From e565e455e2a72b1b1fae4afe1c176a6ff0b4bdf1 Mon Sep 17 00:00:00 2001
From: Calixte Denizet <calixte.denizet@gmail.com>
Date: Sat, 7 Jan 2023 13:45:01 +0100
Subject: [PATCH] Set ExpansionFactor to 0.06 when it's equals to 0 in the
 private dict of CFF fonts

---
 src/core/cff_parser.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/core/cff_parser.js b/src/core/cff_parser.js
index 44e0b481e..d61a7f514 100644
--- a/src/core/cff_parser.js
+++ b/src/core/cff_parser.js
@@ -792,6 +792,12 @@ class CFFParser {
     );
     parentDict.privateDict = privateDict;
 
+    if (privateDict.getByName("ExpansionFactor") === 0) {
+      // Firefox doesn't render correctly such a font on Windows (see issue
+      // 15289), hence we just reset it to its default value.
+      privateDict.setByName("ExpansionFactor", 0.06);
+    }
+
     // Parse the Subrs index also since it's relative to the private dict.
     if (!privateDict.getByName("Subrs")) {
       return;