Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/shapetable.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 2010 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: shapetable.h
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5 // Description: Class to map a classifier shape index to unicharset
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6 // indices and font indices.
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7 // Author: Ray Smith
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8 //
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9 // (C) Copyright 2010, Google Inc.
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10 // Licensed under the Apache License, Version 2.0 (the "License");
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11 // you may not use this file except in compliance with the License.
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12 // You may obtain a copy of the License at
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13 // http://www.apache.org/licenses/LICENSE-2.0
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14 // Unless required by applicable law or agreed to in writing, software
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15 // distributed under the License is distributed on an "AS IS" BASIS,
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16 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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17 // See the License for the specific language governing permissions and
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18 // limitations under the License.
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19 //
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20 ///////////////////////////////////////////////////////////////////////
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21
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22 #ifndef TESSERACT_CLASSIFY_SHAPETABLE_H_
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23 #define TESSERACT_CLASSIFY_SHAPETABLE_H_
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25 #include "bitvector.h"
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26 #include "fontinfo.h"
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27 #include "genericheap.h"
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28 #include "intmatcher.h"
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29 #include "tesserrstream.h" // for tesserr
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31 namespace tesseract {
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33 class UNICHARSET;
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34 class ShapeTable;
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36 // Simple struct to hold a single classifier unichar selection, a corresponding
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37 // rating, and a list of appropriate fonts.
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38 struct UnicharRating {
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39 UnicharRating() : unichar_id(0), rating(0.0f), adapted(false), config(0), feature_misses(0) {}
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40 UnicharRating(int u, float r)
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41 : unichar_id(u), rating(r), adapted(false), config(0), feature_misses(0) {}
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43 // Print debug info.
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44 void Print() const {
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45 tesserr << "Unichar-id=" << unichar_id << ", rating=" << rating
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46 << ", adapted=" << adapted << ", config=" << config
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47 << ", misses=" << feature_misses << ", "
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48 << fonts.size() << " fonts\n";
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49 }
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51 // Helper function to get the index of the first result with the required
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52 // unichar_id. If the results are sorted by rating, this will also be the
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53 // best result with the required unichar_id.
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54 // Returns -1 if the unichar_id is not found
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55 static int FirstResultWithUnichar(const std::vector<UnicharRating> &results,
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56 UNICHAR_ID unichar_id);
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58 // Index into some UNICHARSET table indicates the class of the answer.
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59 UNICHAR_ID unichar_id;
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60 // Rating from classifier with 1.0 perfect and 0.0 impossible.
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61 // Call it a probability if you must.
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62 float rating;
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63 // True if this result is from the adaptive classifier.
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64 bool adapted;
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65 // Index of best matching font configuration of result.
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66 uint8_t config;
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67 // Number of features that were total misses - were liked by no classes.
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68 uint16_t feature_misses;
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69 // Unsorted collection of fontinfo ids and scores. Note that a raw result
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70 // from the IntegerMatch will contain config ids, that require transforming
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71 // to fontinfo ids via fontsets and (possibly) shapetable.
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72 std::vector<ScoredFont> fonts;
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73 };
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74
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75 // Classifier result from a low-level classification is an index into some
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76 // ShapeTable and a rating.
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77 struct ShapeRating {
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78 ShapeRating() : shape_id(0), rating(0.0f), raw(0.0f), font(0.0f), joined(false), broken(false) {}
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79 ShapeRating(int s, float r)
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80 : shape_id(s), rating(r), raw(1.0f), font(0.0f), joined(false), broken(false) {}
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81
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82 // Helper function to get the index of the first result with the required
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83 // unichar_id. If the results are sorted by rating, this will also be the
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84 // best result with the required unichar_id.
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85 // Returns -1 if the unichar_id is not found
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86 static int FirstResultWithUnichar(const std::vector<ShapeRating> &results,
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87 const ShapeTable &shape_table, UNICHAR_ID unichar_id);
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88
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89 // Index into some shape table indicates the class of the answer.
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90 int shape_id;
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91 // Rating from classifier with 1.0 perfect and 0.0 impossible.
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92 // Call it a probability if you must.
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93 float rating;
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94 // Subsidiary rating that a classifier may use internally.
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95 float raw;
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96 // Subsidiary rating that a classifier may use internally.
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97 float font;
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98 // Flag indicating that the input may be joined.
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99 bool joined;
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100 // Flag indicating that the input may be broken (a fragment).
