pshalgo.c File Reference

#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftcalc.h>
#include "pshalgo.h"
#include "pshnterr.h"

Include dependency graph for pshalgo.c:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Macros
#define	FT_COMPONENT   pshalgo
#define	COMPUTE_INFLEXS   /* compute inflection points to optimize `S' */
#define	xxDEBUG_ZONES
#define	psh_corner_is_flat   ft_corner_is_flat
#define	psh_corner_orientation   ft_corner_orientation
#define	PSH_STRONG_THRESHOLD   32
#define	PSH_STRONG_THRESHOLD_MAXIMUM   30
#define	PSH_MAX_STRONG_INTERNAL   16

Functions
static FT_Int	psh_hint_overlap (PSH_Hint hint1, PSH_Hint hint2)
static void	psh_hint_table_done (PSH_Hint_Table table, FT_Memory memory)
static void	psh_hint_table_deactivate (PSH_Hint_Table table)
static void	psh_hint_table_record (PSH_Hint_Table table, FT_UInt idx)
static void	psh_hint_table_record_mask (PSH_Hint_Table table, PS_Mask hint_mask)
static FT_Error	psh_hint_table_init (PSH_Hint_Table table, PS_Hint_Table hints, PS_Mask_Table hint_masks, PS_Mask_Table counter_masks, FT_Memory memory)
static void	psh_hint_table_activate_mask (PSH_Hint_Table table, PS_Mask hint_mask)
static FT_Pos	psh_dimension_quantize_len (PSH_Dimension dim, FT_Pos len, FT_Bool do_snapping)
static FT_Fixed	psh_hint_snap_stem_side_delta (FT_Fixed pos, FT_Fixed len)
static void	psh_hint_align (PSH_Hint hint, PSH_Globals globals, FT_Int dimension, PSH_Glyph glyph)
static void	psh_hint_table_align_hints (PSH_Hint_Table table, PSH_Globals globals, FT_Int dimension, PSH_Glyph glyph)
static void	psh_glyph_compute_inflections (PSH_Glyph glyph)
static void	psh_glyph_done (PSH_Glyph glyph)
static int	psh_compute_dir (FT_Pos dx, FT_Pos dy)
static void	psh_glyph_load_points (PSH_Glyph glyph, FT_Int dimension)
static void	psh_glyph_save_points (PSH_Glyph glyph, FT_Int dimension)
static FT_Error	psh_glyph_init (PSH_Glyph glyph, FT_Outline *outline, PS_Hints ps_hints, PSH_Globals globals)
static void	psh_glyph_compute_extrema (PSH_Glyph glyph)
static void	psh_hint_table_find_strong_points (PSH_Hint_Table table, PSH_Point point, FT_UInt count, FT_Int threshold, FT_Int major_dir)
static void	psh_glyph_find_strong_points (PSH_Glyph glyph, FT_Int dimension)
static void	psh_glyph_find_blue_points (PSH_Blues blues, PSH_Glyph glyph)
static void	psh_glyph_interpolate_strong_points (PSH_Glyph glyph, FT_Int dimension)
static void	psh_glyph_interpolate_normal_points (PSH_Glyph glyph, FT_Int dimension)
static void	psh_glyph_interpolate_other_points (PSH_Glyph glyph, FT_Int dimension)
FT_Error	ps_hints_apply (PS_Hints ps_hints, FT_Outline *outline, PSH_Globals globals, FT_Render_Mode hint_mode)

Macro Definition Documentation

COMPUTE_INFLEXS

#define COMPUTE_INFLEXS   /* compute inflection points to optimize `S' */

Definition at line 38 of file pshalgo.c.

FT_COMPONENT

#define FT_COMPONENT   pshalgo

Definition at line 28 of file pshalgo.c.

psh_corner_is_flat

#define psh_corner_is_flat   ft_corner_is_flat

Definition at line 918 of file pshalgo.c.

psh_corner_orientation

#define psh_corner_orientation   ft_corner_orientation

Definition at line 919 of file pshalgo.c.

PSH_MAX_STRONG_INTERNAL

#define PSH_MAX_STRONG_INTERNAL   16

Definition at line 1766 of file pshalgo.c.

PSH_STRONG_THRESHOLD

#define PSH_STRONG_THRESHOLD   32

Definition at line 1556 of file pshalgo.c.

PSH_STRONG_THRESHOLD_MAXIMUM

#define PSH_STRONG_THRESHOLD_MAXIMUM   30

Definition at line 1559 of file pshalgo.c.

xxDEBUG_ZONES

#define xxDEBUG_ZONES

Definition at line 890 of file pshalgo.c.

Function Documentation

ps_hints_apply()

FT_Error ps_hints_apply	(	PS_Hints	ps_hints,
		FT_Outline *	outline,
		PSH_Globals	globals,
		FT_Render_Mode	hint_mode
	)

Definition at line 2069 of file pshalgo.c.

  {
    PSH_GlyphRec  glyphrec;
    PSH_Glyph     glyph = &glyphrec;
    FT_Error      error;
#ifdef DEBUG_HINTER
    FT_Memory     memory;
#endif
    FT_Int        dimension;
 
 
    /* something to do? */
    if ( outline->n_points == 0 || outline->n_contours == 0 )
      return FT_Err_Ok;
 
#ifdef DEBUG_HINTER
 
    memory = globals->memory;
 
    if ( ps_debug_glyph )
    {
      psh_glyph_done( ps_debug_glyph );
      FT_FREE( ps_debug_glyph );
    }
 
    if ( FT_NEW( glyph ) )
      return error;
 
    ps_debug_glyph = glyph;
 
#endif /* DEBUG_HINTER */
 
    error = psh_glyph_init( glyph, outline, ps_hints, globals );
    if ( error )
      goto Exit;
 
    /* try to optimize the y_scale so that the top of non-capital letters
     * is aligned on a pixel boundary whenever possible
     */
    {
      PSH_Dimension  dim_x = &glyph->globals->dimension[0];
      PSH_Dimension  dim_y = &glyph->globals->dimension[1];
 
      FT_Fixed  x_scale = dim_x->scale_mult;
      FT_Fixed  y_scale = dim_y->scale_mult;
 
      FT_Fixed  old_x_scale = x_scale;
      FT_Fixed  old_y_scale = y_scale;
 
      FT_Fixed  scaled;
      FT_Fixed  fitted;
 
      FT_Bool  rescale = FALSE;
 
 
      scaled = FT_MulFix( globals->blues.normal_top.zones->org_ref, y_scale );
      fitted = FT_PIX_ROUND( scaled );
 
      if ( fitted != 0 && scaled != fitted )
      {
        rescale = TRUE;
 
        y_scale = FT_MulDiv( y_scale, fitted, scaled );
 
        if ( fitted < scaled )
          x_scale -= x_scale / 50;
 
        psh_globals_set_scale( glyph->globals, x_scale, y_scale, 0, 0 );
      }
 
      glyph->do_horz_hints = 1;
      glyph->do_vert_hints = 1;
 
      glyph->do_horz_snapping = FT_BOOL( hint_mode == FT_RENDER_MODE_MONO ||
                                         hint_mode == FT_RENDER_MODE_LCD  );
 
      glyph->do_vert_snapping = FT_BOOL( hint_mode == FT_RENDER_MODE_MONO  ||
                                         hint_mode == FT_RENDER_MODE_LCD_V );
 
      glyph->do_stem_adjust   = FT_BOOL( hint_mode != FT_RENDER_MODE_LIGHT );
 
      for ( dimension = 0; dimension < 2; dimension++ )
      {
        /* load outline coordinates into glyph */
        psh_glyph_load_points( glyph, dimension );
 
