20060303a

1 files changed, 1757 insertions, 0 deletions

diff --git a/libfreetype/pshalgo3.c b/libfreetype/pshalgo3.c
new file mode 100644
index 00000000..4ee01715
--- /dev/null
+++ b/libfreetype/pshalgo3.c
@@ -0,0 +1,1757 @@
+/***************************************************************************/
+/*                                                                         */
+/*  pshalgo3.c                                                             */
+/*                                                                         */
+/*    PostScript hinting algorithm 3 (body).                               */
+/*                                                                         */
+/*  Copyright 2001, 2002 by                                                */
+/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
+/*                                                                         */
+/*  This file is part of the FreeType project, and may only be used        */
+/*  modified and distributed under the terms of the FreeType project       */
+/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_DEBUG_H
+#include "pshalgo3.h"
+
+
+#undef  FT_COMPONENT
+#define FT_COMPONENT  trace_pshalgo2
+
+
+#ifdef DEBUG_HINTER
+  PSH3_Hint_Table  ps3_debug_hint_table = 0;
+  PSH3_HintFunc    ps3_debug_hint_func  = 0;
+  PSH3_Glyph       ps3_debug_glyph      = 0;
+#endif
+
+
+#define  COMPUTE_INFLEXS  /* compute inflection points to optimize "S" and others */
+#define  STRONGER         /* slightly increase the contrast of smooth hinting */
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****                  BASIC HINTS RECORDINGS                       *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+  /* return true iff two stem hints overlap */
+  static FT_Int
+  psh3_hint_overlap( PSH3_Hint  hint1,
+                     PSH3_Hint  hint2 )
+  {
+    return ( hint1->org_pos + hint1->org_len >= hint2->org_pos &&
+             hint2->org_pos + hint2->org_len >= hint1->org_pos );
+  }
+
+
+  /* destroy hints table */
+  static void
+  psh3_hint_table_done( PSH3_Hint_Table  table,
+                        FT_Memory        memory )
+  {
+    FT_FREE( table->zones );
+    table->num_zones = 0;
+    table->zone      = 0;
+
+    FT_FREE( table->sort );
+    FT_FREE( table->hints );
+    table->num_hints   = 0;
+    table->max_hints   = 0;
+    table->sort_global = 0;
+  }
+
+
+  /* deactivate all hints in a table */
+  static void
+  psh3_hint_table_deactivate( PSH3_Hint_Table  table )
+  {
+    FT_UInt    count = table->max_hints;
+    PSH3_Hint  hint  = table->hints;
+
+
+    for ( ; count > 0; count--, hint++ )
+    {
+      psh3_hint_deactivate( hint );
+      hint->order = -1;
+    }
+  }
+
+
+  /* internal function used to record a new hint */
+  static void
+  psh3_hint_table_record( PSH3_Hint_Table  table,
+                          FT_UInt          idx )
+  {
+    PSH3_Hint  hint = table->hints + idx;
+
+
+    if ( idx >= table->max_hints )
+    {
+      FT_ERROR(( "psh3_hint_table_record: invalid hint index %d\n", idx ));
+      return;
+    }
+
+    /* ignore active hints */
+    if ( psh3_hint_is_active( hint ) )
+      return;
+
+    psh3_hint_activate( hint );
+
+    /* now scan the current active hint set in order to determine */
+    /* if we are overlapping with another segment                 */
+    {
+      PSH3_Hint*  sorted = table->sort_global;
+      FT_UInt     count  = table->num_hints;
+      PSH3_Hint   hint2;
+
+
+      hint->parent = 0;
+      for ( ; count > 0; count--, sorted++ )
+      {
+        hint2 = sorted[0];
+
+        if ( psh3_hint_overlap( hint, hint2 ) )
+        {
+          hint->parent = hint2;
+          break;
+        }
+      }
+    }
+
+    if ( table->num_hints < table->max_hints )
+      table->sort_global[table->num_hints++] = hint;
+    else
+      FT_ERROR(( "psh3_hint_table_record: too many sorted hints!  BUG!\n" ));
+  }
+
+
+  static void
+  psh3_hint_table_record_mask( PSH3_Hint_Table  table,
