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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">//</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// Copyright 2020 Debabrata Mandal &lt;mandaldebabrata123@gmail.com&gt;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">//</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment">// Use, modification and distribution are subject to the Boost Software License,</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">//</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_ADAPTIVE_HISTOGRAM_EQUALIZATION_HPP</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_ADAPTIVE_HISTOGRAM_EQUALIZATION_HPP</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include &lt;boost/gil/algorithm.hpp&gt;</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include &lt;boost/gil/histogram.hpp&gt;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include &lt;boost/gil/image.hpp&gt;</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#include &lt;boost/gil/image_processing/histogram_equalization.hpp&gt;</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include &lt;boost/gil/image_view_factory.hpp&gt;</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include &lt;cmath&gt;</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include &lt;map&gt;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcHist&gt;</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="keywordtype">double</span> actual_clip_limit(SrcHist <span class="keyword">const</span>&amp; src_hist, <span class="keywordtype">double</span> cliplimit = 0.03)</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span>{</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordtype">double</span> epsilon = 1.0;</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keyword">using </span>value_t = <span class="keyword">typename</span> SrcHist::value_type;</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keywordtype">double</span> sum = src_hist.sum();</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> std::size_t num_bins = src_hist.size();</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> cliplimit = sum * cliplimit;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keywordtype">long</span> low = 0, high = cliplimit, middle = low;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordflow">while</span> (high - low &gt;= 1)</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> {</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> middle = (low + high + 1) &gt;&gt; 1;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordtype">long</span> excess = 0;</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> std::for_each(src_hist.begin(), src_hist.end(), [&amp;](value_t <span class="keyword">const</span>&amp; v) {</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> if (v.second &gt; middle)</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> excess += v.second - middle;</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> });</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">if</span> (std::abs(excess - (cliplimit - middle) * num_bins) &lt; epsilon)</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (excess &gt; (cliplimit - middle) * num_bins)</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> high = middle - 1;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> low = middle + 1;</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> }</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordflow">return</span> middle / sum;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span>}</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcHist, <span class="keyword">typename</span> DstHist&gt;</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><span class="keywordtype">void</span> clip_and_redistribute(SrcHist <span class="keyword">const</span>&amp; src_hist, DstHist&amp; dst_hist, <span class="keywordtype">double</span> clip_limit = 0.03)</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span>{</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keyword">using </span>value_t = <span class="keyword">typename</span> SrcHist::value_type;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordtype">double</span> sum = src_hist.sum();</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="keywordtype">double</span> actual_clip_value = detail::actual_clip_limit(src_hist, clip_limit);</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="comment">// double actual_clip_value = clip_limit;</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordtype">long</span> actual_clip_limit = actual_clip_value * sum;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordtype">double</span> excess = 0;</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> std::for_each(src_hist.begin(), src_hist.end(), [&amp;](value_t <span class="keyword">const</span>&amp; v) {</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> if (v.second &gt; actual_clip_limit)</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> excess += v.second - actual_clip_limit;</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> });</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> std::for_each(src_hist.begin(), src_hist.end(), [&amp;](value_t <span class="keyword">const</span>&amp; v) {</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> if (v.second &gt;= actual_clip_limit)</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> dst_hist[dst_hist.key_from_tuple(v.first)] = clip_limit * sum;</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> else</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> dst_hist[dst_hist.key_from_tuple(v.first)] = v.second + excess / src_hist.size();</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> });</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="keywordtype">long</span> rem = long(excess) % src_hist.size();</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="keywordflow">if</span> (rem == 0)</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keywordtype">long</span> period = round(src_hist.size() / rem);</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> std::size_t index = 