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

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• Hash : e664efad
  Author :
  Date : 2004-06-04T17:41:59
  

  * src/autofit/*: important fixes to the auto-fitter. The output now seems to be 100% equivalent to the auto-hinter, while being about 2% faster (which proves that script-specific algorithm selection isn't a performance problem). to test it, change "autohint" to "autofit" in <freetype/config/ftmodule.h> and recompile. a few more testing is needed before making this the official auto-hinting module

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• src/autofit/afhints.h

• #ifndef __AFHINTS_H__
  #define __AFHINTS_H__
  
  #include "aftypes.h"
  
  FT_BEGIN_HEADER
  
   /*
    *  The definition of outline glyph hints. These are shared by all
    *  script analysis routines (until now)
    *
    */
  
    typedef enum
    {
      AF_DIMENSION_HORZ = 0,  /* x coordinates, i.e. vertical segments & edges   */
      AF_DIMENSION_VERT = 1,  /* y coordinates, i.e. horizontal segments & edges */
  
      AF_DIMENSION_MAX  /* do not remove */
  
    } AF_Dimension;
  
  
    /* hint directions -- the values are computed so that two vectors are */
    /* in opposite directions iff `dir1+dir2 == 0'                        */
    typedef enum
    {
      AF_DIR_NONE  =  4,
      AF_DIR_RIGHT =  1,
      AF_DIR_LEFT  = -1,
      AF_DIR_UP    =  2,
      AF_DIR_DOWN  = -2
  
    } AF_Direction;
  
  
    /* point hint flags */
    typedef enum
    {
      AF_FLAG_NONE    = 0,
  
     /* point type flags */
      AF_FLAG_CONIC   = (1 << 0),
      AF_FLAG_CUBIC   = (1 << 1),
      AF_FLAG_CONTROL = AF_FLAG_CONIC | AF_FLAG_CUBIC,
  
     /* point extremum flags */
      AF_FLAG_EXTREMA_X = (1 << 2),
      AF_FLAG_EXTREMA_Y = (1 << 3),
  
     /* point roundness flags */
      AF_FLAG_ROUND_X = (1 << 4),
      AF_FLAG_ROUND_Y = (1 << 5),
  
     /* point touch flags */
      AF_FLAG_TOUCH_X = (1 << 6),
      AF_FLAG_TOUCH_Y = (1 << 7),
  
     /* candidates for weak interpolation have this flag set */
      AF_FLAG_WEAK_INTERPOLATION = (1 << 8),
  
     /* all inflection points in the outline have this flag set */
      AF_FLAG_INFLECTION         = (1 << 9)
  
    } AF_Flags;
  
  
    /* edge hint flags */
    typedef enum
    {
      AF_EDGE_NORMAL = 0,
      AF_EDGE_ROUND  = (1 << 0),
      AF_EDGE_SERIF  = (1 << 1),
      AF_EDGE_DONE   = (1 << 2)
  
    } AF_Edge_Flags;
  
  
  
    typedef struct AF_PointRec_*    AF_Point;
    typedef struct AF_SegmentRec_*  AF_Segment;
    typedef struct AF_EdgeRec_*     AF_Edge;
  
  
    typedef struct  AF_PointRec_
    {
      AF_Flags      flags;    /* point flags used by hinter */
      FT_Pos        ox, oy;   /* original, scaled position  */
      FT_Pos        fx, fy;   /* original, unscaled position (font units) */
      FT_Pos        x,  y;    /* current position */
      FT_Pos        u,  v;    /* current (x,y) or (y,x) depending on context */
  
      AF_Direction  in_dir;   /* direction of inwards vector  */
      AF_Direction  out_dir;  /* direction of outwards vector */
  
      AF_Point      next;     /* next point in contour     */
      AF_Point      prev;     /* previous point in contour */
  
    } AF_PointRec;
  
  
    typedef struct  AF_SegmentRec_
    {
      AF_Edge_Flags  flags;       /* edge/segment flags for this segment */
      AF_Direction   dir;         /* segment direction                   */
      FT_Pos         pos;         /* position of segment                 */
      FT_Pos         min_coord;   /* minimum coordinate of segment       */
      FT_Pos         max_coord;   /* maximum coordinate of segment       */
  
      AF_Edge        edge;        /* the segment's parent edge */
      AF_Segment     edge_next;   /* link to next segment in parent edge */
  
      AF_Segment     link;        /* (stem) link segment        */
      AF_Segment     serif;       /* primary segment for serifs */
      FT_Pos         num_linked;  /* number of linked segments  */
      FT_Pos         score;       /* used during stem matching  */
  
