1/***************************************************************************/
2/*                                                                         */
3/*  aflatin2.c                                                             */
4/*                                                                         */
5/*    Auto-fitter hinting routines for latin script (body).                */
6/*                                                                         */
7/*  Copyright 2003-2011 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#include FT_ADVANCES_H
20
21#include "aflatin.h"
22#include "aflatin2.h"
23#include "aferrors.h"
24
25
26#ifdef AF_CONFIG_OPTION_USE_WARPER
27#include "afwarp.h"
28#endif
29
30
31  /*************************************************************************/
32  /*                                                                       */
33  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
34  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
35  /* messages during execution.                                            */
36  /*                                                                       */
37#undef  FT_COMPONENT
38#define FT_COMPONENT  trace_aflatin2
39
40
41  FT_LOCAL_DEF( FT_Error )
42  af_latin2_hints_compute_segments( AF_GlyphHints  hints,
43                                    AF_Dimension   dim );
44
45  FT_LOCAL_DEF( void )
46  af_latin2_hints_link_segments( AF_GlyphHints  hints,
47                                 AF_Dimension   dim );
48
49  /*************************************************************************/
50  /*************************************************************************/
51  /*****                                                               *****/
52  /*****            L A T I N   G L O B A L   M E T R I C S            *****/
53  /*****                                                               *****/
54  /*************************************************************************/
55  /*************************************************************************/
56
57  FT_LOCAL_DEF( void )
58  af_latin2_metrics_init_widths( AF_LatinMetrics  metrics,
59                                 FT_Face          face,
60                                 FT_ULong         charcode )
61  {
62    /* scan the array of segments in each direction */
63    AF_GlyphHintsRec  hints[1];
64
65
66    af_glyph_hints_init( hints, face->memory );
67
68    metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
69    metrics->axis[AF_DIMENSION_VERT].width_count = 0;
70
71    {
72      FT_Error             error;
73      FT_UInt              glyph_index;
74      int                  dim;
75      AF_LatinMetricsRec   dummy[1];
76      AF_Scaler            scaler = &dummy->root.scaler;
77
78
79      glyph_index = FT_Get_Char_Index( face, charcode );
80      if ( glyph_index == 0 )
81        goto Exit;
82
83      error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
84      if ( error || face->glyph->outline.n_points <= 0 )
85        goto Exit;
86
87      FT_ZERO( dummy );
88
89      dummy->units_per_em = metrics->units_per_em;
90      scaler->x_scale     = scaler->y_scale = 0x10000L;
91      scaler->x_delta     = scaler->y_delta = 0;
92      scaler->face        = face;
93      scaler->render_mode = FT_RENDER_MODE_NORMAL;
94      scaler->flags       = 0;
95
96      af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy );
97
98      error = af_glyph_hints_reload( hints, &face->glyph->outline );
99      if ( error )
100        goto Exit;
101
102      for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
103      {
104        AF_LatinAxis  axis    = &metrics->axis[dim];
105        AF_AxisHints  axhints = &hints->axis[dim];
106        AF_Segment    seg, limit, link;
107        FT_UInt       num_widths = 0;
108
109
110        error = af_latin2_hints_compute_segments( hints,
111                                                 (AF_Dimension)dim );
112        if ( error )
113          goto Exit;
114
115        af_latin2_hints_link_segments( hints,
116                                      (AF_Dimension)dim );
117
118        seg   = axhints->segments;
119        limit = seg + axhints->num_segments;
120
121        for ( ; seg < limit; seg++ )
122        {
123          link = seg->link;
124
125          /* we only consider stem segments there! */
126          if ( link && link->link == seg && link > seg )
127          {
128            FT_Pos  dist;
129
130
131            dist = seg->pos - link->pos;
132            if ( dist < 0 )
133              dist = -dist;
134
135            if ( num_widths < AF_LATIN_MAX_WIDTHS )
136              axis->widths[num_widths++].org = dist;
137          }
138        }
139
140        af_sort_widths( num_widths, axis->widths );
141        axis->width_count = num_widths;
142      }
143
144  Exit:
145      for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
146      {
147        AF_LatinAxis  axis = &metrics->axis[dim];
148        FT_Pos        stdw;
149
150
151        stdw = ( axis->width_count > 0 )
152                 ? axis->widths[0].org
153                 : AF_LATIN_CONSTANT( metrics, 50 );
154
155        /* let's try 20% of the smallest width */
156        axis->edge_distance_threshold = stdw / 5;
157        axis->standard_width          = stdw;
158        axis->extra_light             = 0;
159      }
160    }
161
162    af_glyph_hints_done( hints );
163  }
164
165
166
167#define AF_LATIN_MAX_TEST_CHARACTERS  12
168
169
170  static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES]
171                                        [AF_LATIN_MAX_TEST_CHARACTERS+1] =
172  {
173    "THEZOCQS",
174    "HEZLOCUS",
175    "fijkdbh",
176    "xzroesc",
177    "xzroesc",
178    "pqgjy"
179  };
180
181
182  static void
183  af_latin2_metrics_init_blues( AF_LatinMetrics  metrics,
184                                FT_Face          face )
185  {
186    FT_Pos        flats [AF_LATIN_MAX_TEST_CHARACTERS];
187    FT_Pos        rounds[AF_LATIN_MAX_TEST_CHARACTERS];
188    FT_Int        num_flats;
189    FT_Int        num_rounds;
190    FT_Int        bb;
191    AF_LatinBlue  blue;
192    FT_Error      error;
193    AF_LatinAxis  axis  = &metrics->axis[AF_DIMENSION_VERT];
194    FT_GlyphSlot  glyph = face->glyph;
195
196
197    /* we compute the blues simply by loading each character from the     */
198    /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */
199    /* bottom-most points (depending on `AF_IS_TOP_BLUE')                 */
200
201    FT_TRACE5(( "blue zones computation\n" ));
202    FT_TRACE5(( "------------------------------------------------\n" ));
203
204    for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
205    {
206      const char*  p     = af_latin2_blue_chars[bb];
207      const char*  limit = p + AF_LATIN_MAX_TEST_CHARACTERS;
208      FT_Pos*      blue_ref;
209      FT_Pos*      blue_shoot;
210
211
212      FT_TRACE5(( "blue %3d: ", bb ));
213
214      num_flats  = 0;
215      num_rounds = 0;
216
217      for ( ; p < limit && *p; p++ )
218      {
219        FT_UInt     glyph_index;
220        FT_Int      best_point, best_y, best_first, best_last;
221        FT_Vector*  points;
222        FT_Bool     round;
223
224
225        FT_TRACE5(( "'%c'", *p ));
226
227        /* load the character in the face -- skip unknown or empty ones */
228        glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p );
229        if ( glyph_index == 0 )
230          continue;
231
232        error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
233        if ( error || glyph->outline.n_points <= 0 )
234          continue;
235
236        /* now compute min or max point indices and coordinates */
237        points      = glyph->outline.points;
238        best_point  = -1;
239        best_y      = 0;  /* make compiler happy */
240        best_first  = 0;  /* ditto */
241        best_last   = 0;  /* ditto */
242
243        {
244          FT_Int  nn;
245          FT_Int  first = 0;
246          FT_Int  last  = -1;
247
248
249          for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )
250          {
251            FT_Int  old_best_point = best_point;
252            FT_Int  pp;
253
254
255            last = glyph->outline.contours[nn];
256
257            /* Avoid single-point contours since they are never rasterized. */
258            /* In some fonts, they correspond to mark attachment points     */
259            /* which are way outside of the glyph's real outline.           */
260            if ( last == first )
261                continue;
262
263            if ( AF_LATIN_IS_TOP_BLUE( bb ) )
264            {
265              for ( pp = first; pp <= last; pp++ )
266                if ( best_point < 0 || points[pp].y > best_y )
267                {
268                  best_point = pp;
269                  best_y     = points[pp].y;
270                }
271            }
272            else
273            {
274              for ( pp = first; pp <= last; pp++ )
275                if ( best_point < 0 || points[pp].y < best_y )
276                {
277                  best_point = pp;
278                  best_y     = points[pp].y;
