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      1 /***************************************************************************/
      2 /*                                                                         */
      3 /*  afcjk.c                                                                */
      4 /*                                                                         */
      5 /*    Auto-fitter hinting routines for CJK script (body).                  */
      6 /*                                                                         */
      7 /*  Copyright 2006-2012 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 <ft2build.h>
     26 #include FT_ADVANCES_H
     27 #include FT_INTERNAL_DEBUG_H
     28 
     29 #include "aftypes.h"
     30 #include "aflatin.h"
     31 
     32 
     33 #ifdef AF_CONFIG_OPTION_CJK
     34 
     35 #undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT
     36 
     37 #include "afcjk.h"
     38 #include "aferrors.h"
     39 
     40 
     41 #ifdef AF_CONFIG_OPTION_USE_WARPER
     42 #include "afwarp.h"
     43 #endif
     44 
     45 
     46   /*************************************************************************/
     47   /*                                                                       */
     48   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
     49   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
     50   /* messages during execution.                                            */
     51   /*                                                                       */
     52 #undef  FT_COMPONENT
     53 #define FT_COMPONENT  trace_afcjk
     54 
     55 
     56   /*************************************************************************/
     57   /*************************************************************************/
     58   /*****                                                               *****/
     59   /*****              C J K   G L O B A L   M E T R I C S              *****/
     60   /*****                                                               *****/
     61   /*************************************************************************/
     62   /*************************************************************************/
     63 
     64 
     65   /* Basically the Latin version with AF_CJKMetrics */
     66   /* to replace AF_LatinMetrics.                    */
     67 
     68   FT_LOCAL_DEF( void )
     69   af_cjk_metrics_init_widths( AF_CJKMetrics  metrics,
     70                               FT_Face        face,
     71                               FT_ULong       charcode )
     72   {
     73     /* scan the array of segments in each direction */
     74     AF_GlyphHintsRec  hints[1];
     75 
     76 
     77     af_glyph_hints_init( hints, face->memory );
     78 
     79     metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
     80     metrics->axis[AF_DIMENSION_VERT].width_count = 0;
     81 
     82     {
     83       FT_Error          error;
     84       FT_UInt           glyph_index;
     85       int               dim;
     86       AF_CJKMetricsRec  dummy[1];
     87       AF_Scaler         scaler = &dummy->root.scaler;
     88 
     89 
     90       glyph_index = FT_Get_Char_Index( face, charcode );
     91       if ( glyph_index == 0 )
     92         goto Exit;
     93 
     94       error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
     95       if ( error || face->glyph->outline.n_points <= 0 )
     96         goto Exit;
     97 
     98       FT_ZERO( dummy );
     99 
    100       dummy->units_per_em = metrics->units_per_em;
    101 
    102       scaler->x_scale = 0x10000L;
    103       scaler->y_scale = 0x10000L;
    104       scaler->x_delta = 0;
    105       scaler->y_delta = 0;
    106 
    107       scaler->face        = face;
    108       scaler->render_mode = FT_RENDER_MODE_NORMAL;
    109       scaler->flags       = 0;
    110 
    111       af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy );
    112 
    113       error = af_glyph_hints_reload( hints, &face->glyph->outline );
    114       if ( error )
    115         goto Exit;
    116 
    117       for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
    118       {
    119         AF_CJKAxis    axis    = &metrics->axis[dim];
    120         AF_AxisHints  axhints = &hints->axis[dim];
    121         AF_Segment    seg, limit, link;
    122         FT_UInt       num_widths = 0;
    123 
    124 
    125         error = af_latin_hints_compute_segments( hints, (AF_Dimension)dim );
    126         if ( error )
    127           goto Exit;
    128 
    129         af_latin_hints_link_segments( hints, (AF_Dimension)dim );
    130 
    131         seg   = axhints->segments;
    132         limit = seg + axhints->num_segments;
    133 
    134         for ( ; seg < limit; seg++ )
    135         {
    136           link = seg->link;
    137 
    138           /* we only consider stem segments there! */
    139           if ( link && link->link == seg && link > seg )
    140           {
    141             FT_Pos  dist;
    142 
    143 
    144             dist = seg->pos - link->pos;
    145             if ( dist < 0 )
    146               dist = -dist;
    147 
    148             if ( num_widths < AF_CJK_MAX_WIDTHS )
    149               axis->widths[num_widths++].org = dist;
    150           }
    151         }
    152 
    153         af_sort_widths( num_widths, axis->widths );
    154         axis->width_count = num_widths;
    155       }
    156 
    157     Exit:
    158       for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
    159       {
    160         AF_CJKAxis  axis = &metrics->axis[dim];
    161         FT_Pos      stdw;
    162 
    163 
    164         stdw = ( axis->width_count > 0 ) ? axis->widths[0].org
    165                                          : AF_LATIN_CONSTANT( metrics, 50 );
    166 
    167         /* let's try 20% of the smallest width */
    168         axis->edge_distance_threshold = stdw / 5;
    169         axis->standard_width          = stdw;
    170         axis->extra_light             = 0;
    171       }
    172     }
    173 
    174     af_glyph_hints_done( hints );
    175   }
    176 
    177 
    178 #define AF_CJK_MAX_TEST_CHARACTERS  32
    179 
    180 
    181   /* Each blue zone has two types of fill and unfill, this is, */
    182   /* filling the entire glyph square or not.                   */
    183 
    184   enum
    185   {
    186     AF_CJK_BLUE_TYPE_FILL,
    187     AF_CJK_BLUE_TYPE_UNFILL,
    188     AF_CJK_BLUE_TYPE_MAX
    189   };
    190 
    191 
    192   /* Put some common and representative Han Ideographs characters here. */
    193   static const FT_ULong af_cjk_hani_blue_chars[AF_CJK_BLUE_MAX]
    194                                               [AF_CJK_BLUE_TYPE_MAX]
    195                                               [AF_CJK_MAX_TEST_CHARACTERS] =
    196   {
    197     {
    198       {
    199         0x4ED6, 0x4EEC, 0x4F60, 0x4F86, 0x5011, 0x5230, 0x548C, 0x5730,
    200         0x5BF9, 0x5C0D, 0x5C31, 0x5E2D, 0x6211, 0x65F6, 0x6642, 0x6703,
    201         0x6765, 0x70BA, 0x80FD, 0x8230, 0x8AAA, 0x8BF4, 0x8FD9, 0x9019,
    202         0x9F4A /* top fill */
    203       },
    204       {
    205         0x519B, 0x540C, 0x5DF2, 0x613F, 0x65E2, 0x661F, 0x662F, 0x666F,
    206         0x6C11, 0x7167, 0x73B0, 0x73FE, 0x7406, 0x7528, 0x7F6E, 0x8981,
    207         0x8ECD, 0x90A3, 0x914D, 0x91CC, 0x958B, 0x96F7, 0x9732, 0x9762,
    208         0x987E /* top unfill */
    209       }
    210     },
    211     {
    212       {
    213         0x4E2A, 0x4E3A, 0x4EBA, 0x4ED6, 0x4EE5, 0x4EEC, 0x4F60, 0x4F86,
    214         0x500B, 0x5011, 0x5230, 0x548C, 0x5927, 0x5BF9, 0x5C0D, 0x5C31,
    215         0x6211, 0x65F6, 0x6642, 0x6709, 0x6765, 0x70BA, 0x8981, 0x8AAA,
    216         0x8BF4 /* bottom fill */
    217       },
    218       {
    219         0x4E3B, 0x4E9B, 0x56E0, 0x5B83, 0x60F3, 0x610F, 0x7406, 0x751F,
    220         0x7576, 0x770B, 0x7740, 0x7F6E, 0x8005, 0x81EA, 0x8457, 0x88E1,
    221         0x8FC7, 0x8FD8, 0x8FDB, 0x9032, 0x904E, 0x9053, 0x9084, 0x91CC,
    222         0x9762 /* bottom unfill */
    223       }
    224     },
    225 #ifndef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT
    226       { {0x0000}, {0x0000} },
    227       { {0x0000}, {0x0000} }
    228 #else
    229     {
    230       {
    231         0x4E9B, 0x4EEC, 0x4F60, 0x4F86, 0x5011, 0x5230, 0x548C, 0x5730,
    232         0x5979, 0x5C06, 0x5C07, 0x5C31, 0x5E74, 0x5F97, 0x60C5, 0x6700,
    233         0x6837, 0x6A23, 0x7406, 0x80FD, 0x8AAA, 0x8BF4, 0x8FD9, 0x9019,
    234         0x901A /* left fill */
    235       },
    236       {
    237         0x5373, 0x5417, 0x5427, 0x542C, 0x5462, 0x54C1, 0x54CD, 0x55CE,
    238         0x5E08, 0x5E2B, 0x6536, 0x65AD, 0x65B7, 0x660E, 0x773C, 0x9593,
    239         0x95F4, 0x9645, 0x9648, 0x9650, 0x9664, 0x9673, 0x968F, 0x969B,
    240         0x96A8 /* left unfill */
    241       }
    242     },
    243     {
    244       {
    245         0x4E8B, 0x524D, 0x5B78, 0x5C06, 0x5C07, 0x60C5, 0x60F3, 0x6216,
    246         0x653F, 0x65AF, 0x65B0, 0x6837, 0x6A23, 0x6C11, 0x6C92, 0x6CA1,
    247         0x7136, 0x7279, 0x73B0, 0x73FE, 0x7403, 0x7B2C, 0x7D93, 0x8C01,
    248         0x8D77 /* right fill */
    249       },
    250       {
    251         0x4F8B, 0x5225, 0x522B, 0x5236, 0x52A8, 0x52D5, 0x5417, 0x55CE,
    252         0x589E, 0x6307, 0x660E, 0x671D, 0x671F, 0x6784, 0x7269, 0x786E,
    253         0x79CD, 0x8ABF, 0x8C03, 0x8CBB, 0x8D39, 0x90A3, 0x90FD, 0x9593,
    254         0x95F4 /* right unfill */
    255       }
    256     }
    257 #endif /* AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT */
    258   };
    259 
    260 
    261   /* Calculate blue zones for all the CJK_BLUE_XXX's. */
    262 
    263   static void
    264   af_cjk_metrics_init_blues( AF_CJKMetrics   metrics,
