ReactOS  0.4.13-dev-464-g6b95727
ttgload.c
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1 /***************************************************************************/
2 /* */
3 /* ttgload.c */
4 /* */
5 /* TrueType Glyph Loader (body). */
6 /* */
7 /* Copyright 1996-2018 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 <ft2build.h>
20 #include FT_INTERNAL_DEBUG_H
21 #include FT_CONFIG_CONFIG_H
22 #include FT_INTERNAL_CALC_H
23 #include FT_INTERNAL_STREAM_H
24 #include FT_INTERNAL_SFNT_H
25 #include FT_TRUETYPE_TAGS_H
26 #include FT_OUTLINE_H
27 #include FT_DRIVER_H
28 #include FT_LIST_H
29 
30 #include "ttgload.h"
31 #include "ttpload.h"
32 
33 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
34 #include "ttgxvar.h"
35 #endif
36 
37 #include "tterrors.h"
38 #include "ttsubpix.h"
39 
40 
41  /*************************************************************************/
42  /* */
43  /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
44  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
45  /* messages during execution. */
46  /* */
47 #undef FT_COMPONENT
48 #define FT_COMPONENT trace_ttgload
49 
50 
51  /*************************************************************************/
52  /* */
53  /* Composite glyph flags. */
54  /* */
55 #define ARGS_ARE_WORDS 0x0001
56 #define ARGS_ARE_XY_VALUES 0x0002
57 #define ROUND_XY_TO_GRID 0x0004
58 #define WE_HAVE_A_SCALE 0x0008
59 /* reserved 0x0010 */
60 #define MORE_COMPONENTS 0x0020
61 #define WE_HAVE_AN_XY_SCALE 0x0040
62 #define WE_HAVE_A_2X2 0x0080
63 #define WE_HAVE_INSTR 0x0100
64 #define USE_MY_METRICS 0x0200
65 #define OVERLAP_COMPOUND 0x0400
66 #define SCALED_COMPONENT_OFFSET 0x0800
67 #define UNSCALED_COMPONENT_OFFSET 0x1000
68 
69 
70  /*************************************************************************/
71  /* */
72  /* Return the horizontal metrics in font units for a given glyph. */
73  /* */
74  FT_LOCAL_DEF( void )
75  TT_Get_HMetrics( TT_Face face,
76  FT_UInt idx,
77  FT_Short* lsb,
78  FT_UShort* aw )
79  {
80  ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );
81 
82  FT_TRACE5(( " advance width (font units): %d\n", *aw ));
83  FT_TRACE5(( " left side bearing (font units): %d\n", *lsb ));
84  }
85 
86 
87  /*************************************************************************/
88  /* */
89  /* Return the vertical metrics in font units for a given glyph. */
90  /* See function `tt_loader_set_pp' below for explanations. */
91  /* */
92  FT_LOCAL_DEF( void )
93  TT_Get_VMetrics( TT_Face face,
94  FT_UInt idx,
95  FT_Pos yMax,
96  FT_Short* tsb,
97  FT_UShort* ah )
98  {
99  if ( face->vertical_info )
100  ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );
101 
102  else if ( face->os2.version != 0xFFFFU )
103  {
104  *tsb = (FT_Short)( face->os2.sTypoAscender - yMax );
105  *ah = (FT_UShort)FT_ABS( face->os2.sTypoAscender -
106  face->os2.sTypoDescender );
107  }
108 
109  else
110  {
111  *tsb = (FT_Short)( face->horizontal.Ascender - yMax );
112  *ah = (FT_UShort)FT_ABS( face->horizontal.Ascender -
113  face->horizontal.Descender );
114  }
115 
116  FT_TRACE5(( " advance height (font units): %d\n", *ah ));
117  FT_TRACE5(( " top side bearing (font units): %d\n", *tsb ));
118  }
119 
120 
121  static FT_Error
122  tt_get_metrics( TT_Loader loader,
123  FT_UInt glyph_index )
124  {
125  TT_Face face = loader->face;
126 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
127  TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );
128 #endif
129 
130  FT_Error error;
131  FT_Stream stream = loader->stream;
132 
133  FT_Short left_bearing = 0, top_bearing = 0;
134  FT_UShort advance_width = 0, advance_height = 0;
135 
136  /* we must preserve the stream position */
137  /* (which gets altered by the metrics functions) */
138  FT_ULong pos = FT_STREAM_POS();
139 
140 
141  TT_Get_HMetrics( face, glyph_index,
142  &left_bearing,
143  &advance_width );
144  TT_Get_VMetrics( face, glyph_index,
145  loader->bbox.yMax,
146  &top_bearing,
147  &advance_height );
148 
149  if ( FT_STREAM_SEEK( pos ) )
150  return error;
151 
152  loader->left_bearing = left_bearing;
153  loader->advance = advance_width;
154  loader->top_bearing = top_bearing;
155  loader->vadvance = advance_height;
156 
157 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
158  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 &&
159  loader->exec )
160  {
161  loader->exec->sph_tweak_flags = 0;
162 
163  /* This may not be the right place for this, but it works... */
164  /* Note that we have to unconditionally load the tweaks since */
165  /* it is possible that glyphs individually switch ClearType's */
166  /* backward compatibility mode on and off. */
167  sph_set_tweaks( loader, glyph_index );
168  }
169 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
170 
171  if ( !loader->linear_def )
172  {
173  loader->linear_def = 1;
174  loader->linear = advance_width;
175  }
176 
177  return FT_Err_Ok;
178  }
179 
180 
181 #ifdef FT_CONFIG_OPTION_INCREMENTAL
182 
183  static void
184  tt_get_metrics_incr_overrides( TT_Loader loader,
185  FT_UInt glyph_index )
186  {
187  TT_Face face = loader->face;
188 
189  FT_Short left_bearing = 0, top_bearing = 0;
190  FT_UShort advance_width = 0, advance_height = 0;
191 
192 
193  /* If this is an incrementally loaded font check whether there are */
194  /* overriding metrics for this glyph. */
195  if ( face->root.internal->incremental_interface &&
196  face->root.internal->incremental_interface->funcs->get_glyph_metrics )
197  {
198  FT_Incremental_MetricsRec incr_metrics;
199  FT_Error error;
200 
201 
202  incr_metrics.bearing_x = loader->left_bearing;
203  incr_metrics.bearing_y = 0;
204  incr_metrics.advance = loader->advance;
205  incr_metrics.advance_v = 0;
206 
207  error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
208  face->root.internal->incremental_interface->object,
209  glyph_index, FALSE, &incr_metrics );
210  if ( error )
211  goto Exit;
212 
213  left_bearing = (FT_Short)incr_metrics.bearing_x;
214  advance_width = (FT_UShort)incr_metrics.advance;
215 
216 #if 0
217 
218  /* GWW: Do I do the same for vertical metrics? */
219  incr_metrics.bearing_x = 0;
220  incr_metrics.bearing_y = loader->top_bearing;
221  incr_metrics.advance = loader->vadvance;
222 
223  error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
224  face->root.internal->incremental_interface->object,
225  glyph_index, TRUE, &incr_metrics );
226  if ( error )
227  goto Exit;
228 
229  top_bearing = (FT_Short)incr_metrics.bearing_y;
230  advance_height = (FT_UShort)incr_metrics.advance;
231 
232 #endif /* 0 */
233 
234  loader->left_bearing = left_bearing;
235  loader->advance = advance_width;
236  loader->top_bearing = top_bearing;
237  loader->vadvance = advance_height;
238 
239  if ( !loader->linear_def )
240  {
241  loader->linear_def = 1;
242  loader->linear = advance_width;
243  }
244  }
245 
246  Exit:
247  return;
248  }
249 
250 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
251 
252 
253  /*************************************************************************/
254  /* */
255  /* The following functions are used by default with TrueType fonts. */
256  /* However, they can be replaced by alternatives if we need to support */
257  /* TrueType-compressed formats (like MicroType) in the future. */
258  /* */
259  /*************************************************************************/
260 
261  FT_CALLBACK_DEF( FT_Error )
262  TT_Access_Glyph_Frame( TT_Loader loader,
263  FT_UInt glyph_index,
264  FT_ULong offset,
265  FT_UInt byte_count )
266  {
267  FT_Error error;
268  FT_Stream stream = loader->stream;
269 
270  /* for non-debug mode */
271  FT_UNUSED( glyph_index );
272 
273 
274  FT_TRACE4(( "Glyph %ld\n", glyph_index ));
275 
276  /* the following line sets the `error' variable through macros! */
277  if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) )
278  return error;
279 
280  loader->cursor = stream->cursor;
281  loader->limit = stream->limit;
282 
283  return FT_Err_Ok;
284  }
285 
286 
287  FT_CALLBACK_DEF( void )
288  TT_Forget_Glyph_Frame( TT_Loader loader )
289  {
290  FT_Stream stream = loader->stream;
291 
292 
293  FT_FRAME_EXIT();
294  }
295 
296 
297  FT_CALLBACK_DEF( FT_Error )
298  TT_Load_Glyph_Header( TT_Loader loader )
299  {
300  FT_Byte* p = loader->cursor;
301  FT_Byte* limit = loader->limit;
302 
303 
304  if ( p + 10 > limit )
305  return FT_THROW( Invalid_Outline );
306 
307  loader->n_contours = FT_NEXT_SHORT( p );
308 
309  loader->bbox.xMin = FT_NEXT_SHORT( p );
310  loader->bbox.yMin = FT_NEXT_SHORT( p );
311  loader->bbox.xMax = FT_NEXT_SHORT( p );
312  loader->bbox.yMax = FT_NEXT_SHORT( p );
313 
314  FT_TRACE5(( " # of contours: %d\n", loader->n_contours ));
315  FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin,
316  loader->bbox.xMax ));
317  FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin,
318  loader->bbox.yMax ));
319  loader->cursor = p;
320 
321  return FT_Err_Ok;
322  }
323 
324 
325  FT_CALLBACK_DEF( FT_Error )
326  TT_Load_Simple_Glyph( TT_Loader load )
327  {
328  FT_Error error;
329  FT_Byte* p = load->cursor;
330  FT_Byte* limit = load->limit;
331  FT_GlyphLoader gloader = load->gloader;
332  FT_Int n_contours = load->n_contours;
333  FT_Outline* outline;
334  FT_UShort n_ins;
335  FT_Int n_points;
336 
337  FT_Byte *flag, *flag_limit;
338  FT_Byte c, count;
339  FT_Vector *vec, *vec_limit;
340  FT_Pos x;
341  FT_Short *cont, *cont_limit, prev_cont;
342  FT_Int xy_size = 0;
343 
344 
345  /* check that we can add the contours to the glyph */
346  error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours );
347  if ( error )
348  goto Fail;
349 
350  /* reading the contours' endpoints & number of points */
351  cont = gloader->current.outline.contours;
352  cont_limit = cont + n_contours;
353 
354  /* check space for contours array + instructions count */
355  if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit )
356  goto Invalid_Outline;
357 
358  prev_cont = FT_NEXT_SHORT( p );
359 
360  if ( n_contours > 0 )
361  cont[0] = prev_cont;
362 
363  if ( prev_cont < 0 )
364  goto Invalid_Outline;
365 
366  for ( cont++; cont < cont_limit; cont++ )
367  {
368  cont[0] = FT_NEXT_SHORT( p );
369  if ( cont[0] <= prev_cont )
370  {
371  /* unordered contours: this is invalid */
372  goto Invalid_Outline;
373  }
374  prev_cont = cont[0];
375  }
376 
377  n_points = 0;
378  if ( n_contours > 0 )
379  {
380  n_points = cont[-1] + 1;
381  if ( n_points < 0 )
382  goto Invalid_Outline;
383  }
384 
385  /* note that we will add four phantom points later */
386  error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 );
387  if ( error )
388  goto Fail;
389 
390  /* reading the bytecode instructions */
391  load->glyph->control_len = 0;
392  load->glyph->control_data = NULL;
393 
394  if ( p + 2 > limit )
395  goto Invalid_Outline;
396 
397  n_ins = FT_NEXT_USHORT( p );
398 
399  FT_TRACE5(( " Instructions size: %u\n", n_ins ));
400 
401 #ifdef TT_USE_BYTECODE_INTERPRETER
402 
403  if ( IS_HINTED( load->load_flags ) )
404  {
405  FT_ULong tmp;
406 
407 
408  /* check instructions size */
409  if ( ( limit - p ) < n_ins )
410  {
411  FT_TRACE1(( "TT_Load_Simple_Glyph: instruction count mismatch\n" ));
412  error = FT_THROW( Too_Many_Hints );
