afhints.c File Reference

#include "afhints.h"
#include "aferrors.h"

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Macros
#define	FT_COMPONENT   trace_afhints

Functions
	af_axis_hints_new_segment (AF_AxisHints axis, FT_Memory memory, AF_Segment *asegment)
	af_axis_hints_new_edge (AF_AxisHints axis, FT_Int fpos, AF_Direction dir, FT_Bool top_to_bottom_hinting, FT_Memory memory, AF_Edge *anedge)
	af_direction_compute (FT_Pos dx, FT_Pos dy)
	af_glyph_hints_init (AF_GlyphHints hints, FT_Memory memory)
	af_glyph_hints_done (AF_GlyphHints hints)
	af_glyph_hints_rescale (AF_GlyphHints hints, AF_StyleMetrics metrics)
	af_glyph_hints_reload (AF_GlyphHints hints, FT_Outline *outline)
	af_glyph_hints_save (AF_GlyphHints hints, FT_Outline *outline)
	af_glyph_hints_align_edge_points (AF_GlyphHints hints, AF_Dimension dim)
	af_glyph_hints_align_strong_points (AF_GlyphHints hints, AF_Dimension dim)
static void	af_iup_shift (AF_Point p1, AF_Point p2, AF_Point ref)
static void	af_iup_interp (AF_Point p1, AF_Point p2, AF_Point ref1, AF_Point ref2)
	af_glyph_hints_align_weak_points (AF_GlyphHints hints, AF_Dimension dim)

Macro Definition Documentation

FT_COMPONENT

#define FT_COMPONENT   trace_afhints

Definition at line 32 of file afhints.c.

Function Documentation

af_axis_hints_new_edge()

af_axis_hints_new_edge	(	AF_AxisHints	axis,
		FT_Int	fpos,
		AF_Direction	dir,
		FT_Bool	top_to_bottom_hinting,
		FT_Memory	memory,
		AF_Edge *	anedge
	)

Definition at line 99 of file afhints.c.

  {
    FT_Error  error = FT_Err_Ok;
    AF_Edge   edge  = NULL;
    AF_Edge   edges;
 
 
    if ( axis->num_edges < AF_EDGES_EMBEDDED )
    {
      if ( !axis->edges )
      {
        axis->edges     = axis->embedded.edges;
        axis->max_edges = AF_EDGES_EMBEDDED;
      }
    }
    else if ( axis->num_edges >= axis->max_edges )
    {
      FT_Int  old_max = axis->max_edges;
      FT_Int  new_max = old_max;
      FT_Int  big_max = (FT_Int)( FT_INT_MAX / sizeof ( *edge ) );
 
 
      if ( old_max >= big_max )
      {
        error = FT_THROW( Out_Of_Memory );
        goto Exit;
      }
 
      new_max += ( new_max >> 2 ) + 4;
      if ( new_max < old_max || new_max > big_max )
        new_max = big_max;
 
      if ( axis->edges == axis->embedded.edges )
      {
        if ( FT_NEW_ARRAY( axis->edges, new_max ) )
          goto Exit;
        ft_memcpy( axis->edges, axis->embedded.edges,
                   sizeof ( axis->embedded.edges ) );
      }
      else
      {
        if ( FT_RENEW_ARRAY( axis->edges, old_max, new_max ) )
          goto Exit;
      }
 
      axis->max_edges = new_max;
    }
 
    edges = axis->edges;
    edge  = edges + axis->num_edges;
 
    while ( edge > edges )
    {
      if ( top_to_bottom_hinting ? ( edge[-1].fpos > fpos )
                                 : ( edge[-1].fpos < fpos ) )
        break;
 
      /* we want the edge with same position and minor direction */
      /* to appear before those in the major one in the list     */
      if ( edge[-1].fpos == fpos && dir == axis->major_dir )
        break;
 
      edge[0] = edge[-1];
      edge--;
    }
 
    axis->num_edges++;
 
  Exit:
    *anedge = edge;
    return error;
  }

Referenced by af_latin_hints_compute_edges().

af_axis_hints_new_segment()

af_axis_hints_new_segment	(	AF_AxisHints	axis,
		FT_Memory	memory,
		AF_Segment *	asegment
	)

Definition at line 38 of file afhints.c.