    265                              FT_Face         face,
    266                              const FT_ULong  blue_chars
    267                                                [AF_CJK_BLUE_MAX]
    268                                                [AF_CJK_BLUE_TYPE_MAX]
    269                                                [AF_CJK_MAX_TEST_CHARACTERS] )
    270   {
    271     FT_Pos        fills[AF_CJK_MAX_TEST_CHARACTERS];
    272     FT_Pos        flats[AF_CJK_MAX_TEST_CHARACTERS];
    273 
    274     FT_Int        num_fills;
    275     FT_Int        num_flats;
    276 
    277     FT_Int        bb;
    278     AF_CJKBlue    blue;
    279     FT_Error      error;
    280     AF_CJKAxis    axis;
    281     FT_GlyphSlot  glyph = face->glyph;
    282 
    283 #ifdef FT_DEBUG_LEVEL_TRACE
    284     FT_String*  cjk_blue_name[AF_CJK_BLUE_MAX] = {
    285       (FT_String*)"top",
    286       (FT_String*)"bottom",
    287       (FT_String*)"left",
    288       (FT_String*)"right"
    289     };
    290     FT_String*  cjk_blue_type_name[AF_CJK_BLUE_TYPE_MAX] = {
    291       (FT_String*)"filled",
    292       (FT_String*)"unfilled"
    293     };
    294 #endif
    295 
    296 
    297     /* We compute the blues simply by loading each character from the */
    298     /* `blue_chars[blues]' string, then computing its extreme points  */
    299     /* (depending blue zone type etc.).                               */
    300 
    301     FT_TRACE5(( "cjk blue zones computation\n" ));
    302     FT_TRACE5(( "------------------------------------------------\n" ));
    303 
    304     for ( bb = 0; bb < AF_CJK_BLUE_MAX; bb++ )
    305     {
    306       FT_Int   fill_type;
    307       FT_Pos*  blue_ref;
    308       FT_Pos*  blue_shoot;
    309 
    310 
    311       num_fills = 0;
    312       num_flats = 0;
    313 
    314       for ( fill_type = 0; fill_type < AF_CJK_BLUE_TYPE_MAX; fill_type++ )
    315       {
    316         const FT_ULong*  p     = blue_chars[bb][fill_type];
    317         const FT_ULong*  limit = p + AF_CJK_MAX_TEST_CHARACTERS;
    318         FT_Bool          fill  = FT_BOOL(
    319                                    fill_type == AF_CJK_BLUE_TYPE_FILL );
    320 
    321 
    322         FT_TRACE5(( "cjk blue %s/%s\n", cjk_blue_name[bb],
    323                                         cjk_blue_type_name[fill_type] ));
    324 
    325 
    326         for ( ; p < limit && *p; p++ )
    327         {
    328           FT_UInt     glyph_index;
    329           FT_Pos      best_pos; /* same as points.y */
    330           FT_Int      best_point;
    331           FT_Vector*  points;
    332 
    333 
    334           FT_TRACE5(( "  U+%lX...", *p ));
    335 
    336           /* load the character in the face -- skip unknown or empty ones */
    337           glyph_index = FT_Get_Char_Index( face, *p );
    338           if ( glyph_index == 0 )
    339           {
    340             FT_TRACE5(( "unavailable\n" ));
    341             continue;
    342           }
    343 
    344           error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
    345           if ( error || glyph->outline.n_points <= 0 )
    346           {
    347             FT_TRACE5(( "no outline\n" ));
    348             continue;
    349           }
    350 
    351           /* now compute min or max point indices and coordinates */
    352           points     = glyph->outline.points;
    353           best_point = -1;
    354           best_pos   = 0;  /* make compiler happy */
    355 
    356           {
    357             FT_Int  nn;
    358             FT_Int  first = 0;
    359             FT_Int  last  = -1;
    360 
    361 
    362             for ( nn = 0;
    363                   nn < glyph->outline.n_contours;
    364                   first = last + 1, nn++ )
    365             {
    366               FT_Int  pp;
    367 
    368 
    369               last = glyph->outline.contours[nn];
    370 
    371               /* Avoid single-point contours since they are never       */
    372               /* rasterized.  In some fonts, they correspond to mark    */
    373               /* attachment points which are way outside of the glyph's */
    374               /* real outline.                                          */
    375               if ( last <= first )
    376                 continue;
    377 
    378               switch ( bb )
    379               {
    380               case AF_CJK_BLUE_TOP:
    381                 for ( pp = first; pp <= last; pp++ )
    382                   if ( best_point < 0 || points[pp].y > best_pos )
    383                   {
    384                     best_point = pp;
    385                     best_pos   = points[pp].y;
    386                   }
    387                 break;
    388 
    389               case AF_CJK_BLUE_BOTTOM:
    390                 for ( pp = first; pp <= last; pp++ )
    391                   if ( best_point < 0 || points[pp].y < best_pos )
    392                   {
    393                     best_point = pp;
    394                     best_pos   = points[pp].y;
    395                   }
    396                 break;
    397 
    398               case AF_CJK_BLUE_LEFT:
    399                 for ( pp = first; pp <= last; pp++ )
    400                   if ( best_point < 0 || points[pp].x < best_pos )
    401                   {
    402                     best_point = pp;
    403                     best_pos   = points[pp].x;
    404                   }
    405                 break;
    406 
    407               case AF_CJK_BLUE_RIGHT:
    408                 for ( pp = first; pp <= last; pp++ )
    409                   if ( best_point < 0 || points[pp].x > best_pos )
    410                   {
    411                     best_point = pp;
    412                     best_pos   = points[pp].x;
    413                   }
    414                 break;
    415 
    416               default:
    417                 ;
    418               }
    419             }
    420             FT_TRACE5(( "best_pos=%5ld\n", best_pos ));
    421           }
    422 
    423           if ( fill )
    424             fills[num_fills++] = best_pos;
    425           else
    426             flats[num_flats++] = best_pos;
    427         }
    428       }
    429 
    430       if ( num_flats == 0 && num_fills == 0 )
    431       {
    432         /*
    433          *  we couldn't find a single glyph to compute this blue zone,
    434          *  we will simply ignore it then
    435          */
    436         FT_TRACE5(( "empty\n" ));
    437         continue;
    438       }
    439 
    440       /* we have computed the contents of the `fill' and `flats' tables, */
    441       /* now determine the reference position of the blue --             */
    442       /* we simply take the median value after a simple sort             */
    443       af_sort_pos( num_flats, flats );
    444       af_sort_pos( num_fills, fills );
    445 
    446       if ( AF_CJK_BLUE_TOP == bb || AF_CJK_BLUE_BOTTOM == bb )
    447         axis = &metrics->axis[AF_DIMENSION_VERT];
    448       else
    449         axis = &metrics->axis[AF_DIMENSION_HORZ];
    450 
    451       blue       = & axis->blues[axis->blue_count];
    452       blue_ref   = & blue->ref.org;
    453       blue_shoot = & blue->shoot.org;
    454 
    455       axis->blue_count++;
    456       if ( num_flats == 0 )
    457       {
    458         *blue_ref   = fills[num_fills / 2];
    459         *blue_shoot = fills[num_fills / 2];
    460       }
    461       else if ( num_fills == 0 )
    462       {
    463         *blue_ref   = flats[num_flats / 2];
    464         *blue_shoot = flats[num_flats / 2];
    465       }
    466       else
    467       {
    468         *blue_ref   = fills[num_fills / 2];
    469         *blue_shoot = flats[num_flats / 2];
    470       }
    471 
    472       /* make sure blue_ref >= blue_shoot for top/right or */
    473       /* vice versa for bottom/left                        */
    474       if ( *blue_shoot != *blue_ref )
    475       {
    476         FT_Pos   ref       = *blue_ref;
    477         FT_Pos   shoot     = *blue_shoot;
    478         FT_Bool  under_ref = FT_BOOL( shoot < ref );
    479 
    480 
    481         if ( (AF_CJK_BLUE_TOP == bb || AF_CJK_BLUE_RIGHT == bb) ^ under_ref )
    482           *blue_shoot = *blue_ref = ( shoot + ref ) / 2;
    483       }
    484 
    485       blue->flags = 0;
    486       if ( AF_CJK_BLUE_TOP == bb )
    487         blue->flags |= AF_CJK_BLUE_IS_TOP;
    488       else if ( AF_CJK_BLUE_RIGHT == bb )
    489         blue->flags |= AF_CJK_BLUE_IS_RIGHT;
    490 
    491       FT_TRACE5(( "-- cjk %s bluezone ref = %ld shoot = %ld\n",
    492                   cjk_blue_name[bb], *blue_ref, *blue_shoot ));
    493     }
    494 
    495     return;
    496   }
    497 
    498 
    499   /* Basically the Latin version with type AF_CJKMetrics for metrics. */
    500   FT_LOCAL_DEF( void )
    501   af_cjk_metrics_check_digits( AF_CJKMetrics  metrics,
    502                                FT_Face        face )
    503   {
    504     FT_UInt   i;
    505     FT_Bool   started = 0, same_width = 1;
    506     FT_Fixed  advance, old_advance = 0;
    507 
    508 
    509     /* check whether all ASCII digits have the same advance width; */
    510     /* digit `0' is 0x30 in all supported charmaps                 */
    511     for ( i = 0x30; i <= 0x39; i++ )
    512     {
    513       FT_UInt  glyph_index;
    514 
    515 
    516       glyph_index = FT_Get_Char_Index( face, i );
    517       if ( glyph_index == 0 )
    518         continue;
    519 
    520       if ( FT_Get_Advance( face, glyph_index,
    521                            FT_LOAD_NO_SCALE         |
    522                            FT_LOAD_NO_HINTING       |
    523                            FT_LOAD_IGNORE_TRANSFORM,