413  goto Fail;
414  }
415 
416  /* we don't trust `maxSizeOfInstructions' in the `maxp' table */
417  /* and thus update the bytecode array size by ourselves */
418 
419  tmp = load->exec->glyphSize;
420  error = Update_Max( load->exec->memory,
421  &tmp,
422  sizeof ( FT_Byte ),
423  (void*)&load->exec->glyphIns,
424  n_ins );
425 
426  load->exec->glyphSize = (FT_UShort)tmp;
427  if ( error )
428  return error;
429 
430  load->glyph->control_len = n_ins;
431  load->glyph->control_data = load->exec->glyphIns;
432 
433  if ( n_ins )
434  FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );
435  }
436 
437 #endif /* TT_USE_BYTECODE_INTERPRETER */
438 
439  p += n_ins;
440 
441  outline = &gloader->current.outline;
442 
443  /* reading the point tags */
444  flag = (FT_Byte*)outline->tags;
445  flag_limit = flag + n_points;
446 
447  FT_ASSERT( flag );
448 
449  while ( flag < flag_limit )
450  {
451  if ( p + 1 > limit )
452  goto Invalid_Outline;
453 
454  *flag++ = c = FT_NEXT_BYTE( p );
455  if ( c & 8 )
456  {
457  if ( p + 1 > limit )
458  goto Invalid_Outline;
459 
460  count = FT_NEXT_BYTE( p );
461  if ( flag + (FT_Int)count > flag_limit )
462  goto Invalid_Outline;
463 
464  for ( ; count > 0; count-- )
465  *flag++ = c;
466  }
467  }
468 
469  /* reading the X coordinates */
470 
471  vec = outline->points;
472  vec_limit = vec + n_points;
473  flag = (FT_Byte*)outline->tags;
474  x = 0;
475 
476  if ( p + xy_size > limit )
477  goto Invalid_Outline;
478 
479  for ( ; vec < vec_limit; vec++, flag++ )
480  {
481  FT_Pos y = 0;
482  FT_Byte f = *flag;
483 
484 
485  if ( f & 2 )
486  {
487  if ( p + 1 > limit )
488  goto Invalid_Outline;
489 
490  y = (FT_Pos)FT_NEXT_BYTE( p );
491  if ( ( f & 16 ) == 0 )
492  y = -y;
493  }
494  else if ( ( f & 16 ) == 0 )
495  {
496  if ( p + 2 > limit )
497  goto Invalid_Outline;
498 
499  y = (FT_Pos)FT_NEXT_SHORT( p );
500  }
501 
502  x += y;
503  vec->x = x;
504  /* the cast is for stupid compilers */
505  *flag = (FT_Byte)( f & ~( 2 | 16 ) );
506  }
507 
508  /* reading the Y coordinates */
509 
510  vec = gloader->current.outline.points;
511  vec_limit = vec + n_points;
512  flag = (FT_Byte*)outline->tags;
513  x = 0;
514 
515  for ( ; vec < vec_limit; vec++, flag++ )
516  {
517  FT_Pos y = 0;
518  FT_Byte f = *flag;
519 
520 
521  if ( f & 4 )
522  {
523  if ( p + 1 > limit )
524  goto Invalid_Outline;
525 
526  y = (FT_Pos)FT_NEXT_BYTE( p );
527  if ( ( f & 32 ) == 0 )
528  y = -y;
529  }
530  else if ( ( f & 32 ) == 0 )
531  {
532  if ( p + 2 > limit )
533  goto Invalid_Outline;
534 
535  y = (FT_Pos)FT_NEXT_SHORT( p );
536  }
537 
538  x += y;
539  vec->y = x;
540  /* the cast is for stupid compilers */
541  *flag = (FT_Byte)( f & FT_CURVE_TAG_ON );
542  }
543 
544  outline->n_points = (FT_Short)n_points;
545  outline->n_contours = (FT_Short)n_contours;
546 
547  load->cursor = p;
548 
549  Fail:
550  return error;
551 
552  Invalid_Outline:
553  error = FT_THROW( Invalid_Outline );
554  goto Fail;
555  }
556 
557 
558  FT_CALLBACK_DEF( FT_Error )
559  TT_Load_Composite_Glyph( TT_Loader loader )
560  {
561  FT_Error error;
562  FT_Byte* p = loader->cursor;
563  FT_Byte* limit = loader->limit;
564  FT_GlyphLoader gloader = loader->gloader;
565  FT_SubGlyph subglyph;
566  FT_UInt num_subglyphs;
567 
568 
569  num_subglyphs = 0;
570 
571  do
572  {
573  FT_Fixed xx, xy, yy, yx;
574  FT_UInt count;
575 
576 
577  /* check that we can load a new subglyph */
578  error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 );
579  if ( error )
580  goto Fail;
581 
582  /* check space */
583  if ( p + 4 > limit )
584  goto Invalid_Composite;
585 
586  subglyph = gloader->current.subglyphs + num_subglyphs;
587 
588  subglyph->arg1 = subglyph->arg2 = 0;
589 
590  subglyph->flags = FT_NEXT_USHORT( p );
591  subglyph->index = FT_NEXT_USHORT( p );
592 
593  /* check space */
594  count = 2;
595  if ( subglyph->flags & ARGS_ARE_WORDS )
596  count += 2;
597  if ( subglyph->flags & WE_HAVE_A_SCALE )
598  count += 2;
599  else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
600  count += 4;
601  else if ( subglyph->flags & WE_HAVE_A_2X2 )
602  count += 8;
603 
604  if ( p + count > limit )
605  goto Invalid_Composite;
606 
607  /* read arguments */
608  if ( subglyph->flags & ARGS_ARE_XY_VALUES )
609  {
610  if ( subglyph->flags & ARGS_ARE_WORDS )
611  {
612  subglyph->arg1 = FT_NEXT_SHORT( p );
613  subglyph->arg2 = FT_NEXT_SHORT( p );
614  }
615  else
616  {
617  subglyph->arg1 = FT_NEXT_CHAR( p );
618  subglyph->arg2 = FT_NEXT_CHAR( p );
619  }
620  }
621  else
622  {
623  if ( subglyph->flags & ARGS_ARE_WORDS )
624  {
625  subglyph->arg1 = (FT_Int)FT_NEXT_USHORT( p );
626  subglyph->arg2 = (FT_Int)FT_NEXT_USHORT( p );
627  }
628  else
629  {
630  subglyph->arg1 = (FT_Int)FT_NEXT_BYTE( p );
631  subglyph->arg2 = (FT_Int)FT_NEXT_BYTE( p );
632  }
633  }
634 
635  /* read transform */
636  xx = yy = 0x10000L;
637  xy = yx = 0;
638 
639  if ( subglyph->flags & WE_HAVE_A_SCALE )
640  {
641  xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
642  yy = xx;
643  }
644  else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
645  {
646  xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
647  yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
648  }
649  else if ( subglyph->flags & WE_HAVE_A_2X2 )
650  {
651  xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
652  yx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
653  xy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
654  yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
655  }
656 
657  subglyph->transform.xx = xx;
658  subglyph->transform.xy = xy;
659  subglyph->transform.yx = yx;
660  subglyph->transform.yy = yy;
661 
662  num_subglyphs++;
663 
664  } while ( subglyph->flags & MORE_COMPONENTS );
665 
666  gloader->current.num_subglyphs = num_subglyphs;
667  FT_TRACE5(( " %d component%s\n",
668  num_subglyphs,
669  num_subglyphs > 1 ? "s" : "" ));
670 
671 #ifdef FT_DEBUG_LEVEL_TRACE
672  {
673  FT_UInt i;
674 
675 
676  subglyph = gloader->current.subglyphs;
677 
678  for ( i = 0; i < num_subglyphs; i++ )
679  {
680  if ( num_subglyphs > 1 )
681  FT_TRACE7(( " subglyph %d:\n", i ));
682 
683  FT_TRACE7(( " glyph index: %d\n", subglyph->index ));
684 
685  if ( subglyph->flags & ARGS_ARE_XY_VALUES )
686  FT_TRACE7(( " offset: x=%d, y=%d\n",
687  subglyph->arg1,
688  subglyph->arg2 ));
689  else
690  FT_TRACE7(( " matching points: base=%d, component=%d\n",
691  subglyph->arg1,
692  subglyph->arg2 ));
693 
694  if ( subglyph->flags & WE_HAVE_A_SCALE )
695  FT_TRACE7(( " scaling: %f\n",
696  subglyph->transform.xx / 65536.0 ));
697  else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
698  FT_TRACE7(( " scaling: x=%f, y=%f\n",
699  subglyph->transform.xx / 65536.0,
700  subglyph->transform.yy / 65536.0 ));
701  else if ( subglyph->flags & WE_HAVE_A_2X2 )
702  FT_TRACE7(( " scaling: xx=%f, yx=%f\n"
703  " xy=%f, yy=%f\n",
704  subglyph->transform.xx / 65536.0,
705  subglyph->transform.yx / 65536.0,
706  subglyph->transform.xy / 65536.0,
707  subglyph->transform.yy / 65536.0 ));
708 
709  subglyph++;
710  }
711  }
712 #endif /* FT_DEBUG_LEVEL_TRACE */
713 
714 #ifdef TT_USE_BYTECODE_INTERPRETER
715 
716  {
717  FT_Stream stream = loader->stream;
718 
719 
720  /* we must undo the FT_FRAME_ENTER in order to point */
721  /* to the composite instructions, if we find some. */
722  /* We will process them later. */
723  /* */
724  loader->ins_pos = (FT_ULong)( FT_STREAM_POS() +
725  p - limit );
726  }
727 
728 #endif
729 
730  loader->cursor = p;
731 
732  Fail:
733  return error;
734 
735  Invalid_Composite:
736  error = FT_THROW( Invalid_Composite );
737  goto Fail;
738  }
739 
740 
741  FT_LOCAL_DEF( void )
742  TT_Init_Glyph_Loading( TT_Face face )
743  {
744  face->access_glyph_frame = TT_Access_Glyph_Frame;
745  face->read_glyph_header = TT_Load_Glyph_Header;
746  face->read_simple_glyph = TT_Load_Simple_Glyph;
747  face->read_composite_glyph = TT_Load_Composite_Glyph;
748  face->forget_glyph_frame = TT_Forget_Glyph_Frame;
749  }
750 
751 
752  static void
753  tt_prepare_zone( TT_GlyphZone zone,
754  FT_GlyphLoad load,
755  FT_UInt start_point,
756  FT_UInt start_contour )
757  {
758  zone->n_points = (FT_UShort)load->outline.n_points -
759  (FT_UShort)start_point;
760  zone->n_contours = load->outline.n_contours -
761  (FT_Short)start_contour;
762  zone->org = load->extra_points + start_point;
763  zone->cur = load->outline.points + start_point;
764  zone->orus = load->extra_points2 + start_point;
765  zone->tags = (FT_Byte*)load->outline.tags + start_point;
766  zone->contours = (FT_UShort*)load->outline.contours + start_contour;
767  zone->first_point = (FT_UShort)start_point;
768  }
769 
770 
771  /*************************************************************************/
772  /* */
773  /* <Function> */
774  /* TT_Hint_Glyph */
775  /* */
776  /* <Description> */
777  /* Hint the glyph using the zone prepared by the caller. Note that */
778  /* the zone is supposed to include four phantom points. */
779  /* */
780  static FT_Error
781  TT_Hint_Glyph( TT_Loader loader,
782  FT_Bool is_composite )
783  {
784 #if defined TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY || \
785  defined TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
786  TT_Face face = loader->face;
787  TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );
788 #endif
789 
790  TT_GlyphZone zone = &loader->zone;
791 
792 #ifdef TT_USE_BYTECODE_INTERPRETER
793  FT_Long n_ins;
794 #else
795  FT_UNUSED( is_composite );
796 #endif
797 
798 
799 #ifdef TT_USE_BYTECODE_INTERPRETER
800  if ( loader->glyph->control_len > 0xFFFFL )
801  {
802  FT_TRACE1(( "TT_Hint_Glyph: too long instructions" ));
803  FT_TRACE1(( " (0x%lx byte) is truncated\n",
804  loader->glyph->control_len ));
805  }
806  n_ins = loader->glyph->control_len;
807 
808  /* save original point position in org */
809  if ( n_ins > 0 )
810  FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points );
811 
812  /* Reset graphics state. */
813  loader->exec->GS = loader->size->GS;
814 
815  /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */
816  /* completely refer to the (already) hinted subglyphs. */
817  if ( is_composite )
818  {
819  loader->exec->metrics.x_scale = 1 << 16;
820  loader->exec->metrics.y_scale = 1 << 16;
821 
822  FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points );
823  }
824  else
825  {
826  loader->exec->metrics.x_scale = loader->size->metrics->x_scale;
827  loader->exec->metrics.y_scale = loader->size->metrics->y_scale;
828  }
829 #endif
830 
831  /* round phantom points */
832  zone->cur[zone->n_points - 4].x =
833  FT_PIX_ROUND( zone->cur[zone->n_points - 4].x );
834  zone->cur[zone->n_points - 3].x =
835  FT_PIX_ROUND( zone->cur[zone->n_points - 3].x );
836  zone->cur[zone->n_points - 2].y =
837  FT_PIX_ROUND( zone->cur[zone->n_points - 2].y );
838  zone->cur[zone->n_points - 1].y =
839  FT_PIX_ROUND( zone->cur[zone->n_points - 1].y );
840 
841 #ifdef TT_USE_BYTECODE_INTERPRETER
842 
843  if ( n_ins > 0 )
844  {
845  FT_Error error;
846 
847  FT_GlyphLoader gloader = loader->gloader;
848  FT_Outline current_outline = gloader->current.outline;
849 
850 
851  TT_Set_CodeRange( loader->exec, tt_coderange_glyph,
