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1 /***************************************************************************/
2 /* */
3 /* tttypes.h */
4 /* */
5 /* Basic SFNT/TrueType type definitions and interface (specification */
6 /* only). */
7 /* */
8 /* Copyright 1996-2000 by */
9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* */
11 /* This file is part of the FreeType project, and may only be used, */
12 /* modified, and distributed under the terms of the FreeType project */
13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
14 /* this file you indicate that you have read the license and */
15 /* understand and accept it fully. */
16 /* */
17 /***************************************************************************/
18
19
20 #ifndef TTTYPES_H
21 #define TTTYPES_H
22
23
24 #include <freetype/tttables.h>
25
26
27 /*************************************************************************/
28 /*************************************************************************/
29 /*************************************************************************/
30 /*** ***/
31 /*** ***/
32 /*** REQUIRED TRUETYPE/OPENTYPE TABLES DEFINITIONS ***/
33 /*** ***/
34 /*** ***/
35 /*************************************************************************/
36 /*************************************************************************/
37 /*************************************************************************/
38
39
40 /*************************************************************************/
41 /* */
42 /* <Struct> */
43 /* TTC_Header */
44 /* */
45 /* <Description> */
46 /* TrueType collection header. This table contains the offsets of */
47 /* the font headers of each distinct TrueType face in the file. */
48 /* */
49 /* <Fields> */
50 /* tag :: Must be `ttc ' to indicate a TrueType collection. */
51 /* */
52 /* version :: The version number. */
53 /* */
54 /* count :: The number of faces in the collection. The */
55 /* specification says this should be an unsigned long, but */
56 /* we use a signed long since we need the value -1 for */
57 /* specific purposes. */
58 /* */
59 /* offsets :: The offsets of the font headers, one per face. */
60 /* */
61 typedef struct TTC_Header_
62 {
63 FT_ULong tag;
64 FT_Fixed version;
65 FT_Long count;
66 FT_ULong* offsets;
67
68 } TTC_Header;
69
70
71 /*************************************************************************/
72 /* */
73 /* <Struct> */
74 /* SFNT_Header */
75 /* */
76 /* <Description> */
77 /* SFNT file format header. */
78 /* */
79 /* <Fields> */
80 /* format_tag :: The font format tag. */
81 /* */
82 /* num_tables :: The number of tables in file. */
83 /* */
84 /* search_range :: Must be 16*(max power of 2 <= num_tables). */
85 /* */
86 /* entry_selector :: Must be log2 of search_range/16. */
87 /* */
88 /* range_shift :: Must be num_tables*16 - search_range. */
89 /* */
90 typedef struct SFNT_Header_
91 {
92 FT_ULong format_tag;
93 FT_UShort num_tables;
94 FT_UShort search_range;
95 FT_UShort entry_selector;
96 FT_UShort range_shift;
97
98 } SFNT_Header;
99
100
101 /*************************************************************************/
102 /* */
103 /* <Struct> */
104 /* TT_TableDir */
105 /* */
106 /* <Description> */
107 /* This structure models a TrueType table directory. It is used to */
108 /* access the various tables of the font face. */
109 /* */
110 /* <Fields> */
111 /* version :: The version number; starts with 0x00010000. */
112 /* */
113 /* numTables :: The number of tables. */
114 /* */
115 /* searchRange :: Unused. */
116 /* */
117 /* entrySelector :: Unused. */
118 /* */
119 /* rangeShift :: Unused. */
120 /* */
121 /* <Note> */
122 /* This structure is only used during font opening. */
