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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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GPG key ID: 056B727BB9C1027C
11 changed files with 142 additions and 209 deletions
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32
components/style/gecko/conversions.rs
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@ -11,7 +11,7 @@
use app_units::Au;
use gecko::values::GeckoStyleCoordConvertible;
use gecko_bindings::bindings;
use gecko_bindings::structs::{self, nsCSSUnit, nsStyleCoord_CalcValue};
use gecko_bindings::structs::{self, nsStyleCoord_CalcValue};
use gecko_bindings::structs::{nsresult, SheetType, nsStyleImage};
use gecko_bindings::sugar::ns_style_coord::{CoordData, CoordDataMut, CoordDataValue};
use std::f32::consts::PI;
@ -128,35 +128,7 @@ impl From<nsStyleCoord_CalcValue> for NonNegativeLengthOrPercentageOrAuto {
impl From<Angle> for CoordDataValue {
fn from(reference: Angle) -> Self {
match reference {
Angle::Deg(val) => CoordDataValue::Degree(val),
Angle::Grad(val) => CoordDataValue::Grad(val),
Angle::Rad(val) => CoordDataValue::Radian(val),
Angle::Turn(val) => CoordDataValue::Turn(val),
}
}
}
impl Angle {
/// Converts Angle struct into (value, unit) pair.
pub fn to_gecko_values(&self) -> (f32, nsCSSUnit) {
match *self {
Angle::Deg(val) => (val, nsCSSUnit::eCSSUnit_Degree),
Angle::Grad(val) => (val, nsCSSUnit::eCSSUnit_Grad),
Angle::Rad(val) => (val, nsCSSUnit::eCSSUnit_Radian),
Angle::Turn(val) => (val, nsCSSUnit::eCSSUnit_Turn),
}
}
/// Converts gecko (value, unit) pair into Angle struct
pub fn from_gecko_values(value: f32, unit: nsCSSUnit) -> Angle {
match unit {
nsCSSUnit::eCSSUnit_Degree => Angle::Deg(value),
nsCSSUnit::eCSSUnit_Grad => Angle::Grad(value),
nsCSSUnit::eCSSUnit_Radian => Angle::Rad(value),
nsCSSUnit::eCSSUnit_Turn => Angle::Turn(value),
_ => panic!("Unexpected unit for angle"),
}
CoordDataValue::Degree(reference.degrees())
}
}