keywordflow">return</span> _coords.x; }         <span class="comment">// current x position</span></div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    std::ptrdiff_t y_pos()<span class="keyword">         const </span>{ <span class="keywordflow">return</span> _coords.y; }         <span class="comment">// current y position</span></div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div><div class="line"><a name="l00065"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1iterator__from__2d.html#a16d8e6857dd561244ca73764f2b94801">   65</a></span>&#160;    reference <a class="code" href="classboost_1_1gil_1_1iterator__from__2d.html#a16d8e6857dd561244ca73764f2b94801">operator[]</a>(difference_type d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *(*<span class="keyword">this</span>+d); }</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;    <span class="keywordtype">bool</span>            is_1d_traversable()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _p.is_1d_traversable(width()); }   <span class="comment">// is there no gap at the end of each row?</span></div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    x_iterator&amp;     x()                   { <span class="keywordflow">return</span> _p.x(); }</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    iterator_from_2d() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    iterator_from_2d(<span class="keyword">const</span> Loc2&amp; p, std::ptrdiff_t width, std::ptrdiff_t x=0, std::ptrdiff_t y=0) : _coords(x,y), _width(width), _p(p) {}</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    iterator_from_2d(<span class="keyword">const</span> iterator_from_2d&amp; pit) : _coords(pit._coords), _width(pit._width), _p(pit._p) {}</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> Loc&gt; iterator_from_2d(<span class="keyword">const</span> iterator_from_2d&lt;Loc&gt;&amp; pit) : _coords(pit._coords), _width(pit._width), _p(pit._p) {}</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    iterator_from_2d&amp; operator=(iterator_from_2d <span class="keyword">const</span>&amp; other) = <span class="keywordflow">default</span>;</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="keyword">private</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> Loc&gt; <span class="keyword">friend</span> <span class="keyword">class </span>iterator_from_2d;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <span class="keyword">friend</span> <span class="keyword">class </span>boost::iterator_core_access;</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    reference dereference()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *_p; }</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    <span class="keywordtype">void</span> increment() {</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        ++_coords.x;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        ++_p.x();</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;        <span class="keywordflow">if</span> (_coords.x&gt;=_width) {</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;            _coords.x=0;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;            ++_coords.y;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;            _p+=point_t(-_width,1);</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        }</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;    <span class="keywordtype">void</span> decrement() {</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;        --_coords.x;</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        --_p.x();</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;        <span class="keywordflow">if</span> (_coords.x&lt;0) {</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;            _coords.x=_width-1;</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;            --_coords.y;</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;            _p+=point_t(_width,-1);</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        }</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    }</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;    BOOST_FORCEINLINE <span class="keywordtype">void</span> advance(difference_type d) {</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;        <span class="keywordflow">if</span> (_width==0) <span class="keywordflow">return</span>;  <span class="comment">// unfortunately we need to check for that. Default-constructed images have width of 0 and the code below will throw if executed.</span></div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        point_t delta;</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        <span class="keywordflow">if</span> (_coords.x+d&gt;=0) {  <span class="comment">// not going back to a previous row?</span></div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;            delta.x=(_coords.x+(std::ptrdiff_t)d)%_width - _coords.x;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;            delta.y=(_coords.x+(std::ptrdiff_t)d)/_width;</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;        } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;            delta.x=(_coords.x+(std::ptrdiff_t)d*(1-_width))%_width -_coords.x;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;            delta.y=-(_width-_coords.x-(std::ptrdiff_t)d-1)/_width;</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        }</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;        _p+=delta;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        _coords.x+=delta.x;</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        _coords.y+=delta.y;</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;</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    