+                               PS_Mask          hint_mask )
+  {
+    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 )
+        psh3_hint_table_record( table, idx );
+
+      mask >>= 1;
+    }
+  }
+
+
+  /* create hints table */
+  static FT_Error
+  psh3_hint_table_init( PSH3_Hint_Table  table,
+                        PS_Hint_Table    hints,
+                        PS_Mask_Table    hint_masks,
+                        PS_Mask_Table    counter_masks,
+                        FT_Memory        memory )
+  {
+    FT_UInt   count = hints->num_hints;
+    FT_Error  error;
+
+    FT_UNUSED( counter_masks );
+
+
+    /* 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        = 0;
+
+    /* now, initialize the "hints" array */
+    {
+      PSH3_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 )
+    {
+      FT_UInt  Count = hint_masks->num_masks;
+      PS_Mask  Mask  = hint_masks->masks;
+
+
+      table->hint_masks = hint_masks;
+
+      for ( ; Count > 0; Count--, Mask++ )
+        psh3_hint_table_record_mask( table, Mask );
+    }
+
+    /* now, do a linear parse in case some hints were left alone */
+    if ( table->num_hints != table->max_hints )
+    {
+      FT_UInt  Index, Count;
+
+
+      FT_ERROR(( "psh3_hint_table_init: missing/incorrect hint masks!\n" ));
+      Count = table->max_hints;
+      for ( Index = 0; Index < Count; Index++ )
+        psh3_hint_table_record( table, Index );
+    }
+
+  Exit:
+    return error;
+  }
+
+
+  static void
+  psh3_hint_table_activate_mask( PSH3_Hint_Table  table,
+                                 PS_Mask          hint_mask )
+  {
+    FT_Int    mask = 0, val = 0;
+    FT_Byte*  cursor = hint_mask->bytes;
+    FT_UInt   idx, limit, count;
+
+
+    limit = hint_mask->num_bits;
+    count = 0;
+
+    psh3_hint_table_deactivate( table );
+
+    for ( idx = 0; idx < limit; idx++ )
+    {
+      if ( mask == 0 )
+      {
+        val  = *cursor++;
+        mask = 0x80;
+      }
+
+      if ( val & mask )
+      {
+        PSH3_Hint  hint = &table->hints[idx];
+
+
+        if ( !psh3_hint_is_active( hint ) )
+        {
+          FT_UInt     count2;
+
+#if 0
+          PSH3_Hint*  sort = table->sort;
+          PSH3_Hint   hint2;
+
+
+          for ( count2 = count; count2 > 0; count2--, sort++ )
+          {
+            hint2 = sort[0];
+            if ( psh3_hint_overlap( hint, hint2 ) )
+              FT_ERROR(( "psh3_hint_table_activate_mask:"
+                         " found overlapping hints\n" ))
+          }
+#else
+          count2 = 0;
+#endif
+
+          if ( count2 == 0 )
+          {
+            psh3_hint_activate( hint );
+            if ( count < table->max_hints )
+              table->sort[count++] = hint;
+            else
+              FT_ERROR(( "psh3_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;
+      PSH3_Hint   hint1, hint2;
+      PSH3_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;
+        }
+      }
+    }
+  }
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****               HINTS GRID-FITTING AND OPTIMIZATION             *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+  static FT_Pos
+  psh3_dimension_quantize_len( PSH_Dimension  dim,
+                               FT_Pos         len,
+                               FT_Bool        do_snapping )
+  {
+    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 = ( len + 32 ) & -64;
+    }
+
+    if ( do_snapping )
+      len = ( len + 32 ) & -64;
+
+    return  len;
+  }
+
+
+#ifdef DEBUG_HINTER
+
+  static void
+  ps3_simple_scale( PSH3_Hint_Table  table,
+                    FT_Fixed         scale,
+                    FT_Fixed         delta,
+                    FT_Int           dimension )
+  {
+    PSH3_Hint  hint;
+    FT_UInt    count;
+
+
+    for ( count = 0; count < table->max_hints; count++ )
+    {
+      hint = table->hints + count;
+
+      hint->cur_pos = FT_MulFix( hint->org_pos, scale ) + delta;
+      hint->cur_len = FT_MulFix( hint->org_len, scale );
+
+      if ( ps3_debug_hint_func )