852  loader->exec->glyphIns, n_ins );
853 
854  loader->exec->is_composite = is_composite;
855  loader->exec->pts = *zone;
856 
857  error = TT_Run_Context( loader->exec );
858  if ( error && loader->exec->pedantic_hinting )
859  return error;
860 
861  /* store drop-out mode in bits 5-7; set bit 2 also as a marker */
862  current_outline.tags[0] |=
863  ( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE;
864  }
865 
866 #endif
867 
868 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
869  /* Save possibly modified glyph phantom points unless in v40 backward */
870  /* compatibility mode, where no movement on the x axis means no reason */
871  /* to change bearings or advance widths. */
872  if ( !( driver->interpreter_version == TT_INTERPRETER_VERSION_40 &&
873  loader->exec->backward_compatibility ) )
874  {
875 #endif
876  loader->pp1 = zone->cur[zone->n_points - 4];
877  loader->pp2 = zone->cur[zone->n_points - 3];
878  loader->pp3 = zone->cur[zone->n_points - 2];
879  loader->pp4 = zone->cur[zone->n_points - 1];
880 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
881  }
882 #endif
883 
884 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
885  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
886  {
887  if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN )
888  FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 );
889 
890  else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN )
891  FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 );
892  }
893 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
894 
895  return FT_Err_Ok;
896  }
897 
898 
899  /*************************************************************************/
900  /* */
901  /* <Function> */
902  /* TT_Process_Simple_Glyph */
903  /* */
904  /* <Description> */
905  /* Once a simple glyph has been loaded, it needs to be processed. */
906  /* Usually, this means scaling and hinting through bytecode */
907  /* interpretation. */
908  /* */
909  static FT_Error
910  TT_Process_Simple_Glyph( TT_Loader loader )
911  {
912  FT_GlyphLoader gloader = loader->gloader;
913  FT_Error error = FT_Err_Ok;
914  FT_Outline* outline;
915  FT_Int n_points;
916 
917 
918  outline = &gloader->current.outline;
919  n_points = outline->n_points;
920 
921  /* set phantom points */
922 
923  outline->points[n_points ] = loader->pp1;
924  outline->points[n_points + 1] = loader->pp2;
925  outline->points[n_points + 2] = loader->pp3;
926  outline->points[n_points + 3] = loader->pp4;
927 
928  outline->tags[n_points ] = 0;
929  outline->tags[n_points + 1] = 0;
930  outline->tags[n_points + 2] = 0;
931  outline->tags[n_points + 3] = 0;
932 
933  n_points += 4;
934 
935 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
936 
937  if ( FT_IS_NAMED_INSTANCE( FT_FACE( loader->face ) ) ||
938  FT_IS_VARIATION( FT_FACE( loader->face ) ) )
939  {
940  /* Deltas apply to the unscaled data. */
941  error = TT_Vary_Apply_Glyph_Deltas( loader->face,
942  loader->glyph_index,
943  outline,
944  (FT_UInt)n_points );
945 
946  /* recalculate linear horizontal and vertical advances */
947  /* if we don't have HVAR and VVAR, respectively */
948  if ( !( loader->face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) )
949  loader->linear = outline->points[n_points - 3].x -
950  outline->points[n_points - 4].x;
951  if ( !( loader->face->variation_support & TT_FACE_FLAG_VAR_VADVANCE ) )
952  loader->vadvance = outline->points[n_points - 1].x -
953  outline->points[n_points - 2].x;
954 
955  if ( error )
956  return error;
957  }
958 
959 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
960 
961  if ( IS_HINTED( loader->load_flags ) )
962  {
963  tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 );
964 
965  FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur,
966  loader->zone.n_points + 4 );
967  }
968 
969  {
970 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
971  TT_Face face = loader->face;
972  TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );
973 
974  FT_String* family = face->root.family_name;
975  FT_UInt ppem = loader->size->metrics->x_ppem;
976  FT_String* style = face->root.style_name;
977  FT_UInt x_scale_factor = 1000;
978 #endif
979 
980  FT_Vector* vec = outline->points;
981  FT_Vector* limit = outline->points + n_points;
982 
983  FT_Fixed x_scale = 0; /* pacify compiler */
984  FT_Fixed y_scale = 0;
985 
986  FT_Bool do_scale = FALSE;
987 
988 
989 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
990 
991  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
992  {
993  /* scale, but only if enabled and only if TT hinting is being used */
994  if ( IS_HINTED( loader->load_flags ) )
995  x_scale_factor = sph_test_tweak_x_scaling( face,
996  family,
997  ppem,
998  style,
999  loader->glyph_index );
1000  /* scale the glyph */
1001  if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ||
1002  x_scale_factor != 1000 )
1003  {
1004  x_scale = FT_MulDiv( loader->size->metrics->x_scale,
1005  (FT_Long)x_scale_factor, 1000 );
1006  y_scale = loader->size->metrics->y_scale;
1007 
1008  /* compensate for any scaling by de/emboldening; */
1009  /* the amount was determined via experimentation */
1010  if ( x_scale_factor != 1000 && ppem > 11 )
1011  FT_Outline_EmboldenXY( outline,
1012  FT_MulFix( 1280 * ppem,
1013  1000 - x_scale_factor ),
1014  0 );
1015  do_scale = TRUE;
1016  }
1017  }
1018  else
1019 
1020 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
1021 
1022  {
1023  /* scale the glyph */
1024  if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1025  {
1026  x_scale = loader->size->metrics->x_scale;
1027  y_scale = loader->size->metrics->y_scale;
1028 
1029  do_scale = TRUE;
1030  }
1031  }
1032 
1033  if ( do_scale )
1034  {
1035  for ( ; vec < limit; vec++ )
1036  {
1037  vec->x = FT_MulFix( vec->x, x_scale );
1038  vec->y = FT_MulFix( vec->y, y_scale );
1039  }
1040  }
1041 
1042 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1043  /* if we have a HVAR table, `pp1' and/or `pp2' are already adjusted */
1044  if ( !( loader->face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) ||
1045  !IS_HINTED( loader->load_flags ) )
1046 #endif
1047  {
1048  loader->pp1 = outline->points[n_points - 4];
1049  loader->pp2 = outline->points[n_points - 3];
1050  }
1051 
1052 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1053  /* if we have a VVAR table, `pp3' and/or `pp4' are already adjusted */
1054  if ( !( loader->face->variation_support & TT_FACE_FLAG_VAR_VADVANCE ) ||
1055  !IS_HINTED( loader->load_flags ) )
1056 #endif
1057  {
1058  loader->pp3 = outline->points[n_points - 2];
1059  loader->pp4 = outline->points[n_points - 1];
1060  }
1061  }
1062 
1063  if ( IS_HINTED( loader->load_flags ) )
1064  {
1065  loader->zone.n_points += 4;
1066 
1067  error = TT_Hint_Glyph( loader, 0 );
1068  }
1069 
1070  return error;
1071  }
1072 
1073 
1074  /*************************************************************************/
1075  /* */
1076  /* <Function> */
1077  /* TT_Process_Composite_Component */
1078  /* */
1079  /* <Description> */
1080  /* Once a composite component has been loaded, it needs to be */
1081  /* processed. Usually, this means transforming and translating. */
1082  /* */
1083  static FT_Error
1084  TT_Process_Composite_Component( TT_Loader loader,
1085  FT_SubGlyph subglyph,
1086  FT_UInt start_point,
1087  FT_UInt num_base_points )
1088  {
1089  FT_GlyphLoader gloader = loader->gloader;
1090  FT_Outline current;
1091  FT_Bool have_scale;
1092  FT_Pos x, y;
1093 
1094 
1095  current.points = gloader->base.outline.points +
1096  num_base_points;
1097  current.n_points = gloader->base.outline.n_points -
1098  (short)num_base_points;
1099 
1100  have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE |
1101  WE_HAVE_AN_XY_SCALE |
1102  WE_HAVE_A_2X2 ) );
1103 
1104  /* perform the transform required for this subglyph */
1105  if ( have_scale )
1106  FT_Outline_Transform( &current, &subglyph->transform );
1107 
1108  /* get offset */
1109  if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
1110  {
1111  FT_UInt num_points = (FT_UInt)gloader->base.outline.n_points;
1112  FT_UInt k = (FT_UInt)subglyph->arg1;
1113  FT_UInt l = (FT_UInt)subglyph->arg2;
1114  FT_Vector* p1;
1115  FT_Vector* p2;
1116 
1117 
1118  /* match l-th point of the newly loaded component to the k-th point */
1119  /* of the previously loaded components. */
1120 
1121  /* change to the point numbers used by our outline */
1122  k += start_point;
1123  l += num_base_points;
1124  if ( k >= num_base_points ||
1125  l >= num_points )
1126  return FT_THROW( Invalid_Composite );
1127 
1128  p1 = gloader->base.outline.points + k;
1129  p2 = gloader->base.outline.points + l;
1130 
1131  x = p1->x - p2->x;
1132  y = p1->y - p2->y;
1133  }
1134  else
1135  {
1136  x = subglyph->arg1;
1137  y = subglyph->arg2;
1138 
1139  if ( !x && !y )
1140  return FT_Err_Ok;
1141 
1142  /* Use a default value dependent on */
1143  /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old */
1144  /* TT fonts which don't set the xxx_COMPONENT_OFFSET bit. */
1145 
1146  if ( have_scale &&
1147 #ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
1148  !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )
1149 #else
1150  ( subglyph->flags & SCALED_COMPONENT_OFFSET ) )
1151 #endif
1152  {
1153 
1154 #if 0
1155 
1156  /*******************************************************************/
1157  /* */
1158  /* This algorithm is what Apple documents. But it doesn't work. */
1159  /* */
1160  int a = subglyph->transform.xx > 0 ? subglyph->transform.xx
1161  : -subglyph->transform.xx;
1162  int b = subglyph->transform.yx > 0 ? subglyph->transform.yx
1163  : -subglyph->transform.yx;
1164  int c = subglyph->transform.xy > 0 ? subglyph->transform.xy
1165  : -subglyph->transform.xy;
1166  int d = subglyph->transform.yy > 0 ? subglyph->transform.yy
1167  : -subglyph->transform.yy;
1168  int m = a > b ? a : b;
1169  int n = c > d ? c : d;
1170 
1171 
1172  if ( a - b <= 33 && a - b >= -33 )
1173  m *= 2;
1174  if ( c - d <= 33 && c - d >= -33 )
1175  n *= 2;
1176  x = FT_MulFix( x, m );
1177  y = FT_MulFix( y, n );
1178 
1179 #else /* 1 */
1180 
1181  /*******************************************************************/
1182  /* */
1183  /* This algorithm is a guess and works much better than the above. */
1184  /* */
1185  FT_Fixed mac_xscale = FT_Hypot( subglyph->transform.xx,
1186  subglyph->transform.xy );
1187  FT_Fixed mac_yscale = FT_Hypot( subglyph->transform.yy,
1188  subglyph->transform.yx );
1189 
1190 
1191  x = FT_MulFix( x, mac_xscale );
1192  y = FT_MulFix( y, mac_yscale );
1193 
1194 #endif /* 1 */
1195 
1196  }
1197 
1198  if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
1199  {
1200  FT_Fixed x_scale = loader->size->metrics->x_scale;
1201  FT_Fixed y_scale = loader->size->metrics->y_scale;
1202 
1203 
1204  x = FT_MulFix( x, x_scale );
1205  y = FT_MulFix( y, y_scale );
1206 
1207  if ( subglyph->flags & ROUND_XY_TO_GRID )
1208  {
1209  TT_Face face = loader->face;
1210  TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );
1211 
1212 
1213  if ( IS_HINTED( loader->load_flags ) )
1214  {
1215  /*
1216  * We round the horizontal offset only if there is hinting along
1217  * the x axis; this corresponds to integer advance width values.
