From 273ed6127bd9471fd11b3c1c7f232638f1ff1dba Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 2 May 2019 14:04:51 -0700
Subject: [PATCH] [serializer] Add serialize_copy()

---
 src/hb-open-type.hh | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/hb-open-type.hh b/src/hb-open-type.hh
index bde059602..17e8d2a97 100644
--- a/src/hb-open-type.hh
+++ b/src/hb-open-type.hh
@@ -305,6 +305,20 @@ struct OffsetTo : Offset<OffsetType, has_null>
     return ret;
   }
 
+  template <typename T>
+  bool serialize_copy (hb_serialize_context_t *c, const T &src, const void *base)
+  {
+    *this = 0;
+    if (has_null && &src == &Null (T))
+      return false;
+
+    c->push ();
+
+    c->copy (src);
+
+    c->add_link (*this, c->pop_pack (), base);
+  }
+
   bool sanitize_shallow (hb_sanitize_context_t *c, const void *base) const
   {
     TRACE_SANITIZE (this);