  {
    FT_Error    error   = FT_Err_Ok;
    AF_Segment  segment = NULL;
 
 
    if ( axis->num_segments < AF_SEGMENTS_EMBEDDED )
    {
      if ( !axis->segments )
      {
        axis->segments     = axis->embedded.segments;
        axis->max_segments = AF_SEGMENTS_EMBEDDED;
      }
    }
    else if ( axis->num_segments >= axis->max_segments )
    {
      FT_Int  old_max = axis->max_segments;
      FT_Int  new_max = old_max;
      FT_Int  big_max = (FT_Int)( FT_INT_MAX / sizeof ( *segment ) );
 
 
      if ( old_max >= big_max )
      {
        error = FT_THROW( Out_Of_Memory );
        goto Exit;
      }
 
      new_max += ( new_max >> 2 ) + 4;
      if ( new_max < old_max || new_max > big_max )
        new_max = big_max;
 
      if ( axis->segments == axis->embedded.segments )
      {
        if ( FT_NEW_ARRAY( axis->segments, new_max ) )
          goto Exit;
        ft_memcpy( axis->segments, axis->embedded.segments,
                   sizeof ( axis->embedded.segments ) );
      }
      else
      {
        if ( FT_RENEW_ARRAY( axis->segments, old_max, new_max ) )
          goto Exit;
      }
 
      axis->max_segments = new_max;
    }
 
    segment = axis->segments + axis->num_segments++;
 
  Exit:
    *asegment = segment;
    return error;
  }

Referenced by af_latin_hints_compute_segments().

af_direction_compute()

af_direction_compute	(	FT_Pos	dx,
		FT_Pos	dy
	)

Definition at line 613 of file afhints.c.

  {
    FT_Pos        ll, ss;  /* long and short arm lengths */
    AF_Direction  dir;     /* candidate direction        */
 
 
    if ( dy >= dx )
    {
      if ( dy >= -dx )
      {
        dir = AF_DIR_UP;
        ll  = dy;
        ss  = dx;
      }
      else
      {
        dir = AF_DIR_LEFT;
        ll  = -dx;
        ss  = dy;
      }
    }
    else /* dy < dx */
    {
      if ( dy >= -dx )
      {
        dir = AF_DIR_RIGHT;
        ll  = dx;
        ss  = dy;
      }
      else
      {
        dir = AF_DIR_DOWN;
        ll  = -dy;
        ss  = dx;
      }
    }
 
    /* return no direction if arm lengths do not differ enough       */
    /* (value 14 is heuristic, corresponding to approx. 4.1 degrees) */
    /* the long arm is never negative                                */
    if ( ll <= 14 * FT_ABS( ss ) )
      dir = AF_DIR_NONE;
 
    return dir;
  }

Referenced by af_glyph_hints_reload().

af_glyph_hints_align_edge_points()

af_glyph_hints_align_edge_points	(	AF_GlyphHints	hints,
		AF_Dimension	dim
	)

Definition at line 1181 of file afhints.c.

  {
    AF_AxisHints  axis          = & hints->axis[dim];
    AF_Segment    segments      = axis->segments;
    AF_Segment    segment_limit = segments + axis->num_segments;
    AF_Segment    seg;
 
 
    if ( dim == AF_DIMENSION_HORZ )
    {
      for ( seg = segments; seg < segment_limit; seg++ )
      {
        AF_Edge   edge = seg->edge;
        AF_Point  point, first, last;
 
 
        if ( !edge )
          continue;
 
        first = seg->first;
        last  = seg->last;
        point = first;
        for (;;)
        {
          point->x      = edge->pos;
          point->flags |= AF_FLAG_TOUCH_X;
 
          if ( point == last )
            break;
 
          point = point->next;
        }
      }
    }
    else
    {
      for ( seg = segments; seg < segment_limit; seg++ )
      {
        AF_Edge   edge = seg->edge;
        AF_Point  point, first, last;
 
 
        if ( !edge )
          continue;
 
        first = seg->first;
        last  = seg->last;
        point = first;
        for (;;)
        {
          point->y      = edge->pos;
          point->flags |= AF_FLAG_TOUCH_Y;
 
          if ( point == last )
            break;
 
          point = point->next;
        }
      }
    }
  }

Referenced by af_latin_hints_apply().

af_glyph_hints_align_strong_points()

af_glyph_hints_align_strong_points	(	AF_GlyphHints	hints,
		AF_Dimension	dim
	)

Definition at line 1256 of file afhints.c.

