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Issue 815103002: Update freetype to 2.5.4. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: Adjust GYP and GN Created 6 years ago
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1 /***************************************************************************/
2 /* */
3 /* sfnt.h */
4 /* */
5 /* High-level `sfnt' driver interface (specification). */
6 /* */
7 /* Copyright 1996-2006, 2009, 2012-2013 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 #ifndef __SFNT_H__
20 #define __SFNT_H__
21
22
23 #include "../../ft2build.h"
24 #include "ftdriver.h"
25 #include "tttypes.h"
26
27
28 FT_BEGIN_HEADER
29
30
31 /*************************************************************************/
32 /* */
33 /* <FuncType> */
34 /* TT_Init_Face_Func */
35 /* */
36 /* <Description> */
37 /* First part of the SFNT face object initialization. This finds */
38 /* the face in a SFNT file or collection, and load its format tag in */
39 /* face->format_tag. */
40 /* */
41 /* <Input> */
42 /* stream :: The input stream. */
43 /* */
44 /* face :: A handle to the target face object. */
45 /* */
46 /* face_index :: The index of the TrueType font, if we are opening a */
47 /* collection. */
48 /* */
49 /* num_params :: The number of additional parameters. */
50 /* */
51 /* params :: Optional additional parameters. */
52 /* */
53 /* <Return> */
54 /* FreeType error code. 0 means success. */
55 /* */
56 /* <Note> */
57 /* The stream cursor must be at the font file's origin. */
58 /* */
59 /* This function recognizes fonts embedded in a `TrueType */
60 /* collection'. */
61 /* */
62 /* Once the format tag has been validated by the font driver, it */
63 /* should then call the TT_Load_Face_Func() callback to read the rest */
64 /* of the SFNT tables in the object. */
65 /* */
66 typedef FT_Error
67 (*TT_Init_Face_Func)( FT_Stream stream,
68 TT_Face face,
69 FT_Int face_index,
70 FT_Int num_params,
71 FT_Parameter* params );
72
73
74 /*************************************************************************/
75 /* */
76 /* <FuncType> */
77 /* TT_Load_Face_Func */
78 /* */
79 /* <Description> */
80 /* Second part of the SFNT face object initialization. This loads */
81 /* the common SFNT tables (head, OS/2, maxp, metrics, etc.) in the */
82 /* face object. */
83 /* */
84 /* <Input> */
85 /* stream :: The input stream. */
86 /* */
87 /* face :: A handle to the target face object. */
88 /* */
89 /* face_index :: The index of the TrueType font, if we are opening a */
90 /* collection. */
91 /* */
92 /* num_params :: The number of additional parameters. */
93 /* */
94 /* params :: Optional additional parameters. */
95 /* */
96 /* <Return> */
97 /* FreeType error code. 0 means success. */
98 /* */
99 /* <Note> */
100 /* This function must be called after TT_Init_Face_Func(). */
101 /* */
102 typedef FT_Error
103 (*TT_Load_Face_Func)( FT_Stream stream,
104 TT_Face face,
105 FT_Int face_index,
106 FT_Int num_params,
107 FT_Parameter* params );
108
109
110 /*************************************************************************/
111 /* */
112 /* <FuncType> */
113 /* TT_Done_Face_Func */
114 /* */
115 /* <Description> */
116 /* A callback used to delete the common SFNT data from a face. */
117 /* */
118 /* <Input> */
119 /* face :: A handle to the target face object. */
120 /* */
121 /* <Note> */
122 /* This function does NOT destroy the face object. */
123 /* */
124 typedef void
125 (*TT_Done_Face_Func)( TT_Face face );
126
127
128 /*************************************************************************/
129 /* */
130 /* <FuncType> */
131 /* TT_Load_Any_Func */
132 /* */
133 /* <Description> */
134 /* Load any font table into client memory. */
135 /* */
136 /* <Input> */
137 /* face :: The face object to look for. */
138 /* */
139 /* tag :: The tag of table to load. Use the value 0 if you want */
140 /* to access the whole font file, else set this parameter */
141 /* to a valid TrueType table tag that you can forge with */
142 /* the MAKE_TT_TAG macro. */
143 /* */
144 /* offset :: The starting offset in the table (or the file if */
145 /* tag == 0). */
146 /* */
147 /* length :: The address of the decision variable: */
148 /* */
149 /* If length == NULL: */
150 /* Loads the whole table. Returns an error if */
151 /* `offset' == 0! */
152 /* */
153 /* If *length == 0: */
