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[reactos.git] / lib / 3rdparty / freetype / src / truetype / ttobjs.c
1 /***************************************************************************/
2 /* */
3 /* ttobjs.c */
4 /* */
5 /* Objects manager (body). */
6 /* */
7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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_INTERNAL_STREAM_H
22 #include FT_TRUETYPE_TAGS_H
23 #include FT_INTERNAL_SFNT_H
24
25 #include "ttgload.h"
26 #include "ttpload.h"
27
28 #include "tterrors.h"
29
30 #ifdef TT_USE_BYTECODE_INTERPRETER
31 #include "ttinterp.h"
32 #endif
33
34 #ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
35 #include FT_TRUETYPE_UNPATENTED_H
36 #endif
37
38 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
39 #include "ttgxvar.h"
40 #endif
41
42 /*************************************************************************/
43 /* */
44 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
45 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
46 /* messages during execution. */
47 /* */
48 #undef FT_COMPONENT
49 #define FT_COMPONENT trace_ttobjs
50
51
52 #ifdef TT_USE_BYTECODE_INTERPRETER
53
54 /*************************************************************************/
55 /* */
56 /* GLYPH ZONE FUNCTIONS */
57 /* */
58 /*************************************************************************/
59
60
61 /*************************************************************************/
62 /* */
63 /* <Function> */
64 /* tt_glyphzone_done */
65 /* */
66 /* <Description> */
67 /* Deallocate a glyph zone. */
68 /* */
69 /* <Input> */
70 /* zone :: A pointer to the target glyph zone. */
71 /* */
72 FT_LOCAL_DEF( void )
73 tt_glyphzone_done( TT_GlyphZone zone )
74 {
75 FT_Memory memory = zone->memory;
76
77
78 if ( memory )
79 {
80 FT_FREE( zone->contours );
81 FT_FREE( zone->tags );
82 FT_FREE( zone->cur );
83 FT_FREE( zone->org );
84 FT_FREE( zone->orus );
85
86 zone->max_points = zone->n_points = 0;
87 zone->max_contours = zone->n_contours = 0;
88 zone->memory = NULL;
89 }
90 }
91
92
93 /*************************************************************************/
94 /* */
95 /* <Function> */
96 /* tt_glyphzone_new */
97 /* */
98 /* <Description> */
99 /* Allocate a new glyph zone. */
100 /* */
101 /* <Input> */
102 /* memory :: A handle to the current memory object. */
103 /* */
104 /* maxPoints :: The capacity of glyph zone in points. */
105 /* */
106 /* maxContours :: The capacity of glyph zone in contours. */
107 /* */
108 /* <Output> */
109 /* zone :: A pointer to the target glyph zone record. */
110 /* */
111 /* <Return> */
112 /* FreeType error code. 0 means success. */
113 /* */
114 FT_LOCAL_DEF( FT_Error )
115 tt_glyphzone_new( FT_Memory memory,
116 FT_UShort maxPoints,
117 FT_Short maxContours,
118 TT_GlyphZone zone )
119 {
120 FT_Error error;
121
122
123 FT_MEM_ZERO( zone, sizeof ( *zone ) );
124 zone->memory = memory;
125
126 if ( FT_NEW_ARRAY( zone->org, maxPoints ) ||
127 FT_NEW_ARRAY( zone->cur, maxPoints ) ||
128 FT_NEW_ARRAY( zone->orus, maxPoints ) ||
129 FT_NEW_ARRAY( zone->tags, maxPoints ) ||
130 FT_NEW_ARRAY( zone->contours, maxContours ) )
131 {
132 tt_glyphzone_done( zone );
133 }
134 else
135 {
136 zone->max_points = maxPoints;
137 zone->max_contours = maxContours;
138 }
139
140 return error;
141 }
142 #endif /* TT_USE_BYTECODE_INTERPRETER */
143
144
