afcjk.c

winNT技术操作系统,国外开放的原代码和LIUX一样

    }

    return delta;
  }


  static void
  af_cjk_hint_edges( AF_GlyphHints  hints,
                     AF_Dimension   dim )
  {
    AF_AxisHints  axis       = &hints->axis[dim];
    AF_Edge       edges      = axis->edges;
    AF_Edge       edge_limit = edges + axis->num_edges;
    FT_Int        n_edges;
    AF_Edge       edge;
    AF_Edge       anchor   = 0;
    FT_Pos        delta    = 0;
    FT_Int        skipped  = 0;


    /* now we align all stem edges. */
    for ( edge = edges; edge < edge_limit; edge++ )
    {
      AF_Edge  edge2;


      if ( edge->flags & AF_EDGE_DONE )
        continue;

      /* skip all non-stem edges */
      edge2 = edge->link;
      if ( !edge2 )
      {
        skipped++;
        continue;
      }

      /* now align the stem */

      if ( edge2 < edge )
      {
        af_cjk_align_linked_edge( hints, dim, edge2, edge );
        edge->flags |= AF_EDGE_DONE;
        continue;
      }

      if ( dim != AF_DIMENSION_VERT && !anchor )
      {

#if 0
        if ( fixedpitch )
        {
          AF_Edge     left  = edge;
          AF_Edge     right = edge_limit - 1;
          AF_EdgeRec  left1, left2, right1, right2;
          FT_Pos      target, center1, center2;
          FT_Pos      delta1, delta2, d1, d2;


          while ( right > left && !right->link )
            right--;

          left1  = *left;
          left2  = *left->link;
          right1 = *right->link;
          right2 = *right;

          delta  = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
          target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;

          delta1  = delta;
          delta1 += af_hint_normal_stem( hints, left, left->link,
                                         delta1, 0 );

          if ( left->link != right )
            af_hint_normal_stem( hints, right->link, right, delta1, 0 );

          center1 = left->pos + ( right->pos - left->pos ) / 2;

          if ( center1 >= target )
            delta2 = delta - 32;
          else
            delta2 = delta + 32;

          delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );

          if ( delta1 != delta2 )
          {
            if ( left->link != right )
              af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );

            center2 = left1.pos + ( right2.pos - left1.pos ) / 2;

            d1 = center1 - target;
            d2 = center2 - target;

            if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
            {
              left->pos       = left1.pos;
              left->link->pos = left2.pos;

              if ( left->link != right )
              {
                right->link->pos = right1.pos;
                right->pos       = right2.pos;
              }

              delta1 = delta2;
            }
          }

          delta               = delta1;
          right->link->flags |= AF_EDGE_DONE;
          right->flags       |= AF_EDGE_DONE;
        }
        else

#endif /* 0 */

          delta = af_hint_normal_stem( hints, edge, edge2, 0,
                                       AF_DIMENSION_HORZ );
      }
      else
        af_hint_normal_stem( hints, edge, edge2, delta, dim );

#if 0
      printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
               edge - edges, edge2 - edges,
               ( edge->pos - edge->opos ) / 64.0,
               ( edge2->pos - edge2->opos ) / 64.0 );
#endif

      anchor = edge;
      edge->flags  |= AF_EDGE_DONE;
      edge2->flags |= AF_EDGE_DONE;
    }

    /* make sure that lowercase m's maintain their symmetry */

    /* In general, lowercase m's have six vertical edges if they are sans */
    /* serif, or twelve if they are with serifs.  This implementation is  */
    /* based on that assumption, and seems to work very well with most    */
    /* faces.  However, if for a certain face this assumption is not      */
    /* true, the m is just rendered like before.  In addition, any stem   */
    /* correction will only be applied to symmetrical glyphs (even if the */
    /* glyph is not an m), so the potential for unwanted distortion is    */
    /* relatively low.                                                    */

    /* We don't handle horizontal edges since we can't easily assure that */
    /* the third (lowest) stem aligns with the base line; it might end up */
    /* one pixel higher or lower.                                         */

    n_edges = edge_limit - edges;
    if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
    {
      AF_Edge  edge1, edge2, edge3;
      FT_Pos   dist1, dist2, span;


      if ( n_edges == 6 )
      {
        edge1 = edges;
        edge2 = edges + 2;
        edge3 = edges + 4;
      }
      else
      {
        edge1 = edges + 1;
        edge2 = edges + 5;
        edge3 = edges + 9;
      }

      dist1 = edge2->opos - edge1->opos;
      dist2 = edge3->opos - edge2->opos;

      span = dist1 - dist2;
      if ( span < 0 )
        span = -span;

      if ( edge1->link == edge1 + 1 &&
           edge2->link == edge2 + 1 &&
           edge3->link == edge3 + 1 && span < 8 )
      {
        delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
        edge3->pos -= delta;
        if ( edge3->link )
          edge3->link->pos -= delta;

