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better focus handling (blind fix)
[wxWidgets.git] / src / freetype / truetype / ttobjs.c
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cabec872
RR		 1/***************************************************************************/
2/* */
3/* ttobjs.c */
4/* */
5/* Objects manager (body). */
6/* */
7/* Copyright 1996-2000 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 <freetype/internal/ftdebug.h>
20#include <freetype/internal/ftcalc.h>
21#include <freetype/internal/ftstream.h>
22#include <freetype/ttnameid.h>
23#include <freetype/tttags.h>
24
25#include <freetype/internal/sfnt.h>
26#include <freetype/internal/psnames.h>
27
28
29#ifdef FT_FLAT_COMPILE
30
31#include "ttgload.h"
32#include "ttpload.h"
33
34#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
35#include "ttinterp.h"
36#endif
37
38#else /* FT_FLAT_COMPILE */
39
40#include <truetype/ttgload.h>
41#include <truetype/ttpload.h>
42
43#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
44#include <truetype/ttinterp.h>
45#endif
46
47#endif /* FT_FLAT_COMPILE */
48
49
50#include <freetype/internal/tterrors.h>
51
52
53
54 /*************************************************************************/
55 /* */
56 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
57 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
58 /* messages during execution. */
59 /* */
60#undef FT_COMPONENT
61#define FT_COMPONENT trace_ttobjs
62
63
64 /*************************************************************************/
65 /* */
66 /* GLYPH ZONE FUNCTIONS */
67 /* */
68 /*************************************************************************/
69
70 /*************************************************************************/
71 /* */
72 /* <Function> */
73 /* TT_Done_GlyphZone */
74 /* */
75 /* <Description> */
76 /* Deallocates a glyph zone. */
77 /* */
78 /* <Input> */
79 /* zone :: A pointer to the target glyph zone. */
80 /* */
81 LOCAL_FUNC
82 void TT_Done_GlyphZone( TT_GlyphZone* zone )
83 {
84 FT_Memory memory = zone->memory;
85
86
87 FREE( zone->contours );
88 FREE( zone->tags );
89 FREE( zone->cur );
90 FREE( zone->org );
91
92 zone->max_points = zone->n_points = 0;
93 zone->max_contours = zone->n_contours = 0;
94 }
95
96
97 /*************************************************************************/
98 /* */
99 /* <Function> */
100 /* TT_New_GlyphZone */
101 /* */
102 /* <Description> */
103 /* Allocates a new glyph zone. */
104 /* */
105 /* <Input> */
106 /* memory :: A handle to the current memory object. */
107 /* */
108 /* maxPoints :: The capacity of glyph zone in points. */
109 /* */
110 /* maxContours :: The capacity of glyph zone in contours. */
111 /* */
112 /* <Output> */
113 /* zone :: A pointer to the target glyph zone record. */
114 /* */
115 /* <Return> */
116 /* FreeType error code. 0 means success. */
117 /* */
118 LOCAL_FUNC
119 FT_Error TT_New_GlyphZone( FT_Memory memory,
120 FT_UShort maxPoints,
121 FT_Short maxContours,
122 TT_GlyphZone* zone )
123 {
124 FT_Error error;
125
126
127 if ( maxPoints > 0 )
128 maxPoints += 2;
129
130 MEM_Set( zone, 0, sizeof ( *zone ) );
131 zone->memory = memory;
132
133 if ( ALLOC_ARRAY( zone->org, maxPoints * 2, FT_F26Dot6 ) ||
134 ALLOC_ARRAY( zone->cur, maxPoints * 2, FT_F26Dot6 ) ||
135 ALLOC_ARRAY( zone->tags, maxPoints, FT_Byte ) ||
136 ALLOC_ARRAY( zone->contours, maxContours, FT_UShort ) )
137 {
138 TT_Done_GlyphZone( zone );
139 }
140
141 return error;
142 }
143
144
145 /*************************************************************************/
146 /* */
147 /* <Function> */