        /* compute local extrema */
        psh_glyph_compute_extrema( glyph );
 
        /* compute aligned stem/hints positions */
        psh_hint_table_align_hints( &glyph->hint_tables[dimension],
                                    glyph->globals,
                                    dimension,
                                    glyph );
 
        /* find strong points, align them, then interpolate others */
        psh_glyph_find_strong_points( glyph, dimension );
        if ( dimension == 1 )
          psh_glyph_find_blue_points( &globals->blues, glyph );
        psh_glyph_interpolate_strong_points( glyph, dimension );
        psh_glyph_interpolate_normal_points( glyph, dimension );
        psh_glyph_interpolate_other_points( glyph, dimension );
 
        /* save hinted coordinates back to outline */
        psh_glyph_save_points( glyph, dimension );
 
        if ( rescale )
          psh_globals_set_scale( glyph->globals,
                                 old_x_scale, old_y_scale, 0, 0 );
      }
    }
 
  Exit:
 
#ifndef DEBUG_HINTER
    psh_glyph_done( glyph );
#endif
 
    return error;
  }

Referenced by t1_hints_funcs_init(), and t2_hints_funcs_init().

psh_compute_dir()

static int psh_compute_dir ( FT_Pos  dx, FT_Pos  dy  )

static

Definition at line 1053 of file pshalgo.c.

  {
    FT_Pos  ax, ay;
    int     result = PSH_DIR_NONE;
 
 
    ax = FT_ABS( dx );
    ay = FT_ABS( dy );
 
    if ( ay * 12 < ax )
    {
      /* |dy| <<< |dx|  means a near-horizontal segment */
      result = ( dx >= 0 ) ? PSH_DIR_RIGHT : PSH_DIR_LEFT;
    }
    else if ( ax * 12 < ay )
    {
      /* |dx| <<< |dy|  means a near-vertical segment */
      result = ( dy >= 0 ) ? PSH_DIR_UP : PSH_DIR_DOWN;
    }
 
    return result;
  }

Referenced by psh_glyph_init().

psh_dimension_quantize_len()

static FT_Pos psh_dimension_quantize_len ( PSH_Dimension  dim, FT_Pos  len, FT_Bool  do_snapping  )

static

Definition at line 343 of file pshalgo.c.

  {
    if ( len <= 64 )
      len = 64;
    else
    {
      FT_Pos  delta = len - dim->stdw.widths[0].cur;
 
 
      if ( delta < 0 )
        delta = -delta;
 
      if ( delta < 40 )
      {
        len = dim->stdw.widths[0].cur;
        if ( len < 48 )
          len = 48;
      }
 
      if ( len < 3 * 64 )
      {
        delta = ( len & 63 );
        len  &= -64;
 
        if ( delta < 10 )
          len += delta;
 
        else if ( delta < 32 )
          len += 10;
 
        else if ( delta < 54 )
          len += 54;
 
        else
          len += delta;
      }
      else
        len = FT_PIX_ROUND( len );
    }
 
    if ( do_snapping )
      len = FT_PIX_ROUND( len );
 
    return  len;
  }

Referenced by psh_hint_align().

psh_glyph_compute_extrema()

static void psh_glyph_compute_extrema ( PSH_Glyph  glyph )

static

Definition at line 1288 of file pshalgo.c.

  {
    FT_UInt  n;
 
 
    /* first of all, compute all local extrema */
    for ( n = 0; n < glyph->num_contours; n++ )
    {
      PSH_Point  first = glyph->contours[n].start;
      PSH_Point  point, before, after;
 
 
      if ( glyph->contours[n].count == 0 )
        continue;
 
      point  = first;
      before = point;
 
      do
      {
        before = before->prev;
        if ( before == first )
          goto Skip;
 
      } while ( before->org_u == point->org_u );
 
      first = point = before->next;
 
      for (;;)
      {
        after = point;
        do
        {
          after = after->next;
          if ( after == first )
            goto Next;
 
        } while ( after->org_u == point->org_u );
 
        if ( before->org_u < point->org_u )
        {
          if ( after->org_u < point->org_u )
          {
            /* local maximum */
            goto Extremum;
          }
        }
        else /* before->org_u > point->org_u */
        {
          if ( after->org_u > point->org_u )
          {
            /* local minimum */
          Extremum:
            do
            {
              psh_point_set_extremum( point );
              point = point->next;
 
            } while ( point != after );
          }
        }
 
        before = after->prev;
        point  = after;
 
      } /* for  */
 
    Next:
      ;
    }
 
    /* for each extremum, determine its direction along the */
    /* orthogonal axis                                      */
    for ( n = 0; n < glyph->num_points; n++ )
    {
      PSH_Point  point, before, after;
 
 
      point  = &glyph->points[n];
      before = point;
      after  = point;
 
      if ( psh_point_is_extremum( point ) )
      {
        do
        {
          before = before->prev;
          if ( before == point )
            goto Skip;
 
        } while ( before->org_v == point->org_v );
 
        do
        {
          after = after->next;
          if ( after == point )
            goto Skip;
 
        } while ( after->org_v == point->org_v );
      }
 
      if ( before->org_v < point->org_v &&
           after->org_v  > point->org_v )
      {
        psh_point_set_positive( point );
      }
      else if ( before->org_v > point->org_v &&
                after->org_v  < point->org_v )
      {
        psh_point_set_negative( point );
      }
 
    Skip:
      ;
    }
  }

Referenced by ps_hints_apply().

psh_glyph_compute_inflections()

static void psh_glyph_compute_inflections ( PSH_Glyph  glyph )

static

Definition at line 926 of file pshalgo.c.

