1 files changed, 37 insertions, 0 deletions
diff --git a/servo/components/style/values/animated/font.rs b/servo/components/style/values/animated/font.rs
new file mode 100644
index 0000000000..63d4a14b2f
--- /dev/null
+++ b/servo/components/style/values/animated/font.rs
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Animation implementation for various font-related types.
+
+use super::{Animate, Procedure, ToAnimatedZero};
+use crate::values::computed::font::FontVariationSettings;
+use crate::values::distance::{ComputeSquaredDistance, SquaredDistance};
+
+/// <https://drafts.csswg.org/css-fonts-4/#font-variation-settings-def>
+///
+/// Note that the ComputedValue implementation will already have sorted and de-dup'd
+/// the lists of settings, so we can just iterate over the two lists together and
+/// animate their individual values.
+impl Animate for FontVariationSettings {
+    #[inline]
+    fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
+        let result: Vec<_> =
+            super::lists::by_computed_value::animate(&self.0, &other.0, procedure)?;
+        Ok(Self(result.into_boxed_slice()))
+    }
+}
+
+impl ComputeSquaredDistance for FontVariationSettings {
+    #[inline]
+    fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> {
+        super::lists::by_computed_value::squared_distance(&self.0, &other.0)
+    }
+}
+
+impl ToAnimatedZero for FontVariationSettings {
+    #[inline]
+    fn to_animated_zero(&self) -> Result<Self, ()> {
+        Err(())
+    }
+}