Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/cntraining.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: cntraining.cpp
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3 ** Purpose: Generates a normproto and pffmtable.
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4 ** Author: Dan Johnson
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5 ** Revisment: Christy Russon
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6 **
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7 ** (c) Copyright Hewlett-Packard Company, 1988.
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8 ** Licensed under the Apache License, Version 2.0 (the "License");
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9 ** you may not use this file except in compliance with the License.
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10 ** You may obtain a copy of the License at
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11 ** http://www.apache.org/licenses/LICENSE-2.0
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12 ** Unless required by applicable law or agreed to in writing, software
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13 ** distributed under the License is distributed on an "AS IS" BASIS,
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14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 ** See the License for the specific language governing permissions and
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16 ** limitations under the License.
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17 ******************************************************************************/
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19 /*----------------------------------------------------------------------------
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20 Include Files and Type Defines
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21 ----------------------------------------------------------------------------*/
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22 #include <tesseract/unichar.h>
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23 #include <cmath>
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24 #include <cstdio>
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25 #include <cstring>
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26 #include "cluster.h"
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27 #include "clusttool.h"
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28 #include "commontraining.h"
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29 #include "featdefs.h"
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30 #include "ocrfeatures.h"
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31 #include "oldlist.h"
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33 #define PROGRAM_FEATURE_TYPE "cn"
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35 using namespace tesseract;
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37 /*----------------------------------------------------------------------------
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38 Private Function Prototypes
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39 ----------------------------------------------------------------------------*/
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41 static void WriteNormProtos(const char *Directory, LIST LabeledProtoList,
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42 const FEATURE_DESC_STRUCT *feature_desc);
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44 static void WriteProtos(FILE *File, uint16_t N, LIST ProtoList, bool WriteSigProtos,
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45 bool WriteInsigProtos);
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47 /*----------------------------------------------------------------------------
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48 Global Data Definitions and Declarations
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49 ----------------------------------------------------------------------------*/
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50 /* global variable to hold configuration parameters to control clustering */
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51 //-M 0.025 -B 0.05 -I 0.8 -C 1e-3
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52 static const CLUSTERCONFIG CNConfig = {elliptical, 0.025, 0.05, 0.8, 1e-3, 0};
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53
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54 /*----------------------------------------------------------------------------
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55 Public Code
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56 ----------------------------------------------------------------------------*/
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57
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58 /**
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59 * This program reads in a text file consisting of feature
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60 * samples from a training page in the following format:
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61 * @verbatim
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62 FontName CharName NumberOfFeatureTypes(N)
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63 FeatureTypeName1 NumberOfFeatures(M)
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64 Feature1
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65 ...
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66 FeatureM
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67 FeatureTypeName2 NumberOfFeatures(M)
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68 Feature1
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69 ...
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70 FeatureM
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71 ...
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72 FeatureTypeNameN NumberOfFeatures(M)
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73 Feature1
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74 ...
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75 FeatureM
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76 FontName CharName ...
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77 @endverbatim
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78 * It then appends these samples into a separate file for each
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79 * character. The name of the file is
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80 *
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81 * DirectoryName/FontName/CharName.FeatureTypeName
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82 *
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83 * The DirectoryName can be specified via a command
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84 * line argument. If not specified, it defaults to the
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85 * current directory. The format of the resulting files is:
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86 * @verbatim
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87 NumberOfFeatures(M)
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88 Feature1
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89 ...
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90 FeatureM
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91 NumberOfFeatures(M)
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92 ...
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93 @endverbatim
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94 * The output files each have a header which describes the
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95 * type of feature which the file contains. This header is
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96 * in the format required by the clusterer. A command line
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97 * argument can also be used to specify that only the first
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98 * N samples of each class should be used.
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99 * @param argc number of command line arguments
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100 * @param argv array of command line arguments
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101 * @return 0 on success
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102 */
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103 int main(int argc, char *argv[]) {
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104 tesseract::CheckSharedLibraryVersion();
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105
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106 // Set the global Config parameters before parsing the command line.
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107 Config = CNConfig;
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108
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109 LIST CharList = NIL_LIST;
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110 CLUSTERER *Clusterer = nullptr;
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111 LIST ProtoList = NIL_LIST;
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112 LIST NormProtoList = NIL_LIST;
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113 LIST pCharList;
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114 LABELEDLIST CharSample;
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115 FEATURE_DEFS_STRUCT FeatureDefs;
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116 InitFeatureDefs(&FeatureDefs);
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117
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118 ParseArguments(&argc, &argv);
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119 #if !defined(NDEBUG)
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120 int num_fonts = 0;
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121 #endif
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122 for (const char *PageName = *++argv; PageName != nullptr; PageName = *++argv) {
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123 printf("Reading %s ...\n", PageName);
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124 FILE *TrainingPage = fopen(PageName, "rb");
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125 ASSERT_HOST(TrainingPage);
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126 if (TrainingPage) {
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127 ReadTrainingSamples(FeatureDefs, PROGRAM_FEATURE_TYPE, 100, nullptr, TrainingPage, &CharList);
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128 fclose(TrainingPage);
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129 #if !defined(NDEBUG)
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130 ++num_fonts;
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131 #endif
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132 }
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133 }
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134 printf("Clustering ...\n");
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135 // To allow an individual font to form a separate cluster,
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136 // reduce the min samples:
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137 // Config.MinSamples = 0.5 / num_fonts;
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138 pCharList = CharList;
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139 // The norm protos will count the source protos, so we keep them here in
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140 // freeable_protos, so they can be freed later.
