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<div class="title">helpers.h</div> </div>
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<a href="a00014.html">Go to the documentation of this file.</a><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"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * File: helpers.h</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Description: General utility functions</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * Author: Daria Antonova</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * (c) Copyright 2009, Google Inc.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> ** Licensed under the Apache License, Version 2.0 (the "License");</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> ** you may not use this file except in compliance with the License.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> ** You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> ** http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> ** Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> ** distributed under the License is distributed on an "AS IS" BASIS,</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> ** See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> ** limitations under the License.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> *****************************************************************************/</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef TESSERACT_CCUTIL_HELPERS_H_</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define TESSERACT_CCUTIL_HELPERS_H_</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <cassert></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <cstdio></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <cstring></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <functional></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <string></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// TODO(rays) Put the rest of the helpers in the namespace.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">namespace </span><a class="code" href="a01818.html">tesseract</a> {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// A simple linear congruential random number generator, using Knuth's</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// constants from:</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// http://en.wikipedia.org/wiki/Linear_congruential_generator.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">class </span>TRand {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <a class="code" href="a02450.html#a5d303ee5ede21e6b2286a3f011e16c0b">TRand</a>() = <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="comment">// Sets the seed to the given value.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordtype">void</span> <a class="code" href="a02450.html#ace83848435d2c9289a7fff0fb938c4f7">set_seed</a>(uint64_t seed) {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  seed_ = seed;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  }</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// Sets the seed using a hash of a string.</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordtype">void</span> <a class="code" href="a02450.html#ace83848435d2c9289a7fff0fb938c4f7">set_seed</a>(<span class="keyword">const</span> <a class="code" href="a01622.html#aca454f84dd198a937af6499dd758aa3d">std::string</a>& str) {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  std::hash<std::string> hasher;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <a class="code" href="a02450.html#ace83848435d2c9289a7fff0fb938c4f7">set_seed</a>(static_cast<uint64_t>(hasher(str)));</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// Returns an integer in the range 0 to INT32_MAX.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  int32_t <a class="code" href="a02450.html#a821ab9cea24381cfb980b3ec92a2c1eb">IntRand</a>() {</div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="a02450.html"> 50</a></span>  Iterate();</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> seed_ >> 33;</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>  <span class="comment">// Returns a floating point value in the range [-range, range].</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">double</span> <a class="code" href="a02450.html#a7e05f43d116ea2c6f83435924937b0c9">SignedRand</a>(<span class="keywordtype">double</span> range) {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">return</span> range * 2.0 * <a class="code" href="a02450.html#a821ab9cea24381cfb980b3ec92a2c1eb">IntRand</a>() / INT32_MAX - range;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  }</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// Returns a floating point value in the range [0, range].