279                }
280            }
281
282            if ( best_point != old_best_point )
283            {
284              best_first = first;
285              best_last  = last;
286            }
287          }
288          FT_TRACE5(( "%5d", best_y ));
289        }
290
291        /* now check whether the point belongs to a straight or round   */
292        /* segment; we first need to find in which contour the extremum */
293        /* lies, then inspect its previous and next points              */
294        {
295          FT_Int  start, end, prev, next;
296          FT_Pos  dist;
297
298
299          /* now look for the previous and next points that are not on the */
300          /* same Y coordinate.  Threshold the `closeness'...              */
301          start = end = best_point;
302
303          do
304          {
305            prev = start-1;
306            if ( prev < best_first )
307              prev = best_last;
308
309            dist = points[prev].y - best_y;
310            if ( dist < -5 || dist > 5 )
311              break;
312
313            start = prev;
314
315          } while ( start != best_point );
316
317          do
318          {
319            next = end+1;
320            if ( next > best_last )
321              next = best_first;
322
323            dist = points[next].y - best_y;
324            if ( dist < -5 || dist > 5 )
325              break;
326
327            end = next;
328
329          } while ( end != best_point );
330
331          /* now, set the `round' flag depending on the segment's kind */
332          round = FT_BOOL(
333            FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON ||
334            FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON );
335
336          FT_TRACE5(( "%c ", round ? 'r' : 'f' ));
337        }
338
339        if ( round )
340          rounds[num_rounds++] = best_y;
341        else
342          flats[num_flats++]   = best_y;
343      }
344
345      FT_TRACE5(( "\n" ));
346
347      if ( num_flats == 0 && num_rounds == 0 )
348      {
349        /*
350         *  we couldn't find a single glyph to compute this blue zone,
351         *  we will simply ignore it then
352         */
353        FT_TRACE5(( "empty\n" ));
354        continue;
355      }
356
357      /* we have computed the contents of the `rounds' and `flats' tables, */
358      /* now determine the reference and overshoot position of the blue -- */
359      /* we simply take the median value after a simple sort               */
360      af_sort_pos( num_rounds, rounds );
361      af_sort_pos( num_flats,  flats );
362
363      blue       = & axis->blues[axis->blue_count];
364      blue_ref   = & blue->ref.org;
365      blue_shoot = & blue->shoot.org;
366
367      axis->blue_count++;
368
369      if ( num_flats == 0 )
370      {
371        *blue_ref   =
372        *blue_shoot = rounds[num_rounds / 2];
373      }
374      else if ( num_rounds == 0 )
375      {
376        *blue_ref   =
377        *blue_shoot = flats[num_flats / 2];
378      }
379      else
380      {
381        *blue_ref   = flats[num_flats / 2];
382        *blue_shoot = rounds[num_rounds / 2];
383      }
384
385      /* there are sometimes problems: if the overshoot position of top     */
386      /* zones is under its reference position, or the opposite for bottom  */
387      /* zones.  We must thus check everything there and correct the errors */
388      if ( *blue_shoot != *blue_ref )
389      {
390        FT_Pos   ref      = *blue_ref;
391        FT_Pos   shoot    = *blue_shoot;
392        FT_Bool  over_ref = FT_BOOL( shoot > ref );
393
394
395        if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )
396          *blue_shoot = *blue_ref = ( shoot + ref ) / 2;
397      }
398
399      blue->flags = 0;
400      if ( AF_LATIN_IS_TOP_BLUE( bb ) )
401        blue->flags |= AF_LATIN_BLUE_TOP;
402
403      /*
404       * The following flags is used later to adjust the y and x scales
405       * in order to optimize the pixel grid alignment of the top of small
406       * letters.
407       */
408      if ( bb == AF_LATIN_BLUE_SMALL_TOP )
409        blue->flags |= AF_LATIN_BLUE_ADJUSTMENT;
410
411      FT_TRACE5(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot ));
412    }
413
414    return;
415  }
416
417
418  FT_LOCAL_DEF( void )
419  af_latin2_metrics_check_digits( AF_LatinMetrics  metrics,
420                                  FT_Face          face )
421  {
422    FT_UInt   i;
423    FT_Bool   started = 0, same_width = 1;
424    FT_Fixed  advance, old_advance = 0;
425
426
427    /* check whether all ASCII digits have the same advance width; */
428    /* digit `0' is 0x30 in all supported charmaps                 */
429    for ( i = 0x30; i <= 0x39; i++ )
430    {
431      FT_UInt  glyph_index;
432
433
434      glyph_index = FT_Get_Char_Index( face, i );
435      if ( glyph_index == 0 )
436        continue;
437
438      if ( FT_Get_Advance( face, glyph_index,
439                           FT_LOAD_NO_SCALE         |
440                           FT_LOAD_NO_HINTING       |
441                           FT_LOAD_IGNORE_TRANSFORM,
442                           &advance ) )
443        continue;
444
445      if ( started )
446      {
447        if ( advance != old_advance )
448        {
449          same_width = 0;
450          break;
451        }
452      }
453      else
454      {
455        old_advance = advance;
456        started     = 1;
457      }
458    }
459
460    metrics->root.digits_have_same_width = same_width;
461  }
462
463
464  FT_LOCAL_DEF( FT_Error )
465  af_latin2_metrics_init( AF_LatinMetrics  metrics,
466                          FT_Face          face )
467  {
468    FT_Error    error = AF_Err_Ok;
469    FT_CharMap  oldmap = face->charmap;
470    FT_UInt     ee;
471
472    static const FT_Encoding  latin_encodings[] =
473    {
474      FT_ENCODING_UNICODE,
475      FT_ENCODING_APPLE_ROMAN,
476      FT_ENCODING_ADOBE_STANDARD,
477      FT_ENCODING_ADOBE_LATIN_1,
478      FT_ENCODING_NONE  /* end of list */
479    };
480
481
482    metrics->units_per_em = face->units_per_EM;
483
484    /* do we have a latin charmap in there? */
485    for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ )
486    {
487      error = FT_Select_Charmap( face, latin_encodings[ee] );
488      if ( !error )
489        break;
490    }
491
492    if ( !error )
493    {
494      /* For now, compute the standard width and height from the `o'. */
495      af_latin2_metrics_init_widths( metrics, face, 'o' );
496      af_latin2_metrics_init_blues( metrics, face );
497      af_latin2_metrics_check_digits( metrics, face );
498    }
499
500    FT_Set_Charmap( face, oldmap );
501    return AF_Err_Ok;
502  }
503
504
505  static void
506  af_latin2_metrics_scale_dim( AF_LatinMetrics  metrics,
507                               AF_Scaler        scaler,
508                               AF_Dimension     dim )
509  {
510    FT_Fixed      scale;
511    FT_Pos        delta;
512    AF_LatinAxis  axis;
513    FT_UInt       nn;
514
515
516    if ( dim == AF_DIMENSION_HORZ )
517    {
518      scale = scaler->x_scale;
519      delta = scaler->x_delta;
520    }
521    else
522    {
523      scale = scaler->y_scale;
524      delta = scaler->y_delta;
525    }
526
527    axis = &metrics->axis[dim];
528
529    if ( axis->org_scale == scale && axis->org_delta == delta )
530      return;
531
532    axis->org_scale = scale;
533    axis->org_delta = delta;
534
535    /*
536     * correct Y scale to optimize the alignment of the top of small
537     * letters to the pixel grid
538     */
539    if ( dim == AF_DIMENSION_VERT )
540    {
541      AF_LatinAxis  vaxis = &metrics->axis[AF_DIMENSION_VERT];
542      AF_LatinBlue  blue = NULL;
543
544
545      for ( nn = 0; nn < vaxis->blue_count; nn++ )
546      {
547        if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT )
548        {
549          blue = &vaxis->blues[nn];
550          break;
551        }
552      }
553
554      if ( blue )
555      {
556        FT_Pos  scaled = FT_MulFix( blue->shoot.org, scaler->y_scale );
557        FT_Pos  fitted = ( scaled + 40 ) & ~63;
558
559#if 1
560        if ( scaled != fitted )
561        {
562          scale = FT_MulDiv( scale, fitted, scaled );
563          FT_TRACE5(( "== scaled x-top = %.2g"
564                      "  fitted = %.2g, scaling = %.4g\n",
565                      scaled / 64.0, fitted / 64.0,
566                      ( fitted * 1.0 ) / scaled ));
567        }
568#endif
569      }
570    }
571
572    axis->scale = scale;
573    axis->delta = delta;
574
575    if ( dim == AF_DIMENSION_HORZ )
576    {
577      metrics->root.scaler.x_scale = scale;
578      metrics->root.scaler.x_delta = delta;
579    }
580    else
581    {
582      metrics->root.scaler.y_scale = scale;
583      metrics->root.scaler.y_delta = delta;
584    }
585
586    /* scale the standard widths */
587    for ( nn = 0; nn < axis->width_count; nn++ )
588    {
589      AF_Width  width = axis->widths + nn;
590
591
592      width->cur = FT_MulFix( width->org, scale );
593      width->fit = width->cur;
594    }
595
596    /* an extra-light axis corresponds to a standard width that is */