      AF_Point       first;       /* first point in edge segment             */
      AF_Point       last;        /* last point in edge segment              */
      AF_Point*      contour;     /* ptr to first point of segment's contour */
  
    } AF_SegmentRec;
  
  
    typedef struct  AF_EdgeRec_
    {
      FT_Pos         fpos;       /* original, unscaled position (font units) */
      FT_Pos         opos;       /* original, scaled position                */
      FT_Pos         pos;        /* current position                         */
  
      AF_Edge_Flags  flags;      /* edge flags */
      AF_Direction   dir;        /* edge direction */
      FT_Fixed       scale;      /* used to speed up interpolation between edges */
      AF_Width       blue_edge;  /* non-NULL if this is a blue edge              */
  
      AF_Edge        link;
      AF_Edge        serif;
      FT_Int         num_linked;
  
      FT_Int         score;
  
      AF_Segment     first;
      AF_Segment     last;
  
    } AF_EdgeRec;
  
  
    typedef struct AF_AxisHintsRec_
    {
      FT_Int        num_segments;
      AF_Segment    segments;
  
      FT_Int        num_edges;
      AF_Edge       edges;
  
      AF_Direction  major_dir;
  
    } AF_AxisHintsRec, *AF_AxisHints;
  
  
    typedef struct AF_GlyphHintsRec_
    {
      FT_Memory     memory;
  
      FT_Fixed      x_scale;
      FT_Pos        x_delta;
  
      FT_Fixed      y_scale;
      FT_Pos        y_delta;
  
      FT_Pos        edge_distance_threshold;
  
      FT_Int        max_points;
      FT_Int        num_points;
      AF_Point      points;
  
      FT_Int        max_contours;
      FT_Int        num_contours;
      AF_Point*     contours;
  
      AF_AxisHintsRec  axis[ AF_DIMENSION_MAX ];
      
      FT_UInt32         scaler_flags;  /* copy of scaler flags */
      FT_UInt32         other_flags;   /* free for script-specific implementations */
      AF_ScriptMetrics  metrics;
  
    } AF_GlyphHintsRec;
  
  
  #define  AF_HINTS_TEST_SCALER(h,f)  ( (h)->scaler_flags & (f) )
  #define  AF_HINTS_TEST_OTHER(h,f)   ( (h)->other_flags  & (f) )
  
  #define  AF_HINTS_DO_HORIZONTAL(h)  \
              !AF_HINTS_TEST_SCALER(h,AF_SCALER_FLAG_NO_HORIZONTAL)
  
  #define  AF_HINTS_DO_VERTICAL(h)    \
              !AF_HINTS_TEST_SCALER(h,AF_SCALER_FLAG_NO_VERTICAL)
  
  #define  AF_HINTS_DO_ADVANCE(h)     \
              !AF_HINTS_TEST_SCALER(h,AF_SCALER_FLAG_NO_ADVANCE)
  
  
    FT_LOCAL( AF_Direction )
    af_direction_compute( FT_Pos  dx,
                          FT_Pos  dy );
  
  
    FT_LOCAL( void )
    af_glyph_hints_init( AF_GlyphHints  hints,
                         FT_Memory      memory );
  
  
  
   /*  recomputes all AF_Point in a AF_GlyphHints from the definitions
    *  in a source outline
    */
    FT_LOCAL( void )
    af_glyph_hints_rescale( AF_GlyphHints     hints,
                            AF_ScriptMetrics  metrics );
  
    FT_LOCAL( FT_Error )
    af_glyph_hints_reload( AF_GlyphHints     hints,
                           FT_Outline*       outline );
  
    FT_LOCAL( void )
    af_glyph_hints_save( AF_GlyphHints   hints,
                         FT_Outline*     outline );
  
    FT_LOCAL( void )
    af_glyph_hints_align_edge_points( AF_GlyphHints  hints,
                                      AF_Dimension   dim );
  
    FT_LOCAL( void )
    af_glyph_hints_align_strong_points( AF_GlyphHints  hints,
                                        AF_Dimension   dim );
  
    FT_LOCAL( void )
    af_glyph_hints_align_weak_points( AF_GlyphHints  hints,
                                      AF_Dimension   dim );
  
    FT_LOCAL( void )
    af_glyph_hints_done( AF_GlyphHints  hints );
  
  /* */
  
  FT_END_HEADER
  
  #endif /* __AFHINTS_H__ */
  

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