145 /* Compare the face with a list of well-known `tricky' fonts. */
146 /* This list shall be expanded as we find more of them. */
147
148 static FT_Bool
149 tt_check_trickyness( FT_String* name )
150 {
151 #define TRICK_NAMES_MAX_CHARACTERS 16
152 #define TRICK_NAMES_COUNT 7
153 static const char trick_names[TRICK_NAMES_COUNT][TRICK_NAMES_MAX_CHARACTERS+1] =
154 {
155 "DFKaiSho-SB", /* dfkaisb.ttf */
156 "DFKaiShu",
157 "DFKai-SB", /* kaiu.ttf */
158 "HuaTianSongTi?", /* htst3.ttf */
159 "MingLiU", /* mingliu.ttf & mingliu.ttc */
160 "PMingLiU", /* mingliu.ttc */
161 "MingLi43", /* mingli.ttf */
162 };
163 int nn;
164
165
166 if ( !name )
167 return FALSE;
168
169 /* Note that we only check the face name at the moment; it might */
170 /* be worth to do more checks for a few special cases. */
171 for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ )
172 if ( ft_strstr( name, trick_names[nn] ) )
173 return TRUE;
174
175 return FALSE;
176 }
177
178
179 /*************************************************************************/
180 /* */
181 /* <Function> */
182 /* tt_face_init */
183 /* */
184 /* <Description> */
185 /* Initialize a given TrueType face object. */
186 /* */
187 /* <Input> */
188 /* stream :: The source font stream. */
189 /* */
190 /* face_index :: The index of the font face in the resource. */
191 /* */
192 /* num_params :: Number of additional generic parameters. Ignored. */
193 /* */
194 /* params :: Additional generic parameters. Ignored. */
195 /* */
196 /* <InOut> */
197 /* face :: The newly built face object. */
198 /* */
199 /* <Return> */
200 /* FreeType error code. 0 means success. */
201 /* */
202 FT_LOCAL_DEF( FT_Error )
203 tt_face_init( FT_Stream stream,
204 FT_Face ttface, /* TT_Face */
205 FT_Int face_index,
206 FT_Int num_params,
207 FT_Parameter* params )
208 {
209 FT_Error error;
210 FT_Library library;
211 SFNT_Service sfnt;
212 TT_Face face = (TT_Face)ttface;
213
214
215 library = ttface->driver->root.library;
216 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
217 if ( !sfnt )
218 goto Bad_Format;
219
220 /* create input stream from resource */
221 if ( FT_STREAM_SEEK( 0 ) )
222 goto Exit;
223
224 /* check that we have a valid TrueType file */
225 error = sfnt->init_face( stream, face, face_index, num_params, params );
226 if ( error )
227 goto Exit;
228
229 /* We must also be able to accept Mac/GX fonts, as well as OT ones. */
230 /* The 0x00020000 tag is completely undocumented; some fonts from */
231 /* Arphic made for Chinese Windows 3.1 have this. */
232 if ( face->format_tag != 0x00010000L && /* MS fonts */
233 face->format_tag != 0x00020000L && /* CJK fonts for Win 3.1 */
234 face->format_tag != TTAG_true ) /* Mac fonts */
235 {
236 FT_TRACE2(( "[not a valid TTF font]\n" ));
237 goto Bad_Format;
238 }
239
240 #ifdef TT_USE_BYTECODE_INTERPRETER
241 ttface->face_flags |= FT_FACE_FLAG_HINTER;
242 #endif
243
244 /* If we are performing a simple font format check, exit immediately. */
245 if ( face_index < 0 )
246 return TT_Err_Ok;
247
248 /* Load font directory */
249 error = sfnt->load_face( stream, face, face_index, num_params, params );
250 if ( error )
251 goto Exit;
252
253 if ( tt_check_trickyness( ttface->family_name ) )
254 ttface->face_flags |= FT_FACE_FLAG_TRICKY;
255
256 error = tt_face_load_hdmx( face, stream );
257 if ( error )
258 goto Exit;
259
260 if ( FT_IS_SCALABLE( ttface ) )