1218  *
1219  * Theoretically, a glyph's bytecode can toggle ClearType's
1220  * `backward compatibility' mode, which would allow modification
1221  * of the advance width. In reality, however, applications
1222  * neither allow nor expect modified advance widths if sub-pixel
1223  * rendering is active.
1224  *
1225  */
1226  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_35 )
1227  x = FT_PIX_ROUND( x );
1228 
1229  y = FT_PIX_ROUND( y );
1230  }
1231  }
1232  }
1233  }
1234 
1235  if ( x || y )
1236  FT_Outline_Translate( &current, x, y );
1237 
1238  return FT_Err_Ok;
1239  }
1240 
1241 
1242  /*************************************************************************/
1243  /* */
1244  /* <Function> */
1245  /* TT_Process_Composite_Glyph */
1246  /* */
1247  /* <Description> */
1248  /* This is slightly different from TT_Process_Simple_Glyph, in that */
1249  /* its sole purpose is to hint the glyph. Thus this function is */
1250  /* only available when bytecode interpreter is enabled. */
1251  /* */
1252  static FT_Error
1253  TT_Process_Composite_Glyph( TT_Loader loader,
1254  FT_UInt start_point,
1255  FT_UInt start_contour )
1256  {
1257  FT_Error error;
1258  FT_Outline* outline;
1259  FT_UInt i;
1260 
1261 
1262  outline = &loader->gloader->base.outline;
1263 
1264  /* make room for phantom points */
1265  error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,
1266  outline->n_points + 4,
1267  0 );
1268  if ( error )
1269  return error;
1270 
1271  outline->points[outline->n_points ] = loader->pp1;
1272  outline->points[outline->n_points + 1] = loader->pp2;
1273  outline->points[outline->n_points + 2] = loader->pp3;
1274  outline->points[outline->n_points + 3] = loader->pp4;
1275 
1276  outline->tags[outline->n_points ] = 0;
1277  outline->tags[outline->n_points + 1] = 0;
1278  outline->tags[outline->n_points + 2] = 0;
1279  outline->tags[outline->n_points + 3] = 0;
1280 
1281 #ifdef TT_USE_BYTECODE_INTERPRETER
1282 
1283  {
1284  FT_Stream stream = loader->stream;
1285  FT_UShort n_ins, max_ins;
1286  FT_ULong tmp;
1287 
1288 
1289  /* TT_Load_Composite_Glyph only gives us the offset of instructions */
1290  /* so we read them here */
1291  if ( FT_STREAM_SEEK( loader->ins_pos ) ||
1292  FT_READ_USHORT( n_ins ) )
1293  return error;
1294 
1295  FT_TRACE5(( " Instructions size = %d\n", n_ins ));
1296 
1297  /* check it */
1298  max_ins = loader->face->max_profile.maxSizeOfInstructions;
1299  if ( n_ins > max_ins )
1300  {
1301  /* don't trust `maxSizeOfInstructions'; */
1302  /* only do a rough safety check */
1303  if ( (FT_Int)n_ins > loader->byte_len )
1304  {
1305  FT_TRACE1(( "TT_Process_Composite_Glyph:"
1306  " too many instructions (%d) for glyph with length %d\n",
1307  n_ins, loader->byte_len ));
1308  return FT_THROW( Too_Many_Hints );
1309  }
1310 
1311  tmp = loader->exec->glyphSize;
1312  error = Update_Max( loader->exec->memory,
1313  &tmp,
1314  sizeof ( FT_Byte ),
1315  (void*)&loader->exec->glyphIns,
1316  n_ins );
1317 
1318  loader->exec->glyphSize = (FT_UShort)tmp;
1319  if ( error )
1320  return error;
1321  }
1322  else if ( n_ins == 0 )
1323  return FT_Err_Ok;
1324 
1325  if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )
1326  return error;
1327 
1328  loader->glyph->control_data = loader->exec->glyphIns;
1329  loader->glyph->control_len = n_ins;
1330  }
1331 
1332 #endif
1333 
1334  tt_prepare_zone( &loader->zone, &loader->gloader->base,
1335  start_point, start_contour );
1336 
1337  /* Some points are likely touched during execution of */
1338  /* instructions on components. So let's untouch them. */
1339  for ( i = 0; i < loader->zone.n_points; i++ )
1340  loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH;
1341 
1342  loader->zone.n_points += 4;
1343 
1344  return TT_Hint_Glyph( loader, 1 );
1345  }
1346 
1347 
1348  /*
1349  * Calculate the phantom points
1350  *
1351  * Defining the right side bearing (rsb) as
1352  *
1353  * rsb = aw - (lsb + xmax - xmin)
1354  *
1355  * (with `aw' the advance width, `lsb' the left side bearing, and `xmin'
1356  * and `xmax' the glyph's minimum and maximum x value), the OpenType
1357  * specification defines the initial position of horizontal phantom points
1358  * as
1359  *
1360  * pp1 = (round(xmin - lsb), 0) ,
1361  * pp2 = (round(pp1 + aw), 0) .
1362  *
1363  * Note that the rounding to the grid (in the device space) is not
1364  * documented currently in the specification.
1365  *
1366  * However, the specification lacks the precise definition of vertical
1367  * phantom points. Greg Hitchcock provided the following explanation.
1368  *
1369  * - a `vmtx' table is present
1370  *
1371  * For any glyph, the minimum and maximum y values (`ymin' and `ymax')
1372  * are given in the `glyf' table, the top side bearing (tsb) and advance
1373  * height (ah) are given in the `vmtx' table. The bottom side bearing
1374  * (bsb) is then calculated as
1375  *
1376  * bsb = ah - (tsb + ymax - ymin) ,
1377  *
1378  * and the initial position of vertical phantom points is
1379  *
1380  * pp3 = (x, round(ymax + tsb)) ,
1381  * pp4 = (x, round(pp3 - ah)) .
1382  *
1383  * See below for value `x'.
1384  *
1385  * - no `vmtx' table in the font
1386  *
1387  * If there is an `OS/2' table, we set
1388  *
1389  * DefaultAscender = sTypoAscender ,
1390  * DefaultDescender = sTypoDescender ,
1391  *
1392  * otherwise we use data from the `hhea' table:
1393  *
1394  * DefaultAscender = Ascender ,
1395  * DefaultDescender = Descender .
1396  *
1397  * With these two variables we can now set
1398  *
1399  * ah = DefaultAscender - sDefaultDescender ,
1400  * tsb = DefaultAscender - yMax ,
1401  *
1402  * and proceed as if a `vmtx' table was present.
1403  *
1404  * Usually we have
1405  *
1406  * x = aw / 2 , (1)
1407  *
1408  * but there is one compatibility case where it can be set to
1409  *
1410  * x = -DefaultDescender -
1411  * ((DefaultAscender - DefaultDescender - aw) / 2) . (2)
1412  *
1413  * and another one with
1414  *
1415  * x = 0 . (3)
1416  *
1417  * In Windows, the history of those values is quite complicated,
1418  * depending on the hinting engine (that is, the graphics framework).
1419  *
1420  * framework from to formula
1421  * ----------------------------------------------------------
1422  * GDI Windows 98 current (1)
1423  * (Windows 2000 for NT)
1424  * GDI+ Windows XP Windows 7 (2)
1425  * GDI+ Windows 8 current (3)
1426  * DWrite Windows 7 current (3)
1427  *
1428  * For simplicity, FreeType uses (1) for grayscale subpixel hinting and
1429  * (3) for everything else.