154 /* Exits immediately; returning the length of the given */
155 /* table or of the font file, depending on the value of */
156 /* `tag'. */
157 /* */
158 /* If *length != 0: */
159 /* Loads the next `length' bytes of table or font, */
160 /* starting at offset `offset' (in table or font too). */
161 /* */
162 /* <Output> */
163 /* buffer :: The address of target buffer. */
164 /* */
165 /* <Return> */
166 /* TrueType error code. 0 means success. */
167 /* */
168 typedef FT_Error
169 (*TT_Load_Any_Func)( TT_Face face,
170 FT_ULong tag,
171 FT_Long offset,
172 FT_Byte *buffer,
173 FT_ULong* length );
174
175
176 /*************************************************************************/
177 /* */
178 /* <FuncType> */
179 /* TT_Find_SBit_Image_Func */
180 /* */
181 /* <Description> */
182 /* Check whether an embedded bitmap (an `sbit') exists for a given */
183 /* glyph, at a given strike. */
184 /* */
185 /* <Input> */
186 /* face :: The target face object. */
187 /* */
188 /* glyph_index :: The glyph index. */
189 /* */
190 /* strike_index :: The current strike index. */
191 /* */
192 /* <Output> */
193 /* arange :: The SBit range containing the glyph index. */
194 /* */
195 /* astrike :: The SBit strike containing the glyph index. */
196 /* */
197 /* aglyph_offset :: The offset of the glyph data in `EBDT' table. */
198 /* */
199 /* <Return> */
200 /* FreeType error code. 0 means success. Returns */
201 /* SFNT_Err_Invalid_Argument if no sbit exists for the requested */
202 /* glyph. */
203 /* */
204 typedef FT_Error
205 (*TT_Find_SBit_Image_Func)( TT_Face face,
206 FT_UInt glyph_index,
207 FT_ULong strike_index,
208 TT_SBit_Range *arange,
209 TT_SBit_Strike *astrike,
210 FT_ULong *aglyph_offset );
211
212
213 /*************************************************************************/
214 /* */
215 /* <FuncType> */
216 /* TT_Load_SBit_Metrics_Func */
217 /* */
218 /* <Description> */
219 /* Get the big metrics for a given embedded bitmap. */
220 /* */
221 /* <Input> */
222 /* stream :: The input stream. */
223 /* */
224 /* range :: The SBit range containing the glyph. */
225 /* */
226 /* <Output> */
227 /* big_metrics :: A big SBit metrics structure for the glyph. */
228 /* */
229 /* <Return> */
230 /* FreeType error code. 0 means success. */
231 /* */
232 /* <Note> */
233 /* The stream cursor must be positioned at the glyph's offset within */
234 /* the `EBDT' table before the call. */
235 /* */
236 /* If the image format uses variable metrics, the stream cursor is */
237 /* positioned just after the metrics header in the `EBDT' table on */
238 /* function exit. */
239 /* */
240 typedef FT_Error
241 (*TT_Load_SBit_Metrics_Func)( FT_Stream stream,
242 TT_SBit_Range range,
243 TT_SBit_Metrics metrics );
244
245
246 /*************************************************************************/
247 /* */
248 /* <FuncType> */
249 /* TT_Load_SBit_Image_Func */
250 /* */
251 /* <Description> */
252 /* Load a given glyph sbit image from the font resource. This also */
253 /* returns its metrics. */
254 /* */
255 /* <Input> */
256 /* face :: */
257 /* The target face object. */
258 /* */
259 /* strike_index :: */
260 /* The strike index. */
261 /* */
262 /* glyph_index :: */
263 /* The current glyph index. */
264 /* */
265 /* load_flags :: */
266 /* The current load flags. */
267 /* */
268 /* stream :: */
269 /* The input stream. */
270 /* */
271 /* <Output> */
272 /* amap :: */
273 /* The target pixmap. */
274 /* */
275 /* ametrics :: */
276 /* A big sbit metrics structure for the glyph image. */
277 /* */
278 /* <Return> */
279 /* FreeType error code. 0 means success. Returns an error if no */
280 /* glyph sbit exists for the index. */
281 /* */
282 /* <Note> */
283 /* The `map.buffer' field is always freed before the glyph is loaded. */
284 /* */
285 typedef FT_Error
286 (*TT_Load_SBit_Image_Func)( TT_Face face,
287 FT_ULong strike_index,
288 FT_UInt glyph_index,
289 FT_UInt load_flags,
290 FT_Stream stream,
291 FT_Bitmap *amap,
292 TT_SBit_MetricsRec *ametrics );
293
294
295 /*************************************************************************/
296 /* */
297 /* <FuncType> */
298 /* TT_Set_SBit_Strike_Func */
299 /* */
300 /* <Description> */
301 /* Select an sbit strike for a given size request. */
302 /* */
303 /* <Input> */
304 /* face :: The target face object. */
305 /* */
306 /* req :: The size request. */
307 /* */