  {
    FT_UInt  n;
 
 
    for ( n = 0; n < glyph->num_contours; n++ )
    {
      PSH_Point  first, start, end, before, after;
      FT_Pos     in_x, in_y, out_x, out_y;
      FT_Int     orient_prev, orient_cur;
      FT_Int     finished = 0;
 
 
      /* we need at least 4 points to create an inflection point */
      if ( glyph->contours[n].count < 4 )
        continue;
 
      /* compute first segment in contour */
      first = glyph->contours[n].start;
 
      start = end = first;
      do
      {
        end = end->next;
        if ( end == first )
          goto Skip;
 
        in_x = end->org_u - start->org_u;
        in_y = end->org_v - start->org_v;
 
      } while ( in_x == 0 && in_y == 0 );
 
      /* extend the segment start whenever possible */
      before = start;
      do
      {
        do
        {
          start  = before;
          before = before->prev;
          if ( before == first )
            goto Skip;
 
          out_x = start->org_u - before->org_u;
          out_y = start->org_v - before->org_v;
 
        } while ( out_x == 0 && out_y == 0 );
 
        orient_prev = psh_corner_orientation( in_x, in_y, out_x, out_y );
 
      } while ( orient_prev == 0 );
 
      first = start;
      in_x  = out_x;
      in_y  = out_y;
 
      /* now, process all segments in the contour */
      do
      {
        /* first, extend current segment's end whenever possible */
        after = end;
        do
        {
          do
          {
            end   = after;
            after = after->next;
            if ( after == first )
              finished = 1;
 
            out_x = after->org_u - end->org_u;
            out_y = after->org_v - end->org_v;
 
          } while ( out_x == 0 && out_y == 0 );
 
          orient_cur = psh_corner_orientation( in_x, in_y, out_x, out_y );
 
        } while ( orient_cur == 0 );
 
        if ( ( orient_cur ^ orient_prev ) < 0 )
        {
          do
          {
            psh_point_set_inflex( start );
            start = start->next;
          }
          while ( start != end );
 
          psh_point_set_inflex( start );
        }
 
        start       = end;
        end         = after;
        orient_prev = orient_cur;
        in_x        = out_x;
        in_y        = out_y;
 
      } while ( !finished );
 
    Skip:
      ;
    }
  }

Referenced by psh_glyph_init().

psh_glyph_done()

static void psh_glyph_done ( PSH_Glyph  glyph )

static

Definition at line 1034 of file pshalgo.c.

  {
    FT_Memory  memory = glyph->memory;
 
 
    psh_hint_table_done( &glyph->hint_tables[1], memory );
    psh_hint_table_done( &glyph->hint_tables[0], memory );
 
    FT_FREE( glyph->points );
    FT_FREE( glyph->contours );
 
    glyph->num_points   = 0;
    glyph->num_contours = 0;
 
    glyph->memory = NULL;
  }

Referenced by ps_hints_apply().

psh_glyph_find_blue_points()

static void psh_glyph_find_blue_points ( PSH_Blues  blues, PSH_Glyph  glyph  )

static

Definition at line 1643 of file pshalgo.c.

  {
    PSH_Blue_Table  table;
    PSH_Blue_Zone   zone;
    FT_UInt         glyph_count = glyph->num_points;
    FT_UInt         blue_count;
    PSH_Point       point = glyph->points;
 
 
    for ( ; glyph_count > 0; glyph_count--, point++ )
    {
      FT_Pos  y;
 
 
      /* check tangents */
      if ( !PSH_DIR_COMPARE( point->dir_in,  PSH_DIR_HORIZONTAL ) &&
           !PSH_DIR_COMPARE( point->dir_out, PSH_DIR_HORIZONTAL ) )
        continue;
 
      /* skip strong points */
      if ( psh_point_is_strong( point ) )
        continue;
 
      y = point->org_u;
 
      /* look up top zones */
      table      = &blues->normal_top;
      blue_count = table->count;
      zone       = table->zones;
 
      for ( ; blue_count > 0; blue_count--, zone++ )
      {
        FT_Pos  delta = y - zone->org_bottom;
 
 
        if ( delta < -blues->blue_fuzz )
          break;
 
        if ( y <= zone->org_top + blues->blue_fuzz )
          if ( blues->no_overshoots || delta <= blues->blue_threshold )
          {
            point->cur_u = zone->cur_bottom;
            psh_point_set_strong( point );
            psh_point_set_fitted( point );
          }
      }
 
      /* look up bottom zones */
      table      = &blues->normal_bottom;
      blue_count = table->count;
      zone       = table->zones + blue_count - 1;
 
      for ( ; blue_count > 0; blue_count--, zone-- )
      {
        FT_Pos  delta = zone->org_top - y;
 
 
        if ( delta < -blues->blue_fuzz )
          break;
 
        if ( y >= zone->org_bottom - blues->blue_fuzz )
          if ( blues->no_overshoots || delta < blues->blue_threshold )
          {
            point->cur_u = zone->cur_top;
            psh_point_set_strong( point );
            psh_point_set_fitted( point );
          }
      }
    }
  }

Referenced by ps_hints_apply().

psh_glyph_find_strong_points()

static void psh_glyph_find_strong_points ( PSH_Glyph  glyph, FT_Int  dimension  )

static

Definition at line 1564 of file pshalgo.c.

  {
    /* a point is `strong' if it is located on a stem edge and       */
    /* has an `in' or `out' tangent parallel to the hint's direction */
 
    PSH_Hint_Table  table     = &glyph->hint_tables[dimension];
    PS_Mask         mask      = table->hint_masks->masks;
    FT_UInt         num_masks = table->hint_masks->num_masks;
    FT_UInt         first     = 0;
    FT_Int          major_dir = ( dimension == 0 ) ? PSH_DIR_VERTICAL
                                                   : PSH_DIR_HORIZONTAL;
    PSH_Dimension   dim       = &glyph->globals->dimension[dimension];
    FT_Fixed        scale     = dim->scale_mult;
    FT_Int          threshold;
 
 
    threshold = (FT_Int)FT_DivFix( PSH_STRONG_THRESHOLD, scale );
    if ( threshold > PSH_STRONG_THRESHOLD_MAXIMUM )
      threshold = PSH_STRONG_THRESHOLD_MAXIMUM;
 
    /* process secondary hints to `selected' points */
    if ( num_masks > 1 && glyph->num_points > 0 )
    {
      /* the `endchar' op can reduce the number of points */
      first = mask->end_point > glyph->num_points
                ? glyph->num_points
                : mask->end_point;
      mask++;
      for ( ; num_masks > 1; num_masks--, mask++ )
      {
        FT_UInt  next = FT_MIN( mask->end_point, glyph->num_points );
 
 
        if ( next > first )
        {
          FT_UInt    count = next - first;
          PSH_Point  point = glyph->points + first;
 
 
          psh_hint_table_activate_mask( table, mask );
 
          psh_hint_table_find_strong_points( table, point, count,
                                             threshold, major_dir );
        }
        first = next;
      }
    }
 
    /* process primary hints for all points */
    if ( num_masks == 1 )
    {
      FT_UInt    count = glyph->num_points;
      PSH_Point  point = glyph->points;
 
 
      psh_hint_table_activate_mask( table, table->hint_masks->masks );
 
      psh_hint_table_find_strong_points( table, point, count,
                                         threshold, major_dir );
    }
 
    /* now, certain points may have been attached to a hint and */
    /* not marked as strong; update their flags then            */
    {
      FT_UInt    count = glyph->num_points;
      PSH_Point  point = glyph->points;
 
 
      for ( ; count > 0; count--, point++ )
        if ( point->hint && !psh_point_is_strong( point ) )
          psh_point_set_strong( point );
    }
  }

Referenced by ps_hints_apply().

psh_glyph_init()

static FT_Error psh_glyph_init ( PSH_Glyph  glyph, FT_Outline *  outline, PS_Hints  ps_hints, PSH_Globals  globals  )

static

Definition at line 1154 of file pshalgo.c.

