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LibGfx+LibWeb: Add JPEG decoder and integrate with LibWeb

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This patch adds support for JPEG decoding. The JPEG decoder is capable
of handling standard 2x1 horizontal, 2x1 vertical and quartered chroma
subsampling. The implemented Inverse DCT performs with a decent speed.

As of interchange formats, since we tend to ignore the metadata in APPn
markers, the decoder can handle any format compatible with JFIF, which
includes EXIFs and sometimes WebMs too. The decoder does not support
progressive JPEGs yet.
This commit is contained in:
Devashish 2020-05-18 13:28:27 +05:30 • committed by Andreas Kling
parent 10255bc5c6
commit 8b71b839fa
12 changed files with 1301 additions and 8 deletions
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23
Base/res/html/misc/jpg.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Pretty JPEG Pictures</title>
</head>
<body>
<div>
<h3>Non-subsampled Lena</h3> <br>
<img alt="lena" src="jpgsuite_files/non-subsampled-lena.jpg"/> <br>
<h3>Chroma Horizontally Halved Lena</h3> <br>
<img alt="lena" src="jpgsuite_files/horizontally-halved-lena.jpg"/> <br>
<h3>Chroma Vertically Halved Lena</h3> <br>
<img alt="lena" src="jpgsuite_files/vertically-halved-lena.jpg"/> <br>
<h3>Chroma Quartered Lena</h3> <br>
<img alt="lena" src="jpgsuite_files/chroma-quartered-lena.jpg"/><br>
</div>
<div>
<h3>Oh Lena!</h3> <br>
<img alt="lena" src="jpgsuite_files/oh-lena.jpg"/>
</div>
</body>
</html>

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1
Base/res/html/misc/welcome.html
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@ -34,6 +34,7 @@ span#ua {
<li><a href="iframe.html">iframe</a></li>
<li><a href="many-buggies.html">many buggies</a></li>
<li><a href="bmpsuite.html">BMP test suite</a></li>
<li><a href="jpg.html">JPG Images</a></li>
<li><a href="palette.html">system palette color css extension</a></li>
<li><a href="inline-block-link.html">link inside display: inline-block</a></li>
<li><a href="set-interval.html">setInterval() test</a></li>