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gfx: Implement letter-spacing per CSS 2.1 § 16.4.

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The ligature disabling code has been manually verified, but I was unable
to reftest it. (The only way I could think of would be to create an
Ahem-like font with a ligature table, but that would be an awful lot of
work.)

Near as I can tell, the method used to apply the spacing (manually
inserting extra advance post-shaping) matches Gecko.
This commit is contained in:
Patrick Walton 2014-12-10 14:00:12 -08:00
parent 758d79fff4
commit 07bc97e3e2
11 changed files with 246 additions and 47 deletions
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17
tests/ref/letter_spacing_a.html Normal file
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<html>
<head>
<!-- Tests that `letter-spacing` works. -->
<link rel="stylesheet" type="text/css" href="css/ahem.css">
<style>
* {
letter-spacing: 100px;
color: blue;
}
body {
margin: 0;
}
</style>
<body>XXX</body>
</head>