+        ps3_debug_hint_func( hint, dimension );
+    }
+  }
+
+#endif /* DEBUG_HINTER */
+
+
+  static FT_Fixed
+  psh3_hint_snap_stem_side_delta( FT_Fixed  pos,
+                                  FT_Fixed  len )
+  {
+    FT_Fixed  delta1 = ( ( pos + 32 ) & -64 ) - pos;
+    FT_Fixed  delta2 = ( ( pos + len + 32 ) & -64  ) - pos - len;
+
+
+    if ( ABS( delta1 ) <= ABS( delta2 ) )
+      return delta1;
+    else
+      return delta2;
+  }
+
+
+  static void
+  psh3_hint_align( PSH3_Hint    hint,
+                   PSH_Globals  globals,
+                   FT_Int       dimension,
+                   PSH3_Glyph   glyph )
+  {
+    PSH_Dimension  dim   = &globals->dimension[dimension];
+    FT_Fixed       scale = dim->scale_mult;
+    FT_Fixed       delta = dim->scale_delta;
+
+
+    if ( !psh3_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;
+
+        psh3_hint_set_fitted( hint );
+        return;
+      }
+
+      /* perform stem snapping when requested */
+      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,
+                             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:
+        {
+          PSH3_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 ( !psh3_hint_is_fitted( parent ) )
+              psh3_hint_align( parent, globals, dimension, glyph );
+
+            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;
+
+          if ( len <= 64 )
+          {
+            /* the stem is less than one pixel, we will center it */
+            /* around the nearest pixel center                    */
+            /*                                                    */
+            pos = ( pos + ( (len >> 1) & -64 ) );
+            len = 64;
+          }
+          else
+          {
+            len = psh3_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 + psh3_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 = ( len + 32 ) & -64;
+
+        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 = ( ( pos + ( len >> 1 ) ) & -64 ) + 32;
+            else
+              pos = ( pos + ( len >> 1 ) + 32 ) & -64;
+
+            hint->cur_pos = pos - ( len >> 1 );
+            hint->cur_len = len;
+        }
+      }
+
+      psh3_hint_set_fitted( hint );
+
+#ifdef DEBUG_HINTER
+      if ( ps3_debug_hint_func )
+        ps3_debug_hint_func( hint, dimension );
+#endif
+    }
+  }
+
+
+  static void
+  psh3_hint_table_align_hints( PSH3_Hint_Table  table,
+                               PSH_Globals      globals,
+                               FT_Int           dimension,
+                               PSH3_Glyph       glyph )
+  {
+    PSH3_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 )
+    {
+      ps3_simple_scale( table, scale, delta, dimension );
+      return;
+    }
+
+    if ( ps_debug_no_horz_hints && dimension == 1 )
+    {
+      ps3_simple_scale( table, scale, delta, dimension );
+      return;
+    }
+
+#endif /* DEBUG_HINTER*/
+
+    hint  = table->hints;
+    count = table->max_hints;
+
+    for ( ; count > 0; count--, hint++ )
+      psh3_hint_align( hint, globals, dimension, glyph );
+  }
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****                POINTS INTERPOLATION ROUTINES                  *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+#define PSH3_ZONE_MIN  -3200000L
+#define PSH3_ZONE_MAX  +3200000L
+
+#define xxDEBUG_ZONES
+
+
+#ifdef DEBUG_ZONES
+
+#include <stdio.h>
+
+  static void
+  psh3_print_zone( PSH3_Zone  zone )
+  {
+    printf( "zone [scale,delta,min,max] = [%.3f,%.3f,%d,%d]\n",
+             zone->scale / 65536.0,
+             zone->delta / 64.0,
+             zone->min,
+             zone->max );
+  }
+
+#else
+
+#define psh3_print_zone( x )  do { } while ( 0 )
+
+#endif /* DEBUG_ZONES */
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****                    HINTER GLYPH MANAGEMENT                    *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+#ifdef COMPUTE_INFLEXS
+
+  /* compute all inflex points in a given glyph */
+  static void
