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gfx: Implement font-stretch per CSS3-FONTS § 3.3 in the Core Text

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font backend.
This commit is contained in:
Patrick Walton 2015-01-01 11:21:27 -05:00
parent aba5c16091
commit abddfa742f
8 changed files with 101 additions and 44 deletions
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17
components/gfx/platform/macos/font.rs
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@ -15,7 +15,7 @@ use servo_util::geometry::{Au, px_to_pt};
use servo_util::geometry;
use platform::macos::font_context::FontContextHandle;
use text::glyph::GlyphId;
use style::computed_values::font_weight;
use style::computed_values::{font_stretch, font_weight};
use platform::font_template::FontTemplateData;
use core_foundation::base::CFIndex;
@ -111,6 +111,21 @@ impl FontHandleMethods for FontHandle {
return font_weight::T::Weight900;
}
fn stretchiness(&self) -> font_stretch::T {
let normalized = self.ctfont.all_traits().normalized_width(); // [-1.0, 1.0]
match (normalized + 1.0) / 2.0 * 9.0 { // [0.0, 9.0]
v if v < 1.0 => font_stretch::T::ultra_condensed,
v if v < 2.0 => font_stretch::T::extra_condensed,
v if v < 3.0 => font_stretch::T::condensed,
v if v < 4.0 => font_stretch::T::semi_condensed,
v if v < 5.0 => font_stretch::T::normal,
v if v < 6.0 => font_stretch::T::semi_expanded,
v if v < 7.0 => font_stretch::T::expanded,
v if v < 8.0 => font_stretch::T::extra_expanded,
_ => font_stretch::T::ultra_expanded,
}
}
fn glyph_index(&self, codepoint: char) -> Option<GlyphId> {
let characters: [UniChar; 1] = [codepoint as UniChar];
let mut glyphs: [CGGlyph; 1] = [0 as CGGlyph];