    524                            &advance ) )
    525         continue;
    526 
    527       if ( started )
    528       {
    529         if ( advance != old_advance )
    530         {
    531           same_width = 0;
    532           break;
    533         }
    534       }
    535       else
    536       {
    537         old_advance = advance;
    538         started     = 1;
    539       }
    540     }
    541 
    542     metrics->root.digits_have_same_width = same_width;
    543   }
    544 
    545 
    546   FT_LOCAL_DEF( FT_Error )
    547   af_cjk_metrics_init( AF_CJKMetrics  metrics,
    548                        FT_Face        face )
    549   {
    550     FT_CharMap  oldmap = face->charmap;
    551 
    552 
    553     metrics->units_per_em = face->units_per_EM;
    554 
    555     if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
    556       face->charmap = NULL;
    557     else
    558     {
    559       af_cjk_metrics_init_widths( metrics, face, 0x7530 );
    560       af_cjk_metrics_init_blues( metrics, face, af_cjk_hani_blue_chars );
    561       af_cjk_metrics_check_digits( metrics, face );
    562     }
    563 
    564     FT_Set_Charmap( face, oldmap );
    565 
    566     return AF_Err_Ok;
    567   }
    568 
    569 
    570   static void
    571   af_cjk_metrics_scale_dim( AF_CJKMetrics  metrics,
    572                             AF_Scaler      scaler,
    573                             AF_Dimension   dim )
    574   {
    575     FT_Fixed    scale;
    576     FT_Pos      delta;
    577     AF_CJKAxis  axis;
    578     FT_UInt     nn;
    579 
    580 
    581     axis = &metrics->axis[dim];
    582 
    583     if ( dim == AF_DIMENSION_HORZ )
    584     {
    585       scale = scaler->x_scale;
    586       delta = scaler->x_delta;
    587     }
    588     else
    589     {
    590       scale = scaler->y_scale;
    591       delta = scaler->y_delta;
    592     }
    593 
    594     if ( axis->org_scale == scale && axis->org_delta == delta )
    595       return;
    596 
    597     axis->org_scale = scale;
    598     axis->org_delta = delta;
    599 
    600     axis->scale = scale;
    601     axis->delta = delta;
    602 
    603     /* scale the blue zones */
    604     for ( nn = 0; nn < axis->blue_count; nn++ )
    605     {
    606       AF_CJKBlue  blue = &axis->blues[nn];
    607       FT_Pos      dist;
    608 
    609 
    610       blue->ref.cur   = FT_MulFix( blue->ref.org, scale ) + delta;
    611       blue->ref.fit   = blue->ref.cur;
    612       blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
    613       blue->shoot.fit = blue->shoot.cur;
    614       blue->flags    &= ~AF_CJK_BLUE_ACTIVE;
    615 
    616       /* a blue zone is only active if it is less than 3/4 pixels tall */
    617       dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
    618       if ( dist <= 48 && dist >= -48 )
    619       {
    620         FT_Pos  delta1, delta2;
    621 
    622 
    623         blue->ref.fit  = FT_PIX_ROUND( blue->ref.cur );
    624 
    625         /* shoot is under shoot for cjk */
    626         delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org;
    627         delta2 = delta1;
    628         if ( delta1 < 0 )
    629           delta2 = -delta2;
    630 
    631         delta2 = FT_MulFix( delta2, scale );
    632 
    633         FT_TRACE5(( "delta: %d", delta1 ));
    634         if ( delta2 < 32 )
    635           delta2 = 0;
    636 #if 0
    637         else if ( delta2 < 64 )
    638           delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
    639 #endif
    640         else
    641           delta2 = FT_PIX_ROUND( delta2 );
    642         FT_TRACE5(( "/%d\n", delta2 ));
    643 
    644         if ( delta1 < 0 )
    645           delta2 = -delta2;
    646 
    647         blue->shoot.fit = blue->ref.fit - delta2;
    648 
    649         FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]: "
    650                      "ref: cur=%.2f fit=%.2f shoot: cur=%.2f fit=%.2f\n",
    651                        ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V',
    652                        nn, blue->ref.org, blue->shoot.org,
    653                        blue->ref.cur / 64.0, blue->ref.fit / 64.0,
    654                        blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 ));
    655 
    656         blue->flags |= AF_CJK_BLUE_ACTIVE;
    657       }
    658     }
    659   }
    660 
    661 
    662   FT_LOCAL_DEF( void )
    663   af_cjk_metrics_scale( AF_CJKMetrics  metrics,
    664                         AF_Scaler      scaler )
    665   {
    666     metrics->root.scaler = *scaler;
    667 
    668     af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
    669     af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
    670   }
    671 
    672 
    673   /*************************************************************************/
    674   /*************************************************************************/
    675   /*****                                                               *****/
    676   /*****              C J K   G L Y P H   A N A L Y S I S              *****/
    677   /*****                                                               *****/
    678   /*************************************************************************/
    679   /*************************************************************************/
    680 
    681   static FT_Error
    682   af_cjk_hints_compute_segments( AF_GlyphHints  hints,
    683                                  AF_Dimension   dim )
    684   {
    685     AF_AxisHints  axis          = &hints->axis[dim];
    686     AF_Segment    segments      = axis->segments;
    687     AF_Segment    segment_limit = segments + axis->num_segments;
    688     FT_Error      error;
    689     AF_Segment    seg;
    690 
    691 
    692     error = af_latin_hints_compute_segments( hints, dim );
    693     if ( error )
    694       return error;
    695 
    696     /* a segment is round if it doesn't have successive */
    697     /* on-curve points.                                 */
    698     for ( seg = segments; seg < segment_limit; seg++ )
    699     {
    700       AF_Point  pt   = seg->first;
    701       AF_Point  last = seg->last;
    702       AF_Flags  f0   = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
    703       AF_Flags  f1;
    704 
    705 
    706       seg->flags &= ~AF_EDGE_ROUND;
    707 
    708       for ( ; pt != last; f0 = f1 )
    709       {
    710         pt = pt->next;
    711         f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
    712 
    713         if ( !f0 && !f1 )
    714           break;
    715 
    716         if ( pt == last )
    717           seg->flags |= AF_EDGE_ROUND;
    718       }
    719     }
    720 
    721     return AF_Err_Ok;
    722   }
    723 
    724 
    725   static void
    726   af_cjk_hints_link_segments( AF_GlyphHints  hints,
    727                               AF_Dimension   dim )
    728   {
    729     AF_AxisHints  axis          = &hints->axis[dim];
    730     AF_Segment    segments      = axis->segments;
    731     AF_Segment    segment_limit = segments + axis->num_segments;
    732     AF_Direction  major_dir     = axis->major_dir;
    733     AF_Segment    seg1, seg2;
    734     FT_Pos        len_threshold;
    735     FT_Pos        dist_threshold;
    736 
    737 
    738     len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
    739 
    740     dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
    741                                                   : hints->y_scale;
    742     dist_threshold = FT_DivFix( 64 * 3, dist_threshold );
    743 
    744     /* now compare each segment to the others */
    745     for ( seg1 = segments; seg1 < segment_limit; seg1++ )
    746     {
    747       /* the fake segments are for metrics hinting only */
    748       if ( seg1->first == seg1->last )
    749         continue;
    750 
    751       if ( seg1->dir != major_dir )
    752         continue;
    753 
    754       for ( seg2 = segments; seg2 < segment_limit; seg2++ )
    755         if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
    756         {
    757           FT_Pos  dist = seg2->pos - seg1->pos;
    758 
    759 
    760           if ( dist < 0 )
    761             continue;
    762 
    763           {
    764             FT_Pos  min = seg1->min_coord;
    765             FT_Pos  max = seg1->max_coord;
    766             FT_Pos  len;
    767 
    768 
    769             if ( min < seg2->min_coord )
    770               min = seg2->min_coord;
    771 
    772             if ( max > seg2->max_coord )
    773               max = seg2->max_coord;
    774 
    775             len = max - min;
    776             if ( len >= len_threshold )
    777             {
    778               if ( dist * 8 < seg1->score * 9                        &&
    779                    ( dist * 8 < seg1->score * 7 || seg1->len < len ) )
    780               {
    781                 seg1->score = dist;
    782                 seg1->len   = len;
    783                 seg1->link  = seg2;
    784               }
    785 
    786               if ( dist * 8 < seg2->score * 9                        &&
    787                    ( dist * 8 < seg2->score * 7 || seg2->len < len ) )
    788               {
    789                 seg2->score = dist;
    790                 seg2->len   = len;
    791                 seg2->link  = seg1;
    792               }
    793             }
    794           }
    795         }
    796     }
    797 
    798     /*
    799      *  now compute the `serif' segments
    800      *
    801      *  In Hanzi, some strokes are wider on one or both of the ends.
    802      *  We either identify the stems on the ends as serifs or remove
    803      *  the linkage, depending on the length of the stems.
