Work around a behaviour change in freetype > 2.8

Freetype will throw an error when we try to retrieve the glyph if the x/y
advance values are too big to fit in a 16.16 fixed point value.

Since we have no need of those values, set them to zero, and avoid the error.

Bring freetype up to 2.9.1

Plus the gs makefile changes to support the new version.

Reapply "Work around a change in the zlib API for 1.2.11"

for Freetype
commit: 08482c582115a1396d0fd9186011008f889a61c5

1 files changed, 54 insertions, 60 deletions

diff --git a/freetype/devel/ftoption.h b/freetype/devel/ftoption.h
index b742ed88f..1b4619eb0 100644
--- a/freetype/devel/ftoption.h
+++ b/freetype/devel/ftoption.h
@@ -4,7 +4,7 @@
 /*                                                                         */
 /*    User-selectable configuration macros (specification only).           */
 /*                                                                         */
-/*  Copyright 1996-2016 by                                                 */
+/*  Copyright 1996-2018 by                                                 */
 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
 /*                                                                         */
 /*  This file is part of the FreeType project, and may only be used,       */
@@ -82,8 +82,8 @@ FT_BEGIN_HEADER
   /* to control the various font drivers and modules.  The controllable    */
   /* properties are listed in the section `Controlling FreeType Modules'   */
   /* in the reference's table of contents; currently there are properties  */
-  /* for the auto-hinter (file `ftautoh.h'), CFF (file `ftcffdrv.h'), and  */
-  /* TrueType (file `ftttdrv.h').                                          */
+  /* for the auto-hinter (file `ftautoh.h'), CFF (file `ftcffdrv.h'),      */
+  /* TrueType (file `ftttdrv.h'), and PCF (file `ftpcfdrv.h').             */
   /*                                                                       */
   /* `FREETYPE_PROPERTIES' has the following syntax form (broken here into */
   /* multiple lines for better readability).                               */
@@ -107,22 +107,19 @@ FT_BEGIN_HEADER
 
   /*************************************************************************/
   /*                                                                       */
-  /* Uncomment the line below if you want to activate sub-pixel rendering  */
-  /* (a.k.a. LCD rendering, or ClearType) in this build of the library.    */
+  /* Uncomment the line below if you want to activate LCD rendering        */
+  /* technology similar to ClearType in this build of the library.  This   */
+  /* technology triples the resolution in the direction color subpixels.   */
+  /* To mitigate color fringes inherent to this technology, you also need  */
+  /* to explicitly set up LCD filtering.                                   */
   /*                                                                       */
   /* Note that this feature is covered by several Microsoft patents        */
   /* and should not be activated in any default build of the library.      */
+  /* When this macro is not defined, FreeType offers alternative LCD       */
+  /* rendering technology that produces excellent output without LCD       */
+  /* filtering.                                                            */
   /*                                                                       */
-  /* This macro has no impact on the FreeType API, only on its             */
-  /* _implementation_.  For example, using FT_RENDER_MODE_LCD when calling */
-  /* FT_Render_Glyph still generates a bitmap that is 3 times wider than   */
-  /* the original size in case this macro isn't defined; however, each     */
-  /* triplet of subpixels has R=G=B.                                       */
-  /*                                                                       */
-  /* This is done to allow FreeType clients to run unmodified, forcing     */
-  /* them to display normal gray-level anti-aliased glyphs.                */
-  /*                                                                       */
-#define FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+/* #define FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
 