  {
    AF_Point      points      = hints->points;
    AF_Point      point_limit = points + hints->num_points;
    AF_AxisHints  axis        = &hints->axis[dim];
    AF_Edge       edges       = axis->edges;
    AF_Edge       edge_limit  = edges + axis->num_edges;
    FT_UInt       touch_flag;
 
 
    if ( dim == AF_DIMENSION_HORZ )
      touch_flag = AF_FLAG_TOUCH_X;
    else
      touch_flag  = AF_FLAG_TOUCH_Y;
 
    if ( edges < edge_limit )
    {
      AF_Point  point;
      AF_Edge   edge;
 
 
      for ( point = points; point < point_limit; point++ )
      {
        FT_Pos  u, ou, fu;  /* point position */
        FT_Pos  delta;
 
 
        if ( point->flags & touch_flag )
          continue;
 
        /* if this point is candidate to weak interpolation, we       */
        /* interpolate it after all strong points have been processed */
 
        if ( ( point->flags & AF_FLAG_WEAK_INTERPOLATION ) )
          continue;
 
        if ( dim == AF_DIMENSION_VERT )
        {
          u  = point->fy;
          ou = point->oy;
        }
        else
        {
          u  = point->fx;
          ou = point->ox;
        }
 
        fu = u;
 
        /* is the point before the first edge? */
        edge  = edges;
        delta = edge->fpos - u;
        if ( delta >= 0 )
        {
          u = edge->pos - ( edge->opos - ou );
          goto Store_Point;
        }
 
        /* is the point after the last edge? */
        edge  = edge_limit - 1;
        delta = u - edge->fpos;
        if ( delta >= 0 )
        {
          u = edge->pos + ( ou - edge->opos );
          goto Store_Point;
        }
 
        {
          FT_PtrDist  min, max, mid;
          FT_Pos      fpos;
 
 
          /* find enclosing edges */
          min = 0;
          max = edge_limit - edges;
 
#if 1
          /* for a small number of edges, a linear search is better */
          if ( max <= 8 )
          {
            FT_PtrDist  nn;
 
 
            for ( nn = 0; nn < max; nn++ )
              if ( edges[nn].fpos >= u )
                break;
 
            if ( edges[nn].fpos == u )
            {
              u = edges[nn].pos;
              goto Store_Point;
            }
            min = nn;
          }
          else
#endif
          while ( min < max )
          {
            mid  = ( max + min ) >> 1;
            edge = edges + mid;
            fpos = edge->fpos;
 
            if ( u < fpos )
              max = mid;
            else if ( u > fpos )
              min = mid + 1;
            else
            {
              /* we are on the edge */
              u = edge->pos;
              goto Store_Point;
            }
          }
 
          /* point is not on an edge */
          {
            AF_Edge  before = edges + min - 1;
            AF_Edge  after  = edges + min + 0;
 
 
            /* assert( before && after && before != after ) */
            if ( before->scale == 0 )
              before->scale = FT_DivFix( after->pos - before->pos,
                                         after->fpos - before->fpos );
 
            u = before->pos + FT_MulFix( fu - before->fpos,
                                         before->scale );
          }
        }
 
      Store_Point:
        /* save the point position */
        if ( dim == AF_DIMENSION_HORZ )
          point->x = u;
        else
          point->y = u;
 
        point->flags |= touch_flag;
      }
    }
  }

Referenced by af_latin_hints_apply().

af_glyph_hints_align_weak_points()

af_glyph_hints_align_weak_points	(	AF_GlyphHints	hints,
		AF_Dimension	dim
	)

Definition at line 1507 of file afhints.c.