597    /* smaller than 5/8 pixels                                     */
598    axis->extra_light =
599      (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );
600
601    if ( dim == AF_DIMENSION_VERT )
602    {
603      /* scale the blue zones */
604      for ( nn = 0; nn < axis->blue_count; nn++ )
605      {
606        AF_LatinBlue  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_LATIN_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          delta1 = blue->shoot.org - blue->ref.org;
623          delta2 = delta1;
624          if ( delta1 < 0 )
625            delta2 = -delta2;
626
627          delta2 = FT_MulFix( delta2, scale );
628
629          if ( delta2 < 32 )
630            delta2 = 0;
631          else if ( delta2 < 64 )
632            delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
633          else
634            delta2 = FT_PIX_ROUND( delta2 );
635
636          if ( delta1 < 0 )
637            delta2 = -delta2;
638
639          blue->ref.fit   = FT_PIX_ROUND( blue->ref.cur );
640          blue->shoot.fit = blue->ref.fit + delta2;
641
642          FT_TRACE5(( ">> activating blue zone %d:"
643                      "  ref.cur=%.2g ref.fit=%.2g"
644                      "  shoot.cur=%.2g shoot.fit=%.2g\n",
645                      nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0,
646                      blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 ));
647
648          blue->flags |= AF_LATIN_BLUE_ACTIVE;
649        }
650      }
651    }
652  }
653
654
655  FT_LOCAL_DEF( void )
656  af_latin2_metrics_scale( AF_LatinMetrics  metrics,
657                           AF_Scaler        scaler )
658  {
659    metrics->root.scaler.render_mode = scaler->render_mode;
660    metrics->root.scaler.face        = scaler->face;
661
662    af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
663    af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
664  }
665
666
667  /*************************************************************************/
668  /*************************************************************************/
669  /*****                                                               *****/
670  /*****           L A T I N   G L Y P H   A N A L Y S I S             *****/
671  /*****                                                               *****/
672  /*************************************************************************/
673  /*************************************************************************/
674
675#define  SORT_SEGMENTS
676
677  FT_LOCAL_DEF( FT_Error )
678  af_latin2_hints_compute_segments( AF_GlyphHints  hints,
679                                    AF_Dimension   dim )
680  {
681    AF_AxisHints  axis          = &hints->axis[dim];
682    FT_Memory     memory        = hints->memory;
683    FT_Error      error         = AF_Err_Ok;
684    AF_Segment    segment       = NULL;
685    AF_SegmentRec seg0;
686    AF_Point*     contour       = hints->contours;
687    AF_Point*     contour_limit = contour + hints->num_contours;
688    AF_Direction  major_dir, segment_dir;
689
690
691    FT_ZERO( &seg0 );
692    seg0.score = 32000;
693    seg0.flags = AF_EDGE_NORMAL;
694
695    major_dir   = (AF_Direction)FT_ABS( axis->major_dir );
696    segment_dir = major_dir;
697
698    axis->num_segments = 0;
699
700    /* set up (u,v) in each point */
701    if ( dim == AF_DIMENSION_HORZ )
702    {
703      AF_Point  point = hints->points;
704      AF_Point  limit = point + hints->num_points;
705
706
707      for ( ; point < limit; point++ )
708      {
709        point->u = point->fx;
710        point->v = point->fy;
711      }
712    }
713    else
714    {
715      AF_Point  point = hints->points;
716      AF_Point  limit = point + hints->num_points;
717
718
719      for ( ; point < limit; point++ )
720      {
721        point->u = point->fy;
722        point->v = point->fx;
723      }
724    }
725
726    /* do each contour separately */
727    for ( ; contour < contour_limit; contour++ )
728    {
729      AF_Point  point   =  contour[0];
730      AF_Point  start   =  point;
731      AF_Point  last    =  point->prev;
732
733
734      if ( point == last )  /* skip singletons -- just in case */
735        continue;
736
737      /* already on an edge ?, backtrack to find its start */
738      if ( FT_ABS( point->in_dir ) == major_dir )
739      {
740        point = point->prev;
741
742        while ( point->in_dir == start->in_dir )
743          point = point->prev;
744      }
745      else  /* otherwise, find first segment start, if any */
746      {
747        while ( FT_ABS( point->out_dir ) != major_dir )
748        {
749          point = point->next;
750
751          if ( point == start )
752            goto NextContour;
753        }
754      }
755
756      start = point;
757
758      for  (;;)
759      {
760        AF_Point  first;
761        FT_Pos    min_u, min_v, max_u, max_v;
762
763        /* we're at the start of a new segment */
764        FT_ASSERT( FT_ABS( point->out_dir ) == major_dir &&
765                           point->in_dir != point->out_dir );
766        first = point;
767
768        min_u = max_u = point->u;
769        min_v = max_v = point->v;
770
771        point = point->next;
772
773        while ( point->out_dir == first->out_dir )
774        {
775          point = point->next;
776
777          if ( point->u < min_u )
778            min_u = point->u;
779
780          if ( point->u > max_u )
781            max_u = point->u;
782        }
783
784        if ( point->v < min_v )
785          min_v = point->v;
786
787        if ( point->v > max_v )
788          max_v = point->v;
789
790        /* record new segment */
791        error = af_axis_hints_new_segment( axis, memory, &segment );
792        if ( error )
793          goto Exit;
794
795        segment[0]         = seg0;
796        segment->dir       = first->out_dir;
797        segment->first     = first;
798        segment->last      = point;
799        segment->pos       = (FT_Short)(( min_u + max_u ) >> 1);
800        segment->min_coord = (FT_Short) min_v;
801        segment->max_coord = (FT_Short) max_v;
802        segment->height    = (FT_Short)(max_v - min_v);
803
804        /* a segment is round if it doesn't have successive */
805        /* on-curve points.                                 */
806        {
807          AF_Point  pt   = first;
808          AF_Point  last = point;
809          AF_Flags  f0   = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
810          AF_Flags  f1;
811
812
813          segment->flags &= ~AF_EDGE_ROUND;
814
815          for ( ; pt != last; f0 = f1 )
816          {
817            pt = pt->next;
818            f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
819
820            if ( !f0 && !f1 )
821              break;
822
823            if ( pt == last )
824              segment->flags |= AF_EDGE_ROUND;
825          }
826        }
827
828       /* this can happen in the case of a degenerate contour
829        * e.g. a 2-point vertical contour
830        */
831        if ( point == start )
832          break;
833
834        /* jump to the start of the next segment, if any */
835        while ( FT_ABS(point->out_dir) != major_dir )
836        {
837          point = point->next;
838
839          if ( point == start )
840            goto NextContour;
841        }
842      }
843
844    NextContour:
845      ;
846    } /* contours */
847
848    /* now slightly increase the height of segments when this makes */
849    /* sense -- this is used to better detect and ignore serifs     */
850    {
851      AF_Segment  segments     = axis->segments;
852      AF_Segment  segments_end = segments + axis->num_segments;
853
854
855      for ( segment = segments; segment < segments_end; segment++ )
856      {
857        AF_Point  first   = segment->first;
858        AF_Point  last    = segment->last;
859        AF_Point  p;
860        FT_Pos    first_v = first->v;
861        FT_Pos    last_v  = last->v;
862
863
864        if ( first == last )
865          continue;
866
867        if ( first_v < last_v )
868        {
869          p = first->prev;
870          if ( p->v < first_v )
871            segment->height = (FT_Short)( segment->height +
872                                          ( ( first_v - p->v ) >> 1 ) );
873
874          p = last->next;
875          if ( p->v > last_v )
876            segment->height = (FT_Short)( segment->height +
877                                          ( ( p->v - last_v ) >> 1 ) );
878        }
879        else
880        {
881          p = first->prev;
882          if ( p->v > first_v )
883            segment->height = (FT_Short)( segment->height +
884                                          ( ( p->v - first_v ) >> 1 ) );
885
886          p = last->next;
887          if ( p->v < last_v )
888            segment->height = (FT_Short)( segment->height +
889                                          ( ( last_v - p->v ) >> 1 ) );
890        }
891      }
892    }
893
894#ifdef AF_SORT_SEGMENTS
895   /* place all segments with a negative direction to the start
896    * of the array, used to speed up segment linking later...
