commit 72c0a1878313e7232d554bc226f4c6dc01418a95
author Behdad Esfahbod <behdad@behdad.org> Fri Jun 08 20:30:03 2012 -0400
committer Behdad Esfahbod <behdad@behdad.org> Fri Jun 08 20:30:03 2012 -0400
tree 7de66c2347a344e44151f33bffbc32f138949f2e
parent cd5891493df06fdb92e1ae526d29dee8df250235

Extend clusters backward in out-buffer

src/hb-buffer.cc

diff --git a/src/hb-buffer.cc b/src/hb-buffer.cc
index c3cf561..38eb95f 100644
--- a/src/hb-buffer.cc
+++ b/src/hb-buffer.cc
@@ -452,10 +452,18 @@
 hb_buffer_t::merge_out_clusters (unsigned int start,
 				 unsigned int end)
 {
+  if (unlikely (start >= end))
+    return;
+
   unsigned int cluster = out_info[start].cluster;
 
   for (unsigned int i = start + 1; i < end; i++)
     cluster = MIN (cluster, out_info[i].cluster);
+
+  /* Extend start */
+  while (start && out_info[start - 1].cluster == out_info[start].cluster)
+    start--;
+
   for (unsigned int i = start; i < end; i++)
     out_info[i].cluster = cluster;
 }