Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/BinaryBitmap.cpp @ 20:eb3dd22fef2c

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FIX: the new "sdist" build target is PHONY also
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 22:04:13 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2020 Axel Waggershauser
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3 */
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4 // SPDX-License-Identifier: Apache-2.0
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6 #include "BinaryBitmap.h"
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8 #include "BitMatrix.h"
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10 #include <mutex>
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12 namespace ZXing {
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14 struct BinaryBitmap::Cache
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15 {
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16 std::once_flag once;
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17 std::shared_ptr<const BitMatrix> matrix;
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18 };
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20 BitMatrix BinaryBitmap::binarize(const uint8_t threshold) const
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21 {
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22 BitMatrix res(width(), height());
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24 if (_buffer.pixStride() == 1 && _buffer.rowStride() == _buffer.width()) {
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25 // Specialize for a packed buffer with pixStride 1 to support auto vectorization (16x speedup on AVX2)
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26 auto dst = res.row(0).begin();
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27 for (auto src = _buffer.data(0, 0), end = _buffer.data(0, height()); src != end; ++src, ++dst)
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28 *dst = (*src <= threshold) * BitMatrix::SET_V;
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29 } else {
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30 auto processLine = [&res, threshold](int y, const auto* src, const int stride) {
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31 for (auto& dst : res.row(y)) {
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32 dst = (*src <= threshold) * BitMatrix::SET_V;
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33 src += stride;
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34 }
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35 };
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36 for (int y = 0; y < res.height(); ++y) {
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37 auto src = _buffer.data(0, y) + GreenIndex(_buffer.format());
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38 // Specialize the inner loop for strides 1 and 4 to support auto vectorization
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39 switch (_buffer.pixStride()) {
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40 case 1: processLine(y, src, 1); break;
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41 case 4: processLine(y, src, 4); break;
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42 default: processLine(y, src, _buffer.pixStride()); break;
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43 }
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44 }
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45 }
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47 return res;
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48 }
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50 BinaryBitmap::BinaryBitmap(const ImageView& buffer) : _cache(new Cache), _buffer(buffer) {}
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52 BinaryBitmap::~BinaryBitmap() = default;
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54 const BitMatrix* BinaryBitmap::getBitMatrix() const
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55 {
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56 std::call_once(_cache->once, [&](){_cache->matrix = getBlackMatrix();});
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57 return _cache->matrix.get();
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58 }
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60 void BinaryBitmap::invert()
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61 {
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62 if (_cache->matrix) {
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63 auto matrix = const_cast<BitMatrix*>(_cache->matrix.get());
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64 matrix->flipAll();
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65 }
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66 _inverted = true;
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67 }
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69 template <typename F>
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70 void SumFilter(const BitMatrix& in, BitMatrix& out, F func)
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71 {
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72 assert(in.height() >= 3);
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74 const auto* in0 = in.row(0).begin();
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75 const auto* in1 = in.row(1).begin();
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76 const auto* in2 = in.row(2).begin();
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78 for (auto *out1 = out.row(1).begin() + 1, *end = out.row(out.height() - 1).begin() - 1; out1 != end; ++in0, ++in1, ++in2, ++out1) {
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79 int sum = 0;
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80 for (int j = 0; j < 3; ++j)
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81 sum += in0[j] + in1[j] + in2[j];
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83 *out1 = func(sum);
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84 }
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85 }
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87 void BinaryBitmap::close()
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88 {
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89 if (_cache->matrix) {
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90 auto& matrix = *const_cast<BitMatrix*>(_cache->matrix.get());
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91 BitMatrix tmp(matrix.width(), matrix.height());
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92
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93 // dilate
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94 SumFilter(matrix, tmp, [](int sum) { return (sum > 0 * BitMatrix::SET_V) * BitMatrix::SET_V; });
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95 // erode
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96 SumFilter(tmp, matrix, [](int sum) { return (sum == 9 * BitMatrix::SET_V) * BitMatrix::SET_V; });
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97 }
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98 _closed = true;
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99 }
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
100
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
101 } // ZXing