+  psh3_glyph_compute_inflections( PSH3_Glyph  glyph )
+  {
+    FT_UInt  n;
+
+
+    for ( n = 0; n < glyph->num_contours; n++ )
+    {
+      PSH3_Point  first, start, end, before, after;
+      FT_Angle    angle_in, angle_seg, angle_out;
+      FT_Angle    diff_in, diff_out;
+      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;
+
+      } while ( PSH3_POINT_EQUAL_ORG( end, first ) );
+
+      angle_seg = PSH3_POINT_ANGLE( start, end );
+
+      /* extend the segment start whenever possible */
+      before = start;
+      do
+      {
+        do
+        {
+          start  = before;
+          before = before->prev;
+          if ( before == first )
+            goto Skip;
+
+        } while ( PSH3_POINT_EQUAL_ORG( before, start ) );
+
+        angle_in = PSH3_POINT_ANGLE( before, start );
+
+      } while ( angle_in == angle_seg );
+
+      first   = start;
+      diff_in = FT_Angle_Diff( angle_in, angle_seg );
+
+      /* 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;
+
+          } while ( PSH3_POINT_EQUAL_ORG( end, after ) );
+
+          angle_out = PSH3_POINT_ANGLE( end, after );
+
+        } while ( angle_out == angle_seg );
+
+        diff_out = FT_Angle_Diff( angle_seg, angle_out );
+
+        if ( ( diff_in ^ diff_out ) < 0 )
+        {
+          /* diff_in and diff_out have different signs, we have */
+          /* inflection points here...                          */
+
+          do
+          {
+            psh3_point_set_inflex( start );
+            start = start->next;
+          }
+          while ( start != end );
+
+          psh3_point_set_inflex( start );
+        }
+
+        start     = end;
+        end       = after;
+        angle_seg = angle_out;
+        diff_in   = diff_out;
+
+      } while ( !finished );
+
+    Skip:
+      ;
+    }
+  }
+
+#endif /* COMPUTE_INFLEXS */
+
+
+  static void
+  psh3_glyph_done( PSH3_Glyph  glyph )
+  {
+    FT_Memory  memory = glyph->memory;
+
+
+    psh3_hint_table_done( &glyph->hint_tables[1], memory );
+    psh3_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 = 0;
+  }
+
+
+  static int
+  psh3_compute_dir( FT_Pos  dx,
+                    FT_Pos  dy )
+  {
+    FT_Pos  ax, ay;
+    int     result = PSH3_DIR_NONE;
+
+
+    ax = ( dx >= 0 ) ? dx : -dx;
+    ay = ( dy >= 0 ) ? dy : -dy;
+
+    if ( ay * 12 < ax )
+    {
+      /* |dy| <<< |dx|  means a near-horizontal segment */
+      result = ( dx >= 0 ) ? PSH3_DIR_RIGHT : PSH3_DIR_LEFT;
+    }
+    else if ( ax * 12 < ay )
+    {
+      /* |dx| <<< |dy|  means a near-vertical segment */
+      result = ( dy >= 0 ) ? PSH3_DIR_UP : PSH3_DIR_DOWN;
+    }
+
+    return result;
+  }
+
+
+  /* load outline point coordinates into hinter glyph */
+  static void
+  psh3_glyph_load_points( PSH3_Glyph  glyph,
+                          FT_Int      dimension )
+  {
+    FT_Vector*  vec   = glyph->outline->points;
+    PSH3_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
+
+    }
+  }
+
+
+  /* save hinted point coordinates back to outline */
+  static void
+  psh3_glyph_save_points( PSH3_Glyph  glyph,
+                          FT_Int      dimension )
+  {
+    FT_UInt     n;
+    PSH3_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 ( psh3_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++;
+    }
+  }
+
+
+  static FT_Error
+  psh3_glyph_init( PSH3_Glyph   glyph,
+                   FT_Outline*  outline,
+                   PS_Hints     ps_hints,
+                   PSH_Globals  globals )
+  {
+    FT_Error   error;
+    FT_Memory  memory;
+
+
+    /* clear all fields */
+    FT_MEM_ZERO( glyph, sizeof ( *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   = outline->n_points;
+    glyph->num_contours = outline->n_contours;
+
+    {
+      FT_UInt       first = 0, next, n;
+      PSH3_Point    points  = glyph->points;
+      PSH3_Contour  contour = glyph->contours;
+
+
+      for ( n = 0; n < glyph->num_contours; n++ )
+      {
+        FT_Int      count;
+        PSH3_Point  point;
+
+
+        next  = outline->contours[n] + 1;
+        count = next - first;
