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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Flibwebp%2F'>libwebp</a>/<a href='?path=%2Fbig%2FSRC%2Flibwebp%2Fwebp_js%2F'>webp_js</a>/</p><hr><h3>✏️ Editing: README.md</h3>  
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            <textarea name='content' rows='20'># WebP JavaScript decoder

```
 __   __ ____ ____ ____     __  ____
/  \\/  \  _ \  _ \  _ \   (__)/  __\
\       /  __/ _  \  __/   _)  \_   \
 \__\__/_____/____/_/     /____/____/
```

This file describes the compilation of libwebp into a JavaScript decoder using
Emscripten and CMake.

-   install the Emscripten SDK following the procedure described at:
    https://emscripten.org/docs/getting_started/downloads.html#installation-instructions-using-the-emsdk-recommended
    After installation, you should have some global variable positioned to the
    location of the SDK. In particular, `$EMSDK` should point to the top-level
    directory containing Emscripten tools.

-   configure the project &#039;WEBP_JS&#039; with CMake using:

    ```shell
    cd webp_js &amp;&amp; embuilder build sdl2 &amp;&amp; \
    emcmake cmake -DWEBP_BUILD_WEBP_JS=ON ../
    ```

-   compile webp.js using `emmake make`.

-   that&#039;s it! Upon completion, you should have the &#039;webp.js&#039;, &#039;webp.js.mem&#039;,
    &#039;webp_wasm.js&#039; and &#039;webp_wasm.wasm&#039; files generated.

The callable JavaScript function is `WebPToSDL()`, which decodes a raw WebP
bitstream into a canvas. See webp_js/index.html for a simple usage sample (see
below for instructions).

## Demo HTML page

The HTML page webp_js/index.html requires the built files &#039;webp.js&#039; and
&#039;webp.js.mem&#039; to be copied to webp_js/. An HTTP server to serve the WebP image
example is also needed. With Python, just run:

```shell
cd webp_js &amp;&amp; python3 -m http.server 8080
```

and then navigate to http://localhost:8080 in your favorite browser.

## Web-Assembly (WASM) version:

CMakeLists.txt is configured to build the WASM version when using the option
WEBP_BUILD_WEBP_JS=ON. The compilation step will assemble the files
&#039;webp_wasm.js&#039; and &#039;webp_wasm.wasm&#039; that you then need to copy to the webp_js/
directory.

See webp_js/index_wasm.html for a simple demo page using the WASM version of the
library.

## Caveats

-   First decoding using the library is usually slower, due to just-in-time
    compilation.
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