261 {
262
263 #ifdef FT_CONFIG_OPTION_INCREMENTAL
264
265 if ( !ttface->internal->incremental_interface )
266 error = tt_face_load_loca( face, stream );
267 if ( !error )
268 error = tt_face_load_cvt( face, stream );
269 if ( !error )
270 error = tt_face_load_fpgm( face, stream );
271 if ( !error )
272 error = tt_face_load_prep( face, stream );
273
274 #else
275
276 if ( !error )
277 error = tt_face_load_loca( face, stream );
278 if ( !error )
279 error = tt_face_load_cvt( face, stream );
280 if ( !error )
281 error = tt_face_load_fpgm( face, stream );
282 if ( !error )
283 error = tt_face_load_prep( face, stream );
284
285 #endif
286
287 }
288
289 #if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING ) && \
290 !defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER )
291
292 {
293 FT_Bool unpatented_hinting;
294 int i;
295
296
297 /* Determine whether unpatented hinting is to be used for this face. */
298 unpatented_hinting = FT_BOOL
299 ( library->debug_hooks[FT_DEBUG_HOOK_UNPATENTED_HINTING] != NULL );
300
301 for ( i = 0; i < num_params && !face->unpatented_hinting; i++ )
302 if ( params[i].tag == FT_PARAM_TAG_UNPATENTED_HINTING )
303 unpatented_hinting = TRUE;
304
305 if ( !unpatented_hinting )
306 ttface->internal->ignore_unpatented_hinter = TRUE;
307 }
308
309 #endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING &&
310 !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
311
312 /* initialize standard glyph loading routines */
313 TT_Init_Glyph_Loading( face );
314
315 Exit:
316 return error;
317
318 Bad_Format:
319 error = TT_Err_Unknown_File_Format;
320 goto Exit;
321 }
322
323
324 /*************************************************************************/
325 /* */
326 /* <Function> */
327 /* tt_face_done */
328 /* */
329 /* <Description> */
330 /* Finalize a given face object. */
331 /* */
332 /* <Input> */
333 /* face :: A pointer to the face object to destroy. */
334 /* */
335 FT_LOCAL_DEF( void )
336 tt_face_done( FT_Face ttface ) /* TT_Face */
337 {
338 TT_Face face = (TT_Face)ttface;
339 FT_Memory memory;
340 FT_Stream stream;
341 SFNT_Service sfnt;
342
343
344 if ( !face )
345 return;
346
347 memory = ttface->memory;
348 stream = ttface->stream;
349 sfnt = (SFNT_Service)face->sfnt;
350
351 /* for `extended TrueType formats' (i.e. compressed versions) */
352 if ( face->extra.finalizer )
353 face->extra.finalizer( face->extra.data );
354
355 if ( sfnt )
356 sfnt->done_face( face );
357
358 /* freeing the locations table */
359 tt_face_done_loca( face );
360
361 tt_face_free_hdmx( face );
362
363 /* freeing the CVT */
364 FT_FREE( face->cvt );
365 face->cvt_size = 0;
366
367 /* freeing the programs */
368 FT_FRAME_RELEASE( face->font_program );
369 FT_FRAME_RELEASE( face->cvt_program );
370 face->font_program_size = 0;
371 face->cvt_program_size = 0;
372
373 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
374 tt_done_blend( memory, face->blend );
375 face->blend = NULL;
376 #endif
377 }
378
379
380 /*************************************************************************/
381 /* */
382 /* SIZE FUNCTIONS */
383 /* */
384 /*************************************************************************/
385
386 #ifdef TT_USE_BYTECODE_INTERPRETER
387
388 /*************************************************************************/
389 /* */
390 /* <Function> */
391 /* tt_size_run_fpgm */