  {
    AF_Point   points        = hints->points;
    AF_Point   point_limit   = points + hints->num_points;
    AF_Point*  contour       = hints->contours;
    AF_Point*  contour_limit = contour + hints->num_contours;
    FT_UInt    touch_flag;
    AF_Point   point;
    AF_Point   end_point;
    AF_Point   first_point;
 
 
    /* PASS 1: Move segment points to edge positions */
 
    if ( dim == AF_DIMENSION_HORZ )
    {
      touch_flag = AF_FLAG_TOUCH_X;
 
      for ( point = points; point < point_limit; point++ )
      {
        point->u = point->x;
        point->v = point->ox;
      }
    }
    else
    {
      touch_flag = AF_FLAG_TOUCH_Y;
 
      for ( point = points; point < point_limit; point++ )
      {
        point->u = point->y;
        point->v = point->oy;
      }
    }
 
    for ( ; contour < contour_limit; contour++ )
    {
      AF_Point  first_touched, last_touched;
 
 
      point       = *contour;
      end_point   = point->prev;
      first_point = point;
 
      /* find first touched point */
      for (;;)
      {
        if ( point > end_point )  /* no touched point in contour */
          goto NextContour;
 
        if ( point->flags & touch_flag )
          break;
 
        point++;
      }
 
      first_touched = point;
 
      for (;;)
      {
        FT_ASSERT( point <= end_point                 &&
                   ( point->flags & touch_flag ) != 0 );
 
        /* skip any touched neighbours */
        while ( point < end_point                    &&
                ( point[1].flags & touch_flag ) != 0 )
          point++;
 
        last_touched = point;
 
        /* find the next touched point, if any */
        point++;
        for (;;)
        {
          if ( point > end_point )
            goto EndContour;
 
          if ( ( point->flags & touch_flag ) != 0 )
            break;
 
          point++;
        }
 
        /* interpolate between last_touched and point */
        af_iup_interp( last_touched + 1, point - 1,
                       last_touched, point );
      }
 
    EndContour:
      /* special case: only one point was touched */
      if ( last_touched == first_touched )
        af_iup_shift( first_point, end_point, first_touched );
 
      else /* interpolate the last part */
      {
        if ( last_touched < end_point )
          af_iup_interp( last_touched + 1, end_point,
                         last_touched, first_touched );
 
        if ( first_touched > points )
          af_iup_interp( first_point, first_touched - 1,
                         last_touched, first_touched );
      }
 
    NextContour:
      ;
    }
 
    /* now save the interpolated values back to x/y */
    if ( dim == AF_DIMENSION_HORZ )
    {
      for ( point = points; point < point_limit; point++ )
        point->x = point->u;
    }
    else
    {
      for ( point = points; point < point_limit; point++ )
        point->y = point->u;
    }
  }

Referenced by af_latin_hints_apply().

af_glyph_hints_done()

af_glyph_hints_done

(

AF_GlyphHints

hints

)

Definition at line 672 of file afhints.c.

  {
    FT_Memory  memory;
    int        dim;
 
 
    if ( !( hints && hints->memory ) )
      return;
 
    memory = hints->memory;
 
    /*
     *  note that we don't need to free the segment and edge
     *  buffers since they are really within the hints->points array
     */
    for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
    {
      AF_AxisHints  axis = &hints->axis[dim];
 
 
      axis->num_segments = 0;
      axis->max_segments = 0;
      if ( axis->segments != axis->embedded.segments )
        FT_FREE( axis->segments );
 
      axis->num_edges = 0;
      axis->max_edges = 0;
      if ( axis->edges != axis->embedded.edges )
        FT_FREE( axis->edges );
    }
 
    if ( hints->contours != hints->embedded.contours )
      FT_FREE( hints->contours );
    hints->max_contours = 0;
    hints->num_contours = 0;
 
    if ( hints->points != hints->embedded.points )
      FT_FREE( hints->points );
    hints->max_points = 0;
    hints->num_points = 0;
 
    hints->memory = NULL;
  }

Referenced by af_autofitter_done(), af_autofitter_load_glyph(), and af_latin_metrics_init_widths().

af_glyph_hints_init()

af_glyph_hints_init	(	AF_GlyphHints	hints,
		FT_Memory	memory
	)

Definition at line 662 of file afhints.c.

