Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/ReaderOptions.h @ 29:f76e6575dca9 v1.26.4+1

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+++++ v1.26.4+1
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 19:59:23 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2016 Nu-book Inc.
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3 * Copyright 2016 ZXing authors
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4 * Copyright 2020 Axel Waggershauser
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5 */
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6 // SPDX-License-Identifier: Apache-2.0
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8 #pragma once
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9
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10 #include "BarcodeFormat.h"
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11 #include "CharacterSet.h"
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12
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13 #include <string_view>
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14 #include <utility>
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16 namespace ZXing {
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18 /**
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19 * @brief The Binarizer enum
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20 *
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21 * Specify which algorithm to use for the grayscale to binary transformation.
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22 * The difference is how to get to a threshold value T which results in a bit
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23 * value R = L <= T.
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24 */
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25 enum class Binarizer : unsigned char // needs to be unsigned for the bitfield below to work, uint8_t fails as well
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26 {
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27 LocalAverage, ///< T = average of neighboring pixels for matrix and GlobalHistogram for linear (HybridBinarizer)
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28 GlobalHistogram, ///< T = valley between the 2 largest peaks in the histogram (per line in linear case)
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29 FixedThreshold, ///< T = 127
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30 BoolCast, ///< T = 0, fastest possible
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31 };
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32
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33 enum class EanAddOnSymbol : unsigned char // see above
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34 {
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35 Ignore, ///< Ignore any Add-On symbol during read/scan
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36 Read, ///< Read EAN-2/EAN-5 Add-On symbol if found
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37 Require, ///< Require EAN-2/EAN-5 Add-On symbol to be present
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38 };
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39
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40 enum class TextMode : unsigned char // see above
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41 {
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42 Plain, ///< bytes() transcoded to unicode based on ECI info or guessed charset (the default mode prior to 2.0)
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43 ECI, ///< standard content following the ECI protocol with every character set ECI segment transcoded to unicode
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44 HRI, ///< Human Readable Interpretation (dependent on the ContentType)
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45 Hex, ///< bytes() transcoded to ASCII string of HEX values
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46 Escaped, ///< Use the EscapeNonGraphical() function (e.g. ASCII 29 will be transcoded to "<GS>")
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47 };
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48
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49 class ReaderOptions
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50 {
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51 bool _tryHarder : 1;
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52 bool _tryRotate : 1;
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53 bool _tryInvert : 1;
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54 bool _tryDownscale : 1;
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55 bool _isPure : 1;
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56 bool _tryCode39ExtendedMode : 1;
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57 bool _validateCode39CheckSum : 1;
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58 bool _validateITFCheckSum : 1;
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59 bool _returnCodabarStartEnd : 1;
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60 bool _returnErrors : 1;
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61 uint8_t _downscaleFactor : 3;
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62 EanAddOnSymbol _eanAddOnSymbol : 2;
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63 Binarizer _binarizer : 2;
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64 TextMode _textMode : 3;
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65 CharacterSet _characterSet : 6;
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66 #ifdef ZXING_EXPERIMENTAL_API
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67 bool _tryDenoise : 1;
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68 #endif
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69
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70 uint8_t _minLineCount = 2;
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71 uint8_t _maxNumberOfSymbols = 0xff;
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72 uint16_t _downscaleThreshold = 500;
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73 BarcodeFormats _formats = BarcodeFormat::None;
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74
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75 public:
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76 // bitfields don't get default initialized to 0 before c++20
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77 ReaderOptions()
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78 : _tryHarder(1),
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79 _tryRotate(1),
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80 _tryInvert(1),
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81 _tryDownscale(1),
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82 _isPure(0),
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83 _tryCode39ExtendedMode(1),
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84 _validateCode39CheckSum(0),
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85 _validateITFCheckSum(0),
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86 _returnCodabarStartEnd(1),
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87 _returnErrors(0),
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88 _downscaleFactor(3),
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89 _eanAddOnSymbol(EanAddOnSymbol::Ignore),
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90 _binarizer(Binarizer::LocalAverage),
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91 _textMode(TextMode::HRI),
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92 _characterSet(CharacterSet::Unknown)
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93 #ifdef ZXING_EXPERIMENTAL_API
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94 ,
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95 _tryDenoise(0)
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96 #endif
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97 {}
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98
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99 #define ZX_PROPERTY(TYPE, GETTER, SETTER, ...) \
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100 TYPE GETTER() const noexcept { return _##GETTER; } \
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101 __VA_ARGS__ ReaderOptions& SETTER(TYPE v)& { return (void)(_##GETTER = std::move(v)), *this; } \
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102 __VA_ARGS__ ReaderOptions&& SETTER(TYPE v)&& { return (void)(_##GETTER = std::move(v)), std::move(*this); }
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103
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104 /// Specify a set of BarcodeFormats that should be searched for, the default is all supported formats.