1430  *
1431  */
1432  static void
1433  tt_loader_set_pp( TT_Loader loader )
1434  {
1435  FT_Bool subpixel_hinting = 0;
1436  FT_Bool grayscale = 0;
1437  FT_Bool use_aw_2 = 0;
1438 
1439 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
1440  TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( loader->face );
1441 #endif
1442 
1443 
1444 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
1445  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
1446  {
1447  subpixel_hinting = loader->exec ? loader->exec->subpixel_hinting
1448  : 0;
1449  grayscale = loader->exec ? loader->exec->grayscale
1450  : 0;
1451  }
1452 #endif
1453 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
1454  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 )
1455  {
1456  subpixel_hinting = loader->exec ? loader->exec->subpixel_hinting_lean
1457  : 0;
1458  grayscale = loader->exec ? loader->exec->grayscale_cleartype
1459  : 0;
1460  }
1461 #endif
1462 
1463  use_aw_2 = (FT_Bool)( subpixel_hinting && grayscale );
1464 
1465  loader->pp1.x = loader->bbox.xMin - loader->left_bearing;
1466  loader->pp1.y = 0;
1467  loader->pp2.x = loader->pp1.x + loader->advance;
1468  loader->pp2.y = 0;
1469 
1470  loader->pp3.x = use_aw_2 ? loader->advance / 2 : 0;
1471  loader->pp3.y = loader->bbox.yMax + loader->top_bearing;
1472  loader->pp4.x = use_aw_2 ? loader->advance / 2 : 0;
1473  loader->pp4.y = loader->pp3.y - loader->vadvance;
1474  }
1475 
1476 
1477  /* a utility function to retrieve i-th node from given FT_List */
1478  static FT_ListNode
1479  ft_list_get_node_at( FT_List list,
1480  FT_UInt idx )
1481  {
1482  FT_ListNode cur;
1483 
1484 
1485  if ( !list )
1486  return NULL;
1487 
1488  for ( cur = list->head; cur; cur = cur->next )
1489  {
1490  if ( !idx )
1491  return cur;
1492 
1493  idx--;
1494  }
1495 
1496  return NULL;
1497  }
1498 
1499 
1500  /*************************************************************************/
1501  /* */
1502  /* <Function> */
1503  /* load_truetype_glyph */
1504  /* */
1505  /* <Description> */
1506  /* Loads a given truetype glyph. Handles composites and uses a */
1507  /* TT_Loader object. */
1508  /* */
1509  static FT_Error
1510  load_truetype_glyph( TT_Loader loader,
1511  FT_UInt glyph_index,
1512  FT_UInt recurse_count,
1513  FT_Bool header_only )
1514  {
1515  FT_Error error = FT_Err_Ok;
1516  FT_Fixed x_scale, y_scale;
1517  FT_ULong offset;
1518  TT_Face face = loader->face;
1519  FT_GlyphLoader gloader = loader->gloader;
1520  FT_Bool opened_frame = 0;
1521 
1522 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1523  FT_StreamRec inc_stream;
1524  FT_Data glyph_data;
1525  FT_Bool glyph_data_loaded = 0;
1526 #endif
1527 
1528 
1529 #ifdef FT_DEBUG_LEVEL_TRACE
1530  if ( recurse_count )
1531  FT_TRACE5(( " nesting level: %d\n", recurse_count ));
1532 #endif
1533 
1534  /* some fonts have an incorrect value of `maxComponentDepth' */
1535  if ( recurse_count > face->max_profile.maxComponentDepth )
1536  {
1537  FT_TRACE1(( "load_truetype_glyph: maxComponentDepth set to %d\n",
1538  recurse_count ));
1539  face->max_profile.maxComponentDepth = (FT_UShort)recurse_count;
1540  }
1541 
1542 #ifndef FT_CONFIG_OPTION_INCREMENTAL
1543  /* check glyph index */
1544  if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
1545  {
1546  error = FT_THROW( Invalid_Glyph_Index );
1547  goto Exit;
1548  }
1549 #endif
1550 
1551  loader->glyph_index = glyph_index;
1552 
1553  if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1554  {
1555  x_scale = loader->size->metrics->x_scale;
1556  y_scale = loader->size->metrics->y_scale;
1557  }
1558  else
1559  {
1560  x_scale = 0x10000L;
1561  y_scale = 0x10000L;
1562  }
1563 
1564  /* Set `offset' to the start of the glyph relative to the start of */
1565  /* the `glyf' table, and `byte_len' to the length of the glyph in */
1566  /* bytes. */
1567 
1568 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1569 
1570  /* If we are loading glyph data via the incremental interface, set */
1571  /* the loader stream to a memory stream reading the data returned */
1572  /* by the interface. */
1573  if ( face->root.internal->incremental_interface )
1574  {
1575  error = face->root.internal->incremental_interface->funcs->get_glyph_data(
1576  face->root.internal->incremental_interface->object,
1577  glyph_index, &glyph_data );
1578  if ( error )
1579  goto Exit;
1580 
1581  glyph_data_loaded = 1;
1582  offset = 0;
1583  loader->byte_len = glyph_data.length;
1584 
1585  FT_ZERO( &inc_stream );
1586  FT_Stream_OpenMemory( &inc_stream,
1587  glyph_data.pointer,
1588  (FT_ULong)glyph_data.length );
1589 
1590  loader->stream = &inc_stream;
1591  }
1592  else
1593 
1594 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
1595 
1596  offset = tt_face_get_location( face, glyph_index,
1597  (FT_UInt*)&loader->byte_len );
1598 
1599  if ( loader->byte_len > 0 )
1600  {
1601 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1602  /* for the incremental interface, `glyf_offset' is always zero */
1603  if ( !face->glyf_offset &&
1604  !face->root.internal->incremental_interface )
1605 #else
1606  if ( !face->glyf_offset )
1607 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
1608  {
1609  FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" ));
1610  error = FT_THROW( Invalid_Table );
1611  goto Exit;
1612  }
1613 
1614  error = face->access_glyph_frame( loader, glyph_index,
1615  face->glyf_offset + offset,
1616  (FT_UInt)loader->byte_len );
1617  if ( error )
1618  goto Exit;
1619 
1620  opened_frame = 1;
1621 
1622  /* read glyph header first */
1623  error = face->read_glyph_header( loader );
1624  if ( error )
1625  goto Exit;
1626 
1627  /* the metrics must be computed after loading the glyph header */
1628  /* since we need the glyph's `yMax' value in case the vertical */
1629  /* metrics must be emulated */
1630  error = tt_get_metrics( loader, glyph_index );
1631  if ( error )
1632  goto Exit;
1633 
1634  if ( header_only )
1635  goto Exit;
1636  }
1637 
1638  if ( loader->byte_len == 0 || loader->n_contours == 0 )
1639  {
1640  loader->bbox.xMin = 0;
1641  loader->bbox.xMax = 0;
1642  loader->bbox.yMin = 0;
1643  loader->bbox.yMax = 0;
1644 
1645  error = tt_get_metrics( loader, glyph_index );
1646  if ( error )
1647  goto Exit;
1648 
1649  if ( header_only )
1650  goto Exit;
1651 
1652  /* must initialize points before (possibly) overriding */
1653  /* glyph metrics from the incremental interface */
1654  tt_loader_set_pp( loader );
1655 
1656 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1657  tt_get_metrics_incr_overrides( loader, glyph_index );
1658 #endif
1659 
1660 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1661 
1662  if ( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) ||
1663  FT_IS_VARIATION( FT_FACE( face ) ) )
1664  {
1665  /* a small outline structure with four elements for */
1666  /* communication with `TT_Vary_Apply_Glyph_Deltas' */
1667  FT_Vector points[4];
1668  char tags[4] = { 1, 1, 1, 1 };
1669  short contours[4] = { 0, 1, 2, 3 };
1670  FT_Outline outline;
1671 
1672 
1673  points[0].x = loader->pp1.x;
1674  points[0].y = loader->pp1.y;
1675  points[1].x = loader->pp2.x;
1676  points[1].y = loader->pp2.y;
1677 
1678  points[2].x = loader->pp3.x;
1679  points[2].y = loader->pp3.y;
1680  points[3].x = loader->pp4.x;
1681  points[3].y = loader->pp4.y;
1682 
1683  outline.n_points = 4;
1684  outline.n_contours = 4;
1685  outline.points = points;
1686  outline.tags = tags;
1687  outline.contours = contours;
1688 
1689  /* this must be done before scaling */
1690  error = TT_Vary_Apply_Glyph_Deltas( loader->face,
1691  glyph_index,
1692  &outline,
1693  (FT_UInt)outline.n_points );
1694  if ( error )
1695  goto Exit;
1696 
1697  loader->pp1.x = points[0].x;
1698  loader->pp1.y = points[0].y;
1699  loader->pp2.x = points[1].x;
1700  loader->pp2.y = points[1].y;
1701 
1702  loader->pp3.x = points[2].x;
1703  loader->pp3.y = points[2].y;
1704  loader->pp4.x = points[3].x;
1705  loader->pp4.y = points[3].y;
1706 
1707 
1708  /* recalculate linear horizontal and vertical advances */
1709  /* if we don't have HVAR and VVAR, respectively */
1710  if ( !( loader->face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) )
1711  loader->linear = loader->pp2.x - loader->pp1.x;
1712  if ( !( loader->face->variation_support & TT_FACE_FLAG_VAR_VADVANCE ) )
1713  loader->vadvance = loader->pp4.x - loader->pp3.x;
1714  }
1715 
1716 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
1717 
1718  /* scale phantom points, if necessary; */
1719  /* they get rounded in `TT_Hint_Glyph' */
1720  if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1721  {
1722  loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
1723  loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
1724  /* pp1.y and pp2.y are always zero */
1725 
1726  loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale );
1727  loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
1728  loader->pp4.x = FT_MulFix( loader->pp4.x, x_scale );
1729  loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
1730  }
1731 
1732  error = FT_Err_Ok;
1733  goto Exit;
1734  }
1735 
1736  /* must initialize phantom points before (possibly) overriding */
1737  /* glyph metrics from the incremental interface */
1738  tt_loader_set_pp( loader );
1739 
1740 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1741  tt_get_metrics_incr_overrides( loader, glyph_index );
1742 #endif
1743 
1744  /***********************************************************************/
1745  /***********************************************************************/
1746  /***********************************************************************/
1747 
1748  /* if it is a simple glyph, load it */
1749 
1750  if ( loader->n_contours > 0 )
1751  {
1752  error = face->read_simple_glyph( loader );
1753  if ( error )
1754  goto Exit;
1755 
1756  /* all data have been read */
1757  face->forget_glyph_frame( loader );
1758  opened_frame = 0;
1759 
1760  error = TT_Process_Simple_Glyph( loader );
1761  if ( error )
1762  goto Exit;
1763 
1764  FT_GlyphLoader_Add( gloader );
1765  }
1766 
1767  /***********************************************************************/
1768  /***********************************************************************/
1769  /***********************************************************************/
1770 
1771  /* otherwise, load a composite! */
1772  else if ( loader->n_contours < 0 )
1773  {
1774  FT_Memory memory = face->root.memory;
1775 
1776  FT_UInt start_point;
1777  FT_UInt start_contour;
1778  FT_ULong ins_pos; /* position of composite instructions, if any */
1779 
1780  FT_ListNode node, node2;
1781 
1782 
1783  /* normalize the `n_contours' value */
1784  loader->n_contours = -1;
1785 
1786  /*
1787  * We store the glyph index directly in the `node->data' pointer,
1788  * following the glib solution (cf. macro `GUINT_TO_POINTER') with a
1789  * double cast to make this portable. Note, however, that this needs
1790  * pointers with a width of at least 32 bits.