0;</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="keywordflow">while</span> (rem)</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> {</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> <span class="keywordflow">if</span> (dst_hist(index) &gt;= clip_limit * sum)</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> {</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> index = (index + 1) % src_hist.size();</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> }</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> dst_hist(index)++;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> rem--;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> index = (index + period) % src_hist.size();</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> }</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span>}</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> </div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView&gt;</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span><span class="keywordtype">void</span> non_overlapping_interpolated_clahe(</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> SrcView <span class="keyword">const</span>&amp; src_view,</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> DstView <span class="keyword">const</span>&amp; dst_view,</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> std::ptrdiff_t tile_width_x = 20,</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> std::ptrdiff_t tile_width_y = 20,</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="keywordtype">double</span> clip_limit = 0.03,</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> std::size_t bin_width = 1.0,</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> <span class="keywordtype">bool</span> mask = <span class="keyword">false</span>,</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> std::vector&lt;std::vector&lt;bool&gt;&gt; src_mask = {})</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span>{</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> gil_function_requires&lt;ImageViewConcept&lt;SrcView&gt;&gt;();</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> gil_function_requires&lt;MutableImageViewConcept&lt;DstView&gt;&gt;();</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="keyword">static_assert</span>(</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> color_spaces_are_compatible&lt;</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="keyword">typename</span> color_space_type&lt;SrcView&gt;::type,</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="keyword">typename</span> color_space_type&lt;DstView&gt;::type&gt;::value,</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="stringliteral">&quot;Source and destination views must have same color space&quot;</span>);</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="keyword">using </span>source_channel_t = <span class="keyword">typename</span> channel_type&lt;SrcView&gt;::type;</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <span class="keyword">using </span>dst_channel_t = <span class="keyword">typename</span> channel_type&lt;DstView&gt;::type;</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="keyword">using </span>coord_t = <span class="keyword">typename</span> SrcView::x_coord_t;</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> std::size_t <span class="keyword">const</span> channels = num_channels&lt;SrcView&gt;::value;</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> coord_t <span class="keyword">const</span> width = src_view.width();</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> coord_t <span class="keyword">const</span> height = src_view.height();</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> <span class="comment">// Find control points</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> </div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> std::vector&lt;coord_t&gt; sample_x;</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> coord_t sample_x1 = tile_width_x / 2;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> coord_t sample_y1 = tile_width_y / 2;</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> </div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> <span class="keyword">auto</span> extend_left = tile_width_x;</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> <span class="keyword">auto</span> extend_top = tile_width_y;</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> <span class="keyword">auto</span> extend_right = (tile_width_x - width % tile_width_x) % tile_width_x + tile_width_x;</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> <span class="keyword">auto</span> extend_bottom = (tile_width_y - height % tile_width_y) % tile_width_y + tile_width_y;</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> </div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> <span class="keyword">auto</span> new_width = width + extend_left + extend_right;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="keyword">auto</span> new_height = height + extend_top + extend_bottom;</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> </div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> image&lt;typename SrcView::value_type&gt; padded_img(new_width, new_height);</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> <span class="keyword">auto</span> top_left_x = tile_width_x;</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> <span class="keyword">auto</span> top_left_y = tile_width_y;</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> <span class="keyword">auto</span> bottom_right_x = tile_width_x + width;</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <span class="keyword">auto</span> bottom_right_y = tile_width_y + height;</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <a class="code hl_function" href="group___image_view_s_t_l_algorithms_copy_pixels.html#ga0dff2d4420556f79de0b5a108378ff03">copy_pixels</a>(src_view, subimage_view(<a class="code hl_function" href="group___image_model.html#ga11e52868409ba2d52a93213ee39f4fde">view</a>(padded_img), top_left_x, top_left_y, width, height));</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> </div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="keywordflow">for</span> (std::size_t k = 0; k &lt; channels; k++)</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> {</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> std::vector&lt;histogram&lt;source_channel_t&gt;&gt; prev_row(new_width / tile_width_x),</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> next_row((new_width / tile_width_x));</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> std::vector&lt;std::map&lt;source_channel_t, source_channel_t&gt;&gt; prev_map(</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> new_width / tile_width_x),</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> next_map((new_width / tile_width_x));</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> </div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> coord_t prev = 0, next = 1;</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> <span class="keyword">auto</span> channel_view = nth_channel_view(<a class="code hl_function" href="group___image_model.html#ga11e52868409ba2d52a93213ee39f4fde">view</a>(padded_img), k);</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> <span class="keywordflow">for</span> (std::ptrdiff_t i = top_left_y; i &lt; bottom_right_y; ++i)</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> {</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> <span class="keywordflow">if</span> ((i - sample_y1) / tile_width_y &gt;= next || i == top_left_y)</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> {</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> <span class="keywordflow">if</span> (i != top_left_y)</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> {</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> prev = next;</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> next++;</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> }</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> prev_row = next_row;</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> prev_map = next_map;</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <span class="keywordflow">for</span> (std::ptrdiff_t j = sample_x1; j &lt; new_width; j += tile_width_x)</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> {</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> <span class="keyword">auto</span> img_view = subimage_view(</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> channel_view, j - sample_x1, next * tile_width_y,</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span> std::max&lt;int&gt;(</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span> std::min&lt;int&gt;(tile_width_x + j - sample_x1, bottom_right_x) -</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span> (j - sample_x1),</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span> 0),</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> std::max&lt;int&gt;(</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span> std::min&lt;int&gt;((next + 1) * tile_width_y, bottom_right_y) -</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span> next * tile_width_y,</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> 0));</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span> fill_histogram(</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span> img_view, next_row[(j - sample_x1) / tile_width_x], bin_width, <span class="keyword">false</span>,</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span> <span class="keyword">false</span>);</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span> </div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span> detail::clip_and_redistribute(</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span> next_row[(j - sample_x1) / tile_width_x],</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span> next_row[(j - sample_x1) / tile_width_x], clip_limit);</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> </div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span> next_map[(j - sample_x1) / tile_width_x] =</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span> histogram_equalization(next_row[(j - sample_x1) / tile_width_x]);</div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span> }</div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span> }</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span> <span class="keywordtype">bool</span> prev_row_mask = 1, next_row_mask = 1;</div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span> <span class="keywordflow">if</span> (prev == 0)</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span> prev_row_mask = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (next + 1 == new_height / tile_width_y)</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span> next_row_mask = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span> <span class="keywordflow">for</span> (std::ptrdiff_t j = top_left_x; j &lt; bottom_right_x; ++j)</div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span> {</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span> <span class="keywordtype">bool</span> prev_col_mask = <span class="keyword">true</span>, next_col_mask = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span> <span class="keywordflow">if</span> ((j - sample_x1) / tile_width_x == 0)</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span> prev_col_mask = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((j - sample_x1) / tile_width_x + 1 == new_width / tile_width_x - 1)</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span> next_col_mask = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span> </div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span> <span class="comment">// Bilinear interpolation</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span> point_t top_left(</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span> (j - sample_x1) / tile_width_x * tile_width_x + sample_x1,</div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span> prev * tile_width_y + sample_y1);</div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span> point_t top_right(top_left.x + tile_width_x, top_left.y);</div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span> point_t bottom_left(top_left.x, top_left.y + tile_width_y);</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span> point_t bottom_right(top_left.x + tile_width_x, top_left.y + tile_width_y);</div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"> 