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gfx: Use subpixel positioning for glyphs.

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Improves text rendering significantly.
This commit is contained in:
Patrick Walton 2014-10-02 08:04:24 -07:00
parent c7915028b4
commit dbdfce0695
2 changed files with 8 additions and 2 deletions
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4
components/gfx/display_list/mod.rs
View file

@ -110,8 +110,8 @@ impl ScaledFontExtensionMethods for ScaledFont {
let azglyph = struct__AzGlyph { let azglyph = struct__AzGlyph {
mIndex: glyph.id() as uint32_t, mIndex: glyph.id() as uint32_t,
mPosition: struct__AzPoint { mPosition: struct__AzPoint {
x: (origin.x + glyph_offset.x).to_nearest_px() as AzFloat, x: (origin.x + glyph_offset.x).to_subpx() as AzFloat,
y: (origin.y + glyph_offset.y).to_nearest_px() as AzFloat y: (origin.y + glyph_offset.y).to_subpx() as AzFloat
} }
}; };
origin = Point2D(origin.x + glyph_advance, origin.y); origin = Point2D(origin.x + glyph_advance, origin.y);

6
components/util/geometry.rs
View file

@ -200,6 +200,12 @@ impl Au {
((s as f64) / 60f64).round() as int ((s as f64) / 60f64).round() as int
} }
#[inline]
pub fn to_subpx(&self) -> f64 {
let Au(s) = *self;
(s as f64) / 60f64
}
#[inline] #[inline]
pub fn to_snapped(&self) -> Au { pub fn to_snapped(&self) -> Au {
let Au(s) = *self; let Au(s) = *self;