    804      *
    805      */
    806 
    807     {
    808       AF_Segment  link1, link2;
    809 
    810 
    811       for ( seg1 = segments; seg1 < segment_limit; seg1++ )
    812       {
    813         link1 = seg1->link;
    814         if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )
    815           continue;
    816 
    817         if ( seg1->score >= dist_threshold )
    818           continue;
    819 
    820         for ( seg2 = segments; seg2 < segment_limit; seg2++ )
    821         {
    822           if ( seg2->pos > seg1->pos || seg1 == seg2 )
    823             continue;
    824 
    825           link2 = seg2->link;
    826           if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )
    827             continue;
    828 
    829           if ( seg1->pos == seg2->pos && link1->pos == link2->pos )
    830             continue;
    831 
    832           if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )
    833             continue;
    834 
    835           /* seg2 < seg1 < link1 < link2 */
    836 
    837           if ( seg1->len >= seg2->len * 3 )
    838           {
    839             AF_Segment  seg;
    840 
    841 
    842             for ( seg = segments; seg < segment_limit; seg++ )
    843             {
    844               AF_Segment  link = seg->link;
    845 
    846 
    847               if ( link == seg2 )
    848               {
    849                 seg->link  = 0;
    850                 seg->serif = link1;
    851               }
    852               else if ( link == link2 )
    853               {
    854                 seg->link  = 0;
    855                 seg->serif = seg1;
    856               }
    857             }
    858           }
    859           else
    860           {
    861             seg1->link = link1->link = 0;
    862 
    863             break;
    864           }
    865         }
    866       }
    867     }
    868 
    869     for ( seg1 = segments; seg1 < segment_limit; seg1++ )
    870     {
    871       seg2 = seg1->link;
    872 
    873       if ( seg2 )
    874       {
    875         seg2->num_linked++;
    876         if ( seg2->link != seg1 )
    877         {
    878           seg1->link = 0;
    879 
    880           if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
    881             seg1->serif = seg2->link;
    882           else
    883             seg2->num_linked--;
    884         }
    885       }
    886     }
    887   }
    888 
    889 
    890   static FT_Error
    891   af_cjk_hints_compute_edges( AF_GlyphHints  hints,
    892                               AF_Dimension   dim )
    893   {
    894     AF_AxisHints  axis   = &hints->axis[dim];
    895     FT_Error      error  = AF_Err_Ok;
    896     FT_Memory     memory = hints->memory;
    897     AF_CJKAxis    laxis  = &((AF_CJKMetrics)hints->metrics)->axis[dim];
    898 
    899     AF_Segment    segments      = axis->segments;
    900     AF_Segment    segment_limit = segments + axis->num_segments;
    901     AF_Segment    seg;
    902 
    903     FT_Fixed      scale;
    904     FT_Pos        edge_distance_threshold;
    905 
    906 
    907     axis->num_edges = 0;
    908 
    909     scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
    910                                          : hints->y_scale;
    911 
    912     /*********************************************************************/
    913     /*                                                                   */
    914     /* We begin by generating a sorted table of edges for the current    */
    915     /* direction.  To do so, we simply scan each segment and try to find */
    916     /* an edge in our table that corresponds to its position.            */
    917     /*                                                                   */
    918     /* If no edge is found, we create and insert a new edge in the       */
    919     /* sorted table.  Otherwise, we simply add the segment to the edge's */
    920     /* list which is then processed in the second step to compute the    */
    921     /* edge's properties.                                                */
    922     /*                                                                   */
    923     /* Note that the edges table is sorted along the segment/edge        */
    924     /* position.                                                         */
    925     /*                                                                   */
    926     /*********************************************************************/
    927 
    928     edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
    929                                          scale );
    930     if ( edge_distance_threshold > 64 / 4 )
    931       edge_distance_threshold = FT_DivFix( 64 / 4, scale );
    932     else
    933       edge_distance_threshold = laxis->edge_distance_threshold;
    934 
    935     for ( seg = segments; seg < segment_limit; seg++ )
    936     {
    937       AF_Edge  found = 0;
    938       FT_Pos   best  = 0xFFFFU;
    939       FT_Int   ee;
    940 
    941 
    942       /* look for an edge corresponding to the segment */
    943       for ( ee = 0; ee < axis->num_edges; ee++ )
    944       {
    945         AF_Edge  edge = axis->edges + ee;
    946         FT_Pos   dist;
    947 
    948 
    949         if ( edge->dir != seg->dir )
    950           continue;
    951 
    952         dist = seg->pos - edge->fpos;
    953         if ( dist < 0 )
    954           dist = -dist;
    955 
    956         if ( dist < edge_distance_threshold && dist < best )
    957         {
    958           AF_Segment  link = seg->link;
    959 
    960 
    961           /* check whether all linked segments of the candidate edge */
    962           /* can make a single edge.                                 */
    963           if ( link )
    964           {
    965             AF_Segment  seg1 = edge->first;
    966             AF_Segment  link1;
    967             FT_Pos      dist2 = 0;
    968 
    969 
    970             do
    971             {
    972               link1 = seg1->link;
    973               if ( link1 )
    974               {
    975                 dist2 = AF_SEGMENT_DIST( link, link1 );
    976                 if ( dist2 >= edge_distance_threshold )
    977                   break;
    978               }
    979 
    980             } while ( ( seg1 = seg1->edge_next ) != edge->first );
    981 
    982             if ( dist2 >= edge_distance_threshold )
    983               continue;
    984           }
    985 
    986           best  = dist;
    987           found = edge;
    988         }
    989       }
    990 
    991       if ( !found )
    992       {
    993         AF_Edge  edge;
    994 
    995 
    996         /* insert a new edge in the list and */
    997         /* sort according to the position    */
    998         error = af_axis_hints_new_edge( axis, seg->pos,
    999                                         (AF_Direction)seg->dir,
   1000                                         memory, &edge );
   1001         if ( error )
   1002           goto Exit;
   1003 
   1004         /* add the segment to the new edge's list */
   1005         FT_ZERO( edge );
   1006 
   1007         edge->first    = seg;
   1008         edge->last     = seg;
   1009         edge->fpos     = seg->pos;
   1010         edge->opos     = edge->pos = FT_MulFix( seg->pos, scale );
   1011         seg->edge_next = seg;
   1012         edge->dir      = seg->dir;
   1013       }
   1014       else
   1015       {
   1016         /* if an edge was found, simply add the segment to the edge's */
   1017         /* list                                                       */
   1018         seg->edge_next         = found->first;
   1019         found->last->edge_next = seg;
   1020         found->last            = seg;
   1021       }
   1022     }
   1023 
   1024     /*********************************************************************/
   1025     /*                                                                   */
   1026     /* Good, we now compute each edge's properties according to segments */
   1027     /* found on its position.  Basically, these are as follows.          */
   1028     /*                                                                   */
   1029     /*  - edge's main direction                                          */
   1030     /*  - stem edge, serif edge or both (which defaults to stem then)    */
   1031     /*  - rounded edge, straight or both (which defaults to straight)    */
   1032     /*  - link for edge                                                  */
   1033     /*                                                                   */
   1034     /*********************************************************************/
   1035 
   1036     /* first of all, set the `edge' field in each segment -- this is     */
   1037     /* required in order to compute edge links                           */
   1038     /*                                                                   */
   1039     /* Note that removing this loop and setting the `edge' field of each */
   1040     /* segment directly in the code above slows down execution speed for */
   1041     /* some reasons on platforms like the Sun.                           */
   1042 
   1043     {
   1044       AF_Edge  edges      = axis->edges;
   1045       AF_Edge  edge_limit = edges + axis->num_edges;
   1046       AF_Edge  edge;
   1047 
   1048 
   1049       for ( edge = edges; edge < edge_limit; edge++ )
   1050       {
   1051         seg = edge->first;
   1052         if ( seg )
   1053           do
   1054           {
   1055             seg->edge = edge;
   1056             seg       = seg->edge_next;
   1057 
   1058           } while ( seg != edge->first );
   1059       }
   1060 
   1061       /* now compute each edge properties */
   1062       for ( edge = edges; edge < edge_limit; edge++ )
   1063       {
   1064         FT_Int  is_round    = 0;  /* does it contain round segments?    */
   1065         FT_Int  is_straight = 0;  /* does it contain straight segments? */
   1066 
   1067 
   1068         seg = edge->first;
   1069 
   1070         do
   1071         {
   1072           FT_Bool  is_serif;
   1073 
   1074 
   1075           /* check for roundness of segment */
   1076           if ( seg->flags & AF_EDGE_ROUND )
   1077             is_round++;
   1078           else
   1079             is_straight++;
   1080 
   1081           /* check for links -- if seg->serif is set, then seg->link must */
   1082           /* be ignored                                                   */
   1083           is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge );
   1084 
   1085           if ( seg->link || is_serif )
   1086           {
   1087             AF_Edge     edge2;
   1088             AF_Segment  seg2;
   1089 
   1090 
   1091             edge2 = edge->link;
   1092             seg2  = seg->link;
   1093 
   1094             if ( is_serif )
   1095             {
   1096               seg2  = seg->serif;
   1097               edge2 = edge->serif;
   1098             }
   1099 
   1100             if ( edge2 )
   1101             {
   1102               FT_Pos  edge_delta;
   1103               FT_Pos  seg_delta;
   1104 
   1105 
   1106               edge_delta = edge->fpos - edge2->fpos;
   1107               if ( edge_delta < 0 )
   1108                 edge_delta = -edge_delta;
   1109 
