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style: Always compute angle values to degrees.

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This matches the spec, https://drafts.csswg.org/css-values/#angles, which says:

> All <angle> units are compatible, and deg is their canonical unit.

And https://drafts.csswg.org/css-values/#compat, which says:

>When serializing computed values [...], compatible units [...] are converted into a single canonical unit.

And also other implementations (Blink always serializes angles as degrees in
computed style for example).

Also allows us to get rid of quite a bit of code, and makes computed angle value
representation just a number, which is nice.

Differential Revision: https://phabricator.services.mozilla.com/D8619
This commit is contained in:
Emilio Cobos Álvarez 2018-10-13 00:41:03 +00:00
parent 11fedf18d9
commit 42def5a011
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11 changed files with 142 additions and 209 deletions
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3
components/style/values/specified/image.rs
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@ -15,7 +15,6 @@ use selectors::parser::SelectorParseErrorKind;
#[cfg(feature = "servo")]
use servo_url::ServoUrl;
use std::cmp::Ordering;
use std::f32::consts::PI;
use std::fmt::{self, Write};
use style_traits::{CssType, CssWriter, KeywordsCollectFn, ParseError};
use style_traits::{StyleParseErrorKind, SpecifiedValueInfo, ToCss};
@ -679,7 +678,7 @@ impl GradientKind {
impl generic::LineDirection for LineDirection {
fn points_downwards(&self, compat_mode: CompatMode) -> bool {
match *self {
LineDirection::Angle(ref angle) => angle.radians() == PI,
LineDirection::Angle(ref angle) => angle.degrees() == 180.0,
LineDirection::Vertical(Y::Bottom) if compat_mode == CompatMode::Modern => true,
LineDirection::Vertical(Y::Top) if compat_mode != CompatMode::Modern => true,
#[cfg(feature = "gecko")]