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

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• Hash : dfa46199
  Author :
  Date : 2004-03-05T09:26:24
  

  * Jamfile, vms_make.com, builds/win32/visualc/freetype.dsp, builds/win32/visualc/freetype/vcproj, include/freetype/ftmoderr.h: Add LZW module. * Jamfile.in: Removed. * docs/CHANGES: Updated. * include/freetype/internal/ftobjs.h: s/MIN/FT_MIN/, s/MAX/FT_MAX/, s/ABS/FT_ABS/. Updated all callers. * src/type1/t1load.c (parse_dict), src/pcf/pcfdrivr.c (PCF_Face_Init): Use FT_ERROR_BASE. Add support for PCF fonts compressed with LZW (extension .pcf.Z, created with `compress'). * include/freetype/config/ftoption.h, devel/ftoption.h (FT_CONFIG_OPTION_USE_LZW): New macro. * include/freetype/ftlzw.h: New file. * include/freetype/config/ftheader.h (FT_LZW_H): New macro for ftlzw.h. * src/lzw/*: New files. * src/pcf/pcfdrivr.c: Include FT_LZW_H. (PCF_Face_Init): Try LZW also. * src/gzip/ftgzip.c: s/0/Gzip_Err_Ok/ where appropriate. Beautify.

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• src/autofit/aflatin.c

• #include "aflatin.h"
  
   /***************************************************************************/
   /***************************************************************************/
   /*****                                                                 *****/
   /*****       L A T I N   G L O B A L   M E T R I C S                   *****/
   /*****                                                                 *****/
   /***************************************************************************/
   /***************************************************************************/
  
    static void
    af_latin_metrics_init_widths( AF_LatinMetrics  metrics,
                                  FT_Face          face )
    {
      /* scan the array of segments in each direction */
      AF_GlyphHintsRec  hints[1];
  
      af_glyph_hints_init( hints, face->memory );
  
      metrics->axis[ AF_DIMENSION_HORZ ].width_count = 0;
      metrics->axis[ AF_DIMENSION_VERT ].width_count = 0;
  
      /* For now, compute the standard width and height from the `o' */
      {
        FT_Error      error;
        FT_UInt       glyph_index;
        AF_Dimension  dim;
        AF_ScalerRec  scaler[1];
  
  
        glyph_index = FT_Get_Char_Index( face, 'o' );
        if ( glyph_index == 0 )
          goto Exit;
  
        error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
        if ( error || face->glyph->outline.n_points <= 0 )
          goto Exit;
  
        scaler->x_scale     = scaler->y_scale = 0x10000L;
        scaler->x_delta     = scaler->y_delta = 0;
        scaler->face        = face;
        scaler->render_mode = 0;
        scaler->flags       = 0;
  
        error = af_glyph_hints_reset( hints, scaler,
                                      (AF_ScriptMetrics) metrics,
                                      &face->glyph->outline );
        if ( error )
          goto Exit;
  
        for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
        {
          AF_LatinAxis  axis    = & metrics->axis[ dim ];
          AF_AxisHints  axhints = & hints->axis[ dim ];
          AF_Segment    seg, limit, link;
          FT_UInt       num_widths = 0;
          FT_Pos        edge_distance_threshold = 32000;
  
          af_latin_hints_compute_segments( hints, dim );
          af_latin_hints_link_segments   ( hints, dim );
  
          seg   = axhints->segments;
          limit = seg + axhints->num_segments;
  
          for ( ; seg < limit; seg++ )
          {
            link = seg->link;
            /* we only consider stem segments there! */
            if ( link && link->link == seg && link > seg )
            {
              FT_Pos  dist;
  
  
              dist = seg->pos - link->pos;
              if ( dist < 0 )
                dist = -dist;
  
              if ( num_widths < AF_LATIN_MAX_WIDTHS )
                axis->widths[ num_widths++ ].org = dist;
            }
          }
  
          af_sort_widths( num_widths, axis->widths );
          axis->width_count = num_widths;
  
          /* we will now try to find the smallest width */
          if ( num_widths > 0 && axis->widths[0].org < edge_distance_threshold )
            edge_distance_threshold = axis->widths[0].org;
  
          /* Now, compute the edge distance threshold as a fraction of the */
          /* smallest width in the font. Set it in `hinter->glyph' too!    */
          if ( edge_distance_threshold == 32000 )
            edge_distance_threshold = 50;
  
          /* let's try 20% */
          axis->edge_distance_threshold = edge_distance_threshold / 5;
        }
      }
  
    Exit:
      af_glyph_hints_done( hints );
    }
  
  
  
  #define AF_LATIN_MAX_TEST_CHARACTERS  12
  
  
    static  const char* const  af_latin_blue_chars[ AF_LATIN_MAX_BLUES ] =
    {
      "THEZOCQS",
      "HEZLOCUS",
      "fijkdbh",
      "xzroesc",
      "xzroesc",
      "pqgjy"
    };
  
  
    static void
    af_latin_metrics_init_blues( AF_LatinMetrics  metrics,
                                 FT_Face          face )
    {
      FT_Pos        flats [ AF_LATIN_MAX_TEST_CHARACTERS ];
      FT_Pos        rounds[ AF_LATIN_MAX_TEST_CHARACTERS ];
      FT_Int        num_flats;
      FT_Int        num_rounds;
      FT_Int        bb;
      AF_LatinBlue  blue;
      FT_Error      error;
      AF_LatinAxis  axis  = &metrics->axis[ AF_DIMENSION_VERT ];
      FT_GlyphSlot  glyph = face->glyph;
  
      /* we compute the blues simply by loading each character from the    */
      /* 'af_latin_blue_chars[blues]' string, then compute its top-most or */
      /* bottom-most points (depending on `AF_IS_TOP_BLUE')                */
  
      AF_LOG(( "blue zones computation\n" ));
      AF_LOG(( "------------------------------------------------\n" ));
  
      for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
      {
        const char*  p     = af_latin_blue_chars[bb];
        const char*  limit = p + AF_LATIN_MAX_TEST_CHARACTERS;
        FT_Pos*      blue_ref;
        FT_Pos*      blue_shoot;
  
        AF_LOG(( "blue %3d: ", bb ));
  
        num_flats  = 0;
        num_rounds = 0;
  
        for ( ; p < limit && *p; p++ )
        {
          FT_UInt     glyph_index;
          FT_Vector*  extremum;
          FT_Vector*  points;
          FT_Vector*  point_limit;
          FT_Vector*  point;
          FT_Bool     round;
  
