misc/libfreetype/src/autofit/afcjk.c
changeset 9372 915436ff64ab
parent 9371 f3840de881bd
child 9373 b769a8e38cbd
equal deleted inserted replaced
9371:f3840de881bd 9372:915436ff64ab
     1 /***************************************************************************/
       
     2 /*                                                                         */
       
     3 /*  afcjk.c                                                                */
       
     4 /*                                                                         */
       
     5 /*    Auto-fitter hinting routines for CJK script (body).                  */
       
     6 /*                                                                         */
       
     7 /*  Copyright 2006-2011 by                                                 */
       
     8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
       
     9 /*                                                                         */
       
    10 /*  This file is part of the FreeType project, and may only be used,       */
       
    11 /*  modified, and distributed under the terms of the FreeType project      */
       
    12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
       
    13 /*  this file you indicate that you have read the license and              */
       
    14 /*  understand and accept it fully.                                        */
       
    15 /*                                                                         */
       
    16 /***************************************************************************/
       
    17 
       
    18   /*
       
    19    *  The algorithm is based on akito's autohint patch, available here:
       
    20    *
       
    21    *  http://www.kde.gr.jp/~akito/patch/freetype2/
       
    22    *
       
    23    */
       
    24 
       
    25 #include "aftypes.h"
       
    26 #include "aflatin.h"
       
    27 
       
    28 
       
    29 #ifdef AF_CONFIG_OPTION_CJK
       
    30 
       
    31 #include "afcjk.h"
       
    32 #include "aferrors.h"
       
    33 
       
    34 
       
    35 #ifdef AF_CONFIG_OPTION_USE_WARPER
       
    36 #include "afwarp.h"
       
    37 #endif
       
    38 
       
    39 
       
    40   /*************************************************************************/
       
    41   /*************************************************************************/
       
    42   /*****                                                               *****/
       
    43   /*****              C J K   G L O B A L   M E T R I C S              *****/
       
    44   /*****                                                               *****/
       
    45   /*************************************************************************/
       
    46   /*************************************************************************/
       
    47 
       
    48   FT_LOCAL_DEF( FT_Error )
       
    49   af_cjk_metrics_init( AF_LatinMetrics  metrics,
       
    50                        FT_Face          face )
       
    51   {
       
    52     FT_CharMap  oldmap = face->charmap;
       
    53 
       
    54 
       
    55     metrics->units_per_em = face->units_per_EM;
       
    56 
       
    57     /* TODO are there blues? */
       
    58 
       
    59     if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
       
    60       face->charmap = NULL;
       
    61     else
       
    62     {
       
    63       /* latin's version would suffice */
       
    64       af_latin_metrics_init_widths( metrics, face, 0x7530 );
       
    65       af_latin_metrics_check_digits( metrics, face );
       
    66     }
       
    67 
       
    68     FT_Set_Charmap( face, oldmap );
       
    69 
       
    70     return AF_Err_Ok;
       
    71   }
       
    72 
       
    73 
       
    74   static void
       
    75   af_cjk_metrics_scale_dim( AF_LatinMetrics  metrics,
       
    76                             AF_Scaler        scaler,
       
    77                             AF_Dimension     dim )
       
    78   {
       
    79     AF_LatinAxis  axis;
       
    80 
       
    81 
       
    82     axis = &metrics->axis[dim];
       
    83 
       
    84     if ( dim == AF_DIMENSION_HORZ )
       
    85     {
       
    86       axis->scale = scaler->x_scale;
       
    87       axis->delta = scaler->x_delta;
       
    88     }
       
    89     else
       
    90     {
       
    91       axis->scale = scaler->y_scale;
       
    92       axis->delta = scaler->y_delta;
       
    93     }
       
    94   }
       
    95 
       
    96 
       
    97   FT_LOCAL_DEF( void )
       
    98   af_cjk_metrics_scale( AF_LatinMetrics  metrics,
       
    99                         AF_Scaler        scaler )
       
   100   {
       
   101     metrics->root.scaler = *scaler;
       
   102 
       
   103     af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
       
   104     af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
       
   105   }
       
   106 
       
   107 
       
   108   /*************************************************************************/
       
   109   /*************************************************************************/
       
   110   /*****                                                               *****/
       
   111   /*****              C J K   G L Y P H   A N A L Y S I S              *****/
       
   112   /*****                                                               *****/
       
   113   /*************************************************************************/
       
   114   /*************************************************************************/
       
   115 
       
   116   static FT_Error
       
   117   af_cjk_hints_compute_segments( AF_GlyphHints  hints,
       
   118                                  AF_Dimension   dim )
       
   119   {
       
   120     AF_AxisHints  axis          = &hints->axis[dim];
       
   121     AF_Segment    segments      = axis->segments;
       
   122     AF_Segment    segment_limit = segments + axis->num_segments;
       
   123     FT_Error      error;
       
   124     AF_Segment    seg;
       
   125 
       
   126 
       
   127     error = af_latin_hints_compute_segments( hints, dim );
       
   128     if ( error )
       
   129       return error;
       
   130 
       
   131     /* a segment is round if it doesn't have successive */
       
   132     /* on-curve points.                                 */
       
   133     for ( seg = segments; seg < segment_limit; seg++ )
       
   134     {
       
   135       AF_Point  pt   = seg->first;
       
   136       AF_Point  last = seg->last;
       
   137       AF_Flags  f0   = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
       
   138       AF_Flags  f1;
       
   139 
       
   140 
       
   141       seg->flags &= ~AF_EDGE_ROUND;
       
   142 
       
   143       for ( ; pt != last; f0 = f1 )
       
   144       {
       
   145         pt = pt->next;
       
   146         f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
       
   147 
       
   148         if ( !f0 && !f1 )
       
   149           break;
       
   150 
       
   151         if ( pt == last )
       
   152           seg->flags |= AF_EDGE_ROUND;
       
   153       }
       
   154     }
       
   155 
       
   156     return AF_Err_Ok;
       
   157   }
       
   158 
       
   159 
       
   160   static void
       
   161   af_cjk_hints_link_segments( AF_GlyphHints  hints,
       
   162                               AF_Dimension   dim )
       
   163   {
       
   164     AF_AxisHints  axis          = &hints->axis[dim];
       
   165     AF_Segment    segments      = axis->segments;
       
   166     AF_Segment    segment_limit = segments + axis->num_segments;
       
   167     AF_Direction  major_dir     = axis->major_dir;
       
   168     AF_Segment    seg1, seg2;
       
   169     FT_Pos        len_threshold;
       
   170     FT_Pos        dist_threshold;
       
   171 
       
   172 
       
   173     len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
       
   174 
       
   175     dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
       
   176                                                   : hints->y_scale;
       
   177     dist_threshold = FT_DivFix( 64 * 3, dist_threshold );
       
   178 
       
   179     /* now compare each segment to the others */
       
   180     for ( seg1 = segments; seg1 < segment_limit; seg1++ )
       
   181     {
       
   182       /* the fake segments are for metrics hinting only */
       
   183       if ( seg1->first == seg1->last )
       
   184         continue;
       
   185 
       
   186       if ( seg1->dir != major_dir )
       
   187         continue;
       
   188 
       
   189       for ( seg2 = segments; seg2 < segment_limit; seg2++ )
       
   190         if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
       
   191         {
       
   192           FT_Pos  dist = seg2->pos - seg1->pos;
       
   193 
       
   194 
       
   195           if ( dist < 0 )
       
   196             continue;
       