897    */
898    {
899      AF_Segment  segments = axis->segments;
900      FT_UInt     count    = axis->num_segments;
901      FT_UInt     ii, jj;
902
903      for (ii = 0; ii < count; ii++)
904      {
905        if ( segments[ii].dir > 0 )
906        {
907          for (jj = ii+1; jj < count; jj++)
908          {
909            if ( segments[jj].dir < 0 )
910            {
911              AF_SegmentRec  tmp;
912
913              tmp          = segments[ii];
914              segments[ii] = segments[jj];
915              segments[jj] = tmp;
916
917              break;
918            }
919          }
920
921          if ( jj == count )
922            break;
923        }
924      }
925      axis->mid_segments = ii;
926    }
927#endif
928
929  Exit:
930    return error;
931  }
932
933
934  FT_LOCAL_DEF( void )
935  af_latin2_hints_link_segments( AF_GlyphHints  hints,
936                                 AF_Dimension   dim )
937  {
938    AF_AxisHints  axis          = &hints->axis[dim];
939    AF_Segment    segments      = axis->segments;
940    AF_Segment    segment_limit = segments + axis->num_segments;
941#ifdef AF_SORT_SEGMENTS
942    AF_Segment    segment_mid   = segments + axis->mid_segments;
943#endif
944    FT_Pos        len_threshold, len_score;
945    AF_Segment    seg1, seg2;
946
947
948    len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
949    if ( len_threshold == 0 )
950      len_threshold = 1;
951
952    len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );
953
954#ifdef AF_SORT_SEGMENTS
955    for ( seg1 = segments; seg1 < segment_mid; seg1++ )
956    {
957      if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
958        continue;
959
960      for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ )
961#else
962    /* now compare each segment to the others */
963    for ( seg1 = segments; seg1 < segment_limit; seg1++ )
964    {
965      /* the fake segments are introduced to hint the metrics -- */
966      /* we must never link them to anything                     */
967      if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
968        continue;
969
970      for ( seg2 = segments; seg2 < segment_limit; seg2++ )
971        if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
972#endif
973        {
974          FT_Pos  pos1 = seg1->pos;
975          FT_Pos  pos2 = seg2->pos;
976          FT_Pos  dist = pos2 - pos1;
977
978
979          if ( dist < 0 )
980            continue;
981
982          {
983            FT_Pos  min = seg1->min_coord;
984            FT_Pos  max = seg1->max_coord;
985            FT_Pos  len, score;
986
987
988            if ( min < seg2->min_coord )
989              min = seg2->min_coord;
990
991            if ( max > seg2->max_coord )
992              max = seg2->max_coord;
993
994            len = max - min;
995            if ( len >= len_threshold )
996            {
997              score = dist + len_score / len;
998              if ( score < seg1->score )
999              {
1000                seg1->score = score;
1001                seg1->link  = seg2;
1002              }
1003
1004              if ( score < seg2->score )
1005              {
1006                seg2->score = score;
1007                seg2->link  = seg1;
1008              }
1009            }
1010          }
1011        }
1012    }
1013#if 0
1014    }
1015#endif
1016
1017    /* now, compute the `serif' segments */
1018    for ( seg1 = segments; seg1 < segment_limit; seg1++ )
1019    {
1020      seg2 = seg1->link;
1021
1022      if ( seg2 )
1023      {
1024        if ( seg2->link != seg1 )
1025        {
1026          seg1->link  = 0;
1027          seg1->serif = seg2->link;
1028        }
1029      }
1030    }
1031  }
1032
1033
1034  FT_LOCAL_DEF( FT_Error )
1035  af_latin2_hints_compute_edges( AF_GlyphHints  hints,
1036                                 AF_Dimension   dim )
1037  {
1038    AF_AxisHints  axis   = &hints->axis[dim];
1039    FT_Error      error  = AF_Err_Ok;
1040    FT_Memory     memory = hints->memory;
1041    AF_LatinAxis  laxis  = &((AF_LatinMetrics)hints->metrics)->axis[dim];
1042
1043    AF_Segment    segments      = axis->segments;
1044    AF_Segment    segment_limit = segments + axis->num_segments;
1045    AF_Segment    seg;
1046
1047    AF_Direction  up_dir;
1048    FT_Fixed      scale;
1049    FT_Pos        edge_distance_threshold;
1050    FT_Pos        segment_length_threshold;
1051
1052
1053    axis->num_edges = 0;
1054
1055    scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
1056                                         : hints->y_scale;
1057
1058    up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
1059                                          : AF_DIR_RIGHT;
1060
1061    /*
1062     *  We want to ignore very small (mostly serif) segments, we do that
1063     *  by ignoring those that whose length is less than a given fraction
1064     *  of the standard width. If there is no standard width, we ignore
1065     *  those that are less than a given size in pixels
1066     *
1067     *  also, unlink serif segments that are linked to segments farther
1068     *  than 50% of the standard width
1069     */
1070    if ( dim == AF_DIMENSION_HORZ )
1071    {
1072      if ( laxis->width_count > 0 )
1073        segment_length_threshold = (laxis->standard_width * 10 ) >> 4;
1074      else
1075        segment_length_threshold = FT_DivFix( 64, hints->y_scale );
1076    }
1077    else
1078      segment_length_threshold = 0;
1079
1080    /*********************************************************************/
1081    /*                                                                   */
1082    /* We will begin by generating a sorted table of edges for the       */
1083    /* current direction.  To do so, we simply scan each segment and try */
1084    /* to find an edge in our table that corresponds to its position.    */
1085    /*                                                                   */
1086    /* If no edge is found, we create and insert a new edge in the       */
1087    /* sorted table.  Otherwise, we simply add the segment to the edge's */
1088    /* list which will be processed in the second step to compute the    */
1089    /* edge's properties.                                                */
1090    /*                                                                   */
1091    /* Note that the edges table is sorted along the segment/edge        */
1092    /* position.                                                         */
1093    /*                                                                   */
1094    /*********************************************************************/
1095
1096    edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
1097                                         scale );
1098    if ( edge_distance_threshold > 64 / 4 )
1099      edge_distance_threshold = 64 / 4;
1100
1101    edge_distance_threshold = FT_DivFix( edge_distance_threshold,
1102                                         scale );
1103
1104    for ( seg = segments; seg < segment_limit; seg++ )
1105    {
1106      AF_Edge  found = 0;
1107      FT_Int   ee;
1108
1109
1110      if ( seg->height < segment_length_threshold )
1111        continue;
1112
1113      /* A special case for serif edges: If they are smaller than */
1114      /* 1.5 pixels we ignore them.                               */
1115      if ( seg->serif )
1116      {
1117        FT_Pos  dist = seg->serif->pos - seg->pos;
1118
1119        if (dist < 0)
1120          dist = -dist;
1121
1122        if (dist >= laxis->standard_width >> 1)
1123        {
1124          /* unlink this serif, it is too distant from its reference stem */
1125          seg->serif = NULL;
1126        }
1127        else if ( 2*seg->height < 3 * segment_length_threshold )
1128          continue;
1129      }
1130
1131      /* look for an edge corresponding to the segment */
1132      for ( ee = 0; ee < axis->num_edges; ee++ )
1133      {
1134        AF_Edge  edge = axis->edges + ee;
1135        FT_Pos   dist;
1136
1137
1138        dist = seg->pos - edge->fpos;
1139        if ( dist < 0 )
1140          dist = -dist;
1141
1142        if ( dist < edge_distance_threshold && edge->dir == seg->dir )
1143        {
1144          found = edge;
1145          break;
1146        }
1147      }
1148
1149      if ( !found )
1150      {
1151        AF_Edge   edge;
1152
1153
1154        /* insert a new edge in the list and */
1155        /* sort according to the position    */
1156        error = af_axis_hints_new_edge( axis, seg->pos, seg->dir,
1157                                        memory, &edge );
1158        if ( error )
1159          goto Exit;
1160
1161        /* add the segment to the new edge's list */
1162        FT_ZERO( edge );
1163
1164        edge->first    = seg;
1165        edge->last     = seg;
1166        edge->fpos     = seg->pos;
1167        edge->dir      = seg->dir;
1168        edge->opos     = edge->pos = FT_MulFix( seg->pos, scale );
1169        seg->edge_next = seg;
1170      }
1171      else
1172      {
1173        /* if an edge was found, simply add the segment to the edge's */
1174        /* list                                                       */
1175        seg->edge_next         = found->first;
1176        found->last->edge_next = seg;
1177        found->last            = seg;
1178      }
1179    }
1180
1181
1182    /*********************************************************************/
1183    /*                                                                   */
1184    /* Good, we will now compute each edge's properties according to     */
1185    /* segments found on its position.  Basically, these are:            */
1186    /*                                                                   */
1187    /*  - edge's main direction                                          */
1188    /*  - stem edge, serif edge or both (which defaults to stem then)    */
1189    /*  - rounded edge, straight or both (which defaults to straight)    */
1190    /*  - link for edge                                                  */
1191    /*                                                                   */
1192    /*********************************************************************/
1193
1194    /* first of all, set the `edge' field in each segment -- this is */
1195    /* required in order to compute edge links                       */
1196
1197    /*
1198     * Note that removing this loop and setting the `edge' field of each
1199     * segment directly in the code above slows down execution speed for
1200     * some reasons on platforms like the Sun.