  
          AF_LOG(( "'%c'", *p ));
  
          /* load the character in the face -- skip unknown or empty ones */
          glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p );
          if ( glyph_index == 0 )
            continue;
  
          error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
          if ( error || glyph->outline.n_points <= 0 )
            continue;
  
          /* now compute min or max point indices and coordinates */
          points      = glyph->outline.points;
          point_limit = points + glyph->outline.n_points;
          point       = points;
          extremum    = point;
          point++;
  
          if ( AF_LATIN_IS_TOP_BLUE( bb ) )
          {
            for ( ; point < point_limit; point++ )
              if ( point->y > extremum->y )
                extremum = point;
          }
          else
          {
            for ( ; point < point_limit; point++ )
              if ( point->y < extremum->y )
                extremum = point;
          }
  
          AF_LOG(( "%5d", (int)extremum->y ));
  
          /* now, check whether the point belongs to a straight or round  */
          /* segment; we first need to find in which contour the extremum */
          /* lies, then see its previous and next points                  */
          {
            FT_Int  idx = (FT_Int)( extremum - points );
            FT_Int  n;
            FT_Int  first, last, prev, next, end;
            FT_Pos  dist;
  
  
            last  = -1;
            first = 0;
  
            for ( n = 0; n < glyph->outline.n_contours; n++ )
            {
              end = glyph->outline.contours[n];
              if ( end >= idx )
              {
                last = end;
                break;
              }
              first = end + 1;
            }
  
            /* XXX: should never happen! */
            if ( last < 0 )
              continue;
  
            /* now look for the previous and next points that are not on the */
            /* same Y coordinate.  Threshold the `closeness'...              */
  
            prev = idx;
            next = prev;
  
            do
            {
              if ( prev > first )
                prev--;
              else
                prev = last;
  
              dist = points[prev].y - extremum->y;
              if ( dist < -5 || dist > 5 )
                break;
  
            } while ( prev != idx );
  
            do
            {
              if ( next < last )
                next++;
              else
                next = first;
  
              dist = points[next].y - extremum->y;
              if ( dist < -5 || dist > 5 )
                break;
  
            } while ( next != idx );
  
            /* now, set the `round' flag depending on the segment's kind */
            round = FT_BOOL(
              FT_CURVE_TAG( glyph->outline.tags[prev] ) != FT_CURVE_TAG_ON ||
              FT_CURVE_TAG( glyph->outline.tags[next] ) != FT_CURVE_TAG_ON );
  
            AF_LOG(( "%c ", round ? 'r' : 'f' ));
          }
  
          if ( round )
            rounds[num_rounds++] = extremum->y;
          else
            flats[num_flats++] = extremum->y;
        }
  
        AF_LOG(( "\n" ));
  
        if ( num_flats == 0 && num_rounds == 0 )
        {
         /* we couldn't find a single glyph to compute this blue zone,
          * we will simply ignore it then
          */
          AF_LOG(( "empty !!\n" ));
          continue;
        }
  
        /* we have computed the contents of the `rounds' and `flats' tables, */
        /* now determine the reference and overshoot position of the blue -- */
        /* we simply take the median value after a simple sort               */
        af_sort_pos( num_rounds, rounds );
        af_sort_pos( num_flats,  flats );
  
        blue       = & axis->blues[ axis->blue_count ];
        blue_ref   = & blue->ref.org;
        blue_shoot = & blue->shoot.org;
  
        axis->blue_count ++;
  
        if ( num_flats == 0 )
        {
          *blue_ref    =
          *blue_shoot = rounds[num_rounds / 2];
        }
        else if ( num_rounds == 0 )
        {
          *blue_ref   =
          *blue_shoot = flats[num_flats / 2];
        }
        else
        {
          *blue_ref   = flats[num_flats / 2];
          *blue_shoot = rounds[num_rounds / 2];
        }
  
        /* there are sometimes problems: if the overshoot position of top     */
        /* zones is under its reference position, or the opposite for bottom  */
        /* zones.  We must thus check everything there and correct the errors */
        if ( *blue_shoot != *blue_ref )
        {
          FT_Pos   ref      = *blue_ref;
          FT_Pos   shoot    = *blue_shoot;
          FT_Bool  over_ref = FT_BOOL( shoot > ref );
  
  
          if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )
            *blue_shoot = *blue_ref = ( shoot + ref ) / 2;
        }
  
        blue->flags = 0;
        if ( AF_LATIN_IS_TOP_BLUE(bb) )
          blue->flags |= AF_LATIN_BLUE_TOP;
  
        AF_LOG(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot ));
      }
  
      return;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    af_latin_metrics_init( AF_LatinMetrics  metrics,
                           FT_Face          face )
    {
      FT_Error      error;
      FT_CharMap    oldmap = face->charmap;
  
      /* do we have a Unicode charmap in there? */
      error = FT_Select_Charmap( face, FT_ENCODING_UNICODE );
      if ( error ) goto Exit;
  
      metrics->units_per_em = face->units_per_EM;
  
      af_latin_metrics_init_widths( metrics, face );
      af_latin_metrics_init_blues( metrics, face );
  
    Exit:
      FT_Set_Charmap( face, oldmap );
      return error;
    }
  
  
    static void
    af_latin_metrics_scale_dim( AF_LatinMetrics   metrics,
                                AF_Scaler         scaler,
                                AF_Dimension      dim )
    {
      FT_Fixed      scale;
      FT_Pos        delta;
      AF_LatinAxis  axis;
      FT_UInt       nn;
  
      if ( dim == AF_DIMENSION_HORZ )
      {
        scale = scaler->x_scale;
        delta = scaler->x_delta;
      }
      else
      {
        scale = scaler->y_scale;
        delta = scaler->y_delta;
      }
  
      axis = & metrics->axis[ dim ];
  
      if ( axis->org_scale == scale && axis->org_delta == delta )
        return;
  
      axis->org_scale = scale;
      axis->org_delta = delta;
  
     /* XXX: TODO: Correct Y and X scale according to Chester rules
      */
      axis->scale = scale;
      axis->delta = delta;
  
      if ( dim == AF_DIMENSION_HORZ )
      {
        metrics->root.scaler.x_scale = scale;
        metrics->root.scaler.x_delta = delta;
      }
      else
      {
        metrics->root.scaler.y_scale = scale;
        metrics->root.scaler.y_delta = delta;
      }
  
