kc3-lang/freetype/src/autofit/afcjk.h

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  Date : 2025-09-06T06:14:03
  

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• src/autofit/afcjk.h

• /****************************************************************************
   *
   * afcjk.h
   *
   *   Auto-fitter hinting routines for CJK writing system (specification).
   *
   * Copyright (C) 2006-2025 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 AFCJK_H_
  #define AFCJK_H_
  
  #include "afhints.h"
  #include "aflatin.h"
  
  
  FT_BEGIN_HEADER
  
  
    /* the CJK-specific writing system */
  
    AF_DECLARE_WRITING_SYSTEM_CLASS( af_cjk_writing_system_class )
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****              C J K   G L O B A L   M E T R I C S              *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    /*
     * CJK glyphs tend to fill the square.  So we have both vertical and
     * horizontal blue zones.  But some glyphs have flat bounding strokes that
     * leave some space between neighbour glyphs.
     */
  
  #define AF_CJK_IS_TOP_BLUE( b ) \
            ( (b)->properties & AF_BLUE_PROPERTY_CJK_TOP )
  #define AF_CJK_IS_HORIZ_BLUE( b ) \
            ( (b)->properties & AF_BLUE_PROPERTY_CJK_HORIZ )
  #define AF_CJK_IS_RIGHT_BLUE  AF_CJK_IS_TOP_BLUE
  
  #define AF_CJK_MAX_WIDTHS  16
  
  
  #define AF_CJK_BLUE_ACTIVE      ( 1U << 0 ) /* zone height is <= 3/4px      */
  #define AF_CJK_BLUE_TOP         ( 1U << 1 ) /* result of AF_CJK_IS_TOP_BLUE */
  #define AF_CJK_BLUE_ADJUSTMENT  ( 1U << 2 ) /* used for scale adjustment    */
                                              /* optimization                 */
  
  
    typedef struct  AF_CJKBlueRec_
    {
      AF_WidthRec  ref;
      AF_WidthRec  shoot; /* undershoot */
      FT_UInt      flags;
  
    } AF_CJKBlueRec, *AF_CJKBlue;
  
  
    typedef struct  AF_CJKAxisRec_
    {
      FT_Fixed       scale;
      FT_Pos         delta;
  
      FT_UInt        width_count;                   /* number of used widths */
      AF_WidthRec    widths[AF_CJK_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? */
  
      /* used for horizontal metrics too for CJK */
      FT_Bool        control_overshoot;
      FT_UInt        blue_count;
      AF_CJKBlueRec  blues[AF_BLUE_STRINGSET_MAX_LEN];
  
      FT_Fixed       org_scale;
      FT_Pos         org_delta;
  
    } AF_CJKAxisRec, *AF_CJKAxis;
  
  
    typedef struct  AF_CJKMetricsRec_
    {
      AF_StyleMetricsRec  root;
      FT_UInt             units_per_em;
      AF_CJKAxisRec       axis[AF_DIMENSION_MAX];
  
    } AF_CJKMetricsRec, *AF_CJKMetrics;
  
  
  #ifdef AF_CONFIG_OPTION_CJK
    FT_LOCAL( FT_Error )
    af_cjk_metrics_init( AF_StyleMetrics  metrics,
                         FT_Face          face );
  
    FT_LOCAL( void )
    af_cjk_metrics_scale( AF_StyleMetrics  metrics,
                          AF_Scaler        scaler );
  
    FT_LOCAL( FT_Error )
    af_cjk_hints_init( AF_GlyphHints    hints,
                       AF_StyleMetrics  metrics );
  
    FT_LOCAL( FT_Error )
    af_cjk_hints_apply( FT_UInt          glyph_index,
                        AF_GlyphHints    hints,
                        FT_Outline*      outline,
                        AF_StyleMetrics  metrics );
  
    /* shared; called from afindic.c */
    FT_LOCAL( void )
    af_cjk_metrics_check_digits( AF_CJKMetrics  metrics,
                                 FT_Face        face );
  
    FT_LOCAL( void )
    af_cjk_metrics_init_widths( AF_CJKMetrics  metrics,
                                FT_Face        face );
  #endif /* AF_CONFIG_OPTION_CJK */
  
  
  /* */
  
  FT_END_HEADER
  
  #endif /* AFCJK_H_ */
  
  
  /* END */
  

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