254</span> </div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno"> 255</span> <span class="keywordtype">long</span> <span class="keywordtype">double</span> x_diff = top_right.x - top_left.x;</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno"> 256</span> <span class="keywordtype">long</span> <span class="keywordtype">double</span> y_diff = bottom_left.y - top_left.y;</div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno"> 257</span> </div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"> 258</span> <span class="keywordtype">long</span> <span class="keywordtype">double</span> x1 = (j - top_left.x) / x_diff;</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span> <span class="keywordtype">long</span> <span class="keywordtype">double</span> x2 = (top_right.x - j) / x_diff;</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span> <span class="keywordtype">long</span> <span class="keywordtype">double</span> y1 = (i - top_left.y) / y_diff;</div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span> <span class="keywordtype">long</span> <span class="keywordtype">double</span> y2 = (bottom_left.y - i) / y_diff;</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span> </div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span> <span class="keywordflow">if</span> (prev_row_mask == 0)</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span> y1 = 1;</div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"> 265</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (next_row_mask == 0)</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span> y2 = 1;</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span> <span class="keywordflow">if</span> (prev_col_mask == 0)</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span> x1 = 1;</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (next_col_mask == 0)</div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span> x2 = 1;</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span> </div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span> <span class="keywordtype">long</span> <span class="keywordtype">double</span> numerator =</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span> ((prev_row_mask &amp; prev_col_mask) * x2 *</div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span> prev_map[(top_left.x - sample_x1) / tile_width_x][channel_view(j, i)] +</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span> (prev_row_mask &amp; next_col_mask) * x1 *</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span> prev_map[(top_right.x - sample_x1) / tile_width_x][channel_view(j, i)]) *</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span> y2 +</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span> ((next_row_mask &amp; prev_col_mask) * x2 *</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span> next_map[(bottom_left.x - sample_x1) / tile_width_x][channel_view(j, i)] +</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span> (next_row_mask &amp; next_col_mask) * x1 *</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span> next_map[(bottom_right.x - sample_x1) / tile_width_x][channel_view(j, i)]) *</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span> y1;</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span> </div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span> <span class="keywordflow">if</span> (mask &amp;&amp; !src_mask[i - top_left_y][j - top_left_x])</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span> {</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span> dst_view(j - top_left_x, i - top_left_y) =</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span> channel_convert&lt;dst_channel_t&gt;(</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span> <span class="keyword">static_cast&lt;</span>source_channel_t<span class="keyword">&gt;</span>(channel_view(i, j)));</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span> }</div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span> {</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span> dst_view(j - top_left_x, i - top_left_y) =</div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span> channel_convert&lt;dst_channel_t&gt;(<span class="keyword">static_cast&lt;</span>source_channel_t<span class="keyword">&gt;</span>(numerator));</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span> }</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span> }</div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span> }</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"> 297</span> }</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span>}</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span> </div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span>}} <span class="comment">//namespace boost::gil</span></div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span> </div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span><span class="preprocessor">#endif</span></div>
<div class="ttc" id="agroup___image_model_html_ga11e52868409ba2d52a93213ee39f4fde"><div class="ttname"><a href="group___image_model.html#ga11e52868409ba2d52a93213ee39f4fde">boost::gil::view</a></div><div class="ttdeci">auto view(image&lt; Pixel, IsPlanar, Alloc &gt; &amp;img) -&gt; typename image&lt; Pixel, IsPlanar, Alloc &gt;::view_t const &amp;</div><div class="ttdoc">Returns the non-constant-pixel view of an image.</div><div class="ttdef"><b>Definition</b> image.hpp:565</div></div>
<div class="ttc" id="agroup___image_view_s_t_l_algorithms_copy_pixels_html_ga0dff2d4420556f79de0b5a108378ff03"><div class="ttname"><a href="group___image_view_s_t_l_algorithms_copy_pixels.html#ga0dff2d4420556f79de0b5a108378ff03">boost::gil::copy_pixels</a></div><div class="ttdeci">BOOST_FORCEINLINE void copy_pixels(const View1 &amp;src, const View2 &amp;dst)</div><div class="ttdoc">std::copy for image views</div><div class="ttdef"><b>Definition</b> algorithm.hpp:292</div></div>
<div class="ttc" id="anamespaceboost_html"><div class="ttname"><a href="namespaceboost.html">boost</a></div><div class="ttdoc">defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)</div><div class="ttdef"><b>Definition</b> algorithm.hpp:36</div></div>
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