     /* scale the standard widths
      */
      for ( nn = 0; nn < axis->width_count; nn++ )
      {
        AF_Width  width = axis->widths + nn;
  
        width->cur = FT_MulFix( width->org, scale );
        width->fit = width->cur;
      }
  
      if ( dim == AF_DIMENSION_VERT )
      {
       /* scale the blue zones
        */
        for ( nn = 0; nn < axis->blue_count; nn++ )
        {
          AF_LatinBlue  blue  = & axis->blues[nn];
          FT_Pos        dist;
  
          blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
          blue->ref.fit = blue->ref.cur;
  
          blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
          blue->shoot.fit = blue->shoot.cur;
  
         /* a blue zone is only active when it is less than 3/4 pixels tall
          */
          dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
          if ( dist >= 48 || dist <= -48 )
            blue->flags |= ~AF_LATIN_BLUE_ACTIVE;
        }
      }
    }
  
  
    FT_LOCAL_DEF( void )
    af_latin_metrics_scale( AF_LatinMetrics  metrics,
                            AF_Scaler        scaler )
    {
      af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
      af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
    }
  
  
   /***************************************************************************/
   /***************************************************************************/
   /*****                                                                 *****/
   /*****            L A T I N   G L Y P H   A N A L Y S I S              *****/
   /*****                                                                 *****/
   /***************************************************************************/
   /***************************************************************************/
  
    FT_LOCAL_DEF( void )
    af_latin_hints_compute_segments( AF_GlyphHints  hints,
                                     AF_Dimension   dim )
    {
      AF_AxisHints  axis = &hints->axis[dim];
      AF_Segment    segments = axis->segments;
      AF_Segment    segment       =  segments;
      FT_Int        num_segments  =  0;
      AF_Point*     contour       =  hints->contours;
      AF_Point*     contour_limit =  contour + hints->num_contours;
      AF_Direction  major_dir, segment_dir;
  
  #ifdef AF_HINT_METRICS
      AF_Point    min_point     =  0;
      AF_Point    max_point     =  0;
      FT_Pos      min_coord     =  32000;
      FT_Pos      max_coord     = -32000;
  #endif
  
      major_dir   = FT_ABS( axis->major_dir );
      segment_dir = major_dir;
  
      /* set up (u,v) in each point */
      if ( dim == AF_DIMENSION_HORZ )
      {
        AF_Point  point = hints->points;
        AF_Point  limit = point + hints->num_points;
  
        for ( ; point < limit; point++ )
        {
          point->u = point->fx;
          point->v = point->fy;
        }
      }
      else
      {
        AF_Point  point = hints->points;
        AF_Point  limit = point + hints->num_points;
  
        for ( ; point < limit; point++ )
        {
          point->u = point->fy;
          point->v = point->fx;
        }
      }
  
  
      /* do each contour separately */
      for ( ; contour < contour_limit; contour++ )
      {
        AF_Point  point   =  contour[0];
        AF_Point  last    =  point->prev;
        int       on_edge =  0;
        FT_Pos    min_pos =  32000;  /* minimum segment pos != min_coord */
        FT_Pos    max_pos = -32000;  /* maximum segment pos != max_coord */
        FT_Bool   passed;
  
  
  #ifdef AF_HINT_METRICS
        if ( point->u < min_coord )
        {
          min_coord = point->u;
          min_point = point;
        }
        if ( point->u > max_coord )
        {
          max_coord = point->u;
          max_point = point;
        }
  #endif
  
        if ( point == last )  /* skip singletons -- just in case */
          continue;
  
        if ( FT_ABS( last->out_dir )  == major_dir &&
             FT_ABS( point->out_dir ) == major_dir )
        {
          /* we are already on an edge, try to locate its start */
          last = point;
  
          for (;;)
          {
            point = point->prev;
            if ( FT_ABS( point->out_dir ) != major_dir )
            {
              point = point->next;
              break;
            }
            if ( point == last )
              break;
          }
        }
  
        last   = point;
        passed = 0;
  
        for (;;)
        {
          FT_Pos  u, v;
  
  
          if ( on_edge )
          {
            u = point->u;
            if ( u < min_pos )
              min_pos = u;
            if ( u > max_pos )
              max_pos = u;
  
            if ( point->out_dir != segment_dir || point == last )
            {
              /* we are just leaving an edge; record a new segment! */
              segment->last = point;
              segment->pos  = ( min_pos + max_pos ) >> 1;
  
              /* a segment is round if either its first or last point */
              /* is a control point                                   */
              if ( ( segment->first->flags | point->flags ) &
                     AF_FLAG_CONTROL                        )
                segment->flags |= AF_EDGE_ROUND;
  
              /* compute segment size */
              min_pos = max_pos = point->v;
  
              v = segment->first->v;
              if ( v < min_pos )
                min_pos = v;
              if ( v > max_pos )
                max_pos = v;
  
              segment->min_coord = min_pos;
              segment->max_coord = max_pos;
  
              on_edge = 0;
              num_segments++;
              segment++;
              /* fallthrough */
            }
          }
  
          /* now exit if we are at the start/end point */
          if ( point == last )
          {
            if ( passed )
              break;
            passed = 1;
          }
  
          if ( !on_edge && FT_ABS( point->out_dir ) == major_dir )
          {
            /* this is the start of a new segment! */
            segment_dir = point->out_dir;
  
            /* clear all segment fields */
            FT_ZERO( segment );
  
            segment->dir      = segment_dir;
            segment->flags    = AF_EDGE_NORMAL;
            min_pos = max_pos = point->u;
            segment->first    = point;
            segment->last     = point;
            segment->contour  = contour;
            segment->score    = 32000;
            segment->link     = NULL;
            on_edge           = 1;
  
  #ifdef AF_HINT_METRICS
            if ( point == max_point )
              max_point = 0;
  
            if ( point == min_point )
              min_point = 0;
  #endif
          }
  
          point = point->next;
        }
  
      } /* contours */
  
  #ifdef AF_HINT_METRICS
      /* we need to ensure that there are edges on the left-most and  */
      /* right-most points of the glyph in order to hint the metrics; */
      /* we do this by inserting fake segments when needed            */
      if ( dim == AF_DIMENSION_HORZ )
      {
        AF_Point  point       = hints->points;
        AF_Point  point_limit = point + hints->num_points;
  
