[pango] Bug 720379 - SIGFPE in pango_layout_iter_get_char_extents()

[Behdad Esfahbod <behdad src gnome org>]

commit a6c318ee505aeabe6f84e1543d68834b9e0e7acf
Author: Behdad Esfahbod <behdad behdad org>
Date:   Sun Dec 15 18:42:17 2013 -0500

    Bug 720379 - SIGFPE in pango_layout_iter_get_char_extents()
    
    Untested.

 pango/pango-layout.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/pango/pango-layout.c b/pango/pango-layout.c
index a024d11..607a5f0 100644
--- a/pango/pango-layout.c
+++ b/pango/pango-layout.c
@@ -6178,8 +6178,15 @@ pango_layout_iter_get_char_extents (PangoLayoutIter *iter,
       return;
     }
 
-  x0 = (iter->character_position * cluster_rect.width) / iter->cluster_num_chars;
-  x1 = ((iter->character_position + 1) * cluster_rect.width) / iter->cluster_num_chars;
+  if (iter->cluster_num_chars)
+  {
+    x0 = (iter->character_position * cluster_rect.width) / iter->cluster_num_chars;
+    x1 = ((iter->character_position + 1) * cluster_rect.width) / iter->cluster_num_chars;
+  }
+  else
+  {
+    x0 = x1 = 0;
+  }
 
   logical_rect->width = x1 - x0;
   logical_rect->height = cluster_rect.height;