</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">double</span> <a class="code" href="a02450.html#a9fea4670b76b953afc288eba5e1be653">UnsignedRand</a>(<span class="keywordtype">double</span> range) {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> range * <a class="code" href="a02450.html#a821ab9cea24381cfb980b3ec92a2c1eb">IntRand</a>() / INT32_MAX;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  }</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  </div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// Steps the generator to the next value.</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordtype">void</span> Iterate() {</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  seed_ *= 6364136223846793005ULL;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  seed_ += 1442695040888963407ULL;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</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="comment">// The current value of the seed.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"><a class="line" href="a02450.html#ace83848435d2c9289a7fff0fb938c4f7"> 70</a></span>  uint64_t seed_{1};</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> };</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="comment">// namespace tesseract</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="a02450.html#a21888d792d9655efba519ad772b169d3"> 74</a></span>  </div>
<div class="line"><a name="l00075"></a><span class="lineno"><a class="line" href="a00014.html#a31bec0ef73dd383e256fa462e9fa7e1f"> 75</a></span> <span class="comment">// Remove newline (if any) at the end of the string.</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a31bec0ef73dd383e256fa462e9fa7e1f">chomp_string</a>(<span class="keywordtype">char</span>* str) {</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordtype">int</span> last_index = static_cast<int>(strlen(str)) - 1;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">while</span> (last_index >= 0 &&</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  (str[last_index] == <span class="charliteral">'\n'</span> || str[last_index] == <span class="charliteral">'\r'</span>)) {</div>
<div class="line"><a name="l00080"></a><span class="lineno"><a class="line" href="a02450.html#a821ab9cea24381cfb980b3ec92a2c1eb"> 80</a></span>  str[last_index--] = <span class="charliteral">'\0'</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> }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
<div class="line"><a name="l00084"></a><span class="lineno"><a class="line" href="a00014.html#a2ddd0a4cdfa269201be6c7716ae94b0a"> 84</a></span> <span class="comment">// Advance the current pointer of the file if it points to a newline character.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="a02450.html#a7e05f43d116ea2c6f83435924937b0c9"> 85</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a2ddd0a4cdfa269201be6c7716ae94b0a">SkipNewline</a>(FILE* <a class="code" href="a04138.html">file</a>) {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span> (fgetc(<a class="code" href="a04138.html">file</a>) != <span class="charliteral">'\n'</span>) {</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  fseek(<a class="code" href="a04138.html">file</a>, -1, SEEK_CUR);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="line" href="a02450.html#a9fea4670b76b953afc288eba5e1be653"> 89</a></span> }</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// Swaps the two args pointed to by the pointers.</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// Operator= and copy constructor must work on T.</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"><a class="line" href="a00014.html#ae8b7e3bea137bea50dc1ceb158ddf0ac"> 93</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#ae8b7e3bea137bea50dc1ceb158ddf0ac">Swap</a>(T* p1, T* p2) {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  T tmp(*p2);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  *p2 = *p1;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  *p1 = tmp;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> }</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
