Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/fontinfo.h @ 22:d77477b4e151

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Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: fontinfo.h
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3 // Description: Font information classes abstracted from intproto.h/cpp.
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4 // Author: rays@google.com (Ray Smith)
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5 //
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6 // (C) Copyright 2011, 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_CCSTRUCT_FONTINFO_H_
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20 #define TESSERACT_CCSTRUCT_FONTINFO_H_
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22 #include "errcode.h"
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24 #include <tesseract/unichar.h>
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25 #include "genericvector.h"
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27 #include <cstdint> // for uint16_t, uint32_t
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28 #include <cstdio> // for FILE
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29 #include <vector>
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31 namespace tesseract {
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33 template <typename T>
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34 class UnicityTable;
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36 // Simple struct to hold a font and a score. The scores come from the low-level
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37 // integer matcher, so they are in the uint16_t range. Fonts are an index to
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38 // fontinfo_table.
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39 // These get copied around a lot, so best to keep them small.
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40 struct ScoredFont {
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41 ScoredFont() : fontinfo_id(-1), score(0) {}
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42 ScoredFont(int font_id, uint16_t classifier_score)
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43 : fontinfo_id(font_id), score(classifier_score) {}
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45 // Index into fontinfo table, but inside the classifier, may be a shapetable
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46 // index.
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47 int32_t fontinfo_id;
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48 // Raw score from the low-level classifier.
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49 uint16_t score;
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50 };
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52 // Struct for information about spacing between characters in a particular font.
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53 struct FontSpacingInfo {
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54 int16_t x_gap_before;
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55 int16_t x_gap_after;
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56 std::vector<UNICHAR_ID> kerned_unichar_ids;
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57 std::vector<int16_t> kerned_x_gaps;
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58 };
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60 /*
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61 * font_properties contains properties about boldness, italicness, fixed pitch,
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62 * serif, fraktur
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63 */
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64 struct FontInfo {
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65 FontInfo() : name(nullptr), properties(0), universal_id(0), spacing_vec(nullptr) {}
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66 ~FontInfo() = default;
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68 bool operator==(const FontInfo &rhs) const {
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69 return strcmp(name, rhs.name) == 0;
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70 }
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71
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72 // Writes to the given file. Returns false in case of error.
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73 bool Serialize(FILE *fp) const;
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74 // Reads from the given file. Returns false in case of error.
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75 // If swap is true, assumes a big/little-endian swap is needed.
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76 bool DeSerialize(TFile *fp);
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78 // Reserves unicharset_size spots in spacing_vec.
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79 void init_spacing(int unicharset_size) {
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80 spacing_vec = new std::vector<FontSpacingInfo *>(unicharset_size);
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81 }
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82 // Adds the given pointer to FontSpacingInfo to spacing_vec member
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83 // (FontInfo class takes ownership of the pointer).
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84 // Note: init_spacing should be called before calling this function.
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85 void add_spacing(UNICHAR_ID uch_id, FontSpacingInfo *spacing_info) {
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86 ASSERT_HOST(static_cast<size_t>(uch_id) < spacing_vec->size());
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87 (*spacing_vec)[uch_id] = spacing_info;
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88 }
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89
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90 // Returns the pointer to FontSpacingInfo for the given UNICHAR_ID.
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91 const FontSpacingInfo *get_spacing(UNICHAR_ID uch_id) const {
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92 return (spacing_vec == nullptr || spacing_vec->size() <= static_cast<size_t>(uch_id)) ? nullptr
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93 : (*spacing_vec)[uch_id];
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94 }
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95
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96 // Fills spacing with the value of the x gap expected between the two given
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97 // UNICHAR_IDs. Returns true on success.