   197 
       
   198           {
       
   199             FT_Pos  min = seg1->min_coord;
       
   200             FT_Pos  max = seg1->max_coord;
       
   201             FT_Pos  len;
       
   202 
       
   203 
       
   204             if ( min < seg2->min_coord )
       
   205               min = seg2->min_coord;
       
   206 
       
   207             if ( max > seg2->max_coord )
       
   208               max = seg2->max_coord;
       
   209 
       
   210             len = max - min;
       
   211             if ( len >= len_threshold )
       
   212             {
       
   213               if ( dist * 8 < seg1->score * 9                        &&
       
   214                    ( dist * 8 < seg1->score * 7 || seg1->len < len ) )
       
   215               {
       
   216                 seg1->score = dist;
       
   217                 seg1->len   = len;
       
   218                 seg1->link  = seg2;
       
   219               }
       
   220 
       
   221               if ( dist * 8 < seg2->score * 9                        &&
       
   222                    ( dist * 8 < seg2->score * 7 || seg2->len < len ) )
       
   223               {
       
   224                 seg2->score = dist;
       
   225                 seg2->len   = len;
       
   226                 seg2->link  = seg1;
       
   227               }
       
   228             }
       
   229           }
       
   230         }
       
   231     }
       
   232 
       
   233     /*
       
   234      *  now compute the `serif' segments
       
   235      *
       
   236      *  In Hanzi, some strokes are wider on one or both of the ends.
       
   237      *  We either identify the stems on the ends as serifs or remove
       
   238      *  the linkage, depending on the length of the stems.
       
   239      *
       
   240      */
       
   241 
       
   242     {
       
   243       AF_Segment  link1, link2;
       
   244 
       
   245 
       
   246       for ( seg1 = segments; seg1 < segment_limit; seg1++ )
       
   247       {
       
   248         link1 = seg1->link;
       
   249         if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )
       
   250           continue;
       
   251 
       
   252         if ( seg1->score >= dist_threshold )
       
   253           continue;
       
   254 
       
   255         for ( seg2 = segments; seg2 < segment_limit; seg2++ )
       
   256         {
       
   257           if ( seg2->pos > seg1->pos || seg1 == seg2 )
       
   258             continue;
       
   259 
       
   260           link2 = seg2->link;
       
   261           if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )
       
   262             continue;
       
   263 
       
   264           if ( seg1->pos == seg2->pos && link1->pos == link2->pos )
       
   265             continue;
       
   266 
       
   267           if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )
       
   268             continue;
       
   269 
       
   270           /* seg2 < seg1 < link1 < link2 */
       
   271 
       
   272           if ( seg1->len >= seg2->len * 3 )
       
   273           {
       
   274             AF_Segment  seg;
       
   275 
       
   276 
       
   277             for ( seg = segments; seg < segment_limit; seg++ )
       
   278             {
       
   279               AF_Segment  link = seg->link;
       
   280 
       
   281 
       
   282               if ( link == seg2 )
       
   283               {
       
   284                 seg->link  = 0;
       
   285                 seg->serif = link1;
       
   286               }
       
   287               else if ( link == link2 )
       
   288               {
       
   289                 seg->link  = 0;
       
   290                 seg->serif = seg1;
       
   291               }
       
   292             }
       
   293           }
       
   294           else
       
   295           {
       
   296             seg1->link = link1->link = 0;
       
   297 
       
   298             break;
       
   299           }
       
   300         }
       
   301       }
       
   302     }
       
   303 
       
   304     for ( seg1 = segments; seg1 < segment_limit; seg1++ )
       
   305     {
       
   306       seg2 = seg1->link;
       
   307 
       
   308       if ( seg2 )
       
   309       {
       
   310         seg2->num_linked++;
       
   311         if ( seg2->link != seg1 )
       
   312         {
       
   313           seg1->link = 0;
       
   314 
       
   315           if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
       
   316             seg1->serif = seg2->link;
       
   317           else
       
   318             seg2->num_linked--;
       
   319         }
       
   320       }
       
   321     }
       
   322   }
       
   323 
       
   324 
       
   325   static FT_Error
       
   326   af_cjk_hints_compute_edges( AF_GlyphHints  hints,
       
   327                               AF_Dimension   dim )
       
   328   {
       
   329     AF_AxisHints  axis   = &hints->axis[dim];
       
   330     FT_Error      error  = AF_Err_Ok;
       
   331     FT_Memory     memory = hints->memory;
       
   332     AF_LatinAxis  laxis  = &((AF_LatinMetrics)hints->metrics)->axis[dim];
       
   333 
       
   334     AF_Segment    segments      = axis->segments;
       
   335     AF_Segment    segment_limit = segments + axis->num_segments;
       
   336     AF_Segment    seg;
       
   337 
       
   338     FT_Fixed      scale;
       
   339     FT_Pos        edge_distance_threshold;
       
   340 
       
   341 
       
   342     axis->num_edges = 0;
       
   343 
       
   344     scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
       
   345                                          : hints->y_scale;
       
   346 
       
   347     /*********************************************************************/
       
   348     /*                                                                   */
       
   349     /* We begin by generating a sorted table of edges for the current    */
       
   350     /* direction.  To do so, we simply scan each segment and try to find */
       
   351     /* an edge in our table that corresponds to its position.            */
       
   352     /*                                                                   */
       
   353     /* If no edge is found, we create and insert a new edge in the       */
       
   354     /* sorted table.  Otherwise, we simply add the segment to the edge's */
       
   355     /* list which is then processed in the second step to compute the    */
       
   356     /* edge's properties.                                                */
       
   357     /*                                                                   */
       
   358     /* Note that the edges table is sorted along the segment/edge        */
       
   359     /* position.                                                         */
       
   360     /*                                                                   */
       
   361     /*********************************************************************/
       
   362 
       
   363     edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
       
   364                                          scale );
       
   365     if ( edge_distance_threshold > 64 / 4 )
       
   366       edge_distance_threshold = FT_DivFix( 64 / 4, scale );
       
   367     else
       
   368       edge_distance_threshold = laxis->edge_distance_threshold;
       
   369 
       
   370     for ( seg = segments; seg < segment_limit; seg++ )
       
   371     {
       
   372       AF_Edge  found = 0;
       
   373       FT_Pos   best  = 0xFFFFU;
       
   374       FT_Int   ee;
       
   375 
       
   376 
       
   377       /* look for an edge corresponding to the segment */
       
   378       for ( ee = 0; ee < axis->num_edges; ee++ )
       
   379       {
       
   380         AF_Edge  edge = axis->edges + ee;
       
   381         FT_Pos   dist;
       
   382 
       
   383 
       
   384         if ( edge->dir != seg->dir )
       
   385           continue;
       
   386 
       
   387         dist = seg->pos - edge->fpos;
       
   388         if ( dist < 0 )
       
   389           dist = -dist;
       
   390 
       
   391         if ( dist < edge_distance_threshold && dist < best )
       
   392         {
       
   393           AF_Segment  link = seg->link;
       
   394 
       
   395 
       
   396           /* check whether all linked segments of the candidate edge */
       
   397           /* can make a single edge.                                 */
       
   398           if ( link )
       
   399           {
       
   400             AF_Segment  seg1 = edge->first;
       
   401             AF_Segment  link1;
       
   402             FT_Pos      dist2 = 0;
       
   403 
       
   404 
       
   405             do
       
   406             {
       
   407               link1 = seg1->link;
       
   408               if ( link1 )
       
   409               {
       
   410                 dist2 = AF_SEGMENT_DIST( link, link1 );
       