1201     */
1202    {
1203      AF_Edge  edges      = axis->edges;
1204      AF_Edge  edge_limit = edges + axis->num_edges;
1205      AF_Edge  edge;
1206
1207
1208      for ( edge = edges; edge < edge_limit; edge++ )
1209      {
1210        seg = edge->first;
1211        if ( seg )
1212          do
1213          {
1214            seg->edge = edge;
1215            seg       = seg->edge_next;
1216
1217          } while ( seg != edge->first );
1218      }
1219
1220      /* now, compute each edge properties */
1221      for ( edge = edges; edge < edge_limit; edge++ )
1222      {
1223        FT_Int  is_round    = 0;  /* does it contain round segments?    */
1224        FT_Int  is_straight = 0;  /* does it contain straight segments? */
1225#if 0
1226        FT_Pos  ups         = 0;  /* number of upwards segments         */
1227        FT_Pos  downs       = 0;  /* number of downwards segments       */
1228#endif
1229
1230
1231        seg = edge->first;
1232
1233        do
1234        {
1235          FT_Bool  is_serif;
1236
1237
1238          /* check for roundness of segment */
1239          if ( seg->flags & AF_EDGE_ROUND )
1240            is_round++;
1241          else
1242            is_straight++;
1243
1244#if 0
1245          /* check for segment direction */
1246          if ( seg->dir == up_dir )
1247            ups   += seg->max_coord-seg->min_coord;
1248          else
1249            downs += seg->max_coord-seg->min_coord;
1250#endif
1251
1252          /* check for links -- if seg->serif is set, then seg->link must */
1253          /* be ignored                                                   */
1254          is_serif = (FT_Bool)( seg->serif               &&
1255                                seg->serif->edge         &&
1256                                seg->serif->edge != edge );
1257
1258          if ( ( seg->link && seg->link->edge != NULL ) || is_serif )
1259          {
1260            AF_Edge     edge2;
1261            AF_Segment  seg2;
1262
1263
1264            edge2 = edge->link;
1265            seg2  = seg->link;
1266
1267            if ( is_serif )
1268            {
1269              seg2  = seg->serif;
1270              edge2 = edge->serif;
1271            }
1272
1273            if ( edge2 )
1274            {
1275              FT_Pos  edge_delta;
1276              FT_Pos  seg_delta;
1277
1278
1279              edge_delta = edge->fpos - edge2->fpos;
1280              if ( edge_delta < 0 )
1281                edge_delta = -edge_delta;
1282
1283              seg_delta = seg->pos - seg2->pos;
1284              if ( seg_delta < 0 )
1285                seg_delta = -seg_delta;
1286
1287              if ( seg_delta < edge_delta )
1288                edge2 = seg2->edge;
1289            }
1290            else
1291              edge2 = seg2->edge;
1292
1293            if ( is_serif )
1294            {
1295              edge->serif   = edge2;
1296              edge2->flags |= AF_EDGE_SERIF;
1297            }
1298            else
1299              edge->link  = edge2;
1300          }
1301
1302          seg = seg->edge_next;
1303
1304        } while ( seg != edge->first );
1305
1306        /* set the round/straight flags */
1307        edge->flags = AF_EDGE_NORMAL;
1308
1309        if ( is_round > 0 && is_round >= is_straight )
1310          edge->flags |= AF_EDGE_ROUND;
1311
1312#if 0
1313        /* set the edge's main direction */
1314        edge->dir = AF_DIR_NONE;
1315
1316        if ( ups > downs )
1317          edge->dir = (FT_Char)up_dir;
1318
1319        else if ( ups < downs )
1320          edge->dir = (FT_Char)-up_dir;
1321
1322        else if ( ups == downs )
1323          edge->dir = 0;  /* both up and down! */
1324#endif
1325
1326        /* gets rid of serifs if link is set                */
1327        /* XXX: This gets rid of many unpleasant artefacts! */
1328        /*      Example: the `c' in cour.pfa at size 13     */
1329
1330        if ( edge->serif && edge->link )
1331          edge->serif = 0;
1332      }
1333    }
1334
1335  Exit:
1336    return error;
1337  }
1338
1339
1340  FT_LOCAL_DEF( FT_Error )
1341  af_latin2_hints_detect_features( AF_GlyphHints  hints,
1342                                   AF_Dimension   dim )
1343  {
1344    FT_Error  error;
1345
1346
1347    error = af_latin2_hints_compute_segments( hints, dim );
1348    if ( !error )
1349    {
1350      af_latin2_hints_link_segments( hints, dim );
1351
1352      error = af_latin2_hints_compute_edges( hints, dim );
1353    }
1354    return error;
1355  }
1356
1357
1358  FT_LOCAL_DEF( void )
1359  af_latin2_hints_compute_blue_edges( AF_GlyphHints    hints,
1360                                      AF_LatinMetrics  metrics )
1361  {
1362    AF_AxisHints  axis       = &hints->axis[AF_DIMENSION_VERT];
1363    AF_Edge       edge       = axis->edges;
1364    AF_Edge       edge_limit = edge + axis->num_edges;
1365    AF_LatinAxis  latin      = &metrics->axis[AF_DIMENSION_VERT];
1366    FT_Fixed      scale      = latin->scale;
1367    FT_Pos        best_dist0;  /* initial threshold */
1368
1369
1370    /* compute the initial threshold as a fraction of the EM size */
1371    best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
1372
1373    if ( best_dist0 > 64 / 2 )
1374      best_dist0 = 64 / 2;
1375
1376    /* compute which blue zones are active, i.e. have their scaled */
1377    /* size < 3/4 pixels                                           */
1378
1379    /* for each horizontal edge search the blue zone which is closest */
1380    for ( ; edge < edge_limit; edge++ )
1381    {
1382      FT_Int    bb;
1383      AF_Width  best_blue = NULL;
1384      FT_Pos    best_dist = best_dist0;
1385
1386      for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
1387      {
1388        AF_LatinBlue  blue = latin->blues + bb;
1389        FT_Bool       is_top_blue, is_major_dir;
1390
1391
1392        /* skip inactive blue zones (i.e., those that are too small) */
1393        if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )
1394          continue;
1395
1396        /* if it is a top zone, check for right edges -- if it is a bottom */
1397        /* zone, check for left edges                                      */
1398        /*                                                                 */
1399        /* of course, that's for TrueType                                  */
1400        is_top_blue  = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );
1401        is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
1402
1403        /* if it is a top zone, the edge must be against the major    */
1404        /* direction; if it is a bottom zone, it must be in the major */
1405        /* direction                                                  */
1406        if ( is_top_blue ^ is_major_dir )
1407        {
1408          FT_Pos     dist;
1409          AF_Width   compare;
1410
1411
1412          /* if it's a rounded edge, compare it to the overshoot position */
1413          /* if it's a flat edge, compare it to the reference position    */
1414          if ( edge->flags & AF_EDGE_ROUND )
1415            compare = &blue->shoot;
1416          else
1417            compare = &blue->ref;
1418
1419          dist = edge->fpos - compare->org;
1420          if (dist < 0)
1421            dist = -dist;
1422
1423          dist = FT_MulFix( dist, scale );
1424          if ( dist < best_dist )
1425          {
1426            best_dist = dist;
1427            best_blue = compare;
1428          }
1429
1430#if 0
1431          /* now, compare it to the overshoot position if the edge is     */
1432          /* rounded, and if the edge is over the reference position of a */
1433          /* top zone, or under the reference position of a bottom zone   */
1434          if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
1435          {
1436            FT_Bool  is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );
1437
1438
1439            if ( is_top_blue ^ is_under_ref )
1440            {
1441              blue = latin->blues + bb;
1442              dist = edge->fpos - blue->shoot.org;
1443              if ( dist < 0 )
1444                dist = -dist;
1445
1446              dist = FT_MulFix( dist, scale );
1447              if ( dist < best_dist )
1448              {
1449                best_dist = dist;
1450                best_blue = & blue->shoot;
1451              }
1452            }
1453          }
1454#endif
1455        }
1456      }
1457
1458      if ( best_blue )
1459        edge->blue_edge = best_blue;
1460    }
1461  }
1462
1463
1464  static FT_Error
1465  af_latin2_hints_init( AF_GlyphHints    hints,
1466                        AF_LatinMetrics  metrics )
1467  {
1468    FT_Render_Mode  mode;
1469    FT_UInt32       scaler_flags, other_flags;
1470    FT_Face         face = metrics->root.scaler.face;
1471
1472
1473    af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
1474
1475    /*
1476     *  correct x_scale and y_scale if needed, since they may have
1477     *  been modified `af_latin2_metrics_scale_dim' above
1478     */
1479    hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
1480    hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
1481    hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
1482    hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
1483
1484    /* compute flags depending on render mode, etc. */
1485    mode = metrics->root.scaler.render_mode;
1486
1487#if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */
1488    if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
1489    {
1490      metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
1491    }
1492#endif
1493
1494    scaler_flags = hints->scaler_flags;
1495    other_flags  = 0;
1496
1497    /*
1498     *  We snap the width of vertical stems for the monochrome and
1499     *  horizontal LCD rendering targets only.
1500     */
1501    if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
1502      other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
1503
1504    /*
1505     *  We snap the width of horizontal stems for the monochrome and
1506     *  vertical LCD rendering targets only.
1507     */
1508    if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
1509      other_flags |= AF_LATIN_HINTS_VERT_SNAP;
1510
1511    /*
1512     *  We adjust stems to full pixels only if we don't use the `light' mode.
1513     */
1514    if ( mode != FT_RENDER_MODE_LIGHT )
1515      other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
1516
1517    if ( mode == FT_RENDER_MODE_MONO )
1518      other_flags |= AF_LATIN_HINTS_MONO;
1519
1520    /*
1521     *  In `light' hinting mode we disable horizontal hinting completely.
1522     *  We also do it if the face is italic.