1791  */
1792 
1793 
1794  /* clear the nodes filled by sibling chains */
1795  node = ft_list_get_node_at( &loader->composites, recurse_count );
1796  for ( node2 = node; node2; node2 = node2->next )
1797  node2->data = (void*)FT_ULONG_MAX;
1798 
1799  /* check whether we already have a composite glyph with this index */
1800  if ( FT_List_Find( &loader->composites,
1801  FT_UINT_TO_POINTER( glyph_index ) ) )
1802  {
1803  FT_TRACE1(( "TT_Load_Composite_Glyph:"
1804  " infinite recursion detected\n" ));
1805  error = FT_THROW( Invalid_Composite );
1806  goto Exit;
1807  }
1808 
1809  else if ( node )
1810  node->data = FT_UINT_TO_POINTER( glyph_index );
1811 
1812  else
1813  {
1814  if ( FT_NEW( node ) )
1815  goto Exit;
1816  node->data = FT_UINT_TO_POINTER( glyph_index );
1817  FT_List_Add( &loader->composites, node );
1818  }
1819 
1820  start_point = (FT_UInt)gloader->base.outline.n_points;
1821  start_contour = (FT_UInt)gloader->base.outline.n_contours;
1822 
1823  /* for each subglyph, read composite header */
1824  error = face->read_composite_glyph( loader );
1825  if ( error )
1826  goto Exit;
1827 
1828  /* store the offset of instructions */
1829  ins_pos = loader->ins_pos;
1830 
1831  /* all data we need are read */
1832  face->forget_glyph_frame( loader );
1833  opened_frame = 0;
1834 
1835 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1836 
1837  if ( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) ||
1838  FT_IS_VARIATION( FT_FACE( face ) ) )
1839  {
1840  short i, limit;
1841  FT_SubGlyph subglyph;
1842 
1843  FT_Outline outline;
1844  FT_Vector* points = NULL;
1845  char* tags = NULL;
1846  short* contours = NULL;
1847 
1848 
1849  limit = (short)gloader->current.num_subglyphs;
1850 
1851  /* construct an outline structure for */
1852  /* communication with `TT_Vary_Apply_Glyph_Deltas' */
1853  outline.n_points = (short)( gloader->current.num_subglyphs + 4 );
1854  outline.n_contours = outline.n_points;
1855 
1856  outline.points = NULL;
1857  outline.tags = NULL;
1858  outline.contours = NULL;
1859 
1860  if ( FT_NEW_ARRAY( points, outline.n_points ) ||
1861  FT_NEW_ARRAY( tags, outline.n_points ) ||
1862  FT_NEW_ARRAY( contours, outline.n_points ) )
1863  goto Exit1;
1864 
1865  subglyph = gloader->current.subglyphs;
1866 
1867  for ( i = 0; i < limit; i++, subglyph++ )
1868  {
1869  /* applying deltas for anchor points doesn't make sense, */
1870  /* but we don't have to specially check this since */
1871  /* unused delta values are zero anyways */
1872  points[i].x = subglyph->arg1;
1873  points[i].y = subglyph->arg2;
1874  tags[i] = 1;
1875  contours[i] = i;
1876  }
1877 
1878  points[i].x = loader->pp1.x;
1879  points[i].y = loader->pp1.y;
1880  tags[i] = 1;
1881  contours[i] = i;
1882 
1883  i++;
1884  points[i].x = loader->pp2.x;
1885  points[i].y = loader->pp2.y;
1886  tags[i] = 1;
1887  contours[i] = i;
1888 
1889  i++;
1890  points[i].x = loader->pp3.x;
1891  points[i].y = loader->pp3.y;
1892  tags[i] = 1;
1893  contours[i] = i;
1894 
1895  i++;
1896  points[i].x = loader->pp4.x;
1897  points[i].y = loader->pp4.y;
1898  tags[i] = 1;
1899  contours[i] = i;
1900 
1901  outline.points = points;
1902  outline.tags = tags;
1903  outline.contours = contours;
1904 
1905  /* this call provides additional offsets */
1906  /* for each component's translation */
1907  if ( FT_SET_ERROR( TT_Vary_Apply_Glyph_Deltas(
1908  face,
1909  glyph_index,
1910  &outline,
1911  (FT_UInt)outline.n_points ) ) )
1912  goto Exit1;
1913 
1914  subglyph = gloader->current.subglyphs;
1915 
1916  for ( i = 0; i < limit; i++, subglyph++ )
1917  {
1918  if ( subglyph->flags & ARGS_ARE_XY_VALUES )
1919  {
1920  subglyph->arg1 = (FT_Int16)points[i].x;
1921  subglyph->arg2 = (FT_Int16)points[i].y;
1922  }
1923  }
1924 
1925  loader->pp1.x = points[i + 0].x;
1926  loader->pp1.y = points[i + 0].y;
1927  loader->pp2.x = points[i + 1].x;
1928  loader->pp2.y = points[i + 1].y;
1929 
1930  loader->pp3.x = points[i + 2].x;
1931  loader->pp3.y = points[i + 2].y;
1932  loader->pp4.x = points[i + 3].x;
1933  loader->pp4.y = points[i + 3].y;
1934 
1935  /* recalculate linear horizontal and vertical advances */
1936  /* if we don't have HVAR and VVAR, respectively */
1937  if ( !( face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) )
1938  loader->linear = loader->pp2.x - loader->pp1.x;
1939  if ( !( face->variation_support & TT_FACE_FLAG_VAR_VADVANCE ) )
1940  loader->vadvance = loader->pp4.x - loader->pp3.x;
1941 
1942  Exit1:
1943  FT_FREE( outline.points );
1944  FT_FREE( outline.tags );
1945  FT_FREE( outline.contours );
1946 
1947  if ( error )
1948  goto Exit;
1949  }
1950 
1951 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
1952 
1953  /* scale phantom points, if necessary; */
1954  /* they get rounded in `TT_Hint_Glyph' */
1955  if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1956  {
1957  loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
1958  loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
1959  /* pp1.y and pp2.y are always zero */
1960 
1961  loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale );
1962  loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
1963  loader->pp4.x = FT_MulFix( loader->pp4.x, x_scale );
1964  loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
1965  }
1966 
1967  /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */
1968  /* `as is' in the glyph slot (the client application will be */
1969  /* responsible for interpreting these data)... */
1970  if ( loader->load_flags & FT_LOAD_NO_RECURSE )
1971  {
1972  FT_GlyphLoader_Add( gloader );
1973  loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;
1974 
1975  goto Exit;
1976  }
1977 
1978  /*********************************************************************/
1979  /*********************************************************************/
1980  /*********************************************************************/
1981 
1982  {
1983  FT_UInt n, num_base_points;
1984  FT_SubGlyph subglyph = NULL;
1985 
1986  FT_UInt num_points = start_point;
1987  FT_UInt num_subglyphs = gloader->current.num_subglyphs;
1988  FT_UInt num_base_subgs = gloader->base.num_subglyphs;
1989 
1990  FT_Stream old_stream = loader->stream;
1991  FT_Int old_byte_len = loader->byte_len;
1992 
1993 
1994  FT_GlyphLoader_Add( gloader );
1995 
1996  /* read each subglyph independently */
1997  for ( n = 0; n < num_subglyphs; n++ )
1998  {
1999  FT_Vector pp[4];
2000 
2001  FT_Int linear_hadvance;
2002  FT_Int linear_vadvance;
2003 
2004 
2005  /* Each time we call load_truetype_glyph in this loop, the */
2006  /* value of `gloader.base.subglyphs' can change due to table */
2007  /* reallocations. We thus need to recompute the subglyph */
2008  /* pointer on each iteration. */
2009  subglyph = gloader->base.subglyphs + num_base_subgs + n;
2010 
2011  pp[0] = loader->pp1;
2012  pp[1] = loader->pp2;
2013  pp[2] = loader->pp3;
2014  pp[3] = loader->pp4;
2015 
2016  linear_hadvance = loader->linear;
2017  linear_vadvance = loader->vadvance;
2018 
2019  num_base_points = (FT_UInt)gloader->base.outline.n_points;
2020 
2021  error = load_truetype_glyph( loader,
2022  (FT_UInt)subglyph->index,
2023  recurse_count + 1,
2024  FALSE );
2025  if ( error )
2026  goto Exit;
2027 
2028  /* restore subglyph pointer */
2029  subglyph = gloader->base.subglyphs + num_base_subgs + n;
2030 
2031  /* restore phantom points if necessary */
2032  if ( !( subglyph->flags & USE_MY_METRICS ) )
2033  {
2034  loader->pp1 = pp[0];
2035  loader->pp2 = pp[1];
2036  loader->pp3 = pp[2];
2037  loader->pp4 = pp[3];
2038 
2039  loader->linear = linear_hadvance;
2040  loader->vadvance = linear_vadvance;
2041  }
2042 
2043  num_points = (FT_UInt)gloader->base.outline.n_points;
2044 
2045  if ( num_points == num_base_points )
2046  continue;
2047 
2048  /* gloader->base.outline consists of three parts: */
2049  /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */
2050  /* */
2051  /* (1): exists from the beginning */
2052  /* (2): components that have been loaded so far */
2053  /* (3): the newly loaded component */
2054  error = TT_Process_Composite_Component( loader,
2055  subglyph,
2056  start_point,
2057  num_base_points );
2058  if ( error )
2059  goto Exit;
2060  }
2061 
2062  loader->stream = old_stream;
2063  loader->byte_len = old_byte_len;
2064 
2065  /* process the glyph */
2066  loader->ins_pos = ins_pos;
2067  if ( IS_HINTED( loader->load_flags ) &&
2068 #ifdef TT_USE_BYTECODE_INTERPRETER
2069  subglyph->flags & WE_HAVE_INSTR &&
2070 #endif
2071  num_points > start_point )
2072  {
2073  error = TT_Process_Composite_Glyph( loader,
2074  start_point,
2075  start_contour );
2076  if ( error )
2077  goto Exit;
2078  }
2079  }
2080  }
2081 
2082  /***********************************************************************/
2083  /***********************************************************************/
2084  /***********************************************************************/
2085 
2086  Exit:
2087 
2088  if ( opened_frame )
2089  face->forget_glyph_frame( loader );
2090 
2091 #ifdef FT_CONFIG_OPTION_INCREMENTAL
2092 
2093  if ( glyph_data_loaded )
2094  face->root.internal->incremental_interface->funcs->free_glyph_data(
2095  face->root.internal->incremental_interface->object,
2096  &glyph_data );
2097 
2098 #endif
2099 
2100  return error;
2101  }
2102 
2103 
2104  static FT_Error
2105  compute_glyph_metrics( TT_Loader loader,
2106  FT_UInt glyph_index )
2107  {
2108  TT_Face face = loader->face;
2109 #if defined TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY || \
2110  defined TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
2111  TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );
2112 #endif
2113 
2114  FT_BBox bbox;
2115  FT_Fixed y_scale;
2116  TT_GlyphSlot glyph = loader->glyph;
2117  TT_Size size = loader->size;
2118 
2119 
2120  y_scale = 0x10000L;
2121  if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
2122  y_scale = size->metrics->y_scale;
2123 
2124  if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
2125  FT_Outline_Get_CBox( &glyph->outline, &bbox );
2126  else
2127  bbox = loader->bbox;
2128 
2129  /* get the device-independent horizontal advance; it is scaled later */
2130  /* by the base layer. */
2131  glyph->linearHoriAdvance = loader->linear;
2132 
2133  glyph->metrics.horiBearingX = bbox.xMin;
2134  glyph->metrics.horiBearingY = bbox.yMax;
2135  glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
2136 
2137  /* Adjust advance width to the value contained in the hdmx table */
2138  /* unless FT_LOAD_COMPUTE_METRICS is set or backward compatibility */
2139  /* mode of the v40 interpreter is active. See `ttinterp.h' for */
2140  /* details on backward compatibility mode. */
2141  if (
2142 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
2143  !( driver->interpreter_version == TT_INTERPRETER_VERSION_40 &&
2144  ( loader->exec && loader->exec->backward_compatibility ) ) &&
2145 #endif
2146  !face->postscript.isFixedPitch &&
2147  IS_HINTED( loader->load_flags ) &&
2148  !( loader->load_flags & FT_LOAD_COMPUTE_METRICS ) )
2149  {
2150  FT_Byte* widthp;
2151 
2152 
2153  widthp = tt_face_get_device_metrics( face,
2154  size->metrics->x_ppem,
2155  glyph_index );
2156 
2157 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
2158 
2159  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
2160  {
2161  FT_Bool ignore_x_mode;
2162 
2163 
2164  ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) !=
2165  FT_RENDER_MODE_MONO );
2166 
2167  if ( widthp &&
2168  ( ( ignore_x_mode && loader->exec->compatible_widths ) ||
2169  !ignore_x_mode ||
2170  SPH_OPTION_BITMAP_WIDTHS ) )
2171  glyph->metrics.horiAdvance = *widthp * 64;
2172  }
2173  else
2174 
2175 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
2176 
2177  {
2178  if ( widthp )
2179  glyph->metrics.horiAdvance = *widthp * 64;
2180  }
2181  }
2182 
2183  /* set glyph dimensions */
2184  glyph->metrics.width = SUB_LONG( bbox.xMax, bbox.xMin );
2185  glyph->metrics.height = SUB_LONG( bbox.yMax, bbox.yMin );
2186 
2187  /* Now take care of vertical metrics. In the case where there is */
2188  /* no vertical information within the font (relatively common), */
2189  /* create some metrics manually */