   411                 if ( dist2 >= edge_distance_threshold )
       
   412                   break;
       
   413               }
       
   414 
       
   415             } while ( ( seg1 = seg1->edge_next ) != edge->first );
       
   416 
       
   417             if ( dist2 >= edge_distance_threshold )
       
   418               continue;
       
   419           }
       
   420 
       
   421           best  = dist;
       
   422           found = edge;
       
   423         }
       
   424       }
       
   425 
       
   426       if ( !found )
       
   427       {
       
   428         AF_Edge  edge;
       
   429 
       
   430 
       
   431         /* insert a new edge in the list and */
       
   432         /* sort according to the position    */
       
   433         error = af_axis_hints_new_edge( axis, seg->pos,
       
   434                                         (AF_Direction)seg->dir,
       
   435                                         memory, &edge );
       
   436         if ( error )
       
   437           goto Exit;
       
   438 
       
   439         /* add the segment to the new edge's list */
       
   440         FT_ZERO( edge );
       
   441 
       
   442         edge->first    = seg;
       
   443         edge->last     = seg;
       
   444         edge->fpos     = seg->pos;
       
   445         edge->opos     = edge->pos = FT_MulFix( seg->pos, scale );
       
   446         seg->edge_next = seg;
       
   447         edge->dir      = seg->dir;
       
   448       }
       
   449       else
       
   450       {
       
   451         /* if an edge was found, simply add the segment to the edge's */
       
   452         /* list                                                       */
       
   453         seg->edge_next         = found->first;
       
   454         found->last->edge_next = seg;
       
   455         found->last            = seg;
       
   456       }
       
   457     }
       
   458 
       
   459     /*********************************************************************/
       
   460     /*                                                                   */
       
   461     /* Good, we now compute each edge's properties according to segments */
       
   462     /* found on its position.  Basically, these are as follows.          */
       
   463     /*                                                                   */
       
   464     /*  - edge's main direction                                          */
       
   465     /*  - stem edge, serif edge or both (which defaults to stem then)    */
       
   466     /*  - rounded edge, straight or both (which defaults to straight)    */
       
   467     /*  - link for edge                                                  */
       
   468     /*                                                                   */
       
   469     /*********************************************************************/
       
   470 
       
   471     /* first of all, set the `edge' field in each segment -- this is     */
       
   472     /* required in order to compute edge links                           */
       
   473     /*                                                                   */
       
   474     /* Note that removing this loop and setting the `edge' field of each */
       
   475     /* segment directly in the code above slows down execution speed for */
       
   476     /* some reasons on platforms like the Sun.                           */
       
   477 
       
   478     {
       
   479       AF_Edge  edges      = axis->edges;
       
   480       AF_Edge  edge_limit = edges + axis->num_edges;
       
   481       AF_Edge  edge;
       
   482 
       
   483 
       
   484       for ( edge = edges; edge < edge_limit; edge++ )
       
   485       {
       
   486         seg = edge->first;
       
   487         if ( seg )
       
   488           do
       
   489           {
       
   490             seg->edge = edge;
       
   491             seg       = seg->edge_next;
       
   492 
       
   493           } while ( seg != edge->first );
       
   494       }
       
   495 
       
   496       /* now compute each edge properties */
       
   497       for ( edge = edges; edge < edge_limit; edge++ )
       
   498       {
       
   499         FT_Int  is_round    = 0;  /* does it contain round segments?    */
       
   500         FT_Int  is_straight = 0;  /* does it contain straight segments? */
       
   501 
       
   502 
       
   503         seg = edge->first;
       
   504 
       
   505         do
       
   506         {
       
   507           FT_Bool  is_serif;
       
   508 
       
   509 
       
   510           /* check for roundness of segment */
       
   511           if ( seg->flags & AF_EDGE_ROUND )
       
   512             is_round++;
       
   513           else
       
   514             is_straight++;
       
   515 
       
   516           /* check for links -- if seg->serif is set, then seg->link must */
       
   517           /* be ignored                                                   */
       
   518           is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge );
       
   519 
       
   520           if ( seg->link || is_serif )
       
   521           {
       
   522             AF_Edge     edge2;
       
   523             AF_Segment  seg2;
       
   524 
       
   525 
       
   526             edge2 = edge->link;
       
   527             seg2  = seg->link;
       
   528 
       
   529             if ( is_serif )
       
   530             {
       
   531               seg2  = seg->serif;
       
   532               edge2 = edge->serif;
       
   533             }
       
   534 
       
   535             if ( edge2 )
       
   536             {
       
   537               FT_Pos  edge_delta;
       
   538               FT_Pos  seg_delta;
       
   539 
       
   540 
       
   541               edge_delta = edge->fpos - edge2->fpos;
       
   542               if ( edge_delta < 0 )
       
   543                 edge_delta = -edge_delta;
       
   544 
       
   545               seg_delta = AF_SEGMENT_DIST( seg, seg2 );
       
   546 
       
   547               if ( seg_delta < edge_delta )
       
   548                 edge2 = seg2->edge;
       
   549             }
       
   550             else
       
   551               edge2 = seg2->edge;
       
   552 
       
   553             if ( is_serif )
       
   554             {
       
   555               edge->serif   = edge2;
       
   556               edge2->flags |= AF_EDGE_SERIF;
       
   557             }
       
   558             else
       
   559               edge->link  = edge2;
       
   560           }
       
   561 
       
   562           seg = seg->edge_next;
       
   563 
       
   564         } while ( seg != edge->first );
       
   565 
       
   566         /* set the round/straight flags */
       
   567         edge->flags = AF_EDGE_NORMAL;
       
   568 
       
   569         if ( is_round > 0 && is_round >= is_straight )
       
   570           edge->flags |= AF_EDGE_ROUND;
       
   571 
       
   572         /* get rid of serifs if link is set                 */
       
   573         /* XXX: This gets rid of many unpleasant artefacts! */
       
   574         /*      Example: the `c' in cour.pfa at size 13     */
       
   575 
       
   576         if ( edge->serif && edge->link )
       
   577           edge->serif = 0;
       
   578       }
       
   579     }
       
   580 
       
   581   Exit:
       
   582     return error;
       
   583   }
       
   584 
       
   585 
       
   586   static FT_Error
       
   587   af_cjk_hints_detect_features( AF_GlyphHints  hints,
       
   588                                 AF_Dimension   dim )
       
   589   {
       
   590     FT_Error  error;
       
   591 
       
   592 
       
   593     error = af_cjk_hints_compute_segments( hints, dim );
       
   594     if ( !error )
       
   595     {
       
   596       af_cjk_hints_link_segments( hints, dim );
       
   597 
       
   598       error = af_cjk_hints_compute_edges( hints, dim );
       
   599     }
       
   600     return error;
       
   601   }
       
   602 
       
   603 
       
   604   FT_LOCAL_DEF( FT_Error )
       
   605   af_cjk_hints_init( AF_GlyphHints    hints,
       
   606                      AF_LatinMetrics  metrics )
       
   607   {
       
   608     FT_Render_Mode  mode;
       
   609     FT_UInt32       scaler_flags, other_flags;
       
   610 
       
   611 
       
   612     af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
       
   613 
       
   614     /*
       
   615      *  correct x_scale and y_scale when needed, since they may have
       
   616      *  been modified af_cjk_scale_dim above
       
   617      */
       
   618     hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
       
   619     hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
       
   620     hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
       
   621     hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
       
   622 
       
   623     /* compute flags depending on render mode, etc. */
       
   624     mode = metrics->root.scaler.render_mode;
       
   625 
       
   626 #ifdef AF_CONFIG_OPTION_USE_WARPER
       
   627     if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
       
   628       metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
       
   629 #endif
       
   630 
       
   631     scaler_flags = hints->scaler_flags;
       
   632     other_flags  = 0;
       
   633 
       
   634     /*
       
   635      *  We snap the width of vertical stems for the monochrome and
       
   636      *  horizontal LCD rendering targets only.
       
