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

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  Date : 2007-04-03T07:19:53
  

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• src/autofit/aflatin.h

• /***************************************************************************/
  /*                                                                         */
  /*  aflatin.h                                                              */
  /*                                                                         */
  /*    Auto-fitter hinting routines for latin script (specification).       */
  /*                                                                         */
  /*  Copyright 2003, 2004, 2005, 2006, 2007 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-specific script class */
  
    FT_CALLBACK_TABLE const AF_ScriptClassRec
    af_latin_script_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 script hinters to
     *  re-use some of them.
     */
  
  
    /* Latin (global) metrics management */
  
    enum
    {
      AF_LATIN_BLUE_CAPITAL_TOP,
      AF_LATIN_BLUE_CAPITAL_BOTTOM,
      AF_LATIN_BLUE_SMALL_F_TOP,
      AF_LATIN_BLUE_SMALL_TOP,
      AF_LATIN_BLUE_SMALL_BOTTOM,
      AF_LATIN_BLUE_SMALL_MINOR,
  
      AF_LATIN_BLUE_MAX
    };
  
  
  #define AF_LATIN_IS_TOP_BLUE( b )  ( (b) == AF_LATIN_BLUE_CAPITAL_TOP || \
                                       (b) == AF_LATIN_BLUE_SMALL_F_TOP || \
                                       (b) == AF_LATIN_BLUE_SMALL_TOP   )
  
  #define AF_LATIN_MAX_WIDTHS  16
  #define AF_LATIN_MAX_BLUES   AF_LATIN_BLUE_MAX
  
  
    enum
    {
      AF_LATIN_BLUE_ACTIVE     = 1 << 0,
      AF_LATIN_BLUE_TOP        = 1 << 1,
      AF_LATIN_BLUE_ADJUSTMENT = 1 << 2,  /* used for scale adjustment */
                                          /* optimization              */
      AF_LATIN_BLUE_FLAG_MAX
    };
  
  
    typedef struct  AF_LatinBlueRec_
    {
      AF_WidthRec  ref;
      AF_WidthRec  shoot;
      FT_UInt      flags;
  
    } AF_LatinBlueRec, *AF_LatinBlue;
  
  
    typedef struct  AF_LatinAxisRec_
    {
      FT_Fixed         scale;
      FT_Pos           delta;
  
      FT_UInt          width_count;
      AF_WidthRec      widths[AF_LATIN_MAX_WIDTHS];
      FT_Pos           edge_distance_threshold;
      FT_Pos           standard_width;
      FT_Bool          extra_light;
  
      /* ignored for horizontal metrics */
      FT_Bool          control_overshoot;
      FT_UInt          blue_count;
      AF_LatinBlueRec  blues[AF_LATIN_BLUE_MAX];
  
      FT_Fixed         org_scale;
      FT_Pos           org_delta;
  
    } AF_LatinAxisRec, *AF_LatinAxis;
  
  
    typedef struct  AF_LatinMetricsRec_
    {
      AF_ScriptMetricsRec  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_ULong         charcode );
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****           L A T I N   G L Y P H   A N A L Y S I S             *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    enum
    {
      AF_LATIN_HINTS_HORZ_SNAP   = 1 << 0, /* enable stem width snapping  */
      AF_LATIN_HINTS_VERT_SNAP   = 1 << 1, /* enable stem height snapping */
      AF_LATIN_HINTS_STEM_ADJUST = 1 << 2, /* enable stem width/height    */
                                           /* adjustment                  */
      AF_LATIN_HINTS_MONO        = 1 << 3  /* indicate 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 )
  
  
    /*
     *  This shouldn't normally be exported.  However, other scripts might
     *  like to use this function as-is.
     */
    FT_LOCAL( FT_Error )
    af_latin_hints_compute_segments( AF_GlyphHints  hints,
                                     AF_Dimension   dim );
  
    /*
     *  This shouldn't normally be exported.  However, other scripts might
     *  want to use this function as-is.
     */
    FT_LOCAL( void )
    af_latin_hints_link_segments( AF_GlyphHints  hints,
                                  AF_Dimension   dim );
  
    /*
     *  This shouldn't normally be exported.  However, other scripts might
     *  want to use this function as-is.
     */
    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,
                                    AF_Dimension   dim );
  
  /* */
  
  FT_END_HEADER
  
  #endif /* __AFLATIN_H__ */
  
  
  /* END */
  

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