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diff --git a/src/freetype/aflatin.h b/src/freetype/aflatin.h
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+/***************************************************************************/
+/*                                                                         */
+/*  aflatin.h                                                              */
+/*                                                                         */
+/*    Auto-fitter hinting routines for latin writing system                */
+/*    (specification).                                                     */
+/*                                                                         */
+/*  Copyright 2003-2018 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 AFLATIN_H_
+#define AFLATIN_H_
+
+#include "afhints.h"
+
+
+FT_BEGIN_HEADER
+
+  /* the `latin' writing system */
+
+  AF_DECLARE_WRITING_SYSTEM_CLASS( af_latin_writing_system_class )
+
+
+  /* constants are given with units_per_em == 2048 in mind */
+#define AF_LATIN_CONSTANT( metrics, c )                                      \
+  ( ( (c) * (FT_Long)( (AF_LatinMetrics)(metrics) )->units_per_em ) / 2048 )
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****            L A T I N   G L O B A L   M E T R I C S            *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  /*
+   *  The following declarations could be embedded in the file `aflatin.c';
+   *  they have been made semi-public to allow alternate writing system
+   *  hinters to re-use some of them.
+   */
+
+
+#define AF_LATIN_IS_TOP_BLUE( b ) \
+          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_TOP )
+#define AF_LATIN_IS_SUB_TOP_BLUE( b ) \
+          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_SUB_TOP )
+#define AF_LATIN_IS_NEUTRAL_BLUE( b ) \
+          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_NEUTRAL )
+#define AF_LATIN_IS_X_HEIGHT_BLUE( b ) \
+          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_X_HEIGHT )
+#define AF_LATIN_IS_LONG_BLUE( b ) \
+          ( (b)->properties & AF_BLUE_PROPERTY_LATIN_LONG )
+
+#define AF_LATIN_MAX_WIDTHS  16
+
+
+#define AF_LATIN_BLUE_ACTIVE      ( 1U << 0 ) /* zone height is <= 3/4px   */
+#define AF_LATIN_BLUE_TOP         ( 1U << 1 ) /* we have a top blue zone   */
+#define AF_LATIN_BLUE_SUB_TOP     ( 1U << 2 ) /* we have a subscript top   */
+                                              /* blue zone                 */
+#define AF_LATIN_BLUE_NEUTRAL     ( 1U << 3 ) /* we have neutral blue zone */
+#define AF_LATIN_BLUE_ADJUSTMENT  ( 1U << 4 ) /* used for scale adjustment */
+                                              /* optimization              */
+
+
+  typedef struct  AF_LatinBlueRec_
+  {
+    AF_WidthRec  ref;
+    AF_WidthRec  shoot;
+    FT_Pos       ascender;
+    FT_Pos       descender;
+    FT_UInt      flags;
+
+  } AF_LatinBlueRec, *AF_LatinBlue;
+
+
+  typedef struct  AF_LatinAxisRec_
+  {
+    FT_Fixed         scale;
+    FT_Pos           delta;
+
+    FT_UInt          width_count;                 /* number of used widths */
+    AF_WidthRec      widths[AF_LATIN_MAX_WIDTHS]; /* widths array          */
+    FT_Pos           edge_distance_threshold;   /* used for creating edges */
+    FT_Pos           standard_width;         /* the default stem thickness */
+    FT_Bool          extra_light;         /* is standard width very light? */
+
+    /* ignored for horizontal metrics */
+    FT_UInt          blue_count;
+    AF_LatinBlueRec  blues[AF_BLUE_STRINGSET_MAX];
+
+    FT_Fixed         org_scale;
+    FT_Pos           org_delta;
+
+  } AF_LatinAxisRec, *AF_LatinAxis;
+
+
+  typedef struct  AF_LatinMetricsRec_
+  {
+    AF_StyleMetricsRec  root;
+    FT_UInt             units_per_em;
+    AF_LatinAxisRec     axis[AF_DIMENSION_MAX];
+
+  } AF_LatinMetricsRec, *AF_LatinMetrics;
+
+
+  FT_LOCAL( FT_Error )
+  af_latin_metrics_init( AF_LatinMetrics  metrics,
+                         FT_Face          face );
+
+  FT_LOCAL( void )
+  af_latin_metrics_scale( AF_LatinMetrics  metrics,
+                          AF_Scaler        scaler );
+
+  FT_LOCAL( void )
+  af_latin_metrics_init_widths( AF_LatinMetrics  metrics,
+                                FT_Face          face );
+
+  FT_LOCAL( void )
+  af_latin_metrics_check_digits( AF_LatinMetrics  metrics,
+                                 FT_Face          face );
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****           L A T I N   G L Y P H   A N A L Y S I S             *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+#define AF_LATIN_HINTS_HORZ_SNAP    ( 1U << 0 ) /* stem width snapping  */
+#define AF_LATIN_HINTS_VERT_SNAP    ( 1U << 1 ) /* stem height snapping */
+#define AF_LATIN_HINTS_STEM_ADJUST  ( 1U << 2 ) /* stem width/height    */
+                                                /* adjustment           */
+#define AF_LATIN_HINTS_MONO         ( 1U << 3 ) /* monochrome rendering */
+
+
+#define AF_LATIN_HINTS_DO_HORZ_SNAP( h )             \
+  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP )
+
+#define AF_LATIN_HINTS_DO_VERT_SNAP( h )             \
+  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP )
+
+#define AF_LATIN_HINTS_DO_STEM_ADJUST( h )             \
+  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST )
+
+#define AF_LATIN_HINTS_DO_MONO( h )             \
+  AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO )
+
+
+  /*
+   *  The next functions shouldn't normally be exported.  However, other
+   *  writing systems might like to use these functions as-is.
+   */
+  FT_LOCAL( FT_Error )
+  af_latin_hints_compute_segments( AF_GlyphHints  hints,
+                                   AF_Dimension   dim );
+
+  FT_LOCAL( void )
+  af_latin_hints_link_segments( AF_GlyphHints  hints,
+                                FT_UInt        width_count,
+                                AF_WidthRec*   widths,
+                                AF_Dimension   dim );
+
+  FT_LOCAL( FT_Error )
+  af_latin_hints_compute_edges( AF_GlyphHints  hints,
+                                AF_Dimension   dim );
+
+  FT_LOCAL( FT_Error )
+  af_latin_hints_detect_features( AF_GlyphHints  hints,
+                                  FT_UInt        width_count,
+                                  AF_WidthRec*   widths,
+                                  AF_Dimension   dim );
+
+/* */
+
+FT_END_HEADER
+
+#endif /* AFLATIN_H_ */
+
+
+/* END */