<div class="line"><a name="l00100"></a><span class="lineno"><a class="line" href="a00014.html#aea2e31b49321ab46ca2ec6fa510cc975"> 100</a></span> <span class="comment">// return the smallest multiple of block_size greater than or equal to n.</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="a00014.html#aea2e31b49321ab46ca2ec6fa510cc975">RoundUp</a>(<span class="keywordtype">int</span> n, <span class="keywordtype">int</span> block_size) {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> block_size * ((n + block_size - 1) / block_size);</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> }</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment">// Clip a numeric value to the interval [lower_bound, upper_bound].</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="a00014.html#af8739168d5b3235996eeb25dac3c4044"> 106</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="keyword">inline</span> T <a class="code" href="a00014.html#af8739168d5b3235996eeb25dac3c4044">ClipToRange</a>(<span class="keyword">const</span> T& x, <span class="keyword">const</span> T& lower_bound, <span class="keyword">const</span> T& upper_bound) {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">if</span> (x < lower_bound) {</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> lower_bound;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  }</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> (x > upper_bound) {</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> upper_bound;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">return</span> x;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> }</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment">// Extend the range [lower_bound, upper_bound] to include x.</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"><a class="line" href="a00014.html#a6eb00eb9bc5ed195953f334971c462ae"> 118</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a6eb00eb9bc5ed195953f334971c462ae">UpdateRange</a>(<span class="keyword">const</span> <a class="code" href="a01766.html#a99fb83031ce9923c84392b4e92f956b5a623238751deb7764bdebf4799fe30f07">T1</a>& x, <a class="code" href="a01766.html#a99fb83031ce9923c84392b4e92f956b5aa1dc19c9c7fb4dadda340448ab60c3b5">T2</a>* lower_bound, <a class="code" href="a01766.html#a99fb83031ce9923c84392b4e92f956b5aa1dc19c9c7fb4dadda340448ab60c3b5">T2</a>* upper_bound) {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">if</span> (x < *lower_bound) {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  *lower_bound = x;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  }</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">if</span> (x > *upper_bound) {</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  *upper_bound = x;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment">// Decrease lower_bound to be <= x_lo AND increase upper_bound to be >= x_hi.</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="a00014.html#a525da2725ab47c5dad3f5b8e00fd49dd"> 129</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a6eb00eb9bc5ed195953f334971c462ae">UpdateRange</a>(<span class="keyword">const</span> <a class="code" href="a01766.html#a99fb83031ce9923c84392b4e92f956b5a623238751deb7764bdebf4799fe30f07">T1</a>& x_lo, <span class="keyword">const</span> <a class="code" href="a01766.html#a99fb83031ce9923c84392b4e92f956b5a623238751deb7764bdebf4799fe30f07">T1</a>& x_hi, <a class="code" href="a01766.html#a99fb83031ce9923c84392b4e92f956b5aa1dc19c9c7fb4dadda340448ab60c3b5">T2</a>* lower_bound,</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <a class="code" href="a01766.html#a99fb83031ce9923c84392b4e92f956b5aa1dc19c9c7fb4dadda340448ab60c3b5">T2</a>* upper_bound) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">if</span> (x_lo < *lower_bound) {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  *lower_bound = x_lo;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">if</span> (x_hi > *upper_bound) {</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  *upper_bound = x_hi;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment">// Intersect the range [*lower2, *upper2] with the range [lower1, upper1],</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment">// putting the result back in [*lower2, *upper2].</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment">// If non-intersecting ranges are given, we end up with *lower2 > *upper2.</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"><a class="line" href="a00014.html#a6a6e013c7a0b4afa87f5e37697f7f99f"> 143</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a6a6e013c7a0b4afa87f5e37697f7f99f">IntersectRange</a>(<span class="keyword">const</span> T& lower1, <span class="keyword">const</span> T& upper1, T* lower2,</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  T* upper2) {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">if</span> (lower1 > *lower2) {</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  *lower2 = lower1;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">if</span> (upper1 < *upper2) {</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  *upper2 = upper1;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  }</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> }</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  </div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment">// Proper modulo arithmetic operator. Returns a mod b that works for -ve a.