2190  {
2191  FT_Pos top; /* scaled vertical top side bearing */
2192  FT_Pos advance; /* scaled vertical advance height */
2193 
2194 
2195  /* Get the unscaled top bearing and advance height. */
2196  if ( face->vertical_info &&
2197  face->vertical.number_Of_VMetrics > 0 )
2198  {
2199  top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax,
2200  y_scale );
2201 
2202  if ( loader->pp3.y <= loader->pp4.y )
2203  advance = 0;
2204  else
2205  advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y,
2206  y_scale );
2207  }
2208  else
2209  {
2210  FT_Pos height;
2211 
2212 
2213  /* XXX Compute top side bearing and advance height in */
2214  /* Get_VMetrics instead of here. */
2215 
2216  /* NOTE: The OS/2 values are the only `portable' ones, */
2217  /* which is why we use them, if there is an OS/2 */
2218  /* table in the font. Otherwise, we use the */
2219  /* values defined in the horizontal header. */
2220 
2221  height = (FT_Short)FT_DivFix( SUB_LONG( bbox.yMax,
2222  bbox.yMin ),
2223  y_scale );
2224  if ( face->os2.version != 0xFFFFU )
2225  advance = (FT_Pos)( face->os2.sTypoAscender -
2226  face->os2.sTypoDescender );
2227  else
2228  advance = (FT_Pos)( face->horizontal.Ascender -
2229  face->horizontal.Descender );
2230 
2231  top = ( advance - height ) / 2;
2232  }
2233 
2234 #ifdef FT_CONFIG_OPTION_INCREMENTAL
2235  {
2236  FT_Incremental_InterfaceRec* incr;
2237  FT_Incremental_MetricsRec incr_metrics;
2238  FT_Error error;
2239 
2240 
2241  incr = face->root.internal->incremental_interface;
2242 
2243  /* If this is an incrementally loaded font see if there are */
2244  /* overriding metrics for this glyph. */
2245  if ( incr && incr->funcs->get_glyph_metrics )
2246  {
2247  incr_metrics.bearing_x = 0;
2248  incr_metrics.bearing_y = top;
2249  incr_metrics.advance = advance;
2250 
2251  error = incr->funcs->get_glyph_metrics( incr->object,
2252  glyph_index,
2253  TRUE,
2254  &incr_metrics );
2255  if ( error )
2256  return error;
2257 
2258  top = incr_metrics.bearing_y;
2259  advance = incr_metrics.advance;
2260  }
2261  }
2262 
2263  /* GWW: Do vertical metrics get loaded incrementally too? */
2264 
2265 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
2266 
2267  glyph->linearVertAdvance = advance;
2268 
2269  /* scale the metrics */
2270  if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
2271  {
2272  top = FT_MulFix( top, y_scale );
2273  advance = FT_MulFix( advance, y_scale );
2274  }
2275 
2276  /* XXX: for now, we have no better algorithm for the lsb, but it */
2277  /* should work fine. */
2278  /* */
2279  glyph->metrics.vertBearingX = glyph->metrics.horiBearingX -
2280  glyph->metrics.horiAdvance / 2;
2281  glyph->metrics.vertBearingY = top;
2282  glyph->metrics.vertAdvance = advance;
2283  }
2284 
2285  return 0;
2286  }
2287 
2288 
2289 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
2290 
2291  static FT_Error
2292  load_sbit_image( TT_Size size,
2293  TT_GlyphSlot glyph,
2294  FT_UInt glyph_index,
2295  FT_Int32 load_flags )
2296  {
2297  TT_Face face;
2298  SFNT_Service sfnt;
2299  FT_Stream stream;
2300  FT_Error error;
2301  TT_SBit_MetricsRec sbit_metrics;
2302 
2303 
2304  face = (TT_Face)glyph->face;
2305  sfnt = (SFNT_Service)face->sfnt;
2306  stream = face->root.stream;
2307 
2308  error = sfnt->load_sbit_image( face,
2309  size->strike_index,
2310  glyph_index,
2311  (FT_UInt)load_flags,
2312  stream,
2313  &glyph->bitmap,
2314  &sbit_metrics );
2315  if ( !error )
2316  {
2317  glyph->outline.n_points = 0;
2318  glyph->outline.n_contours = 0;
2319 
2320  glyph->metrics.width = (FT_Pos)sbit_metrics.width * 64;
2321  glyph->metrics.height = (FT_Pos)sbit_metrics.height * 64;
2322 
2323  glyph->metrics.horiBearingX = (FT_Pos)sbit_metrics.horiBearingX * 64;
2324  glyph->metrics.horiBearingY = (FT_Pos)sbit_metrics.horiBearingY * 64;
2325  glyph->metrics.horiAdvance = (FT_Pos)sbit_metrics.horiAdvance * 64;
2326 
2327  glyph->metrics.vertBearingX = (FT_Pos)sbit_metrics.vertBearingX * 64;
2328  glyph->metrics.vertBearingY = (FT_Pos)sbit_metrics.vertBearingY * 64;
2329  glyph->metrics.vertAdvance = (FT_Pos)sbit_metrics.vertAdvance * 64;
2330 
2331  glyph->format = FT_GLYPH_FORMAT_BITMAP;
2332 
2333  if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
2334  {
2335  glyph->bitmap_left = sbit_metrics.vertBearingX;
2336  glyph->bitmap_top = sbit_metrics.vertBearingY;
2337  }
2338  else
2339  {
2340  glyph->bitmap_left = sbit_metrics.horiBearingX;
2341  glyph->bitmap_top = sbit_metrics.horiBearingY;
2342  }
2343  }
2344 
2345  return error;
2346  }
2347 
2348 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
2349 
2350 
2351  static FT_Error
2352  tt_loader_init( TT_Loader loader,
2353  TT_Size size,
2354  TT_GlyphSlot glyph,
2355  FT_Int32 load_flags,
2356  FT_Bool glyf_table_only )
2357  {
2358  TT_Face face;
2359  FT_Stream stream;
2360 
2361 #ifdef TT_USE_BYTECODE_INTERPRETER
2362  FT_Error error;
2363  FT_Bool pedantic = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
2364 #if defined TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY || \
2365  defined TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
2366  TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( (TT_Face)glyph->face );
2367 #endif
2368 #endif
2369 
2370 
2371  face = (TT_Face)glyph->face;
2372  stream = face->root.stream;
2373 
2374  FT_ZERO( loader );
2375 
2376 #ifdef TT_USE_BYTECODE_INTERPRETER
2377 
2378  /* load execution context */
2379  if ( IS_HINTED( load_flags ) && !glyf_table_only )
2380  {
2381  TT_ExecContext exec;
2382  FT_Bool grayscale = TRUE;
2383 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
2384  FT_Bool subpixel_hinting_lean;
2385  FT_Bool grayscale_cleartype;
2386 #endif
2387 
2388 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
2389  FT_Bool subpixel_hinting = FALSE;
2390 
2391 #if 0
2392  /* not used yet */
2393  FT_Bool compatible_widths;
2394  FT_Bool symmetrical_smoothing;
2395  FT_Bool bgr;
2396  FT_Bool vertical_lcd;
2397  FT_Bool subpixel_positioned;
2398  FT_Bool gray_cleartype;
2399 #endif
2400 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
2401 
2402  FT_Bool reexecute = FALSE;
2403 
2404 
2405  if ( size->bytecode_ready < 0 || size->cvt_ready < 0 )
2406  {
2407  error = tt_size_ready_bytecode( size, pedantic );
2408  if ( error )
2409  return error;
2410  }
2411  else if ( size->bytecode_ready )
2412  return size->bytecode_ready;
2413  else if ( size->cvt_ready )
2414  return size->cvt_ready;
2415 
2416  /* query new execution context */
2417  exec = size->context;
2418  if ( !exec )
2419  return FT_THROW( Could_Not_Find_Context );
2420 
2421 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
2422  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 )
2423  {
2424  subpixel_hinting_lean =
2425  FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2426  FT_RENDER_MODE_MONO );
2427  grayscale_cleartype =
2428  FT_BOOL( subpixel_hinting_lean &&
2429  !( ( load_flags &
2430  FT_LOAD_TARGET_LCD ) ||
2431  ( load_flags &
2432  FT_LOAD_TARGET_LCD_V ) ) );
2433  exec->vertical_lcd_lean =
2434  FT_BOOL( subpixel_hinting_lean &&
2435  ( load_flags &
2436  FT_LOAD_TARGET_LCD_V ) );
2437  }
2438  else
2439  {
2440  subpixel_hinting_lean = FALSE;
2441  grayscale_cleartype = FALSE;
2442  exec->vertical_lcd_lean = FALSE;
2443  }
2444 #endif
2445 
2446 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
2447 
2448  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
2449  {
2450  subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags ) !=
2451  FT_RENDER_MODE_MONO ) &&
2452  SPH_OPTION_SET_SUBPIXEL );
2453 
2454  if ( subpixel_hinting )
2455  grayscale = FALSE;
2456  else if ( SPH_OPTION_SET_GRAYSCALE )
2457  {
2458  grayscale = TRUE;
2459  subpixel_hinting = FALSE;
2460  }
2461  else
2462  grayscale = FALSE;
2463 
2464  if ( FT_IS_TRICKY( glyph->face ) )
2465  subpixel_hinting = FALSE;
2466 
2467  exec->ignore_x_mode = subpixel_hinting || grayscale;
2468  exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
2469  if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )
2470  exec->rasterizer_version = TT_INTERPRETER_VERSION_35;
2471 
2472 #if 1
2473  exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS;
2474  exec->symmetrical_smoothing = TRUE;
2475  exec->bgr = FALSE;
2476  exec->vertical_lcd = FALSE;
2477  exec->subpixel_positioned = TRUE;
2478  exec->gray_cleartype = FALSE;
2479 #else /* 0 */
2480  exec->compatible_widths =
2481  FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2482  TT_LOAD_COMPATIBLE_WIDTHS );
2483  exec->symmetrical_smoothing =
2484  FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2485  TT_LOAD_SYMMETRICAL_SMOOTHING );
2486  exec->bgr =
2487  FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2488  TT_LOAD_BGR );
2489  exec->vertical_lcd =
2490  FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2491  TT_LOAD_VERTICAL_LCD );
2492  exec->subpixel_positioned =
2493  FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2494  TT_LOAD_SUBPIXEL_POSITIONED );
2495  exec->gray_cleartype =
2496  FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2497  TT_LOAD_GRAY_CLEARTYPE );
2498 #endif /* 0 */
2499 
2500  }
2501  else
2502 
2503 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
2504 
2505 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
2506  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 )
2507  grayscale = FT_BOOL( !subpixel_hinting_lean &&
2508  FT_LOAD_TARGET_MODE( load_flags ) !=
2509  FT_RENDER_MODE_MONO );
2510  else
2511 #endif
2512  grayscale = FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
2513  FT_RENDER_MODE_MONO );
2514 
2515  error = TT_Load_Context( exec, face, size );
2516  if ( error )
2517  return error;
2518 
2519 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
2520 
2521  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
2522  {
2523  /* a change from mono to subpixel rendering (and vice versa) */
2524  /* requires a re-execution of the CVT program */
2525  if ( subpixel_hinting != exec->subpixel_hinting )
2526  {
2527  FT_TRACE4(( "tt_loader_init: subpixel hinting change,"
2528  " re-executing `prep' table\n" ));
2529 
2530  exec->subpixel_hinting = subpixel_hinting;
2531  reexecute = TRUE;
2532  }
2533 
2534  /* a change from mono to grayscale rendering (and vice versa) */
2535  /* requires a re-execution of the CVT program */
2536  if ( grayscale != exec->grayscale )
2537  {
2538  FT_TRACE4(( "tt_loader_init: grayscale hinting change,"
2539  " re-executing `prep' table\n" ));
2540 
2541  exec->grayscale = grayscale;
2542  reexecute = TRUE;
2543  }
2544  }
2545  else
2546 
2547 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
2548 
2549  {
2550 
2551 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
2552  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 )
2553  {
2554  /* a change from mono to subpixel rendering (and vice versa) */
2555  /* requires a re-execution of the CVT program */
2556  if ( subpixel_hinting_lean != exec->subpixel_hinting_lean )
2557  {
2558  FT_TRACE4(( "tt_loader_init: subpixel hinting change,"
2559  " re-executing `prep' table\n" ));
2560 
2561  exec->subpixel_hinting_lean = subpixel_hinting_lean;
2562  reexecute = TRUE;
2563  }
2564 
2565  /* a change from colored to grayscale subpixel rendering (and */
2566  /* vice versa) requires a re-execution of the CVT program */
2567  if ( grayscale_cleartype != exec->grayscale_cleartype )
2568  {
2569  FT_TRACE4(( "tt_loader_init: grayscale subpixel hinting change,"
2570  " re-executing `prep' table\n" ));
2571 
2572  exec->grayscale_cleartype = grayscale_cleartype;
2573  reexecute = TRUE;
2574  }
2575  }
2576 #endif
2577 
2578  /* a change from mono to grayscale rendering (and vice versa) */
2579  /* requires a re-execution of the CVT program */
2580  if ( grayscale != exec->grayscale )
2581  {
2582  FT_TRACE4(( "tt_loader_init: grayscale hinting change,"
2583  " re-executing `prep' table\n" ));
2584 
2585  exec->grayscale = grayscale;
2586  reexecute = TRUE;
2587  }
2588  }
2589 
2590  if ( reexecute )
2591  {
2592  FT_UInt i;
2593 
2594 
2595  for ( i = 0; i < size->cvt_size; i++ )
2596  size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
2597  error = tt_size_run_prep( size, pedantic );