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101 bool broken;
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102 };
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103
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104 // Simple struct to hold an entry for a heap-based priority queue of
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105 // ShapeRating.
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106 struct ShapeQueueEntry {
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107 ShapeQueueEntry() : result(ShapeRating(0, 0.0f)), level(0) {}
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108 ShapeQueueEntry(const ShapeRating &rating, int level0) : result(rating), level(level0) {}
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109
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110 // Sort by decreasing rating and decreasing level for equal rating.
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111 bool operator<(const ShapeQueueEntry &other) const {
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112 if (result.rating > other.result.rating) {
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113 return true;
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114 }
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115 if (result.rating == other.result.rating) {
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116 return level > other.level;
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117 }
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118 return false;
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119 }
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120
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121 // Output from classifier.
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122 ShapeRating result;
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123 // Which level in the tree did this come from?
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124 int level;
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125 };
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126 using ShapeQueue = GenericHeap<ShapeQueueEntry>;
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127
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128 // Simple struct to hold a set of fonts associated with a single unichar-id.
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129 // A vector of UnicharAndFonts makes a shape.
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130 struct UnicharAndFonts {
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131 UnicharAndFonts() : unichar_id(0) {}
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132 UnicharAndFonts(int uni_id, int font_id) : unichar_id(uni_id) {
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133 font_ids.push_back(font_id);
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134 }
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135
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136 // Writes to the given file. Returns false in case of error.
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137 bool Serialize(FILE *fp) const;
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138 // Reads from the given file. Returns false in case of error.
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139 bool DeSerialize(TFile *fp);
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140
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141 // Sort function to sort a pair of UnicharAndFonts by unichar_id.
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142 static int SortByUnicharId(const void *v1, const void *v2);
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143 static bool StdSortByUnicharId(const UnicharAndFonts &v1, const UnicharAndFonts &v2);
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144
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145 std::vector<int32_t> font_ids;
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146 int32_t unichar_id;
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147 };
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148
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149 // A Shape is a collection of unichar-ids and a list of fonts associated with
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150 // each, organized as a vector of UnicharAndFonts. Conceptually a Shape is
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151 // a classifiable unit, and represents a group of characters or parts of
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152 // characters that have a similar or identical shape. Shapes/ShapeTables may
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153 // be organized hierarchically from identical shapes at the leaves to vaguely
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154 // similar shapes near the root.
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155 class TESS_API Shape {
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156 public:
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157 Shape() : destination_index_(-1) {}
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158
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159 // Writes to the given file. Returns false in case of error.
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160 bool Serialize(FILE *fp) const;
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161 // Reads from the given file. Returns false in case of error.
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162 bool DeSerialize(TFile *fp);
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163
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164 int destination_index() const {
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165 return destination_index_;
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166 }
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167 void set_destination_index(int index) {
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168 destination_index_ = index;
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169 }
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170 int size() const {
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171 return unichars_.size();
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172 }
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173 // Returns a UnicharAndFonts entry for the given index, which must be
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174 // in the range [0, size()).
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175 const UnicharAndFonts &operator[](int index) const {
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176 return unichars_[index];
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177 }
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178 // Sets the unichar_id of the given index to the new unichar_id.
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179 void SetUnicharId(int index, int unichar_id) {
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180 unichars_[index].unichar_id = unichar_id;
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181 }
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182 // Adds a font_id for the given unichar_id. If the unichar_id is not
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183 // in the shape, it is added.
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184 void AddToShape(int unichar_id, int font_id);
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185 // Adds everything in other to this.
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186 void AddShape(const Shape &other);
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187 // Returns true if the shape contains the given unichar_id, font_id pair.
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188 bool ContainsUnicharAndFont(int unichar_id, int font_id) const;
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189 // Returns true if the shape contains the given unichar_id, ignoring font.
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190 bool ContainsUnichar(int unichar_id) const;
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191 // Returns true if the shape contains the given font, ignoring unichar_id.
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192 bool ContainsFont(int font_id) const;
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193 // Returns true if the shape contains the given font properties, ignoring
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194 // unichar_id.
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195 bool ContainsFontProperties(const FontInfoTable &font_table, uint32_t properties) const;
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196 // Returns true if the shape contains multiple different font properties,
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197 // ignoring unichar_id.
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198 bool ContainsMultipleFontProperties(const FontInfoTable &font_table) const;
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199 // Returns true if this shape is equal to other (ignoring order of unichars
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200 // and fonts).