   637      */
       
   638     if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
       
   639       other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
       
   640 
       
   641     /*
       
   642      *  We snap the width of horizontal stems for the monochrome and
       
   643      *  vertical LCD rendering targets only.
       
   644      */
       
   645     if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
       
   646       other_flags |= AF_LATIN_HINTS_VERT_SNAP;
       
   647 
       
   648     /*
       
   649      *  We adjust stems to full pixels only if we don't use the `light' mode.
       
   650      */
       
   651     if ( mode != FT_RENDER_MODE_LIGHT )
       
   652       other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
       
   653 
       
   654     if ( mode == FT_RENDER_MODE_MONO )
       
   655       other_flags |= AF_LATIN_HINTS_MONO;
       
   656 
       
   657     scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
       
   658 
       
   659     hints->scaler_flags = scaler_flags;
       
   660     hints->other_flags  = other_flags;
       
   661 
       
   662     return 0;
       
   663   }
       
   664 
       
   665 
       
   666   /*************************************************************************/
       
   667   /*************************************************************************/
       
   668   /*****                                                               *****/
       
   669   /*****          C J K   G L Y P H   G R I D - F I T T I N G          *****/
       
   670   /*****                                                               *****/
       
   671   /*************************************************************************/
       
   672   /*************************************************************************/
       
   673 
       
   674   /* snap a given width in scaled coordinates to one of the */
       
   675   /* current standard widths                                */
       
   676 
       
   677   static FT_Pos
       
   678   af_cjk_snap_width( AF_Width  widths,
       
   679                      FT_Int    count,
       
   680                      FT_Pos    width )
       
   681   {
       
   682     int     n;
       
   683     FT_Pos  best      = 64 + 32 + 2;
       
   684     FT_Pos  reference = width;
       
   685     FT_Pos  scaled;
       
   686 
       
   687 
       
   688     for ( n = 0; n < count; n++ )
       
   689     {
       
   690       FT_Pos  w;
       
   691       FT_Pos  dist;
       
   692 
       
   693 
       
   694       w = widths[n].cur;
       
   695       dist = width - w;
       
   696       if ( dist < 0 )
       
   697         dist = -dist;
       
   698       if ( dist < best )
       
   699       {
       
   700         best      = dist;
       
   701         reference = w;
       
   702       }
       
   703     }
       
   704 
       
   705     scaled = FT_PIX_ROUND( reference );
       
   706 
       
   707     if ( width >= reference )
       
   708     {
       
   709       if ( width < scaled + 48 )
       
   710         width = reference;
       
   711     }
       
   712     else
       
   713     {
       
   714       if ( width > scaled - 48 )
       
   715         width = reference;
       
   716     }
       
   717 
       
   718     return width;
       
   719   }
       
   720 
       
   721 
       
   722   /* compute the snapped width of a given stem */
       
   723 
       
   724   static FT_Pos
       
   725   af_cjk_compute_stem_width( AF_GlyphHints  hints,
       
   726                              AF_Dimension   dim,
       
   727                              FT_Pos         width,
       
   728                              AF_Edge_Flags  base_flags,
       
   729                              AF_Edge_Flags  stem_flags )
       
   730   {
       
   731     AF_LatinMetrics  metrics  = (AF_LatinMetrics) hints->metrics;
       
   732     AF_LatinAxis     axis     = & metrics->axis[dim];
       
   733     FT_Pos           dist     = width;
       
   734     FT_Int           sign     = 0;
       
   735     FT_Int           vertical = ( dim == AF_DIMENSION_VERT );
       
   736 
       
   737     FT_UNUSED( base_flags );
       
   738     FT_UNUSED( stem_flags );
       
   739 
       
   740 
       
   741     if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
       
   742       return width;
       
   743 
       
   744     if ( dist < 0 )
       
   745     {
       
   746       dist = -width;
       
   747       sign = 1;
       
   748     }
       
   749 
       
   750     if ( (  vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
       
   751          ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
       
   752     {
       
   753       /* smooth hinting process: very lightly quantize the stem width */
       
   754 
       
   755       if ( axis->width_count > 0 )
       
   756       {
       
   757         if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )
       
   758         {
       
   759           dist = axis->widths[0].cur;
       
   760           if ( dist < 48 )
       
   761             dist = 48;
       
   762 
       
   763           goto Done_Width;
       
   764         }
       
   765       }
       
   766 
       
   767       if ( dist < 54 )
       
   768         dist += ( 54 - dist ) / 2 ;
       
   769       else if ( dist < 3 * 64 )
       
   770       {
       
   771         FT_Pos  delta;
       
   772 
       
   773 
       
   774         delta  = dist & 63;
       
   775         dist  &= -64;
       
   776 
       
   777         if ( delta < 10 )
       
   778           dist += delta;
       
   779         else if ( delta < 22 )
       
   780           dist += 10;
       
   781         else if ( delta < 42 )
       
   782           dist += delta;
       
   783         else if ( delta < 54 )
       
   784           dist += 54;
       
   785         else
       
   786           dist += delta;
       
   787       }
       
   788     }
       
   789     else
       
   790     {
       
   791       /* strong hinting process: snap the stem width to integer pixels */
       
   792 
       
   793       dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );
       
   794 
       
   795       if ( vertical )
       
   796       {
       
   797         /* in the case of vertical hinting, always round */
       
   798         /* the stem heights to integer pixels            */
       
   799 
       
   800         if ( dist >= 64 )
       
   801           dist = ( dist + 16 ) & ~63;
       
   802         else
       
   803           dist = 64;
       
   804       }
       
   805       else
       
   806       {
       
   807         if ( AF_LATIN_HINTS_DO_MONO( hints ) )
       
   808         {
       
   809           /* monochrome horizontal hinting: snap widths to integer pixels */
       
   810           /* with a different threshold                                   */
       
   811 
       
   812           if ( dist < 64 )
       
   813             dist = 64;
       
   814           else
       
   815             dist = ( dist + 32 ) & ~63;
       
   816         }
       
   817         else
       
   818         {
       
   819           /* for horizontal anti-aliased hinting, we adopt a more subtle */
       
   820           /* approach: we strengthen small stems, round stems whose size */
       
   821           /* is between 1 and 2 pixels to an integer, otherwise nothing  */
       
   822 
       
   823           if ( dist < 48 )
       
   824             dist = ( dist + 64 ) >> 1;
       
   825 
       
   826           else if ( dist < 128 )
       
   827             dist = ( dist + 22 ) & ~63;
       
   828           else
       
   829             /* round otherwise to prevent color fringes in LCD mode */
       
   830             dist = ( dist + 32 ) & ~63;
       
   831         }
       
   832       }
       
   833     }
       
   834 
       
   835   Done_Width:
       
   836     if ( sign )
       
   837       dist = -dist;
       
   838 
       
   839     return dist;
       
