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

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• Hash : 98e510ee
  Author :
  Date : 2014-04-20T22:11:27
  

  [autofit] Fix Savannah bug #42148.
  
  The adaptation of the cjk auto-hinter module to blue stringsets in
  2013-08-25 had three severe bugs.  Mea culpa.
  
  1. Contrary to the latin auto-hinter, characters for reference and
     overshoot values of a blue zone are specified separately.  Due to
     the screwed-up change it didn't work at all.
  
  2. A boolean comparison was erroneously replaced with a cast,
     causing invalid results with the `^' operator later on.  The
     visual artifact caused by this problem is the topic of the bug
     report.
  
  3. Two flag values were inverted, causing incorrect assignment of
     reference and overshoot values.
  
  * src/autofit/afblue.dat: Fix CJK bluestrings, introducing a new
  syntax to have both reference and overshoot characters in a single
  string.  This is error #1.
  Add extensive comments.
  
  * src/autofit/afblue.hin (AF_BLUE_PROPERTY_CJK_FILL): Removed, no
  longer used.
  (AF_BLUE_PROPERTY_CJK_TOP, AF_BLUE_PROPERTY_CJK_HORIZ): Fix values.
  This is error #3.
  
  * src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
  
  * src/autofit/afcjk.c (af_cjk_metrics_init_blues): Correct error #1.
  Use character `|' to separate characters for reference and overshoot
  values.
  Improve tracing messages, synchronizing them with the latin
  auto-hinter.
  (af_cjk_hints_compute_blue_edges): Fix value of `is_top_right_blue'.
  This is error #2.
  (af_cjk_align_linked_edge): Add tracing message.
  
  * src/autofit/afcjk.h (AF_CJK_IS_FILLED_BLUE): Removed, no longer
  used.
  

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• src/autofit/afcjk.h

• /***************************************************************************/
  /*                                                                         */
  /*  afcjk.h                                                                */
  /*                                                                         */
  /*    Auto-fitter hinting routines for CJK writing system (specification). */
  /*                                                                         */
  /*  Copyright 2006, 2007, 2011-2014 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
  
  
    enum
    {
      AF_CJK_BLUE_ACTIVE     = 1 << 0,  /* set if zone height is <= 3/4px */
      AF_CJK_BLUE_TOP        = 1 << 1,  /* result of AF_CJK_IS_TOP_BLUE   */
      AF_CJK_BLUE_ADJUSTMENT = 1 << 2,  /* used for scale adjustment      */
                                        /* optimization                   */
      AF_CJK_BLUE_FLAG_MAX
    };
  
  
    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( 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 */
  

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