  {
    /* no need to initialize the embedded items */
    FT_MEM_ZERO( hints, sizeof ( *hints ) - sizeof ( hints->embedded ) );
    hints->memory = memory;
  }

Referenced by af_autofitter_load_glyph(), and af_latin_metrics_init_widths().

af_glyph_hints_reload()

af_glyph_hints_reload	(	AF_GlyphHints	hints,
		FT_Outline *	outline
	)

Definition at line 732 of file afhints.c.

  {
    FT_Error   error   = FT_Err_Ok;
    AF_Point   points;
    FT_UInt    old_max, new_max;
    FT_Fixed   x_scale = hints->x_scale;
    FT_Fixed   y_scale = hints->y_scale;
    FT_Pos     x_delta = hints->x_delta;
    FT_Pos     y_delta = hints->y_delta;
    FT_Memory  memory  = hints->memory;
 
 
    hints->num_points   = 0;
    hints->num_contours = 0;
 
    hints->axis[0].num_segments = 0;
    hints->axis[0].num_edges    = 0;
    hints->axis[1].num_segments = 0;
    hints->axis[1].num_edges    = 0;
 
    /* first of all, reallocate the contours array if necessary */
    new_max = (FT_UInt)outline->n_contours;
    old_max = (FT_UInt)hints->max_contours;
 
    if ( new_max <= AF_CONTOURS_EMBEDDED )
    {
      if ( !hints->contours )
      {
        hints->contours     = hints->embedded.contours;
        hints->max_contours = AF_CONTOURS_EMBEDDED;
      }
    }
    else if ( new_max > old_max )
    {
      if ( hints->contours == hints->embedded.contours )
        hints->contours = NULL;
 
      new_max = ( new_max + 3 ) & ~3U; /* round up to a multiple of 4 */
 
      if ( FT_RENEW_ARRAY( hints->contours, old_max, new_max ) )
        goto Exit;
 
      hints->max_contours = (FT_Int)new_max;
    }
 
    /*
     *  then reallocate the points arrays if necessary --
     *  note that we reserve two additional point positions, used to
     *  hint metrics appropriately
     */
    new_max = (FT_UInt)( outline->n_points + 2 );
    old_max = (FT_UInt)hints->max_points;
 
    if ( new_max <= AF_POINTS_EMBEDDED )
    {
      if ( !hints->points )
      {
        hints->points     = hints->embedded.points;
        hints->max_points = AF_POINTS_EMBEDDED;
      }
    }
    else if ( new_max > old_max )
    {
      if ( hints->points == hints->embedded.points )
        hints->points = NULL;
 
      new_max = ( new_max + 2 + 7 ) & ~7U; /* round up to a multiple of 8 */
 
      if ( FT_RENEW_ARRAY( hints->points, old_max, new_max ) )
        goto Exit;
 
      hints->max_points = (FT_Int)new_max;
    }
 
    hints->num_points   = outline->n_points;
    hints->num_contours = outline->n_contours;
 
    /* We can't rely on the value of `FT_Outline.flags' to know the fill   */
    /* direction used for a glyph, given that some fonts are broken (e.g., */
    /* the Arphic ones).  We thus recompute it each time we need to.       */
    /*                                                                     */
    hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_UP;
    hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_LEFT;
 
    if ( FT_Outline_Get_Orientation( outline ) == FT_ORIENTATION_POSTSCRIPT )
    {
      hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_DOWN;
      hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_RIGHT;
    }
 
    hints->x_scale = x_scale;
    hints->y_scale = y_scale;
    hints->x_delta = x_delta;
    hints->y_delta = y_delta;
 
    hints->xmin_delta = 0;
    hints->xmax_delta = 0;
 
    points = hints->points;
    if ( hints->num_points == 0 )
      goto Exit;
 
    {
      AF_Point  point;
      AF_Point  point_limit = points + hints->num_points;
 