123 /* */
124 typedef struct TT_TableDir_
125 {
126 FT_Fixed version; /* should be 0x10000 */
127 FT_UShort numTables; /* number of tables */
128
129 FT_UShort searchRange; /* These parameters are only used */
130 FT_UShort entrySelector; /* for a dichotomy search in the */
131 FT_UShort rangeShift; /* directory. We ignore them. */
132
133 } TT_TableDir;
134
135
136 /*************************************************************************/
137 /* */
138 /* <Struct> */
139 /* TT_Table */
140 /* */
141 /* <Description> */
142 /* This structure describes a given table of a TrueType font. */
143 /* */
144 /* <Fields> */
145 /* Tag :: A four-bytes tag describing the table. */
146 /* */
147 /* CheckSum :: The table checksum. This value can be ignored. */
148 /* */
149 /* Offset :: The offset of the table from the start of the TrueType */
150 /* font in its resource. */
151 /* */
152 /* Length :: The table length (in bytes). */
153 /* */
154 typedef struct TT_Table_
155 {
156 FT_ULong Tag; /* table type */
157 FT_ULong CheckSum; /* table checksum */
158 FT_ULong Offset; /* table file offset */
159 FT_ULong Length; /* table length */
160
161 } TT_Table;
162
163
164 /*************************************************************************/
165 /* */
166 /* <Struct> */
167 /* TT_CMapDir */
168 /* */
169 /* <Description> */
170 /* This structure describes the directory of the `cmap' table, */
171 /* containing the font's character mappings table. */
172 /* */
173 /* <Fields> */
174 /* tableVersionNumber :: The version number. */
175 /* */
176 /* numCMaps :: The number of charmaps in the font. */
177 /* */
178 /* <Note> */
179 /* This structure is only used during font loading. */
180 /* */
181 typedef struct TT_CMapDir_
182 {
183 FT_UShort tableVersionNumber;
184 FT_UShort numCMaps;
185
186 } TT_CMapDir;
187
188
189 /*************************************************************************/
190 /* */
191 /* <Struct> */
192 /* TT_CMapDirEntry */
193 /* */
194 /* <Description> */
195 /* This structure describes a charmap in a TrueType font. */
196 /* */
197 /* <Fields> */
198 /* platformID :: An ID used to specify for which platform this */
199 /* charmap is defined (FreeType manages all platforms). */
200 /* */
201 /* encodingID :: A platform-specific ID used to indicate which source */
202 /* encoding is used in this charmap. */
203 /* */
204 /* offset :: The offset of the charmap relative to the start of */
205 /* the `cmap' table. */
206 /* */
207 /* <Note> */
208 /* This structure is only used during font loading. */
209 /* */
210 typedef struct TT_CMapDirEntry_
211 {
212 FT_UShort platformID;
213 FT_UShort platformEncodingID;
214 FT_Long offset;
215
216 } TT_CMapDirEntry;
217
218
219 /*************************************************************************/
220 /* */
221 /* <Struct> */
222 /* TT_LongMetrics */
223 /* */
224 /* <Description> */
225 /* A structure modeling the long metrics of the `hmtx' and `vmtx' */
226 /* TrueType tables. The values are expressed in font units. */
227 /* */
228 /* <Fields> */
229 /* advance :: The advance width or height for the glyph. */
230 /* */
231 /* bearing :: The left-side or top-side bearing for the glyph. */
232 /* */
233 typedef struct TT_LongMetrics_
234 {
235 FT_UShort advance;
236 FT_Short bearing;
237
238 } TT_LongMetrics;
239
240
241 /*************************************************************************/
242 /* */
243 /* <Type> TT_ShortMetrics */
244 /* */
245 /* <Description> */
246 /* A simple type to model the short metrics of the `hmtx' and `vmtx' */
247 /* tables. */
248 /* */
249 typedef FT_Short TT_ShortMetrics;
250
251
252 /*************************************************************************/
253 /* */
