afcjk.h

Go to the documentation of this file.

/***************************************************************************/
/*                                                                         */
/*  afcjk.h                                                                */
/*                                                                         */
/*    Auto-fitter hinting routines for CJK writing system (specification). */
/*                                                                         */
/*  Copyright 2006-2018 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 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];
 
    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_CJKMetrics  metrics,
                       FT_Face        face );
 
  FT_LOCAL( void )
  af_cjk_metrics_scale( AF_CJKMetrics  metrics,
                        AF_Scaler      scaler );
 
  FT_LOCAL( FT_Error )
  af_cjk_hints_init( AF_GlyphHints  hints,
                     AF_CJKMetrics  metrics );
 
  FT_LOCAL( FT_Error )
  af_cjk_hints_apply( FT_UInt        glyph_index,
                      AF_GlyphHints  hints,
                      FT_Outline*    outline,
                      AF_CJKMetrics  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 */