   1110               seg_delta = AF_SEGMENT_DIST( seg, seg2 );
   1111 
   1112               if ( seg_delta < edge_delta )
   1113                 edge2 = seg2->edge;
   1114             }
   1115             else
   1116               edge2 = seg2->edge;
   1117 
   1118             if ( is_serif )
   1119             {
   1120               edge->serif   = edge2;
   1121               edge2->flags |= AF_EDGE_SERIF;
   1122             }
   1123             else
   1124               edge->link  = edge2;
   1125           }
   1126 
   1127           seg = seg->edge_next;
   1128 
   1129         } while ( seg != edge->first );
   1130 
   1131         /* set the round/straight flags */
   1132         edge->flags = AF_EDGE_NORMAL;
   1133 
   1134         if ( is_round > 0 && is_round >= is_straight )
   1135           edge->flags |= AF_EDGE_ROUND;
   1136 
   1137         /* get rid of serifs if link is set                 */
   1138         /* XXX: This gets rid of many unpleasant artefacts! */
   1139         /*      Example: the `c' in cour.pfa at size 13     */
   1140 
   1141         if ( edge->serif && edge->link )
   1142           edge->serif = 0;
   1143       }
   1144     }
   1145 
   1146   Exit:
   1147     return error;
   1148   }
   1149 
   1150 
   1151   static FT_Error
   1152   af_cjk_hints_detect_features( AF_GlyphHints  hints,
   1153                                 AF_Dimension   dim )
   1154   {
   1155     FT_Error  error;
   1156 
   1157 
   1158     error = af_cjk_hints_compute_segments( hints, dim );
   1159     if ( !error )
   1160     {
   1161       af_cjk_hints_link_segments( hints, dim );
   1162 
   1163       error = af_cjk_hints_compute_edges( hints, dim );
   1164     }
   1165     return error;
   1166   }
   1167 
   1168 
   1169   FT_LOCAL_DEF( void )
   1170   af_cjk_hints_compute_blue_edges( AF_GlyphHints  hints,
   1171                                    AF_CJKMetrics  metrics,
   1172                                    AF_Dimension   dim )
   1173   {
   1174     AF_AxisHints  axis       = &hints->axis[dim];
   1175     AF_Edge       edge       = axis->edges;
   1176     AF_Edge       edge_limit = edge + axis->num_edges;
   1177     AF_CJKAxis    cjk        = &metrics->axis[dim];
   1178     FT_Fixed      scale      = cjk->scale;
   1179     FT_Pos        best_dist0;  /* initial threshold */
   1180 
   1181 
   1182     /* compute the initial threshold as a fraction of the EM size */
   1183     best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
   1184 
   1185     if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */
   1186       best_dist0 = 64 / 2;
   1187 
   1188     /* compute which blue zones are active, i.e. have their scaled */
   1189     /* size < 3/4 pixels                                           */
   1190 
   1191     /* If the distant between an edge and a blue zone is shorter than */
   1192     /* best_dist0, set the blue zone for the edge.  Then search for   */
   1193     /* the blue zone with the smallest best_dist to the edge.         */
   1194 
   1195     for ( ; edge < edge_limit; edge++ )
   1196     {
   1197       FT_UInt   bb;
   1198       AF_Width  best_blue = NULL;
   1199       FT_Pos    best_dist = best_dist0;
   1200 
   1201 
   1202       for ( bb = 0; bb < cjk->blue_count; bb++ )
   1203       {
   1204         AF_CJKBlue  blue = cjk->blues + bb;
   1205         FT_Bool     is_top_right_blue, is_major_dir;
   1206 
   1207 
   1208         /* skip inactive blue zones (i.e., those that are too small) */
   1209         if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) )
   1210           continue;
   1211 
   1212         /* if it is a top zone, check for right edges -- if it is a bottom */
   1213         /* zone, check for left edges                                      */
   1214         /*                                                                 */
   1215         /* of course, that's for TrueType                                  */
   1216         is_top_right_blue  =
   1217           FT_BOOL( ( ( blue->flags & AF_CJK_BLUE_IS_TOP )   != 0 ) ||
   1218                    ( ( blue->flags & AF_CJK_BLUE_IS_RIGHT ) != 0 ) );
   1219         is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
   1220 
   1221         /* if it is a top zone, the edge must be against the major    */
   1222         /* direction; if it is a bottom zone, it must be in the major */
   1223         /* direction                                                  */
   1224         if ( is_top_right_blue ^ is_major_dir )
   1225         {
   1226           FT_Pos    dist;
   1227           AF_Width  compare;
   1228 
   1229 
   1230           /* Compare the edge to the closest blue zone type */
   1231           if ( FT_ABS( edge->fpos - blue->ref.org ) >
   1232                FT_ABS( edge->fpos - blue->shoot.org ) )
   1233             compare = &blue->shoot;
   1234           else
   1235             compare = &blue->ref;
   1236 
   1237           dist = edge->fpos - compare->org;
   1238           if ( dist < 0 )
   1239             dist = -dist;
   1240 
   1241           dist = FT_MulFix( dist, scale );
   1242           if ( dist < best_dist )
   1243           {
   1244             best_dist = dist;
   1245             best_blue = compare;
   1246           }
   1247         }
   1248       }
   1249 
   1250       if ( best_blue )
   1251         edge->blue_edge = best_blue;
   1252     }
   1253   }
   1254 
   1255 
   1256   FT_LOCAL_DEF( FT_Error )
   1257   af_cjk_hints_init( AF_GlyphHints  hints,
   1258                      AF_CJKMetrics  metrics )
   1259   {
   1260     FT_Render_Mode  mode;
   1261     FT_UInt32       scaler_flags, other_flags;
   1262 
   1263 
   1264     af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
   1265 
   1266     /*
   1267      *  correct x_scale and y_scale when needed, since they may have
   1268      *  been modified af_cjk_scale_dim above
   1269      */
   1270     hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
   1271     hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
   1272     hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
   1273     hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
   1274 
   1275     /* compute flags depending on render mode, etc. */
   1276     mode = metrics->root.scaler.render_mode;
   1277 
   1278 #ifdef AF_CONFIG_OPTION_USE_WARPER
   1279     if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
   1280       metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
   1281 #endif
   1282 
   1283     scaler_flags = hints->scaler_flags;
   1284     other_flags  = 0;
   1285 
   1286     /*
   1287      *  We snap the width of vertical stems for the monochrome and
   1288      *  horizontal LCD rendering targets only.
   1289      */
   1290     if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
   1291       other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
   1292 
   1293     /*
   1294      *  We snap the width of horizontal stems for the monochrome and
   1295      *  vertical LCD rendering targets only.
   1296      */
   1297     if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
   1298       other_flags |= AF_LATIN_HINTS_VERT_SNAP;
   1299 
   1300     /*
   1301      *  We adjust stems to full pixels only if we don't use the `light' mode.
   1302      */
   1303     if ( mode != FT_RENDER_MODE_LIGHT )
   1304       other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
   1305 
   1306     if ( mode == FT_RENDER_MODE_MONO )
   1307       other_flags |= AF_LATIN_HINTS_MONO;
   1308 
   1309     scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
   1310 
   1311     hints->scaler_flags = scaler_flags;
   1312     hints->other_flags  = other_flags;
   1313 
   1314     return 0;
   1315   }
   1316 
   1317 
   1318   /*************************************************************************/
   1319   /*************************************************************************/
   1320   /*****                                                               *****/
   1321   /*****          C J K   G L Y P H   G R I D - F I T T I N G          *****/
   1322   /*****                                                               *****/
   1323   /*************************************************************************/
   1324   /*************************************************************************/
   1325 
   1326   /* snap a given width in scaled coordinates to one of the */
   1327   /* current standard widths                                */
   1328 
   1329   static FT_Pos
   1330   af_cjk_snap_width( AF_Width  widths,
   1331                      FT_Int    count,
   1332                      FT_Pos    width )
   1333   {
   1334     int     n;
   1335     FT_Pos  best      = 64 + 32 + 2;
   1336     FT_Pos  reference = width;
   1337     FT_Pos  scaled;
   1338 
   1339 
   1340     for ( n = 0; n < count; n++ )
   1341     {
   1342       FT_Pos  w;
   1343       FT_Pos  dist;
   1344 
   1345 
   1346       w = widths[n].cur;
   1347       dist = width - w;
   1348       if ( dist < 0 )
   1349         dist = -dist;
   1350       if ( dist < best )
   1351       {
   1352         best      = dist;
   1353         reference = w;
   1354       }
   1355     }
   1356 
   1357     scaled = FT_PIX_ROUND( reference );
   1358 
   1359     if ( width >= reference )
   1360     {
   1361       if ( width < scaled + 48 )
   1362         width = reference;
   1363     }
   1364     else
   1365     {
   1366       if ( width > scaled - 48 )
   1367         width = reference;
   1368     }
   1369 
   1370     return width;
   1371   }
   1372 
   1373 
   1374   /* compute the snapped width of a given stem */
   1375 
   1376   static FT_Pos
   1377   af_cjk_compute_stem_width( AF_GlyphHints  hints,
   1378                              AF_Dimension   dim,
   1379                              FT_Pos         width,
   1380                              AF_Edge_Flags  base_flags,
   1381                              AF_Edge_Flags  stem_flags )
   1382   {
   1383     AF_CJKMetrics  metrics  = (AF_CJKMetrics) hints->metrics;
   1384     AF_CJKAxis     axis     = & metrics->axis[dim];
   1385     FT_Pos         dist     = width;
   1386     FT_Int         sign     = 0;
   1387     FT_Bool        vertical = FT_BOOL( dim == AF_DIMENSION_VERT );
   1388 
   1389     FT_UNUSED( base_flags );
   1390     FT_UNUSED( stem_flags );
   1391 
   1392 
   1393     if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
   1394       return width;
   1395 
   1396     if ( dist < 0 )
   1397     {
   1398       dist = -width;
   1399       sign = 1;
   1400     }
   1401 
   1402     if ( (  vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
   1403          ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
   1404     {
   1405       /* smooth hinting process: very lightly quantize the stem width */
   1406 
   1407       if ( axis->width_count > 0 )
   1408       {
   1409         if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )
   1410         {
   1411           dist = axis->widths[0].cur;
   1412           if ( dist < 48 )
   1413             dist = 48;
   1414 
   1415           goto Done_Width;
   1416         }
   1417       }
   1418 
   1419       if ( dist < 54 )
   1420         dist += ( 54 - dist ) / 2 ;
   1421       else if ( dist < 3 * 64 )
   1422       {
   1423         FT_Pos  delta;
   1424 
   1425 
   1426         delta  = dist & 63;
   1427         dist  &= -64;
