From b6fa8451461b51cc793a4cd0ab17350e3e6ae9fe Mon Sep 17 00:00:00 2001
From: Werner Lemberg <wl@gnu.org>
Date: Sun, 21 Dec 2008 09:46:31 +0000
Subject: [PATCH] * src/autofit/aflatin.c (af_latin_hint_edges),
 src/autofit/aflatin2.c (af_latin2_hint_edges), src/autofit/afcjk.c
 (af_cjk_hint_edges): Protect against division by zero.

---
 ChangeLog              |  6 ++++++
 src/autofit/afcjk.c    | 13 +++++++++----
 src/autofit/aflatin.c  |  5 ++++-
 src/autofit/aflatin2.c |  5 ++++-
 4 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b6515b2aa..233623223 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-12-21  Hongbo Ni  <hongbo@njstar.com>
+
+	* src/autofit/aflatin.c (af_latin_hint_edges),
+	src/autofit/aflatin2.c (af_latin2_hint_edges), src/autofit/afcjk.c
+	(af_cjk_hint_edges): Protect against division by zero.
+
 2008-12-18  Werner Lemberg  <wl@gnu.org>
 
 	* docs/CHANGES: Updated.
diff --git a/src/autofit/afcjk.c b/src/autofit/afcjk.c
index 7f77f7b17..de3ce11d5 100644
--- a/src/autofit/afcjk.c
+++ b/src/autofit/afcjk.c
@@ -1253,10 +1253,15 @@
         else if ( after >= edge_limit )
           af_cjk_align_serif_edge( hints, before, edge );
         else
-          edge->pos = before->pos +
-            FT_MulDiv( edge->fpos - before->fpos,
-                       after->pos - before->pos,
-                       after->fpos - before->fpos );
+        {
+          if ( after->fpos == before->fpos )
+            edge->pos = before->pos;
+          else
+            edge->pos = before->pos +
+                        FT_MulDiv( edge->fpos - before->fpos,
+                                   after->pos - before->pos,
+                                   after->fpos - before->fpos );
+        }
       }
     }
   }
diff --git a/src/autofit/aflatin.c b/src/autofit/aflatin.c
index 09f9a98fa..ba59e5b38 100644
--- a/src/autofit/aflatin.c
+++ b/src/autofit/aflatin.c
@@ -2008,7 +2008,10 @@
           if ( before >= edges && before < edge   &&
                after < edge_limit && after > edge )
           {
-            edge->pos = before->pos +
+            if ( after->opos == before->opos )
+              edge->pos = before->pos;
+            else
+              edge->pos = before->pos +
                           FT_MulDiv( edge->opos - before->opos,
                                      after->pos - before->pos,
                                      after->opos - before->opos );
diff --git a/src/autofit/aflatin2.c b/src/autofit/aflatin2.c
index 784ccb018..14327b172 100644
--- a/src/autofit/aflatin2.c
+++ b/src/autofit/aflatin2.c
@@ -2153,7 +2153,10 @@
           if ( before >= edges && before < edge   &&
                after < edge_limit && after > edge )
           {
-            edge->pos = before->pos +
+            if ( after->opos == before->opos )
+              edge->pos = before->pos;
+            else
+              edge->pos = before->pos +
                           FT_MulDiv( edge->opos - before->opos,
                                      after->pos - before->pos,
                                      after->opos - before->opos );