   840   }
       
   841 
       
   842 
       
   843   /* align one stem edge relative to the previous stem edge */
       
   844 
       
   845   static void
       
   846   af_cjk_align_linked_edge( AF_GlyphHints  hints,
       
   847                             AF_Dimension   dim,
       
   848                             AF_Edge        base_edge,
       
   849                             AF_Edge        stem_edge )
       
   850   {
       
   851     FT_Pos  dist = stem_edge->opos - base_edge->opos;
       
   852 
       
   853     FT_Pos  fitted_width = af_cjk_compute_stem_width(
       
   854                              hints, dim, dist,
       
   855                              (AF_Edge_Flags)base_edge->flags,
       
   856                              (AF_Edge_Flags)stem_edge->flags );
       
   857 
       
   858 
       
   859     stem_edge->pos = base_edge->pos + fitted_width;
       
   860   }
       
   861 
       
   862 
       
   863   static void
       
   864   af_cjk_align_serif_edge( AF_GlyphHints  hints,
       
   865                            AF_Edge        base,
       
   866                            AF_Edge        serif )
       
   867   {
       
   868     FT_UNUSED( hints );
       
   869 
       
   870     serif->pos = base->pos + ( serif->opos - base->opos );
       
   871   }
       
   872 
       
   873 
       
   874   /*************************************************************************/
       
   875   /*************************************************************************/
       
   876   /*************************************************************************/
       
   877   /****                                                                 ****/
       
   878   /****                    E D G E   H I N T I N G                      ****/
       
   879   /****                                                                 ****/
       
   880   /*************************************************************************/
       
   881   /*************************************************************************/
       
   882   /*************************************************************************/
       
   883 
       
   884 
       
   885 #define AF_LIGHT_MODE_MAX_HORZ_GAP    9
       
   886 #define AF_LIGHT_MODE_MAX_VERT_GAP   15
       
   887 #define AF_LIGHT_MODE_MAX_DELTA_ABS  14
       
   888 
       
   889 
       
   890   static FT_Pos
       
   891   af_hint_normal_stem( AF_GlyphHints  hints,
       
   892                        AF_Edge        edge,
       
   893                        AF_Edge        edge2,
       
   894                        FT_Pos         anchor,
       
   895                        AF_Dimension   dim )
       
   896   {
       
   897     FT_Pos  org_len, cur_len, org_center;
       
   898     FT_Pos  cur_pos1, cur_pos2;
       
   899     FT_Pos  d_off1, u_off1, d_off2, u_off2, delta;
       
   900     FT_Pos  offset;
       
   901     FT_Pos  threshold = 64;
       
   902 
       
   903 
       
   904     if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
       
   905     {
       
   906       if ( ( edge->flags  & AF_EDGE_ROUND ) &&
       
   907            ( edge2->flags & AF_EDGE_ROUND ) )
       
   908       {
       
   909         if ( dim == AF_DIMENSION_VERT )
       
   910           threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;
       
   911         else
       
   912           threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;
       
   913       }
       
   914       else
       
   915       {
       
   916         if ( dim == AF_DIMENSION_VERT )
       
   917           threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;
       
   918         else
       
   919           threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;
       
   920       }
       
   921     }
       
   922 
       
   923     org_len    = edge2->opos - edge->opos;
       
   924     cur_len    = af_cjk_compute_stem_width( hints, dim, org_len,
       
   925                                             (AF_Edge_Flags)edge->flags,
       
   926                                             (AF_Edge_Flags)edge2->flags );
       
   927 
       
   928     org_center = ( edge->opos + edge2->opos ) / 2 + anchor;
       
   929     cur_pos1   = org_center - cur_len / 2;
       
   930     cur_pos2   = cur_pos1 + cur_len;
       
   931     d_off1     = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );
       
   932     d_off2     = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );
       
   933     u_off1     = 64 - d_off1;
       
   934     u_off2     = 64 - d_off2;
       
   935     delta      = 0;
       
   936 
       
   937 
       
   938     if ( d_off1 == 0 || d_off2 == 0 )
       
   939       goto Exit;
       
   940 
       
   941     if ( cur_len <= threshold )
       
   942     {
       
   943       if ( d_off2 < cur_len )
       
   944       {
       
   945         if ( u_off1 <= d_off2 )
       
   946           delta =  u_off1;
       
   947         else
       
   948           delta = -d_off2;
       
   949       }
       
   950 
       
   951       goto Exit;
       
   952     }
       
   953 
       
   954     if ( threshold < 64 )
       
   955     {
       
   956       if ( d_off1 >= threshold || u_off1 >= threshold ||
       
   957            d_off2 >= threshold || u_off2 >= threshold )
       
   958         goto Exit;
       
   959     }
       
   960 
       
   961     offset = cur_len % 64;
       
   962 
       
   963     if ( offset < 32 )
       
   964     {
       
   965       if ( u_off1 <= offset || d_off2 <= offset )
       
   966         goto Exit;
       
   967     }
       
   968     else
       
   969       offset = 64 - threshold;
       
   970 
       
   971     d_off1 = threshold - u_off1;
       
   972     u_off1 = u_off1    - offset;
       
   973     u_off2 = threshold - d_off2;
       
   974     d_off2 = d_off2    - offset;
       
   975 
       
   976     if ( d_off1 <= u_off1 )
       
   977       u_off1 = -d_off1;
       
   978 
       
   979     if ( d_off2 <= u_off2 )
       
   980       u_off2 = -d_off2;
       
   981 
       
   982     if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )
       
   983       delta = u_off1;
       
   984     else
       
   985       delta = u_off2;
       
   986 
       
   987   Exit:
       
   988 
       
   989 #if 1
       
   990     if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
       
   991     {
       
   992       if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )
       
   993         delta = AF_LIGHT_MODE_MAX_DELTA_ABS;
       
   994       else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )
       
   995         delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;
       
   996     }
       
   997 #endif
       
   998 
       
   999     cur_pos1 += delta;
       
  1000 
       
  1001     if ( edge->opos < edge2->opos )
       
  1002     {
       
  1003       edge->pos  = cur_pos1;
       
  1004       edge2->pos = cur_pos1 + cur_len;
       
  1005     }
       
  1006     else
       
  1007     {
       
  1008       edge->pos  = cur_pos1 + cur_len;
       
  1009       edge2->pos = cur_pos1;
       
  1010     }
       
  1011 
       
  1012     return delta;
       
  1013   }
       
  1014 
       
  1015 
       
  1016   static void
       
  1017   af_cjk_hint_edges( AF_GlyphHints  hints,
       
  1018                      AF_Dimension   dim )
       
  1019   {
       
  1020     AF_AxisHints  axis       = &hints->axis[dim];
       
  1021     AF_Edge       edges      = axis->edges;
       
  1022     AF_Edge       edge_limit = edges + axis->num_edges;
       
  1023     FT_PtrDist    n_edges;
       
  1024     AF_Edge       edge;
       
  1025     AF_Edge       anchor   = 0;
       
  1026     FT_Pos        delta    = 0;
       
  1027     FT_Int        skipped  = 0;
       
  1028     FT_Bool       has_last_stem = FALSE;
       
  1029     FT_Pos        last_stem_pos = 0;
       
  1030 
       
  1031 
       
  1032     /* now we align all stem edges. */
       
  1033     for ( edge = edges; edge < edge_limit; edge++ )
       
  1034     {
       
  1035       AF_Edge  edge2;
       
  1036 
       
  1037 
       
  1038       if ( edge->flags & AF_EDGE_DONE )
       
  1039         continue;
       
  1040 
       
  1041       /* skip all non-stem edges */
       
  1042       edge2 = edge->link;
       
  1043       if ( !edge2 )
       
  1044       {
       
  1045         skipped++;
       
  1046         continue;
       
  1047       }
       
  1048 
       
  1049       /* Some CJK characters have so many stems that
       
  1050        * the hinter is likely to merge two adjacent ones.
       