308 /* <Output> */
309 /* astrike_index :: The index of the sbit strike. */
310 /* */
311 /* <Return> */
312 /* FreeType error code. 0 means success. Returns an error if no */
313 /* sbit strike exists for the selected ppem values. */
314 /* */
315 typedef FT_Error
316 (*TT_Set_SBit_Strike_Func)( TT_Face face,
317 FT_Size_Request req,
318 FT_ULong* astrike_index );
319
320
321 /*************************************************************************/
322 /* */
323 /* <FuncType> */
324 /* TT_Load_Strike_Metrics_Func */
325 /* */
326 /* <Description> */
327 /* Load the metrics of a given strike. */
328 /* */
329 /* <Input> */
330 /* face :: The target face object. */
331 /* */
332 /* strike_index :: The strike index. */
333 /* */
334 /* <Output> */
335 /* metrics :: the metrics of the strike. */
336 /* */
337 /* <Return> */
338 /* FreeType error code. 0 means success. Returns an error if no */
339 /* such sbit strike exists. */
340 /* */
341 typedef FT_Error
342 (*TT_Load_Strike_Metrics_Func)( TT_Face face,
343 FT_ULong strike_index,
344 FT_Size_Metrics* metrics );
345
346
347 /*************************************************************************/
348 /* */
349 /* <FuncType> */
350 /* TT_Get_PS_Name_Func */
351 /* */
352 /* <Description> */
353 /* Get the PostScript glyph name of a glyph. */
354 /* */
355 /* <Input> */
356 /* idx :: The glyph index. */
357 /* */
358 /* PSname :: The address of a string pointer. Will be NULL in case */
359 /* of error, otherwise it is a pointer to the glyph name. */
360 /* */
361 /* You must not modify the returned string! */
362 /* */
363 /* <Output> */
364 /* FreeType error code. 0 means success. */
365 /* */
366 typedef FT_Error
367 (*TT_Get_PS_Name_Func)( TT_Face face,
368 FT_UInt idx,
369 FT_String** PSname );
370
371
372 /*************************************************************************/
373 /* */
374 /* <FuncType> */
375 /* TT_Load_Metrics_Func */
376 /* */
377 /* <Description> */
378 /* Load a metrics table, which is a table with a horizontal and a */
379 /* vertical version. */
380 /* */
381 /* <Input> */
382 /* face :: A handle to the target face object. */
383 /* */
384 /* stream :: The input stream. */
385 /* */
386 /* vertical :: A boolean flag. If set, load the vertical one. */
387 /* */
388 /* <Return> */
389 /* FreeType error code. 0 means success. */
390 /* */
391 typedef FT_Error
392 (*TT_Load_Metrics_Func)( TT_Face face,
393 FT_Stream stream,
394 FT_Bool vertical );
395
396
397 /*************************************************************************/
398 /* */
399 /* <FuncType> */
400 /* TT_Get_Metrics_Func */
401 /* */
402 /* <Description> */
403 /* Load the horizontal or vertical header in a face object. */
404 /* */
405 /* <Input> */
406 /* face :: A handle to the target face object. */
407 /* */
408 /* stream :: The input stream. */
409 /* */
410 /* vertical :: A boolean flag. If set, load vertical metrics. */
411 /* */
412 /* <Return> */
413 /* FreeType error code. 0 means success. */
414 /* */
415 typedef FT_Error
416 (*TT_Get_Metrics_Func)( TT_Face face,
417 FT_Bool vertical,
418 FT_UInt gindex,
419 FT_Short* abearing,
420 FT_UShort* aadvance );
421
422
423 /*************************************************************************/
424 /* */
425 /* <FuncType> */
426 /* TT_Load_Table_Func */
427 /* */
428 /* <Description> */
429 /* Load a given TrueType table. */
430 /* */
431 /* <Input> */
432 /* face :: A handle to the target face object. */
433 /* */
434 /* stream :: The input stream. */
435 /* */
436 /* <Return> */
437 /* FreeType error code. 0 means success. */
438 /* */
439 /* <Note> */
440 /* The function uses `face->goto_table' to seek the stream to the */
441 /* start of the table, except while loading the font directory. */
442 /* */
443 typedef FT_Error
444 (*TT_Load_Table_Func)( TT_Face face,
445 FT_Stream stream );
446
447
448 /*************************************************************************/
449 /* */
450 /* <FuncType> */
451 /* TT_Free_Table_Func */
452 /* */
453 /* <Description> */
454 /* Free a given TrueType table. */
455 /* */
456 /* <Input> */
457 /* face :: A handle to the target face object. */
458 /* */
459 typedef void
460 (*TT_Free_Table_Func)( TT_Face face );
461
462
463 /*
464 * @functype:
465 * TT_Face_GetKerningFunc
466 *
467 * @description:
468 * Return the horizontal kerning value between two glyphs.