148 /* TT_Init_Face */
149 /* */
150 /* <Description> */
151 /* Initializes a given TrueType face object. */
152 /* */
153 /* <Input> */
154 /* stream :: The source font stream. */
155 /* */
156 /* face_index :: The index of the font face in the resource. */
157 /* */
158 /* num_params :: Number of additional generic parameters. Ignored. */
159 /* */
160 /* params :: Additional generic parameters. Ignored. */
161 /* */
162 /* <InOut> */
163 /* face :: The newly built face object. */
164 /* */
165 /* <Return> */
166 /* FreeType error code. 0 means success. */
167 /* */
168 LOCAL_DEF
169 FT_Error TT_Init_Face( FT_Stream stream,
170 TT_Face face,
171 FT_Int face_index,
172 FT_Int num_params,
173 FT_Parameter* params )
174 {
175 FT_Error error;
176 FT_Library library;
177 SFNT_Interface* sfnt;
178
179
180 library = face->root.driver->root.library;
181 sfnt = (SFNT_Interface*)FT_Get_Module_Interface( library, "sfnt" );
182 if ( !sfnt )
183 goto Bad_Format;
184
185 /* create input stream from resource */
186 if ( FILE_Seek( 0 ) )
187 goto Exit;
188
189 /* check that we have a valid TrueType file */
190 error = sfnt->init_face( stream, face, face_index, num_params, params );
191 if ( error )
192 goto Exit;
193
194 /* We must also be able to accept Mac/GX fonts, as well as OT ones */
195 if ( face->format_tag != 0x00010000L && /* MS fonts */
196 face->format_tag != TTAG_true ) /* Mac fonts */
197 {
198 FT_TRACE2(( "[not a valid TTF font]\n" ));
199 goto Bad_Format;
200 }
201
202 /* If we are performing a simple font format check, exit immediately */
203 if ( face_index < 0 )
204 return TT_Err_Ok;
205
206 /* Load font directory */
207 error = sfnt->load_face( stream, face, face_index, num_params, params );
208 if ( error )
209 goto Exit;
210
211 error = TT_Load_Locations( face, stream ) ||
212 TT_Load_CVT ( face, stream ) ||
213 TT_Load_Programs ( face, stream );
214
215 /* initialize standard glyph loading routines */
216 TT_Init_Glyph_Loading( face );
217
218 Exit:
219 return error;
220
221 Bad_Format:
222 error = FT_Err_Unknown_File_Format;
223 goto Exit;
224 }
225
226
227 /*************************************************************************/
228 /* */
229 /* <Function> */
230 /* TT_Done_Face */
231 /* */
232 /* <Description> */
233 /* Finalizes a given face object. */
234 /* */
235 /* <Input> */
236 /* face :: A pointer to the face object to destroy. */
237 /* */
238 LOCAL_DEF
239 void TT_Done_Face( TT_Face face )
240 {
241 FT_Memory memory = face->root.memory;
242 FT_Stream stream = face->root.stream;
243
244 SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt;
245
246
247 /* for `extended TrueType formats' (i.e. compressed versions) */
248 if ( face->extra.finalizer )
249 face->extra.finalizer( face->extra.data );
250
251 if ( sfnt )
252 sfnt->done_face( face );
253
254 /* freeing the locations table */
255 FREE( face->glyph_locations );
256 face->num_locations = 0;
257
258 /* freeing the CVT */
259 FREE( face->cvt );
260 face->cvt_size = 0;
261
262 /* freeing the programs */
263 RELEASE_Frame( face->font_program );
264 RELEASE_Frame( face->cvt_program );
265 face->font_program_size = 0;
266 face->cvt_program_size = 0;
267 }
268
269
270 /*************************************************************************/
271 /* */
272 /* SIZE FUNCTIONS */
273 /* */
274 /*************************************************************************/
275
276
277 /*************************************************************************/
278 /* */
279 /* <Function> */
280 /* TT_Init_Size */
281 /* */
282 /* <Description> */
283 /* Initializes a new TrueType size object. */
