annotate mupdf-source/thirdparty/zxing-cpp/core/src/ReadBarcode.cpp @ 21:2f43e400f144

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 * Copyright 2019 Axel Waggershauser
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3 */
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4 // SPDX-License-Identifier: Apache-2.0
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6 #include "ReadBarcode.h"
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8 #if !defined(ZXING_READERS) && !defined(ZXING_WRITERS)
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9 #include "Version.h"
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10 #endif
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12 #ifdef ZXING_READERS
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13 #include "GlobalHistogramBinarizer.h"
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14 #include "HybridBinarizer.h"
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15 #include "MultiFormatReader.h"
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16 #include "Pattern.h"
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17 #include "ThresholdBinarizer.h"
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18 #endif
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20 #include <climits>
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21 #include <memory>
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22 #include <stdexcept>
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24 namespace ZXing {
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26 #ifdef ZXING_READERS
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28 class LumImage : public Image
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29 {
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30 public:
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31 using Image::Image;
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33 uint8_t* data() { return const_cast<uint8_t*>(Image::data()); }
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34 };
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36 template<typename P>
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37 static LumImage ExtractLum(const ImageView& iv, P projection)
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38 {
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39 LumImage res(iv.width(), iv.height());
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41 auto* dst = res.data();
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42 for(int y = 0; y < iv.height(); ++y)
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43 for(int x = 0, w = iv.width(); x < w; ++x)
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44 *dst++ = projection(iv.data(x, y));
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46 return res;
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47 }
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48
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49 class LumImagePyramid
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50 {
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51 std::vector<LumImage> buffers;
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53 template<int N>
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54 void addLayer()
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55 {
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56 auto siv = layers.back();
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57 buffers.emplace_back(siv.width() / N, siv.height() / N);
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58 layers.push_back(buffers.back());
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59 auto& div = buffers.back();
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60 auto* d = div.data();
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61
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62 for (int dy = 0; dy < div.height(); ++dy)
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63 for (int dx = 0; dx < div.width(); ++dx) {
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64 int sum = (N * N) / 2;
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65 for (int ty = 0; ty < N; ++ty)
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66 for (int tx = 0; tx < N; ++tx)
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67 sum += *siv.data(dx * N + tx, dy * N + ty);
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68 *d++ = sum / (N * N);
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69 }
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70 }
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71
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72 void addLayer(int factor)
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73 {
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74 // help the compiler's auto-vectorizer by hard-coding the scale factor
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75 switch (factor) {
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76 case 2: addLayer<2>(); break;
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77 case 3: addLayer<3>(); break;
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78 case 4: addLayer<4>(); break;
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79 default: throw std::invalid_argument("Invalid ReaderOptions::downscaleFactor"); break;
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80 }
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81 }
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82
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83 public:
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84 std::vector<ImageView> layers;
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85
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86 LumImagePyramid(const ImageView& iv, int threshold, int factor)
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87 {
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88 if (factor < 2)
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89 throw std::invalid_argument("Invalid ReaderOptions::downscaleFactor");
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90
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91 layers.push_back(iv);
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92 // TODO: if only matrix codes were considered, then using std::min would be sufficient (see #425)
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93 while (threshold > 0 && std::max(layers.back().width(), layers.back().height()) > threshold &&
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94 std::min(layers.back().width(), layers.back().height()) >= factor)
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95 addLayer(factor);
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96 #if 0
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97 // Reversing the layers means we'd start with the smallest. that can make sense if we are only looking for a
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98 // single symbol. If we start with the higher resolution, we get better (high res) position information.
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99 // TODO: see if masking out higher res layers based on found symbols in lower res helps overall performance.