254 /* <Struct> */
255 /* TT_NameRec */
256 /* */
257 /* <Description> */
258 /* A structure modeling TrueType name records. Name records are used */
259 /* to store important strings like family name, style name, */
260 /* copyright, etc. in _localized_ versions (i.e., language, encoding, */
261 /* etc). */
262 /* */
263 /* <Fields> */
264 /* platformID :: The ID of the name's encoding platform. */
265 /* */
266 /* encodingID :: The platform-specific ID for the name's encoding. */
267 /* */
268 /* languageID :: The platform-specific ID for the name's language. */
269 /* */
270 /* nameID :: The ID specifying what kind of name this is. */
271 /* */
272 /* stringLength :: The length of the string in bytes. */
273 /* */
274 /* stringOffset :: The offset to the string in the `name' table. */
275 /* */
276 /* string :: A pointer to the string's bytes. Note that these */
277 /* are usually UTF-16 encoded characters. */
278 /* */
279 typedef struct TT_NameRec_
280 {
281 FT_UShort platformID;
282 FT_UShort encodingID;
283 FT_UShort languageID;
284 FT_UShort nameID;
285 FT_UShort stringLength;
286 FT_UShort stringOffset;
287
288 /* this last field is not defined in the spec */
289 /* but used by the FreeType engine */
290
291 FT_Byte* string;
292
293 } TT_NameRec;
294
295
296 /*************************************************************************/
297 /* */
298 /* <Struct> */
299 /* TT_NameTable */
300 /* */
301 /* <Description> */
302 /* A structure modeling the TrueType name table. */
303 /* */
304 /* <Fields> */
305 /* format :: The format of the name table. */
306 /* */
307 /* numNameRecords :: The number of names in table. */
308 /* */
309 /* storageOffset :: The offset of the name table in the `name' */
310 /* TrueType table. */
311 /* */
312 /* names :: An array of name records. */
313 /* */
314 /* storage :: The names storage area. */
315 /* */
316 typedef struct TT_NameTable_
317 {
318 FT_UShort format;
319 FT_UShort numNameRecords;
320 FT_UShort storageOffset;
321 TT_NameRec* names;
322 FT_Byte* storage;
323
324 } TT_NameTable;
325
326
327 /*************************************************************************/
328 /*************************************************************************/
329 /*************************************************************************/
330 /*** ***/
331 /*** ***/
332 /*** OPTIONAL TRUETYPE/OPENTYPE TABLES DEFINITIONS ***/
333 /*** ***/
334 /*** ***/
335 /*************************************************************************/
336 /*************************************************************************/
337 /*************************************************************************/
338
339
340 /*************************************************************************/
341 /* */
342 /* <Struct> */
343 /* TT_GaspRange */
344 /* */
345 /* <Description> */
346 /* A tiny structure used to model a gasp range according to the */
347 /* TrueType specification. */
348 /* */
349 /* <Fields> */
350 /* maxPPEM :: The maximum ppem value to which `gaspFlag' applies. */
351 /* */
352 /* gaspFlag :: A flag describing the grid-fitting and anti-aliasing */
353 /* modes to be used. */
354 /* */
355 typedef struct TT_GaspRange_
356 {
357 FT_UShort maxPPEM;
358 FT_UShort gaspFlag;
359
360 } TT_GaspRange;
361
362
363 #define TT_GASP_GRIDFIT 0x01
364 #define TT_GASP_DOGRAY 0x02
365
366
367 /*************************************************************************/
368 /* */
369 /* <Struct> */
370 /* TT_Gasp */
371 /* */
372 /* <Description> */
373 /* A structure modeling the TrueType `gasp' table used to specify */
374 /* grid-fitting and anti-aliasing behaviour. */
375 /* */
376 /* <Fields> */
377 /* version :: The version number. */
378 /* */
