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comparison mupdf-source/thirdparty/zxing-cpp/example/ZXingOpenCV.h @ 3:2c135c81b16c

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MERGE: upstream PyMuPDF 1.26.4 with MuPDF 1.26.7
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:44:09 +0200
parents b50eed0cc0ef
children
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0:6015a75abc2d 3:2c135c81b16c
1 /*
2 * Copyright 2020 Axel Waggershauser
3 */
4 // SPDX-License-Identifier: Apache-2.0
5
6 #pragma once
7
8 #include "ReadBarcode.h"
9
10 #include <opencv2/opencv.hpp>
11
12 inline ZXing::ImageView ImageViewFromMat(const cv::Mat& image)
13 {
14 using ZXing::ImageFormat;
15
16 auto fmt = ImageFormat::None;
17 switch (image.channels()) {
18 case 1: fmt = ImageFormat::Lum; break;
19 case 2: fmt = ImageFormat::LumA; break;
20 case 3: fmt = ImageFormat::BGR; break;
21 case 4: fmt = ImageFormat::BGRA; break;
22 }
23
24 if (image.depth() != CV_8U || fmt == ImageFormat::None)
25 return {nullptr, 0, 0, ImageFormat::None};
26
27 return {image.data, image.cols, image.rows, fmt};
28 }
29
30 inline ZXing::Barcodes ReadBarcodes(const cv::Mat& image, const ZXing::ReaderOptions& options = {})
31 {
32 return ZXing::ReadBarcodes(ImageViewFromMat(image), options);
33 }
34
35 inline void DrawBarcode(cv::Mat& img, ZXing::Barcode barcode)
36 {
37 auto pos = barcode.position();
38 auto zx2cv = [](ZXing::PointI p) { return cv::Point(p.x, p.y); };
39 auto contour = std::vector<cv::Point>{zx2cv(pos[0]), zx2cv(pos[1]), zx2cv(pos[2]), zx2cv(pos[3])};
40 const auto* pts = contour.data();
41 int npts = contour.size();
42
43 cv::polylines(img, &pts, &npts, 1, true, CV_RGB(0, 255, 0));
44 cv::putText(img, barcode.text(), zx2cv(pos[3]) + cv::Point(0, 20), cv::FONT_HERSHEY_DUPLEX, 0.5, CV_RGB(0, 255, 0));
45 }