392 /* */
393 /* <Description> */
394 /* Run the font program. */
395 /* */
396 /* <Input> */
397 /* size :: A handle to the size object. */
398 /* */
399 /* <Return> */
400 /* FreeType error code. 0 means success. */
401 /* */
402 FT_LOCAL_DEF( FT_Error )
403 tt_size_run_fpgm( TT_Size size )
404 {
405 TT_Face face = (TT_Face)size->root.face;
406 TT_ExecContext exec;
407 FT_Error error;
408
409
410 /* debugging instances have their own context */
411 if ( size->debug )
412 exec = size->context;
413 else
414 exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
415
416 if ( !exec )
417 return TT_Err_Could_Not_Find_Context;
418
419 TT_Load_Context( exec, face, size );
420
421 exec->callTop = 0;
422 exec->top = 0;
423
424 exec->period = 64;
425 exec->phase = 0;
426 exec->threshold = 0;
427
428 exec->instruction_trap = FALSE;
429 exec->F_dot_P = 0x10000L;
430
431 {
432 FT_Size_Metrics* metrics = &exec->metrics;
433 TT_Size_Metrics* tt_metrics = &exec->tt_metrics;
434
435
436 metrics->x_ppem = 0;
437 metrics->y_ppem = 0;
438 metrics->x_scale = 0;
439 metrics->y_scale = 0;
440
441 tt_metrics->ppem = 0;
442 tt_metrics->scale = 0;
443 tt_metrics->ratio = 0x10000L;
444 }
445
446 /* allow font program execution */
447 TT_Set_CodeRange( exec,
448 tt_coderange_font,
449 face->font_program,
450 face->font_program_size );
451
452 /* disable CVT and glyph programs coderange */
453 TT_Clear_CodeRange( exec, tt_coderange_cvt );
454 TT_Clear_CodeRange( exec, tt_coderange_glyph );
455
456 if ( face->font_program_size > 0 )
457 {
458 error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 );
459
460 if ( !error )
461 error = face->interpreter( exec );
462 }
463 else
464 error = TT_Err_Ok;
465
466 if ( !error )
467 TT_Save_Context( exec, size );
468
469 return error;
470 }
471
472
473 /*************************************************************************/
474 /* */
475 /* <Function> */
476 /* tt_size_run_prep */
477 /* */
478 /* <Description> */
479 /* Run the control value program. */
480 /* */
481 /* <Input> */
482 /* size :: A handle to the size object. */
483 /* */
484 /* <Return> */
485 /* FreeType error code. 0 means success. */
486 /* */
487 FT_LOCAL_DEF( FT_Error )
488 tt_size_run_prep( TT_Size size )
489 {
490 TT_Face face = (TT_Face)size->root.face;
491 TT_ExecContext exec;
492 FT_Error error;
493
494
495 /* debugging instances have their own context */
496 if ( size->debug )
497 exec = size->context;
498 else
499 exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
500
501 if ( !exec )
502 return TT_Err_Could_Not_Find_Context;
503
504 TT_Load_Context( exec, face, size );
505
506 exec->callTop = 0;
507 exec->top = 0;
508
509 exec->instruction_trap = FALSE;
510
511 TT_Set_CodeRange( exec,
512 tt_coderange_cvt,
513 face->cvt_program,
514 face->cvt_program_size );
515
516 TT_Clear_CodeRange( exec, tt_coderange_glyph );
517
518 if ( face->cvt_program_size > 0 )
519 {
520 error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 );
521
522 if ( !error && !size->debug )
523 error = face->interpreter( exec );
524 }
525 else
526 error = TT_Err_Ok;
527
528 /* save as default graphics state */
529 size->GS = exec->GS;
530
531 TT_Save_Context( exec, size );
532
533 return error;
534 }
535
536 #endif /* TT_USE_BYTECODE_INTERPRETER */
537
538
539 #ifdef TT_USE_BYTECODE_INTERPRETER
540
541 static void
542 tt_size_done_bytecode( FT_Size ftsize )
