Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/featdefs.cpp @ 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 /******************************************************************************
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2 ** Filename: featdefs.cpp
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3 ** Purpose: Definitions of currently defined feature types.
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4 ** Author: Dan Johnson
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5 **
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6 ** (c) Copyright Hewlett-Packard Company, 1988.
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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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18 #include "featdefs.h"
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20 #include "picofeat.h" // for PicoFeatureLength
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21 #include "scanutils.h"
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23 #include <cstdio>
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24 #include <cstring>
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26 namespace tesseract {
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28 #define PICO_FEATURE_LENGTH 0.05
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30 /*-----------------------------------------------------------------------------
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31 Global Data Definitions and Declarations
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32 -----------------------------------------------------------------------------*/
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33 const char *const kMicroFeatureType = "mf";
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34 const char *const kCNFeatureType = "cn";
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35 const char *const kIntFeatureType = "if";
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36 const char *const kGeoFeatureType = "tb";
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38 // Define all of the parameters for the MicroFeature type.
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39 StartParamDesc(MicroFeatureParams) DefineParam(0, 0, -0.5, 0.5) DefineParam(0, 0, -0.25, 0.75)
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40 DefineParam(0, 1, 0.0, 1.0) DefineParam(1, 0, 0.0, 1.0) DefineParam(0, 1, -0.5, 0.5)
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41 DefineParam(0, 1, -0.5, 0.5) EndParamDesc
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42 // Now define the feature type itself (see features.h for parameters).
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43 DefineFeature(MicroFeatureDesc, 5, 1, kMicroFeatureType, MicroFeatureParams)
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45 // Define all of the parameters for the NormFeat type.
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46 StartParamDesc(CharNormParams) DefineParam(0, 0, -0.25, 0.75) DefineParam(0, 1, 0.0, 1.0)
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47 DefineParam(0, 0, 0.0, 1.0) DefineParam(0, 0, 0.0, 1.0) EndParamDesc
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48 // Now define the feature type itself (see features.h for parameters).
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49 DefineFeature(CharNormDesc, 4, 0, kCNFeatureType, CharNormParams)
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51 // Define all of the parameters for the IntFeature type
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52 StartParamDesc(IntFeatParams) DefineParam(0, 0, 0.0, 255.0) DefineParam(0, 0, 0.0, 255.0)
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53 DefineParam(1, 0, 0.0, 255.0) EndParamDesc
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54 // Now define the feature type itself (see features.h for parameters).
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55 DefineFeature(IntFeatDesc, 2, 1, kIntFeatureType, IntFeatParams)
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57 // Define all of the parameters for the GeoFeature type
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58 StartParamDesc(GeoFeatParams) DefineParam(0, 0, 0.0, 255.0) DefineParam(0, 0, 0.0, 255.0)
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59 DefineParam(0, 0, 0.0, 255.0) EndParamDesc
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60 // Now define the feature type itself (see features.h for parameters).
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61 DefineFeature(GeoFeatDesc, 3, 0, kGeoFeatureType, GeoFeatParams)
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63 // Other features used for training the adaptive classifier, but not used
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64 // during normal training, therefore not in the DescDefs array.
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66 // Define all of the parameters for the PicoFeature type
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67 // define knob that can be used to adjust pico-feature length.
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68 float PicoFeatureLength = PICO_FEATURE_LENGTH;
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69 StartParamDesc(PicoFeatParams) DefineParam(0, 0, -0.25, 0.75) DefineParam(1, 0, 0.0, 1.0)
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70 DefineParam(0, 0, -0.5, 0.5) EndParamDesc
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71 // Now define the feature type itself (see features.h for parameters).
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72 DefineFeature(PicoFeatDesc, 2, 1, "pf", PicoFeatParams)
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74 // Define all of the parameters for the OutlineFeature type.
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75 StartParamDesc(OutlineFeatParams) DefineParam(0, 0, -0.5, 0.5) DefineParam(0, 0, -0.25, 0.75)
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76 DefineParam(0, 0, 0.0, 1.0) DefineParam(1, 0, 0.0, 1.0) EndParamDesc
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77 // Now define the feature type itself (see features.h for parameters).
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78 DefineFeature(OutlineFeatDesc, 3, 1, "of", OutlineFeatParams)
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80 // MUST be kept in-sync with ExtractorDefs in fxdefs.cpp.
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81 static const FEATURE_DESC_STRUCT *DescDefs[NUM_FEATURE_TYPES] = {
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82 &MicroFeatureDesc, &CharNormDesc, &IntFeatDesc, &GeoFeatDesc};
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83
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84 /*-----------------------------------------------------------------------------
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85 Public Code
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86 -----------------------------------------------------------------------------*/
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87 void InitFeatureDefs(FEATURE_DEFS_STRUCT *featuredefs) {
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88 featuredefs->NumFeatureTypes = NUM_FEATURE_TYPES;
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89 for (int i = 0; i < NUM_FEATURE_TYPES; ++i) {
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90 featuredefs->FeatureDesc[i] = DescDefs[i];
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91 }
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92 }
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94 /*---------------------------------------------------------------------------*/
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95 /**
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96 * Appends a textual representation of CharDesc to str.
