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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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2
components/util/geometry.rs
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@ -64,7 +64,7 @@ pub enum PagePx {}
// See https://bugzilla.mozilla.org/show_bug.cgi?id=177805 for more info.
//
// FIXME: Implement Au using Length and ScaleFactor instead of a custom type.
#[deriving(Clone, PartialEq, PartialOrd, Eq, Ord, Zero)]
#[deriving(Clone, Hash, PartialEq, PartialOrd, Eq, Ord, Zero)]
pub struct Au(pub i32);
impl Default for Au {