2598  if ( error )
2599  return error;
2600  }
2601 
2602  /* check whether the cvt program has disabled hinting */
2603  if ( exec->GS.instruct_control & 1 )
2604  load_flags |= FT_LOAD_NO_HINTING;
2605 
2606  /* load default graphics state -- if needed */
2607  if ( exec->GS.instruct_control & 2 )
2608  exec->GS = tt_default_graphics_state;
2609 
2610 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
2611  /* check whether we have a font hinted for ClearType -- */
2612  /* note that this flag can also be modified in a glyph's bytecode */
2613  if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 &&
2614  exec->GS.instruct_control & 4 )
2615  exec->ignore_x_mode = 0;
2616 #endif
2617 
2618  exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
2619  loader->exec = exec;
2620  loader->instructions = exec->glyphIns;
2621  }
2622 
2623 #endif /* TT_USE_BYTECODE_INTERPRETER */
2624 
2625  /* get face's glyph loader */
2626  if ( !glyf_table_only )
2627  {
2628  FT_GlyphLoader gloader = glyph->internal->loader;
2629 
2630 
2631  FT_GlyphLoader_Rewind( gloader );
2632  loader->gloader = gloader;
2633  }
2634 
2635  loader->load_flags = (FT_ULong)load_flags;
2636 
2637  loader->face = face;
2638  loader->size = size;
2639  loader->glyph = (FT_GlyphSlot)glyph;
2640  loader->stream = stream;
2641 
2642  loader->composites.head = NULL;
2643  loader->composites.tail = NULL;
2644 
2645  return FT_Err_Ok;
2646  }
2647 
2648 
2649  static void
2650  tt_loader_done( TT_Loader loader )
2651  {
2652  FT_List_Finalize( &loader->composites,
2653  NULL,
2654  loader->face->root.memory,
2655  NULL );
2656  }
2657 
2658 
2659  /*************************************************************************/
2660  /* */
2661  /* <Function> */
2662  /* TT_Load_Glyph */
2663  /* */
2664  /* <Description> */
2665  /* A function used to load a single glyph within a given glyph slot, */
2666  /* for a given size. */
2667  /* */
2668  /* <Input> */
2669  /* glyph :: A handle to a target slot object where the glyph */
2670  /* will be loaded. */
2671  /* */
2672  /* size :: A handle to the source face size at which the glyph */
2673  /* must be scaled/loaded. */
2674  /* */
2675  /* glyph_index :: The index of the glyph in the font file. */
2676  /* */
2677  /* load_flags :: A flag indicating what to load for this glyph. The */
2678  /* FT_LOAD_XXX constants can be used to control the */
2679  /* glyph loading process (e.g., whether the outline */
2680  /* should be scaled, whether to load bitmaps or not, */
2681  /* whether to hint the outline, etc). */
2682  /* */
2683  /* <Return> */
2684  /* FreeType error code. 0 means success. */
2685  /* */
2686  FT_LOCAL_DEF( FT_Error )
2687  TT_Load_Glyph( TT_Size size,
2688  TT_GlyphSlot glyph,
2689  FT_UInt glyph_index,
2690  FT_Int32 load_flags )
2691  {
2692  FT_Error error;
2693  TT_LoaderRec loader;
2694 
2695 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
2696 #define IS_DEFAULT_INSTANCE ( !( FT_IS_NAMED_INSTANCE( glyph->face ) || \
2697  FT_IS_VARIATION( glyph->face ) ) )
2698 #else
2699 #define IS_DEFAULT_INSTANCE 1
2700 #endif
2701 
2702 
2703  FT_TRACE1(( "TT_Load_Glyph: glyph index %d\n", glyph_index ));
2704 
2705 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
2706 
2707  /* try to load embedded bitmap (if any) */
2708  if ( size->strike_index != 0xFFFFFFFFUL &&
2709  ( load_flags & FT_LOAD_NO_BITMAP ) == 0 &&
2710  IS_DEFAULT_INSTANCE )
2711  {
2712  error = load_sbit_image( size, glyph, glyph_index, load_flags );
2713  if ( FT_ERR_EQ( error, Missing_Bitmap ) )
2714  {
2715  /* the bitmap strike is incomplete and misses the requested glyph; */
2716  /* if we have a bitmap-only font, return an empty glyph */
2717  if ( !FT_IS_SCALABLE( glyph->face ) )
2718  {
2719  TT_Face face = (TT_Face)glyph->face;
2720  FT_Short left_bearing = 0, top_bearing = 0;
2721  FT_UShort advance_width = 0, advance_height = 0;
2722 
2723 
2724  /* to return an empty glyph, however, we need metrics data */
2725  /* from the `hmtx' (or `vmtx') table; the assumption is that */
2726  /* empty glyphs are missing intentionally, representing */
2727  /* whitespace - not having at least horizontal metrics is */
2728  /* thus considered an error */
2729  if ( !face->horz_metrics_size )
2730  return error;
2731 
2732  /* we now construct an empty bitmap glyph */
2733  TT_Get_HMetrics( face, glyph_index,
2734  &left_bearing,
2735  &advance_width );
2736  TT_Get_VMetrics( face, glyph_index,
2737  0,
2738  &top_bearing,
2739  &advance_height );
2740 
2741  glyph->outline.n_points = 0;
2742  glyph->outline.n_contours = 0;
2743 
2744  glyph->metrics.width = 0;
2745  glyph->metrics.height = 0;
2746 
2747  glyph->metrics.horiBearingX = left_bearing;
2748  glyph->metrics.horiBearingY = 0;
2749  glyph->metrics.horiAdvance = advance_width;
2750 
2751  glyph->metrics.vertBearingX = 0;
2752  glyph->metrics.vertBearingY = top_bearing;
2753  glyph->metrics.vertAdvance = advance_height;
2754 
2755  glyph->format = FT_GLYPH_FORMAT_BITMAP;
2756  glyph->bitmap.pixel_mode = FT_PIXEL_MODE_MONO;
2757 
2758  glyph->bitmap_left = 0;
2759  glyph->bitmap_top = 0;
2760 
2761  return FT_Err_Ok;
2762  }
2763  }
2764  else if ( error )
2765  {
2766  /* return error if font is not scalable */
2767  if ( !FT_IS_SCALABLE( glyph->face ) )
2768  return error;
2769  }
2770  else
2771  {
2772  if ( FT_IS_SCALABLE( glyph->face ) )
2773  {
2774  /* for the bbox we need the header only */
2775  (void)tt_loader_init( &loader, size, glyph, load_flags, TRUE );
2776  (void)load_truetype_glyph( &loader, glyph_index, 0, TRUE );
2777  tt_loader_done( &loader );
2778  glyph->linearHoriAdvance = loader.linear;
2779  glyph->linearVertAdvance = loader.vadvance;
2780 
2781  /* sanity checks: if `xxxAdvance' in the sbit metric */
2782  /* structure isn't set, use `linearXXXAdvance' */
2783  if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance )
2784  glyph->metrics.horiAdvance =
2785  FT_MulFix( glyph->linearHoriAdvance,
2786  size->metrics->x_scale );
2787  if ( !glyph->metrics.vertAdvance && glyph->linearVertAdvance )
2788  glyph->metrics.vertAdvance =
2789  FT_MulFix( glyph->linearVertAdvance,
2790  size->metrics->y_scale );
2791  }
2792 
2793  return FT_Err_Ok;
2794  }
2795  }
2796 
2797 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
2798 
2799  /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */
2800  if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid )
2801  {
2802  error = FT_THROW( Invalid_Size_Handle );
2803  goto Exit;
2804  }
2805 
2806  if ( load_flags & FT_LOAD_SBITS_ONLY )
2807  {
2808  error = FT_THROW( Invalid_Argument );
2809  goto Exit;
2810  }
2811 
2812  error = tt_loader_init( &loader, size, glyph, load_flags, FALSE );
2813  if ( error )
2814  goto Exit;
2815 
2816  glyph->format = FT_GLYPH_FORMAT_OUTLINE;
2817  glyph->num_subglyphs = 0;
2818  glyph->outline.flags = 0;
2819 
2820  /* main loading loop */
2821  error = load_truetype_glyph( &loader, glyph_index, 0, FALSE );
2822  if ( !error )
2823  {
2824  if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE )
2825  {
2826  glyph->num_subglyphs = loader.gloader->base.num_subglyphs;
2827  glyph->subglyphs = loader.gloader->base.subglyphs;
2828  }
2829  else
2830  {
2831  glyph->outline = loader.gloader->base.outline;
2832  glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS;
2833 
2834  /* Translate array so that (0,0) is the glyph's origin. Note */
2835  /* that this behaviour is independent on the value of bit 1 of */
2836  /* the `flags' field in the `head' table -- at least major */
2837  /* applications like Acroread indicate that. */
2838  if ( loader.pp1.x )
2839  FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 );
2840  }
2841 
2842 #ifdef TT_USE_BYTECODE_INTERPRETER
2843 
2844  if ( IS_HINTED( load_flags ) )
2845  {
2846  if ( loader.exec->GS.scan_control )
2847  {
2848  /* convert scan conversion mode to FT_OUTLINE_XXX flags */
2849  switch ( loader.exec->GS.scan_type )
2850  {
2851  case 0: /* simple drop-outs including stubs */
2852  glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS;
2853  break;
2854  case 1: /* simple drop-outs excluding stubs */
2855  /* nothing; it's the default rendering mode */
2856  break;
2857  case 4: /* smart drop-outs including stubs */
2858  glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS |
2859  FT_OUTLINE_INCLUDE_STUBS;
2860  break;
2861  case 5: /* smart drop-outs excluding stubs */
2862  glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS;
2863  break;
2864 
2865  default: /* no drop-out control */
2866  glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
2867  break;
2868  }
2869  }
2870  else
2871  glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
2872  }
2873 
2874 #endif /* TT_USE_BYTECODE_INTERPRETER */
2875 
2876  error = compute_glyph_metrics( &loader, glyph_index );
2877  }
2878 
2879  tt_loader_done( &loader );
2880 
2881  /* Set the `high precision' bit flag. */
2882  /* This is _critical_ to get correct output for monochrome */
2883  /* TrueType glyphs at all sizes using the bytecode interpreter. */
2884  /* */
2885  if ( !( load_flags & FT_LOAD_NO_SCALE ) &&
2886  size->metrics->y_ppem < 24 )
2887  glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
2888 
2889  Exit:
2890 #ifdef FT_DEBUG_LEVEL_TRACE
2891  if ( error )
2892  FT_TRACE1(( " failed (error code 0x%x)\n",
2893  error ));
2894 #endif
2895 
2896  return error;
2897  }
2898 
2899 
2900 /* END */
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Definition: freetype.h:554
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Definition: ttgload.c:1510
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Definition: freetype.h:1933
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Definition: ftdebug.h:162
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Definition: ftstream.h:512
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Definition: ke_i.h:80
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Definition: ftcalc.h:422
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Definition: ftmemory.h:228
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Definition: ttinterp.h:192
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Definition: ftstream.h:223
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Definition: freetype.h:3012
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Definition: ttgload.c:262
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Definition: fttypes.h:388
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Definition: fttypes.h:388
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static FT_ListNode ft_list_get_node_at(FT_List list, FT_UInt idx)
Definition: ttgload.c:1479
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Definition: ttgload.c:2687
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Definition: ftgloadr.h:39
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Definition: glext.h:8902
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Definition: fttypes.h:209
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Definition: ftgloadr.h:118
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Definition: tttypes.h:1643
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static FT_Error tt_loader_init(TT_Loader loader, TT_Size size, TT_GlyphSlot glyph, FT_Int32 load_flags, FT_Bool glyf_table_only)
Definition: ttgload.c:2352
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Arabic default style
Definition: afstyles.h:93
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Definition: freetype.h:1312
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Definition: ftcalc.c:155
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Definition: ttinterp.h:230
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Definition: tttypes.h:1651
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Definition: ttpload.c:195
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Definition: linux.c:32
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Definition: ttinterp.h:193
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Definition: tttypes.h:1391
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Definition: ttgload.c:781
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