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201 bool operator==(const Shape &other) const;
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202 // Returns true if this is a subset (including equal) of other.
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203 bool IsSubsetOf(const Shape &other) const;
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204 // Returns true if the lists of unichar ids are the same in this and other,
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205 // ignoring fonts.
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206 // NOT const, as it will sort the unichars on demand.
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207 bool IsEqualUnichars(Shape *other);
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208
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209 private:
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210 // Sorts the unichars_ vector by unichar.
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211 void SortUnichars();
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212
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213 // Flag indicates that the unichars are sorted, allowing faster set
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214 // operations with another shape.
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215 bool unichars_sorted_ = false;
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216 // If this Shape is part of a ShapeTable the destination_index_ is the index
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217 // of some other shape in the ShapeTable with which this shape is merged.
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218 int destination_index_ = 0;
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219 // Array of unichars, each with a set of fonts. Each unichar has at most
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220 // one entry in the vector.
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221 std::vector<UnicharAndFonts> unichars_;
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222 };
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223
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224 // ShapeTable is a class to encapsulate the triple indirection that is
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225 // used here.
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226 // ShapeTable is a vector of shapes.
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227 // Each shape is a vector of UnicharAndFonts representing the set of unichars
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228 // that the shape represents.
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229 // Each UnicharAndFonts also lists the fonts of the unichar_id that were
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230 // mapped to the shape during training.
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231 class TESS_API ShapeTable {
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232 public:
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233 ShapeTable();
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234 // The UNICHARSET reference supplied here, or in set_unicharset below must
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235 // exist for the entire life of the ShapeTable. It is used only by DebugStr.
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236 explicit ShapeTable(const UNICHARSET &unicharset);
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237 ~ShapeTable() {
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238 for (auto data : shape_table_) {
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239 delete data;
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240 }
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241 }
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242
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243 // Writes to the given file. Returns false in case of error.
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244 bool Serialize(FILE *fp) const;
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245 // Reads from the given file. Returns false in case of error.
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246 bool DeSerialize(TFile *fp);
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247
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248 // Accessors.
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249 unsigned NumShapes() const {
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250 return shape_table_.size();
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251 }
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252 const UNICHARSET &unicharset() const {
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253 return *unicharset_;
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254 }
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255 // Returns the number of fonts used in this ShapeTable, computing it if
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256 // necessary.
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257 int NumFonts() const;
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258 // Shapetable takes a pointer to the UNICHARSET, so it must persist for the
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259 // entire life of the ShapeTable.
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260 void set_unicharset(const UNICHARSET &unicharset) {
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261 unicharset_ = &unicharset;
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262 }
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263 // Re-indexes the class_ids in the shapetable according to the given map.
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264 // Useful in conjunction with set_unicharset.
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265 void ReMapClassIds(const std::vector<int> &unicharset_map);
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266 // Returns a string listing the classes/fonts in a shape.
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267 std::string DebugStr(unsigned shape_id) const;
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268 // Returns a debug string summarizing the table.
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269 std::string SummaryStr() const;
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270
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271 // Adds a new shape starting with the given unichar_id and font_id.
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272 // Returns the assigned index.
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273 unsigned AddShape(int unichar_id, int font_id);
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274 // Adds a copy of the given shape unless it is already present.
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275 // Returns the assigned index or index of existing shape if already present.
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276 unsigned AddShape(const Shape &other);
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277 // Removes the shape given by the shape index. All indices above are changed!
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278 void DeleteShape(unsigned shape_id);
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279 // Adds a font_id to the given existing shape index for the given
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280 // unichar_id. If the unichar_id is not in the shape, it is added.
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281 void AddToShape(unsigned shape_id, int unichar_id, int font_id);
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282 // Adds the given shape to the existing shape with the given index.
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283 void AddShapeToShape(unsigned shape_id, const Shape &other);
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284 // Returns the id of the shape that contains the given unichar and font.
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285 // If not found, returns -1.
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286 // If font_id < 0, the font_id is ignored and the first shape that matches
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287 // the unichar_id is returned.
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288 int FindShape(int unichar_id, int font_id) const;
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289 // Returns the first unichar_id and font_id in the given shape.
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290 void GetFirstUnicharAndFont(unsigned shape_id, int *unichar_id, int *font_id) const;
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291
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292 // Accessors for the Shape with the given shape_id.