        /* move the serifs along with the stem */
        if ( n_edges == 12 )
        {
          ( edges + 8 )->pos -= delta;
          ( edges + 11 )->pos -= delta;
        }

        edge3->flags |= AF_EDGE_DONE;
        if ( edge3->link )
          edge3->link->flags |= AF_EDGE_DONE;
      }
    }

    if ( !skipped )
      return;

    /*
     *  now hint the remaining edges (serifs and single) in order
     *  to complete our processing
     */
    for ( edge = edges; edge < edge_limit; edge++ )
    {
      if ( edge->flags & AF_EDGE_DONE )
        continue;

      if ( edge->serif )
      {
        af_cjk_align_serif_edge( hints, edge->serif, edge );
        edge->flags |= AF_EDGE_DONE;
        skipped--;
      }
    }

    if ( !skipped )
      return;

    for ( edge = edges; edge < edge_limit; edge++ )
    {
      AF_Edge  before, after;


      if ( edge->flags & AF_EDGE_DONE )
        continue;

      before = after = edge;

      while ( --before >= edges )
        if ( before->flags & AF_EDGE_DONE )
          break;

      while ( ++after < edge_limit )
        if ( after->flags & AF_EDGE_DONE )
          break;

      if ( before >= edges || after < edge_limit )
      {
        if ( before < edges )
          af_cjk_align_serif_edge( hints, after, edge );
        else if ( after >= edge_limit )
          af_cjk_align_serif_edge( hints, before, edge );
        else
          edge->pos = before->pos +
            FT_MulDiv( edge->fpos - before->fpos,
                       after->pos - before->pos,
                       after->fpos - before->fpos );
      }
    }
  }


  static void
  af_cjk_align_edge_points( AF_GlyphHints  hints,
                            AF_Dimension   dim )
  {
    AF_AxisHints  axis       = & hints->axis[dim];
    AF_Edge       edges      = axis->edges;
    AF_Edge       edge_limit = edges + axis->num_edges;
    AF_Edge       edge;
    FT_Bool       snapping;


    snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ             &&
                          AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) )  ||
                        ( dim == AF_DIMENSION_VERT             &&
                          AF_LATIN_HINTS_DO_VERT_SNAP( hints ) )  );

    for ( edge = edges; edge < edge_limit; edge++ )
    {
      /* move the points of each segment     */
      /* in each edge to the edge's position */
      AF_Segment  seg = edge->first;


      if ( snapping )
      {
        do
        {
          AF_Point  point = seg->first;


          for (;;)
          {
            if ( dim == AF_DIMENSION_HORZ )
            {
              point->x      = edge->pos;
              point->flags |= AF_FLAG_TOUCH_X;
            }
            else
            {
              point->y      = edge->pos;
              point->flags |= AF_FLAG_TOUCH_Y;
            }

            if ( point == seg->last )
              break;

            point = point->next;
          }

          seg = seg->edge_next;

        } while ( seg != edge->first );
      }
      else
      {
        FT_Pos  delta = edge->pos - edge->opos;


        do
        {
          AF_Point  point = seg->first;


          for (;;)
          {
            if ( dim == AF_DIMENSION_HORZ )
            {
              point->x     += delta;
              point->flags |= AF_FLAG_TOUCH_X;
            }
            else
            {
              point->y     += delta;
              point->flags |= AF_FLAG_TOUCH_Y;
            }

            if ( point == seg->last )
              break;

            point = point->next;
          }

          seg = seg->edge_next;

        } while ( seg != edge->first );
      }
    }
  }


  static FT_Error
  af_cjk_hints_apply( AF_GlyphHints    hints,
                      FT_Outline*      outline,
                      AF_LatinMetrics  metrics )
  {
    FT_Error  error;
    int       dim;

    FT_UNUSED( metrics );


    error = af_glyph_hints_reload( hints, outline );
    if ( error )
      goto Exit;

