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annotate mupdf-source/thirdparty/zxing-cpp/wrappers/wasm/README.md @ 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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b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 # WebAssembly/WASM Wrapper
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3 ## Build
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5 1. [Install Emscripten](https://kripken.github.io/emscripten-site/docs/getting_started/) if not done already.
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6 2. In an empty build folder, invoke `emcmake cmake <path to zxing-cpp.git/wrappers/wasm>`.
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7 3. Invoke `cmake --build .` to create `zxing.js` and `zxing.wasm` (and `_reader`/`_writer` versions).
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8 4. To see how to include these into a working HTML page, have a look at the [reader](demo_reader.html), [writer](demo_writer.html) and [cam reader](demo_cam_reader.html) demos.
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9 5. To quickly test your build, copy those demo files into your build directory and run e.g. `emrun --serve_after_close demo_reader.html`.
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11 You can also download the latest build output from the continuous integration system from the [Actions](https://github.com/zxing-cpp/zxing-cpp/actions) tab. Look for 'wasm-artifacts'. Also check out the [live demos](https://github.com/zxing-cpp/zxing-cpp#web-demos).
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13 ## Alternative Wrapper Project
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15 There is an alternative (external) wrapper project called [zxing-wasm](https://github.com/Sec-ant/zxing-wasm). It is written in TypeScript, has a more feature complete interface closer to the C++ API, spares you from dealing with WASM intricacies and is provided as a fully fledged ES module on [npmjs](https://www.npmjs.com/package/zxing-wasm).
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17 ## Performance
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19 It turns out that compiling the library with the `-Os` (`MinSizeRel`) flag causes a noticible performance penalty. Here are some measurements from the demo_cam_reader (performed on Chromium 109 running on a Core i9-9980HK):
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21 | | `-Os` | `-Os -flto` | `-O3` | `-O3 -flto` | _Build system_ |
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22 |---------|-------|-------------|--------|-------------|-|
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23 | size | 790kB | 950kb | 940kb | 1000kB | _All_ |
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24 | runtime | 320ms | 30ms | 8ms | 8ms | C++17, emsdk 3.1.9 |
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25 | runtime | 13ms | 30ms | 8ms | 8ms | C++17, emsdk 3.1.31 |
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26 | runtime | 46ms | 46ms | 11ms | 11ms | C++20, emsdk 3.1.31 |
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28 Conclusions:
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29 * saving 15% of download size for the price of a 2x-4x slowdown seems like a hard sale (let alone the 40x one)...
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30 * building in C++-20 mode brings position independent DataMatrix detection but costs 35% more time
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31 * link time optimization (`-flto`) is not worth it and potentially even counter productive
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