Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/indexmapbidi.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: indexmapbidi.h
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3 // Description: Bi-directional mapping between a sparse and compact space.
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4 // Author: rays@google.com (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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19 #ifndef TESSERACT_CCUTIL_INDEXMAPBIDI_H_
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20 #define TESSERACT_CCUTIL_INDEXMAPBIDI_H_
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22 #include <tesseract/export.h> // for TESS_API
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24 #include <cstdint> // for int32_t
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25 #include <cstdio>
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26 #include <vector>
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28 namespace tesseract {
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30 class IndexMapBiDi;
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32 // Bidirectional one-to-one mapping between a sparse and a compact discrete
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33 // space. Many entries in the sparse space are unmapped, but those that are
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34 // mapped have a 1-1 mapping to (and from) the compact space, where all
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35 // values are used. This is useful for forming subsets of larger collections,
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36 // such as subsets of character sets, or subsets of binary feature spaces.
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37 //
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38 // This base class provides basic functionality with binary search for the
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39 // SparseToCompact mapping to save memory.
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40 // For a faster inverse mapping, or to allow a many-to-one mapping, use
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41 // IndexMapBiDi below.
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42 // NOTE: there are currently no methods to setup an IndexMap on its own!
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43 // It must be initialized by copying from an IndexMapBiDi or by DeSerialize.
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44 class TESS_API IndexMap {
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45 public:
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46 virtual ~IndexMap();
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48 // SparseToCompact takes a sparse index to an index in the compact space.
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49 // Uses a binary search to find the result. For faster speed use
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50 // IndexMapBiDi, but that takes more memory.
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51 virtual int SparseToCompact(int sparse_index) const;
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53 // CompactToSparse takes a compact index to the corresponding index in the
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54 // sparse space.
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55 int CompactToSparse(int compact_index) const {
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56 return compact_map_[compact_index];
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57 }
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58 // The size of the sparse space.
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59 virtual int SparseSize() const {
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60 return sparse_size_;
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61 }
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62 // The size of the compact space.
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63 int CompactSize() const {
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64 return compact_map_.size();
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65 }
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66
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67 // Copy from the input.
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68 void CopyFrom(const IndexMap &src);
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69 void CopyFrom(const IndexMapBiDi &src);
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71 // Writes to the given file. Returns false in case of error.
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72 bool Serialize(FILE *fp) const;
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73 // Reads from the given file. Returns false in case of error.
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74 // If swap is true, assumes a big/little-endian swap is needed.
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75 bool DeSerialize(bool swap, FILE *fp);
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76
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77 protected:
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78 // The sparse space covers integers in the range [0, sparse_size_-1].
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79 int32_t sparse_size_;
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80 // The compact space covers integers in the range [0, compact_map_.size()-1].
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81 // Each element contains the corresponding sparse index.
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82 std::vector<int32_t> compact_map_;
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83 };
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84
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85 // Bidirectional many-to-one mapping between a sparse and a compact discrete
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86 // space. As with IndexMap, many entries may be unmapped, but unlike IndexMap,
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87 // of those that are, many may be mapped to the same compact index.
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88 // If the map is many-to-one, it is not possible to directly obtain all the
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89 // sparse indices that map to a single compact index.
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90 // This map is time- rather than space-efficient. It stores the entire sparse
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91 // space.
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92 // IndexMapBiDi may be initialized in one of 3 ways:
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93 // 1. Init(size, true);
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94 // Setup();
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95 // Sets a complete 1:1 mapping with no unmapped elements.
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96 // 2. Init(size, false);
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97 // for ... SetMap(index, true);
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98 // Setup();
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99 // Specifies precisely which sparse indices are mapped. The mapping is 1:1.
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100 // 3. Either of the above, followed by:
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101 // for ... Merge(index1, index2);
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102 // CompleteMerges();
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103 // Allows a many-to-one mapping by merging compact space indices.
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104 class TESS_API IndexMapBiDi : public IndexMap {
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105 public:
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106 ~IndexMapBiDi() override;
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107
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108 // Top-level init function in a single call to initialize a map to select
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109 // a single contiguous subrange [start, end) of the sparse space to be mapped
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110 // 1 to 1 to the compact space, with all other elements of the sparse space
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111 // left unmapped.
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112 // No need to call Setup after this.
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113 void InitAndSetupRange(int sparse_size, int start, int end);
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114
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115 // Initializes just the sparse_map_ to the given size with either all
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116 // forward indices mapped (all_mapped = true) or none (all_mapped = false).
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117 // Call Setup immediately after, or make calls to SetMap first to adjust the
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118 // mapping and then call Setup before using the map.
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119 void Init(int size, bool all_mapped);
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120 // Sets a given index in the sparse_map_ to be mapped or not.
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121 void SetMap(int sparse_index, bool mapped);
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122 // Sets up the sparse_map_ and compact_map_ properly after Init and
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123 // some calls to SetMap. Assumes an ordered 1-1 map from set indices
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124 // in the sparse space to the compact space.
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125 void Setup();
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126
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127 // Merges the two compact space indices. May be called many times, but
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128 // the merges must be concluded by a call to CompleteMerges.
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129 // Returns true if a merge was actually performed.
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130 bool Merge(int compact_index1, int compact_index2);
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131 // Returns true if the given compact index has been deleted.
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132 bool IsCompactDeleted(int index) const {
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133 return MasterCompactIndex(index) < 0;
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134 }
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135 // Completes one or more Merge operations by further compacting the
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136 // compact space.
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137 void CompleteMerges();
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138
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139 // SparseToCompact takes a sparse index to an index in the compact space.
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140 int SparseToCompact(int sparse_index) const override {
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141 return sparse_map_[sparse_index];
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142 }
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143 // The size of the sparse space.
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144 int SparseSize() const override {
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145 return sparse_map_.size();
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146 }
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147
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148 // Copy from the input.
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149 void CopyFrom(const IndexMapBiDi &src);
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150
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151 // Writes to the given file. Returns false in case of error.
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152 bool Serialize(FILE *fp) const;
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153 // Reads from the given file. Returns false in case of error.
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154 // If swap is true, assumes a big/little-endian swap is needed.
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155 bool DeSerialize(bool swap, FILE *fp);
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156
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157 // Bulk calls to SparseToCompact.
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158 // Maps the given array of sparse indices to an array of compact indices.
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159 // Assumes the input is sorted. The output indices are sorted and uniqued.
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160 // Return value is the number of "missed" features, being features that
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161 // don't map to the compact feature space.
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162 int MapFeatures(const std::vector<int> &sparse, std::vector<int> *compact) const;
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163
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164 private:
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165 // Returns the master compact index for a given compact index.
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166 // During a multiple merge operation, several compact indices may be
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167 // combined, so we need to be able to find the master of all.
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168 int MasterCompactIndex(int compact_index) const {
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169 while (compact_index >= 0 && sparse_map_[compact_map_[compact_index]] != compact_index) {
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170 compact_index = sparse_map_[compact_map_[compact_index]];
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171 }
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172 return compact_index;
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173 }
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174
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175 // Direct look-up of the compact index for each element in sparse space.
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176 std::vector<int32_t> sparse_map_;
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177 };
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178
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179 } // namespace tesseract.
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180
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181 #endif // TESSERACT_CCUTIL_INDEXMAPBIDI_H_