Parse math fonts only once

1 files changed, 5 insertions, 5 deletions

diff --git a/src/library/math/rex.rs b/src/library/math/rex.rs
index addf56b6..0268fb9c 100644
--- a/src/library/math/rex.rs
+++ b/src/library/math/rex.rs
@@ -35,13 +35,13 @@ impl Layout for RexNode {
             .at(span)?;
 
         // Prepare the font.
-        let data = ctx.fonts.get(face_id).buffer();
-        let font = MathFont::parse(data)
-            .map_err(|_| "failed to parse math font")
+        let face = ctx.fonts.get(face_id);
+        let ctx = face
+            .math()
+            .and_then(FontContext::new)
+            .ok_or("font is not suitable for math")
             .at(span)?;
 
-        let ctx = FontContext::new(&font).ok_or("failed to parse math font").at(span)?;
-
         // Layout the formula.
         let em = styles.get(TextNode::SIZE);
         let style = if self.display { Style::Display } else { Style::Text };