+
+        contour->start = points + first;
+        contour->count = (FT_UInt)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;
+      }
+    }
+
+    {
+      PSH3_Point  points = glyph->points;
+      PSH3_Point  point  = points;
+      FT_Vector*  vec    = outline->points;
+      FT_UInt     n;
+
+
+      for ( n = 0; n < glyph->num_points; n++, point++ )
+      {
+        FT_Int  n_prev = point->prev - points;
+        FT_Int  n_next = point->next - points;
+        FT_Pos  dxi, dyi, dxo, dyo;
+
+
+        if ( !( outline->tags[n] & FT_CURVE_TAG_ON ) )
+          point->flags = PSH3_POINT_OFF;
+
+        dxi = vec[n].x - vec[n_prev].x;
+        dyi = vec[n].y - vec[n_prev].y;
+
+        point->dir_in = (FT_Char)psh3_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)psh3_compute_dir( dxo, dyo );
+
+        /* detect smooth points */
+        if ( point->flags & PSH3_POINT_OFF )
+          point->flags |= PSH3_POINT_SMOOTH;
+        else if ( point->dir_in  != PSH3_DIR_NONE ||
+                  point->dir_out != PSH3_DIR_NONE )
+        {
+          if ( point->dir_in == point->dir_out )
+            point->flags |= PSH3_POINT_SMOOTH;
+        }
+        else
+        {
+          FT_Angle  angle_in, angle_out, diff;
+
+
+          angle_in  = FT_Atan2( dxi, dyi );
+          angle_out = FT_Atan2( dxo, dyo );
+
+          diff = angle_in - angle_out;
+          if ( diff < 0 )
+            diff = -diff;
+
+          if ( diff > FT_ANGLE_PI )
+            diff = FT_ANGLE_2PI - diff;
+
+          if ( diff < FT_ANGLE_PI / 16 )
+            point->flags |= PSH3_POINT_SMOOTH;
+        }
+      }
+    }
+
+    glyph->memory  = memory;
+    glyph->outline = outline;
+    glyph->globals = globals;
+
+#ifdef COMPUTE_INFLEXS
+    psh3_glyph_load_points( glyph, 0 );
+    psh3_glyph_compute_inflections( glyph );
+#endif /* COMPUTE_INFLEXS */
+
+    /* now deal with hints tables */
+    error = psh3_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 = psh3_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;
+  }
+
+
+  /* compute all extrema in a glyph for a given dimension */
+  static void
+  psh3_glyph_compute_extrema( PSH3_Glyph  glyph )
+  {
+    FT_UInt  n;
+
+
+    /* first of all, compute all local extrema */
+    for ( n = 0; n < glyph->num_contours; n++ )
+    {
+      PSH3_Point  first = glyph->contours[n].start;
+      PSH3_Point  point, before, after;
+
+
+      point  = first;
+      before = point;
+      after  = 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
+            {
+              psh3_point_set_extremum( point );
+              point = point->next;
+
+            } while ( point != after );
+          }
+        }
+
+        before = after->prev;
+        point  = after;
+
+      } /* for  */
+
+    Next:
+      ;
+    }
+
+    /* for each extrema, determine its direction along the */
+    /* orthogonal axis                                     */
+    for ( n = 0; n < glyph->num_points; n++ )
+    {
+      PSH3_Point  point, before, after;
+
+
+      point  = &glyph->points[n];
+      before = point;
+      after  = point;
+
+      if ( psh3_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 )
+      {
+        psh3_point_set_positive( point );
+      }
+      else if ( before->org_v > point->org_v &&
+                after->org_v  < point->org_v )
+      {
+        psh3_point_set_negative( point );
+      }
+
+    Skip:
+      ;
+    }
+  }
+
+
+#define PSH3_STRONG_THRESHOLD  30
+
+
+  /* major_dir is the direction for points on the bottom/left of the stem; */
+  /* Points on the top/right of the stem will have a direction of          */
+  /* -major_dir.                                                           */
+
+  static void
+  psh3_hint_table_find_strong_point( PSH3_Hint_Table  table,
+                                     PSH3_Point       point,
+                                     FT_Int           major_dir )
+  {
+    PSH3_Hint*  sort      = table->sort;
+    FT_UInt     num_hints = table->num_hints;
