From 238cb0fbfd6f7143ad718c7aa488c30865f253fd Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 5 Jun 2023 13:27:03 -0600
Subject: [PATCH] [subset/cff1] Speed up for retaingids

---
 src/hb-subset-cff1.cc | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/hb-subset-cff1.cc b/src/hb-subset-cff1.cc
index d9add1b8e..d997c5b66 100644
--- a/src/hb-subset-cff1.cc
+++ b/src/hb-subset-cff1.cc
@@ -584,11 +584,10 @@ struct cff_subset_plan {
 
     /* check whether the subset renumbers any glyph IDs */
     gid_renum = false;
-    for (hb_codepoint_t new_glyph = 0; new_glyph < num_glyphs; new_glyph++)
+    for (const auto &_ : plan->new_to_old_gid_list)
     {
-      if (!plan->old_gid_for_new_gid(new_glyph, &old_glyph))
-	continue;
-      if (new_glyph != old_glyph) {
+      if (_.first != _.second)
+      {
 	gid_renum = true;
 	break;
       }