Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/indexmapbidi.cpp @ 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.cpp
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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 #include "helpers.h"
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20 #include "indexmapbidi.h"
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21 #include "serialis.h"
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23 namespace tesseract {
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25 // Destructor.
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26 // It is defined here, so the compiler can create a single vtable
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27 // instead of weak vtables in every compilation unit.
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28 IndexMap::~IndexMap() = default;
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30 // SparseToCompact takes a sparse index to an index in the compact space.
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31 // Uses a binary search to find the result. For faster speed use
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32 // IndexMapBiDi, but that takes more memory.
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33 int IndexMap::SparseToCompact(int sparse_index) const {
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34 auto pos = std::upper_bound(compact_map_.begin(), compact_map_.end(), sparse_index);
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35 if (pos > compact_map_.begin()) {
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36 --pos;
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37 }
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38 auto result = pos - compact_map_.begin();
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39 return compact_map_[result] == sparse_index ? result : -1;
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40 }
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42 // Copy from the input.
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43 void IndexMap::CopyFrom(const IndexMap &src) {
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44 sparse_size_ = src.sparse_size_;
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45 compact_map_ = src.compact_map_;
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46 }
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47 void IndexMap::CopyFrom(const IndexMapBiDi &src) {
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48 sparse_size_ = src.SparseSize();
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49 compact_map_ = src.compact_map_;
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50 }
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52 // Writes to the given file. Returns false in case of error.
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53 bool IndexMap::Serialize(FILE *fp) const {
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54 return tesseract::Serialize(fp, &sparse_size_) && tesseract::Serialize(fp, compact_map_);
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55 }
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56
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57 // Reads from the given file. Returns false in case of error.
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58 // If swap is true, assumes a big/little-endian swap is needed.
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59 bool IndexMap::DeSerialize(bool swap, FILE *fp) {
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60 uint32_t sparse_size;
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61 if (!tesseract::DeSerialize(fp, &sparse_size)) {
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62 return false;
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63 }
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64 if (swap) {
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65 ReverseN(&sparse_size, sizeof(sparse_size));
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66 }
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67 // Arbitrarily limit the number of elements to protect against bad data.
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68 if (sparse_size > UINT16_MAX) {
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69 return false;
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70 }
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71 sparse_size_ = sparse_size;
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72 return tesseract::DeSerialize(swap, fp, compact_map_);
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73 }
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74
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75 // Destructor.
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76 // It is defined here, so the compiler can create a single vtable
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77 // instead of weak vtables in every compilation unit.
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78 IndexMapBiDi::~IndexMapBiDi() = default;
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79
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80 // Top-level init function in a single call to initialize a map to select
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81 // a single contiguous subrange [start, end) of the sparse space to be mapped
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82 // 1 to 1 to the compact space, with all other elements of the sparse space
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83 // left unmapped.
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84 // No need to call Setup after this.
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85 void IndexMapBiDi::InitAndSetupRange(int sparse_size, int start, int end) {
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86 Init(sparse_size, false);
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87 for (int i = start; i < end; ++i) {
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88 SetMap(i, true);
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89 }
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90 Setup();
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91 }
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92
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93 // Initializes just the sparse_map_ to the given size with either all
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94 // forward indices mapped (all_mapped = true) or none (all_mapped = false).
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95 // Call Setup immediately after, or make calls to SetMap first to adjust the
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96 // mapping and then call Setup before using the map.
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97 void IndexMapBiDi::Init(int size, bool all_mapped) {
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98 if (!all_mapped) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
99 sparse_map_.clear();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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100 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
101 sparse_map_.resize(size, -1);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 if (all_mapped) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 for (int i = 0; i < size; ++i) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 sparse_map_[i] = i;
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parents:
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105 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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106 }
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parents:
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107 }
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parents:
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108
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109 // Sets a given index in the sparse_map_ to be mapped or not.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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110 void IndexMapBiDi::SetMap(int sparse_index, bool mapped) {
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
111 sparse_map_[sparse_index] = mapped ? 0 : -1;
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112 }
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parents:
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113
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parents:
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114 // Sets up the sparse_map_ and compact_map_ properly after Init and
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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115 // some calls to SetMap. Assumes an ordered 1-1 map from set indices
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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116 // in the forward map to the compact space.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117 void IndexMapBiDi::Setup() {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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118 int compact_size = 0;
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parents:
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119 for (int &i : sparse_map_) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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120 if (i >= 0) {
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parents:
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121 i = compact_size++;
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122 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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123 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 compact_map_.clear();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
125 compact_map_.resize(compact_size, -1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 for (size_t i = 0; i < sparse_map_.size(); ++i) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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127 if (sparse_map_[i] >= 0) {
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parents:
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128 compact_map_[sparse_map_[i]] = i;
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129 }
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parents:
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130 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
131 sparse_size_ = sparse_map_.size();
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parents:
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132 }
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parents:
diff changeset
133
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 // Copy from the input.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 void IndexMapBiDi::CopyFrom(const IndexMapBiDi &src) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 sparse_map_ = src.sparse_map_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 compact_map_ = src.compact_map_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 sparse_size_ = sparse_map_.size();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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139 }
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parents:
diff changeset
140
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141 // Merges the two compact space indices. May be called many times, but