      /* value 20 in `near_limit' is heuristic */
      FT_UInt  units_per_em = hints->metrics->scaler.face->units_per_EM;
      FT_Int   near_limit   = 20 * units_per_em / 2048;
 
 
      /* compute coordinates & Bezier flags, next and prev */
      {
        FT_Vector*  vec           = outline->points;
        char*       tag           = outline->tags;
        FT_Short    endpoint      = outline->contours[0];
        AF_Point    end           = points + endpoint;
        AF_Point    prev          = end;
        FT_Int      contour_index = 0;
 
 
        for ( point = points; point < point_limit; point++, vec++, tag++ )
        {
          FT_Pos  out_x, out_y;
 
 
          point->in_dir  = (FT_Char)AF_DIR_NONE;
          point->out_dir = (FT_Char)AF_DIR_NONE;
 
          point->fx = (FT_Short)vec->x;
          point->fy = (FT_Short)vec->y;
          point->ox = point->x = FT_MulFix( vec->x, x_scale ) + x_delta;
          point->oy = point->y = FT_MulFix( vec->y, y_scale ) + y_delta;
 
          end->fx = (FT_Short)outline->points[endpoint].x;
          end->fy = (FT_Short)outline->points[endpoint].y;
 
          switch ( FT_CURVE_TAG( *tag ) )
          {
          case FT_CURVE_TAG_CONIC:
            point->flags = AF_FLAG_CONIC;
            break;
          case FT_CURVE_TAG_CUBIC:
            point->flags = AF_FLAG_CUBIC;
            break;
          default:
            point->flags = AF_FLAG_NONE;
          }
 
          out_x = point->fx - prev->fx;
          out_y = point->fy - prev->fy;
 
          if ( FT_ABS( out_x ) + FT_ABS( out_y ) < near_limit )
            prev->flags |= AF_FLAG_NEAR;
 
          point->prev = prev;
          prev->next  = point;
          prev        = point;
 
          if ( point == end )
          {
            if ( ++contour_index < outline->n_contours )
            {
              endpoint = outline->contours[contour_index];
              end      = points + endpoint;
              prev     = end;
            }
          }
        }
      }
 
      /* set up the contours array */
      {
        AF_Point*  contour       = hints->contours;
        AF_Point*  contour_limit = contour + hints->num_contours;
        short*     end           = outline->contours;
        short      idx           = 0;
 
 
        for ( ; contour < contour_limit; contour++, end++ )
        {
          contour[0] = points + idx;
          idx        = (short)( end[0] + 1 );
        }
      }
 
      {
        /*
         *  Compute directions of `in' and `out' vectors.
         *
         *  Note that distances between points that are very near to each
         *  other are accumulated.  In other words, the auto-hinter either
         *  prepends the small vectors between near points to the first
         *  non-near vector, or the sum of small vector lengths exceeds a
         *  threshold, thus `grouping' the small vectors.  All intermediate
         *  points are tagged as weak; the directions are adjusted also to
         *  be equal to the accumulated one.
         */
 
        FT_Int  near_limit2 = 2 * near_limit - 1;
 
        AF_Point*  contour;
        AF_Point*  contour_limit = hints->contours + hints->num_contours;
 
 
        for ( contour = hints->contours; contour < contour_limit; contour++ )
        {
          AF_Point  first = *contour;
          AF_Point  next, prev, curr;
 
          FT_Pos  out_x, out_y;
 
 
          /* since the first point of a contour could be part of a */
          /* series of near points, go backwards to find the first */
          /* non-near point and adjust `first'                     */
 
          point = first;
          prev  = first->prev;
 
          while ( prev != first )
          {
            out_x = point->fx - prev->fx;
            out_y = point->fy - prev->fy;
 
            /*
             *  We use Taxicab metrics to measure the vector length.
             *
             *  Note that the accumulated distances so far could have the
             *  opposite direction of the distance measured here.  For this
             *  reason we use `near_limit2' for the comparison to get a
             *  non-near point even in the worst case.
             */
            if ( FT_ABS( out_x ) + FT_ABS( out_y ) >= near_limit2 )
              break;
 
            point = prev;
            prev  = prev->prev;
          }
 
          /* adjust first point */
          first = point;
 