1523     */
1524    if ( mode == FT_RENDER_MODE_LIGHT                    ||
1525         (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 )
1526      scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
1527
1528    hints->scaler_flags = scaler_flags;
1529    hints->other_flags  = other_flags;
1530
1531    return 0;
1532  }
1533
1534
1535  /*************************************************************************/
1536  /*************************************************************************/
1537  /*****                                                               *****/
1538  /*****        L A T I N   G L Y P H   G R I D - F I T T I N G        *****/
1539  /*****                                                               *****/
1540  /*************************************************************************/
1541  /*************************************************************************/
1542
1543  /* snap a given width in scaled coordinates to one of the */
1544  /* current standard widths                                */
1545
1546  static FT_Pos
1547  af_latin2_snap_width( AF_Width  widths,
1548                        FT_Int    count,
1549                        FT_Pos    width )
1550  {
1551    int     n;
1552    FT_Pos  best      = 64 + 32 + 2;
1553    FT_Pos  reference = width;
1554    FT_Pos  scaled;
1555
1556
1557    for ( n = 0; n < count; n++ )
1558    {
1559      FT_Pos  w;
1560      FT_Pos  dist;
1561
1562
1563      w = widths[n].cur;
1564      dist = width - w;
1565      if ( dist < 0 )
1566        dist = -dist;
1567      if ( dist < best )
1568      {
1569        best      = dist;
1570        reference = w;
1571      }
1572    }
1573
1574    scaled = FT_PIX_ROUND( reference );
1575
1576    if ( width >= reference )
1577    {
1578      if ( width < scaled + 48 )
1579        width = reference;
1580    }
1581    else
1582    {
1583      if ( width > scaled - 48 )
1584        width = reference;
1585    }
1586
1587    return width;
1588  }
1589
1590
1591  /* compute the snapped width of a given stem */
1592
1593  static FT_Pos
1594  af_latin2_compute_stem_width( AF_GlyphHints  hints,
1595                                AF_Dimension   dim,
1596                                FT_Pos         width,
1597                                AF_Edge_Flags  base_flags,
1598                                AF_Edge_Flags  stem_flags )
1599  {
1600    AF_LatinMetrics  metrics  = (AF_LatinMetrics) hints->metrics;
1601    AF_LatinAxis     axis     = & metrics->axis[dim];
1602    FT_Pos           dist     = width;
1603    FT_Int           sign     = 0;
1604    FT_Int           vertical = ( dim == AF_DIMENSION_VERT );
1605
1606
1607    FT_UNUSED(base_flags);
1608
1609    if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
1610          axis->extra_light                      )
1611      return width;
1612
1613    if ( dist < 0 )
1614    {
1615      dist = -width;
1616      sign = 1;
1617    }
1618
1619    if ( (  vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
1620         ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
1621    {
1622      /* smooth hinting process: very lightly quantize the stem width */
1623
1624      /* leave the widths of serifs alone */
1625
1626      if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )
1627        goto Done_Width;
1628
1629#if 0
1630      else if ( ( base_flags & AF_EDGE_ROUND ) )
1631      {
1632        if ( dist < 80 )
1633          dist = 64;
1634      }
1635      else if ( dist < 56 )
1636        dist = 56;
1637#endif
1638      if ( axis->width_count > 0 )
1639      {
1640        FT_Pos  delta;
1641
1642
1643        /* compare to standard width */
1644        if ( axis->width_count > 0 )
1645        {
1646          delta = dist - axis->widths[0].cur;
1647
1648          if ( delta < 0 )
1649            delta = -delta;
1650
1651          if ( delta < 40 )
1652          {
1653            dist = axis->widths[0].cur;
1654            if ( dist < 48 )
1655              dist = 48;
1656
1657            goto Done_Width;
1658          }
1659        }
1660
1661        if ( dist < 3 * 64 )
1662        {
1663          delta  = dist & 63;
1664          dist  &= -64;
1665
1666          if ( delta < 10 )
1667            dist += delta;
1668
1669          else if ( delta < 32 )
1670            dist += 10;
1671
1672          else if ( delta < 54 )
1673            dist += 54;
1674
1675          else
1676            dist += delta;
1677        }
1678        else
1679          dist = ( dist + 32 ) & ~63;
1680      }
1681    }
1682    else
1683    {
1684      /* strong hinting process: snap the stem width to integer pixels */
1685      FT_Pos  org_dist = dist;
1686
1687
1688      dist = af_latin2_snap_width( axis->widths, axis->width_count, dist );
1689
1690      if ( vertical )
1691      {
1692        /* in the case of vertical hinting, always round */
1693        /* the stem heights to integer pixels            */
1694
1695        if ( dist >= 64 )
1696          dist = ( dist + 16 ) & ~63;
1697        else
1698          dist = 64;
1699      }
1700      else
1701      {
1702        if ( AF_LATIN_HINTS_DO_MONO( hints ) )
1703        {
1704          /* monochrome horizontal hinting: snap widths to integer pixels */
1705          /* with a different threshold                                   */
1706
1707          if ( dist < 64 )
1708            dist = 64;
1709          else
1710            dist = ( dist + 32 ) & ~63;
1711        }
1712        else
1713        {
1714          /* for horizontal anti-aliased hinting, we adopt a more subtle */
1715          /* approach: we strengthen small stems, round stems whose size */
1716          /* is between 1 and 2 pixels to an integer, otherwise nothing  */
1717
1718          if ( dist < 48 )
1719            dist = ( dist + 64 ) >> 1;
1720
1721          else if ( dist < 128 )
1722          {
1723            /* We only round to an integer width if the corresponding */
1724            /* distortion is less than 1/4 pixel.  Otherwise this     */
1725            /* makes everything worse since the diagonals, which are  */
1726            /* not hinted, appear a lot bolder or thinner than the    */
1727            /* vertical stems.                                        */
1728
1729            FT_Int  delta;
1730
1731
1732            dist = ( dist + 22 ) & ~63;
1733            delta = dist - org_dist;
1734            if ( delta < 0 )
1735              delta = -delta;
1736
1737            if (delta >= 16)
1738            {
1739              dist = org_dist;
1740              if ( dist < 48 )
1741                dist = ( dist + 64 ) >> 1;
1742            }
1743          }
1744          else
1745            /* round otherwise to prevent color fringes in LCD mode */
1746            dist = ( dist + 32 ) & ~63;
1747        }
1748      }
1749    }
1750
1751  Done_Width:
1752    if ( sign )
1753      dist = -dist;
1754
1755    return dist;
1756  }
1757
1758
1759  /* align one stem edge relative to the previous stem edge */
1760
1761  static void
1762  af_latin2_align_linked_edge( AF_GlyphHints  hints,
1763                               AF_Dimension   dim,
1764                               AF_Edge        base_edge,
1765                               AF_Edge        stem_edge )
1766  {
1767    FT_Pos  dist = stem_edge->opos - base_edge->opos;
1768
1769    FT_Pos  fitted_width = af_latin2_compute_stem_width(
1770                             hints, dim, dist,
1771                             (AF_Edge_Flags)base_edge->flags,
1772                             (AF_Edge_Flags)stem_edge->flags );
1773
1774
1775    stem_edge->pos = base_edge->pos + fitted_width;
1776
1777    FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "
1778                "dist was %.2f, now %.2f\n",
1779                stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0,
1780                stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));
1781  }
1782
1783
1784  static void
1785  af_latin2_align_serif_edge( AF_GlyphHints  hints,
1786                              AF_Edge        base,
1787                              AF_Edge        serif )
1788  {
1789    FT_UNUSED( hints );
1790
1791    serif->pos = base->pos + (serif->opos - base->opos);
1792  }
1793
1794
1795  /*************************************************************************/
1796  /*************************************************************************/
1797  /*************************************************************************/
1798  /****                                                                 ****/
1799  /****                    E D G E   H I N T I N G                      ****/
1800  /****                                                                 ****/
1801  /*************************************************************************/
1802  /*************************************************************************/
1803  /*************************************************************************/
1804
1805
1806  FT_LOCAL_DEF( void )
1807  af_latin2_hint_edges( AF_GlyphHints  hints,
1808                        AF_Dimension   dim )
1809  {
1810    AF_AxisHints  axis       = &hints->axis[dim];
1811    AF_Edge       edges      = axis->edges;
1812    AF_Edge       edge_limit = edges + axis->num_edges;
1813    AF_Edge       edge;
1814    AF_Edge       anchor     = 0;
1815    FT_Int        has_serifs = 0;
1816    FT_Pos        anchor_drift = 0;
1817
1818
1819
1820    FT_TRACE5(( "==== hinting %s edges =====\n",
