Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/wrappers/wasm/BarcodeReader.cpp @ 12:fdb709369d57

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author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 17 Sep 2025 15:31:57 +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 2023 Axel Waggershauser
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4 */
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5 // SPDX-License-Identifier: Apache-2.0
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7 #include "ReadBarcode.h"
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8
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9 #include <emscripten/bind.h>
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10 #include <emscripten/val.h>
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11 #include <memory>
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12 #include <stdexcept>
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13 #include <string>
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14
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15 #define STB_IMAGE_IMPLEMENTATION
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16 #include <stb_image.h>
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18 using namespace ZXing;
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20 struct ReadResult
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21 {
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22 std::string format{};
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23 std::string text{};
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24 emscripten::val bytes;
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25 std::string error{};
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26 Position position{};
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27 std::string symbologyIdentifier{};
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28 };
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29
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30 std::vector<ReadResult> readBarcodes(ImageView iv, bool tryHarder, const std::string& format, int maxSymbols)
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31 {
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32 try {
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33 ReaderOptions opts;
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34 opts.setTryHarder(tryHarder);
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35 opts.setTryRotate(tryHarder);
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36 opts.setTryInvert(tryHarder);
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37 opts.setTryDownscale(tryHarder);
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38 opts.setFormats(BarcodeFormatsFromString(format));
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39 opts.setMaxNumberOfSymbols(maxSymbols);
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40 // opts.setReturnErrors(maxSymbols > 1);
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41
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42 auto barcodes = ReadBarcodes(iv, opts);
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43
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44 std::vector<ReadResult> readResults{};
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45 readResults.reserve(barcodes.size());
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47 thread_local const emscripten::val Uint8Array = emscripten::val::global("Uint8Array");
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48
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49 for (auto&& barcode : barcodes) {
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50 const ByteArray& bytes = barcode.bytes();
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51 readResults.push_back({
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52 ToString(barcode.format()),
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53 barcode.text(),
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54 Uint8Array.new_(emscripten::typed_memory_view(bytes.size(), bytes.data())),
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55 ToString(barcode.error()),
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56 barcode.position(),
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57 barcode.symbologyIdentifier()
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58 });
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59 }
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60
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61 return readResults;
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62 } catch (const std::exception& e) {
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63 return {{"", "", {}, e.what()}};
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64 } catch (...) {
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65 return {{"", "", {}, "Unknown error"}};
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66 }
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67 return {};
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68 }
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69
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70 std::vector<ReadResult> readBarcodesFromImage(int bufferPtr, int bufferLength, bool tryHarder, std::string format, int maxSymbols)
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71 {
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72 int width, height, channels;
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73 std::unique_ptr<stbi_uc, void (*)(void*)> buffer(
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74 stbi_load_from_memory(reinterpret_cast<const unsigned char*>(bufferPtr), bufferLength, &width, &height, &channels, 1),
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75 stbi_image_free);
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76 if (buffer == nullptr)
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77 return {{"", "", {}, "Error loading image"}};
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78
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79 return readBarcodes({buffer.get(), width, height, ImageFormat::Lum}, tryHarder, format, maxSymbols);
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80 }
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81
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82 ReadResult readBarcodeFromImage(int bufferPtr, int bufferLength, bool tryHarder, std::string format)
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83 {
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84 return FirstOrDefault(readBarcodesFromImage(bufferPtr, bufferLength, tryHarder, format, 1));
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85 }
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86
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87 std::vector<ReadResult> readBarcodesFromPixmap(int bufferPtr, int imgWidth, int imgHeight, bool tryHarder, std::string format, int maxSymbols)
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88 {
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89 return readBarcodes({reinterpret_cast<uint8_t*>(bufferPtr), imgWidth, imgHeight, ImageFormat::RGBA}, tryHarder, format, maxSymbols);
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90 }
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91
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92 ReadResult readBarcodeFromPixmap(int bufferPtr, int imgWidth, int imgHeight, bool tryHarder, std::string format)
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93 {
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94 return FirstOrDefault(readBarcodesFromPixmap(bufferPtr, imgWidth, imgHeight, tryHarder, format, 1));
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95 }
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97 EMSCRIPTEN_BINDINGS(BarcodeReader)
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98 {
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99 using namespace emscripten;
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100
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101 value_object<ReadResult>("ReadResult")
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102 .field("format", &ReadResult::format)
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103 .field("text", &ReadResult::text)
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104 .field("bytes", &ReadResult::bytes)
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105 .field("error", &ReadResult::error)
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106 .field("position", &ReadResult::position)
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107 .field("symbologyIdentifier", &ReadResult::symbologyIdentifier);
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108
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109 value_object<ZXing::PointI>("Point").field("x", &ZXing::PointI::x).field("y", &ZXing::PointI::y);
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110
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111 value_object<ZXing::Position>("Position")
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112 .field("topLeft", emscripten::index<0>())
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113 .field("topRight", emscripten::index<1>())
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114 .field("bottomRight", emscripten::index<2>())
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115 .field("bottomLeft", emscripten::index<3>());
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116
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117 register_vector<ReadResult>("vector<ReadResult>");
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118
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119 function("readBarcodeFromImage", &readBarcodeFromImage);
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120 function("readBarcodeFromPixmap", &readBarcodeFromPixmap);
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121
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122 function("readBarcodesFromImage", &readBarcodesFromImage);
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123 function("readBarcodesFromPixmap", &readBarcodesFromPixmap);
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124 };