  1051        * To solve this problem, if either edge of a stem
       
  1052        * is too close to the previous one, we avoid
       
  1053        * aligning the two edges, but rather interpolate
       
  1054        * their locations at the end of this function in
       
  1055        * order to preserve the space between the stems.
       
  1056        */
       
  1057       if ( has_last_stem                       &&
       
  1058            ( edge->pos  < last_stem_pos + 64 ||
       
  1059              edge2->pos < last_stem_pos + 64 ) )
       
  1060       {
       
  1061         skipped++;
       
  1062         continue;
       
  1063       }
       
  1064 
       
  1065       /* now align the stem */
       
  1066 
       
  1067       if ( edge2 < edge )
       
  1068       {
       
  1069         af_cjk_align_linked_edge( hints, dim, edge2, edge );
       
  1070         edge->flags |= AF_EDGE_DONE;
       
  1071         /* We rarely reaches here it seems;
       
  1072          * usually the two edges belonging
       
  1073          * to one stem are marked as DONE together
       
  1074          */
       
  1075         has_last_stem = TRUE;
       
  1076         last_stem_pos = edge->pos;
       
  1077         continue;
       
  1078       }
       
  1079 
       
  1080       if ( dim != AF_DIMENSION_VERT && !anchor )
       
  1081       {
       
  1082 
       
  1083 #if 0
       
  1084         if ( fixedpitch )
       
  1085         {
       
  1086           AF_Edge     left  = edge;
       
  1087           AF_Edge     right = edge_limit - 1;
       
  1088           AF_EdgeRec  left1, left2, right1, right2;
       
  1089           FT_Pos      target, center1, center2;
       
  1090           FT_Pos      delta1, delta2, d1, d2;
       
  1091 
       
  1092 
       
  1093           while ( right > left && !right->link )
       
  1094             right--;
       
  1095 
       
  1096           left1  = *left;
       
  1097           left2  = *left->link;
       
  1098           right1 = *right->link;
       
  1099           right2 = *right;
       
  1100 
       
  1101           delta  = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
       
  1102           target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;
       
  1103 
       
  1104           delta1  = delta;
       
  1105           delta1 += af_hint_normal_stem( hints, left, left->link,
       
  1106                                          delta1, 0 );
       
  1107 
       
  1108           if ( left->link != right )
       
  1109             af_hint_normal_stem( hints, right->link, right, delta1, 0 );
       
  1110 
       
  1111           center1 = left->pos + ( right->pos - left->pos ) / 2;
       
  1112 
       
  1113           if ( center1 >= target )
       
  1114             delta2 = delta - 32;
       
  1115           else
       
  1116             delta2 = delta + 32;
       
  1117 
       
  1118           delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );
       
  1119 
       
  1120           if ( delta1 != delta2 )
       
  1121           {
       
  1122             if ( left->link != right )
       
  1123               af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );
       
  1124 
       
  1125             center2 = left1.pos + ( right2.pos - left1.pos ) / 2;
       
  1126 
       
  1127             d1 = center1 - target;
       
  1128             d2 = center2 - target;
       
  1129 
       
  1130             if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
       
  1131             {
       
  1132               left->pos       = left1.pos;
       
  1133               left->link->pos = left2.pos;
       
  1134 
       
  1135               if ( left->link != right )
       
  1136               {
       
  1137                 right->link->pos = right1.pos;
       
  1138                 right->pos       = right2.pos;
       
  1139               }
       
  1140 
       
  1141               delta1 = delta2;
       
  1142             }
       
  1143           }
       
  1144 
       
  1145           delta               = delta1;
       
  1146           right->link->flags |= AF_EDGE_DONE;
       
  1147           right->flags       |= AF_EDGE_DONE;
       
  1148         }
       
  1149         else
       
  1150 
       
  1151 #endif /* 0 */
       
  1152 
       
  1153           delta = af_hint_normal_stem( hints, edge, edge2, 0,
       
  1154                                        AF_DIMENSION_HORZ );
       
  1155       }
       
  1156       else
       
  1157         af_hint_normal_stem( hints, edge, edge2, delta, dim );
       
  1158 
       
  1159 #if 0
       
  1160       printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
       
  1161                edge - edges, edge2 - edges,
       
  1162                ( edge->pos - edge->opos ) / 64.0,
       
  1163                ( edge2->pos - edge2->opos ) / 64.0 );
       
  1164 #endif
       
  1165 
       
  1166       anchor = edge;
       
  1167       edge->flags  |= AF_EDGE_DONE;
       
  1168       edge2->flags |= AF_EDGE_DONE;
       
  1169       has_last_stem = TRUE;
       
  1170       last_stem_pos = edge2->pos;
       
  1171     }
       
  1172 
       
  1173     /* make sure that lowercase m's maintain their symmetry */
       
  1174 
       
  1175     /* In general, lowercase m's have six vertical edges if they are sans */
       
  1176     /* serif, or twelve if they are with serifs.  This implementation is  */
       
  1177     /* based on that assumption, and seems to work very well with most    */
       
  1178     /* faces.  However, if for a certain face this assumption is not      */
       
  1179     /* true, the m is just rendered like before.  In addition, any stem   */
       
  1180     /* correction will only be applied to symmetrical glyphs (even if the */
       
  1181     /* glyph is not an m), so the potential for unwanted distortion is    */
       
  1182     /* relatively low.                                                    */
       
  1183 
       
  1184     /* We don't handle horizontal edges since we can't easily assure that */
       
  1185     /* the third (lowest) stem aligns with the base line; it might end up */
       
  1186     /* one pixel higher or lower.                                         */
       
  1187 
       
  1188     n_edges = edge_limit - edges;
       
  1189     if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
       
  1190     {
       
  1191       AF_Edge  edge1, edge2, edge3;
       
  1192       FT_Pos   dist1, dist2, span;
       
  1193 
       
  1194 
       
  1195       if ( n_edges == 6 )
       
  1196       {
       
  1197         edge1 = edges;
       
  1198         edge2 = edges + 2;
       
  1199         edge3 = edges + 4;
       
  1200       }
       
  1201       else
       
  1202       {
       
  1203         edge1 = edges + 1;
       
  1204         edge2 = edges + 5;
       
  1205         edge3 = edges + 9;
       
  1206       }
       
  1207 
       
  1208       dist1 = edge2->opos - edge1->opos;
       
  1209       dist2 = edge3->opos - edge2->opos;
       
  1210 
       
  1211       span = dist1 - dist2;
       
  1212       if ( span < 0 )
       
  1213         span = -span;
       
  1214 
       
  1215       if ( edge1->link == edge1 + 1 &&
       
  1216            edge2->link == edge2 + 1 &&
       
  1217            edge3->link == edge3 + 1 && span < 8 )
       
  1218       {
       
  1219         delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
       
  1220         edge3->pos -= delta;
       
  1221         if ( edge3->link )
       
  1222           edge3->link->pos -= delta;
       
  1223 
       
  1224         /* move the serifs along with the stem */
       
  1225         if ( n_edges == 12 )
       
  1226         {
       
  1227           ( edges + 8 )->pos -= delta;
       
  1228           ( edges + 11 )->pos -= delta;
       
  1229         }
       
  1230 
       
  1231         edge3->flags |= AF_EDGE_DONE;
       
  1232         if ( edge3->link )
       