   1428 
   1429         if ( delta < 10 )
   1430           dist += delta;
   1431         else if ( delta < 22 )
   1432           dist += 10;
   1433         else if ( delta < 42 )
   1434           dist += delta;
   1435         else if ( delta < 54 )
   1436           dist += 54;
   1437         else
   1438           dist += delta;
   1439       }
   1440     }
   1441     else
   1442     {
   1443       /* strong hinting process: snap the stem width to integer pixels */
   1444 
   1445       dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );
   1446 
   1447       if ( vertical )
   1448       {
   1449         /* in the case of vertical hinting, always round */
   1450         /* the stem heights to integer pixels            */
   1451 
   1452         if ( dist >= 64 )
   1453           dist = ( dist + 16 ) & ~63;
   1454         else
   1455           dist = 64;
   1456       }
   1457       else
   1458       {
   1459         if ( AF_LATIN_HINTS_DO_MONO( hints ) )
   1460         {
   1461           /* monochrome horizontal hinting: snap widths to integer pixels */
   1462           /* with a different threshold                                   */
   1463 
   1464           if ( dist < 64 )
   1465             dist = 64;
   1466           else
   1467             dist = ( dist + 32 ) & ~63;
   1468         }
   1469         else
   1470         {
   1471           /* for horizontal anti-aliased hinting, we adopt a more subtle */
   1472           /* approach: we strengthen small stems, round stems whose size */
   1473           /* is between 1 and 2 pixels to an integer, otherwise nothing  */
   1474 
   1475           if ( dist < 48 )
   1476             dist = ( dist + 64 ) >> 1;
   1477 
   1478           else if ( dist < 128 )
   1479             dist = ( dist + 22 ) & ~63;
   1480           else
   1481             /* round otherwise to prevent color fringes in LCD mode */
   1482             dist = ( dist + 32 ) & ~63;
   1483         }
   1484       }
   1485     }
   1486 
   1487   Done_Width:
   1488     if ( sign )
   1489       dist = -dist;
   1490 
   1491     return dist;
   1492   }
   1493 
   1494 
   1495   /* align one stem edge relative to the previous stem edge */
   1496 
   1497   static void
   1498   af_cjk_align_linked_edge( AF_GlyphHints  hints,
   1499                             AF_Dimension   dim,
   1500                             AF_Edge        base_edge,
   1501                             AF_Edge        stem_edge )
   1502   {
   1503     FT_Pos  dist = stem_edge->opos - base_edge->opos;
   1504 
   1505     FT_Pos  fitted_width = af_cjk_compute_stem_width(
   1506                              hints, dim, dist,
   1507                              (AF_Edge_Flags)base_edge->flags,
   1508                              (AF_Edge_Flags)stem_edge->flags );
   1509 
   1510 
   1511     stem_edge->pos = base_edge->pos + fitted_width;
   1512   }
   1513 
   1514 
   1515   static void
   1516   af_cjk_align_serif_edge( AF_GlyphHints  hints,
   1517                            AF_Edge        base,
   1518                            AF_Edge        serif )
   1519   {
   1520     FT_UNUSED( hints );
   1521 
   1522     serif->pos = base->pos + ( serif->opos - base->opos );
   1523   }
   1524 
   1525 
   1526   /*************************************************************************/
   1527   /*************************************************************************/
   1528   /*************************************************************************/
   1529   /****                                                                 ****/
   1530   /****                    E D G E   H I N T I N G                      ****/
   1531   /****                                                                 ****/
   1532   /*************************************************************************/
   1533   /*************************************************************************/
   1534   /*************************************************************************/
   1535 
   1536 
   1537 #define AF_LIGHT_MODE_MAX_HORZ_GAP    9
   1538 #define AF_LIGHT_MODE_MAX_VERT_GAP   15
   1539 #define AF_LIGHT_MODE_MAX_DELTA_ABS  14
   1540 
   1541 
   1542   static FT_Pos
   1543   af_hint_normal_stem( AF_GlyphHints  hints,
   1544                        AF_Edge        edge,
   1545                        AF_Edge        edge2,
   1546                        FT_Pos         anchor,
   1547                        AF_Dimension   dim )
   1548   {
   1549     FT_Pos  org_len, cur_len, org_center;
   1550     FT_Pos  cur_pos1, cur_pos2;
   1551     FT_Pos  d_off1, u_off1, d_off2, u_off2, delta;
   1552     FT_Pos  offset;
   1553     FT_Pos  threshold = 64;
   1554 
   1555 
   1556     if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
   1557     {
   1558       if ( ( edge->flags  & AF_EDGE_ROUND ) &&
   1559            ( edge2->flags & AF_EDGE_ROUND ) )
   1560       {
   1561         if ( dim == AF_DIMENSION_VERT )
   1562           threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;
   1563         else
   1564           threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;
   1565       }
   1566       else
   1567       {
   1568         if ( dim == AF_DIMENSION_VERT )
   1569           threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;
   1570         else
   1571           threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;
   1572       }
   1573     }
   1574 
   1575     org_len    = edge2->opos - edge->opos;
   1576     cur_len    = af_cjk_compute_stem_width( hints, dim, org_len,
   1577                                             (AF_Edge_Flags)edge->flags,
   1578                                             (AF_Edge_Flags)edge2->flags );
   1579 
   1580     org_center = ( edge->opos + edge2->opos ) / 2 + anchor;
   1581     cur_pos1   = org_center - cur_len / 2;
   1582     cur_pos2   = cur_pos1 + cur_len;
   1583     d_off1     = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );
   1584     d_off2     = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );
   1585     u_off1     = 64 - d_off1;
   1586     u_off2     = 64 - d_off2;
   1587     delta      = 0;
   1588 
   1589 
   1590     if ( d_off1 == 0 || d_off2 == 0 )
   1591       goto Exit;
   1592 
   1593     if ( cur_len <= threshold )
   1594     {
   1595       if ( d_off2 < cur_len )
   1596       {
   1597         if ( u_off1 <= d_off2 )
   1598           delta =  u_off1;
   1599         else
   1600           delta = -d_off2;
   1601       }
   1602 
   1603       goto Exit;
   1604     }
   1605 
   1606     if ( threshold < 64 )
   1607     {
   1608       if ( d_off1 >= threshold || u_off1 >= threshold ||
   1609            d_off2 >= threshold || u_off2 >= threshold )
   1610         goto Exit;
   1611     }
   1612 
   1613     offset = cur_len & 63;
   1614 
   1615     if ( offset < 32 )
   1616     {
   1617       if ( u_off1 <= offset || d_off2 <= offset )
   1618         goto Exit;
   1619     }
   1620     else
   1621       offset = 64 - threshold;
   1622 
   1623     d_off1 = threshold - u_off1;
   1624     u_off1 = u_off1    - offset;
   1625     u_off2 = threshold - d_off2;
   1626     d_off2 = d_off2    - offset;
   1627 
   1628     if ( d_off1 <= u_off1 )
   1629       u_off1 = -d_off1;
   1630 
   1631     if ( d_off2 <= u_off2 )
   1632       u_off2 = -d_off2;
   1633 
   1634     if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )
   1635       delta = u_off1;
   1636     else
   1637       delta = u_off2;
   1638 
   1639   Exit:
   1640 
   1641 #if 1
   1642     if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
   1643     {
   1644       if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )
   1645         delta = AF_LIGHT_MODE_MAX_DELTA_ABS;
   1646       else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )
   1647         delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;
   1648     }
   1649 #endif
   1650 
   1651     cur_pos1 += delta;
   1652 
   1653     if ( edge->opos < edge2->opos )
   1654     {
   1655       edge->pos  = cur_pos1;
   1656       edge2->pos = cur_pos1 + cur_len;
   1657     }
   1658     else
   1659     {
   1660       edge->pos  = cur_pos1 + cur_len;
   1661       edge2->pos = cur_pos1;
   1662     }
   1663 
   1664     return delta;
   1665   }
   1666 
   1667 
   1668   static void
   1669   af_cjk_hint_edges( AF_GlyphHints  hints,
   1670                      AF_Dimension   dim )
   1671   {
   1672     AF_AxisHints  axis       = &hints->axis[dim];
   1673     AF_Edge       edges      = axis->edges;
   1674     AF_Edge       edge_limit = edges + axis->num_edges;
   1675     FT_PtrDist    n_edges;
   1676     AF_Edge       edge;
   1677     AF_Edge       anchor   = 0;
   1678     FT_Pos        delta    = 0;
   1679     FT_Int        skipped  = 0;
   1680     FT_Bool       has_last_stem = FALSE;
   1681     FT_Pos        last_stem_pos = 0;
   1682 
   1683 
   1684     /* we begin by aligning all stems relative to the blue zone */
   1685     FT_TRACE5(( "==== cjk hinting %s edges =====\n",
   1686           dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));
   1687 
   1688     if ( AF_HINTS_DO_BLUES( hints ) )
   1689     {
   1690       for ( edge = edges; edge < edge_limit; edge++ )
   1691       {
   1692         AF_Width  blue;
   1693         AF_Edge   edge1, edge2;
   1694 
   1695 
   1696         if ( edge->flags & AF_EDGE_DONE )
   1697           continue;
   1698 
   1699         blue  = edge->blue_edge;
   1700         edge1 = NULL;
   1701         edge2 = edge->link;
   1702 
   1703         if ( blue )
   1704         {
   1705           edge1 = edge;
   1706         }
   1707         else if ( edge2 && edge2->blue_edge )
   1708         {
   1709           blue  = edge2->blue_edge;
   1710           edge1 = edge2;
   1711           edge2 = edge;
   1712         }
   1713 
   1714         if ( !edge1 )
   1715           continue;
   1716 
   1717         FT_TRACE5(( "CJKBLUE: edge %d @%d (opos=%.2f) snapped to (%.2f), "
   1718                  "was (%.2f)\n",
   1719                  edge1-edges, edge1->fpos, edge1->opos / 64.0, blue->fit / 64.0,
   1720                  edge1->pos / 64.0 ));
   1721 
   1722         edge1->pos    = blue->fit;
   1723         edge1->flags |= AF_EDGE_DONE;
   1724 
   1725         if ( edge2 && !edge2->blue_edge )
   1726         {
   1727           af_cjk_align_linked_edge( hints, dim, edge1, edge2 );
   1728           edge2->flags |= AF_EDGE_DONE;
   1729         }
   1730 
   1731         if ( !anchor )
   1732           anchor = edge;
   1733       }
   1734     }
   1735 
   1736     /* now we align all stem edges. */
   1737     for ( edge = edges; edge < edge_limit; edge++ )
   1738     {
   1739       AF_Edge  edge2;
   1740 
   1741 
   1742       if ( edge->flags & AF_EDGE_DONE )
   1743         continue;
   1744 
   1745       /* skip all non-stem edges */
   1746       edge2 = edge->link;
   1747       if ( !edge2 )
   1748       {
   1749         skipped++;
   1750         continue;
   1751       }
   1752 
   1753       /* Some CJK characters have so many stems that
   1754        * the hinter is likely to merge two adjacent ones.
   1755        * To solve this problem, if either edge of a stem
   1756        * is too close to the previous one, we avoid
   1757        * aligning the two edges, but rather interpolate
   1758        * their locations at the end of this function in
   1759        * order to preserve the space between the stems.
