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diff --git a/src/freetype/pshalgo.h b/src/freetype/pshalgo.h
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+/***************************************************************************/
+/*                                                                         */
+/*  pshalgo.h                                                              */
+/*                                                                         */
+/*    PostScript hinting algorithm (specification).                        */
+/*                                                                         */
+/*  Copyright 2001-2018 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 PSHALGO_H_
+#define PSHALGO_H_
+
+
+#include "pshrec.h"
+#include "pshglob.h"
+
+
+FT_BEGIN_HEADER
+
+
+  /* handle to Hint structure */
+  typedef struct PSH_HintRec_*  PSH_Hint;
+
+
+  /* hint bit-flags */
+#define PSH_HINT_GHOST   PS_HINT_FLAG_GHOST
+#define PSH_HINT_BOTTOM  PS_HINT_FLAG_BOTTOM
+#define PSH_HINT_ACTIVE  4U
+#define PSH_HINT_FITTED  8U
+
+
+#define psh_hint_is_active( x )  ( ( (x)->flags & PSH_HINT_ACTIVE ) != 0 )
+#define psh_hint_is_ghost( x )   ( ( (x)->flags & PSH_HINT_GHOST  ) != 0 )
+#define psh_hint_is_fitted( x )  ( ( (x)->flags & PSH_HINT_FITTED ) != 0 )
+
+#define psh_hint_activate( x )    (x)->flags |=  PSH_HINT_ACTIVE
+#define psh_hint_deactivate( x )  (x)->flags &= ~PSH_HINT_ACTIVE
+#define psh_hint_set_fitted( x )  (x)->flags |=  PSH_HINT_FITTED
+
+
+  /* hint structure */
+  typedef struct  PSH_HintRec_
+  {
+    FT_Int    org_pos;
+    FT_Int    org_len;
+    FT_Pos    cur_pos;
+    FT_Pos    cur_len;
+    FT_UInt   flags;
+    PSH_Hint  parent;
+    FT_Int    order;
+
+  } PSH_HintRec;
+
+
+  /* this is an interpolation zone used for strong points;  */
+  /* weak points are interpolated according to their strong */
+  /* neighbours                                             */
+  typedef struct  PSH_ZoneRec_
+  {
+    FT_Fixed  scale;
+    FT_Fixed  delta;
+    FT_Pos    min;
+    FT_Pos    max;
+
+  } PSH_ZoneRec, *PSH_Zone;
+
+
+  typedef struct  PSH_Hint_TableRec_
+  {
+    FT_UInt        max_hints;
+    FT_UInt        num_hints;
+    PSH_Hint       hints;
+    PSH_Hint*      sort;
+    PSH_Hint*      sort_global;
+    FT_UInt        num_zones;
+    PSH_ZoneRec*   zones;
+    PSH_Zone       zone;
+    PS_Mask_Table  hint_masks;
+    PS_Mask_Table  counter_masks;
+
+  } PSH_Hint_TableRec, *PSH_Hint_Table;
+
+
+  typedef struct PSH_PointRec_*    PSH_Point;
+  typedef struct PSH_ContourRec_*  PSH_Contour;
+
+  enum
+  {
+    PSH_DIR_NONE  =  4,
+    PSH_DIR_UP    = -1,
+    PSH_DIR_DOWN  =  1,
+    PSH_DIR_LEFT  = -2,
+    PSH_DIR_RIGHT =  2
+  };
+
+#define PSH_DIR_HORIZONTAL  2
+#define PSH_DIR_VERTICAL    1
+
+#define PSH_DIR_COMPARE( d1, d2 )   ( (d1) == (d2) || (d1) == -(d2) )
+#define PSH_DIR_IS_HORIZONTAL( d )  PSH_DIR_COMPARE( d, PSH_DIR_HORIZONTAL )
+#define PSH_DIR_IS_VERTICAL( d )    PSH_DIR_COMPARE( d, PSH_DIR_VERTICAL )
+
+
+  /* the following bit-flags are computed once by the glyph */
+  /* analyzer, for both dimensions                          */
+#define PSH_POINT_OFF     1U      /* point is off the curve */
+#define PSH_POINT_SMOOTH  2U      /* point is smooth        */
+#define PSH_POINT_INFLEX  4U      /* point is inflection    */
+
+
+#define psh_point_is_smooth( p )  ( (p)->flags & PSH_POINT_SMOOTH )
+#define psh_point_is_off( p )     ( (p)->flags & PSH_POINT_OFF    )
+#define psh_point_is_inflex( p )  ( (p)->flags & PSH_POINT_INFLEX )
+
+#define psh_point_set_smooth( p )  (p)->flags |= PSH_POINT_SMOOTH