+    FT_Int      point_dir = 0;
+
+
+    if ( PSH3_DIR_COMPARE( point->dir_in, major_dir ) )
+      point_dir = point->dir_in;
+
+    else if ( PSH3_DIR_COMPARE( point->dir_out, major_dir ) )
+      point_dir = point->dir_out;
+
+    if ( point_dir )
+    {
+      FT_UInt  flag;
+
+
+      for ( ; num_hints > 0; num_hints--, sort++ )
+      {
+        PSH3_Hint  hint = sort[0];
+        FT_Pos     d;
+
+
+        if ( point_dir == major_dir )
+        {
+          flag = PSH3_POINT_EDGE_MIN;
+          d    = point->org_u - hint->org_pos;
+
+          if ( ABS( d ) < PSH3_STRONG_THRESHOLD )
+          {
+          Is_Strong:
+            psh3_point_set_strong( point );
+            point->flags2 |= flag;
+            point->hint    = hint;
+            break;
+          }
+        }
+        else if ( point_dir == -major_dir )
+        {
+          flag  = PSH3_POINT_EDGE_MAX;
+          d     = point->org_u - hint->org_pos - hint->org_len;
+
+          if ( ABS( d ) < PSH3_STRONG_THRESHOLD )
+            goto Is_Strong;
+        }
+      }
+    }
+
+#if 1
+    else if ( psh3_point_is_extremum( point ) )
+    {
+      /* treat extrema as special cases for stem edge alignment */
+      FT_UInt  min_flag, max_flag;
+
+
+      if ( major_dir == PSH3_DIR_HORIZONTAL )
+      {
+        min_flag = PSH3_POINT_POSITIVE;
+        max_flag = PSH3_POINT_NEGATIVE;
+      }
+      else
+      {
+        min_flag = PSH3_POINT_NEGATIVE;
+        max_flag = PSH3_POINT_POSITIVE;
+      }
+
+      for ( ; num_hints > 0; num_hints--, sort++ )
+      {
+        PSH3_Hint  hint = sort[0];
+        FT_Pos     d, flag;
+
+
+        if ( point->flags2 & min_flag )
+        {
+          flag = PSH3_POINT_EDGE_MIN;
+          d    = point->org_u - hint->org_pos;
+
+          if ( ABS( d ) < PSH3_STRONG_THRESHOLD )
+          {
+          Is_Strong2:
+            point->flags2 |= flag;
+            point->hint    = hint;
+            psh3_point_set_strong( point );
+            break;
+          }
+        }
+        else if ( point->flags2 & max_flag )
+        {
+          flag = PSH3_POINT_EDGE_MAX;
+          d    = point->org_u - hint->org_pos - hint->org_len;
+
+          if ( ABS( d ) < PSH3_STRONG_THRESHOLD )
+            goto Is_Strong2;
+        }
+
+        if ( point->org_u >= hint->org_pos                 &&
+             point->org_u <= hint->org_pos + hint->org_len )
+        {
+          point->hint = hint;
+        }
+      }
+    }
+
+#endif /* 1 */
+  }
+
+
+  /* find strong points in a glyph */
+  static void
+  psh3_glyph_find_strong_points( PSH3_Glyph  glyph,
+                                 FT_Int      dimension )
+  {
+    /* a point is strong if it is located on a stem                   */
+    /* edge and has an "in" or "out" tangent to the hint's direction  */
+    {
+      PSH3_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 ? PSH3_DIR_VERTICAL
+                                                  : PSH3_DIR_HORIZONTAL;
+
+
+      /* process secondary hints to "selected" points */
+      if ( num_masks > 1 && glyph->num_points > 0 )
+      {
+        first = mask->end_point;
+        mask++;
+        for ( ; num_masks > 1; num_masks--, mask++ )
+        {
+          FT_UInt  next;
+          FT_Int   count;
+
+
+          next  = mask->end_point;
+          count = next - first;
+          if ( count > 0 )
+          {
+            PSH3_Point  point = glyph->points + first;
+
+
+            psh3_hint_table_activate_mask( table, mask );
+
+            for ( ; count > 0; count--, point++ )
+              psh3_hint_table_find_strong_point( table, point, major_dir );
+          }
+          first = next;
+        }
+      }
+
+      /* process primary hints for all points */
+      if ( num_masks == 1 )
+      {
+        FT_UInt     count = glyph->num_points;
+        PSH3_Point  point = glyph->points;
+
+
+        psh3_hint_table_activate_mask( table, table->hint_masks->masks );
+        for ( ; count > 0; count--, point++ )
+        {
+          if ( !psh3_point_is_strong( point ) )