   1760        */
   1761       if ( has_last_stem                       &&
   1762            ( edge->pos  < last_stem_pos + 64 ||
   1763              edge2->pos < last_stem_pos + 64 ) )
   1764       {
   1765         skipped++;
   1766         continue;
   1767       }
   1768 
   1769       /* now align the stem */
   1770       /* this should not happen, but it's better to be safe */
   1771       if ( edge2->blue_edge )
   1772       {
   1773         FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
   1774 
   1775         af_cjk_align_linked_edge( hints, dim, edge2, edge );
   1776         edge->flags |= AF_EDGE_DONE;
   1777         continue;
   1778       }
   1779 
   1780       if ( edge2 < edge )
   1781       {
   1782         af_cjk_align_linked_edge( hints, dim, edge2, edge );
   1783         edge->flags |= AF_EDGE_DONE;
   1784         /* We rarely reaches here it seems;
   1785          * usually the two edges belonging
   1786          * to one stem are marked as DONE together
   1787          */
   1788         has_last_stem = TRUE;
   1789         last_stem_pos = edge->pos;
   1790         continue;
   1791       }
   1792 
   1793       if ( dim != AF_DIMENSION_VERT && !anchor )
   1794       {
   1795 
   1796 #if 0
   1797         if ( fixedpitch )
   1798         {
   1799           AF_Edge     left  = edge;
   1800           AF_Edge     right = edge_limit - 1;
   1801           AF_EdgeRec  left1, left2, right1, right2;
   1802           FT_Pos      target, center1, center2;
   1803           FT_Pos      delta1, delta2, d1, d2;
   1804 
   1805 
   1806           while ( right > left && !right->link )
   1807             right--;
   1808 
   1809           left1  = *left;
   1810           left2  = *left->link;
   1811           right1 = *right->link;
   1812           right2 = *right;
   1813 
   1814           delta  = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
   1815           target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;
   1816 
   1817           delta1  = delta;
   1818           delta1 += af_hint_normal_stem( hints, left, left->link,
   1819                                          delta1, 0 );
   1820 
   1821           if ( left->link != right )
   1822             af_hint_normal_stem( hints, right->link, right, delta1, 0 );
   1823 
   1824           center1 = left->pos + ( right->pos - left->pos ) / 2;
   1825 
   1826           if ( center1 >= target )
   1827             delta2 = delta - 32;
   1828           else
   1829             delta2 = delta + 32;
   1830 
   1831           delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );
   1832 
   1833           if ( delta1 != delta2 )
   1834           {
   1835             if ( left->link != right )
   1836               af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );
   1837 
   1838             center2 = left1.pos + ( right2.pos - left1.pos ) / 2;
   1839 
   1840             d1 = center1 - target;
   1841             d2 = center2 - target;
   1842 
   1843             if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
   1844             {
   1845               left->pos       = left1.pos;
   1846               left->link->pos = left2.pos;
   1847 
   1848               if ( left->link != right )
   1849               {
   1850                 right->link->pos = right1.pos;
   1851                 right->pos       = right2.pos;
   1852               }
   1853 
   1854               delta1 = delta2;
   1855             }
   1856           }
   1857 
   1858           delta               = delta1;
   1859           right->link->flags |= AF_EDGE_DONE;
   1860           right->flags       |= AF_EDGE_DONE;
   1861         }
   1862         else
   1863 
   1864 #endif /* 0 */
   1865 
   1866           delta = af_hint_normal_stem( hints, edge, edge2, 0,
   1867                                        AF_DIMENSION_HORZ );
   1868       }
   1869       else
   1870         af_hint_normal_stem( hints, edge, edge2, delta, dim );
   1871 
   1872 #if 0
   1873       printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
   1874                edge - edges, edge2 - edges,
   1875                ( edge->pos - edge->opos ) / 64.0,
   1876                ( edge2->pos - edge2->opos ) / 64.0 );
   1877 #endif
   1878 
   1879       anchor = edge;
   1880       edge->flags  |= AF_EDGE_DONE;
   1881       edge2->flags |= AF_EDGE_DONE;
   1882       has_last_stem = TRUE;
   1883       last_stem_pos = edge2->pos;
   1884     }
   1885 
   1886     /* make sure that lowercase m's maintain their symmetry */
   1887 
   1888     /* In general, lowercase m's have six vertical edges if they are sans */
   1889     /* serif, or twelve if they are with serifs.  This implementation is  */
   1890     /* based on that assumption, and seems to work very well with most    */
   1891     /* faces.  However, if for a certain face this assumption is not      */
   1892     /* true, the m is just rendered like before.  In addition, any stem   */
   1893     /* correction will only be applied to symmetrical glyphs (even if the */
   1894     /* glyph is not an m), so the potential for unwanted distortion is    */
   1895     /* relatively low.                                                    */
   1896 
   1897     /* We don't handle horizontal edges since we can't easily assure that */
   1898     /* the third (lowest) stem aligns with the base line; it might end up */
   1899     /* one pixel higher or lower.                                         */
   1900 
   1901     n_edges = edge_limit - edges;
   1902     if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
   1903     {
   1904       AF_Edge  edge1, edge2, edge3;
   1905       FT_Pos   dist1, dist2, span;
   1906 
   1907 
   1908       if ( n_edges == 6 )
   1909       {
   1910         edge1 = edges;
   1911         edge2 = edges + 2;
   1912         edge3 = edges + 4;
   1913       }
   1914       else
   1915       {
   1916         edge1 = edges + 1;
   1917         edge2 = edges + 5;
   1918         edge3 = edges + 9;
   1919       }
   1920 
   1921       dist1 = edge2->opos - edge1->opos;
   1922       dist2 = edge3->opos - edge2->opos;
   1923 
   1924       span = dist1 - dist2;
   1925       if ( span < 0 )
   1926         span = -span;
   1927 
   1928       if ( edge1->link == edge1 + 1 &&
   1929            edge2->link == edge2 + 1 &&
   1930            edge3->link == edge3 + 1 && span < 8 )
   1931       {
   1932         delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
   1933         edge3->pos -= delta;
   1934         if ( edge3->link )
   1935           edge3->link->pos -= delta;
   1936 
   1937         /* move the serifs along with the stem */
   1938         if ( n_edges == 12 )
   1939         {
   1940           ( edges + 8 )->pos -= delta;
   1941           ( edges + 11 )->pos -= delta;
   1942         }
   1943 
   1944         edge3->flags |= AF_EDGE_DONE;
   1945         if ( edge3->link )
   1946           edge3->link->flags |= AF_EDGE_DONE;
   1947       }
   1948     }
   1949 
   1950     if ( !skipped )
   1951       return;
   1952 
   1953     /*
   1954      *  now hint the remaining edges (serifs and single) in order
   1955      *  to complete our processing
   1956      */
   1957     for ( edge = edges; edge < edge_limit; edge++ )
   1958     {
   1959       if ( edge->flags & AF_EDGE_DONE )
   1960         continue;
   1961 
   1962       if ( edge->serif )
   1963       {
   1964         af_cjk_align_serif_edge( hints, edge->serif, edge );
   1965         edge->flags |= AF_EDGE_DONE;
   1966         skipped--;
   1967       }
   1968     }
   1969 
   1970     if ( !skipped )
   1971       return;
   1972 
   1973     for ( edge = edges; edge < edge_limit; edge++ )
   1974     {
   1975       AF_Edge  before, after;
   1976 
   1977 
   1978       if ( edge->flags & AF_EDGE_DONE )
   1979         continue;
   1980 
   1981       before = after = edge;
   1982 
   1983       while ( --before >= edges )
   1984         if ( before->flags & AF_EDGE_DONE )
   1985           break;
   1986 
   1987       while ( ++after < edge_limit )
   1988         if ( after->flags & AF_EDGE_DONE )
   1989           break;
   1990 
   1991       if ( before >= edges || after < edge_limit )
   1992       {
   1993         if ( before < edges )
   1994           af_cjk_align_serif_edge( hints, after, edge );
   1995         else if ( after >= edge_limit )
   1996           af_cjk_align_serif_edge( hints, before, edge );
   1997         else
   1998         {
   1999           if ( after->fpos == before->fpos )
   2000             edge->pos = before->pos;
   2001           else
   2002             edge->pos = before->pos +
   2003                         FT_MulDiv( edge->fpos - before->fpos,
   2004                                    after->pos - before->pos,
   2005                                    after->fpos - before->fpos );
   2006         }
   2007       }
   2008     }
   2009   }
   2010 
   2011 
   2012   static void
   2013   af_cjk_align_edge_points( AF_GlyphHints  hints,
   2014                             AF_Dimension   dim )
   2015   {
   2016     AF_AxisHints  axis       = & hints->axis[dim];
   2017     AF_Edge       edges      = axis->edges;
   2018     AF_Edge       edge_limit = edges + axis->num_edges;
   2019     AF_Edge       edge;
   2020     FT_Bool       snapping;
   2021 
   2022 
   2023     snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ             &&
   2024                           AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) )  ||
   2025                         ( dim == AF_DIMENSION_VERT             &&
   2026                           AF_LATIN_HINTS_DO_VERT_SNAP( hints ) )  );
   2027 
   2028     for ( edge = edges; edge < edge_limit; edge++ )