        FT_Pos    min_pos =  32000;
        FT_Pos    max_pos = -32000;
  
  
        min_point = 0;
        max_point = 0;
  
        /* compute minimum and maximum points */
        for ( ; point < point_limit; point++ )
        {
          FT_Pos  x = point->fx;
  
  
          if ( x < min_pos )
          {
            min_pos   = x;
            min_point = point;
          }
          if ( x > max_pos )
          {
            max_pos   = x;
            max_point = point;
          }
        }
  
        /* insert minimum segment */
        if ( min_point )
        {
          /* clear all segment fields */
          FT_ZERO( segment );
  
          segment->dir   = segment_dir;
          segment->flags = AF_EDGE_NORMAL;
          segment->first = min_point;
          segment->last  = min_point;
          segment->pos   = min_pos;
          segment->score = 32000;
          segment->link  = NULL;
  
          num_segments++;
          segment++;
        }
  
        /* insert maximum segment */
        if ( max_point )
        {
          /* clear all segment fields */
          FT_ZERO( segment );
  
          segment->dir   = segment_dir;
          segment->flags = AF_EDGE_NORMAL;
          segment->first = max_point;
          segment->last  = max_point;
          segment->pos   = max_pos;
          segment->score = 32000;
          segment->link  = NULL;
  
          num_segments++;
          segment++;
        }
      }
  #endif /* AF_HINT_METRICS */
  
      axis->num_segments = num_segments;
    }
  
  
    FT_LOCAL_DEF( void )
    af_latin_hints_link_segments( AF_GlyphHints  hints,
                                  AF_Dimension   dim )
    {
      AF_AxisHints  axis          = &hints->axis[dim];
      AF_Segment    segments      = axis->segments;
      AF_Segment    segment_limit = segments + axis->num_segments;
      AF_Direction  major_dir     = axis->major_dir;
      AF_Segment    seg1, seg2;
  
      /* now compare each segment to the others */
      for ( seg1 = segments; seg1 < segment_limit; seg1++ )
      {
        /* the fake segments are introduced to hint the metrics -- */
        /* we must never link them to anything                     */
        if ( seg1->first == seg1->last || seg1->dir != major_dir )
          continue;
  
        for ( seg2 = segments; seg2 < segment_limit; seg2++ )
          if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
          {
            FT_Pos  pos1 = seg1->pos;
            FT_Pos  pos2 = seg2->pos;
            FT_Pos  dist = pos2 - pos1;
  
  
            if ( dist < 0 )
              continue;
  
            {
              FT_Pos  min = seg1->min_coord;
              FT_Pos  max = seg1->max_coord;
              FT_Pos  len, score;
  
  
              if ( min < seg2->min_coord )
                min = seg2->min_coord;
  
              if ( max > seg2->max_coord )
                max = seg2->max_coord;
  
              len = max - min;
              if ( len >= 8 )
              {
                score = dist + 3000 / len;
  
                if ( score < seg1->score )
                {
                  seg1->score = score;
                  seg1->link  = seg2;
                }
  
                if ( score < seg2->score )
                {
                  seg2->score = score;
                  seg2->link  = seg1;
                }
              }
            }
          }
      }
  
      /* now, compute the `serif' segments */
      for ( seg1 = segments; seg1 < segment_limit; seg1++ )
      {
        seg2 = seg1->link;
  
        if ( seg2 )
        {
          seg2->num_linked++;
          if ( seg2->link != seg1 )
          {
            seg1->link  = 0;
            seg1->serif = seg2->link;
          }
        }
      }
    }
  
  
    FT_LOCAL_DEF( void )
    af_latin_hints_compute_edges( AF_GlyphHints  hints,
                                  AF_Dimension   dim )
    {
      AF_AxisHints  axis = &hints->axis[dim];
      AF_Edge       edges = axis->edges;
      AF_Edge       edge, edge_limit;
  
      AF_Segment    segments = axis->segments;
      AF_Segment    segment_limit = segments + axis->num_segments;
      AF_Segment    seg;
  
      AF_Direction  up_dir;
      FT_Fixed      scale;
      FT_Pos        edge_distance_threshold;
  
  
      scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
                                           : hints->y_scale;
  
      up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
                                            : AF_DIR_RIGHT;
  
      /*********************************************************************/
      /*                                                                   */
      /* We will begin by generating a sorted table of edges for the       */
      /* current direction.  To do so, we simply scan each segment and try */
      /* to find an edge in our table that corresponds to its position.    */
      /*                                                                   */
      /* If no edge is found, we create and insert a new edge in the       */
      /* sorted table.  Otherwise, we simply add the segment to the edge's */
      /* list which will be processed in the second step to compute the    */
      /* edge's properties.                                                */
      /*                                                                   */
      /* Note that the edges table is sorted along the segment/edge        */
      /* position.                                                         */
      /*                                                                   */
      /*********************************************************************/
  
      edge_distance_threshold = FT_MulFix( hints->edge_distance_threshold,
                                           scale );
      if ( edge_distance_threshold > 64 / 4 )
        edge_distance_threshold = 64 / 4;
  
      edge_distance_threshold = FT_DivFix( edge_distance_threshold,
                                           scale );
  
      edge_limit = edges;
      for ( seg = segments; seg < segment_limit; seg++ )
      {
        AF_Edge  found = 0;
  
  
        /* look for an edge corresponding to the segment */
        for ( edge = edges; edge < edge_limit; edge++ )
        {
          FT_Pos  dist;
  
  
          dist = seg->pos - edge->fpos;
          if ( dist < 0 )
            dist = -dist;
  
          if ( dist < edge_distance_threshold )
          {
            found = edge;
            break;
          }
        }
  
        if ( !found )
        {
          /* insert a new edge in the list and */
          /* sort according to the position    */
          while ( edge > edges && edge[-1].fpos > seg->pos )
          {
            edge[0] = edge[-1];
            edge--;
          }
          edge_limit++;
  
          /* clear all edge fields */
          FT_ZERO( edge );
  
          /* add the segment to the new edge's list */
          edge->first    = seg;
          edge->last     = seg;
          edge->fpos     = seg->pos;
          edge->opos     = edge->pos = FT_MulFix( seg->pos, scale );
          seg->edge_next = seg;
        }
        else
        {
          /* if an edge was found, simply add the segment to the edge's */
          /* list                                                       */
          seg->edge_next        = edge->first;
          edge->last->edge_next = seg;
          edge->last            = seg;
        }
      }
      axis->num_edges = (FT_Int)( edge_limit - edges );
  
