From cf5001fac7770286082ced9d3c5c5fefa3b19d79 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 18 May 2022 13:38:29 -0600
Subject: [PATCH] [subset] Optimize
 CoverageFormat2::intersected_coverage_glyphs

---
 src/hb-ot-layout-common.hh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/hb-ot-layout-common.hh b/src/hb-ot-layout-common.hh
index a736dff28..454383a04 100644
--- a/src/hb-ot-layout-common.hh
+++ b/src/hb-ot-layout-common.hh
@@ -1574,8 +1574,10 @@ struct CoverageFormat2
     for (const auto& range : rangeRecord.as_array ())
     {
       if (!range.intersects (glyphs)) continue;
-      for (hb_codepoint_t g = range.first; g <= range.last; g++)
-        if (glyphs->has (g)) intersect_glyphs->add (g);
+      unsigned last = range.last;
+      for (hb_codepoint_t g = range.first - 1;
+	   glyphs->next (&g) && g <= last;)
+        intersect_glyphs->add (g);
     }
   }