1821                dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));
1822
1823    /* we begin by aligning all stems relative to the blue zone */
1824    /* if needed -- that's only for horizontal edges            */
1825
1826    if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) )
1827    {
1828      for ( edge = edges; edge < edge_limit; edge++ )
1829      {
1830        AF_Width  blue;
1831        AF_Edge   edge1, edge2;
1832
1833
1834        if ( edge->flags & AF_EDGE_DONE )
1835          continue;
1836
1837        blue  = edge->blue_edge;
1838        edge1 = NULL;
1839        edge2 = edge->link;
1840
1841        if ( blue )
1842        {
1843          edge1 = edge;
1844        }
1845        else if ( edge2 && edge2->blue_edge )
1846        {
1847          blue  = edge2->blue_edge;
1848          edge1 = edge2;
1849          edge2 = edge;
1850        }
1851
1852        if ( !edge1 )
1853          continue;
1854
1855        FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "
1856                    "was (%.2f)\n",
1857                    edge1-edges, edge1->opos / 64.0, blue->fit / 64.0,
1858                    edge1->pos / 64.0 ));
1859
1860        edge1->pos    = blue->fit;
1861        edge1->flags |= AF_EDGE_DONE;
1862
1863        if ( edge2 && !edge2->blue_edge )
1864        {
1865          af_latin2_align_linked_edge( hints, dim, edge1, edge2 );
1866          edge2->flags |= AF_EDGE_DONE;
1867        }
1868
1869        if ( !anchor )
1870        {
1871          anchor = edge;
1872
1873          anchor_drift = (anchor->pos - anchor->opos);
1874          if (edge2)
1875            anchor_drift = (anchor_drift + (edge2->pos - edge2->opos)) >> 1;
1876        }
1877      }
1878    }
1879
1880    /* now we will align all stem edges, trying to maintain the */
1881    /* relative order of stems in the glyph                     */
1882    for ( edge = edges; edge < edge_limit; edge++ )
1883    {
1884      AF_Edge  edge2;
1885
1886
1887      if ( edge->flags & AF_EDGE_DONE )
1888        continue;
1889
1890      /* skip all non-stem edges */
1891      edge2 = edge->link;
1892      if ( !edge2 )
1893      {
1894        has_serifs++;
1895        continue;
1896      }
1897
1898      /* now align the stem */
1899
1900      /* this should not happen, but it's better to be safe */
1901      if ( edge2->blue_edge )
1902      {
1903        FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
1904
1905        af_latin2_align_linked_edge( hints, dim, edge2, edge );
1906        edge->flags |= AF_EDGE_DONE;
1907        continue;
1908      }
1909
1910      if ( !anchor )
1911      {
1912        FT_Pos  org_len, org_center, cur_len;
1913        FT_Pos  cur_pos1, error1, error2, u_off, d_off;
1914
1915
1916        org_len = edge2->opos - edge->opos;
1917        cur_len = af_latin2_compute_stem_width(
1918                    hints, dim, org_len,
1919                    (AF_Edge_Flags)edge->flags,
1920                    (AF_Edge_Flags)edge2->flags );
1921        if ( cur_len <= 64 )
1922          u_off = d_off = 32;
1923        else
1924        {
1925          u_off = 38;
1926          d_off = 26;
1927        }
1928
1929        if ( cur_len < 96 )
1930        {
1931          org_center = edge->opos + ( org_len >> 1 );
1932
1933          cur_pos1   = FT_PIX_ROUND( org_center );
1934
1935          error1 = org_center - ( cur_pos1 - u_off );
1936          if ( error1 < 0 )
1937            error1 = -error1;
1938
1939          error2 = org_center - ( cur_pos1 + d_off );
1940          if ( error2 < 0 )
1941            error2 = -error2;
1942
1943          if ( error1 < error2 )
1944            cur_pos1 -= u_off;
1945          else
1946            cur_pos1 += d_off;
1947
1948          edge->pos  = cur_pos1 - cur_len / 2;
1949          edge2->pos = edge->pos + cur_len;
1950        }
1951        else
1952          edge->pos = FT_PIX_ROUND( edge->opos );
1953
1954        FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)"
1955                    " snapped to (%.2f) (%.2f)\n",
1956                    edge-edges, edge->opos / 64.0,
1957                    edge2-edges, edge2->opos / 64.0,
1958                    edge->pos / 64.0, edge2->pos / 64.0 ));
1959        anchor = edge;
1960
1961        edge->flags |= AF_EDGE_DONE;
1962
1963        af_latin2_align_linked_edge( hints, dim, edge, edge2 );
1964
1965        edge2->flags |= AF_EDGE_DONE;
1966
1967        anchor_drift = ( (anchor->pos - anchor->opos) +
1968                         (edge2->pos - edge2->opos)) >> 1;
1969
1970        FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 ));
1971      }
1972      else
1973      {
1974        FT_Pos   org_pos, org_len, org_center, cur_center, cur_len;
1975        FT_Pos   org_left, org_right;
1976
1977
1978        org_pos    = edge->opos + anchor_drift;
1979        org_len    = edge2->opos - edge->opos;
1980        org_center = org_pos + ( org_len >> 1 );
1981
1982        cur_len = af_latin2_compute_stem_width(
1983                   hints, dim, org_len,
1984                   (AF_Edge_Flags)edge->flags,
1985                   (AF_Edge_Flags)edge2->flags );
1986
1987        org_left  = org_pos + ((org_len - cur_len) >> 1);
1988        org_right = org_pos + ((org_len + cur_len) >> 1);
1989
1990        FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ",
1991                    org_left / 64.0, org_right / 64.0 ));
1992        cur_center = org_center;
1993
1994        if ( edge2->flags & AF_EDGE_DONE )
1995        {
1996          FT_TRACE5(( "\n" ));
1997          edge->pos = edge2->pos - cur_len;
1998        }
1999        else
2000        {
2001         /* we want to compare several displacement, and choose
2002          * the one that increases fitness while minimizing
2003          * distortion as well
2004          */
2005          FT_Pos   displacements[6], scores[6], org, fit, delta;
2006          FT_UInt  count = 0;
2007
2008          /* note: don't even try to fit tiny stems */
2009          if ( cur_len < 32 )
2010          {
2011            FT_TRACE5(( "tiny stem\n" ));
2012            goto AlignStem;
2013          }
2014
2015          /* if the span is within a single pixel, don't touch it */
2016          if ( FT_PIX_FLOOR(org_left) == FT_PIX_CEIL(org_right) )
2017          {
2018            FT_TRACE5(( "single pixel stem\n" ));
2019            goto AlignStem;
2020          }
2021
2022          if (cur_len <= 96)
2023          {
2024           /* we want to avoid the absolute worst case which is
2025            * when the left and right edges of the span each represent
2026            * about 50% of the gray. we'd better want to change this
2027            * to 25/75%, since this is much more pleasant to the eye with
2028            * very acceptable distortion
2029            */
2030            FT_Pos  frac_left  = (org_left) & 63;
2031            FT_Pos  frac_right = (org_right) & 63;
2032
2033            if ( frac_left  >= 22 && frac_left  <= 42 &&
2034                 frac_right >= 22 && frac_right <= 42 )
2035            {
2036              org = frac_left;
2037              fit = (org <= 32) ? 16 : 48;
2038              delta = FT_ABS(fit - org);
2039              displacements[count] = fit - org;
2040              scores[count++]      = delta;
2041              FT_TRACE5(( "dispA=%.2f (%d) ", (fit - org) / 64.0, delta ));
2042
2043              org = frac_right;
2044              fit = (org <= 32) ? 16 : 48;
2045              delta = FT_ABS(fit - org);
2046              displacements[count] = fit - org;
2047              scores[count++]     = delta;
2048              FT_TRACE5(( "dispB=%.2f (%d) ", (fit - org) / 64.0, delta ));
2049            }
2050          }
2051
2052          /* snapping the left edge to the grid */
2053          org   = org_left;
2054          fit   = FT_PIX_ROUND(org);
2055          delta = FT_ABS(fit - org);
2056          displacements[count] = fit - org;
2057          scores[count++]      = delta;
2058          FT_TRACE5(( "dispC=%.2f (%d) ", (fit - org) / 64.0, delta ));
2059
2060          /* snapping the right edge to the grid */
2061          org   = org_right;
2062          fit   = FT_PIX_ROUND(org);
2063          delta = FT_ABS(fit - org);
2064          displacements[count] = fit - org;
2065          scores[count++]      = delta;
2066          FT_TRACE5(( "dispD=%.2f (%d) ", (fit - org) / 64.0, delta ));
2067
2068          /* now find the best displacement */
2069          {
2070            FT_Pos  best_score = scores[0];
2071            FT_Pos  best_disp  = displacements[0];
2072            FT_UInt nn;
2073
2074            for (nn = 1; nn < count; nn++)
2075            {
2076              if (scores[nn] < best_score)
2077              {
2078                best_score = scores[nn];
2079                best_disp  = displacements[nn];
2080              }
2081            }
2082
2083            cur_center = org_center + best_disp;
2084          }
2085          FT_TRACE5(( "\n" ));
2086        }
2087
2088      AlignStem:
2089        edge->pos  = cur_center - (cur_len >> 1);
2090        edge2->pos = edge->pos + cur_len;
2091
2092        FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)"
2093                    " snapped to (%.2f) and (%.2f),"
2094                    " org_len=%.2f cur_len=%.2f\n",
2095                    edge-edges, edge->opos / 64.0,
2096                    edge2-edges, edge2->opos / 64.0,
2097                    edge->pos / 64.0, edge2->pos / 64.0,
2098                    org_len / 64.0, cur_len / 64.0 ));