543 {
544 TT_Size size = (TT_Size)ftsize;
545 TT_Face face = (TT_Face)ftsize->face;
546 FT_Memory memory = face->root.memory;
547
548
549 if ( size->debug )
550 {
551 /* the debug context must be deleted by the debugger itself */
552 size->context = NULL;
553 size->debug = FALSE;
554 }
555
556 FT_FREE( size->cvt );
557 size->cvt_size = 0;
558
559 /* free storage area */
560 FT_FREE( size->storage );
561 size->storage_size = 0;
562
563 /* twilight zone */
564 tt_glyphzone_done( &size->twilight );
565
566 FT_FREE( size->function_defs );
567 FT_FREE( size->instruction_defs );
568
569 size->num_function_defs = 0;
570 size->max_function_defs = 0;
571 size->num_instruction_defs = 0;
572 size->max_instruction_defs = 0;
573
574 size->max_func = 0;
575 size->max_ins = 0;
576
577 size->bytecode_ready = 0;
578 size->cvt_ready = 0;
579 }
580
581
582 /* Initialize bytecode-related fields in the size object. */
583 /* We do this only if bytecode interpretation is really needed. */
584 static FT_Error
585 tt_size_init_bytecode( FT_Size ftsize )
586 {
587 FT_Error error;
588 TT_Size size = (TT_Size)ftsize;
589 TT_Face face = (TT_Face)ftsize->face;
590 FT_Memory memory = face->root.memory;
591 FT_Int i;
592
593 FT_UShort n_twilight;
594 TT_MaxProfile* maxp = &face->max_profile;
595
596
597 size->bytecode_ready = 1;
598 size->cvt_ready = 0;
599
600 size->max_function_defs = maxp->maxFunctionDefs;
601 size->max_instruction_defs = maxp->maxInstructionDefs;
602
603 size->num_function_defs = 0;
604 size->num_instruction_defs = 0;
605
606 size->max_func = 0;
607 size->max_ins = 0;
608
609 size->cvt_size = face->cvt_size;
610 size->storage_size = maxp->maxStorage;
611
612 /* Set default metrics */
613 {
614 TT_Size_Metrics* metrics = &size->ttmetrics;
615
616
617 metrics->rotated = FALSE;
618 metrics->stretched = FALSE;
619
620 /* set default compensation (all 0) */
621 for ( i = 0; i < 4; i++ )
622 metrics->compensations[i] = 0;
623 }
624
625 /* allocate function defs, instruction defs, cvt, and storage area */
626 if ( FT_NEW_ARRAY( size->function_defs, size->max_function_defs ) ||
627 FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) ||
628 FT_NEW_ARRAY( size->cvt, size->cvt_size ) ||
629 FT_NEW_ARRAY( size->storage, size->storage_size ) )
630 goto Exit;
631
632 /* reserve twilight zone */
633 n_twilight = maxp->maxTwilightPoints;
634
635 /* there are 4 phantom points (do we need this?) */
636 n_twilight += 4;
637
638 error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight );
639 if ( error )
640 goto Exit;
641
642 size->twilight.n_points = n_twilight;
643
644 size->GS = tt_default_graphics_state;
645
646 /* set `face->interpreter' according to the debug hook present */
647 {
648 FT_Library library = face->root.driver->root.library;
649
650
651 face->interpreter = (TT_Interpreter)
652 library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
653 if ( !face->interpreter )
654 face->interpreter = (TT_Interpreter)TT_RunIns;
655 }
656
657 /* Fine, now run the font program! */
658 error = tt_size_run_fpgm( size );
659
660 Exit:
661 if ( error )
662 tt_size_done_bytecode( ftsize );
663
664 return error;
665 }
666
667
668 FT_LOCAL_DEF( FT_Error )
669 tt_size_ready_bytecode( TT_Size size )
670 {
671 FT_Error error = TT_Err_Ok;
672
673
674 if ( !size->bytecode_ready )
675 {
676 error = tt_size_init_bytecode( (FT_Size)size );
677 if ( error )