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141 std::vector<LIST> freeable_protos;
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142 iterate(pCharList) {
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143 // Cluster
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144 CharSample = reinterpret_cast<LABELEDLIST>(pCharList->first_node());
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145 Clusterer = SetUpForClustering(FeatureDefs, CharSample, PROGRAM_FEATURE_TYPE);
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146 if (Clusterer == nullptr) { // To avoid a SIGSEGV
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147 fprintf(stderr, "Error: nullptr clusterer!\n");
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148 return EXIT_FAILURE;
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149 }
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150 float SavedMinSamples = Config.MinSamples;
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151 // To disable the tendency to produce a single cluster for all fonts,
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152 // make MagicSamples an impossible to achieve number:
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153 // Config.MagicSamples = CharSample->SampleCount * 10;
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154 Config.MagicSamples = CharSample->SampleCount;
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155 while (Config.MinSamples > 0.001) {
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156 ProtoList = ClusterSamples(Clusterer, &Config);
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157 if (NumberOfProtos(ProtoList, true, false) > 0) {
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158 break;
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159 } else {
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160 Config.MinSamples *= 0.95;
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161 printf(
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162 "0 significant protos for %s."
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163 " Retrying clustering with MinSamples = %f%%\n",
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164 CharSample->Label.c_str(), Config.MinSamples);
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165 }
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166 }
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167 Config.MinSamples = SavedMinSamples;
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168 AddToNormProtosList(&NormProtoList, ProtoList, CharSample->Label);
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169 freeable_protos.push_back(ProtoList);
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170 FreeClusterer(Clusterer);
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171 }
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172 FreeTrainingSamples(CharList);
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173 int desc_index = ShortNameToFeatureType(FeatureDefs, PROGRAM_FEATURE_TYPE);
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174 WriteNormProtos(FLAGS_D.c_str(), NormProtoList, FeatureDefs.FeatureDesc[desc_index]);
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175 FreeNormProtoList(NormProtoList);
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176 for (auto &freeable_proto : freeable_protos) {
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177 FreeProtoList(&freeable_proto);
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178 }
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179 printf("\n");
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180 return EXIT_SUCCESS;
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181 } // main
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182
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183 /*----------------------------------------------------------------------------
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184 Private Code
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185 ----------------------------------------------------------------------------*/
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186
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187 /*----------------------------------------------------------------------------*/
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188 /**
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189 * This routine writes the specified samples into files which
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190 * are organized according to the font name and character name
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191 * of the samples.
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192 * @param Directory directory to place sample files into
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193 * @param LabeledProtoList List of labeled protos
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194 * @param feature_desc Description of the features
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195 */
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196 static void WriteNormProtos(const char *Directory, LIST LabeledProtoList,
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197 const FEATURE_DESC_STRUCT *feature_desc) {
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198 FILE *File;
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199 LABELEDLIST LabeledProto;
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200 int N;
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201
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202 std::string Filename = "";
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203 if (Directory != nullptr && Directory[0] != '\0') {
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204 Filename += Directory;
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205 Filename += "/";
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206 }
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207 Filename += "normproto";
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208 printf("\nWriting %s ...", Filename.c_str());
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209 File = fopen(Filename.c_str(), "wb");
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210 ASSERT_HOST(File);
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211 fprintf(File, "%0d\n", feature_desc->NumParams);
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212 WriteParamDesc(File, feature_desc->NumParams, feature_desc->ParamDesc);
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213 iterate(LabeledProtoList) {
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214 LabeledProto = reinterpret_cast<LABELEDLIST>(LabeledProtoList->first_node());
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215 N = NumberOfProtos(LabeledProto->List, true, false);
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216 if (N < 1) {
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217 printf(
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218 "\nError! Not enough protos for %s: %d protos"
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219 " (%d significant protos"
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220 ", %d insignificant protos)\n",
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221 LabeledProto->Label.c_str(), N, NumberOfProtos(LabeledProto->List, true, false),
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222 NumberOfProtos(LabeledProto->List, false, true));
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223 exit(1);
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224 }
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225 fprintf(File, "\n%s %d\n", LabeledProto->Label.c_str(), N);
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226 WriteProtos(File, feature_desc->NumParams, LabeledProto->List, true, false);
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227 }
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228 fclose(File);
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229
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230 } // WriteNormProtos
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231
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232 /*-------------------------------------------------------------------------*/
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233
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234 static void WriteProtos(FILE *File, uint16_t N, LIST ProtoList, bool WriteSigProtos,
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235 bool WriteInsigProtos) {
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236 PROTOTYPE *Proto;
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237
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238 // write prototypes
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239 iterate(ProtoList) {
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240 Proto = reinterpret_cast<PROTOTYPE *>(ProtoList->first_node());
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241 if ((Proto->Significant && WriteSigProtos) || (!Proto->Significant && WriteInsigProtos)) {
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242 WritePrototype(File, N, Proto);
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243 }
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244 }
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245 } // WriteProtos