  {
    FT_Error   error;
    FT_Memory  memory;
 
 
    /* clear all fields */
    FT_ZERO( glyph );
 
    memory = glyph->memory = globals->memory;
 
    /* allocate and setup points + contours arrays */
    if ( FT_NEW_ARRAY( glyph->points,   outline->n_points   ) ||
         FT_NEW_ARRAY( glyph->contours, outline->n_contours ) )
      goto Exit;
 
    glyph->num_points   = (FT_UInt)outline->n_points;
    glyph->num_contours = (FT_UInt)outline->n_contours;
 
    {
      FT_UInt      first = 0, next, n;
      PSH_Point    points  = glyph->points;
      PSH_Contour  contour = glyph->contours;
 
 
      for ( n = 0; n < glyph->num_contours; n++ )
      {
        FT_UInt    count;
        PSH_Point  point;
 
 
        next  = (FT_UInt)outline->contours[n] + 1;
        count = next - first;
 
        contour->start = points + first;
        contour->count = count;
 
        if ( count > 0 )
        {
          point = points + first;
 
          point->prev    = points + next - 1;
          point->contour = contour;
 
          for ( ; count > 1; count-- )
          {
            point[0].next = point + 1;
            point[1].prev = point;
            point++;
            point->contour = contour;
          }
          point->next = points + first;
        }
 
        contour++;
        first = next;
      }
    }
 
    {
      PSH_Point   points = glyph->points;
      PSH_Point   point  = points;
      FT_Vector*  vec    = outline->points;
      FT_UInt     n;
 
 
      for ( n = 0; n < glyph->num_points; n++, point++ )
      {
        FT_Int  n_prev = (FT_Int)( point->prev - points );
        FT_Int  n_next = (FT_Int)( point->next - points );
        FT_Pos  dxi, dyi, dxo, dyo;
 
 
        if ( !( outline->tags[n] & FT_CURVE_TAG_ON ) )
          point->flags = PSH_POINT_OFF;
 
        dxi = vec[n].x - vec[n_prev].x;
        dyi = vec[n].y - vec[n_prev].y;
 
        point->dir_in = (FT_Char)psh_compute_dir( dxi, dyi );
 
        dxo = vec[n_next].x - vec[n].x;
        dyo = vec[n_next].y - vec[n].y;
 
        point->dir_out = (FT_Char)psh_compute_dir( dxo, dyo );
 
        /* detect smooth points */
        if ( point->flags & PSH_POINT_OFF )
          point->flags |= PSH_POINT_SMOOTH;
 
        else if ( point->dir_in == point->dir_out )
        {
          if ( point->dir_out != PSH_DIR_NONE           ||
               psh_corner_is_flat( dxi, dyi, dxo, dyo ) )
            point->flags |= PSH_POINT_SMOOTH;
        }
      }
    }
 
    glyph->outline = outline;
    glyph->globals = globals;
 
#ifdef COMPUTE_INFLEXS
    psh_glyph_load_points( glyph, 0 );
    psh_glyph_compute_inflections( glyph );
#endif /* COMPUTE_INFLEXS */
 
    /* now deal with hints tables */
    error = psh_hint_table_init( &glyph->hint_tables [0],
                                 &ps_hints->dimension[0].hints,
                                 &ps_hints->dimension[0].masks,
                                 &ps_hints->dimension[0].counters,
                                 memory );
    if ( error )
      goto Exit;
 
    error = psh_hint_table_init( &glyph->hint_tables [1],
                                 &ps_hints->dimension[1].hints,
                                 &ps_hints->dimension[1].masks,
                                 &ps_hints->dimension[1].counters,
                                 memory );
    if ( error )
      goto Exit;
 
  Exit:
    return error;
  }

Referenced by ps_hints_apply().

psh_glyph_interpolate_normal_points()

static void psh_glyph_interpolate_normal_points ( PSH_Glyph  glyph, FT_Int  dimension  )

static

Definition at line 1769 of file pshalgo.c.

  {
 
#if 1
    /* first technique: a point is strong if it is a local extremum */
 
    PSH_Dimension  dim    = &glyph->globals->dimension[dimension];
    FT_Fixed       scale  = dim->scale_mult;
    FT_Memory      memory = glyph->memory;
 
    PSH_Point*     strongs     = NULL;
    PSH_Point      strongs_0[PSH_MAX_STRONG_INTERNAL];
    FT_UInt        num_strongs = 0;
 
    PSH_Point      points = glyph->points;
    PSH_Point      points_end = points + glyph->num_points;
    PSH_Point      point;
 
 
    /* first count the number of strong points */
    for ( point = points; point < points_end; point++ )
    {
      if ( psh_point_is_strong( point ) )
        num_strongs++;
    }
 
    if ( num_strongs == 0 )  /* nothing to do here */
      return;
 
    /* allocate an array to store a list of points, */
    /* stored in increasing org_u order             */
    if ( num_strongs <= PSH_MAX_STRONG_INTERNAL )
      strongs = strongs_0;
    else
    {
      FT_Error  error;
 
 
      if ( FT_NEW_ARRAY( strongs, num_strongs ) )
        return;
    }
 
    num_strongs = 0;
    for ( point = points; point < points_end; point++ )
    {
      PSH_Point*  insert;
 
 
      if ( !psh_point_is_strong( point ) )
        continue;
 
      for ( insert = strongs + num_strongs; insert > strongs; insert-- )
      {
        if ( insert[-1]->org_u <= point->org_u )
          break;
 
        insert[0] = insert[-1];
      }
      insert[0] = point;
      num_strongs++;
    }
 
    /* now try to interpolate all normal points */
    for ( point = points; point < points_end; point++ )
    {
      if ( psh_point_is_strong( point ) )
        continue;
 
      /* sometimes, some local extrema are smooth points */
      if ( psh_point_is_smooth( point ) )
      {
        if ( point->dir_in == PSH_DIR_NONE   ||
             point->dir_in != point->dir_out )
          continue;
 
        if ( !psh_point_is_extremum( point ) &&
             !psh_point_is_inflex( point )   )
          continue;
 
        point->flags &= ~PSH_POINT_SMOOTH;
      }
 
      /* find best enclosing point coordinates then interpolate */
      {
        PSH_Point   before, after;
        FT_UInt     nn;
 
 
        for ( nn = 0; nn < num_strongs; nn++ )
          if ( strongs[nn]->org_u > point->org_u )
            break;
 
        if ( nn == 0 )  /* point before the first strong point */
        {
          after = strongs[0];
 
          point->cur_u = after->cur_u +
                           FT_MulFix( point->org_u - after->org_u,
                                      scale );
        }
        else
        {
          before = strongs[nn - 1];
 
          for ( nn = num_strongs; nn > 0; nn-- )
            if ( strongs[nn - 1]->org_u < point->org_u )
              break;
 
          if ( nn == num_strongs )  /* point is after last strong point */
          {
            before = strongs[nn - 1];
 
            point->cur_u = before->cur_u +
                             FT_MulFix( point->org_u - before->org_u,
                                        scale );
          }
          else
          {
            FT_Pos  u;
 
 
            after = strongs[nn];
 
            /* now interpolate point between before and after */
            u = point->org_u;
 
            if ( u == before->org_u )
              point->cur_u = before->cur_u;
 
            else if ( u == after->org_u )
              point->cur_u = after->cur_u;
 
            else
              point->cur_u = before->cur_u +
                               FT_MulDiv( u - before->org_u,
                                          after->cur_u - before->cur_u,
                                          after->org_u - before->org_u );
          }
        }
        psh_point_set_fitted( point );
      }
    }
 
    if ( strongs != strongs_0 )
      FT_FREE( strongs );
 
#endif /* 1 */
 
  }

Referenced by ps_hints_apply().

psh_glyph_interpolate_other_points()

static void psh_glyph_interpolate_other_points ( PSH_Glyph  glyph, FT_Int  dimension  )

static

Definition at line 1923 of file pshalgo.c.