678 goto Exit;
679 }
680
681 /* rescale CVT when needed */
682 if ( !size->cvt_ready )
683 {
684 FT_UInt i;
685 TT_Face face = (TT_Face)size->root.face;
686
687
688 /* Scale the cvt values to the new ppem. */
689 /* We use by default the y ppem to scale the CVT. */
690 for ( i = 0; i < size->cvt_size; i++ )
691 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
692
693 /* all twilight points are originally zero */
694 for ( i = 0; i < (FT_UInt)size->twilight.n_points; i++ )
695 {
696 size->twilight.org[i].x = 0;
697 size->twilight.org[i].y = 0;
698 size->twilight.cur[i].x = 0;
699 size->twilight.cur[i].y = 0;
700 }
701
702 /* clear storage area */
703 for ( i = 0; i < (FT_UInt)size->storage_size; i++ )
704 size->storage[i] = 0;
705
706 size->GS = tt_default_graphics_state;
707
708 error = tt_size_run_prep( size );
709 if ( !error )
710 size->cvt_ready = 1;
711 }
712
713 Exit:
714 return error;
715 }
716
717 #endif /* TT_USE_BYTECODE_INTERPRETER */
718
719
720 /*************************************************************************/
721 /* */
722 /* <Function> */
723 /* tt_size_init */
724 /* */
725 /* <Description> */
726 /* Initialize a new TrueType size object. */
727 /* */
728 /* <InOut> */
729 /* size :: A handle to the size object. */
730 /* */
731 /* <Return> */
732 /* FreeType error code. 0 means success. */
733 /* */
734 FT_LOCAL_DEF( FT_Error )
735 tt_size_init( FT_Size ttsize ) /* TT_Size */
736 {
737 TT_Size size = (TT_Size)ttsize;
738 FT_Error error = TT_Err_Ok;
739
740 #ifdef TT_USE_BYTECODE_INTERPRETER
741 size->bytecode_ready = 0;
742 size->cvt_ready = 0;
743 #endif
744
745 size->ttmetrics.valid = FALSE;
746 size->strike_index = 0xFFFFFFFFUL;
747
748 return error;
749 }
750
751
752 /*************************************************************************/
753 /* */
754 /* <Function> */
755 /* tt_size_done */
756 /* */
757 /* <Description> */
758 /* The TrueType size object finalizer. */
759 /* */
760 /* <Input> */
761 /* size :: A handle to the target size object. */
762 /* */
763 FT_LOCAL_DEF( void )
764 tt_size_done( FT_Size ttsize ) /* TT_Size */
765 {
766 TT_Size size = (TT_Size)ttsize;
767
768
769 #ifdef TT_USE_BYTECODE_INTERPRETER
770 if ( size->bytecode_ready )
771 tt_size_done_bytecode( ttsize );
772 #endif
773
774 size->ttmetrics.valid = FALSE;
775 }
776
777
778 /*************************************************************************/
779 /* */
780 /* <Function> */
781 /* tt_size_reset */
782 /* */
783 /* <Description> */
784 /* Reset a TrueType size when resolutions and character dimensions */
785 /* have been changed. */
786 /* */
787 /* <Input> */
788 /* size :: A handle to the target size object. */
789 /* */
790 FT_LOCAL_DEF( FT_Error )
791 tt_size_reset( TT_Size size )
792 {
793 TT_Face face;
794 FT_Error error = TT_Err_Ok;
795 FT_Size_Metrics* metrics;
796
797
798 size->ttmetrics.valid = FALSE;
799
800 face = (TT_Face)size->root.face;
801
802 metrics = &size->metrics;
803
804 /* copy the result from base layer */
805 *metrics = size->root.metrics;
806
807 if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
808 return TT_Err_Invalid_PPem;
809
810 /* This bit flag, if set, indicates that the ppems must be */
811 /* rounded to integers. Nearly all TrueType fonts have this bit */
812 /* set, as hinting won't work really well otherwise. */
813 /* */
814 if ( face->header.Flags & 8 )
815 {