284 /* */
285 /* <InOut> */
286 /* size :: A handle to the size object. */
287 /* */
288 /* <Return> */
289 /* FreeType error code. 0 means success. */
290 /* */
291 LOCAL_DEF
292 FT_Error TT_Init_Size( TT_Size size )
293 {
294 FT_Error error = TT_Err_Ok;
295
296
297#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
298
299 TT_Face face = (TT_Face)size->root.face;
300 FT_Memory memory = face->root.memory;
301 FT_Int i;
302
303 TT_ExecContext exec;
304 FT_UShort n_twilight;
305 TT_MaxProfile* maxp = &face->max_profile;
306
307
308 size->ttmetrics.valid = FALSE;
309
310 size->max_function_defs = maxp->maxFunctionDefs;
311 size->max_instruction_defs = maxp->maxInstructionDefs;
312
313 size->num_function_defs = 0;
314 size->num_instruction_defs = 0;
315
316 size->max_func = 0;
317 size->max_ins = 0;
318
319 size->cvt_size = face->cvt_size;
320 size->storage_size = maxp->maxStorage;
321
322 /* Set default metrics */
323 {
324 FT_Size_Metrics* metrics = &size->root.metrics;
325 TT_Size_Metrics* metrics2 = &size->ttmetrics;
326
327
328 metrics->x_ppem = 0;
329 metrics->y_ppem = 0;
330
331 metrics2->rotated = FALSE;
332 metrics2->stretched = FALSE;
333
334 /* set default compensation (all 0) */
335 for ( i = 0; i < 4; i++ )
336 metrics2->compensations[i] = 0;
337 }
338
339 /* allocate function defs, instruction defs, cvt, and storage area */
340 if ( ALLOC_ARRAY( size->function_defs,
341 size->max_function_defs,
342 TT_DefRecord ) ||
343
344 ALLOC_ARRAY( size->instruction_defs,
345 size->max_instruction_defs,
346 TT_DefRecord ) ||
347
348 ALLOC_ARRAY( size->cvt,
349 size->cvt_size, FT_Long ) ||
350
351 ALLOC_ARRAY( size->storage,
352 size->storage_size, FT_Long ) )
353
354 goto Fail_Memory;
355
356 /* reserve twilight zone */
357 n_twilight = maxp->maxTwilightPoints;
358 error = TT_New_GlyphZone( memory, n_twilight, 0, &size->twilight );
359 if ( error )
360 goto Fail_Memory;
361
362 size->twilight.n_points = n_twilight;
363
364 /* set `face->interpreter' according to the debug hook present */
365 {
366 FT_Library library = face->root.driver->root.library;
367
368
369 face->interpreter = (TT_Interpreter)
370 library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
371 if ( !face->interpreter )
372 face->interpreter = (TT_Interpreter)TT_RunIns;
373 }
374
375 /* Fine, now execute the font program! */
376 exec = size->context;
377 /* size objects used during debugging have their own context */
378 if ( !size->debug )
379 exec = TT_New_Context( face );
380
381 if ( !exec )
382 {
383 error = TT_Err_Could_Not_Find_Context;
384 goto Fail_Memory;
385 }
386
387 size->GS = tt_default_graphics_state;
388 TT_Load_Context( exec, face, size );
389
390 exec->callTop = 0;
391 exec->top = 0;
392
393 exec->period = 64;
394 exec->phase = 0;
395 exec->threshold = 0;
396
397 {
398 FT_Size_Metrics* metrics = &exec->metrics;
399 TT_Size_Metrics* tt_metrics = &exec->tt_metrics;
400
401
402 metrics->x_ppem = 0;
403 metrics->y_ppem = 0;
404 metrics->x_scale = 0;
405 metrics->y_scale = 0;
406
407 tt_metrics->ppem = 0;
408 tt_metrics->scale = 0;
409 tt_metrics->ratio = 0x10000L;
410 }
411
412 exec->instruction_trap = FALSE;
413
414 exec->cvtSize = size->cvt_size;
415 exec->cvt = size->cvt;
416
417 exec->F_dot_P = 0x10000L;
418
419 /* allow font program execution */
420 TT_Set_CodeRange( exec,
421 tt_coderange_font,
422 face->font_program,
423 face->font_program_size );
424
425 /* disable CVT and glyph programs coderange */
426 TT_Clear_CodeRange( exec, tt_coderange_cvt );
427 TT_Clear_CodeRange( exec, tt_coderange_glyph );
428
429 if ( face->font_program_size > 0 )