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100 std::reverse(layers.begin(), layers.end());
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101 #endif
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102 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 };
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parents:
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104
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 ImageView SetupLumImageView(ImageView iv, LumImage& lum, const ReaderOptions& opts)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 {
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parents:
diff changeset
107 if (iv.format() == ImageFormat::None)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 throw std::invalid_argument("Invalid image format");
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parents:
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109
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 if (opts.binarizer() == Binarizer::GlobalHistogram || opts.binarizer() == Binarizer::LocalAverage) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 // manually spell out the 3 most common pixel formats to get at least gcc to vectorize the code
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 if (iv.format() == ImageFormat::RGB && iv.pixStride() == 3) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 lum = ExtractLum(iv, [](const uint8_t* src) { return RGBToLum(src[0], src[1], src[2]); });
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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114 } else if (iv.format() == ImageFormat::RGBA && iv.pixStride() == 4) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 lum = ExtractLum(iv, [](const uint8_t* src) { return RGBToLum(src[0], src[1], src[2]); });
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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116 } else if (iv.format() == ImageFormat::BGR && iv.pixStride() == 3) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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117 lum = ExtractLum(iv, [](const uint8_t* src) { return RGBToLum(src[2], src[1], src[0]); });
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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118 } else if (iv.format() != ImageFormat::Lum) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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119 lum = ExtractLum(iv, [r = RedIndex(iv.format()), g = GreenIndex(iv.format()), b = BlueIndex(iv.format())](
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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120 const uint8_t* src) { return RGBToLum(src[r], src[g], src[b]); });
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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121 } else if (iv.pixStride() != 1) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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122 // GlobalHistogram and LocalAverage need dense line memory layout
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 lum = ExtractLum(iv, [](const uint8_t* src) { return *src; });
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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125 if (lum.data())
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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126 return lum;
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parents:
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127 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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128 return iv;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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129 }
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parents:
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130
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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131 std::unique_ptr<BinaryBitmap> CreateBitmap(ZXing::Binarizer binarizer, const ImageView& iv)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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132 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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133 switch (binarizer) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 case Binarizer::BoolCast: return std::make_unique<ThresholdBinarizer>(iv, 0);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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135 case Binarizer::FixedThreshold: return std::make_unique<ThresholdBinarizer>(iv, 127);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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136 case Binarizer::GlobalHistogram: return std::make_unique<GlobalHistogramBinarizer>(iv);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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137 case Binarizer::LocalAverage: return std::make_unique<HybridBinarizer>(iv);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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138 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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139 return {}; // silence gcc warning
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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140 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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141
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 Barcode ReadBarcode(const ImageView& _iv, const ReaderOptions& opts)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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144 return FirstOrDefault(ReadBarcodes(_iv, ReaderOptions(opts).setMaxNumberOfSymbols(1)));
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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145 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 Barcodes ReadBarcodes(const ImageView& _iv, const ReaderOptions& opts)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
149 if (sizeof(PatternType) < 4 && (_iv.width() > 0xffff || _iv.height() > 0xffff))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 throw std::invalid_argument("Maximum image width/height is 65535");
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parents:
diff changeset
151
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 if (!_iv.data() || _iv.width() * _iv.height() == 0)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 throw std::invalid_argument("ImageView is null/empty");
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parents:
diff changeset
154
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 LumImage lum;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 ImageView iv = SetupLumImageView(_iv, lum, opts);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 MultiFormatReader reader(opts);
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parents:
diff changeset
158
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 if (opts.isPure())
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 return {reader.read(*CreateBitmap(opts.binarizer(), iv)).setReaderOptions(opts)};
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 std::unique_ptr<MultiFormatReader> closedReader;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 #ifdef ZXING_EXPERIMENTAL_API
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 auto formatsBenefittingFromClosing = BarcodeFormat::Aztec | BarcodeFormat::DataMatrix | BarcodeFormat::QRCode | BarcodeFormat::MicroQRCode;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 ReaderOptions closedOptions = opts;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 if (opts.tryDenoise() && opts.hasFormat(formatsBenefittingFromClosing) && _iv.height() >= 3) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 closedOptions.setFormats((opts.formats().empty() ? BarcodeFormat::Any : opts.formats()) & formatsBenefittingFromClosing);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 closedReader = std::make_unique<MultiFormatReader>(closedOptions);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 #endif
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 LumImagePyramid pyramid(iv, opts.downscaleThreshold() * opts.tryDownscale(), opts.downscaleFactor());
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 Barcodes res;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 int maxSymbols = opts.maxNumberOfSymbols() ? opts.maxNumberOfSymbols() : INT_MAX;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 for (auto&& iv : pyramid.layers) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 auto bitmap = CreateBitmap(opts.binarizer(), iv);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 for (int close = 0; close <= (closedReader ? 1 : 0); ++close) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 if (close)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 bitmap->close();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 // TODO: check if closing after invert would be beneficial
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 for (int invert = 0; invert <= static_cast<int>(opts.tryInvert() && !close); ++invert) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 if (invert)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 bitmap->invert();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 auto rs = (close ? *closedReader : reader).readMultiple(*bitmap, maxSymbols);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 for (auto& r : rs) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 if (iv.width() != _iv.width())
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 r.setPosition(Scale(r.position(), _iv.width() / iv.width()));
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 if (!Contains(res, r)) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 r.setReaderOptions(opts);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 r.setIsInverted(bitmap->inverted());
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 res.push_back(std::move(r));
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 --maxSymbols;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 if (maxSymbols <= 0)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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197 return res;
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198 }
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199 }
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200 }
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201
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202 return res;
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203 }
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204
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205 #else // ZXING_READERS
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206
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207 Barcode ReadBarcode(const ImageView&, const ReaderOptions&)
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208 {
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209 throw std::runtime_error("This build of zxing-cpp does not support reading barcodes.");
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210 }
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211
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212 Barcodes ReadBarcodes(const ImageView&, const ReaderOptions&)
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213 {
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214 throw std::runtime_error("This build of zxing-cpp does not support reading barcodes.");
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215 }
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216
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217 #endif // ZXING_READERS
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218
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219 } // ZXing