</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment">// For any integer a and positive b, returns r : 0<=r<b and a=n*b + r for</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"><a class="line" href="a00014.html#a560c3ba94fe224dd67b10bd4cb5a6886"> 156</a></span> <span class="comment">// some integer n.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="a00014.html#a560c3ba94fe224dd67b10bd4cb5a6886">Modulo</a>(<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> b) {</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">return</span> (a % b + b) % b;</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> }</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  </div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment">// Integer division operator with rounding that works for negative input.</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment">// Returns a divided by b, rounded to the nearest integer, without double</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment">// counting at 0. With simple rounding 1/3 = 0, 0/3 = 0 -1/3 = 0, -2/3 = 0,</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment">// -3/3 = 0 and -4/3 = -1.</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"><a class="line" href="a00014.html#a29e9efc11d2c7cdfa4c30881e82999dc"> 165</a></span> <span class="comment">// I want 1/3 = 0, 0/3 = 0, -1/3 = 0, -2/3 = -1, -3/3 = -1 and -4/3 = -1.</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="a00014.html#a29e9efc11d2c7cdfa4c30881e82999dc">DivRounded</a>(<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> b) {</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">if</span> (b < 0) {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordflow">return</span> -<a class="code" href="a00014.html#a29e9efc11d2c7cdfa4c30881e82999dc">DivRounded</a>(a, -b);</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  }</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">return</span> a >= 0 ? (a + b / 2) / b : (a - b / 2) / b;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> }</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  </div>
<div class="line"><a name="l00173"></a><span class="lineno"><a class="line" href="a00014.html#ab60e4f82956a1f5fdb54d0d8303e95b7"> 173</a></span> <span class="comment">// Return a double cast to int with rounding.</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="a00014.html#ab60e4f82956a1f5fdb54d0d8303e95b7">IntCastRounded</a>(<span class="keywordtype">double</span> x) {</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">return</span> x >= 0.0 ? static_cast<int>(x + 0.5) : -static_cast<int>(-x + 0.5);</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> }</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  </div>
<div class="line"><a name="l00178"></a><span class="lineno"><a class="line" href="a00014.html#aab81cd3de9e656460ff4aaa1fbbc4fee"> 178</a></span> <span class="comment">// Return a float cast to int with rounding.</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="a00014.html#ab60e4f82956a1f5fdb54d0d8303e95b7">IntCastRounded</a>(<span class="keywordtype">float</span> x) {</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">return</span> x >= 0.0F ? static_cast<int>(x + 0.5F) : -static_cast<int>(-x + 0.5F);</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> }</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  </div>
<div class="line"><a name="l00183"></a><span class="lineno"><a class="line" href="a00014.html#ae7eeeca49954d4b13d269729f2fecd5a"> 183</a></span> <span class="comment">// Reverse the order of bytes in a n byte quantity for big/little-endian switch.</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#ae7eeeca49954d4b13d269729f2fecd5a">ReverseN</a>(<span class="keywordtype">void</span>* ptr, <span class="keywordtype">int</span> num_bytes) {</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  assert(num_bytes == 1 || num_bytes == 2 || num_bytes == 4 || num_bytes == 8);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordtype">char</span>* cptr = static_cast<char*>(ptr);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordtype">int</span> halfsize = num_bytes / 2;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < halfsize; ++i) {</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordtype">char</span> tmp = cptr[i];</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  cptr[i] = cptr[num_bytes - 1 - i];</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  cptr[num_bytes - 1 - i] = tmp;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  }</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> }</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  </div>
