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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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26
tests/ref/letter_spacing_ref.html Normal file
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<html>
<head>
<!-- Tests that `letter-spacing` works. -->
<style>
section, nav, main {
background-color: blue;
width: 100px;
height: 100px;
position: absolute;
top: 0;
}
section {
left: 0;
}
nav {
left: 200px;
}
main {
left: 400px;
}
</style>
<body><section></section><nav></nav><main></main></body>
</head>