    /* analyze glyph outline */
    if ( AF_HINTS_DO_HORIZONTAL( hints ) )
    {
      error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
      if ( error )
        goto Exit;
    }

    if ( AF_HINTS_DO_VERTICAL( hints ) )
    {
      error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
      if ( error )
        goto Exit;
    }

    /* grid-fit the outline */
    for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
    {
      if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
           ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) )   )
      {

#ifdef AF_USE_WARPER
        if ( dim == AF_DIMENSION_HORZ                                  &&
             metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL )
        {
          AF_WarperRec  warper;
          FT_Fixed      scale;
          FT_Pos        delta;


          af_warper_compute( &warper, hints, dim, &scale, &delta );
          af_glyph_hints_scale_dim( hints, dim, scale, delta );
          continue;
        }
#endif /* AF_USE_WARPER */

        af_cjk_hint_edges( hints, (AF_Dimension)dim );
        af_cjk_align_edge_points( hints, (AF_Dimension)dim );
        af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
        af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
      }
    }

#if 0
    af_glyph_hints_dump_points( hints );
    af_glyph_hints_dump_segments( hints );
    af_glyph_hints_dump_edges( hints );
#endif

    af_glyph_hints_save( hints, outline );

  Exit:
    return error;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                C J K   S C R I P T   C L A S S                *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  static const AF_Script_UniRangeRec  af_cjk_uniranges[] =
  {
#if 0
    { 0x0100,  0xFFFF },  /* why this? */
#endif
    { 0x2E80,  0x2EFF },  /* CJK Radicals Supplement */
    { 0x2F00,  0x2FDF },  /* Kangxi Radicals */
    { 0x3000,  0x303F },  /* CJK Symbols and Punctuation */
    { 0x3040,  0x309F },  /* Hiragana */
    { 0x30A0,  0x30FF },  /* Katakana */
    { 0x3100,  0x312F },  /* Bopomofo */
    { 0x3130,  0x318F },  /* Hangul Compatibility Jamo */
    { 0x31A0,  0x31BF },  /* Bopomofo Extended */
    { 0x31C0,  0x31EF },  /* CJK Strokes */
    { 0x31F0,  0x31FF },  /* Katakana Phonetic Extensions */
    { 0x3200,  0x32FF },  /* Enclosed CJK Letters and Months */
    { 0x3300,  0x33FF },  /* CJK Compatibility */
    { 0x3400,  0x4DBF },  /* CJK Unified Ideographs Extension A */
    { 0x4DC0,  0x4DFF },  /* Yijing Hexagram Symbols */
    { 0x4E00,  0x9FFF },  /* CJK Unified Ideographs */
    { 0xF900,  0xFAFF },  /* CJK Compatibility Ideographs */
    { 0xFE30,  0xFE4F },  /* CJK Compatibility Forms */
    { 0xFF00,  0xFFEF },  /* Halfwidth and Fullwidth Forms */
    { 0x20000, 0x2A6DF }, /* CJK Unified Ideographs Extension B */
    { 0x2F800, 0x2FA1F }, /* CJK Compatibility Ideographs Supplement */
    { 0,       0 }
  };


  FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec
  af_cjk_script_class =
  {
    AF_SCRIPT_CJK,
    af_cjk_uniranges,

    sizeof( AF_LatinMetricsRec ),

    (AF_Script_InitMetricsFunc) af_cjk_metrics_init,
    (AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale,
    (AF_Script_DoneMetricsFunc) NULL,

    (AF_Script_InitHintsFunc)   af_cjk_hints_init,
    (AF_Script_ApplyHintsFunc)  af_cjk_hints_apply
  };

#else /* !AF_CONFIG_OPTION_CJK */

  static const AF_Script_UniRangeRec  af_cjk_uniranges[] =
  {
    { 0, 0 }
  };


  FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec
  af_cjk_script_class =
  {
    AF_SCRIPT_CJK,
    af_cjk_uniranges,

    sizeof( AF_LatinMetricsRec ),

    (AF_Script_InitMetricsFunc) NULL,
    (AF_Script_ScaleMetricsFunc)NULL,
    (AF_Script_DoneMetricsFunc) NULL,

    (AF_Script_InitHintsFunc)   NULL,
    (AF_Script_ApplyHintsFunc)  NULL
  };

#endif /* !AF_CONFIG_OPTION_CJK */


/* END */