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comparison mupdf-source/thirdparty/zxing-cpp/wrappers/wasm/BarcodeWriter.cpp @ 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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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * Copyright 2016 Nu-book Inc.
3 */
4 // SPDX-License-Identifier: Apache-2.0
5
6 #include "BarcodeFormat.h"
7 #include "MultiFormatWriter.h"
8 #include "BitMatrix.h"
9 #include "CharacterSet.h"
10
11 #include <string>
12 #include <memory>
13 #include <exception>
14 #include <emscripten/bind.h>
15 #include <emscripten/val.h>
16
17 #define STB_IMAGE_WRITE_IMPLEMENTATION
18 #include <stb_image_write.h>
19
20 class ImageData
21 {
22 public:
23 uint8_t* const buffer;
24 const int length;
25
26 ImageData(uint8_t* buf, int len) : buffer(buf), length(len) {}
27 ~ImageData() { STBIW_FREE(buffer); }
28 };
29
30 class WriteResult
31 {
32 std::shared_ptr<ImageData> _image;
33 std::string _error;
34
35 public:
36 WriteResult(const std::shared_ptr<ImageData>& image) : _image(image) {}
37 WriteResult(std::string error) : _error(std::move(error)) {}
38
39 std::string error() const { return _error; }
40
41 emscripten::val image() const
42 {
43 if (_image != nullptr)
44 return emscripten::val(emscripten::typed_memory_view(_image->length, _image->buffer));
45 else
46 return emscripten::val::null();
47 }
48 };
49
50 WriteResult generateBarcode(std::wstring text, std::string format, std::string encoding, int margin, int width, int height, int eccLevel)
51 {
52 using namespace ZXing;
53 try {
54 auto barcodeFormat = BarcodeFormatFromString(format);
55 if (barcodeFormat == BarcodeFormat::None)
56 return {"Unsupported format: " + format};
57
58 MultiFormatWriter writer(barcodeFormat);
59 if (margin >= 0)
60 writer.setMargin(margin);
61
62 CharacterSet charset = CharacterSetFromString(encoding);
63 if (charset != CharacterSet::Unknown)
64 writer.setEncoding(charset);
65
66 if (eccLevel >= 0 && eccLevel <= 8)
67 writer.setEccLevel(eccLevel);
68
69 auto buffer = ToMatrix<uint8_t>(writer.encode(text, width, height));
70
71 int len;
72 uint8_t* bytes = stbi_write_png_to_mem(buffer.data(), 0, buffer.width(), buffer.height(), 1, &len);
73 if (bytes == nullptr)
74 return {"Unknown error"};
75
76 return {std::make_shared<ImageData>(bytes, len)};
77 } catch (const std::exception& e) {
78 return {e.what()};
79 } catch (...) {
80 return {"Unknown error"};
81 }
82 }
83
84 EMSCRIPTEN_BINDINGS(BarcodeWriter)
85 {
86 using namespace emscripten;
87
88 class_<WriteResult>("WriteResult")
89 .property("image", &WriteResult::image)
90 .property("error", &WriteResult::error)
91 ;
92
93 function("generateBarcode", &generateBarcode);
94 }