<div class="line"><a name="l00195"></a><span class="lineno"><a class="line" href="a00014.html#a3c77aeb5931af9236d1d7fdecf7129be"> 195</a></span> <span class="comment">// Reverse the order of bytes in a 16 bit quantity for big/little-endian switch.</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a3c77aeb5931af9236d1d7fdecf7129be">Reverse16</a>(<span class="keywordtype">void</span>* ptr) {</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <a class="code" href="a00014.html#ae7eeeca49954d4b13d269729f2fecd5a">ReverseN</a>(ptr, 2);</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> }</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  </div>
<div class="line"><a name="l00200"></a><span class="lineno"><a class="line" href="a00014.html#a7bb3b6a97c833fe8630a7b129917b985"> 200</a></span> <span class="comment">// Reverse the order of bytes in a 32 bit quantity for big/little-endian switch.</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a7bb3b6a97c833fe8630a7b129917b985">Reverse32</a>(<span class="keywordtype">void</span>* ptr) {</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <a class="code" href="a00014.html#ae7eeeca49954d4b13d269729f2fecd5a">ReverseN</a>(ptr, 4);</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> }</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  </div>
<div class="line"><a name="l00205"></a><span class="lineno"><a class="line" href="a00014.html#a19ab4c9ee8967ade8c255c2d11061c80"> 205</a></span> <span class="comment">// Reverse the order of bytes in a 64 bit quantity for big/little-endian switch.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a00014.html#a19ab4c9ee8967ade8c255c2d11061c80">Reverse64</a>(<span class="keywordtype">void</span>* ptr) {</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <a class="code" href="a00014.html#ae7eeeca49954d4b13d269729f2fecd5a">ReverseN</a>(ptr, 8);</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> }</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  </div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="preprocessor">#endif // TESSERACT_CCUTIL_HELPERS_H_</span></div>
</div><!-- fragment --></div><!-- contents -->
</div><!-- doc-content -->
<div class="ttc" id="aa01622_html_aca454f84dd198a937af6499dd758aa3d"><div class="ttname"><a href="a01622.html#aca454f84dd198a937af6499dd758aa3d">string</a></div><div class="ttdeci">std::string string</div><div class="ttdef"><b>Definition:</b> <a href="a01622_source.html#l00021">equationdetect_test.cc:21</a></div></div>
<div class="ttc" id="aa00014_html_af8739168d5b3235996eeb25dac3c4044"><div class="ttname"><a href="a00014.html#af8739168d5b3235996eeb25dac3c4044">ClipToRange</a></div><div class="ttdeci">T ClipToRange(const T &x, const T &lower_bound, const T &upper_bound)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00106">helpers.h:106</a></div></div>
<div class="ttc" id="aa01766_html_a99fb83031ce9923c84392b4e92f956b5a623238751deb7764bdebf4799fe30f07"><div class="ttname"><a href="a01766.html#a99fb83031ce9923c84392b4e92f956b5a623238751deb7764bdebf4799fe30f07">T1</a></div><div class="ttdef"><b>Definition:</b> <a href="a01766_source.html#l00028">rune.c:28</a></div></div>
<div class="ttc" id="aa00014_html_a7bb3b6a97c833fe8630a7b129917b985"><div class="ttname"><a href="a00014.html#a7bb3b6a97c833fe8630a7b129917b985">Reverse32</a></div><div class="ttdeci">void Reverse32(void *ptr)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00200">helpers.h:200</a></div></div>
<div class="ttc" id="aa00014_html_a6a6e013c7a0b4afa87f5e37697f7f99f"><div class="ttname"><a href="a00014.html#a6a6e013c7a0b4afa87f5e37697f7f99f">IntersectRange</a></div><div class="ttdeci">void IntersectRange(const T &lower1, const T &upper1, T *lower2, T *upper2)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00143">helpers.h:143</a></div></div>
<div class="ttc" id="aa02450_html_a821ab9cea24381cfb980b3ec92a2c1eb"><div class="ttname"><a href="a02450.html#a821ab9cea24381cfb980b3ec92a2c1eb">tesseract::TRand::IntRand</a></div><div class="ttdeci">int32_t IntRand()</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00080">helpers.h:80</a></div></div>
<div class="ttc" id="aa00014_html_aea2e31b49321ab46ca2ec6fa510cc975"><div class="ttname"><a href="a00014.html#aea2e31b49321ab46ca2ec6fa510cc975">RoundUp</a></div><div class="ttdeci">int RoundUp(int n, int block_size)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00100">helpers.h:100</a></div></div>
<div class="ttc" id="aa00014_html_ab60e4f82956a1f5fdb54d0d8303e95b7"><div class="ttname"><a href="a00014.html#ab60e4f82956a1f5fdb54d0d8303e95b7">IntCastRounded</a></div><div class="ttdeci">int IntCastRounded(double x)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00173">helpers.h:173</a></div></div>