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98 bool get_spacing(UNICHAR_ID prev_uch_id, UNICHAR_ID uch_id, int *spacing) const {
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99 const FontSpacingInfo *prev_fsi = this->get_spacing(prev_uch_id);
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100 const FontSpacingInfo *fsi = this->get_spacing(uch_id);
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101 if (prev_fsi == nullptr || fsi == nullptr) {
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102 return false;
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103 }
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104 size_t i = 0;
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105 for (; i < prev_fsi->kerned_unichar_ids.size(); ++i) {
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106 if (prev_fsi->kerned_unichar_ids[i] == uch_id) {
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107 break;
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108 }
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109 }
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110 if (i < prev_fsi->kerned_unichar_ids.size()) {
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111 *spacing = prev_fsi->kerned_x_gaps[i];
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112 } else {
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113 *spacing = prev_fsi->x_gap_after + fsi->x_gap_before;
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114 }
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115 return true;
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116 }
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117
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118 bool is_italic() const {
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119 return properties & 1;
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120 }
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121 bool is_bold() const {
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122 return (properties & 2) != 0;
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123 }
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124 bool is_fixed_pitch() const {
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125 return (properties & 4) != 0;
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126 }
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127 bool is_serif() const {
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128 return (properties & 8) != 0;
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129 }
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130 bool is_fraktur() const {
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131 return (properties & 16) != 0;
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132 }
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133
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134 char *name;
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135 uint32_t properties;
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136 // The universal_id is a field reserved for the initialization process
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137 // to assign a unique id number to all fonts loaded for the current
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138 // combination of languages. This id will then be returned by
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139 // ResultIterator::WordFontAttributes.
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140 int32_t universal_id;
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141 // Horizontal spacing between characters (indexed by UNICHAR_ID).
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142 std::vector<FontSpacingInfo *> *spacing_vec;
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143 };
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144
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145 // Every class (character) owns a FontSet that represents all the fonts that can
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146 // render this character.
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147 // Since almost all the characters from the same script share the same set of
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148 // fonts, the sets are shared over multiple classes (see
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149 // Classify::fontset_table_). Thus, a class only store an id to a set.
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150 // Because some fonts cannot render just one character of a set, there are a
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151 // lot of FontSet that differ only by one font. Rather than storing directly
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152 // the FontInfo in the FontSet structure, it's better to share FontInfos among
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153 // FontSets (Classify::fontinfo_table_).
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154 using FontSet = std::vector<int>;
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155
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156 // Class that adds a bit of functionality on top of GenericVector to
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157 // implement a table of FontInfo that replaces UniCityTable<FontInfo>.
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158 // TODO(rays) change all references once all existing traineddata files
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159 // are replaced.
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160 class FontInfoTable : public GenericVector<FontInfo> {
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161 public:
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162 TESS_API // when you remove inheritance from GenericVector, move this on
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163 // class level
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164 FontInfoTable();
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165 TESS_API
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166 ~FontInfoTable();
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167
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168 // Writes to the given file. Returns false in case of error.
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169 TESS_API
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170 bool Serialize(FILE *fp) const;
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171 // Reads from the given file. Returns false in case of error.
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172 // If swap is true, assumes a big/little-endian swap is needed.
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173 TESS_API
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174 bool DeSerialize(TFile *fp);
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175
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176 // Returns true if the given set of fonts includes one with the same
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177 // properties as font_id.
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178 TESS_API
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179 bool SetContainsFontProperties(int font_id, const std::vector<ScoredFont> &font_set) const;
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180 // Returns true if the given set of fonts includes multiple properties.
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181 TESS_API
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182 bool SetContainsMultipleFontProperties(const std::vector<ScoredFont> &font_set) const;
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183
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184 // Moves any non-empty FontSpacingInfo entries from other to this.
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185 TESS_API
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186 void MoveSpacingInfoFrom(FontInfoTable *other);
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187 // Moves this to the target unicity table.
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188 TESS_API
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189 void MoveTo(UnicityTable<FontInfo> *target);
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190 };
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191
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192 // Deletion callbacks for GenericVector.
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193 void FontInfoDeleteCallback(FontInfo f);
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194
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195 // Callbacks used by UnicityTable to read/write FontInfo/FontSet structures.
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196 bool read_info(TFile *f, FontInfo *fi);
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197 bool write_info(FILE *f, const FontInfo &fi);
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198 bool read_spacing_info(TFile *f, FontInfo *fi);
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199 bool write_spacing_info(FILE *f, const FontInfo &fi);
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200 bool write_set(FILE *f, const FontSet &fs);
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201
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202 } // namespace tesseract.
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203
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204 #endif /* THIRD_PARTY_TESSERACT_CCSTRUCT_FONTINFO_H_ */