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<div class="title">row_buffer_helper.hpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright 2007-2008 Christian Henning</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div>
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<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>
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<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>
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<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>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#ifndef BOOST_GIL_IO_ROW_BUFFER_HELPER_HPP</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BOOST_GIL_IO_ROW_BUFFER_HELPER_HPP</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// TODO: Shall we move toolbox to core?</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/extension/toolbox/metafunctions/is_bit_aligned.hpp></span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <boost/gil/extension/toolbox/metafunctions/is_homogeneous.hpp></span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <boost/gil/extension/toolbox/metafunctions/pixel_bit_size.hpp></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <boost/gil/detail/mp11.hpp></span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <boost/gil/io/typedefs.hpp></span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <cstddef></span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <type_traits></span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <vector></span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">namespace </span><a class="code" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil { <span class="keyword">namespace </span>detail {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">template</span>< <span class="keyword">typename</span> Pixel</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  , <span class="keyword">typename</span> DummyT = <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  ></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">struct </span>row_buffer_helper</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> {</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keyword">using</span> element_t = Pixel;</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keyword">using</span> buffer_t = std::vector<element_t>;</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">using</span> iterator_t = <span class="keyword">typename</span> buffer_t::iterator;</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  row_buffer_helper( std::size_t width</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  , <span class="keywordtype">bool</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  )</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  : _row_buffer( width )</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  {}</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  element_t* data() { <span class="keywordflow">return</span> &_row_buffer[0]; }</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  </div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  iterator_t begin() { <span class="keywordflow">return</span> _row_buffer.begin(); }</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  iterator_t end() { <span class="keywordflow">return</span> _row_buffer.end(); }</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  buffer_t& buffer() { <span class="keywordflow">return</span> _row_buffer; }</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  buffer_t _row_buffer;</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> };</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Pixel></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keyword">struct </span>row_buffer_helper</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  Pixel,</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  typename std::enable_if</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  is_bit_aligned<Pixel>::value</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  >::type</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> ></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> {</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keyword">using</span> element_t = byte_t;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">using</span> buffer_t = std::vector<element_t>;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">using</span> pixel_type = Pixel;</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">using</span> iterator_t = bit_aligned_pixel_iterator<pixel_type>;</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  row_buffer_helper(std::size_t width, <span class="keywordtype">bool</span> in_bytes)</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  : _c{( width * pixel_bit_size< pixel_type >::value) >> 3}</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  , _r{width * pixel_bit_size< pixel_type >::value - (_c << 3)}</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">if</span> (in_bytes)</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  {</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  _row_buffer.resize(width);</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  }</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  {</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// add one byte if there are remaining bits</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  _row_buffer.resize(_c + (_r != 0));</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  </div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  element_t* data() { <span class="keywordflow">return</span> &_row_buffer[0]; }</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  iterator_t begin() { <span class="keywordflow">return</span> iterator_t( &_row_buffer.front(),0 ); }</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  iterator_t end() { <span class="keywordflow">return</span> _r == 0 ? iterator_t( &_row_buffer.back() + 1, 0 )</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  : iterator_t( &_row_buffer.back() , (int) _r );</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  </div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  buffer_t& buffer() { <span class="keywordflow">return</span> _row_buffer; }</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  </div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// For instance 25 pixels of rgb2 type would be:</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// overall 25 pixels * 3 channels * 2 bits/channel = 150 bits</span></div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// c = 18 bytes</span></div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// r = 6 bits</span></div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  std::size_t _c; <span class="comment">// number of full bytes</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  std::size_t _r; <span class="comment">// number of remaining bits</span></div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  buffer_t _row_buffer;</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> };</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="keyword">template</span><<span class="keyword">typename</span> Pixel></div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="keyword">struct </span>row_buffer_helper</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  Pixel,</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  typename std::enable_if</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  mp11::mp_and</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  typename is_bit_aligned<Pixel>::type,</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  typename is_homogeneous<Pixel>::type</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  >::value</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  ></div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> ></div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> {</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">using</span> element_t = byte_t;</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">using</span> buffer_t = std::vector<element_t>;</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">using</span> pixel_type = Pixel;</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">using</span> iterator_t = bit_aligned_pixel_iterator<pixel_type>;</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  </div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  row_buffer_helper( std::size_t width</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  , <span class="keywordtype">bool</span> in_bytes</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  )</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  : _c( ( width</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  * num_channels< pixel_type >::value</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  * channel_type< pixel_type >::type::num_bits</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  )</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  >> 3</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  )</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  </div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  , _r( width</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  * num_channels< pixel_type >::value</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  * channel_type< pixel_type >::type::num_bits</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  - ( _c << 3 )</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  )</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  {</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">if</span>( in_bytes )</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  {</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  _row_buffer.resize( width );</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  {</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">// add one byte if there are remaining bits</span></div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  _row_buffer.resize( _c + ( _r!=0 ));</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  element_t* data() { <span class="keywordflow">return</span> &_row_buffer[0]; }</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  </div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  iterator_t begin() { <span class="keywordflow">return</span> iterator_t( &_row_buffer.front(),0 ); }</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  iterator_t end() { <span class="keywordflow">return</span> _r == 0 ? iterator_t( &_row_buffer.back() + 1, 0 )</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  : iterator_t( &_row_buffer.back() , (int) _r );</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  }</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  </div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  buffer_t& buffer() { <span class="keywordflow">return</span> _row_buffer; }</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  </div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">// For instance 25 pixels of rgb2 type would be:</span></div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">// overall 25 pixels * 3 channels * 2 bits/channel = 150 bits</span></div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="comment">// c = 18 bytes</span></div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">// r = 6 bits</span></div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  std::size_t _c; <span class="comment">// number of full bytes</span></div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  std::size_t _r; <span class="comment">// number of remaining bits</span></div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  </div>
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  buffer_t _row_buffer;</div>
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> };</div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  </div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="keyword">template</span> <<span class="keyword">typename</span> View, <span class="keyword">typename</span> D = <span class="keywordtype">void</span>></div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="keyword">struct </span>row_buffer_helper_view : row_buffer_helper<typename View::value_type></div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> {</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  row_buffer_helper_view(std::size_t width, <span class="keywordtype">bool</span> in_bytes)</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  : row_buffer_helper<typename View::value_type>(width, in_bytes)</div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  {}</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> };</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  </div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="keyword">template</span> <<span class="keyword">typename</span> View></div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="keyword">struct </span>row_buffer_helper_view</div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  View,</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  typename std::enable_if</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  is_bit_aligned<typename View::value_type>::value</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  >::type</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> > : row_buffer_helper<typename View::reference></div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> {</div>
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  row_buffer_helper_view(std::size_t width, <span class="keywordtype">bool</span> in_bytes)</div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  : row_buffer_helper<typename View::reference>(width, in_bytes)</div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  {}</div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> };</div>
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<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  </div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> } <span class="comment">// namespace detail</span></div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> } <span class="comment">// namespace gil</span></div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> } <span class="comment">// namespace boost</span></div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  </div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="preprocessor">#endif</span></div>
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<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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