From 02c6c8cd6e8c93b63c75b25de6bf76bb45755bb4 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Fri, 15 Nov 2013 13:05:38 -0500
Subject: [PATCH] Set buffer content type to INVALID in hb_buffer_set_length(0)

Previously we were only setting this in hb_buffer_clear_contents(),
but set_length(0) is a valid way to reinitialize buffer to use with
new text.
---
 src/hb-buffer-private.hh | 2 +-
 src/hb-buffer.cc         | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index d3ed4491..49773f1c 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -181,7 +181,7 @@ struct hb_buffer_t {
   HB_INTERNAL bool enlarge (unsigned int size);
 
   inline bool ensure (unsigned int size)
-  { return likely (size < allocated) ? true : enlarge (size); }
+  { return likely (!size || size < allocated) ? true : enlarge (size); }
 
   HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
   HB_INTERNAL bool shift_forward (unsigned int count);
diff --git a/src/hb-buffer.cc b/src/hb-buffer.cc
index bbf8ea0f..d6c6fcb8 100644
--- a/src/hb-buffer.cc
+++ b/src/hb-buffer.cc
@@ -1150,7 +1150,10 @@ hb_buffer_set_length (hb_buffer_t  *buffer,
   buffer->len = length;
 
   if (!length)
+  {
+    buffer->content_type = HB_BUFFER_CONTENT_TYPE_INVALID;
     buffer->clear_context (0);
+  }
   buffer->clear_context (1);
 
   return true;
-- 
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