+            psh3_hint_table_find_strong_point( table, point, major_dir );
+        }
+      }
+
+      /* now, certain points may have been attached to hint and */
+      /* not marked as strong; update their flags then          */
+      {
+        FT_UInt     count = glyph->num_points;
+        PSH3_Point  point = glyph->points;
+
+
+        for ( ; count > 0; count--, point++ )
+          if ( point->hint && !psh3_point_is_strong( point ) )
+            psh3_point_set_strong( point );
+      }
+    }
+  }
+
+
+  /* interpolate strong points with the help of hinted coordinates */
+  static void
+  psh3_glyph_interpolate_strong_points( PSH3_Glyph  glyph,
+                                        FT_Int      dimension )
+  {
+    PSH_Dimension  dim   = &glyph->globals->dimension[dimension];
+    FT_Fixed       scale = dim->scale_mult;
+
+
+    {
+      FT_UInt     count = glyph->num_points;
+      PSH3_Point  point = glyph->points;
+
+
+      for ( ; count > 0; count--, point++ )
+      {
+        PSH3_Hint  hint = point->hint;
+
+
+        if ( hint )
+        {
+          FT_Pos  delta;
+
+
+          if ( psh3_point_is_edge_min( point ) )
+          {
+            point->cur_u = hint->cur_pos;
+          }
+          else if ( psh3_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 if ( hint->org_len > 0 )
+              point->cur_u = hint->cur_pos +
+                               FT_MulDiv( delta, hint->cur_len,
+                                          hint->org_len );
+            else
+              point->cur_u = hint->cur_pos;
+          }
+          psh3_point_set_fitted( point );
+        }
+      }
+    }
+  }
+
+
+  static void
+  psh3_glyph_interpolate_normal_points( PSH3_Glyph  glyph,
+                                        FT_Int      dimension )
+  {
+
+#if 1
+
+    PSH_Dimension  dim   = &glyph->globals->dimension[dimension];
+    FT_Fixed       scale = dim->scale_mult;
+
+
+    /* first technique: a point is strong if it is a local extrema */
+    {
+      FT_UInt     count = glyph->num_points;
+      PSH3_Point  point = glyph->points;
+
+
+      for ( ; count > 0; count--, point++ )
+      {
+        if ( psh3_point_is_strong( point ) )
+          continue;
+
+        /* sometimes, some local extremas are smooth points */
+        if ( psh3_point_is_smooth( point ) )
+        {
+          if ( point->dir_in == PSH3_DIR_NONE  ||
+               point->dir_in != point->dir_out )
+            continue;
+
+          if ( !psh3_point_is_extremum( point )   &&
+               !psh3_point_is_inflex( point ) )
+            continue;
+
+          point->flags &= ~PSH3_POINT_SMOOTH;
+        }
+
+        /* find best enclosing point coordinates */
+        {
+          PSH3_Point  before = 0;
+          PSH3_Point  after  = 0;
+
+          FT_Pos      diff_before = -32000;
+          FT_Pos      diff_after  =  32000;
+          FT_Pos      u = point->org_u;
+
+          FT_Int      count2 = glyph->num_points;
+          PSH3_Point  cur    = glyph->points;
+
+
+          for ( ; count2 > 0; count2--, cur++ )
+          {
+            if ( psh3_point_is_strong( cur ) )
+            {
+              FT_Pos  diff = cur->org_u - u;;
+
+
+              if ( diff <= 0 )
+              {
+                if ( diff > diff_before )
+                {
+                  diff_before = diff;
+                  before      = cur;
+                }
+              }
+              else if ( diff >= 0 )
+              {
+                if ( diff < diff_after )
+                {
+                  diff_after = diff;
+                  after      = cur;
+                }
+              }
+            }
+          }
+
+          if ( !before )
+          {
+            if ( !after )
+              continue;
+
+            /* we are before the first strong point coordinate; */
+            /* simply translate the point                       */
+            point->cur_u = after->cur_u +
+                           FT_MulFix( point->org_u - after->org_u, scale );
