Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/sorthelper.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: sorthelper.h
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3 // Description: Generic sort and maxfinding class.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2010, Google Inc.
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 //
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17 ///////////////////////////////////////////////////////////////////////
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18
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19 #ifndef TESSERACT_CCUTIL_SORTHELPER_H_
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20 #define TESSERACT_CCUTIL_SORTHELPER_H_
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21
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22 #include <cstdlib>
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23 #include <vector>
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25 namespace tesseract {
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27 // Generic class to provide functions based on a <value,count> pair.
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28 // T is the value type.
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29 // The class keeps a count of each value and can return the most frequent
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30 // value or a sorted array of the values with counts.
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31 // Note that this class uses linear search for adding. It is better
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32 // to use the STATS class to get the mode of a large number of values
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33 // in a small space. SortHelper is better to get the mode of a small number
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34 // of values from a large space.
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35 // T must have a copy constructor.
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36 template <typename T>
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37 class SortHelper {
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38 public:
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39 // Simple pair class to hold the values and counts.
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40 template <typename PairT>
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41 struct SortPair {
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42 PairT value;
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43 int count;
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44 };
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45 // qsort function to sort by decreasing count.
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46 static int SortPairsByCount(const void *v1, const void *v2) {
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47 const auto *p1 = static_cast<const SortPair<T> *>(v1);
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48 const auto *p2 = static_cast<const SortPair<T> *>(v2);
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49 return p2->count - p1->count;
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50 }
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51 // qsort function to sort by decreasing value.
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52 static int SortPairsByValue(const void *v1, const void *v2) {
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53 const auto *p1 = static_cast<const SortPair<T> *>(v1);
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54 const auto *p2 = static_cast<const SortPair<T> *>(v2);
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55 if (p2->value - p1->value < 0) {
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56 return -1;
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57 }
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58 if (p2->value - p1->value > 0) {
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59 return 1;
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60 }
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61 return 0;
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62 }
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63
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64 // Constructor takes a hint of the array size, but it need not be accurate.
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65 explicit SortHelper(int sizehint) {
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66 counts_.reserve(sizehint);
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67 }
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68
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69 // Add a value that may be a duplicate of an existing value.
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70 // Uses a linear search.
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71 void Add(T value, int count) {
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72 // Linear search for value.
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73 for (auto &it : counts_) {
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74 if (it.value == value) {
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75 it.count += count;
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76 return;
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77 }
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78 }
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79 SortPair<T> new_pair = {value, count};
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80 counts_.push_back(SortPair<T>(new_pair));
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81 }
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82
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83 // Returns the frequency of the most frequent value.
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84 // If max_value is not nullptr, returns the most frequent value.
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85 // If the array is empty, returns -INT32_MAX and max_value is unchanged.
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86 int MaxCount(T *max_value) const {
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87 int best_count = -INT32_MAX;
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88 for (auto &it : counts_) {
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89 if (it.count > best_count) {
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90 best_count = it.count;
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91 if (max_value != nullptr) {
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92 *max_value = it.value;
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93 }
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94 }
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95 }
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96 return best_count;
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97 }
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98
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99 // Returns the data array sorted by decreasing frequency.
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100 const std::vector<SortPair<T>> &SortByCount() {
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101 counts_.sort(&SortPairsByCount);
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102 return counts_;
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103 }
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104 // Returns the data array sorted by decreasing value.
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105 const std::vector<SortPair<T>> &SortByValue() {
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106 counts_.sort(&SortPairsByValue);
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107 return counts_;
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108 }
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109
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110 private:
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111 std::vector<SortPair<T>> counts_;
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112 };
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113
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114 } // namespace tesseract
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115
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116 #endif // TESSERACT_CCUTIL_SORTHELPER_H_.