379 /* numRanges :: The number of gasp ranges in table. */
380 /* */
381 /* gaspRanges :: An array of gasp ranges. */
382 /* */
383 typedef struct TT_Gasp_
384 {
385 FT_UShort version;
386 FT_UShort numRanges;
387 TT_GaspRange* gaspRanges;
388
389 } TT_Gasp;
390
391
392 /*************************************************************************/
393 /* */
394 /* <Struct> */
395 /* TT_HdmxRec */
396 /* */
397 /* <Description> */
398 /* A small structure used to model the pre-computed widths of a given */
399 /* size. They are found in the `hdmx' table. */
400 /* */
401 /* <Fields> */
402 /* ppem :: The pixels per EM value at which these metrics apply. */
403 /* */
404 /* max_width :: The maximum advance width for this metric. */
405 /* */
406 /* widths :: An array of widths. Note: These are 8-bit bytes. */
407 /* */
408 typedef struct TT_HdmxRec_
409 {
410 FT_Byte ppem;
411 FT_Byte max_width;
412 FT_Byte* widths;
413
414 } TT_HdmxRec;
415
416
417 /*************************************************************************/
418 /* */
419 /* <Struct> */
420 /* TT_Hdmx */
421 /* */
422 /* <Description> */
423 /* A structure used to model the `hdmx' table, which contains */
424 /* pre-computed widths for a set of given sizes/dimensions. */
425 /* */
426 /* <Fields> */
427 /* version :: The version number. */
428 /* */
429 /* num_records :: The number of hdmx records. */
430 /* */
431 /* records :: An array of hdmx records. */
432 /* */
433 typedef struct TT_Hdmx_
434 {
435 FT_UShort version;
436 FT_Short num_records;
437 TT_HdmxRec* records;
438
439 } TT_Hdmx;
440
441
442 /*************************************************************************/
443 /* */
444 /* <Struct> */
445 /* TT_Kern_0_Pair */
446 /* */
447 /* <Description> */
448 /* A structure used to model a kerning pair for the kerning table */
449 /* format 0. The engine now loads this table if it finds one in the */
450 /* font file. */
451 /* */
452 /* <Fields> */
453 /* left :: The index of the left glyph in pair. */
454 /* */
455 /* right :: The index of the right glyph in pair. */
456 /* */
457 /* value :: The kerning distance. A positive value spaces the */
458 /* glyphs, a negative one makes them closer. */
459 /* */
460 typedef struct TT_Kern_0_Pair_
461 {
462 FT_UShort left; /* index of left glyph in pair */
463 FT_UShort right; /* index of right glyph in pair */
464 FT_FWord value; /* kerning value */
465
466 } TT_Kern_0_Pair;
467
468
469 /*************************************************************************/
470 /*************************************************************************/
471 /*************************************************************************/
472 /*** ***/
473 /*** ***/
474 /*** EMBEDDED BITMAPS SUPPORT ***/
475 /*** ***/
476 /*** ***/
477 /*************************************************************************/
478 /*************************************************************************/
479 /*************************************************************************/
480
481
482 /*************************************************************************/
483 /* */
484 /* <Struct> */
485 /* TT_SBit_Metrics */
486 /* */
487 /* <Description> */
488 /* A structure used to hold the big metrics of a given glyph bitmap */
489 /* in a TrueType or OpenType font. These are usually found in the */
490 /* `EBDT' (Microsoft) or `bdat' (Apple) table. */
491 /* */
492 /* <Fields> */
493 /* height :: The glyph height in pixels. */
494 /* */
495 /* width :: The glyph width in pixels. */
496 /* */
497 /* horiBearingX :: The horizontal left bearing. */
498 /* */
499 /* horiBearingY :: The horizontal top bearing. */
500 /* */
501 /* horiAdvance :: The horizontal advance. */
502 /* */