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97 * The format used is to write out the number of feature
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98 * sets which will be written followed by a representation of
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99 * each feature set.
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100 *
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101 * Each set starts with the short name for that feature followed
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102 * by a description of the feature set. Feature sets which are
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103 * not present are not written.
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104 *
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105 * @param FeatureDefs definitions of feature types/extractors
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106 * @param str string to append CharDesc to
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107 * @param CharDesc character description to write to File
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108 */
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109 void WriteCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs, CHAR_DESC_STRUCT *CharDesc, std::string &str) {
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110 int NumSetsToWrite = 0;
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111
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112 for (size_t Type = 0; Type < CharDesc->NumFeatureSets; Type++) {
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113 if (CharDesc->FeatureSets[Type]) {
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114 NumSetsToWrite++;
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115 }
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116 }
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117
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118 str += " " + std::to_string(NumSetsToWrite);
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119 str += "\n";
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120 for (size_t Type = 0; Type < CharDesc->NumFeatureSets; Type++) {
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121 if (CharDesc->FeatureSets[Type]) {
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122 str += FeatureDefs.FeatureDesc[Type]->ShortName;
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123 str += " ";
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124 WriteFeatureSet(CharDesc->FeatureSets[Type], str);
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125 }
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126 }
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127 } /* WriteCharDescription */
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128
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129 // Return whether all of the fields of the given feature set
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130 // are well defined (not inf or nan).
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131 bool ValidCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs, CHAR_DESC_STRUCT *CharDesc) {
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132 bool anything_written = false;
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133 bool well_formed = true;
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134 for (size_t Type = 0; Type < CharDesc->NumFeatureSets; Type++) {
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135 if (CharDesc->FeatureSets[Type]) {
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136 for (int i = 0; i < CharDesc->FeatureSets[Type]->NumFeatures; i++) {
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137 FEATURE feat = CharDesc->FeatureSets[Type]->Features[i];
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138 for (int p = 0; p < feat->Type->NumParams; p++) {
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139 if (std::isnan(feat->Params[p]) || std::isinf(feat->Params[p])) {
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140 well_formed = false;
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141 } else {
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142 anything_written = true;
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143 }
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144 }
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145 }
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146 } else {
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147 return false;
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148 }
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149 }
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150 return anything_written && well_formed;
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151 } /* ValidCharDescription */
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152
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153 /*---------------------------------------------------------------------------*/
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154 /**
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155 * Read a character description from File, and return
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156 * a data structure containing this information. The data
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157 * is formatted as follows:
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158 * @verbatim
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159 NumberOfSets
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160 ShortNameForSet1 Set1
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161 ShortNameForSet2 Set2
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162 ...
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163 @endverbatim
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164 *
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165 * Globals:
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166 * - none
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167 *
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168 * @param FeatureDefs definitions of feature types/extractors
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169 * @param File open text file to read character description from
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170 * @return Character description read from File.
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171 */
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172 CHAR_DESC_STRUCT *ReadCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs, FILE *File) {
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173 int NumSetsToRead;
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174 char ShortName[FEAT_NAME_SIZE];
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175 int Type;
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176
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177 ASSERT_HOST(tfscanf(File, "%d", &NumSetsToRead) == 1);
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178 ASSERT_HOST(NumSetsToRead >= 0);
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179 ASSERT_HOST(NumSetsToRead <= FeatureDefs.NumFeatureTypes);
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180
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181 auto CharDesc = new CHAR_DESC_STRUCT(FeatureDefs);
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182 for (; NumSetsToRead > 0; NumSetsToRead--) {
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183 tfscanf(File, "%s", ShortName);
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184 Type = ShortNameToFeatureType(FeatureDefs, ShortName);
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185 CharDesc->FeatureSets[Type] = ReadFeatureSet(File, FeatureDefs.FeatureDesc[Type]);
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186 }
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187 return CharDesc;
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188 }
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189
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190 /*---------------------------------------------------------------------------*/
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191 /**
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192 * Search through all features currently defined and return
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193 * the feature type for the feature with the specified short
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194 * name. Trap an error if the specified name is not found.
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195 *
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196 * Globals:
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197 * - none
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198 *
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199 * @param FeatureDefs definitions of feature types/extractors
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200 * @param ShortName short name of a feature type
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201 * @return Feature type which corresponds to ShortName.
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202 */
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203 uint32_t ShortNameToFeatureType(const FEATURE_DEFS_STRUCT &FeatureDefs, const char *ShortName) {
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204 for (int i = 0; i < FeatureDefs.NumFeatureTypes; i++) {
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205 if (!strcmp((FeatureDefs.FeatureDesc[i]->ShortName), ShortName)) {
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206 return static_cast<uint32_t>(i);
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207 }
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208 }
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209 ASSERT_HOST(!"Illegal short name for a feature");
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210 return 0;
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211 }
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212
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213 } // namespace tesseract