 
   /*************************************************************************/
@@ -273,48 +270,6 @@ FT_BEGIN_HEADER
 
   /*************************************************************************/
   /*                                                                       */
-  /* DLL export compilation                                                */
-  /*                                                                       */
-  /*   When compiling FreeType as a DLL, some systems/compilers need a     */
-  /*   special keyword in front OR after the return type of function       */
-  /*   declarations.                                                       */
-  /*                                                                       */
-  /*   Two macros are used within the FreeType source code to define       */
-  /*   exported library functions: FT_EXPORT and FT_EXPORT_DEF.            */
-  /*                                                                       */
-  /*     FT_EXPORT( return_type )                                          */
-  /*                                                                       */
-  /*       is used in a function declaration, as in                        */
-  /*                                                                       */
-  /*         FT_EXPORT( FT_Error )                                         */
-  /*         FT_Init_FreeType( FT_Library*  alibrary );                    */
-  /*                                                                       */
-  /*                                                                       */
-  /*     FT_EXPORT_DEF( return_type )                                      */
-  /*                                                                       */
-  /*       is used in a function definition, as in                         */
-  /*                                                                       */
-  /*         FT_EXPORT_DEF( FT_Error )                                     */
-  /*         FT_Init_FreeType( FT_Library*  alibrary )                     */
-  /*         {                                                             */
-  /*           ... some code ...                                           */
-  /*           return FT_Err_Ok;                                           */
-  /*         }                                                             */
-  /*                                                                       */
-  /*   You can provide your own implementation of FT_EXPORT and            */
-  /*   FT_EXPORT_DEF here if you want.  If you leave them undefined, they  */
-  /*   will be later automatically defined as `extern return_type' to      */
-  /*   allow normal compilation.                                           */
-  /*                                                                       */
-  /*   Do not #undef these macros here since the build system might define */
-  /*   them for certain configurations only.                               */
-  /*                                                                       */
-/* #define FT_EXPORT(x)      extern x */
-/* #define FT_EXPORT_DEF(x)  x */
-
-
-  /*************************************************************************/
-  /*                                                                       */
   /* Glyph Postscript Names handling                                       */
   /*                                                                       */
   /*   By default, FreeType 2 is compiled with the `psnames' module.  This */
@@ -327,7 +282,7 @@ FT_BEGIN_HEADER
   /*                                                                       */
   /*   - The TrueType driver will provide its own set of glyph names,      */
   /*     if you build it to support postscript names in the TrueType       */
-  /*     `post' table.                                                     */
+  /*     `post' table, but will not synthesize a missing Unicode charmap.  */
   /*                                                                       */
   /*   - The Type 1 driver will not be able to synthesize a Unicode        */
   /*     charmap out of the glyphs found in the fonts.                     */
@@ -672,7 +627,7 @@ FT_BEGIN_HEADER
   /* This option requires TT_CONFIG_OPTION_BYTECODE_INTERPRETER to be      */
   /* defined.                                                              */
   /*                                                                       */
-  /* [1] http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx */
+  /* [1] https://www.microsoft.com/typography/cleartype/truetypecleartype.aspx */
   /*                                                                       */
 /* #define TT_CONFIG_OPTION_SUBPIXEL_HINTING  1     */
 /* #define TT_CONFIG_OPTION_SUBPIXEL_HINTING  2     */
@@ -692,7 +647,7 @@ FT_BEGIN_HEADER
   /* composite flags array which can be used to disambiguate, but old      */
   /* fonts will not have them.                                             */
   /*                                                                       */
-  /*   http://www.microsoft.com/typography/otspec/glyf.htm                 */
+  /*   https://www.microsoft.com/typography/otspec/glyf.htm                */
   /*   https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6glyf.html */
   /*                                                                       */
 #undef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
@@ -790,6 +745,16 @@ FT_BEGIN_HEADER
 
 
   /*************************************************************************/
+  /*                                                                       */
+  /* T1_CONFIG_OPTION_OLD_ENGINE controls whether the pre-Adobe Type 1     */
+  /* engine gets compiled into FreeType.  If defined, it is possible to    */
+  /* switch between the two engines using the `hinting-engine' property of */
+  /* the type1 driver module.                                              */
+  /*                                                                       */
+#define T1_CONFIG_OPTION_OLD_ENGINE
+
+
+  /*************************************************************************/
   /*************************************************************************/
   /****                                                                 ****/
   /****         C F F   D R I V E R    C O N F I G U R A T I O N        ****/
@@ -835,6 +800,33 @@ FT_BEGIN_HEADER
   /*************************************************************************/
   /*************************************************************************/
   /****                                                                 ****/
+  /****         P C F   D R I V E R    C O N F I G U R A T I O N        ****/
+  /****                                                                 ****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* There are many PCF fonts just called `Fixed' which look completely    */
+  /* different, and which have nothing to do with each other.  When        */
+  /* selecting `Fixed' in KDE or Gnome one gets results that appear rather */
+  /* random, the style changes often if one changes the size and one       */
+  /* cannot select some fonts at all.  This option makes the PCF module    */
+  /* prepend the foundry name (plus a space) to the family name.           */
+  /*                                                                       */
+  /* We also check whether we have `wide' characters; all put together, we */
+  /* get family names like `Sony Fixed' or `Misc Fixed Wide'.              */
+  /*                                                                       */
+  /* If this option is activated, it can be controlled with the            */
+  /* `no-long-family-names' property of the pcf driver module.             */
+  /*                                                                       */
+#define PCF_CONFIG_OPTION_LONG_FAMILY_NAMES
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /****                                                                 ****/
   /****    A U T O F I T   M O D U L E    C O N F I G U R A T I O N     ****/
   /****                                                                 ****/
   /*************************************************************************/
@@ -886,6 +878,7 @@ FT_BEGIN_HEADER
 #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
 #define  TT_USE_BYTECODE_INTERPRETER
 
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
 #if TT_CONFIG_OPTION_SUBPIXEL_HINTING & 1
 #define  TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
 #endif
@@ -894,6 +887,7 @@ FT_BEGIN_HEADER
 #define  TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
 #endif
 #endif
+#endif
 
 
   /*