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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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12
components/style/gecko_bindings/sugar/ns_css_value.rs
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@ -198,19 +198,19 @@ impl nsCSSValue {
/// Returns an `Angle` value from this `nsCSSValue`.
///
/// Panics if the unit is not `eCSSUnit_Degree` `eCSSUnit_Grad`, `eCSSUnit_Turn`
/// or `eCSSUnit_Radian`.
/// Panics if the unit is not `eCSSUnit_Degree`.
#[inline]
pub fn get_angle(&self) -> Angle {
Angle::from_gecko_values(self.float_unchecked(), self.mUnit)
debug_assert_eq!(self.mUnit, nsCSSUnit::eCSSUnit_Degree);
Angle::from_degrees(self.float_unchecked())
}
/// Sets Angle value to this nsCSSValue.
pub fn set_angle(&mut self, angle: Angle) {
debug_assert_eq!(self.mUnit, nsCSSUnit::eCSSUnit_Null);
let (value, unit) = angle.to_gecko_values();
self.mUnit = unit;
self.mUnit = nsCSSUnit::eCSSUnit_Degree;
unsafe {
*self.mValue.mFloat.as_mut() = value;
*self.mValue.mFloat.as_mut() = angle.degrees();
}
}