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 // the merges must be concluded by a call to CompleteMerges.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 // Returns true if a merge was actually performed.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 bool IndexMapBiDi::Merge(int compact_index1, int compact_index2) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 // Find the current master index for index1 and index2.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 compact_index1 = MasterCompactIndex(compact_index1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 compact_index2 = MasterCompactIndex(compact_index2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 // Be sure that index1 < index2.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
149 if (compact_index1 > compact_index2) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 int tmp = compact_index1;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
151 compact_index1 = compact_index2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 compact_index2 = tmp;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 } else if (compact_index1 == compact_index2) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 return false;
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parents:
diff changeset
155 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 // To save iterating over all sparse_map_ entries, simply make the master
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 // entry for index2 point to index1.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 // This leaves behind a potential chain of parents that needs to be chased,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 // as above.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 sparse_map_[compact_map_[compact_index2]] = compact_index1;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 if (compact_index1 >= 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 compact_map_[compact_index2] = compact_map_[compact_index1];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 return true;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 // Completes one or more Merge operations by further compacting the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 // compact space. Unused compact space indices are removed, and the used
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 // ones above shuffled down to fill the gaps.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 // Example:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 // Input sparse_map_: (x indicates -1)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 // x x 0 x 2 x x 4 x 0 x 2 x
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 // Output sparse_map_:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 // x x 0 x 1 x x 2 x 0 x 1 x
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 // Output compact_map_:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 // 2 4 7.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 void IndexMapBiDi::CompleteMerges() {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 // Ensure each sparse_map_entry contains a master compact_map_ index.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 int compact_size = 0;
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parents:
diff changeset
180 for (int &i : sparse_map_) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 int compact_index = MasterCompactIndex(i);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 i = compact_index;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 if (compact_index >= compact_size) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 compact_size = compact_index + 1;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 // Re-generate the compact_map leaving holes for unused indices.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 compact_map_.clear();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 compact_map_.resize(compact_size, -1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 for (size_t i = 0; i < sparse_map_.size(); ++i) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 if (sparse_map_[i] >= 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 if (compact_map_[sparse_map_[i]] == -1) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 compact_map_[sparse_map_[i]] = i;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197 // Compact the compact_map, leaving tmp_compact_map saying where each
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 // index went to in the compacted map.
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199 std::vector<int32_t> tmp_compact_map(compact_size, -1);
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200 compact_size = 0;
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201 for (size_t i = 0; i < compact_map_.size(); ++i) {
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202 if (compact_map_[i] >= 0) {
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203 tmp_compact_map[i] = compact_size;
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204 compact_map_[compact_size++] = compact_map_[i];
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205 }
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206 }
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207 compact_map_.resize(compact_size);
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208 // Now modify the entries in the sparse map to point to the new locations.
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209 for (int &i : sparse_map_) {
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210 if (i >= 0) {
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211 i = tmp_compact_map[i];
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212 }
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213 }
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214 }
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215
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216 // Writes to the given file. Returns false in case of error.
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217 bool IndexMapBiDi::Serialize(FILE *fp) const {
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218 if (!IndexMap::Serialize(fp)) {
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219 return false;
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220 }
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221 // Make a vector containing the rest of the map. If the map is many-to-one
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222 // then each additional sparse entry needs to be stored.
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223 // Normally we store only the compact map to save space.
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224 std::vector<int32_t> remaining_pairs;
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225 for (unsigned i = 0; i < sparse_map_.size(); ++i) {
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226 if (sparse_map_[i] >= 0 && static_cast<unsigned>(compact_map_[sparse_map_[i]]) != i) {
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227 remaining_pairs.push_back(i);
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228 remaining_pairs.push_back(sparse_map_[i]);
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229 }
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230 }
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231 return tesseract::Serialize(fp, remaining_pairs);
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232 }
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233
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234 // Reads from the given file. Returns false in case of error.
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235 // If swap is true, assumes a big/little-endian swap is needed.
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236 bool IndexMapBiDi::DeSerialize(bool swap, FILE *fp) {
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237 if (!IndexMap::DeSerialize(swap, fp)) {
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238 return false;
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239 }
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240 std::vector<int32_t> remaining_pairs;
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241 if (!tesseract::DeSerialize(swap, fp, remaining_pairs)) {
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242 return false;
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243 }
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244 sparse_map_.clear();
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245 sparse_map_.resize(sparse_size_, -1);
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246 for (unsigned i = 0; i < compact_map_.size(); ++i) {
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247 sparse_map_[compact_map_[i]] = i;
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248 }
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249 for (size_t i = 0; i < remaining_pairs.size(); ++i) {
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250 int sparse_index = remaining_pairs[i++];
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251 sparse_map_[sparse_index] = remaining_pairs[i];
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252 }
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diff changeset
253 return true;
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254 }
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255
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256 // Bulk calls to SparseToCompact.
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257 // Maps the given array of sparse indices to an array of compact indices.
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258 // Assumes the input is sorted. The output indices are sorted and uniqued.
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259 // Return value is the number of "missed" features, being features that
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260 // don't map to the compact feature space.
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parents:
diff changeset
261 int IndexMapBiDi::MapFeatures(const std::vector<int> &sparse, std::vector<int> *compact) const {
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262 compact->clear();
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parents:
diff changeset
263 int num_features = sparse.size();
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diff changeset
264 int missed_features = 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
265 int prev_good_feature = -1;
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parents:
diff changeset
266 for (int f = 0; f < num_features; ++f) {
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parents:
diff changeset
267 int feature = sparse_map_[sparse[f]];
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parents:
diff changeset
268 if (feature >= 0) {
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parents:
diff changeset
269 if (feature != prev_good_feature) {
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parents:
diff changeset
270 compact->push_back(feature);
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parents:
diff changeset
271 prev_good_feature = feature;
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272 }
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parents:
diff changeset
273 } else {
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parents:
diff changeset
274 ++missed_features;
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275 }
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276 }
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parents:
diff changeset
277 return missed_features;
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278 }
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279
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diff changeset
280 } // namespace tesseract.