  
      /*********************************************************************/
      /*                                                                   */
      /* Good, we will now compute each edge's properties according to     */
      /* segments found on its position.  Basically, these are:            */
      /*                                                                   */
      /*  - edge's main direction                                          */
      /*  - stem edge, serif edge or both (which defaults to stem then)    */
      /*  - rounded edge, straight or both (which defaults to straight)    */
      /*  - link for edge                                                  */
      /*                                                                   */
      /*********************************************************************/
  
      /* first of all, set the `edge' field in each segment -- this is */
      /* required in order to compute edge links                       */
  
      /* Note that I've tried to remove this loop, setting
       * the "edge" field of each segment directly in the
       * code above.  For some reason, it slows down execution
       * speed -- on a Sun.
       */
      for ( edge = edges; edge < edge_limit; edge++ )
      {
        seg = edge->first;
        if ( seg )
          do
          {
            seg->edge = edge;
            seg       = seg->edge_next;
          }
          while ( seg != edge->first );
      }
  
      /* now, compute each edge properties */
      for ( edge = edges; edge < edge_limit; edge++ )
      {
        FT_Int  is_round    = 0;  /* does it contain round segments?    */
        FT_Int  is_straight = 0;  /* does it contain straight segments? */
        FT_Pos  ups         = 0;  /* number of upwards segments         */
        FT_Pos  downs       = 0;  /* number of downwards segments       */
  
  
        seg = edge->first;
  
        do
        {
          FT_Bool  is_serif;
  
  
          /* check for roundness of segment */
          if ( seg->flags & AF_EDGE_ROUND )
            is_round++;
          else
            is_straight++;
  
          /* check for segment direction */
          if ( seg->dir == up_dir )
            ups   += seg->max_coord-seg->min_coord;
          else
            downs += seg->max_coord-seg->min_coord;
  
          /* check for links -- if seg->serif is set, then seg->link must */
          /* be ignored                                                   */
          is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge );
  
          if ( seg->link || is_serif )
          {
            AF_Edge     edge2;
            AF_Segment  seg2;
  
  
            edge2 = edge->link;
            seg2  = seg->link;
  
            if ( is_serif )
            {
              seg2  = seg->serif;
              edge2 = edge->serif;
            }
  
            if ( edge2 )
            {
              FT_Pos  edge_delta;
              FT_Pos  seg_delta;
  
  
              edge_delta = edge->fpos - edge2->fpos;
              if ( edge_delta < 0 )
                edge_delta = -edge_delta;
  
              seg_delta = seg->pos - seg2->pos;
              if ( seg_delta < 0 )
                seg_delta = -seg_delta;
  
              if ( seg_delta < edge_delta )
                edge2 = seg2->edge;
            }
            else
              edge2 = seg2->edge;
  
            if ( is_serif )
            {
              edge->serif   = edge2;
              edge2->flags |= AF_EDGE_SERIF;
            }
            else
              edge->link  = edge2;
          }
  
          seg = seg->edge_next;
  
        } while ( seg != edge->first );
  
        /* set the round/straight flags */
        edge->flags = AF_EDGE_NORMAL;
  
        if ( is_round > 0 && is_round >= is_straight )
          edge->flags |= AF_EDGE_ROUND;
  
        /* set the edge's main direction */
        edge->dir = AF_DIR_NONE;
  
        if ( ups > downs )
          edge->dir = up_dir;
  
        else if ( ups < downs )
          edge->dir = -up_dir;
  
        else if ( ups == downs )
          edge->dir = 0;  /* both up and down! */
  
        /* gets rid of serifs if link is set                */
        /* XXX: This gets rid of many unpleasant artefacts! */
        /*      Example: the `c' in cour.pfa at size 13     */
  
        if ( edge->serif && edge->link )
          edge->serif = 0;
      }
    }
  
  
    FT_LOCAL_DEF( void )
    af_latin_hints_detect_features( AF_GlyphHints  hints,
                                    AF_Dimension   dim )
    {
      af_latin_hints_compute_segments( hints, dim );
      af_latin_hints_link_segments   ( hints, dim );
      af_latin_hints_compute_edges   ( hints, dim );
    }
  
  
    FT_LOCAL_DEF( void )
    af_latin_hints_compute_blue_edges( AF_GlyphHints    hints,
                                       AF_LatinMetrics  metrics )
    {
      AF_AxisHints  axis       = &hints->axis[ AF_DIMENSION_VERT ];
      AF_Edge       edge       = axis->edges;
      AF_Edge       edge_limit = edge + axis->num_edges;
      AF_LatinAxis  latin      = &metrics->axis[ AF_DIMENSION_VERT ];
      FT_Fixed      scale      = latin->scale;
  
  
      /* compute which blue zones are active, i.e. have their scaled */
      /* size < 3/4 pixels                                           */
  
     /* for each horizontal edge search the blue zone which is closest */
      for ( ; edge < edge_limit; edge++ )
      {
        FT_Int     bb;
        AF_Width   best_blue = NULL;
        FT_Pos     best_dist;  /* initial threshold */
  
  
        /* compute the initial threshold as a fraction of the EM size */
        best_dist = FT_MulFix( metrics->units_per_em / 40, scale );
  
        if ( best_dist > 64 / 2 )
          best_dist = 64 / 2;
  
        for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
        {
          AF_LatinBlue  blue = latin->blues + bb;
          FT_Bool       is_top_blue, is_major_dir;
  
         /* skip inactive blue zones (i.e. those that are too small
          */
          if ( !(blue->flags & AF_LATIN_BLUE_ACTIVE) )
            continue;
  
          /* if it is a top zone, check for right edges -- if it is a bottom */
          /* zone, check for left edges                                      */
          /*                                                                 */
          /* of course, that's for TrueType                                  */
          is_top_blue  = (blue->flags & AF_LATIN_BLUE_TOP) != 0;
          is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
  
          /* if it is a top zone, the edge must be against the major    */
          /* direction; if it is a bottom zone, it must be in the major */
          /* direction                                                  */
          if ( is_top_blue ^ is_major_dir )
          {
            FT_Pos   dist;
  