  {
    PSH_Dimension  dim          = &glyph->globals->dimension[dimension];
    FT_Fixed       scale        = dim->scale_mult;
    FT_Fixed       delta        = dim->scale_delta;
    PSH_Contour    contour      = glyph->contours;
    FT_UInt        num_contours = glyph->num_contours;
 
 
    for ( ; num_contours > 0; num_contours--, contour++ )
    {
      PSH_Point  start = contour->start;
      PSH_Point  first, next, point;
      FT_UInt    fit_count;
 
 
      /* count the number of strong points in this contour */
      next      = start + contour->count;
      fit_count = 0;
      first     = NULL;
 
      for ( point = start; point < next; point++ )
        if ( psh_point_is_fitted( point ) )
        {
          if ( !first )
            first = point;
 
          fit_count++;
        }
 
      /* if there are less than 2 fitted points in the contour, we */
      /* simply scale and eventually translate the contour points  */
      if ( fit_count < 2 )
      {
        if ( fit_count == 1 )
          delta = first->cur_u - FT_MulFix( first->org_u, scale );
 
        for ( point = start; point < next; point++ )
          if ( point != first )
            point->cur_u = FT_MulFix( point->org_u, scale ) + delta;
 
        goto Next_Contour;
      }
 
      /* there are more than 2 strong points in this contour; we */
      /* need to interpolate weak points between them            */
      start = first;
      do
      {
        /* skip consecutive fitted points */
        for (;;)
        {
          next = first->next;
          if ( next == start )
            goto Next_Contour;
 
          if ( !psh_point_is_fitted( next ) )
            break;
 
          first = next;
        }
 
        /* find next fitted point after unfitted one */
        for (;;)
        {
          next = next->next;
          if ( psh_point_is_fitted( next ) )
            break;
        }
 
        /* now interpolate between them */
        {
          FT_Pos    org_a, org_ab, cur_a, cur_ab;
          FT_Pos    org_c, org_ac, cur_c;
          FT_Fixed  scale_ab;
 
 
          if ( first->org_u <= next->org_u )
          {
            org_a  = first->org_u;
            cur_a  = first->cur_u;
            org_ab = next->org_u - org_a;
            cur_ab = next->cur_u - cur_a;
          }
          else
          {
            org_a  = next->org_u;
            cur_a  = next->cur_u;
            org_ab = first->org_u - org_a;
            cur_ab = first->cur_u - cur_a;
          }
 
          scale_ab = 0x10000L;
          if ( org_ab > 0 )
            scale_ab = FT_DivFix( cur_ab, org_ab );
 
          point = first->next;
          do
          {
            org_c  = point->org_u;
            org_ac = org_c - org_a;
 
            if ( org_ac <= 0 )
            {
              /* on the left of the interpolation zone */
              cur_c = cur_a + FT_MulFix( org_ac, scale );
            }
            else if ( org_ac >= org_ab )
            {
              /* on the right on the interpolation zone */
              cur_c = cur_a + cur_ab + FT_MulFix( org_ac - org_ab, scale );
            }
            else
            {
              /* within the interpolation zone */
              cur_c = cur_a + FT_MulFix( org_ac, scale_ab );
            }
 
            point->cur_u = cur_c;
 
            point = point->next;
 
          } while ( point != next );
        }
 
        /* keep going until all points in the contours have been processed */
        first = next;
 
      } while ( first != start );
 
    Next_Contour:
      ;
    }
  }

Referenced by ps_hints_apply().

psh_glyph_interpolate_strong_points()

static void psh_glyph_interpolate_strong_points ( PSH_Glyph  glyph, FT_Int  dimension  )

static

Definition at line 1718 of file pshalgo.c.

  {
    PSH_Dimension  dim   = &glyph->globals->dimension[dimension];
    FT_Fixed       scale = dim->scale_mult;
 
    FT_UInt        count = glyph->num_points;
    PSH_Point      point = glyph->points;
 
 
    for ( ; count > 0; count--, point++ )
    {
      PSH_Hint  hint = point->hint;
 
 
      if ( hint )
      {
        FT_Pos  delta;
 
 
        if ( psh_point_is_edge_min( point ) )
          point->cur_u = hint->cur_pos;
 
        else if ( psh_point_is_edge_max( point ) )
          point->cur_u = hint->cur_pos + hint->cur_len;
 
        else
        {
          delta = point->org_u - hint->org_pos;
 
          if ( delta <= 0 )
            point->cur_u = hint->cur_pos + FT_MulFix( delta, scale );
 
          else if ( delta >= hint->org_len )
            point->cur_u = hint->cur_pos + hint->cur_len +
                             FT_MulFix( delta - hint->org_len, scale );
 
          else /* hint->org_len > 0 */
            point->cur_u = hint->cur_pos +
                             FT_MulDiv( delta, hint->cur_len,
                                        hint->org_len );
        }
        psh_point_set_fitted( point );
      }
    }
  }

Referenced by ps_hints_apply().

psh_glyph_load_points()

static void psh_glyph_load_points ( PSH_Glyph  glyph, FT_Int  dimension  )

static

Definition at line 1080 of file pshalgo.c.

  {
    FT_Vector*  vec   = glyph->outline->points;
    PSH_Point   point = glyph->points;
    FT_UInt     count = glyph->num_points;
 
 
    for ( ; count > 0; count--, point++, vec++ )
    {
      point->flags2 = 0;
      point->hint   = NULL;
      if ( dimension == 0 )
      {
        point->org_u = vec->x;
        point->org_v = vec->y;
      }
      else
      {
        point->org_u = vec->y;
        point->org_v = vec->x;
      }
 
#ifdef DEBUG_HINTER
      point->org_x = vec->x;
      point->org_y = vec->y;
#endif
 
    }
  }

Referenced by ps_hints_apply(), and psh_glyph_init().

psh_glyph_save_points()

static void psh_glyph_save_points ( PSH_Glyph  glyph, FT_Int  dimension  )

static

Definition at line 1114 of file pshalgo.c.

