Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/protos.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 *
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3 * File: protos.cpp (Formerly protos.c)
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4 * Author: Mark Seaman, OCR Technology
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5 *
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6 * (c) Copyright 1987, Hewlett-Packard Company.
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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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18 /*----------------------------------------------------------------------
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19 I n c l u d e s
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20 ----------------------------------------------------------------------*/
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21 #define _USE_MATH_DEFINES // for M_PI
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23 #include "protos.h"
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25 #include "classify.h"
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26 #include "intproto.h"
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27 #include "params.h"
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28 #include "tprintf.h"
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30 #include <cmath> // for M_PI
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31 #include <cstdio>
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33 namespace tesseract {
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35 #define PROTO_INCREMENT 32
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36 #define CONFIG_INCREMENT 16
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38 /*----------------------------------------------------------------------
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39 F u n c t i o n s
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40 ----------------------------------------------------------------------*/
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41 /**
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42 * @name AddConfigToClass
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43 *
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44 * Add a new config to this class. Malloc new space and copy the
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45 * old configs if necessary. Return the config id for the new config.
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46 *
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47 * @param Class The class to add to
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48 */
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49 int AddConfigToClass(CLASS_TYPE Class) {
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50 int NewNumConfigs;
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51 int NewConfig;
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52 int MaxNumProtos;
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53 BIT_VECTOR Config;
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55 MaxNumProtos = Class->MaxNumProtos;
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56 ASSERT_HOST(MaxNumProtos <= MAX_NUM_PROTOS);
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58 if (Class->NumConfigs >= Class->MaxNumConfigs) {
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59 /* add configs in CONFIG_INCREMENT chunks at a time */
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60 NewNumConfigs =
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61 (((Class->MaxNumConfigs + CONFIG_INCREMENT) / CONFIG_INCREMENT) * CONFIG_INCREMENT);
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63 Class->Configurations.resize(NewNumConfigs);
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64 Class->MaxNumConfigs = NewNumConfigs;
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65 }
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66 NewConfig = Class->NumConfigs++;
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67 Config = NewBitVector(MAX_NUM_PROTOS);
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68 Class->Configurations[NewConfig] = Config;
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69 zero_all_bits(Config, WordsInVectorOfSize(MAX_NUM_PROTOS));
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71 return (NewConfig);
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72 }
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74 /**
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75 * @name AddProtoToClass
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76 *
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77 * Add a new proto to this class. Malloc new space and copy the
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78 * old protos if necessary. Return the proto id for the new proto.
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79 *
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80 * @param Class The class to add to
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81 */
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82 int AddProtoToClass(CLASS_TYPE Class) {
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83 if (Class->NumProtos >= Class->MaxNumProtos) {
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84 /* add protos in PROTO_INCREMENT chunks at a time */
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85 int NewNumProtos =
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86 (((Class->MaxNumProtos + PROTO_INCREMENT) / PROTO_INCREMENT) * PROTO_INCREMENT);
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87
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88 Class->Prototypes.resize(NewNumProtos);
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90 Class->MaxNumProtos = NewNumProtos;
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91 ASSERT_HOST(NewNumProtos <= MAX_NUM_PROTOS);
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92 }
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93 int NewProto = Class->NumProtos++;
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94 ASSERT_HOST(Class->NumProtos <= MAX_NUM_PROTOS);
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95 return (NewProto);
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96 }
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98 /**********************************************************************
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99 * FillABC
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100 *
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101 * Fill in Protos A, B, C fields based on the X, Y, Angle fields.
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102 **********************************************************************/
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103 void FillABC(PROTO_STRUCT *Proto) {
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104 float Slope, Intercept, Normalizer;
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105
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106 Slope = tan(Proto->Angle * 2.0 * M_PI);
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107 Intercept = Proto->Y - Slope * Proto->X;
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108 Normalizer = 1.0 / sqrt(Slope * Slope + 1.0);
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109 Proto->A = Slope * Normalizer;
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110 Proto->B = -Normalizer;
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111 Proto->C = Intercept * Normalizer;
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112 }
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113
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114 /**********************************************************************
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115 * FreeClass
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116 *
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117 * Deallocate the memory consumed by the specified class.
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118 **********************************************************************/
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119 void FreeClass(CLASS_TYPE Class) {
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120 if (Class) {
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121 FreeClassFields(Class);
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122 delete Class;
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123 }
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124 }
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125
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126 /**********************************************************************
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127 * FreeClassFields
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128 *
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129 * Deallocate the memory consumed by subfields of the specified class.
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130 **********************************************************************/
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131 void FreeClassFields(CLASS_TYPE Class) {
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132 if (Class) {
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133 for (int i = 0; i < Class->NumConfigs; i++) {
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134 FreeBitVector(Class->Configurations[i]);
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135 }
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136 }
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137 }
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138
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139 /**********************************************************************
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140 * NewClass
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141 *
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142 * Allocate a new class with enough memory to hold the specified number
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143 * of prototypes and configurations.
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144 **********************************************************************/
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145 CLASS_TYPE NewClass(int NumProtos, int NumConfigs) {
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146 CLASS_TYPE Class;
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147
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148 Class = new CLASS_STRUCT;
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149
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150 Class->Prototypes.resize(NumProtos);
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151 Class->Configurations.resize(NumConfigs);
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152 Class->MaxNumProtos = NumProtos;
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153 Class->MaxNumConfigs = NumConfigs;
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154 Class->NumProtos = 0;
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155 Class->NumConfigs = 0;
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156 return (Class);
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157 }
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158
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159 } // namespace tesseract