816 metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
817 face->root.units_per_EM );
818 metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
819 face->root.units_per_EM );
820
821 metrics->ascender =
822 FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) );
823 metrics->descender =
824 FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) );
825 metrics->height =
826 FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) );
827 metrics->max_advance =
828 FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width,
829 metrics->x_scale ) );
830 }
831
832 /* compute new transformation */
833 if ( metrics->x_ppem >= metrics->y_ppem )
834 {
835 size->ttmetrics.scale = metrics->x_scale;
836 size->ttmetrics.ppem = metrics->x_ppem;
837 size->ttmetrics.x_ratio = 0x10000L;
838 size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
839 0x10000L,
840 metrics->x_ppem );
841 }
842 else
843 {
844 size->ttmetrics.scale = metrics->y_scale;
845 size->ttmetrics.ppem = metrics->y_ppem;
846 size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
847 0x10000L,
848 metrics->y_ppem );
849 size->ttmetrics.y_ratio = 0x10000L;
850 }
851
852 #ifdef TT_USE_BYTECODE_INTERPRETER
853 size->cvt_ready = 0;
854 #endif /* TT_USE_BYTECODE_INTERPRETER */
855
856 if ( !error )
857 size->ttmetrics.valid = TRUE;
858
859 return error;
860 }
861
862
863 /*************************************************************************/
864 /* */
865 /* <Function> */
866 /* tt_driver_init */
867 /* */
868 /* <Description> */
869 /* Initialize a given TrueType driver object. */
870 /* */
871 /* <Input> */
872 /* driver :: A handle to the target driver object. */
873 /* */
874 /* <Return> */
875 /* FreeType error code. 0 means success. */
876 /* */
877 FT_LOCAL_DEF( FT_Error )
878 tt_driver_init( FT_Module ttdriver ) /* TT_Driver */
879 {
880
881 #ifdef TT_USE_BYTECODE_INTERPRETER
882
883 TT_Driver driver = (TT_Driver)ttdriver;
884
885
886 if ( !TT_New_Context( driver ) )
887 return TT_Err_Could_Not_Find_Context;
888
889 #else
890
891 FT_UNUSED( ttdriver );
892
893 #endif
894
895 return TT_Err_Ok;
896 }
897
898
899 /*************************************************************************/
900 /* */
901 /* <Function> */
902 /* tt_driver_done */
903 /* */
904 /* <Description> */
905 /* Finalize a given TrueType driver. */
906 /* */
907 /* <Input> */
908 /* driver :: A handle to the target TrueType driver. */
909 /* */
910 FT_LOCAL_DEF( void )
911 tt_driver_done( FT_Module ttdriver ) /* TT_Driver */
912 {
913 #ifdef TT_USE_BYTECODE_INTERPRETER
914 TT_Driver driver = (TT_Driver)ttdriver;
915
916
917 /* destroy the execution context */
918 if ( driver->context )
919 {
920 TT_Done_Context( driver->context );
921 driver->context = NULL;
922 }
923 #else
924 FT_UNUSED( ttdriver );
925 #endif
926
927 }
928
929
930 /*************************************************************************/
931 /* */
932 /* <Function> */
933 /* tt_slot_init */
934 /* */
935 /* <Description> */
936 /* Initialize a new slot object. */
937 /* */
938 /* <InOut> */
939 /* slot :: A handle to the slot object. */
940 /* */
941 /* <Return> */
942 /* FreeType error code. 0 means success. */
943 /* */
944 FT_LOCAL_DEF( FT_Error )
945 tt_slot_init( FT_GlyphSlot slot )
946 {
947 return FT_GlyphLoader_CreateExtra( slot->internal->loader );
948 }
949
950
951 /* END */
A free Windows-compatible Operating System