  {
    FT_UInt     n;
    PSH_Point   point = glyph->points;
    FT_Vector*  vec   = glyph->outline->points;
    char*       tags  = glyph->outline->tags;
 
 
    for ( n = 0; n < glyph->num_points; n++ )
    {
      if ( dimension == 0 )
        vec[n].x = point->cur_u;
      else
        vec[n].y = point->cur_u;
 
      if ( psh_point_is_strong( point ) )
        tags[n] |= (char)( ( dimension == 0 ) ? 32 : 64 );
 
#ifdef DEBUG_HINTER
 
      if ( dimension == 0 )
      {
        point->cur_x   = point->cur_u;
        point->flags_x = point->flags2 | point->flags;
      }
      else
      {
        point->cur_y   = point->cur_u;
        point->flags_y = point->flags2 | point->flags;
      }
 
#endif
 
      point++;
    }
  }

Referenced by ps_hints_apply().

psh_hint_align()

static void psh_hint_align ( PSH_Hint  hint, PSH_Globals  globals, FT_Int  dimension, PSH_Glyph  glyph  )

static

Definition at line 436 of file pshalgo.c.

  {
    PSH_Dimension  dim   = &globals->dimension[dimension];
    FT_Fixed       scale = dim->scale_mult;
    FT_Fixed       delta = dim->scale_delta;
 
 
    if ( !psh_hint_is_fitted( hint ) )
    {
      FT_Pos  pos = FT_MulFix( hint->org_pos, scale ) + delta;
      FT_Pos  len = FT_MulFix( hint->org_len, scale );
 
      FT_Int            do_snapping;
      FT_Pos            fit_len;
      PSH_AlignmentRec  align;
 
 
      /* ignore stem alignments when requested through the hint flags */
      if ( ( dimension == 0 && !glyph->do_horz_hints ) ||
           ( dimension == 1 && !glyph->do_vert_hints ) )
      {
        hint->cur_pos = pos;
        hint->cur_len = len;
 
        psh_hint_set_fitted( hint );
        return;
      }
 
      /* perform stem snapping when requested - this is necessary
       * for monochrome and LCD hinting modes only
       */
      do_snapping = ( dimension == 0 && glyph->do_horz_snapping ) ||
                    ( dimension == 1 && glyph->do_vert_snapping );
 
      hint->cur_len = fit_len = len;
 
      /* check blue zones for horizontal stems */
      align.align     = PSH_BLUE_ALIGN_NONE;
      align.align_bot = align.align_top = 0;
 
      if ( dimension == 1 )
        psh_blues_snap_stem( &globals->blues,
                             ADD_INT( hint->org_pos, hint->org_len ),
                             hint->org_pos,
                             &align );
 
      switch ( align.align )
      {
      case PSH_BLUE_ALIGN_TOP:
        /* the top of the stem is aligned against a blue zone */
        hint->cur_pos = align.align_top - fit_len;
        break;
 
      case PSH_BLUE_ALIGN_BOT:
        /* the bottom of the stem is aligned against a blue zone */
        hint->cur_pos = align.align_bot;
        break;
 
      case PSH_BLUE_ALIGN_TOP | PSH_BLUE_ALIGN_BOT:
        /* both edges of the stem are aligned against blue zones */
        hint->cur_pos = align.align_bot;
        hint->cur_len = align.align_top - align.align_bot;
        break;
 
      default:
        {
          PSH_Hint  parent = hint->parent;
 
 
          if ( parent )
          {
            FT_Pos  par_org_center, par_cur_center;
            FT_Pos  cur_org_center, cur_delta;
 
 
            /* ensure that parent is already fitted */
            if ( !psh_hint_is_fitted( parent ) )
              psh_hint_align( parent, globals, dimension, glyph );
 
            /* keep original relation between hints, this is, use the */
            /* scaled distance between the centers of the hints to    */
            /* compute the new position                               */
            par_org_center = parent->org_pos + ( parent->org_len >> 1 );
            par_cur_center = parent->cur_pos + ( parent->cur_len >> 1 );
            cur_org_center = hint->org_pos   + ( hint->org_len   >> 1 );
 
            cur_delta = FT_MulFix( cur_org_center - par_org_center, scale );
            pos       = par_cur_center + cur_delta - ( len >> 1 );
          }
 
          hint->cur_pos = pos;
          hint->cur_len = fit_len;
 
          /* Stem adjustment tries to snap stem widths to standard
           * ones.  This is important to prevent unpleasant rounding
           * artefacts.
           */
          if ( glyph->do_stem_adjust )
          {
            if ( len <= 64 )
            {
              /* the stem is less than one pixel; we will center it
               * around the nearest pixel center
               */
              if ( len >= 32 )
              {
                /* This is a special case where we also widen the stem
                 * and align it to the pixel grid.
                 *
                 *   stem_center          = pos + (len/2)
                 *   nearest_pixel_center = FT_ROUND(stem_center-32)+32
                 *   new_pos              = nearest_pixel_center-32
                 *                        = FT_ROUND(stem_center-32)
                 *                        = FT_FLOOR(stem_center-32+32)
                 *                        = FT_FLOOR(stem_center)
                 *   new_len              = 64
                 */
                pos = FT_PIX_FLOOR( pos + ( len >> 1 ) );
                len = 64;
              }
              else if ( len > 0 )
              {
                /* This is a very small stem; we simply align it to the
                 * pixel grid, trying to find the minimum displacement.
                 *
                 * left               = pos
                 * right              = pos + len
                 * left_nearest_edge  = ROUND(pos)
                 * right_nearest_edge = ROUND(right)
                 *
                 * if ( ABS(left_nearest_edge - left) <=
                 *      ABS(right_nearest_edge - right) )
                 *    new_pos = left
                 * else
                 *    new_pos = right
                 */
                FT_Pos  left_nearest  = FT_PIX_ROUND( pos );
                FT_Pos  right_nearest = FT_PIX_ROUND( pos + len );
                FT_Pos  left_disp     = left_nearest - pos;
                FT_Pos  right_disp    = right_nearest - ( pos + len );
 
 
                if ( left_disp < 0 )
                  left_disp = -left_disp;
                if ( right_disp < 0 )
                  right_disp = -right_disp;
                if ( left_disp <= right_disp )
                  pos = left_nearest;
                else
                  pos = right_nearest;
              }
              else
              {
                /* this is a ghost stem; we simply round it */
                pos = FT_PIX_ROUND( pos );
              }
            }
            else
            {
              len = psh_dimension_quantize_len( dim, len, 0 );
            }
          }
 
          /* now that we have a good hinted stem width, try to position */
          /* the stem along a pixel grid integer coordinate             */
          hint->cur_pos = pos + psh_hint_snap_stem_side_delta( pos, len );
          hint->cur_len = len;
        }
      }
 
      if ( do_snapping )
      {
        pos = hint->cur_pos;
        len = hint->cur_len;
 
        if ( len < 64 )
          len = 64;
        else
          len = FT_PIX_ROUND( len );
 
        switch ( align.align )
        {
          case PSH_BLUE_ALIGN_TOP:
            hint->cur_pos = align.align_top - len;
            hint->cur_len = len;
            break;
 
          case PSH_BLUE_ALIGN_BOT:
            hint->cur_len = len;
            break;
 
          case PSH_BLUE_ALIGN_BOT | PSH_BLUE_ALIGN_TOP:
            /* don't touch */
            break;
 
 
          default:
            hint->cur_len = len;
            if ( len & 64 )
              pos = FT_PIX_FLOOR( pos + ( len >> 1 ) ) + 32;
            else
              pos = FT_PIX_ROUND( pos + ( len >> 1 ) );
 
            hint->cur_pos = pos - ( len >> 1 );
            hint->cur_len = len;
        }
      }
 
      psh_hint_set_fitted( hint );
 
#ifdef DEBUG_HINTER
      if ( ps_debug_hint_func )
        ps_debug_hint_func( hint, dimension );
#endif
    }
  }

Referenced by psh_hint_align(), and psh_hint_table_align_hints().

psh_hint_overlap()

static FT_Int psh_hint_overlap ( PSH_Hint  hint1, PSH_Hint  hint2  )

static

Definition at line 52 of file pshalgo.c.

