Knuth-Plass and MicroType

2 files changed, 11 insertions, 0 deletions

diff --git a/src/geom/em.rs b/src/geom/em.rs
index b9f1d897..d1cf3288 100644
--- a/src/geom/em.rs
+++ b/src/geom/em.rs
@@ -108,3 +108,9 @@ assign_impl!(Em += Em);
 assign_impl!(Em -= Em);
 assign_impl!(Em *= f64);
 assign_impl!(Em /= f64);
+
+impl Sum for Em {
+    fn sum<I: Iterator<Item = Self>>(iter: I) -> Self {
+        Self(iter.map(|s| s.0).sum())
+    }
+}
diff --git a/src/geom/relative.rs b/src/geom/relative.rs
index 4b638805..885de34a 100644
--- a/src/geom/relative.rs
+++ b/src/geom/relative.rs
@@ -43,6 +43,11 @@ impl Relative {
         self.0 == 0.0
     }
 
+    /// Whether the ratio is one.
+    pub fn is_one(self) -> bool {
+        self.0 == 1.0
+    }
+
     /// The absolute value of the this relative.
     pub fn abs(self) -> Self {
         Self::new(self.get().abs())