430 {
431 error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 );
432 if ( !error )
433 error = face->interpreter( exec );
434
435 if ( error )
436 goto Fail_Exec;
437 }
438 else
439 error = TT_Err_Ok;
440
441 TT_Save_Context( exec, size );
442
443 if ( !size->debug )
444 TT_Done_Context( exec );
445
446#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
447
448 size->ttmetrics.valid = FALSE;
449 return error;
450
451#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
452
453 Fail_Exec:
454 if ( !size->debug )
455 TT_Done_Context( exec );
456
457 Fail_Memory:
458
459#endif
460
461 TT_Done_Size( size );
462 return error;
463 }
464
465
466 /*************************************************************************/
467 /* */
468 /* <Function> */
469 /* TT_Done_Size */
470 /* */
471 /* <Description> */
472 /* The TrueType size object finalizer. */
473 /* */
474 /* <Input> */
475 /* size :: A handle to the target size object. */
476 /* */
477 LOCAL_FUNC
478 void TT_Done_Size( TT_Size size )
479 {
480
481#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
482
483 FT_Memory memory = size->root.face->memory;
484
485
486 if ( size->debug )
487 {
488 /* the debug context must be deleted by the debugger itself */
489 size->context = NULL;
490 size->debug = FALSE;
491 }
492
493 FREE( size->cvt );
494 size->cvt_size = 0;
495
496 /* free storage area */
497 FREE( size->storage );
498 size->storage_size = 0;
499
500 /* twilight zone */
501 TT_Done_GlyphZone( &size->twilight );
502
503 FREE( size->function_defs );
504 FREE( size->instruction_defs );
505
506 size->num_function_defs = 0;
507 size->max_function_defs = 0;
508 size->num_instruction_defs = 0;
509 size->max_instruction_defs = 0;
510
511 size->max_func = 0;
512 size->max_ins = 0;
513
514#endif
515
516 size->ttmetrics.valid = FALSE;
517 }
518
519
520 /*************************************************************************/
521 /* */
522 /* <Function> */
523 /* TT_Reset_Size */
524 /* */
525 /* <Description> */
526 /* Resets a TrueType size when resolutions and character dimensions */
527 /* have been changed. */
528 /* */
529 /* <Input> */
530 /* size :: A handle to the target size object. */
531 /* */
532 LOCAL_DEF
533 FT_Error TT_Reset_Size( TT_Size size )
534 {
535 TT_Face face;
536 FT_Error error = TT_Err_Ok;
537
538 FT_Size_Metrics* metrics;
539
540
541 if ( size->ttmetrics.valid )
542 return TT_Err_Ok;
543
544 face = (TT_Face)size->root.face;
545
546 metrics = &size->root.metrics;
547
548 if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
549 return TT_Err_Invalid_PPem;
550
551 /* compute new transformation */
552 if ( metrics->x_ppem >= metrics->y_ppem )
553 {
554 size->ttmetrics.scale = metrics->x_scale;
555 size->ttmetrics.ppem = metrics->x_ppem;
556 size->ttmetrics.x_ratio = 0x10000L;
557 size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
558 0x10000L,
559 metrics->x_ppem );
560 }
561 else
562 {
563 size->ttmetrics.scale = metrics->y_scale;
564 size->ttmetrics.ppem = metrics->y_ppem;
565 size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
566 0x10000L,
567 metrics->y_ppem );
568 size->ttmetrics.y_ratio = 0x10000L;
569 }
570
571 /* Compute root ascender, descender, test height, and max_advance */
572 metrics->ascender = ( FT_MulFix( face->root.ascender,
573 metrics->y_scale ) + 32 ) & -64;
574 metrics->descender = ( FT_MulFix( face->root.descender,
575 metrics->y_scale ) + 32 ) & -64;
576 metrics->height = ( FT_MulFix( face->root.height,
577 metrics->y_scale ) + 32 ) & -64;
578 metrics->max_advance = ( FT_MulFix( face->root.max_advance_width,
