Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/wrappers/wasm/BarcodeWriter.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 2016 Nu-book Inc.
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3 */
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4 // SPDX-License-Identifier: Apache-2.0
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5
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6 #include "BarcodeFormat.h"
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7 #include "MultiFormatWriter.h"
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8 #include "BitMatrix.h"
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9 #include "CharacterSet.h"
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10
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11 #include <string>
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12 #include <memory>
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13 #include <exception>
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14 #include <emscripten/bind.h>
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15 #include <emscripten/val.h>
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17 #define STB_IMAGE_WRITE_IMPLEMENTATION
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18 #include <stb_image_write.h>
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20 class ImageData
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21 {
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22 public:
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23 uint8_t* const buffer;
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24 const int length;
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26 ImageData(uint8_t* buf, int len) : buffer(buf), length(len) {}
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27 ~ImageData() { STBIW_FREE(buffer); }
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28 };
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30 class WriteResult
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31 {
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32 std::shared_ptr<ImageData> _image;
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33 std::string _error;
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34
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35 public:
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36 WriteResult(const std::shared_ptr<ImageData>& image) : _image(image) {}
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37 WriteResult(std::string error) : _error(std::move(error)) {}
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38
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39 std::string error() const { return _error; }
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41 emscripten::val image() const
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42 {
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43 if (_image != nullptr)
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44 return emscripten::val(emscripten::typed_memory_view(_image->length, _image->buffer));
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45 else
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46 return emscripten::val::null();
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47 }
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48 };
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49
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50 WriteResult generateBarcode(std::wstring text, std::string format, std::string encoding, int margin, int width, int height, int eccLevel)
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51 {
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52 using namespace ZXing;
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53 try {
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54 auto barcodeFormat = BarcodeFormatFromString(format);
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55 if (barcodeFormat == BarcodeFormat::None)
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56 return {"Unsupported format: " + format};
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57
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58 MultiFormatWriter writer(barcodeFormat);
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59 if (margin >= 0)
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60 writer.setMargin(margin);
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61
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62 CharacterSet charset = CharacterSetFromString(encoding);
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63 if (charset != CharacterSet::Unknown)
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64 writer.setEncoding(charset);
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66 if (eccLevel >= 0 && eccLevel <= 8)
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67 writer.setEccLevel(eccLevel);
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69 auto buffer = ToMatrix<uint8_t>(writer.encode(text, width, height));
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71 int len;
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72 uint8_t* bytes = stbi_write_png_to_mem(buffer.data(), 0, buffer.width(), buffer.height(), 1, &len);
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73 if (bytes == nullptr)
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74 return {"Unknown error"};
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75
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76 return {std::make_shared<ImageData>(bytes, len)};
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77 } catch (const std::exception& e) {
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78 return {e.what()};
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79 } catch (...) {
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80 return {"Unknown error"};
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81 }
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82 }
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83
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84 EMSCRIPTEN_BINDINGS(BarcodeWriter)
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85 {
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86 using namespace emscripten;
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87
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88 class_<WriteResult>("WriteResult")
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89 .property("image", &WriteResult::image)
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90 .property("error", &WriteResult::error)
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91 ;
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92
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93 function("generateBarcode", &generateBarcode);
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94 }