  {
    return ADD_INT( hint1->org_pos, hint1->org_len ) >= hint2->org_pos &&
           ADD_INT( hint2->org_pos, hint2->org_len ) >= hint1->org_pos;
  }

Referenced by psh_hint_table_activate_mask(), and psh_hint_table_record().

psh_hint_snap_stem_side_delta()

static FT_Fixed psh_hint_snap_stem_side_delta ( FT_Fixed  pos, FT_Fixed  len  )

static

Definition at line 421 of file pshalgo.c.

  {
    FT_Fixed  delta1 = FT_PIX_ROUND( pos ) - pos;
    FT_Fixed  delta2 = FT_PIX_ROUND( pos + len ) - pos - len;
 
 
    if ( FT_ABS( delta1 ) <= FT_ABS( delta2 ) )
      return delta1;
    else
      return delta2;
  }

Referenced by psh_hint_align().

psh_hint_table_activate_mask()

static void psh_hint_table_activate_mask ( PSH_Hint_Table  table, PS_Mask  hint_mask  )

static

Definition at line 243 of file pshalgo.c.

  {
    FT_Int    mask = 0, val = 0;
    FT_Byte*  cursor = hint_mask->bytes;
    FT_UInt   idx, limit, count;
 
 
    limit = hint_mask->num_bits;
    count = 0;
 
    psh_hint_table_deactivate( table );
 
    for ( idx = 0; idx < limit; idx++ )
    {
      if ( mask == 0 )
      {
        val  = *cursor++;
        mask = 0x80;
      }
 
      if ( val & mask )
      {
        PSH_Hint  hint = &table->hints[idx];
 
 
        if ( !psh_hint_is_active( hint ) )
        {
          FT_UInt     count2;
 
#if 0
          PSH_Hint*  sort = table->sort;
          PSH_Hint   hint2;
 
 
          for ( count2 = count; count2 > 0; count2--, sort++ )
          {
            hint2 = sort[0];
            if ( psh_hint_overlap( hint, hint2 ) )
              FT_TRACE0(( "psh_hint_table_activate_mask:"
                          " found overlapping hints\n" ))
          }
#else
          count2 = 0;
#endif
 
          if ( count2 == 0 )
          {
            psh_hint_activate( hint );
            if ( count < table->max_hints )
              table->sort[count++] = hint;
            else
              FT_TRACE0(( "psh_hint_tableactivate_mask:"
                          " too many active hints\n" ));
          }
        }
      }
 
      mask >>= 1;
    }
    table->num_hints = count;
 
    /* now, sort the hints; they are guaranteed to not overlap */
    /* so we can compare their "org_pos" field directly        */
    {
      FT_Int     i1, i2;
      PSH_Hint   hint1, hint2;
      PSH_Hint*  sort = table->sort;
 
 
      /* a simple bubble sort will do, since in 99% of cases, the hints */
      /* will be already sorted -- and the sort will be linear          */
      for ( i1 = 1; i1 < (FT_Int)count; i1++ )
      {
        hint1 = sort[i1];
        for ( i2 = i1 - 1; i2 >= 0; i2-- )
        {
          hint2 = sort[i2];
 
          if ( hint2->org_pos < hint1->org_pos )
            break;
 
          sort[i2 + 1] = hint2;
          sort[i2]     = hint1;
        }
      }
    }
  }

Referenced by psh_glyph_find_strong_points().

psh_hint_table_align_hints()

static void psh_hint_table_align_hints ( PSH_Hint_Table  table, PSH_Globals  globals, FT_Int  dimension, PSH_Glyph  glyph  )

static

Definition at line 845 of file pshalgo.c.

  {
    PSH_Hint       hint;
    FT_UInt        count;
 
#ifdef DEBUG_HINTER
 
    PSH_Dimension  dim   = &globals->dimension[dimension];
    FT_Fixed       scale = dim->scale_mult;
    FT_Fixed       delta = dim->scale_delta;
 
 
    if ( ps_debug_no_vert_hints && dimension == 0 )
    {
      ps_simple_scale( table, scale, delta, dimension );
      return;
    }
 
    if ( ps_debug_no_horz_hints && dimension == 1 )
    {
      ps_simple_scale( table, scale, delta, dimension );
      return;
    }
 
#endif /* DEBUG_HINTER*/
 
    hint  = table->hints;
    count = table->max_hints;
 
    for ( ; count > 0; count--, hint++ )
      psh_hint_align( hint, globals, dimension, glyph );
  }

Referenced by ps_hints_apply().

psh_hint_table_deactivate()

static void psh_hint_table_deactivate ( PSH_Hint_Table  table )

static

Definition at line 79 of file pshalgo.c.

  {
    FT_UInt   count = table->max_hints;
    PSH_Hint  hint  = table->hints;
 
 
    for ( ; count > 0; count--, hint++ )
    {
      psh_hint_deactivate( hint );
      hint->order = -1;
    }
  }

Referenced by psh_hint_table_activate_mask().

psh_hint_table_done()

static void psh_hint_table_done ( PSH_Hint_Table  table, FT_Memory  memory  )

static

Definition at line 62 of file pshalgo.c.

  {
    FT_FREE( table->zones );
    table->num_zones = 0;
    table->zone      = NULL;
 
    FT_FREE( table->sort );
    FT_FREE( table->hints );
    table->num_hints   = 0;
    table->max_hints   = 0;
    table->sort_global = NULL;
  }

Referenced by psh_glyph_done().

psh_hint_table_find_strong_points()

static void psh_hint_table_find_strong_points ( PSH_Hint_Table  table, PSH_Point  point, FT_UInt  count, FT_Int  threshold, FT_Int  major_dir  )

static

Definition at line 1411 of file pshalgo.c.