469 *
470 * @input:
471 * face :: A handle to the source face object.
472 * left_glyph :: The left glyph index.
473 * right_glyph :: The right glyph index.
474 *
475 * @return:
476 * The kerning value in font units.
477 */
478 typedef FT_Int
479 (*TT_Face_GetKerningFunc)( TT_Face face,
480 FT_UInt left_glyph,
481 FT_UInt right_glyph );
482
483
484 /*************************************************************************/
485 /* */
486 /* <Struct> */
487 /* SFNT_Interface */
488 /* */
489 /* <Description> */
490 /* This structure holds pointers to the functions used to load and */
491 /* free the basic tables that are required in a `sfnt' font file. */
492 /* */
493 /* <Fields> */
494 /* Check the various xxx_Func() descriptions for details. */
495 /* */
496 typedef struct SFNT_Interface_
497 {
498 TT_Loader_GotoTableFunc goto_table;
499
500 TT_Init_Face_Func init_face;
501 TT_Load_Face_Func load_face;
502 TT_Done_Face_Func done_face;
503 FT_Module_Requester get_interface;
504
505 TT_Load_Any_Func load_any;
506
507 /* these functions are called by `load_face' but they can also */
508 /* be called from external modules, if there is a need to do so */
509 TT_Load_Table_Func load_head;
510 TT_Load_Metrics_Func load_hhea;
511 TT_Load_Table_Func load_cmap;
512 TT_Load_Table_Func load_maxp;
513 TT_Load_Table_Func load_os2;
514 TT_Load_Table_Func load_post;
515
516 TT_Load_Table_Func load_name;
517 TT_Free_Table_Func free_name;
518
519 /* this field was called `load_kerning' up to version 2.1.10 */
520 TT_Load_Table_Func load_kern;
521
522 TT_Load_Table_Func load_gasp;
523 TT_Load_Table_Func load_pclt;
524
525 /* see `ttload.h'; this field was called `load_bitmap_header' up to */
526 /* version 2.1.10 */
527 TT_Load_Table_Func load_bhed;
528
529 TT_Load_SBit_Image_Func load_sbit_image;
530
531 /* see `ttpost.h' */
532 TT_Get_PS_Name_Func get_psname;
533 TT_Free_Table_Func free_psnames;
534
535 /* starting here, the structure differs from version 2.1.7 */
536
537 /* this field was introduced in version 2.1.8, named `get_psname' */
538 TT_Face_GetKerningFunc get_kerning;
539
540 /* new elements introduced after version 2.1.10 */
541
542 /* load the font directory, i.e., the offset table and */
543 /* the table directory */
544 TT_Load_Table_Func load_font_dir;
545 TT_Load_Metrics_Func load_hmtx;
546
547 TT_Load_Table_Func load_eblc;
548 TT_Free_Table_Func free_eblc;
549
550 TT_Set_SBit_Strike_Func set_sbit_strike;
551 TT_Load_Strike_Metrics_Func load_strike_metrics;
552
553 TT_Get_Metrics_Func get_metrics;
554
555 } SFNT_Interface;
556
557
558 /* transitional */
559 typedef SFNT_Interface* SFNT_Service;
560
561 #ifndef FT_CONFIG_OPTION_PIC
562
563 #define FT_DEFINE_SFNT_INTERFACE( \
564 class_, \
565 goto_table_, \
566 init_face_, \
567 load_face_, \
568 done_face_, \
569 get_interface_, \
570 load_any_, \
571 load_head_, \
572 load_hhea_, \
573 load_cmap_, \
574 load_maxp_, \
575 load_os2_, \
576 load_post_, \
577 load_name_, \
578 free_name_, \
579 load_kern_, \
580 load_gasp_, \
581 load_pclt_, \