difference_type distance_to(<span class="keyword">const</span> iterator_from_2d&amp; it)<span class="keyword"> const </span>{</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;        <span class="keywordflow">if</span> (_width==0) <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        <span class="keywordflow">return</span> (it.y_pos()-_coords.y)*_width + (it.x_pos()-_coords.x);</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    }</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    <span class="keywordtype">bool</span> <a class="code" href="group___s_t_l_optimizations.html#ga2902a23650ef266e80874ce5df076079">equal</a>(iterator_from_2d <span class="keyword">const</span>&amp; it)<span class="keyword"> const</span></div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="keyword">    </span>{</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        BOOST_ASSERT(_width == it.width()); <span class="comment">// they must belong to the same image</span></div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;        <span class="keywordflow">return</span> _coords == it._coords &amp;&amp; _p == it._p;</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    }</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    point_t _coords;</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    std::ptrdiff_t _width;</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    Loc2 _p;</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;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span></div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;<span class="keyword">struct </span>const_iterator_type&lt;iterator_from_2d&lt;Loc&gt; &gt; {</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    <span class="keyword">using</span> type = iterator_from_2d&lt;typename Loc::const_t&gt;;</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;};</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span></div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="keyword">struct </span>iterator_is_mutable&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> iterator_is_mutable&lt;typename Loc::x_iterator&gt; {};</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;<span class="comment">//  HasDynamicXStepTypeConcept</span></div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt;</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="keyword">struct </span>dynamic_x_step_type&lt;iterator_from_2d&lt;Loc&gt; &gt; {</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    <span class="keyword">using</span> type = iterator_from_2d&lt;typename dynamic_x_step_type&lt;Loc&gt;::type&gt;;</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;};</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="l00150"></a><span class="lineno">  150</span>&#160;<span class="comment">//  PixelBasedConcept</span></div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span></div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="keyword">struct </span>color_space_type&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> color_space_type&lt;Loc&gt; {};</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span></div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="keyword">struct </span>channel_mapping_type&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> channel_mapping_type&lt;Loc&gt; {};</div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span></div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;<span class="keyword">struct </span>is_planar&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> is_planar&lt;Loc&gt; {};</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span></div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;<span class="keyword">struct </span>channel_type&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> channel_type&lt;Loc&gt; {};</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;} }  <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;</div><div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="classboost_1_1gil_1_1iterator__from__2d_html"><div class="ttname"><a href="classboost_1_1gil_1_1iterator__from__2d.html">boost::gil::iterator_from_2d</a></div><div class="ttdoc">Provides 1D random-access navigation to the pixels of the image. Models: PixelIteratorConcept,...</div><div class="ttdef"><b>Definition:</b> iterator_from_2d.hpp:42</div></div>
  51 <div class="ttc" id="classboost_1_1gil_1_1iterator__from__2d_html_a16d8e6857dd561244ca73764f2b94801"><div class="ttname"><a href="classboost_1_1gil_1_1iterator__from__2d.html#a16d8e6857dd561244ca73764f2b94801">boost::gil::iterator_from_2d::operator[]</a></div><div class="ttdeci">reference operator[](difference_type d) const</div><div class="ttdef"><b>Definition:</b> iterator_from_2d.hpp:65</div></div>
  52 <div class="ttc" id="structboost_1_1gil_1_1_pixel_locator_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1_pixel_locator_concept.html">boost::gil::PixelLocatorConcept</a></div><div class="ttdoc">GIL's 2-dimensional locator over immutable GIL pixels.</div><div class="ttdef"><b>Definition:</b> pixel_locator.hpp:290</div></div>
  53 <div class="ttc" id="group___s_t_l_optimizations_html_ga2902a23650ef266e80874ce5df076079"><div class="ttname"><a href="group___s_t_l_optimizations.html#ga2902a23650ef266e80874ce5df076079">std::equal</a></div><div class="ttdeci">BOOST_FORCEINLINE bool equal(boost::gil::iterator_from_2d&lt; Loc1 &gt; first, boost::gil::iterator_from_2d&lt; Loc1 &gt; last, boost::gil::iterator_from_2d&lt; Loc2 &gt; first2)</div><div class="ttdoc">std::equal(I1,I1,I2) with I1 and I2 being a iterator_from_2d</div><div class="ttdef"><b>Definition:</b> algorithm.hpp:1029</div></div>
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