503 /* vertBearingX :: The vertical left bearing. */
504 /* */
505 /* vertBearingY :: The vertical top bearing. */
506 /* */
507 /* vertAdvance :: The vertical advance. */
508 /* */
509 typedef struct TT_SBit_Metrics_
510 {
511 FT_Byte height;
512 FT_Byte width;
513
514 FT_Char horiBearingX;
515 FT_Char horiBearingY;
516 FT_Byte horiAdvance;
517
518 FT_Char vertBearingX;
519 FT_Char vertBearingY;
520 FT_Byte vertAdvance;
521
522 } TT_SBit_Metrics;
523
524
525 /*************************************************************************/
526 /* */
527 /* <Struct> */
528 /* TT_SBit_Small_Metrics */
529 /* */
530 /* <Description> */
531 /* A structure used to hold the small metrics of a given glyph bitmap */
532 /* in a TrueType or OpenType font. These are usually found in the */
533 /* `EBDT' (Microsoft) or the `bdat' (Apple) table. */
534 /* */
535 /* <Fields> */
536 /* height :: The glyph height in pixels. */
537 /* */
538 /* width :: The glyph width in pixels. */
539 /* */
540 /* bearingX :: The left-side bearing. */
541 /* */
542 /* bearingY :: The top-side bearing. */
543 /* */
544 /* advance :: The advance width or height. */
545 /* */
546 typedef struct TT_SBit_Small_Metrics_
547 {
548 FT_Byte height;
549 FT_Byte width;
550
551 FT_Char bearingX;
552 FT_Char bearingY;
553 FT_Byte advance;
554
555 } TT_SBit_Small_Metrics;
556
557
558 /*************************************************************************/
559 /* */
560 /* <Struct> */
561 /* TT_SBit_Line_Metrics */
562 /* */
563 /* <Description> */
564 /* A structure used to describe the text line metrics of a given */
565 /* bitmap strike, for either a horizontal or vertical layout. */
566 /* */
567 /* <Fields> */
568 /* ascender :: The ascender in pixels. */
569 /* */
570 /* descender :: The descender in pixels. */
571 /* */
572 /* max_width :: The maximum glyph width in pixels. */
573 /* */
574 /* caret_slope_enumerator :: Rise of the caret slope, typically set */
575 /* to 1 for non-italic fonts. */
576 /* */
577 /* caret_slope_denominator :: Rise of the caret slope, typically set */
578 /* to 0 for non-italic fonts. */
579 /* */
580 /* caret_offset :: Offset in pixels to move the caret for */
581 /* proper positioning. */
582 /* */
583 /* min_origin_SB :: Minimum of horiBearingX (resp. */
584 /* vertBearingY). */
585 /* min_advance_SB :: Minimum of */
586 /* */
587 /* horizontal advance - */
588 /* ( horiBearingX + width ) */
589 /* */
590 /* resp. */
591 /* */
592 /* vertical advance - */
593 /* ( vertBearingY + height ) */
594 /* */
595 /* max_before_BL :: Maximum of horiBearingY (resp. */
596 /* vertBearingY). */
597 /* */
598 /* min_after_BL :: Minimum of */
599 /* */
600 /* horiBearingY - height */
601 /* */
602 /* resp. */
603 /* */
604 /* vertBearingX - width */
605 /* */
606 /* pads :: Unused (to make the size of the record */
607 /* a multiple of 32 bits. */
608 /* */
609 typedef struct TT_SBit_Line_Metrics_
610 {
611 FT_Char ascender;
612 FT_Char descender;
613 FT_Byte max_width;
614 FT_Char caret_slope_numerator;
615 FT_Char caret_slope_denominator;
616 FT_Char caret_offset;
617 FT_Char min_origin_SB;
618 FT_Char min_advance_SB;
619 FT_Char max_before_BL;
620 FT_Char min_after_BL;
621 FT_Char pads[2];
622
623 } TT_SBit_Line_Metrics;
624
625
626 /*************************************************************************/
627 /* */
628 /* <Struct> */
629 /* TT_SBit_Range */
630 /* */
631 /* <Description> */
632 /* A TrueType/OpenType subIndexTable as defined in the `EBLC' */
633 /* (Microsoft) or `bloc' (Apple) tables. */
634 /* */
635 /* <Fields> */
636 /* first_glyph :: The first glyph index in the range. */
637 /* */
638 /* last_glyph :: The last glyph index in the range. */
639 /* */
