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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 2019 Olzhas Zhumabek <anonymous.from.applecity@gmail.com></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">// Use, modification and distribution are subject to the Boost Software License,</span></div><div class="line"><a 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 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_IMAGE_PROCESSING_SCALING_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_SCALING_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/image_view.hpp></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/rgb.hpp></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <boost/gil/pixel.hpp></span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <boost/gil/image_processing/numeric.hpp></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">template</span> <<span class="keyword">typename</span> ImageView></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keywordtype">void</span> lanczos_at(</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  ImageView input_view,</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  ImageView output_view,</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">typename</span> ImageView::x_coord_t source_x,</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">typename</span> ImageView::y_coord_t source_y,</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">typename</span> ImageView::x_coord_t target_x,</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keyword">typename</span> ImageView::y_coord_t target_y,</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  std::ptrdiff_t 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> x_coord_t = <span class="keyword">typename</span> ImageView::x_coord_t;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">using</span> y_coord_t = <span class="keyword">typename</span> ImageView::y_coord_t;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">using</span> pixel_t = <span class="keyword">typename</span> std::remove_reference<decltype(std::declval<ImageView>()(0, 0))>::type;</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// C++11 doesn't allow auto in lambdas</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">using</span> channel_t = <span class="keyword">typename</span> std::remove_reference</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  decltype(std::declval<pixel_t>().at(std::integral_constant<int, 0>{}))</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  >::type;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  pixel_t result_pixel;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  static_transform(result_pixel, result_pixel, [](channel_t) {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> static_cast<channel_t>(0);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  });</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">auto</span> x_zero = static_cast<x_coord_t>(0);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">auto</span> x_one = static_cast<x_coord_t>(1);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keyword">auto</span> y_zero = static_cast<y_coord_t>(0);</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">auto</span> y_one = static_cast<y_coord_t>(1);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">for</span> (y_coord_t y_i = (std::max)(source_y - static_cast<y_coord_t>(a) + y_one, y_zero);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  y_i <= (std::min)(source_y + static_cast<y_coord_t>(a), input_view.height() - y_one);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  ++y_i)</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  {</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">for</span> (x_coord_t x_i = (std::max)(source_x - static_cast<x_coord_t>(a) + x_one, x_zero);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  x_i <= (std::min)(source_x + static_cast<x_coord_t>(a), input_view.width() - x_one);</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  ++x_i)</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  {</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">double</span> lanczos_response = <a class="code" href="group___image_processing_math.html#gaaa4583e6d012a8b49ad1738cec762651">lanczos</a>(source_x - x_i, a) * <a class="code" href="group___image_processing_math.html#gaaa4583e6d012a8b49ad1738cec762651">lanczos</a>(source_y - y_i, a);</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">auto</span> op = [lanczos_response](channel_t prev, channel_t next)</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  {</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> static_cast<channel_t>(prev + next * lanczos_response);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  };</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  static_transform(result_pixel, input_view(source_x, source_y), result_pixel, op);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  output_view(target_x, target_y) = result_pixel;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> }</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="keyword">template</span> <<span class="keyword">typename</span> ImageView></div><div class="line"><a name="l00095"></a><span class="lineno"><a class="line" href="group___down_scaling_algorithms.html#ga272263cc79c9aa4ecb26687c15f2edf5"> 95</a></span> <span class="keywordtype">void</span> <a class="code" href="group___down_scaling_algorithms.html#ga272263cc79c9aa4ecb26687c15f2edf5">scale_lanczos</a>(ImageView input_view, ImageView output_view, std::ptrdiff_t a)</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> {</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">double</span> scale_x = (static_cast<double>(output_view.width()))</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  / static_cast<double>(input_view.width());</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordtype">double</span> scale_y = (static_cast<double>(output_view.height()))</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  / static_cast<double>(input_view.height());</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">using</span> x_coord_t = <span class="keyword">typename</span> ImageView::x_coord_t;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keyword">using</span> y_coord_t = <span class="keyword">typename</span> ImageView::y_coord_t;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">for</span> (y_coord_t y = 0; y < output_view.height(); ++y)</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  {</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">for</span> (x_coord_t x = 0; x < output_view.width(); ++x)</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>  lanczos_at(input_view, output_view, x / scale_x, y / scale_y, x, y, a);</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</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> }</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> }} <span class="comment">// namespace boost::gil</span></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="preprocessor">#endif</span></div><div class="ttc" id="group___down_scaling_algorithms_html_ga272263cc79c9aa4ecb26687c15f2edf5"><div class="ttname"><a href="group___down_scaling_algorithms.html#ga272263cc79c9aa4ecb26687c15f2edf5">boost::gil::scale_lanczos</a></div><div class="ttdeci">void scale_lanczos(ImageView input_view, ImageView output_view, std::ptrdiff_t a)</div><div class="ttdoc">Complete Lanczos algorithmThis algorithm does full pass over resulting image and convolves pixels fro...</div><div class="ttdef"><b>Definition:</b> scaling.hpp:95</div></div>
- <div class="ttc" id="group___image_processing_math_html_gaaa4583e6d012a8b49ad1738cec762651"><div class="ttname"><a href="group___image_processing_math.html#gaaa4583e6d012a8b49ad1738cec762651">boost::gil::lanczos</a></div><div class="ttdeci">double lanczos(double x, std::ptrdiff_t a)</div><div class="ttdoc">Lanczos response at point xLanczos response is defined as: x == 0: 1 -a < x && x < a: 0 otherwise: no...</div><div class="ttdef"><b>Definition:</b> numeric.hpp:45</div></div>
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