style: Derive more.

Differential Revision: https://phabricator.services.mozilla.com/D17029

components/style/values/computed/angle.rs

@@ -9,13 +9,12 @@ use crate::values::CSSFloat;
 use num_traits::Zero;
 use std::f64::consts::PI;
 use std::fmt::{self, Write};
-use std::ops::Add;
 use std::{f32, f64};
 use style_traits::{CssWriter, ToCss};
 
 /// A computed angle in degrees.
 #[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
-#[derive(Animate, Clone, Copy, Debug, MallocSizeOf, PartialEq, PartialOrd, ToAnimatedZero)]
+#[derive(Add, Animate, Clone, Copy, Debug, MallocSizeOf, PartialEq, PartialOrd, ToAnimatedZero)]
 pub struct Angle(CSSFloat);
 
 impl ToCss for Angle {
@@ -66,15 +65,6 @@ impl Angle {
     }
 }
 
-impl Add for Angle {
-    type Output = Self;
-
-    #[inline]
-    fn add(self, rhs: Self) -> Self {
-        Angle(self.0 + rhs.0)
-    }
-}
-
 impl Zero for Angle {
     #[inline]
     fn zero() -> Self {

components/style/values/distance.rs

@@ -31,7 +31,7 @@ pub trait ComputeSquaredDistance {
 }
 
 /// A distance between two animatable values.
-#[derive(Clone, Copy, Debug)]
+#[derive(Add, Clone, Copy, Debug, From)]
 pub struct SquaredDistance {
     value: f64,
 }
@@ -114,24 +114,6 @@ impl SquaredDistance {
     }
 }
 
-impl From<SquaredDistance> for f64 {
-    #[inline]
-    fn from(distance: SquaredDistance) -> Self {
-        distance.value
-    }
-}
-
-impl Add for SquaredDistance {
-    type Output = Self;
-
-    #[inline]
-    fn add(self, rhs: Self) -> Self {
-        SquaredDistance {
-            value: self.value + rhs.value,
-        }
-    }
-}
-
 impl Sum for SquaredDistance {
     fn sum<I>(iter: I) -> Self
     where

components/style/values/specified/svg_path.rs

@@ -11,7 +11,6 @@ use crate::values::CSSFloat;
 use cssparser::Parser;
 use std::fmt::{self, Write};
 use std::iter::{Cloned, Peekable};
-use std::ops::AddAssign;
 use std::slice;
 use style_traits::values::SequenceWriter;
 use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
@@ -491,6 +490,7 @@ impl IsAbsolute {
 
 /// The path coord type.
 #[derive(
+    AddAssign,
     Animate,
     Clone,
     ComputeSquaredDistance,
@@ -513,14 +513,6 @@ impl CoordPair {
     }
 }
 
-impl AddAssign for CoordPair {
-    #[inline]
-    fn add_assign(&mut self, other: Self) {
-        self.0 += other.0;
-        self.1 += other.1;
-    }
-}
-
 /// The EllipticalArc flag type.
 #[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo)]
 #[repr(C)]