          /* now loop over all points of the contour to get */
          /* `in' and `out' vector directions               */
 
          curr = first;
 
          /*
           *  We abuse the `u' and `v' fields to store index deltas to the
           *  next and previous non-near point, respectively.
           *
           *  To avoid problems with not having non-near points, we point to
           *  `first' by default as the next non-near point.
           *
           */
          curr->u  = (FT_Pos)( first - curr );
          first->v = -curr->u;
 
          out_x = 0;
          out_y = 0;
 
          next = first;
          do
          {
            AF_Direction  out_dir;
 
 
            point = next;
            next  = point->next;
 
            out_x += next->fx - point->fx;
            out_y += next->fy - point->fy;
 
            if ( FT_ABS( out_x ) + FT_ABS( out_y ) < near_limit )
            {
              next->flags |= AF_FLAG_WEAK_INTERPOLATION;
              continue;
            }
 
            curr->u = (FT_Pos)( next - curr );
            next->v = -curr->u;
 
            out_dir = af_direction_compute( out_x, out_y );
 
            /* adjust directions for all points inbetween; */
            /* the loop also updates position of `curr'    */
            curr->out_dir = (FT_Char)out_dir;
            for ( curr = curr->next; curr != next; curr = curr->next )
            {
              curr->in_dir  = (FT_Char)out_dir;
              curr->out_dir = (FT_Char)out_dir;
            }
            next->in_dir = (FT_Char)out_dir;
 
            curr->u  = (FT_Pos)( first - curr );
            first->v = -curr->u;
 
            out_x = 0;
            out_y = 0;
 
          } while ( next != first );
        }
 
        /*
         *  The next step is to `simplify' an outline's topology so that we
         *  can identify local extrema more reliably: A series of
         *  non-horizontal or non-vertical vectors pointing into the same
         *  quadrant are handled as a single, long vector.  From a
         *  topological point of the view, the intermediate points are of no
         *  interest and thus tagged as weak.
         */
 
        for ( point = points; point < point_limit; point++ )
        {
          if ( point->flags & AF_FLAG_WEAK_INTERPOLATION )
            continue;
 
          if ( point->in_dir  == AF_DIR_NONE &&
               point->out_dir == AF_DIR_NONE )
          {
            /* check whether both vectors point into the same quadrant */
 
            FT_Pos  in_x, in_y;
            FT_Pos  out_x, out_y;
 
            AF_Point  next_u = point + point->u;
            AF_Point  prev_v = point + point->v;
 
 
            in_x = point->fx - prev_v->fx;
            in_y = point->fy - prev_v->fy;
 
            out_x = next_u->fx - point->fx;
            out_y = next_u->fy - point->fy;
 
            if ( ( in_x ^ out_x ) >= 0 && ( in_y ^ out_y ) >= 0 )
            {
              /* yes, so tag current point as weak */
              /* and update index deltas           */
 
              point->flags |= AF_FLAG_WEAK_INTERPOLATION;
 
              prev_v->u = (FT_Pos)( next_u - prev_v );
              next_u->v = -prev_v->u;
            }
          }
        }
 
        /*
         *  Finally, check for remaining weak points.  Everything else not
         *  collected in edges so far is then implicitly classified as strong
         *  points.
         */
 
        for ( point = points; point < point_limit; point++ )
        {
          if ( point->flags & AF_FLAG_WEAK_INTERPOLATION )
            continue;
 
          if ( point->flags & AF_FLAG_CONTROL )
          {
            /* control points are always weak */
          Is_Weak_Point:
            point->flags |= AF_FLAG_WEAK_INTERPOLATION;
          }
          else if ( point->out_dir == point->in_dir )
          {
            if ( point->out_dir != AF_DIR_NONE )
            {
              /* current point lies on a horizontal or          */
              /* vertical segment (but doesn't start or end it) */
              goto Is_Weak_Point;
            }
 