  1233           edge3->link->flags |= AF_EDGE_DONE;
       
  1234       }
       
  1235     }
       
  1236 
       
  1237     if ( !skipped )
       
  1238       return;
       
  1239 
       
  1240     /*
       
  1241      *  now hint the remaining edges (serifs and single) in order
       
  1242      *  to complete our processing
       
  1243      */
       
  1244     for ( edge = edges; edge < edge_limit; edge++ )
       
  1245     {
       
  1246       if ( edge->flags & AF_EDGE_DONE )
       
  1247         continue;
       
  1248 
       
  1249       if ( edge->serif )
       
  1250       {
       
  1251         af_cjk_align_serif_edge( hints, edge->serif, edge );
       
  1252         edge->flags |= AF_EDGE_DONE;
       
  1253         skipped--;
       
  1254       }
       
  1255     }
       
  1256 
       
  1257     if ( !skipped )
       
  1258       return;
       
  1259 
       
  1260     for ( edge = edges; edge < edge_limit; edge++ )
       
  1261     {
       
  1262       AF_Edge  before, after;
       
  1263 
       
  1264 
       
  1265       if ( edge->flags & AF_EDGE_DONE )
       
  1266         continue;
       
  1267 
       
  1268       before = after = edge;
       
  1269 
       
  1270       while ( --before >= edges )
       
  1271         if ( before->flags & AF_EDGE_DONE )
       
  1272           break;
       
  1273 
       
  1274       while ( ++after < edge_limit )
       
  1275         if ( after->flags & AF_EDGE_DONE )
       
  1276           break;
       
  1277 
       
  1278       if ( before >= edges || after < edge_limit )
       
  1279       {
       
  1280         if ( before < edges )
       
  1281           af_cjk_align_serif_edge( hints, after, edge );
       
  1282         else if ( after >= edge_limit )
       
  1283           af_cjk_align_serif_edge( hints, before, edge );
       
  1284         else
       
  1285         {
       
  1286           if ( after->fpos == before->fpos )
       
  1287             edge->pos = before->pos;
       
  1288           else
       
  1289             edge->pos = before->pos +
       
  1290                         FT_MulDiv( edge->fpos - before->fpos,
       
  1291                                    after->pos - before->pos,
       
  1292                                    after->fpos - before->fpos );
       
  1293         }
       
  1294       }
       
  1295     }
       
  1296   }
       
  1297 
       
  1298 
       
  1299   static void
       
  1300   af_cjk_align_edge_points( AF_GlyphHints  hints,
       
  1301                             AF_Dimension   dim )
       
  1302   {
       
  1303     AF_AxisHints  axis       = & hints->axis[dim];
       
  1304     AF_Edge       edges      = axis->edges;
       
  1305     AF_Edge       edge_limit = edges + axis->num_edges;
       
  1306     AF_Edge       edge;
       
  1307     FT_Bool       snapping;
       
  1308 
       
  1309 
       
  1310     snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ             &&
       
  1311                           AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) )  ||
       
  1312                         ( dim == AF_DIMENSION_VERT             &&
       
  1313                           AF_LATIN_HINTS_DO_VERT_SNAP( hints ) )  );
       
  1314 
       
  1315     for ( edge = edges; edge < edge_limit; edge++ )
       
  1316     {
       
  1317       /* move the points of each segment     */
       
  1318       /* in each edge to the edge's position */
       
  1319       AF_Segment  seg = edge->first;
       
  1320 
       
  1321 
       
  1322       if ( snapping )
       
  1323       {
       
  1324         do
       
  1325         {
       
  1326           AF_Point  point = seg->first;
       
  1327 
       
  1328 
       
  1329           for (;;)
       
  1330           {
       
  1331             if ( dim == AF_DIMENSION_HORZ )
       
  1332             {
       
  1333               point->x      = edge->pos;
       
  1334               point->flags |= AF_FLAG_TOUCH_X;
       
  1335             }
       
  1336             else
       
  1337             {
       
  1338               point->y      = edge->pos;
       
  1339               point->flags |= AF_FLAG_TOUCH_Y;
       
  1340             }
       
  1341 
       
  1342             if ( point == seg->last )
       
  1343               break;
       
  1344 
       
  1345             point = point->next;
       
  1346           }
       
  1347 
       
  1348           seg = seg->edge_next;
       
  1349 
       
  1350         } while ( seg != edge->first );
       
  1351       }
       
  1352       else
       
  1353       {
       
  1354         FT_Pos  delta = edge->pos - edge->opos;
       
  1355 
       
  1356 
       
  1357         do
       
  1358         {
       
  1359           AF_Point  point = seg->first;
       
  1360 
       
  1361 
       
  1362           for (;;)
       
  1363           {
       
  1364             if ( dim == AF_DIMENSION_HORZ )
       
  1365             {
       
  1366               point->x     += delta;
       
  1367               point->flags |= AF_FLAG_TOUCH_X;
       
  1368             }
       
  1369             else
       
  1370             {
       
  1371               point->y     += delta;
       
  1372               point->flags |= AF_FLAG_TOUCH_Y;
       
  1373             }
       
  1374 
       
  1375             if ( point == seg->last )
       
  1376               break;
       
  1377 
       
  1378             point = point->next;
       
  1379           }
       
  1380 
       
  1381           seg = seg->edge_next;
       
  1382 
       
  1383         } while ( seg != edge->first );
       
  1384       }
       
  1385     }
       
  1386   }
       
  1387 
       
  1388 
       
  1389   FT_LOCAL_DEF( FT_Error )
       
  1390   af_cjk_hints_apply( AF_GlyphHints    hints,
       
  1391                       FT_Outline*      outline,
       
  1392                       AF_LatinMetrics  metrics )
       
  1393   {
       
  1394     FT_Error  error;
       
  1395     int       dim;
       
  1396 
       
  1397     FT_UNUSED( metrics );
       
  1398 
       
  1399 
       
  1400     error = af_glyph_hints_reload( hints, outline );
       
  1401     if ( error )
       
  1402       goto Exit;
       
  1403 
       
  1404     /* analyze glyph outline */
       
  1405     if ( AF_HINTS_DO_HORIZONTAL( hints ) )
       
  1406     {
       
  1407       error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
       
  1408       if ( error )
       
  1409         goto Exit;
       
  1410     }
       
  1411 
       
  1412     if ( AF_HINTS_DO_VERTICAL( hints ) )
       
  1413     {
       
  1414       error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
       
  1415       if ( error )
       
  1416         goto Exit;
       
  1417     }
       
  1418 
       
  1419     /* grid-fit the outline */
       
  1420     for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
       
  1421     {
       
  1422       if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
       
  1423            ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) )   )
       
  1424       {
       
  1425 
       
  1426 #ifdef AF_CONFIG_OPTION_USE_WARPER
       
  1427         if ( dim == AF_DIMENSION_HORZ                                  &&
       
  1428              metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL )
       
  1429         {
       
  1430           AF_WarperRec  warper;
       
  1431           FT_Fixed      scale;
       
  1432           FT_Pos        delta;
       
  1433 
       
  1434 
       
  1435           af_warper_compute( &warper, hints, (AF_Dimension)dim,
       
  1436                              &scale, &delta );
       
  1437           af_glyph_hints_scale_dim( hints, (AF_Dimension)dim,
       
  1438                                     scale, delta );
       
  1439           continue;
       
  1440         }
       
  1441 #endif /* AF_CONFIG_OPTION_USE_WARPER */
       
  1442 
       
  1443         af_cjk_hint_edges( hints, (AF_Dimension)dim );
       
