--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/zxing-cpp/core/src/ThresholdBinarizer.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,58 @@
+/*
+* Copyright 2020 Axel Waggershauser
+*/
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include "BinaryBitmap.h"
+#include "BitMatrix.h"
+
+#include <cstdint>
+
+namespace ZXing {
+
+class ThresholdBinarizer : public BinaryBitmap
+{
+	const uint8_t _threshold = 0;
+
+public:
+	ThresholdBinarizer(const ImageView& buffer, uint8_t threshold = 128) : BinaryBitmap(buffer), _threshold(threshold) {}
+
+	bool getPatternRow(int row, int rotation, PatternRow& res) const override
+	{
+		auto buffer = _buffer.rotated(rotation);
+
+		const int stride = buffer.pixStride();
+		const uint8_t* begin = buffer.data(0, row) + GreenIndex(buffer.format());
+		const uint8_t* end = begin + buffer.width() * stride;
+
+		auto* lastPos = begin;
+		bool lastVal = false;
+
+		res.clear();
+
+		for (const uint8_t* p = begin; p != end; p += stride) {
+			bool val = *p <= _threshold;
+			if (val != lastVal) {
+				res.push_back(narrow_cast<PatternRow::value_type>((p - lastPos) / stride));
+				lastVal = val;
+				lastPos = p;
+			}
+		}
+
+		res.push_back(narrow_cast<PatternRow::value_type>((end - lastPos) / stride));
+
+		if (*(end - stride) <= _threshold)
+			res.push_back(0); // last value is number of white pixels, here 0
+
+		return true;
+	}
+
+	std::shared_ptr<const BitMatrix> getBlackMatrix() const override
+	{
+		return std::make_shared<const BitMatrix>(binarize(_threshold));
+	}
+};
+
+} // ZXing