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Support addition of font-stretch

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Although there are no specific tests for this yet if any code does try
to perform addition or accumulation with a font-stretch value it will
likely fail the bounds check in the Into trait. To avoid that this
patch provides an basic implementation of add_weighted for font-stretch
that should work correctly with portions whose sum is outside the [0.0,
1.0] range.
This commit is contained in:
Brian Birtles 2017-05-23 15:14:18 +09:00
parent d45ee9d662
commit 4d187524c6
1 changed files with 11 additions and 6 deletions
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17
components/style/properties/helpers/animated_properties.mako.rs
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@ -1373,11 +1373,16 @@ impl Animatable for FontWeight {
/// https://drafts.csswg.org/css-fonts/#font-stretch-prop
impl Animatable for FontStretch {
#[inline]
fn add_weighted(&self, other: &Self, self_portion: f64, other_portion: f64) -> Result<Self, ()> {
fn add_weighted(&self, other: &Self, self_portion: f64, other_portion: f64)
-> Result<Self, ()>
{
let from = f64::from(*self);
let to = f64::from(*other);
let interpolated_mapped_index = ((from * self_portion + to * other_portion) + 0.5).floor();
Ok(interpolated_mapped_index.into())
let to = f64::from(*other);
// FIXME: When `const fn` is available in release rust, make |normal|, below, const.
let normal = f64::from(FontStretch::normal);
let result = (from - normal) * self_portion + (to - normal) * other_portion + normal;
Ok(result.into())
}
#[inline]
@ -1410,11 +1415,11 @@ impl From<FontStretch> for f64 {
impl Into<FontStretch> for f64 {
fn into(self) -> FontStretch {
use properties::longhands::font_stretch::computed_value::T::*;
debug_assert!(self >= 1.0 && self <= 9.0);
let index = (self + 0.5).floor().min(9.0).max(1.0);
static FONT_STRETCH_ENUM_MAP: [FontStretch; 9] =
[ ultra_condensed, extra_condensed, condensed, semi_condensed, normal,
semi_expanded, expanded, extra_expanded, ultra_expanded ];
FONT_STRETCH_ENUM_MAP[(self - 1.0) as usize]
FONT_STRETCH_ENUM_MAP[(index - 1.0) as usize]
}
}