582 load_bhed_, \
583 load_sbit_image_, \
584 get_psname_, \
585 free_psnames_, \
586 get_kerning_, \
587 load_font_dir_, \
588 load_hmtx_, \
589 load_eblc_, \
590 free_eblc_, \
591 set_sbit_strike_, \
592 load_strike_metrics_, \
593 get_metrics_ ) \
594 static const SFNT_Interface class_ = \
595 { \
596 goto_table_, \
597 init_face_, \
598 load_face_, \
599 done_face_, \
600 get_interface_, \
601 load_any_, \
602 load_head_, \
603 load_hhea_, \
604 load_cmap_, \
605 load_maxp_, \
606 load_os2_, \
607 load_post_, \
608 load_name_, \
609 free_name_, \
610 load_kern_, \
611 load_gasp_, \
612 load_pclt_, \
613 load_bhed_, \
614 load_sbit_image_, \
615 get_psname_, \
616 free_psnames_, \
617 get_kerning_, \
618 load_font_dir_, \
619 load_hmtx_, \
620 load_eblc_, \
621 free_eblc_, \
622 set_sbit_strike_, \
623 load_strike_metrics_, \
624 get_metrics_, \
625 };
626
627 #else /* FT_CONFIG_OPTION_PIC */
628
629 #define FT_INTERNAL( a, a_ ) \
630 clazz->a = a_;
631
632 #define FT_DEFINE_SFNT_INTERFACE( \
633 class_, \
634 goto_table_, \
635 init_face_, \
636 load_face_, \
637 done_face_, \
638 get_interface_, \
639 load_any_, \
640 load_head_, \
641 load_hhea_, \
642 load_cmap_, \
643 load_maxp_, \
644 load_os2_, \
645 load_post_, \
646 load_name_, \
647 free_name_, \
648 load_kern_, \
649 load_gasp_, \
650 load_pclt_, \
651 load_bhed_, \
652 load_sbit_image_, \
653 get_psname_, \
654 free_psnames_, \
655 get_kerning_, \
656 load_font_dir_, \
657 load_hmtx_, \
658 load_eblc_, \
659 free_eblc_, \
660 set_sbit_strike_, \
661 load_strike_metrics_, \
662 get_metrics_ ) \
663 void \
664 FT_Init_Class_ ## class_( FT_Library library, \
665 SFNT_Interface* clazz ) \
666 { \
667 FT_UNUSED( library ); \
668 \
669 clazz->goto_table = goto_table_; \
670 clazz->init_face = init_face_; \
671 clazz->load_face = load_face_; \
672 clazz->done_face = done_face_; \
673 clazz->get_interface = get_interface_; \
674 clazz->load_any = load_any_; \
675 clazz->load_head = load_head_; \
676 clazz->load_hhea = load_hhea_; \
677 clazz->load_cmap = load_cmap_; \
678 clazz->load_maxp = load_maxp_; \
679 clazz->load_os2 = load_os2_; \
680 clazz->load_post = load_post_; \
681 clazz->load_name = load_name_; \
682 clazz->free_name = free_name_; \
683 clazz->load_kern = load_kern_; \
684 clazz->load_gasp = load_gasp_; \
685 clazz->load_pclt = load_pclt_; \
686 clazz->load_bhed = load_bhed_; \
687 clazz->load_sbit_image = load_sbit_image_; \
688 clazz->get_psname = get_psname_; \
689 clazz->free_psnames = free_psnames_; \
690 clazz->get_kerning = get_kerning_; \
691 clazz->load_font_dir = load_font_dir_; \
692 clazz->load_hmtx = load_hmtx_; \
693 clazz->load_eblc = load_eblc_; \
694 clazz->free_eblc = free_eblc_; \
695 clazz->set_sbit_strike = set_sbit_strike_; \
696 clazz->load_strike_metrics = load_strike_metrics_; \
697 clazz->get_metrics = get_metrics_; \
698 }
699
700 #endif /* FT_CONFIG_OPTION_PIC */
701
702 FT_END_HEADER
703
704 #endif /* __SFNT_H__ */
705
706
707 /* END */
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