From 570fb4df58fcaa58c82b363f4edb5d61f1d948fb Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 26 Jun 2023 16:26:12 -0600
Subject: [PATCH] [subset/cff] Add a vector pre-alloc

---
 src/hb-ot-cff-common.hh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/hb-ot-cff-common.hh b/src/hb-ot-cff-common.hh
index 43910a5f7..f285dad67 100644
--- a/src/hb-ot-cff-common.hh
+++ b/src/hb-ot-cff-common.hh
@@ -360,6 +360,9 @@ struct FDArray : CFFIndex<COUNT>
 
     /* serialize INDEX data */
     hb_vector_t<unsigned> sizes;
+    if (it.is_random_access_iterator)
+      sizes.alloc (hb_len (it));
+
     c->push ();
     + it
     | hb_map ([&] (const hb_pair_t<const DICTVAL&, const INFO&> &_)