  
            /* first of all, compare it to the reference position */
            dist = edge->fpos - blue->ref.org;
            if ( dist < 0 )
              dist = -dist;
  
            dist = FT_MulFix( dist, scale );
            if ( dist < best_dist )
            {
              best_dist = dist;
              best_blue = & blue->ref;
            }
  
            /* now, compare it to the overshoot position if the edge is     */
            /* rounded, and if the edge is over the reference position of a */
            /* top zone, or under the reference position of a bottom zone   */
            if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
            {
              FT_Bool  is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );
  
  
              if ( is_top_blue ^ is_under_ref )
              {
                blue = latin->blues + bb;
                dist = edge->fpos - blue->shoot.org;
                if ( dist < 0 )
                  dist = -dist;
  
                dist = FT_MulFix( dist, scale );
                if ( dist < best_dist )
                {
                  best_dist = dist;
                  best_blue = & blue->shoot;
                }
              }
            }
          }
        }
  
        if ( best_blue )
          edge->blue_edge = best_blue;
      }
    }
  
  
    static FT_Error
    af_latin_hints_init( AF_GlyphHints    hints,
                         FT_Outline*      outline,
                         AF_LatinMetrics  metrics )
    {
      FT_Error        error;
      FT_Render_Mode  mode;
  
      error = af_glyph_hints_reset( hints, &metrics->root.scaler,
                                    (AF_ScriptMetrics) metrics,
                                    outline );
      if (error)
        goto Exit;
  
  
     /* compute flags depending on render mode, etc...
      */
  
      mode = metrics->root.scaler.render_mode;
  
     /* we snap the width of vertical stems for the monochrome and
      * horizontal LCD rendering targets only.
      */
      if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
        hints->other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
  
     /* we snap the width of horizontal stems for the monochrome and
      * vertical LCD rendering targets only.
      */
      if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
        hints->other_flags |= AF_LATIN_HINTS_VERT_SNAP;
  
     /* XXX
      */
      if ( mode != FT_RENDER_MODE_LIGHT )
        hints->other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
  
      if ( mode == FT_RENDER_MODE_MONO )
        hints->other_flags |= AF_LATIN_HINTS_MONO;
  
     /* analyze glyph outline
      */
      if ( AF_HINTS_DO_HORIZONTAL(hints) )
        af_latin_hints_detect_features( hints, AF_DIMENSION_HORZ );
  
      if ( AF_HINTS_DO_VERTICAL(hints) )
      {
        af_latin_hints_detect_features( hints, AF_DIMENSION_VERT );
        af_latin_hints_compute_blue_edges( hints, metrics );
      }
  
   Exit:
     return error;
    }
  
   /***************************************************************************/
   /***************************************************************************/
   /*****                                                                 *****/
   /*****         L A T I N   G L Y P H   G R I D - F I T T I N G         *****/
   /*****                                                                 *****/
   /***************************************************************************/
   /***************************************************************************/
  
    /* snap a given width in scaled coordinates to one of the */
    /* current standard widths                                */
    static FT_Pos
    af_latin_snap_width( AF_Width  widths,
                         FT_Int    count,
                         FT_Pos    width )
    {
      int     n;
      FT_Pos  best      = 64 + 32 + 2;
      FT_Pos  reference = width;
      FT_Pos  scaled;
  
  
      for ( n = 0; n < count; n++ )
      {
        FT_Pos  w;
        FT_Pos  dist;
  
  
        w = widths[n].cur;
        dist = width - w;
        if ( dist < 0 )
          dist = -dist;
        if ( dist < best )
        {
          best      = dist;
          reference = w;
        }
      }
  
      scaled = FT_PIX_ROUND( reference );
  
      if ( width >= reference )
      {
        if ( width < scaled + 48 )
          width = reference;
      }
      else
      {
        if ( width > scaled - 48 )
          width = reference;
      }
  
      return width;
    }
  
  
    /* compute the snapped width of a given stem */
  
    static FT_Pos
    af_latin_compute_stem_width( AF_GlyphHints  hints,
                                 AF_Dimension   dim,
                                 FT_Pos         width,
                                 AF_Edge_Flags  base_flags,
                                 AF_Edge_Flags  stem_flags )
    {
      AF_LatinMetrics  metrics  = (AF_LatinMetrics) hints->metrics;
      AF_LatinAxis     axis     = & metrics->axis[ dim ];
      FT_Pos           dist     = width;
      FT_Int           sign     = 0;
      FT_Int           vertical = AF_HINTS_DO_VERTICAL( hints );
  
  
      if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
        return width;
  
      if ( dist < 0 )
      {
        dist = -width;
        sign = 1;
      }
  
      if ( (  vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
           ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
      {
        /* smooth hinting process: very lightly quantize the stem width */
        /*                                                              */
  
        /* leave the widths of serifs alone */
  
        if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )
          goto Done_Width;
  
        else if ( ( base_flags & AF_EDGE_ROUND ) )
        {
          if ( dist < 80 )
            dist = 64;
        }
        else if ( dist < 56 )
          dist = 56;
  
        if ( axis->width_count > 0 )
        {
          FT_Pos  delta;
  
         /* compare to standard width
          */
          if ( axis->width_count > 0 )
          {
            delta = dist - axis->widths[0].cur;
  
            if ( delta < 0 )
              delta = -delta;
  
            if ( delta < 40 )
            {
              dist = axis->widths[ 0 ].cur;
              if ( dist < 48 )
                dist = 48;
  
              goto Done_Width;
            }
          }
  
          if ( dist < 3 * 64 )
          {
            delta  = dist & 63;
            dist  &= -64;
  
            if ( delta < 10 )
              dist += delta;
  
            else if ( delta < 32 )
              dist += 10;
  
            else if ( delta < 54 )
              dist += 54;
  
            else
              dist += delta;
          }
          else
            dist = ( dist + 32 ) & ~63;
        }
      }
      else
      {
        /* strong hinting process: snap the stem width to integer pixels */
        /*                                                               */
        dist = af_latin_snap_width( axis->widths, axis->width_count, dist );
  
        if ( vertical )
        {
          /* in the case of vertical hinting, always round */
          /* the stem heights to integer pixels            */
          if ( dist >= 64 )
            dist = ( dist + 16 ) & ~63;
          else
            dist = 64;
        }
        else
        {
          if ( AF_LATIN_HINTS_DO_MONO( hints ) )
          {
            /* monochrome horizontal hinting: snap widths to integer pixels */
            /* with a different threshold                                   */
            if ( dist < 64 )
              dist = 64;
            else
              dist = ( dist + 32 ) & ~63;
          }
          else
          {
            /* for horizontal anti-aliased hinting, we adopt a more subtle */
            /* approach: we strengthen small stems, round stems whose size */
            /* is between 1 and 2 pixels to an integer, otherwise nothing  */
            if ( dist < 48 )
              dist = ( dist + 64 ) >> 1;
  
            else if ( dist < 128 )
              dist = ( dist + 22 ) & ~63;
            else
              /* round otherwise to prevent color fringes in LCD mode */
              dist = ( dist + 32 ) & ~63;
          }
        }
      }
  
