Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/ThresholdBinarizer.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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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 #pragma once
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8 #include "BinaryBitmap.h"
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9 #include "BitMatrix.h"
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11 #include <cstdint>
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13 namespace ZXing {
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15 class ThresholdBinarizer : public BinaryBitmap
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16 {
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17 const uint8_t _threshold = 0;
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19 public:
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20 ThresholdBinarizer(const ImageView& buffer, uint8_t threshold = 128) : BinaryBitmap(buffer), _threshold(threshold) {}
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22 bool getPatternRow(int row, int rotation, PatternRow& res) const override
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23 {
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24 auto buffer = _buffer.rotated(rotation);
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26 const int stride = buffer.pixStride();
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27 const uint8_t* begin = buffer.data(0, row) + GreenIndex(buffer.format());
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28 const uint8_t* end = begin + buffer.width() * stride;
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30 auto* lastPos = begin;
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31 bool lastVal = false;
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33 res.clear();
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35 for (const uint8_t* p = begin; p != end; p += stride) {
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36 bool val = *p <= _threshold;
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37 if (val != lastVal) {
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38 res.push_back(narrow_cast<PatternRow::value_type>((p - lastPos) / stride));
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39 lastVal = val;
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40 lastPos = p;
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41 }
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42 }
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44 res.push_back(narrow_cast<PatternRow::value_type>((end - lastPos) / stride));
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46 if (*(end - stride) <= _threshold)
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47 res.push_back(0); // last value is number of white pixels, here 0
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49 return true;
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50 }
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52 std::shared_ptr<const BitMatrix> getBlackMatrix() const override
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53 {
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54 return std::make_shared<const BitMatrix>(binarize(_threshold));
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55 }
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56 };
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58 } // ZXing