Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/genericheap.h @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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1 // Copyright 2012 Google Inc. All Rights Reserved.
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2 // Author: rays@google.com (Ray Smith)
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3 ///////////////////////////////////////////////////////////////////////
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4 // File: genericheap.h
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5 // Description: Template heap class.
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6 // Author: Ray Smith, based on Dan Johnson's original code.
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7 //
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8 // (C) Copyright 2012, Google Inc.
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9 // Licensed under the Apache License, Version 2.0 (the "License");
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10 // you may not use this file except in compliance with the License.
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11 // You may obtain a copy of the License at
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12 // http://www.apache.org/licenses/LICENSE-2.0
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13 // Unless required by applicable law or agreed to in writing, software
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14 // distributed under the License is distributed on an "AS IS" BASIS,
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15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 // See the License for the specific language governing permissions and
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17 // limitations under the License.
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18 //
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19 ///////////////////////////////////////////////////////////////////////
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20
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21 #ifndef TESSERACT_CCUTIL_GENERICHEAP_H_
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22 #define TESSERACT_CCUTIL_GENERICHEAP_H_
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24 #include "errcode.h"
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26 #include <vector>
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28 namespace tesseract {
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29
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30 // GenericHeap requires 1 template argument:
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31 // Pair will normally be either KDPairInc<Key, Data> or KDPairDec<Key, Data>
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32 // for some arbitrary Key and scalar, smart pointer, or non-ownership pointer
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33 // Data type, according to whether a MIN heap or a MAX heap is desired,
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34 // respectively. Using KDPtrPairInc<Key, Data> or KDPtrPairDec<Key, Data>,
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35 // GenericHeap can also handle simple Data pointers and own them.
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36 // If no additional data is required, Pair can also be a scalar, since
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37 // GenericHeap doesn't look inside it except for operator<.
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38 //
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39 // The heap is stored as a packed binary tree in an array hosted by a
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40 // vector<Pair>, with the invariant that the children of each node are
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41 // both NOT Pair::operator< the parent node. KDPairInc defines Pair::operator<
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42 // to use Key::operator< to generate a MIN heap and KDPairDec defines
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43 // Pair::operator< to use Key::operator> to generate a MAX heap by reversing
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44 // all the comparisons.
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45 // See http://en.wikipedia.org/wiki/Heap_(data_structure) for more detail on
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46 // the basic heap implementation.
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47 //
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48 // Insertion and removal are both O(log n) and, unlike the STL heap, an
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49 // explicit Reshuffle function allows a node to be repositioned in time O(log n)
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50 // after changing its value.
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51 //
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52 // Accessing the element for revaluation is a more complex matter, since the
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53 // index and pointer can be changed arbitrarily by heap operations.
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54 // Revaluation can be done by making the Data type in the Pair derived from or
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55 // contain a DoublePtr as its first data element, making it possible to convert
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56 // the pointer to a Pair using KDPairInc::RecastDataPointer.
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57 template <typename Pair>
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58 class GenericHeap {
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59 public:
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60 GenericHeap() = default;
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61 // The initial size is only a vector::reserve. It is not enforced as
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62 // the size limit of the heap. Caller must implement their own enforcement.
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63 explicit GenericHeap(int initial_size) {
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64 heap_.reserve(initial_size);
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65 }
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66
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67 // Simple accessors.
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68 bool empty() const {
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69 return heap_.empty();
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70 }
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71 int size() const {
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72 return heap_.size();
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73 }
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74 int size_reserved() const {
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75 return heap_.size_reserved();
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76 }
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77 void clear() {
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78 // Clear truncates to 0 to keep the number reserved in tact.
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79 heap_.clear();
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80 }
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81 // Provides access to the underlying vector.
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82 // Caution! any changes that modify the keys will invalidate the heap!
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83 std::vector<Pair> &heap() {
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84 return heap_;
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85 }
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86 // Provides read-only access to an element of the underlying vector.
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87 const Pair &get(int index) const {
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88 return heap_[index];
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89 }
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90
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91 // Add entry to the heap, keeping the smallest item at the top, by operator<.
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92 // Note that *entry is used as the source of operator=, but it is non-const
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93 // to allow for a smart pointer to be contained within.
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94 // Time = O(log n).
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95 void Push(Pair *entry) {
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96 int hole_index = heap_.size();
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97 // Make a hole in the end of heap_ and sift it up to be the correct
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98 // location for the new *entry. To avoid needing a default constructor
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99 // for primitive types, and to allow for use of DoublePtr in the Pair
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100 // somewhere, we have to incur a double copy here.
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101 heap_.push_back(*entry);
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102 *entry = heap_.back();
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103 hole_index = SiftUp(hole_index, *entry);
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104 heap_[hole_index] = *entry;
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105 }
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106
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107 // Get the value of the top (smallest, defined by operator< ) element.
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108 const Pair &PeekTop() const {
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109 return heap_[0];
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110 }
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111 // Get the value of the worst (largest, defined by operator< ) element.
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112 const Pair &PeekWorst() const {
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113 return heap_[IndexOfWorst()];
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114 }
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115
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116 // Removes the top element of the heap. If entry is not nullptr, the element
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117 // is copied into *entry, otherwise it is discarded.
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118 // Returns false if the heap was already empty.
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119 // Time = O(log n).
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120 bool Pop(Pair *entry) {
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121 int new_size = heap_.size() - 1;
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122 if (new_size < 0) {
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123 return false; // Already empty.