+          }
+          else if ( !after )
+          {
+            /* we are after the last strong point coordinate; */
+            /* simply translate the point                     */
+            point->cur_u = before->cur_u +
+                           FT_MulFix( point->org_u - before->org_u, scale );
+          }
+          else
+          {
+            if ( diff_before == 0 )
+              point->cur_u = before->cur_u;
+
+            else if ( diff_after == 0 )
+              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 );
+          }
+
+          psh3_point_set_fitted( point );
+        }
+      }
+    }
+
+#endif /* 1 */
+
+  }
+
+
+  /* interpolate other points */
+  static void
+  psh3_glyph_interpolate_other_points( PSH3_Glyph  glyph,
+                                       FT_Int      dimension )
+  {
+    PSH_Dimension  dim          = &glyph->globals->dimension[dimension];
+    FT_Fixed       scale        = dim->scale_mult;
+    FT_Fixed       delta        = dim->scale_delta;
+    PSH3_Contour   contour      = glyph->contours;
+    FT_UInt        num_contours = glyph->num_contours;
+
+
+    for ( ; num_contours > 0; num_contours--, contour++ )
+    {
+      PSH3_Point  start = contour->start;
+      PSH3_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     = 0;
+
+      for ( point = start; point < next; point++ )
+        if ( psh3_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
+      {
+        point = first;
+
+        /* skip consecutive fitted points */
+        for (;;)
+        {
+          next = first->next;
+          if ( next == start )
+            goto Next_Contour;
+
+          if ( !psh3_point_is_fitted( next ) )
+            break;
+
+          first = next;
+        }
+
+        /* find next fitted point after unfitted one */
+        for (;;)
+        {
+          next = next->next;
+          if ( psh3_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:
+      ;
+    }
+  }
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****                     HIGH-LEVEL INTERFACE                      *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+  FT_Error
+  ps3_hints_apply( PS_Hints        ps_hints,
+                   FT_Outline*     outline,
+                   PSH_Globals     globals,
+                   FT_Render_Mode  hint_mode )
+  {
+    PSH3_GlyphRec  glyphrec;
+    PSH3_Glyph     glyph = &glyphrec;
+    FT_Error       error;
+#ifdef DEBUG_HINTER
+    FT_Memory      memory;
+#endif
+    FT_Int         dimension;
+
+
+#ifdef DEBUG_HINTER
+
+    memory = globals->memory;
+
+    if ( ps3_debug_glyph )
+    {
+      psh3_glyph_done( ps3_debug_glyph );
+      FT_FREE( ps3_debug_glyph );
+    }
+
+    if ( FT_NEW( glyph ) )
+      return error;
+
+    ps3_debug_glyph = glyph;
+
+#endif /* DEBUG_HINTER */
+
+    error = psh3_glyph_init( glyph, outline, ps_hints, globals );
+    if ( error )
+      goto Exit;
+
+    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 );
+
+    for ( dimension = 0; dimension < 2; dimension++ )
+    {
+      /* load outline coordinates into glyph */
+      psh3_glyph_load_points( glyph, dimension );
+
+      /* compute local extrema */
+      psh3_glyph_compute_extrema( glyph );
+
+      /* compute aligned stem/hints positions */
+      psh3_hint_table_align_hints( &glyph->hint_tables[dimension],
+                                   glyph->globals,
+                                   dimension,
+                                   glyph );
+
+      /* find strong points, align them, then interpolate others */
+      psh3_glyph_find_strong_points( glyph, dimension );
+      psh3_glyph_interpolate_strong_points( glyph, dimension );
+      psh3_glyph_interpolate_normal_points( glyph, dimension );
+      psh3_glyph_interpolate_other_points( glyph, dimension );
+
+      /* save hinted coordinates back to outline */
+      psh3_glyph_save_points( glyph, dimension );
+    }
+
+  Exit:
+
+#ifndef DEBUG_HINTER
+    psh3_glyph_done( glyph );
+#endif
+
+    return error;
+  }
+
+
+/* END */