            {
              AF_Point  next_u = point + point->u;
              AF_Point  prev_v = point + point->v;
 
 
              if ( ft_corner_is_flat( point->fx  - prev_v->fx,
                                      point->fy  - prev_v->fy,
                                      next_u->fx - point->fx,
                                      next_u->fy - point->fy ) )
              {
                /* either the `in' or the `out' vector is much more  */
                /* dominant than the other one, so tag current point */
                /* as weak and update index deltas                   */
 
                prev_v->u = (FT_Pos)( next_u - prev_v );
                next_u->v = -prev_v->u;
 
                goto Is_Weak_Point;
              }
            }
          }
          else if ( point->in_dir == -point->out_dir )
          {
            /* current point forms a spike */
            goto Is_Weak_Point;
          }
        }
      }
    }
 
  Exit:
    return error;
  }

Referenced by af_dummy_hints_apply(), af_latin_hints_apply(), and af_latin_metrics_init_widths().

af_glyph_hints_rescale()

af_glyph_hints_rescale	(	AF_GlyphHints	hints,
		AF_StyleMetrics	metrics
	)

Definition at line 720 of file afhints.c.

  {
    hints->metrics      = metrics;
    hints->scaler_flags = metrics->scaler.flags;
  }

Referenced by af_dummy_hints_init(), af_latin_hints_init(), and af_latin_metrics_init_widths().

af_glyph_hints_save()

af_glyph_hints_save	(	AF_GlyphHints	hints,
		FT_Outline *	outline
	)

Definition at line 1146 of file afhints.c.

  {
    AF_Point    point = hints->points;
    AF_Point    limit = point + hints->num_points;
    FT_Vector*  vec   = outline->points;
    char*       tag   = outline->tags;
 
 
    for ( ; point < limit; point++, vec++, tag++ )
    {
      vec->x = point->x;
      vec->y = point->y;
 
      if ( point->flags & AF_FLAG_CONIC )
        tag[0] = FT_CURVE_TAG_CONIC;
      else if ( point->flags & AF_FLAG_CUBIC )
        tag[0] = FT_CURVE_TAG_CUBIC;
      else
        tag[0] = FT_CURVE_TAG_ON;
    }
  }

Referenced by af_dummy_hints_apply(), and af_latin_hints_apply().

af_iup_interp()

static void af_iup_interp ( AF_Point  p1, AF_Point  p2, AF_Point  ref1, AF_Point  ref2  )

static

Definition at line 1439 of file afhints.c.

  {
    AF_Point  p;
    FT_Pos    u, v1, v2, u1, u2, d1, d2;
 
 
    if ( p1 > p2 )
      return;
 
    if ( ref1->v > ref2->v )
    {
      p    = ref1;
      ref1 = ref2;
      ref2 = p;
    }
 
    v1 = ref1->v;
    v2 = ref2->v;
    u1 = ref1->u;
    u2 = ref2->u;
    d1 = u1 - v1;
    d2 = u2 - v2;
 
    if ( u1 == u2 || v1 == v2 )
    {
      for ( p = p1; p <= p2; p++ )
      {
        u = p->v;
 
        if ( u <= v1 )
          u += d1;
        else if ( u >= v2 )
          u += d2;
        else
          u = u1;
 
        p->u = u;
      }
    }
    else
    {
      FT_Fixed  scale = FT_DivFix( u2 - u1, v2 - v1 );
 
 
      for ( p = p1; p <= p2; p++ )
      {
        u = p->v;
 
        if ( u <= v1 )
          u += d1;
        else if ( u >= v2 )
          u += d2;
        else
          u = u1 + FT_MulFix( u - v1, scale );
 
        p->u = u;
      }
    }
  }

Referenced by af_glyph_hints_align_weak_points().

af_iup_shift()

static void af_iup_shift ( AF_Point  p1, AF_Point  p2, AF_Point  ref  )

static

Definition at line 1412 of file afhints.c.

  {
    AF_Point  p;
    FT_Pos    delta = ref->u - ref->v;
 
 
    if ( delta == 0 )
      return;
 
    for ( p = p1; p < ref; p++ )
      p->u = p->v + delta;
 
    for ( p = ref + 1; p <= p2; p++ )
      p->u = p->v + delta;
  }

Referenced by af_glyph_hints_align_weak_points().