Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/ocrfeatures.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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2
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1 /******************************************************************************
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2 ** Filename: ocrfeatures.cpp
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3 ** Purpose: Generic definition of a feature.
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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 "ocrfeatures.h"
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20 #include "scanutils.h"
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22 #include <cassert>
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23 #include <cmath>
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24 #include <sstream> // for std::stringstream
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26 namespace tesseract {
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28 /*----------------------------------------------------------------------------
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29 Public Code
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30 ----------------------------------------------------------------------------*/
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31 /**
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32 * Add a feature to a feature set. If the feature set is
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33 * already full, false is returned to indicate that the
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34 * feature could not be added to the set; otherwise, true is
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35 * returned.
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36 * @param FeatureSet set of features to add Feature to
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37 * @param Feature feature to be added to FeatureSet
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38 * @return true if feature added to set, false if set is already full.
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39 */
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40 bool AddFeature(FEATURE_SET FeatureSet, FEATURE Feature) {
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41 if (FeatureSet->NumFeatures >= FeatureSet->MaxNumFeatures) {
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42 delete Feature;
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43 return false;
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44 }
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46 FeatureSet->Features[FeatureSet->NumFeatures++] = Feature;
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47 return true;
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48 } /* AddFeature */
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49
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50 /**
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51 * Create a new feature of the specified type and read in
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52 * the value of its parameters from File. The extra penalty
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53 * for the feature is also computed by calling the appropriate
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54 * function for the specified feature type. The correct text
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55 * representation for a feature is a list of N floats where
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56 * N is the number of parameters in the feature.
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57 * @param File open text file to read feature from
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58 * @param FeatureDesc specifies type of feature to read from File
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59 * @return New #FEATURE read from File.
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60 */
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61 static FEATURE ReadFeature(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc) {
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62 auto Feature = new FEATURE_STRUCT(FeatureDesc);
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63 for (int i = 0; i < Feature->Type->NumParams; i++) {
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64 ASSERT_HOST(tfscanf(File, "%f", &(Feature->Params[i])) == 1);
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65 #ifndef _WIN32
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66 assert(!std::isnan(Feature->Params[i]));
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67 #endif
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68 }
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69 return Feature;
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70 }
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71
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72 /**
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73 * Create a new feature set of the specified type and read in
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74 * the features from File. The correct text representation
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75 * for a feature set is an integer which specifies the number (N)
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76 * of features in a set followed by a list of N feature
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77 * descriptions.
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78 * @param File open text file to read new feature set from
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79 * @param FeatureDesc specifies type of feature to read from File
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80 * @return New feature set read from File.
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81 */
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82 FEATURE_SET ReadFeatureSet(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc) {
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83 int NumFeatures;
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84 ASSERT_HOST(tfscanf(File, "%d", &NumFeatures) == 1);
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85 ASSERT_HOST(NumFeatures >= 0);
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86
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87 auto FeatureSet = new FEATURE_SET_STRUCT(NumFeatures);
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88 for (int i = 0; i < NumFeatures; i++) {
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89 AddFeature(FeatureSet, ReadFeature(File, FeatureDesc));
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90 }
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91
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92 return FeatureSet;
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93 }
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94
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95 /**
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96 * Appends a textual representation of Feature to str.
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97 * This representation is simply a list of the N parameters
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98 * of the feature, terminated with a newline. It is assumed
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99 * that the ExtraPenalty field can be reconstructed from the
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100 * parameters of the feature. It is also assumed that the
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101 * feature type information is specified or assumed elsewhere.
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102 * @param Feature feature to write out to str
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103 * @param str string to write Feature to
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104 */
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105 static void WriteFeature(FEATURE Feature, std::string &str) {
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106 for (int i = 0; i < Feature->Type->NumParams; i++) {
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107 #ifndef WIN32
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108 assert(!std::isnan(Feature->Params[i]));
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109 #endif
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110 std::stringstream stream;
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111 // Use "C" locale (needed for double value).
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112 stream.imbue(std::locale::classic());
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113 // Use 8 digits for double value.
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114 stream.precision(8);
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115 stream << Feature->Params[i];
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116 str += " " + stream.str();
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117 }
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118 str += "\n";
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119 } /* WriteFeature */
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120
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121 /**
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122 * Write a textual representation of FeatureSet to File.
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123 * This representation is an integer specifying the number of
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124 * features in the set, followed by a newline, followed by
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125 * text representations for each feature in the set.
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126 * @param FeatureSet feature set to write to File
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127 * @param str string to write Feature to
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128 */
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129 void WriteFeatureSet(FEATURE_SET FeatureSet, std::string &str) {
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130 if (FeatureSet) {
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131 str += "" + std::to_string(FeatureSet->NumFeatures);
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132 str += "\n";
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133 for (int i = 0; i < FeatureSet->NumFeatures; i++) {
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134 WriteFeature(FeatureSet->Features[i], str);
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135 }
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136 }
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137 } /* WriteFeatureSet */
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138
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139 } // namespace tesseract