   2029     {
   2030       /* move the points of each segment     */
   2031       /* in each edge to the edge's position */
   2032       AF_Segment  seg = edge->first;
   2033 
   2034 
   2035       if ( snapping )
   2036       {
   2037         do
   2038         {
   2039           AF_Point  point = seg->first;
   2040 
   2041 
   2042           for (;;)
   2043           {
   2044             if ( dim == AF_DIMENSION_HORZ )
   2045             {
   2046               point->x      = edge->pos;
   2047               point->flags |= AF_FLAG_TOUCH_X;
   2048             }
   2049             else
   2050             {
   2051               point->y      = edge->pos;
   2052               point->flags |= AF_FLAG_TOUCH_Y;
   2053             }
   2054 
   2055             if ( point == seg->last )
   2056               break;
   2057 
   2058             point = point->next;
   2059           }
   2060 
   2061           seg = seg->edge_next;
   2062 
   2063         } while ( seg != edge->first );
   2064       }
   2065       else
   2066       {
   2067         FT_Pos  delta = edge->pos - edge->opos;
   2068 
   2069 
   2070         do
   2071         {
   2072           AF_Point  point = seg->first;
   2073 
   2074 
   2075           for (;;)
   2076           {
   2077             if ( dim == AF_DIMENSION_HORZ )
   2078             {
   2079               point->x     += delta;
   2080               point->flags |= AF_FLAG_TOUCH_X;
   2081             }
   2082             else
   2083             {
   2084               point->y     += delta;
   2085               point->flags |= AF_FLAG_TOUCH_Y;
   2086             }
   2087 
   2088             if ( point == seg->last )
   2089               break;
   2090 
   2091             point = point->next;
   2092           }
   2093 
   2094           seg = seg->edge_next;
   2095 
   2096         } while ( seg != edge->first );
   2097       }
   2098     }
   2099   }
   2100 
   2101 
   2102   FT_LOCAL_DEF( FT_Error )
   2103   af_cjk_hints_apply( AF_GlyphHints  hints,
   2104                       FT_Outline*    outline,
   2105                       AF_CJKMetrics  metrics )
   2106   {
   2107     FT_Error  error;
   2108     int       dim;
   2109 
   2110     FT_UNUSED( metrics );
   2111 
   2112 
   2113     error = af_glyph_hints_reload( hints, outline );
   2114     if ( error )
   2115       goto Exit;
   2116 
   2117     /* analyze glyph outline */
   2118     if ( AF_HINTS_DO_HORIZONTAL( hints ) )
   2119     {
   2120       error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
   2121       if ( error )
   2122         goto Exit;
   2123 
   2124       af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ );
   2125     }
   2126 
   2127     if ( AF_HINTS_DO_VERTICAL( hints ) )
   2128     {
   2129       error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
   2130       if ( error )
   2131         goto Exit;
   2132 
   2133       af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT );
   2134     }
   2135 
   2136     /* grid-fit the outline */
   2137     for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
   2138     {
   2139       if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
   2140            ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) )   )
   2141       {
   2142 
   2143 #ifdef AF_CONFIG_OPTION_USE_WARPER
   2144         if ( dim == AF_DIMENSION_HORZ                                  &&
   2145              metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL )
   2146         {
   2147           AF_WarperRec  warper;
   2148           FT_Fixed      scale;
   2149           FT_Pos        delta;
   2150 
   2151 
   2152           af_warper_compute( &warper, hints, (AF_Dimension)dim,
   2153                              &scale, &delta );
   2154           af_glyph_hints_scale_dim( hints, (AF_Dimension)dim,
   2155                                     scale, delta );
   2156           continue;
   2157         }
   2158 #endif /* AF_CONFIG_OPTION_USE_WARPER */
   2159 
   2160         af_cjk_hint_edges( hints, (AF_Dimension)dim );
   2161         af_cjk_align_edge_points( hints, (AF_Dimension)dim );
   2162         af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
   2163         af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
   2164       }
   2165     }
   2166 
   2167 #if 0
   2168     af_glyph_hints_dump_points( hints );
   2169     af_glyph_hints_dump_segments( hints );
   2170     af_glyph_hints_dump_edges( hints );
   2171 #endif
   2172 
   2173     af_glyph_hints_save( hints, outline );
   2174 
   2175   Exit:
   2176     return error;
   2177   }
   2178 
   2179 
   2180   /*************************************************************************/
   2181   /*************************************************************************/
   2182   /*****                                                               *****/
   2183   /*****                C J K   S C R I P T   C L A S S                *****/
   2184   /*****                                                               *****/
   2185   /*************************************************************************/
   2186   /*************************************************************************/
   2187 
   2188 
   2189   /* this corresponds to Unicode 6.0 */
   2190 
   2191   static const AF_Script_UniRangeRec  af_cjk_uniranges[] =
   2192   {
   2193     AF_UNIRANGE_REC(  0x2E80UL,  0x2EFFUL ),  /* CJK Radicals Supplement                 */
   2194     AF_UNIRANGE_REC(  0x2F00UL,  0x2FDFUL ),  /* Kangxi Radicals                         */
   2195     AF_UNIRANGE_REC(  0x2FF0UL,  0x2FFFUL ),  /* Ideographic Description Characters      */
   2196     AF_UNIRANGE_REC(  0x3000UL,  0x303FUL ),  /* CJK Symbols and Punctuation             */
   2197     AF_UNIRANGE_REC(  0x3040UL,  0x309FUL ),  /* Hiragana                                */
   2198     AF_UNIRANGE_REC(  0x30A0UL,  0x30FFUL ),  /* Katakana                                */
   2199     AF_UNIRANGE_REC(  0x3100UL,  0x312FUL ),  /* Bopomofo                                */
   2200     AF_UNIRANGE_REC(  0x3130UL,  0x318FUL ),  /* Hangul Compatibility Jamo               */
   2201     AF_UNIRANGE_REC(  0x3190UL,  0x319FUL ),  /* Kanbun                                  */
   2202     AF_UNIRANGE_REC(  0x31A0UL,  0x31BFUL ),  /* Bopomofo Extended                       */
   2203     AF_UNIRANGE_REC(  0x31C0UL,  0x31EFUL ),  /* CJK Strokes                             */
   2204     AF_UNIRANGE_REC(  0x31F0UL,  0x31FFUL ),  /* Katakana Phonetic Extensions            */
   2205     AF_UNIRANGE_REC(  0x3200UL,  0x32FFUL ),  /* Enclosed CJK Letters and Months         */
   2206     AF_UNIRANGE_REC(  0x3300UL,  0x33FFUL ),  /* CJK Compatibility                       */
   2207     AF_UNIRANGE_REC(  0x3400UL,  0x4DBFUL ),  /* CJK Unified Ideographs Extension A      */
   2208     AF_UNIRANGE_REC(  0x4DC0UL,  0x4DFFUL ),  /* Yijing Hexagram Symbols                 */
   2209     AF_UNIRANGE_REC(  0x4E00UL,  0x9FFFUL ),  /* CJK Unified Ideographs                  */
   2210     AF_UNIRANGE_REC(  0xA960UL,  0xA97FUL ),  /* Hangul Jamo Extended-A                  */
   2211     AF_UNIRANGE_REC(  0xAC00UL,  0xD7AFUL ),  /* Hangul Syllables                        */
   2212     AF_UNIRANGE_REC(  0xD7B0UL,  0xD7FFUL ),  /* Hangul Jamo Extended-B                  */
   2213     AF_UNIRANGE_REC(  0xF900UL,  0xFAFFUL ),  /* CJK Compatibility Ideographs            */
   2214     AF_UNIRANGE_REC(  0xFE10UL,  0xFE1FUL ),  /* Vertical forms                          */
   2215     AF_UNIRANGE_REC(  0xFE30UL,  0xFE4FUL ),  /* CJK Compatibility Forms                 */
   2216     AF_UNIRANGE_REC(  0xFF00UL,  0xFFEFUL ),  /* Halfwidth and Fullwidth Forms           */
   2217     AF_UNIRANGE_REC( 0x1B000UL, 0x1B0FFUL ),  /* Kana Supplement                         */
   2218     AF_UNIRANGE_REC( 0x1D300UL, 0x1D35FUL ),  /* Tai Xuan Hing Symbols                   */
   2219     AF_UNIRANGE_REC( 0x1F200UL, 0x1F2FFUL ),  /* Enclosed Ideographic Supplement         */
   2220     AF_UNIRANGE_REC( 0x20000UL, 0x2A6DFUL ),  /* CJK Unified Ideographs Extension B      */
   2221     AF_UNIRANGE_REC( 0x2A700UL, 0x2B73FUL ),  /* CJK Unified Ideographs Extension C      */
   2222     AF_UNIRANGE_REC( 0x2B740UL, 0x2B81FUL ),  /* CJK Unified Ideographs Extension D      */
   2223     AF_UNIRANGE_REC( 0x2F800UL, 0x2FA1FUL ),  /* CJK Compatibility Ideographs Supplement */
   2224     AF_UNIRANGE_REC(       0UL,       0UL )
   2225   };
   2226 
   2227 
   2228   AF_DEFINE_SCRIPT_CLASS( af_cjk_script_class,
   2229     AF_SCRIPT_CJK,
   2230     af_cjk_uniranges,
   2231 
   2232     sizeof ( AF_CJKMetricsRec ),
   2233 
   2234     (AF_Script_InitMetricsFunc) af_cjk_metrics_init,
   2235     (AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale,
   2236     (AF_Script_DoneMetricsFunc) NULL,
   2237 
   2238     (AF_Script_InitHintsFunc)   af_cjk_hints_init,
   2239     (AF_Script_ApplyHintsFunc)  af_cjk_hints_apply
   2240   )
   2241 
   2242 #else /* !AF_CONFIG_OPTION_CJK */
   2243 
   2244   static const AF_Script_UniRangeRec  af_cjk_uniranges[] =
   2245   {
   2246     AF_UNIRANGE_REC( 0UL, 0UL )
   2247   };
   2248 
   2249 
   2250   AF_DEFINE_SCRIPT_CLASS( af_cjk_script_class,
   2251     AF_SCRIPT_CJK,
   2252     af_cjk_uniranges,
   2253 
   2254     sizeof ( AF_CJKMetricsRec ),
   2255 
   2256     (AF_Script_InitMetricsFunc) NULL,
   2257     (AF_Script_ScaleMetricsFunc)NULL,
   2258     (AF_Script_DoneMetricsFunc) NULL,
   2259 
   2260     (AF_Script_InitHintsFunc)   NULL,
   2261     (AF_Script_ApplyHintsFunc)  NULL
   2262   )
   2263 
   2264 #endif /* !AF_CONFIG_OPTION_CJK */
   2265 
   2266 
   2267 /* END */
   2268