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105 ZX_PROPERTY(BarcodeFormats, formats, setFormats)
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106
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107 /// Spend more time to try to find a barcode; optimize for accuracy, not speed.
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108 ZX_PROPERTY(bool, tryHarder, setTryHarder)
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109
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110 /// Also try detecting code in 90, 180 and 270 degree rotated images.
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111 ZX_PROPERTY(bool, tryRotate, setTryRotate)
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112
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113 /// Also try detecting inverted ("reversed reflectance") codes if the format allows for those.
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114 ZX_PROPERTY(bool, tryInvert, setTryInvert)
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115
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116 /// Also try detecting code in downscaled images (depending on image size).
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117 ZX_PROPERTY(bool, tryDownscale, setTryDownscale)
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118
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119 #ifdef ZXING_EXPERIMENTAL_API
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120 /// Also try detecting code after denoising (currently morphological closing filter for 2D symbologies only).
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121 ZX_PROPERTY(bool, tryDenoise, setTryDenoise)
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122 #endif
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123
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124 /// Binarizer to use internally when using the ReadBarcode function
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125 ZX_PROPERTY(Binarizer, binarizer, setBinarizer)
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126
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127 /// Set to true if the input contains nothing but a single perfectly aligned barcode (generated image)
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128 ZX_PROPERTY(bool, isPure, setIsPure)
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129
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130 /// Image size ( min(width, height) ) threshold at which to start downscaled scanning
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131 // WARNING: this API is experimental and may change/disappear
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132 ZX_PROPERTY(uint16_t, downscaleThreshold, setDownscaleThreshold)
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133
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134 /// Scale factor used during downscaling, meaningful values are 2, 3 and 4
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135 // WARNING: this API is experimental and may change/disappear
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136 ZX_PROPERTY(uint8_t, downscaleFactor, setDownscaleFactor)
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137
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138 /// The number of scan lines in a linear barcode that have to be equal to accept the result, default is 2
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139 ZX_PROPERTY(uint8_t, minLineCount, setMinLineCount)
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140
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141 /// The maximum number of symbols (barcodes) to detect / look for in the image with ReadBarcodes
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142 ZX_PROPERTY(uint8_t, maxNumberOfSymbols, setMaxNumberOfSymbols)
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143
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144 /// Enable the heuristic to detect and decode "full ASCII"/extended Code39 symbols
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145 ZX_PROPERTY(bool, tryCode39ExtendedMode, setTryCode39ExtendedMode)
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146
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147 /// Deprecated / does nothing. The Code39 symbol has a valid checksum iff symbologyIdentifier()[2] is an odd digit
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148 ZX_PROPERTY(bool, validateCode39CheckSum, setValidateCode39CheckSum, [[deprecated]])
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149
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150 /// Deprecated / does nothing. The ITF symbol has a valid checksum iff symbologyIdentifier()[2] == '1'.
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151 ZX_PROPERTY(bool, validateITFCheckSum, setValidateITFCheckSum, [[deprecated]])
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152
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153 /// Deprecated / does nothing. Codabar start/stop characters are always returned.
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154 ZX_PROPERTY(bool, returnCodabarStartEnd, setReturnCodabarStartEnd, [[deprecated]])
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155
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156 /// If true, return the barcodes with errors as well (e.g. checksum errors, see @Barcode::error())
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157 ZX_PROPERTY(bool, returnErrors, setReturnErrors)
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158
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159 /// Specify whether to ignore, read or require EAN-2/5 add-on symbols while scanning EAN/UPC codes
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160 ZX_PROPERTY(EanAddOnSymbol, eanAddOnSymbol, setEanAddOnSymbol)
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161
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162 /// Specifies the TextMode that controls the return of the Barcode::text() function
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163 ZX_PROPERTY(TextMode, textMode, setTextMode)
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164
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165 /// Specifies fallback character set to use instead of auto-detecting it (when applicable)
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166 ZX_PROPERTY(CharacterSet, characterSet, setCharacterSet)
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167 ReaderOptions& setCharacterSet(std::string_view v)& { return (void)(_characterSet = CharacterSetFromString(v)), *this; }
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168 ReaderOptions&& setCharacterSet(std::string_view v) && { return (void)(_characterSet = CharacterSetFromString(v)), std::move(*this); }
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169
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170 #undef ZX_PROPERTY
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171
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172 bool hasFormat(BarcodeFormats f) const noexcept { return _formats.testFlags(f) || _formats.empty(); }
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173 };
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174
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175 #ifndef HIDE_DECODE_HINTS_ALIAS
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176 using DecodeHints [[deprecated]] = ReaderOptions;
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177 #endif
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178
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179 } // ZXing