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124 }
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125 if (entry != nullptr) {
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126 *entry = heap_[0];
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127 }
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128 if (new_size > 0) {
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129 // Sift the hole at the start of the heap_ downwards to match the last
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130 // element.
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131 Pair hole_pair = heap_[new_size];
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132 heap_.resize(new_size);
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133 int hole_index = SiftDown(0, hole_pair);
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134 heap_[hole_index] = std::move(hole_pair);
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135 } else {
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136 heap_.resize(new_size);
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137 }
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138 return true;
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139 }
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140
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141 // Removes the MAXIMUM element of the heap. (MIN from a MAX heap.) If entry is
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142 // not nullptr, the element is copied into *entry, otherwise it is discarded.
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143 // Time = O(n). Returns false if the heap was already empty.
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144 bool PopWorst(Pair *entry) {
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145 int worst_index = IndexOfWorst();
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146 if (worst_index < 0) {
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147 return false; // It cannot be empty!
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148 }
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149 // Extract the worst element from the heap, leaving a hole at worst_index.
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150 if (entry != nullptr) {
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151 *entry = heap_[worst_index];
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152 }
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153 int heap_size = heap_.size() - 1;
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154 if (heap_size > 0) {
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155 // Sift the hole upwards to match the last element of the heap_
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156 Pair hole_pair = heap_[heap_size];
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157 int hole_index = SiftUp(worst_index, hole_pair);
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158 heap_[hole_index] = hole_pair;
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159 }
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diff changeset
160 heap_.resize(heap_size);
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161 return true;
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162 }
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163
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164 // Returns the index of the worst element. Time = O(n/2).
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165 int IndexOfWorst() const {
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166 int heap_size = heap_.size();
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167 if (heap_size == 0) {
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168 return -1; // It cannot be empty!
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169 }
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170
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171 // Find the maximum element. Its index is guaranteed to be greater than
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172 // the index of the parent of the last element, since by the heap invariant
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173 // the parent must be less than or equal to the children.
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diff changeset
174 int worst_index = heap_size - 1;
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diff changeset
175 int end_parent = ParentNode(worst_index);
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diff changeset
176 for (int i = worst_index - 1; i > end_parent; --i) {
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diff changeset
177 if (heap_[worst_index] < heap_[i]) {
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diff changeset
178 worst_index = i;
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179 }
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180 }
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diff changeset
181 return worst_index;
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182 }
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183
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diff changeset
184 // The pointed-to Pair has changed its key value, so the location of pair
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parents:
diff changeset
185 // is reshuffled to maintain the heap invariant.
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parents:
diff changeset
186 // Must be a valid pointer to an element of the heap_!
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parents:
diff changeset
187 // Caution! Since GenericHeap is based on vector, reallocs may occur
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parents:
diff changeset
188 // whenever the vector is extended and elements may get shuffled by any
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parents:
diff changeset
189 // Push or Pop operation. Therefore use this function only if Data in Pair is
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diff changeset
190 // of type DoublePtr, derived (first) from DoublePtr, or has a DoublePtr as
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parents:
diff changeset
191 // its first element. Reshuffles the heap to maintain the invariant.
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parents:
diff changeset
192 // Time = O(log n).
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parents:
diff changeset
193 void Reshuffle(Pair *pair) {
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parents:
diff changeset
194 int index = pair - &heap_[0];
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parents:
diff changeset
195 Pair hole_pair = heap_[index];
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parents:
diff changeset
196 index = SiftDown(index, hole_pair);
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parents:
diff changeset
197 index = SiftUp(index, hole_pair);
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parents:
diff changeset
198 heap_[index] = std::move(hole_pair);
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199 }
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200
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201 private:
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202 // A hole in the heap exists at hole_index, and we want to fill it with the
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203 // given pair. SiftUp sifts the hole upward to the correct position and
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204 // returns the destination index without actually putting pair there.
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205 int SiftUp(int hole_index, const Pair &pair) {
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206 int parent;
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207 while (hole_index > 0 && pair < heap_[parent = ParentNode(hole_index)]) {
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208 heap_[hole_index] = heap_[parent];
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209 hole_index = parent;
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210 }
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211 return hole_index;
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212 }
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213
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214 // A hole in the heap exists at hole_index, and we want to fill it with the
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215 // given pair. SiftDown sifts the hole downward to the correct position and
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216 // returns the destination index without actually putting pair there.
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217 int SiftDown(int hole_index, const Pair &pair) {
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218 int heap_size = heap_.size();
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219 int child;
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220 while ((child = LeftChild(hole_index)) < heap_size) {
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221 if (child + 1 < heap_size && heap_[child + 1] < heap_[child]) {
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222 ++child;
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223 }
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224 if (heap_[child] < pair) {
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225 heap_[hole_index] = heap_[child];
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226 hole_index = child;
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227 } else {
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228 break;
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229 }
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230 }
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231 return hole_index;
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232 }
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233
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234 // Functions to navigate the tree. Unlike the original implementation, we
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235 // store the root at index 0.
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236 int ParentNode(int index) const {
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237 return (index + 1) / 2 - 1;
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238 }
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239 int LeftChild(int index) const {
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240 return index * 2 + 1;
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241 }
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242
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243 private:
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244 std::vector<Pair> heap_;
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245 };
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246
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247 } // namespace tesseract
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248
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249 #endif // TESSERACT_CCUTIL_GENERICHEAP_H_