    Done_Width:
      if ( sign )
        dist = -dist;
  
      return dist;
    }
  
  
  
    /* align one stem edge relative to the previous stem edge */
    static void
    af_latin_align_linked_edge( AF_GlyphHints  hints,
                                AF_Dimension   dim,
                                AF_Edge        base_edge,
                                AF_Edge        stem_edge )
    {
      FT_Pos  dist = stem_edge->opos - base_edge->opos;
  
      FT_Pos  fitted_width = af_latin_compute_stem_width( hints,
                                                          dim,
                                                          dist,
                                                          base_edge->flags,
                                                          stem_edge->flags );
  
      stem_edge->pos = base_edge->pos + fitted_width;
    }
  
  
    static void
    af_latin_align_serif_edge( AF_GlyphHints  hints,
                               AF_Edge        base,
                               AF_Edge        serif )
    {
      FT_UNUSED( hints );
  
      serif->pos = base->pos + (serif->opos - base->opos);
    }
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /****                                                                 ****/
    /****       E D G E   H I N T I N G                                   ****/
    /****                                                                 ****/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
    FT_LOCAL_DEF( void )
    af_latin_hint_edges( AF_GlyphHints   hints,
                         AF_Dimension    dim )
    {
      AF_AxisHints  axis = & hints->axis[dim];
      AF_Edge       edges = axis->edges;
      AF_Edge       edge_limit = edges + axis->num_edges;
      FT_Int        n_edges;
      AF_Edge       edge;
      AF_Edge       anchor = 0;
      FT_Int        has_serifs = 0;
  
  
      /* we begin by aligning all stems relative to the blue zone */
      /* if needed -- that's only for horizontal edges            */
      if ( dim == AF_DIMENSION_VERT )
      {
        for ( edge = edges; edge < edge_limit; edge++ )
        {
          AF_Width  blue;
          AF_Edge   edge1, edge2;
  
  
          if ( edge->flags & AF_EDGE_DONE )
            continue;
  
          blue  = edge->blue_edge;
          edge1 = NULL;
          edge2 = edge->link;
  
          if ( blue )
          {
            edge1 = edge;
          }
          else if ( edge2 && edge2->blue_edge )
          {
            blue  = edge2->blue_edge;
            edge1 = edge2;
            edge2 = edge;
          }
  
          if ( !edge1 )
            continue;
  
          edge1->pos    = blue->fit;
          edge1->flags |= AF_EDGE_DONE;
  
          if ( edge2 && !edge2->blue_edge )
          {
            af_latin_align_linked_edge( hints, dim, edge1, edge2 );
            edge2->flags |= AF_EDGE_DONE;
          }
  
          if ( !anchor )
            anchor = edge;
        }
      }
  
      /* now we will align all stem edges, trying to maintain the */
      /* relative order of stems in the glyph                     */
      for ( edge = edges; edge < edge_limit; edge++ )
      {
        AF_Edge  edge2;
  
  
        if ( edge->flags & AF_EDGE_DONE )
          continue;
  
        /* skip all non-stem edges */
        edge2 = edge->link;
        if ( !edge2 )
        {
          has_serifs++;
          continue;
        }
  
        /* now align the stem */
  
        /* this should not happen, but it's better to be safe */
        if ( edge2->blue_edge || edge2 < edge )
        {
          af_latin_align_linked_edge( hints, dim, edge2, edge );
          edge->flags |= AF_EDGE_DONE;
          continue;
        }
  
        if ( !anchor )
        {
          FT_Pos  org_len, org_center, cur_len;
          FT_Pos  cur_pos1, error1, error2, u_off, d_off;
  
  
          org_len = edge2->opos - edge->opos;
          cur_len = af_latin_compute_stem_width( hints, dim, org_len,
                                                 edge->flags, edge2->flags );
          if ( cur_len <= 64 )
            u_off = d_off = 32;
          else
          {
            u_off = 38;
            d_off = 26;
          }
  
          if ( cur_len < 96 )
          {
            org_center = edge->opos + ( org_len >> 1 );
  
            cur_pos1   = FT_PIX_ROUND( org_center );
  
            error1 = org_center - ( cur_pos1 - u_off );
            if ( error1 < 0 )
              error1 = -error1;
  
            error2 = org_center - ( cur_pos1 + d_off );
            if ( error2 < 0 )
              error2 = -error2;
  
            if ( error1 < error2 )
              cur_pos1 -= u_off;
            else
              cur_pos1 += d_off;
  
            edge->pos  = cur_pos1 - cur_len / 2;
            edge2->pos = cur_pos1 + cur_len / 2;
  
          }
          else
            edge->pos = FT_PIX_ROUND( edge->opos );
  
          anchor = edge;
  
          edge->flags |= AF_EDGE_DONE;
  
          af_latin_align_linked_edge( hints, dim, edge, edge2 );
        }
        else
        {
          FT_Pos  org_pos, org_len, org_center, cur_len;
          FT_Pos  cur_pos1, cur_pos2, delta1, delta2;
  
  
          org_pos    = anchor->pos + ( edge->opos - anchor->opos );
          org_len    = edge2->opos - edge->opos;
          org_center = org_pos + ( org_len >> 1 );
  
          cur_len = af_latin_compute_stem_width( hints, dim, org_len,
                                                 edge->flags, edge2->flags  );
  
          if ( cur_len < 96 )
          {
            FT_Pos  u_off, d_off;
  
  
            cur_pos1 = FT_PIX_ROUND( org_center );
  
            if (cur_len <= 64 )
              u_off = d_off = 32;
            else
            {
              u_off = 38;
              d_off = 26;
            }
  
