taken from upstream

http://savannah.nongnu.org/bugs/?func=detailitem&item_id=46118

From 30fe5e762e062612fdf4b56b50d813525a5aa311 Mon Sep 17 00:00:00 2001
From: Werner Lemberg <wl@gnu.org>
Date: Sun, 4 Oct 2015 13:08:08 +0200
Subject: [PATCH] [base] Replace left shifts with multiplication (#46118).

* src/base/ftglyph.c (ft_bitmap_glyph_bbox, FT_Get_Glyph): Do it.
---
 ChangeLog          |  6 ++++++
 src/base/ftglyph.c | 14 +++++++-------
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/src/base/ftglyph.c b/src/base/ftglyph.c
index cb7fc37..2778743 100644
--- a/src/base/ftglyph.c
+++ b/src/base/ftglyph.c
@@ -125,10 +125,10 @@
     FT_BitmapGlyph  glyph = (FT_BitmapGlyph)bitmap_glyph;
 
 
-    cbox->xMin = glyph->left << 6;
-    cbox->xMax = cbox->xMin + (FT_Pos)( glyph->bitmap.width << 6 );
-    cbox->yMax = glyph->top << 6;
-    cbox->yMin = cbox->yMax - (FT_Pos)( glyph->bitmap.rows << 6 );
+    cbox->xMin = glyph->left * 64;
+    cbox->xMax = cbox->xMin + (FT_Pos)( glyph->bitmap.width * 64 );
+    cbox->yMax = glyph->top * 64;
+    cbox->yMin = cbox->yMax - (FT_Pos)( glyph->bitmap.rows * 64 );
   }
 
 
@@ -403,9 +403,9 @@
     if ( error )
       goto Exit;
 
-    /* copy advance while converting it to 16.16 format */
-    glyph->advance.x = slot->advance.x << 10;
-    glyph->advance.y = slot->advance.y << 10;
+    /* copy advance while converting 26.6 to 16.16 format */
+    glyph->advance.x = slot->advance.x * 1024;
+    glyph->advance.y = slot->advance.y * 1024;
 
     /* now import the image from the glyph slot */
     error = clazz->glyph_init( glyph, slot );
-- 
2.5.2