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, 205 insertions, 0 deletions

diff --git a/freetype/include/freetype/ftparams.h b/freetype/include/freetype/ftparams.h
new file mode 100644
index 000000000..5a9006c50
--- /dev/null
+++ b/freetype/include/freetype/ftparams.h
@@ -0,0 +1,205 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ftparams.h                                                             */
+/*                                                                         */
+/*    FreeType API for possible FT_Parameter tags (specification only).    */
+/*                                                                         */
+/*  Copyright 2017-2018 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 FTPARAMS_H_
+#define FTPARAMS_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
+
+
+  /**************************************************************************
+   *
+   * @section:
+   *   parameter_tags
+   *
+   * @title:
+   *   Parameter Tags
+   *
+   * @abstract:
+   *   Macros for driver property and font loading parameter tags.
+   *
+   * @description:
+   *   This section contains macros for the @FT_Parameter structure that are
+   *   used with various functions to activate some special functionality or
+   *   different behaviour of various components of FreeType.
+   *
+   */
+
+
+  /***************************************************************************
+   *
+   * @constant:
+   *   FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY
+   *
+   * @description:
+   *   A tag for @FT_Parameter to make @FT_Open_Face ignore typographic
+   *   family names in the `name' table (introduced in OpenType version
+   *   1.4).  Use this for backward compatibility with legacy systems that
+   *   have a four-faces-per-family restriction.
+   *
+   * @since:
+   *   2.8
+   *
+   */
+#define FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY \
+          FT_MAKE_TAG( 'i', 'g', 'p', 'f' )
+
+
+  /* this constant is deprecated */
+#define FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY \
+          FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY
+
+
+  /***************************************************************************
+   *
+   * @constant:
+   *   FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY
+   *
+   * @description:
+   *   A tag for @FT_Parameter to make @FT_Open_Face ignore typographic
+   *   subfamily names in the `name' table (introduced in OpenType version
+   *   1.4).  Use this for backward compatibility with legacy systems that
+   *   have a four-faces-per-family restriction.
+   *
+   * @since:
+   *   2.8
+   *
+   */
+#define FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY \
+          FT_MAKE_TAG( 'i', 'g', 'p', 's' )
+
+
+  /* this constant is deprecated */
+#define FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY \
+          FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY
+
+
+  /***************************************************************************
+   *
+   * @constant:
+   *   FT_PARAM_TAG_INCREMENTAL
+   *
+   * @description:
+   *   An @FT_Parameter tag to be used with @FT_Open_Face to indicate
+   *   incremental glyph loading.
+   *
+   */
+#define FT_PARAM_TAG_INCREMENTAL \
+          FT_MAKE_TAG( 'i', 'n', 'c', 'r' )
+
+
+  /**************************************************************************
+   *
+   * @constant:
+   *   FT_PARAM_TAG_LCD_FILTER_WEIGHTS
+   *
+   * @description:
+   *   An @FT_Parameter tag to be used with @FT_Face_Properties.  The
+   *   corresponding argument specifies the five LCD filter weights for a
+   *   given face (if using @FT_LOAD_TARGET_LCD, for example), overriding
+   *   the global default values or the values set up with
+   *   @FT_Library_SetLcdFilterWeights.
+   *
+   * @since:
+   *   2.8
+   *
+   */
+#define FT_PARAM_TAG_LCD_FILTER_WEIGHTS \
+          FT_MAKE_TAG( 'l', 'c', 'd', 'f' )
+
+
+  /**************************************************************************
+   *
+   * @constant:
+   *   FT_PARAM_TAG_RANDOM_SEED
+   *
+   * @description:
+   *   An @FT_Parameter tag to be used with @FT_Face_Properties.  The
+   *   corresponding 32bit signed integer argument overrides the font
+   *   driver's random seed value with a face-specific one; see
+   *   @random-seed.
+   *
+   * @since:
+   *   2.8
+   *
+   */
+#define FT_PARAM_TAG_RANDOM_SEED \
+          FT_MAKE_TAG( 's', 'e', 'e', 'd' )
+
+
+  /**************************************************************************
+   *
+   * @constant:
+   *   FT_PARAM_TAG_STEM_DARKENING
+   *
+   * @description:
+   *   An @FT_Parameter tag to be used with @FT_Face_Properties.  The
+   *   corresponding Boolean argument specifies whether to apply stem
+   *   darkening, overriding the global default values or the values set up
+   *   with @FT_Property_Set (see @no-stem-darkening).
+   *
+   *   This is a passive setting that only takes effect if the font driver
+   *   or autohinter honors it, which the CFF, Type~1, and CID drivers
+   *   always do, but the autohinter only in `light' hinting mode (as of
+   *   version 2.9).
+   *
+   * @since:
+   *   2.8
+   *
+   */
+#define FT_PARAM_TAG_STEM_DARKENING \
+          FT_MAKE_TAG( 'd', 'a', 'r', 'k' )
+
+
+ /***************************************************************************
+  *
+  * @constant:
+  *   FT_PARAM_TAG_UNPATENTED_HINTING
+  *
+  * @description:
+  *   Deprecated, no effect.
+  *
+  *   Previously: A constant used as the tag of an @FT_Parameter structure to
+  *   indicate that unpatented methods only should be used by the TrueType
+  *   bytecode interpreter for a typeface opened by @FT_Open_Face.
+  *
+  */
+#define FT_PARAM_TAG_UNPATENTED_HINTING \
+          FT_MAKE_TAG( 'u', 'n', 'p', 'a' )
+
+
+  /* */
+
+
+FT_END_HEADER
+
+
+#endif /* FTPARAMS_H_ */
+
+
+/* END */