579 metrics->x_scale ) + 32 ) & -64;
580
581#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
582
583 {
584 TT_ExecContext exec;
585 FT_UInt i, j;
586
587
588 /* Scale the cvt values to the new ppem. */
589 /* We use by default the y ppem to scale the CVT. */
590 for ( i = 0; i < size->cvt_size; i++ )
591 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
592
593 /* All twilight points are originally zero */
594 for ( j = 0; j < size->twilight.n_points; j++ )
595 {
596 size->twilight.org[j].x = 0;
597 size->twilight.org[j].y = 0;
598 size->twilight.cur[j].x = 0;
599 size->twilight.cur[j].y = 0;
600 }
601
602 /* clear storage area */
603 for ( i = 0; i < size->storage_size; i++ )
604 size->storage[i] = 0;
605
606 size->GS = tt_default_graphics_state;
607
608 /* get execution context and run prep program */
609 if ( size->debug )
610 exec = size->context;
611 else
612 exec = TT_New_Context( face );
613 /* debugging instances have their own context */
614
615 if ( !exec )
616 return TT_Err_Could_Not_Find_Context;
617
618 TT_Load_Context( exec, face, size );
619
620 TT_Set_CodeRange( exec,
621 tt_coderange_cvt,
622 face->cvt_program,
623 face->cvt_program_size );
624
625 TT_Clear_CodeRange( exec, tt_coderange_glyph );
626
627 exec->instruction_trap = FALSE;
628
629 exec->top = 0;
630 exec->callTop = 0;
631
632 if ( face->cvt_program_size > 0 )
633 {
634 error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 );
635 if ( error )
636 goto End;
637
638 if ( !size->debug )
639 error = face->interpreter( exec );
640 }
641 else
642 error = TT_Err_Ok;
643
644 size->GS = exec->GS;
645 /* save default graphics state */
646
647 End:
648 TT_Save_Context( exec, size );
649
650 if ( !size->debug )
651 TT_Done_Context( exec );
652 /* debugging instances keep their context */
653 }
654
655#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
656
657 if ( !error )
658 size->ttmetrics.valid = TRUE;
659
660 return error;
661 }
662
663
664 /*************************************************************************/
665 /* */
666 /* <Function> */
667 /* TT_Init_Driver */
668 /* */
669 /* <Description> */
670 /* Initializes a given TrueType driver object. */
671 /* */
672 /* <Input> */
673 /* driver :: A handle to the target driver object. */
674 /* */
675 /* <Return> */
676 /* FreeType error code. 0 means success. */
677 /* */
678 LOCAL_FUNC
679 FT_Error TT_Init_Driver( TT_Driver driver )
680 {
681 FT_Error error;
682
683
684 /* set `extra' in glyph loader */
685 error = FT_GlyphLoader_Create_Extra( FT_DRIVER( driver )->glyph_loader );
686
687 /* init extension registry if needed */
688
689#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
690 if ( !error )
691 return TT_Init_Extensions( driver );
692#endif
693
694 return error;
695 }
696
697
698 /*************************************************************************/
699 /* */
700 /* <Function> */
701 /* TT_Done_Driver */
702 /* */
703 /* <Description> */
704 /* Finalizes a given TrueType driver. */
705 /* */
706 /* <Input> */
707 /* driver :: A handle to the target TrueType driver. */
708 /* */
709 LOCAL_FUNC
710 void TT_Done_Driver( TT_Driver driver )
711 {
712 /* destroy extensions registry if needed */
713
714#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
715
716 TT_Done_Extensions( driver );
717
718#endif
719
720#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
721
722 /* destroy the execution context */
723 if ( driver->context )
724 {
725 TT_Destroy_Context( driver->context, driver->root.root.memory );
726 driver->context = NULL;
727 }
728
729#endif
730
731 }
732
733
734/* END */
wxWidgets (Impactor)