2099
2100        edge->flags  |= AF_EDGE_DONE;
2101        edge2->flags |= AF_EDGE_DONE;
2102
2103        if ( edge > edges && edge->pos < edge[-1].pos )
2104        {
2105          FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n",
2106                      edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));
2107          edge->pos = edge[-1].pos;
2108        }
2109      }
2110    }
2111
2112    /* make sure that lowercase m's maintain their symmetry */
2113
2114    /* In general, lowercase m's have six vertical edges if they are sans */
2115    /* serif, or twelve if they are with serifs.  This implementation is  */
2116    /* based on that assumption, and seems to work very well with most    */
2117    /* faces.  However, if for a certain face this assumption is not      */
2118    /* true, the m is just rendered like before.  In addition, any stem   */
2119    /* correction will only be applied to symmetrical glyphs (even if the */
2120    /* glyph is not an m), so the potential for unwanted distortion is    */
2121    /* relatively low.                                                    */
2122
2123    /* We don't handle horizontal edges since we can't easily assure that */
2124    /* the third (lowest) stem aligns with the base line; it might end up */
2125    /* one pixel higher or lower.                                         */
2126
2127#if 0
2128    {
2129      FT_Int  n_edges = edge_limit - edges;
2130
2131
2132      if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
2133      {
2134        AF_Edge  edge1, edge2, edge3;
2135        FT_Pos   dist1, dist2, span, delta;
2136
2137
2138        if ( n_edges == 6 )
2139        {
2140          edge1 = edges;
2141          edge2 = edges + 2;
2142          edge3 = edges + 4;
2143        }
2144        else
2145        {
2146          edge1 = edges + 1;
2147          edge2 = edges + 5;
2148          edge3 = edges + 9;
2149        }
2150
2151        dist1 = edge2->opos - edge1->opos;
2152        dist2 = edge3->opos - edge2->opos;
2153
2154        span = dist1 - dist2;
2155        if ( span < 0 )
2156          span = -span;
2157
2158        if ( span < 8 )
2159        {
2160          delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
2161          edge3->pos -= delta;
2162          if ( edge3->link )
2163            edge3->link->pos -= delta;
2164
2165          /* move the serifs along with the stem */
2166          if ( n_edges == 12 )
2167          {
2168            ( edges + 8 )->pos -= delta;
2169            ( edges + 11 )->pos -= delta;
2170          }
2171
2172          edge3->flags |= AF_EDGE_DONE;
2173          if ( edge3->link )
2174            edge3->link->flags |= AF_EDGE_DONE;
2175        }
2176      }
2177    }
2178#endif
2179
2180    if ( has_serifs || !anchor )
2181    {
2182      /*
2183       *  now hint the remaining edges (serifs and single) in order
2184       *  to complete our processing
2185       */
2186      for ( edge = edges; edge < edge_limit; edge++ )
2187      {
2188        FT_Pos  delta;
2189
2190
2191        if ( edge->flags & AF_EDGE_DONE )
2192          continue;
2193
2194        delta = 1000;
2195
2196        if ( edge->serif )
2197        {
2198          delta = edge->serif->opos - edge->opos;
2199          if ( delta < 0 )
2200            delta = -delta;
2201        }
2202
2203        if ( delta < 64 + 16 )
2204        {
2205          af_latin2_align_serif_edge( hints, edge->serif, edge );
2206          FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)"
2207                      " aligned to (%.2f)\n",
2208                      edge-edges, edge->opos / 64.0,
2209                      edge->serif - edges, edge->serif->opos / 64.0,
2210                      edge->pos / 64.0 ));
2211        }
2212        else if ( !anchor )
2213        {
2214          FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)"
2215                      " snapped to (%.2f)\n",
2216                      edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2217          edge->pos = FT_PIX_ROUND( edge->opos );
2218          anchor    = edge;
2219        }
2220        else
2221        {
2222          AF_Edge  before, after;
2223
2224
2225          for ( before = edge - 1; before >= edges; before-- )
2226            if ( before->flags & AF_EDGE_DONE )
2227              break;
2228
2229          for ( after = edge + 1; after < edge_limit; after++ )
2230            if ( after->flags & AF_EDGE_DONE )
2231              break;
2232
2233          if ( before >= edges && before < edge   &&
2234               after < edge_limit && after > edge )
2235          {
2236            if ( after->opos == before->opos )
2237              edge->pos = before->pos;
2238            else
2239              edge->pos = before->pos +
2240                          FT_MulDiv( edge->opos - before->opos,
2241                                     after->pos - before->pos,
2242                                     after->opos - before->opos );
2243            FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)"
2244                        " from %d (opos=%.2f)\n",
2245                        edge-edges, edge->opos / 64.0, edge->pos / 64.0,
2246                        before - edges, before->opos / 64.0 ));
2247          }
2248          else
2249          {
2250            edge->pos = anchor->pos +
2251                        ( ( edge->opos - anchor->opos + 16 ) & ~31 );
2252
2253            FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)"
2254                        " snapped to (%.2f)\n",
2255                        edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2256          }
2257        }
2258
2259        edge->flags |= AF_EDGE_DONE;
2260
2261        if ( edge > edges && edge->pos < edge[-1].pos )
2262          edge->pos = edge[-1].pos;
2263
2264        if ( edge + 1 < edge_limit        &&
2265             edge[1].flags & AF_EDGE_DONE &&
2266             edge->pos > edge[1].pos      )
2267          edge->pos = edge[1].pos;
2268      }
2269    }
2270  }
2271
2272
2273  static FT_Error
2274  af_latin2_hints_apply( AF_GlyphHints    hints,
2275                         FT_Outline*      outline,
2276                         AF_LatinMetrics  metrics )
2277  {
2278    FT_Error  error;
2279    int       dim;
2280
2281
2282    error = af_glyph_hints_reload( hints, outline );
2283    if ( error )
2284      goto Exit;
2285
2286    /* analyze glyph outline */
2287#ifdef AF_CONFIG_OPTION_USE_WARPER
2288    if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ||
2289         AF_HINTS_DO_HORIZONTAL( hints ) )
2290#else
2291    if ( AF_HINTS_DO_HORIZONTAL( hints ) )
2292#endif
2293    {
2294      error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ );
2295      if ( error )
2296        goto Exit;
2297    }
2298
2299    if ( AF_HINTS_DO_VERTICAL( hints ) )
2300    {
2301      error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT );
2302      if ( error )
2303        goto Exit;
2304
2305      af_latin2_hints_compute_blue_edges( hints, metrics );
2306    }
2307
2308    /* grid-fit the outline */
2309    for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
2310    {
2311#ifdef AF_CONFIG_OPTION_USE_WARPER
2312      if ( ( dim == AF_DIMENSION_HORZ &&
2313             metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) )
2314      {
2315        AF_WarperRec  warper;
2316        FT_Fixed      scale;
2317        FT_Pos        delta;
2318
2319
2320        af_warper_compute( &warper, hints, dim, &scale, &delta );
2321        af_glyph_hints_scale_dim( hints, dim, scale, delta );
2322        continue;
2323      }
2324#endif
2325
2326      if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
2327           ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) )   )
2328      {
2329        af_latin2_hint_edges( hints, (AF_Dimension)dim );
2330        af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim );
2331        af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
2332        af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
2333      }
2334    }
2335    af_glyph_hints_save( hints, outline );
2336
2337  Exit:
2338    return error;
2339  }
2340
2341
2342  /*************************************************************************/
2343  /*************************************************************************/
2344  /*****                                                               *****/
2345  /*****              L A T I N   S C R I P T   C L A S S              *****/
2346  /*****                                                               *****/
2347  /*************************************************************************/
2348  /*************************************************************************/
2349
2350
2351  static const AF_Script_UniRangeRec  af_latin2_uniranges[] =
2352  {
2353    AF_UNIRANGE_REC( 32UL,  127UL ),    /* TODO: Add new Unicode ranges here! */
2354    AF_UNIRANGE_REC( 160UL, 255UL ),
2355    AF_UNIRANGE_REC( 0UL,   0UL )
2356  };
2357
2358
2359  AF_DEFINE_SCRIPT_CLASS( af_latin2_script_class,
2360    AF_SCRIPT_LATIN2,
2361    af_latin2_uniranges,
2362
2363    sizeof ( AF_LatinMetricsRec ),
2364
2365    (AF_Script_InitMetricsFunc) af_latin2_metrics_init,
2366    (AF_Script_ScaleMetricsFunc)af_latin2_metrics_scale,
2367    (AF_Script_DoneMetricsFunc) NULL,
2368
2369    (AF_Script_InitHintsFunc)   af_latin2_hints_init,
2370    (AF_Script_ApplyHintsFunc)  af_latin2_hints_apply
2371  )
2372
2373
2374/* END */
2375