From 4e9ff1dd6ee3ea63fd91a76a91d9725a10a294a0 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 15 Aug 2011 16:21:22 +0200
Subject: [PATCH] Pre-allocate buffers when adding string

We do a conservative estimate of the number of characters, but still,
this limits the number of buffer reallocs to a small constant.
---
 src/hb-buffer.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/hb-buffer.cc b/src/hb-buffer.cc
index 3be3f4438..3f46d686e 100644
--- a/src/hb-buffer.cc
+++ b/src/hb-buffer.cc
@@ -723,6 +723,7 @@ hb_buffer_guess_properties (hb_buffer_t *buffer)
 	  } \
 	  if (item_length == -1) \
 	    item_length = text_length - item_offset; \
+	  buffer->ensure (buffer->len + item_length * sizeof (T) / 4); \
 	  const T *next = (const T *) text + item_offset; \
 	  const T *end = next + item_length; \
 	  while (next < end) { \