            delta1 = org_center - ( cur_pos1 - u_off );
            if ( delta1 < 0 )
              delta1 = -delta1;
  
            delta2 = org_center - ( cur_pos1 + d_off );
            if ( delta2 < 0 )
              delta2 = -delta2;
  
            if ( delta1 < delta2 )
              cur_pos1 -= u_off;
            else
              cur_pos1 += d_off;
  
            edge->pos  = cur_pos1 - cur_len / 2;
            edge2->pos = cur_pos1 + cur_len / 2;
          }
          else
          {
            org_pos    = anchor->pos + ( edge->opos - anchor->opos );
            org_len    = edge2->opos - edge->opos;
            org_center = org_pos + ( org_len >> 1 );
  
            cur_len    = af_latin_compute_stem_width( hints, dim, org_len,
                                                      edge->flags, edge2->flags );
  
            cur_pos1   = FT_PIX_ROUND( org_pos );
            delta1     = ( cur_pos1 + ( cur_len >> 1 ) - org_center );
            if ( delta1 < 0 )
              delta1 = -delta1;
  
            cur_pos2   = FT_PIX_ROUND( org_pos + org_len ) - cur_len;
            delta2     = ( cur_pos2 + ( cur_len >> 1 ) - org_center );
            if ( delta2 < 0 )
              delta2 = -delta2;
  
            edge->pos  = ( delta1 < delta2 ) ? cur_pos1 : cur_pos2;
            edge2->pos = edge->pos + cur_len;
          }
  
          edge->flags  |= AF_EDGE_DONE;
          edge2->flags |= AF_EDGE_DONE;
  
          if ( edge > edges && edge->pos < edge[-1].pos )
            edge->pos = edge[-1].pos;
        }
      }
  
      /* make sure that lowercase m's maintain their symmetry */
  
      /* In general, lowercase m's have six vertical edges if they are sans */
      /* serif, or twelve if they are avec serif.  This implementation is   */
      /* based on that assumption, and seems to work very well with most    */
      /* faces.  However, if for a certain face this assumption is not      */
      /* true, the m is just rendered like before.  In addition, any stem   */
      /* correction will only be applied to symmetrical glyphs (even if the */
      /* glyph is not an m), so the potential for unwanted distortion is    */
      /* relatively low.                                                    */
  
      /* We don't handle horizontal edges since we can't easily assure that */
      /* the third (lowest) stem aligns with the base line; it might end up */
      /* one pixel higher or lower.                                         */
  
      n_edges = edge_limit - edges;
      if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
      {
        AF_Edge  edge1, edge2, edge3;
        FT_Pos   dist1, dist2, span, delta;
  
  
        if ( n_edges == 6 )
        {
          edge1 = edges;
          edge2 = edges + 2;
          edge3 = edges + 4;
        }
        else
        {
          edge1 = edges + 1;
          edge2 = edges + 5;
          edge3 = edges + 9;
        }
  
        dist1 = edge2->opos - edge1->opos;
        dist2 = edge3->opos - edge2->opos;
  
        span = dist1 - dist2;
        if ( span < 0 )
          span = -span;
  
        if ( span < 8 )
        {
          delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
          edge3->pos -= delta;
          if ( edge3->link )
            edge3->link->pos -= delta;
  
          /* move the serifs along with the stem */
          if ( n_edges == 12 )
          {
            ( edges + 8 )->pos -= delta;
            ( edges + 11 )->pos -= delta;
          }
  
          edge3->flags |= AF_EDGE_DONE;
          if ( edge3->link )
            edge3->link->flags |= AF_EDGE_DONE;
        }
      }
  
      if ( has_serifs || !anchor )
      {
       /* now hint the remaining edges (serifs and single) in order
        * to complete our processing
        */
        for ( edge = edges; edge < edge_limit; edge++ )
        {
          if ( edge->flags & AF_EDGE_DONE )
            continue;
  
          if ( edge->serif )
            af_latin_align_serif_edge( hints, edge->serif, edge );
          else if ( !anchor )
          {
            edge->pos = FT_PIX_ROUND( edge->opos );
            anchor    = edge;
          }
          else
            edge->pos = anchor->pos +
                        FT_PIX_ROUND( edge->opos - anchor->opos );
  
          edge->flags |= AF_EDGE_DONE;
  
          if ( edge > edges && edge->pos < edge[-1].pos )
            edge->pos = edge[-1].pos;
  
          if ( edge + 1 < edge_limit        &&
               edge[1].flags & AF_EDGE_DONE &&
               edge->pos > edge[1].pos      )
            edge->pos = edge[1].pos;
        }
      }
    }
  
  
    static FT_Error
    af_latin_hints_apply( AF_GlyphHints    hints,
                          FT_Outline*      outline,
                          AF_LatinMetrics  metrics )
    {
      AF_Dimension  dim;
  
      FT_UNUSED( metrics );
  
      for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
      {
        if ( (dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL(hints)) ||
             (dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL(hints))   )
        {
          af_latin_hint_edges( hints, dim );
          af_glyph_hints_align_edge_points( hints, dim );
          af_glyph_hints_align_strong_points( hints, dim );
          af_glyph_hints_align_weak_points( hints, dim );
        }
      }
      af_glyph_hints_save( hints, outline );
  
      return 0;
    }
  
   /***************************************************************************/
   /***************************************************************************/
   /*****                                                                 *****/
   /*****      L A T I N   S C R I P T   C L A S S                        *****/
   /*****                                                                 *****/
   /***************************************************************************/
   /***************************************************************************/
  
    static const AF_Script_UniRangeRec  af_latin_uniranges[] =
    {
      { 32, 127 },    /* XXX: TODO: Add new Unicode ranges here !! */
      { 160, 255 },
      { 0, 0 }
    };
  
    FT_LOCAL_DEF( const AF_ScriptClassRec )  af_latin_script_class =
    {
      AF_SCRIPT_LATIN,
      af_latin_uniranges,
  
      sizeof( AF_LatinMetricsRec ),
      (AF_Script_InitMetricsFunc)  af_latin_metrics_init,
      (AF_Script_ScaleMetricsFunc) af_latin_metrics_scale,
      (AF_Script_DoneMetricsFunc)  NULL,
  
      (AF_Script_InitHintsFunc)    af_latin_hints_init,
      (AF_Script_ApplyHintsFunc)   af_latin_hints_apply
    };
  
  

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