  1444         af_cjk_align_edge_points( hints, (AF_Dimension)dim );
       
  1445         af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
       
  1446         af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
       
  1447       }
       
  1448     }
       
  1449 
       
  1450 #if 0
       
  1451     af_glyph_hints_dump_points( hints );
       
  1452     af_glyph_hints_dump_segments( hints );
       
  1453     af_glyph_hints_dump_edges( hints );
       
  1454 #endif
       
  1455 
       
  1456     af_glyph_hints_save( hints, outline );
       
  1457 
       
  1458   Exit:
       
  1459     return error;
       
  1460   }
       
  1461 
       
  1462 
       
  1463   /*************************************************************************/
       
  1464   /*************************************************************************/
       
  1465   /*****                                                               *****/
       
  1466   /*****                C J K   S C R I P T   C L A S S                *****/
       
  1467   /*****                                                               *****/
       
  1468   /*************************************************************************/
       
  1469   /*************************************************************************/
       
  1470 
       
  1471 
       
  1472   /* this corresponds to Unicode 6.0 */
       
  1473 
       
  1474   static const AF_Script_UniRangeRec  af_cjk_uniranges[] =
       
  1475   {
       
  1476     AF_UNIRANGE_REC(  0x2E80UL,  0x2EFFUL ),  /* CJK Radicals Supplement                 */
       
  1477     AF_UNIRANGE_REC(  0x2F00UL,  0x2FDFUL ),  /* Kangxi Radicals                         */
       
  1478     AF_UNIRANGE_REC(  0x2FF0UL,  0x2FFFUL ),  /* Ideographic Description Characters      */
       
  1479     AF_UNIRANGE_REC(  0x3000UL,  0x303FUL ),  /* CJK Symbols and Punctuation             */
       
  1480     AF_UNIRANGE_REC(  0x3040UL,  0x309FUL ),  /* Hiragana                                */
       
  1481     AF_UNIRANGE_REC(  0x30A0UL,  0x30FFUL ),  /* Katakana                                */
       
  1482     AF_UNIRANGE_REC(  0x3100UL,  0x312FUL ),  /* Bopomofo                                */
       
  1483     AF_UNIRANGE_REC(  0x3130UL,  0x318FUL ),  /* Hangul Compatibility Jamo               */
       
  1484     AF_UNIRANGE_REC(  0x3190UL,  0x319FUL ),  /* Kanbun                                  */
       
  1485     AF_UNIRANGE_REC(  0x31A0UL,  0x31BFUL ),  /* Bopomofo Extended                       */
       
  1486     AF_UNIRANGE_REC(  0x31C0UL,  0x31EFUL ),  /* CJK Strokes                             */
       
  1487     AF_UNIRANGE_REC(  0x31F0UL,  0x31FFUL ),  /* Katakana Phonetic Extensions            */
       
  1488     AF_UNIRANGE_REC(  0x3200UL,  0x32FFUL ),  /* Enclosed CJK Letters and Months         */
       
  1489     AF_UNIRANGE_REC(  0x3300UL,  0x33FFUL ),  /* CJK Compatibility                       */
       
  1490     AF_UNIRANGE_REC(  0x3400UL,  0x4DBFUL ),  /* CJK Unified Ideographs Extension A      */
       
  1491     AF_UNIRANGE_REC(  0x4DC0UL,  0x4DFFUL ),  /* Yijing Hexagram Symbols                 */
       
  1492     AF_UNIRANGE_REC(  0x4E00UL,  0x9FFFUL ),  /* CJK Unified Ideographs                  */
       
  1493     AF_UNIRANGE_REC(  0xA960UL,  0xA97FUL ),  /* Hangul Jamo Extended-A                  */
       
  1494     AF_UNIRANGE_REC(  0xAC00UL,  0xD7AFUL ),  /* Hangul Syllables                        */
       
  1495     AF_UNIRANGE_REC(  0xD7B0UL,  0xD7FFUL ),  /* Hangul Jamo Extended-B                  */
       
  1496     AF_UNIRANGE_REC(  0xF900UL,  0xFAFFUL ),  /* CJK Compatibility Ideographs            */
       
  1497     AF_UNIRANGE_REC(  0xFE10UL,  0xFE1FUL ),  /* Vertical forms                          */
       
  1498     AF_UNIRANGE_REC(  0xFE30UL,  0xFE4FUL ),  /* CJK Compatibility Forms                 */
       
  1499     AF_UNIRANGE_REC(  0xFF00UL,  0xFFEFUL ),  /* Halfwidth and Fullwidth Forms           */
       
  1500     AF_UNIRANGE_REC( 0x1B000UL, 0x1B0FFUL ),  /* Kana Supplement                         */
       
  1501     AF_UNIRANGE_REC( 0x1D300UL, 0x1D35FUL ),  /* Tai Xuan Hing Symbols                   */
       
  1502     AF_UNIRANGE_REC( 0x1F200UL, 0x1F2FFUL ),  /* Enclosed Ideographic Supplement         */
       
  1503     AF_UNIRANGE_REC( 0x20000UL, 0x2A6DFUL ),  /* CJK Unified Ideographs Extension B      */
       
  1504     AF_UNIRANGE_REC( 0x2A700UL, 0x2B73FUL ),  /* CJK Unified Ideographs Extension C      */
       
  1505     AF_UNIRANGE_REC( 0x2B740UL, 0x2B81FUL ),  /* CJK Unified Ideographs Extension D      */
       
  1506     AF_UNIRANGE_REC( 0x2F800UL, 0x2FA1FUL ),  /* CJK Compatibility Ideographs Supplement */
       
  1507     AF_UNIRANGE_REC(       0UL,       0UL )
       
  1508   };
       
  1509 
       
  1510 
       
  1511   AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class,
       
  1512     AF_SCRIPT_CJK,
       
  1513     af_cjk_uniranges,
       
  1514 
       
  1515     sizeof( AF_LatinMetricsRec ),
       
  1516 
       
  1517     (AF_Script_InitMetricsFunc) af_cjk_metrics_init,
       
  1518     (AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale,
       
  1519     (AF_Script_DoneMetricsFunc) NULL,
       
  1520 
       
  1521     (AF_Script_InitHintsFunc)   af_cjk_hints_init,
       
  1522     (AF_Script_ApplyHintsFunc)  af_cjk_hints_apply
       
  1523   )
       
  1524 
       
  1525 #else /* !AF_CONFIG_OPTION_CJK */
       
  1526 
       
  1527   static const AF_Script_UniRangeRec  af_cjk_uniranges[] =
       
  1528   {
       
  1529     AF_UNIRANGE_REC( 0UL, 0UL )
       
  1530   };
       
  1531 
       
  1532 
       
  1533   AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class,
       
  1534     AF_SCRIPT_CJK,
       
  1535     af_cjk_uniranges,
       
  1536 
       
  1537     sizeof( AF_LatinMetricsRec ),
       
  1538 
       
  1539     (AF_Script_InitMetricsFunc) NULL,
       
  1540     (AF_Script_ScaleMetricsFunc)NULL,
       
  1541     (AF_Script_DoneMetricsFunc) NULL,
       
  1542 
       
  1543     (AF_Script_InitHintsFunc)   NULL,
       
  1544     (AF_Script_ApplyHintsFunc)  NULL
       
  1545   )
       
  1546 
       
  1547 #endif /* !AF_CONFIG_OPTION_CJK */
       
  1548 
       
  1549 
       
  1550 /* END */