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293 const Shape &GetShape(unsigned shape_id) const {
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294 return *shape_table_[shape_id];
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295 }
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296 Shape *MutableShape(unsigned shape_id) {
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297 return shape_table_[shape_id];
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298 }
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299
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300 // Expands all the classes/fonts in the shape individually to build
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301 // a ShapeTable.
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302 int BuildFromShape(const Shape &shape, const ShapeTable &master_shapes);
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303
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304 // Returns true if the shapes are already merged.
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305 bool AlreadyMerged(unsigned shape_id1, unsigned shape_id2) const;
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306 // Returns true if any shape contains multiple unichars.
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307 bool AnyMultipleUnichars() const;
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308 // Returns the maximum number of unichars over all shapes.
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309 int MaxNumUnichars() const;
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310 // Merges shapes with a common unichar over the [start, end) interval.
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311 // Assumes single unichar per shape.
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312 void ForceFontMerges(unsigned start, unsigned end);
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313 // Returns the number of unichars in the master shape.
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314 unsigned MasterUnicharCount(unsigned shape_id) const;
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315 // Returns the sum of the font counts in the master shape.
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316 int MasterFontCount(unsigned shape_id) const;
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317 // Returns the number of unichars that would result from merging the shapes.
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318 int MergedUnicharCount(unsigned shape_id1, unsigned shape_id2) const;
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319 // Merges two shape_ids, leaving shape_id2 marked as merged.
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320 void MergeShapes(unsigned shape_id1, unsigned shape_id2);
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321 // Swaps two shape_ids.
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322 void SwapShapes(unsigned shape_id1, unsigned shape_id2);
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323 // Appends the master shapes from other to this.
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324 // Used to create a clean ShapeTable from a merged one, or to create a
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325 // copy of a ShapeTable.
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326 // If not nullptr, shape_map is set to map other shape_ids to this's
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327 // shape_ids.
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328 void AppendMasterShapes(const ShapeTable &other, std::vector<int> *shape_map);
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329 // Returns the number of master shapes remaining after merging.
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330 int NumMasterShapes() const;
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331 // Returns the destination of this shape, (if merged), taking into account
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332 // the fact that the destination may itself have been merged.
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333 // For a non-merged shape, returns the input shape_id.
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334 unsigned MasterDestinationIndex(unsigned shape_id) const;
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335
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336 // Returns false if the unichars in neither shape is a subset of the other..
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337 bool SubsetUnichar(unsigned shape_id1, unsigned shape_id2) const;
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338 // Returns false if the unichars in neither shape is a subset of the other..
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339 bool MergeSubsetUnichar(int merge_id1, int merge_id2, unsigned shape_id) const;
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340 // Returns true if the unichar sets are equal between the shapes.
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341 bool EqualUnichars(unsigned shape_id1, unsigned shape_id2) const;
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342 bool MergeEqualUnichars(int merge_id1, int merge_id2, unsigned shape_id) const;
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343 // Returns true if there is a common unichar between the shapes.
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344 bool CommonUnichars(unsigned shape_id1, unsigned shape_id2) const;
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345 // Returns true if there is a common font id between the shapes.
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346 bool CommonFont(unsigned shape_id1, unsigned shape_id2) const;
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347
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348 // Adds the unichars of the given shape_id to the vector of results. Any
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349 // unichar_id that is already present just has the fonts added to the
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350 // font set for that result without adding a new entry in the vector.
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351 // NOTE: it is assumed that the results are given to this function in order
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352 // of decreasing rating.
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353 // The unichar_map vector indicates the index of the results entry containing
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354 // each unichar, or -1 if the unichar is not yet included in results.
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355 void AddShapeToResults(const ShapeRating &shape_rating, std::vector<int> *unichar_map,
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356 std::vector<UnicharRating> *results) const;
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357
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358 private:
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359 // Adds the given unichar_id to the results if needed, updating unichar_map
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360 // and returning the index of unichar in results.
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361 int AddUnicharToResults(int unichar_id, float rating, std::vector<int> *unichar_map,
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362 std::vector<UnicharRating> *results) const;
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363
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364 // Pointer to a provided unicharset used only by the Debugstr member.
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365 const UNICHARSET *unicharset_;
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366 // Vector of pointers to the Shapes in this ShapeTable.
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367 std::vector<Shape *> shape_table_;
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368
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369 // Cached data calculated on demand.
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370 mutable int num_fonts_;
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371 };
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372
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373 } // namespace tesseract.
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374
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375 #endif // TESSERACT_CLASSIFY_SHAPETABLE_H_