Update freetype to 2.5.4.

third_party/freetype/include/ftttdrv.h

 /***************************************************************************/
 /*                                                                         */
 /*  ftttdrv.h                                                              */
 /*                                                                         */
 /*    FreeType API for controlling the TrueType driver                     */
 /*    (specification only).                                                */
 /*                                                                         */
 /*  Copyright 2013 by                                                      */
 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
 /*                                                                         */
 /*  This file is part of the FreeType project, and may only be used,       */
 /*  modified, and distributed under the terms of the FreeType project      */
 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
 /*  this file you indicate that you have read the license and              */
 /*  understand and accept it fully.                                        */
 /*                                                                         */
 /***************************************************************************/
 
 
 #ifndef __FTTTDRV_H__
 #define __FTTTDRV_H__
 
-#include "../ft2build.h"
-#include "freetype.h"
+#include <ft2build.h>
+#include FT_FREETYPE_H
 
 #ifdef FREETYPE_H
 #error "freetype.h of FreeType 1 has been loaded!"
 #error "Please fix the directory search order for header files"
 #error "so that freetype.h of FreeType 2 is found first."
 #endif
 
 
 FT_BEGIN_HEADER
 
@@ skipping 19 matching lines @@
    *
    */
 
 
   /**************************************************************************
    *
    * @property:
    *   interpreter-version
    *
    * @description:
-   *   Currently, two versions are available which represent the bytecode
+   *   Currently, two versions are available, representing the bytecode
    *   interpreter with and without subpixel hinting support,
    *   respectively.  The default is subpixel support if
    *   TT_CONFIG_OPTION_SUBPIXEL_HINTING is defined, and no subpixel
    *   support otherwise (since it isn't available then).
    *
    *   If subpixel hinting is on, many TrueType bytecode instructions
    *   behave differently compared to B/W or grayscale rendering.  The
    *   main idea is to render at a much increased horizontal resolution,
    *   then sampling down the created output to subpixel precision.
    *   However, many older fonts are not suited to this and must be
@@ skipping 52 matching lines @@
    * @note:
    *   This property controls the behaviour of the bytecode interpreter
    *   and thus how outlines get hinted.  It does *not* control how glyph
    *   get rasterized!  In particular, it does not control subpixel color
    *   filtering.
    *
    *   If FreeType has not been compiled with configuration option
    *   FT_CONFIG_OPTION_SUBPIXEL_HINTING, selecting version~38 causes an
    *   `FT_Err_Unimplemented_Feature' error.
    *
+   *   Depending on the graphics framework, Microsoft uses different
+   *   bytecode engines.  As a consequence, the version numbers returned by
+   *   a call to the `GETINFO[1]' bytecode instruction are more convoluted
+   *   than desired.
+   *
+   *   {
+   *      framework   Windows version   result of GETINFO[1]
+   *     ----------------------------------------------------
+   *       GDI         before XP         35
+   *       GDI         XP and later      37
+   *       GDI+ old    before Vista      37
+   *       GDI+ old    Vista, 7          38
+   *       GDI+        after 7           40
+   *       DWrite      before 8          39
+   *       DWrite      8 and later       40
+   *   }
+   *
+   *   Since FreeType doesn't provide all capabilities of DWrite ClearType,
+   *   using version~38 seems justified.
+   *
    */
 #define TT_INTERPRETER_VERSION_35  35
 #define TT_INTERPRETER_VERSION_38  38
 
+ /* */
 
- /* */
 
 FT_END_HEADER
 
 
 #endif /* __FTTTDRV_H__ */
 
 
 /* END */