<div class="ttc" id="aa04138_html"><div class="ttname"><a href="a04138.html">file</a></div><div class="ttdef"><b>Definition:</b> <a href="a01637_source.html#l00022">include_gunit.h:22</a></div></div>
<div class="ttc" id="aa00014_html_a31bec0ef73dd383e256fa462e9fa7e1f"><div class="ttname"><a href="a00014.html#a31bec0ef73dd383e256fa462e9fa7e1f">chomp_string</a></div><div class="ttdeci">void chomp_string(char *str)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00075">helpers.h:75</a></div></div>
<div class="ttc" id="aa00014_html_a2ddd0a4cdfa269201be6c7716ae94b0a"><div class="ttname"><a href="a00014.html#a2ddd0a4cdfa269201be6c7716ae94b0a">SkipNewline</a></div><div class="ttdeci">void SkipNewline(FILE *file)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00084">helpers.h:84</a></div></div>
<div class="ttc" id="aa02450_html_a5d303ee5ede21e6b2286a3f011e16c0b"><div class="ttname"><a href="a02450.html#a5d303ee5ede21e6b2286a3f011e16c0b">tesseract::TRand::TRand</a></div><div class="ttdeci">TRand()=default</div></div>
<div class="ttc" id="aa01818_html"><div class="ttname"><a href="a01818.html">tesseract</a></div><div class="ttdef"><b>Definition:</b> <a href="a00005_source.html#l00065">baseapi.h:65</a></div></div>
<div class="ttc" id="aa00014_html_a29e9efc11d2c7cdfa4c30881e82999dc"><div class="ttname"><a href="a00014.html#a29e9efc11d2c7cdfa4c30881e82999dc">DivRounded</a></div><div class="ttdeci">int DivRounded(int a, int b)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00165">helpers.h:165</a></div></div>
<div class="ttc" id="aa01766_html_a99fb83031ce9923c84392b4e92f956b5aa1dc19c9c7fb4dadda340448ab60c3b5"><div class="ttname"><a href="a01766.html#a99fb83031ce9923c84392b4e92f956b5aa1dc19c9c7fb4dadda340448ab60c3b5">T2</a></div><div class="ttdef"><b>Definition:</b> <a href="a01766_source.html#l00030">rune.c:30</a></div></div>
<div class="ttc" id="aa02450_html_a7e05f43d116ea2c6f83435924937b0c9"><div class="ttname"><a href="a02450.html#a7e05f43d116ea2c6f83435924937b0c9">tesseract::TRand::SignedRand</a></div><div class="ttdeci">double SignedRand(double range)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00085">helpers.h:85</a></div></div>
<div class="ttc" id="aa02450_html_ace83848435d2c9289a7fff0fb938c4f7"><div class="ttname"><a href="a02450.html#ace83848435d2c9289a7fff0fb938c4f7">tesseract::TRand::set_seed</a></div><div class="ttdeci">void set_seed(uint64_t seed)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00070">helpers.h:70</a></div></div>
<div class="ttc" id="aa00014_html_a3c77aeb5931af9236d1d7fdecf7129be"><div class="ttname"><a href="a00014.html#a3c77aeb5931af9236d1d7fdecf7129be">Reverse16</a></div><div class="ttdeci">void Reverse16(void *ptr)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00195">helpers.h:195</a></div></div>
<div class="ttc" id="aa02450_html_a9fea4670b76b953afc288eba5e1be653"><div class="ttname"><a href="a02450.html#a9fea4670b76b953afc288eba5e1be653">tesseract::TRand::UnsignedRand</a></div><div class="ttdeci">double UnsignedRand(double range)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00089">helpers.h:89</a></div></div>
<div class="ttc" id="aa00014_html_a560c3ba94fe224dd67b10bd4cb5a6886"><div class="ttname"><a href="a00014.html#a560c3ba94fe224dd67b10bd4cb5a6886">Modulo</a></div><div class="ttdeci">int Modulo(int a, int b)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00156">helpers.h:156</a></div></div>
<div class="ttc" id="aa00014_html_ae8b7e3bea137bea50dc1ceb158ddf0ac"><div class="ttname"><a href="a00014.html#ae8b7e3bea137bea50dc1ceb158ddf0ac">Swap</a></div><div class="ttdeci">void Swap(T *p1, T *p2)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00093">helpers.h:93</a></div></div>
<div class="ttc" id="aa00014_html_ae7eeeca49954d4b13d269729f2fecd5a"><div class="ttname"><a href="a00014.html#ae7eeeca49954d4b13d269729f2fecd5a">ReverseN</a></div><div class="ttdeci">void ReverseN(void *ptr, int num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00183">helpers.h:183</a></div></div>
<div class="ttc" id="aa00014_html_a6eb00eb9bc5ed195953f334971c462ae"><div class="ttname"><a href="a00014.html#a6eb00eb9bc5ed195953f334971c462ae">UpdateRange</a></div><div class="ttdeci">void UpdateRange(const T1 &x, T2 *lower_bound, T2 *upper_bound)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00118">helpers.h:118</a></div></div>
<div class="ttc" id="aa00014_html_a19ab4c9ee8967ade8c255c2d11061c80"><div class="ttname"><a href="a00014.html#a19ab4c9ee8967ade8c255c2d11061c80">Reverse64</a></div><div class="ttdeci">void Reverse64(void *ptr)</div><div class="ttdef"><b>Definition:</b> <a href="a00014_source.html#l00205">helpers.h:205</a></div></div>
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