640 /* index_format :: The format of index table. Valid values are 1 */
641 /* to 5. */
642 /* */
643 /* image_format :: The format of `EBDT' image data. */
644 /* */
645 /* image_offset :: The offset to image data in `EBDT'. */
646 /* */
647 /* image_size :: For index formats 2 and 5. This is the size in */
648 /* bytes of each glyph bitmap. */
649 /* */
650 /* big_metrics :: For index formats 2 and 5. This is the big */
651 /* metrics for each glyph bitmap. */
652 /* */
653 /* num_glyphs :: For index formats 4 and 5. This is the number of */
654 /* glyphs in the code array. */
655 /* */
656 /* glyph_offsets :: For index formats 1 and 3. */
657 /* */
658 /* glyph_codes :: For index formats 4 and 5. */
659 /* */
660 /* table_offset :: The offset of the index table in the `EBLC' */
661 /* table. Only used during strike loading. */
662 /* */
663 typedef struct TT_SBit_Range
664 {
665 FT_UShort first_glyph;
666 FT_UShort last_glyph;
667
668 FT_UShort index_format;
669 FT_UShort image_format;
670 FT_ULong image_offset;
671
672 FT_ULong image_size;
673 TT_SBit_Metrics metrics;
674 FT_ULong num_glyphs;
675
676 FT_ULong* glyph_offsets;
677 FT_UShort* glyph_codes;
678
679 FT_ULong table_offset;
680
681 } TT_SBit_Range;
682
683
684 /*************************************************************************/
685 /* */
686 /* <Struct> */
687 /* TT_SBit_Strike */
688 /* */
689 /* <Description> */
690 /* A structure used describe a given bitmap strike in the `EBLC' */
691 /* (Microsoft) or `bloc' (Apple) tables. */
692 /* */
693 /* <Fields> */
694 /* num_index_ranges :: The number of index ranges. */
695 /* */
696 /* index_ranges :: An array of glyph index ranges. */
697 /* */
698 /* color_ref :: Unused. A color reference? */
699 /* */
700 /* hori :: The line metrics for horizontal layouts. */
701 /* */
702 /* vert :: The line metrics for vertical layouts. */
703 /* */
704 /* start_glyph :: The lowest glyph index for this strike. */
705 /* */
706 /* end_glyph :: The highest glyph index for this strike. */
707 /* */
708 /* x_ppem :: The number of horizontal pixels per EM. */
709 /* */
710 /* y_ppem :: The number of vertical pixels per EM. */
711 /* */
712 /* bit_depth :: The bit depth. Valid values are 1, 2, 4, */
713 /* and 8. */
714 /* */
715 /* flags :: Is this a vertical or horizontal strike? */
716 /* */
717 typedef struct TT_SBit_Strike_
718 {
719 FT_Int num_ranges;
720 TT_SBit_Range* sbit_ranges;
721 FT_ULong ranges_offset;
722
723 FT_ULong color_ref;
724
725 TT_SBit_Line_Metrics hori;
726 TT_SBit_Line_Metrics vert;
727
728 FT_UShort start_glyph;
729 FT_UShort end_glyph;
730
731 FT_Byte x_ppem;
732 FT_Byte y_ppem;
733
734 FT_Byte bit_depth;
735 FT_Char flags;
736
737 } TT_SBit_Strike;
738
739
740 /*************************************************************************/
741 /* */
742 /* <Struct> */
743 /* TT_SBit_Component */
744 /* */
745 /* <Description> */
746 /* A simple structure to describe a compound sbit element. */
747 /* */
748 /* <Fields> */
749 /* glyph_code :: The element's glyph index. */
750 /* */
751 /* x_offset :: The element's left bearing. */
752 /* */
753 /* y_offset :: The element's top bearing. */
754 /* */
755 typedef struct TT_SBit_Component_
756 {
757 FT_UShort glyph_code;
758
759 FT_Char x_offset;
760 FT_Char y_offset;
761
762 } TT_SBit_Component;
763
764
765 /*************************************************************************/
766 /* */
767 /* <Struct> */
768 /* TT_SBit_Scale */
769 /* */
770 /* <Description> */
771 /* A structure used describe a given bitmap scaling table, as defined */
772 /* in the `EBSC' table. */
773 /* */
774 /* <Fields> */
775 /* hori :: The horizontal line metrics. */
776 /* */
777 /* vert :: The vertical line metrics. */
778 /* */
