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Member "SDL2_ttf-2.20.2/external/freetype/src/autofit/afcjk.h" (25 May 2022, 4191 Bytes) of package /linux/misc/SDL2_ttf-2.20.2.tar.gz:

    1 /****************************************************************************
    2  *
    3  * afcjk.h
    4  *
    5  *   Auto-fitter hinting routines for CJK writing system (specification).
    6  *
    7  * Copyright (C) 2006-2022 by
    8  * David Turner, Robert Wilhelm, and Werner Lemberg.
    9  *
   10  * This file is part of the FreeType project, and may only be used,
   11  * modified, and distributed under the terms of the FreeType project
   12  * license, LICENSE.TXT.  By continuing to use, modify, or distribute
   13  * this file you indicate that you have read the license and
   14  * understand and accept it fully.
   15  *
   16  */
   17 
   18 
   19 #ifndef AFCJK_H_
   20 #define AFCJK_H_
   21 
   22 #include "afhints.h"
   23 #include "aflatin.h"
   24 
   25 
   26 FT_BEGIN_HEADER
   27 
   28 
   29   /* the CJK-specific writing system */
   30 
   31   AF_DECLARE_WRITING_SYSTEM_CLASS( af_cjk_writing_system_class )
   32 
   33 
   34   /*************************************************************************/
   35   /*************************************************************************/
   36   /*****                                                               *****/
   37   /*****              C J K   G L O B A L   M E T R I C S              *****/
   38   /*****                                                               *****/
   39   /*************************************************************************/
   40   /*************************************************************************/
   41 
   42 
   43   /*
   44    * CJK glyphs tend to fill the square.  So we have both vertical and
   45    * horizontal blue zones.  But some glyphs have flat bounding strokes that
   46    * leave some space between neighbour glyphs.
   47    */
   48 
   49 #define AF_CJK_IS_TOP_BLUE( b ) \
   50           ( (b)->properties & AF_BLUE_PROPERTY_CJK_TOP )
   51 #define AF_CJK_IS_HORIZ_BLUE( b ) \
   52           ( (b)->properties & AF_BLUE_PROPERTY_CJK_HORIZ )
   53 #define AF_CJK_IS_RIGHT_BLUE  AF_CJK_IS_TOP_BLUE
   54 
   55 #define AF_CJK_MAX_WIDTHS  16
   56 
   57 
   58 #define AF_CJK_BLUE_ACTIVE      ( 1U << 0 ) /* zone height is <= 3/4px      */
   59 #define AF_CJK_BLUE_TOP         ( 1U << 1 ) /* result of AF_CJK_IS_TOP_BLUE */
   60 #define AF_CJK_BLUE_ADJUSTMENT  ( 1U << 2 ) /* used for scale adjustment    */
   61                                             /* optimization                 */
   62 
   63 
   64   typedef struct  AF_CJKBlueRec_
   65   {
   66     AF_WidthRec  ref;
   67     AF_WidthRec  shoot; /* undershoot */
   68     FT_UInt      flags;
   69 
   70   } AF_CJKBlueRec, *AF_CJKBlue;
   71 
   72 
   73   typedef struct  AF_CJKAxisRec_
   74   {
   75     FT_Fixed       scale;
   76     FT_Pos         delta;
   77 
   78     FT_UInt        width_count;                   /* number of used widths */
   79     AF_WidthRec    widths[AF_CJK_MAX_WIDTHS];     /* widths array          */
   80     FT_Pos         edge_distance_threshold;     /* used for creating edges */
   81     FT_Pos         standard_width;           /* the default stem thickness */
   82     FT_Bool        extra_light;           /* is standard width very light? */
   83 
   84     /* used for horizontal metrics too for CJK */
   85     FT_Bool        control_overshoot;
   86     FT_UInt        blue_count;
   87     AF_CJKBlueRec  blues[AF_BLUE_STRINGSET_MAX];
   88 
   89     FT_Fixed       org_scale;
   90     FT_Pos         org_delta;
   91 
   92   } AF_CJKAxisRec, *AF_CJKAxis;
   93 
   94 
   95   typedef struct  AF_CJKMetricsRec_
   96   {
   97     AF_StyleMetricsRec  root;
   98     FT_UInt             units_per_em;
   99     AF_CJKAxisRec       axis[AF_DIMENSION_MAX];
  100 
  101   } AF_CJKMetricsRec, *AF_CJKMetrics;
  102 
  103 
  104 #ifdef AF_CONFIG_OPTION_CJK
  105   FT_LOCAL( FT_Error )
  106   af_cjk_metrics_init( AF_CJKMetrics  metrics,
  107                        FT_Face        face );
  108 
  109   FT_LOCAL( void )
  110   af_cjk_metrics_scale( AF_CJKMetrics  metrics,
  111                         AF_Scaler      scaler );
  112 
  113   FT_LOCAL( FT_Error )
  114   af_cjk_hints_init( AF_GlyphHints  hints,
  115                      AF_CJKMetrics  metrics );
  116 
  117   FT_LOCAL( FT_Error )
  118   af_cjk_hints_apply( FT_UInt        glyph_index,
  119                       AF_GlyphHints  hints,
  120                       FT_Outline*    outline,
  121                       AF_CJKMetrics  metrics );
  122 
  123   /* shared; called from afindic.c */
  124   FT_LOCAL( void )
  125   af_cjk_metrics_check_digits( AF_CJKMetrics  metrics,
  126                                FT_Face        face );
  127 
  128   FT_LOCAL( void )
  129   af_cjk_metrics_init_widths( AF_CJKMetrics  metrics,
  130                               FT_Face        face );
  131 #endif /* AF_CONFIG_OPTION_CJK */
  132 
  133 
  134 /* */
  135 
  136 FT_END_HEADER
  137 
  138 #endif /* AFCJK_H_ */
  139 
  140 
  141 /* END */