  {
    PSH_Hint*  sort      = table->sort;
    FT_UInt    num_hints = table->num_hints;
 
 
    for ( ; count > 0; count--, point++ )
    {
      FT_Int  point_dir = 0;
      FT_Pos  org_u     = point->org_u;
 
 
      if ( psh_point_is_strong( point ) )
        continue;
 
      if ( PSH_DIR_COMPARE( point->dir_in, major_dir ) )
        point_dir = point->dir_in;
 
      else if ( PSH_DIR_COMPARE( point->dir_out, major_dir ) )
        point_dir = point->dir_out;
 
      if ( point_dir )
      {
        if ( point_dir == major_dir )
        {
          FT_UInt  nn;
 
 
          for ( nn = 0; nn < num_hints; nn++ )
          {
            PSH_Hint  hint = sort[nn];
            FT_Pos    d    = org_u - hint->org_pos;
 
 
            if ( d < threshold && -d < threshold )
            {
              psh_point_set_strong( point );
              point->flags2 |= PSH_POINT_EDGE_MIN;
              point->hint    = hint;
              break;
            }
          }
        }
        else if ( point_dir == -major_dir )
        {
          FT_UInt  nn;
 
 
          for ( nn = 0; nn < num_hints; nn++ )
          {
            PSH_Hint  hint = sort[nn];
            FT_Pos    d    = org_u - hint->org_pos - hint->org_len;
 
 
            if ( d < threshold && -d < threshold )
            {
              psh_point_set_strong( point );
              point->flags2 |= PSH_POINT_EDGE_MAX;
              point->hint    = hint;
              break;
            }
          }
        }
      }
 
#if 1
      else if ( psh_point_is_extremum( point ) )
      {
        /* treat extrema as special cases for stem edge alignment */
        FT_UInt  nn, min_flag, max_flag;
 
 
        if ( major_dir == PSH_DIR_HORIZONTAL )
        {
          min_flag = PSH_POINT_POSITIVE;
          max_flag = PSH_POINT_NEGATIVE;
        }
        else
        {
          min_flag = PSH_POINT_NEGATIVE;
          max_flag = PSH_POINT_POSITIVE;
        }
 
        if ( point->flags2 & min_flag )
        {
          for ( nn = 0; nn < num_hints; nn++ )
          {
            PSH_Hint  hint = sort[nn];
            FT_Pos    d    = org_u - hint->org_pos;
 
 
            if ( d < threshold && -d < threshold )
            {
              point->flags2 |= PSH_POINT_EDGE_MIN;
              point->hint    = hint;
              psh_point_set_strong( point );
              break;
            }
          }
        }
        else if ( point->flags2 & max_flag )
        {
          for ( nn = 0; nn < num_hints; nn++ )
          {
            PSH_Hint  hint = sort[nn];
            FT_Pos    d    = org_u - hint->org_pos - hint->org_len;
 
 
            if ( d < threshold && -d < threshold )
            {
              point->flags2 |= PSH_POINT_EDGE_MAX;
              point->hint    = hint;
              psh_point_set_strong( point );
              break;
            }
          }
        }
 
        if ( !point->hint )
        {
          for ( nn = 0; nn < num_hints; nn++ )
          {
            PSH_Hint  hint = sort[nn];
 
 
            if ( org_u >=          hint->org_pos                  &&
                 org_u <= ADD_INT( hint->org_pos, hint->org_len ) )
            {
              point->hint = hint;
              break;
            }
          }
        }
      }
 
#endif /* 1 */
    }
  }

Referenced by psh_glyph_find_strong_points().

psh_hint_table_init()

static FT_Error psh_hint_table_init ( PSH_Hint_Table  table, PS_Hint_Table  hints, PS_Mask_Table  hint_masks, PS_Mask_Table  counter_masks, FT_Memory  memory  )

static

Definition at line 170 of file pshalgo.c.

  {
    FT_UInt   count;
    FT_Error  error;
 
    FT_UNUSED( counter_masks );
 
 
    count = hints->num_hints;
 
    /* allocate our tables */
    if ( FT_NEW_ARRAY( table->sort,  2 * count     ) ||
         FT_NEW_ARRAY( table->hints,     count     ) ||
         FT_NEW_ARRAY( table->zones, 2 * count + 1 ) )
      goto Exit;
 
    table->max_hints   = count;
    table->sort_global = table->sort + count;
    table->num_hints   = 0;
    table->num_zones   = 0;
    table->zone        = NULL;
 
    /* initialize the `table->hints' array */
    {
      PSH_Hint  write = table->hints;
      PS_Hint   read  = hints->hints;
 
 
      for ( ; count > 0; count--, write++, read++ )
      {
        write->org_pos = read->pos;
        write->org_len = read->len;
        write->flags   = read->flags;
      }
    }
 
    /* we now need to determine the initial `parent' stems; first  */
    /* activate the hints that are given by the initial hint masks */
    if ( hint_masks )
    {
      PS_Mask  mask = hint_masks->masks;
 
 
      count             = hint_masks->num_masks;
      table->hint_masks = hint_masks;
 
      for ( ; count > 0; count--, mask++ )
        psh_hint_table_record_mask( table, mask );
    }
 
    /* finally, do a linear parse in case some hints were left alone */
    if ( table->num_hints != table->max_hints )
    {
      FT_UInt  idx;
 
 
      FT_TRACE0(( "psh_hint_table_init: missing/incorrect hint masks\n" ));
 
      count = table->max_hints;
      for ( idx = 0; idx < count; idx++ )
        psh_hint_table_record( table, idx );
    }
 
  Exit:
    return error;
  }

Referenced by psh_glyph_init().

psh_hint_table_record()

static void psh_hint_table_record ( PSH_Hint_Table  table, FT_UInt  idx  )

static

Definition at line 95 of file pshalgo.c.

  {
    PSH_Hint  hint = table->hints + idx;
 
 
    if ( idx >= table->max_hints )
    {
      FT_TRACE0(( "psh_hint_table_record: invalid hint index %d\n", idx ));
      return;
    }
 
    /* ignore active hints */
    if ( psh_hint_is_active( hint ) )
      return;
 
    psh_hint_activate( hint );
 
    /* now scan the current active hint set to check */
    /* whether `hint' overlaps with another hint     */
    {
      PSH_Hint*  sorted = table->sort_global;
      FT_UInt    count  = table->num_hints;
      PSH_Hint   hint2;
 
 
      hint->parent = NULL;
      for ( ; count > 0; count--, sorted++ )
      {
        hint2 = sorted[0];
 
        if ( psh_hint_overlap( hint, hint2 ) )
        {
          hint->parent = hint2;
          break;
        }
      }
    }
 
    if ( table->num_hints < table->max_hints )
      table->sort_global[table->num_hints++] = hint;
    else
      FT_TRACE0(( "psh_hint_table_record: too many sorted hints!  BUG!\n" ));
  }

Referenced by psh_hint_table_init(), and psh_hint_table_record_mask().

psh_hint_table_record_mask()

static void psh_hint_table_record_mask ( PSH_Hint_Table  table, PS_Mask  hint_mask  )

static

Definition at line 142 of file pshalgo.c.

  {
    FT_Int    mask = 0, val = 0;
    FT_Byte*  cursor = hint_mask->bytes;
    FT_UInt   idx, limit;
 
 
    limit = hint_mask->num_bits;
 
    for ( idx = 0; idx < limit; idx++ )
    {
      if ( mask == 0 )
      {
        val  = *cursor++;
        mask = 0x80;
      }
 
      if ( val & mask )
        psh_hint_table_record( table, idx );
 
      mask >>= 1;
    }
  }

Referenced by psh_hint_table_init().