style: Use Serde for SVGOffsetPath.

Differential Revision: https://phabricator.services.mozilla.com/D60087

components/style/values/generics/motion.rs

@@ -73,13 +73,16 @@ pub struct RayFunction<Angle> {
 /// The offset-path value.
 ///
 /// https://drafts.fxtf.org/motion-1/#offset-path-property
+/// cbindgen:private-default-tagged-enum-constructor=false
 #[derive(
     Animate,
     Clone,
     ComputeSquaredDistance,
     Debug,
+    Deserialize,
     MallocSizeOf,
     PartialEq,
+    Serialize,
     SpecifiedValueInfo,
     ToAnimatedZero,
     ToComputedValue,

components/style/values/specified/svg_path.rs

@@ -21,8 +21,10 @@ use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
 #[derive(
     Clone,
     Debug,
+    Deserialize,
     MallocSizeOf,
     PartialEq,
+    Serialize,
     SpecifiedValueInfo,
     ToAnimatedZero,
     ToComputedValue,
@@ -156,8 +158,10 @@ impl ComputeSquaredDistance for SVGPathData {
     ComputeSquaredDistance,
     Copy,
     Debug,
+    Deserialize,
     MallocSizeOf,
     PartialEq,
+    Serialize,
     SpecifiedValueInfo,
     ToAnimatedZero,
     ToShmem,
@@ -483,8 +487,10 @@ impl ToCss for PathCommand {
     ComputeSquaredDistance,
     Copy,
     Debug,
+    Deserialize,
     MallocSizeOf,
     PartialEq,
+    Serialize,
     SpecifiedValueInfo,
     ToAnimatedZero,
     ToShmem,
@@ -511,8 +517,10 @@ impl IsAbsolute {
     ComputeSquaredDistance,
     Copy,
     Debug,
+    Deserialize,
     MallocSizeOf,
     PartialEq,
+    Serialize,
     SpecifiedValueInfo,
     ToAnimatedZero,
     ToCss,
@@ -530,7 +538,9 @@ impl CoordPair {
 }
 
 /// The EllipticalArc flag type.
-#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToShmem)]
+#[derive(
+    Clone, Copy, Debug, Deserialize, MallocSizeOf, PartialEq, Serialize, SpecifiedValueInfo, ToShmem,
+)]
 #[repr(C)]
 pub struct ArcFlag(bool);
 

components/style_traits/arc_slice.rs

@@ -4,6 +4,8 @@
 
 //! A thin atomically-reference-counted slice.
 
+use serde::de::{Deserialize, Deserializer};
+use serde::ser::{Serialize, Serializer};
 use servo_arc::ThinArc;
 use std::ops::Deref;
 use std::ptr::NonNull;
@@ -60,6 +62,25 @@ impl<T> Default for ArcSlice<T> {
     }
 }
 
+impl<T: Serialize> Serialize for ArcSlice<T> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        self.deref().serialize(serializer)
+    }
+}
+
+impl<'de, T: Deserialize<'de>> Deserialize<'de> for ArcSlice<T> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let r = Vec::deserialize(deserializer)?;
+        Ok(ArcSlice::from_iter(r.into_iter()))
+    }
+}
+
 impl<T> ArcSlice<T> {
     /// Creates an Arc for a slice using the given iterator to generate the
     /// slice.