+#define psh_point_set_off( p )     (p)->flags |= PSH_POINT_OFF
+#define psh_point_set_inflex( p )  (p)->flags |= PSH_POINT_INFLEX
+
+
+  /* the following bit-flags are re-computed for each dimension */
+#define PSH_POINT_STRONG      16U /* point is strong                           */
+#define PSH_POINT_FITTED      32U /* point is already fitted                   */
+#define PSH_POINT_EXTREMUM    64U /* point is local extremum                   */
+#define PSH_POINT_POSITIVE   128U /* extremum has positive contour flow        */
+#define PSH_POINT_NEGATIVE   256U /* extremum has negative contour flow        */
+#define PSH_POINT_EDGE_MIN   512U /* point is aligned to left/bottom stem edge */
+#define PSH_POINT_EDGE_MAX  1024U /* point is aligned to top/right stem edge   */
+
+
+#define psh_point_is_strong( p )    ( (p)->flags2 & PSH_POINT_STRONG )
+#define psh_point_is_fitted( p )    ( (p)->flags2 & PSH_POINT_FITTED )
+#define psh_point_is_extremum( p )  ( (p)->flags2 & PSH_POINT_EXTREMUM )
+#define psh_point_is_positive( p )  ( (p)->flags2 & PSH_POINT_POSITIVE )
+#define psh_point_is_negative( p )  ( (p)->flags2 & PSH_POINT_NEGATIVE )
+#define psh_point_is_edge_min( p )  ( (p)->flags2 & PSH_POINT_EDGE_MIN )
+#define psh_point_is_edge_max( p )  ( (p)->flags2 & PSH_POINT_EDGE_MAX )
+
+#define psh_point_set_strong( p )    (p)->flags2 |= PSH_POINT_STRONG
+#define psh_point_set_fitted( p )    (p)->flags2 |= PSH_POINT_FITTED
+#define psh_point_set_extremum( p )  (p)->flags2 |= PSH_POINT_EXTREMUM
+#define psh_point_set_positive( p )  (p)->flags2 |= PSH_POINT_POSITIVE
+#define psh_point_set_negative( p )  (p)->flags2 |= PSH_POINT_NEGATIVE
+#define psh_point_set_edge_min( p )  (p)->flags2 |= PSH_POINT_EDGE_MIN
+#define psh_point_set_edge_max( p )  (p)->flags2 |= PSH_POINT_EDGE_MAX
+
+
+  typedef struct  PSH_PointRec_
+  {
+    PSH_Point    prev;
+    PSH_Point    next;
+    PSH_Contour  contour;
+    FT_UInt      flags;
+    FT_UInt      flags2;
+    FT_Char      dir_in;
+    FT_Char      dir_out;
+    PSH_Hint     hint;
+    FT_Pos       org_u;
+    FT_Pos       org_v;
+    FT_Pos       cur_u;
+#ifdef DEBUG_HINTER
+    FT_Pos       org_x;
+    FT_Pos       cur_x;
+    FT_Pos       org_y;
+    FT_Pos       cur_y;
+    FT_UInt      flags_x;
+    FT_UInt      flags_y;
+#endif
+
+  } PSH_PointRec;
+
+
+  typedef struct  PSH_ContourRec_
+  {
+    PSH_Point  start;
+    FT_UInt    count;
+
+  } PSH_ContourRec;
+
+
+  typedef struct  PSH_GlyphRec_
+  {
+    FT_UInt            num_points;
+    FT_UInt            num_contours;
+
+    PSH_Point          points;
+    PSH_Contour        contours;
+
+    FT_Memory          memory;
+    FT_Outline*        outline;
+    PSH_Globals        globals;
+    PSH_Hint_TableRec  hint_tables[2];
+
+    FT_Bool            vertical;
+    FT_Int             major_dir;
+    FT_Int             minor_dir;
+
+    FT_Bool            do_horz_hints;
+    FT_Bool            do_vert_hints;
+    FT_Bool            do_horz_snapping;
+    FT_Bool            do_vert_snapping;
+    FT_Bool            do_stem_adjust;
+
+  } PSH_GlyphRec, *PSH_Glyph;
+
+
+#ifdef DEBUG_HINTER
+  extern PSH_Hint_Table  ps_debug_hint_table;
+
+  typedef void
+  (*PSH_HintFunc)( PSH_Hint  hint,
+                   FT_Bool   vertical );
+
+  extern PSH_HintFunc    ps_debug_hint_func;
+
+  extern PSH_Glyph       ps_debug_glyph;
+#endif
+
+
+  extern FT_Error
+  ps_hints_apply( PS_Hints        ps_hints,
+                  FT_Outline*     outline,
+                  PSH_Globals     globals,
+                  FT_Render_Mode  hint_mode );
+
+
+FT_END_HEADER
+
+
+#endif /* PSHALGO_H_ */
+
+
+/* END */