779 /* x_ppem :: The number of horizontal pixels per EM. */
780 /* */
781 /* y_ppem :: The number of vertical pixels per EM. */
782 /* */
783 /* x_ppem_substitute :: Substitution x_ppem value. */
784 /* */
785 /* y_ppem_substitute :: Substitution y_ppem value. */
786 /* */
787 typedef struct TT_SBit_Scale_
788 {
789 TT_SBit_Line_Metrics hori;
790 TT_SBit_Line_Metrics vert;
791
792 FT_Byte x_ppem;
793 FT_Byte y_ppem;
794
795 FT_Byte x_ppem_substitute;
796 FT_Byte y_ppem_substitute;
797
798 } TT_SBit_Scale;
799
800
801 /*************************************************************************/
802 /*************************************************************************/
803 /*************************************************************************/
804 /*** ***/
805 /*** ***/
806 /*** POSTSCRIPT GLYPH NAMES SUPPORT ***/
807 /*** ***/
808 /*** ***/
809 /*************************************************************************/
810 /*************************************************************************/
811 /*************************************************************************/
812
813
814 /*************************************************************************/
815 /* */
816 /* <Struct> */
817 /* TT_Post_20 */
818 /* */
819 /* <Description> */
820 /* Postscript names sub-table, format 2.0. Stores the PS name of */
821 /* each glyph in the font face. */
822 /* */
823 /* <Fields> */
824 /* num_glyphs :: The number of named glyphs in the table. */
825 /* */
826 /* num_names :: The number of PS names stored in the table. */
827 /* */
828 /* glyph_indices :: The indices of the glyphs in the names arrays. */
829 /* */
830 /* glyph_names :: The PS names not in Mac Encoding. */
831 /* */
832 typedef struct TT_Post_20_
833 {
834 FT_UShort num_glyphs;
835 FT_UShort num_names;
836 FT_UShort* glyph_indices;
837 FT_Char** glyph_names;
838
839 } TT_Post_20;
840
841
842 /*************************************************************************/
843 /* */
844 /* <Struct> */
845 /* TT_Post_25 */
846 /* */
847 /* <Description> */
848 /* Postscript names sub-table, format 2.5. Stores the PS name of */
849 /* each glyph in the font face. */
850 /* */
851 /* <Fields> */
852 /* num_glyphs :: The number of glyphs in the table. */
853 /* */
854 /* offsets :: An array of signed offsets in a normal Mac */
855 /* Postscript name encoding. */
856 /* */
857 typedef struct TT_Post_25_
858 {
859 FT_UShort num_glyphs;
860 FT_Char* offsets;
861
862 } TT_Post_25;
863
864
865 /*************************************************************************/
866 /* */
867 /* <Struct> */
868 /* TT_Post_Names */
869 /* */
870 /* <Description> */
871 /* Postscript names table, either format 2.0 or 2.5. */
872 /* */
873 /* <Fields> */
874 /* loaded :: A flag to indicate whether the PS names are loaded. */
875 /* */
876 /* format_20 :: The sub-table used for format 2.0. */
877 /* */
878 /* format_25 :: The sub-table used for format 2.5. */
879 /* */
880 typedef struct TT_Post_Names_
881 {
882 FT_Bool loaded;
883
884 union
885 {
886 TT_Post_20 format_20;
887 TT_Post_25 format_25;
888
889 } names;
890
891 } TT_Post_Names;
892
893
894 /*************************************************************************/
895 /*************************************************************************/
896 /*************************************************************************/
897 /*** ***/
898 /*** ***/
899 /*** TRUETYPE CHARMAPS SUPPORT ***/
900 /*** ***/
901 /*** ***/
902 /*************************************************************************/
903 /*************************************************************************/
904 /*************************************************************************/
905
906
907 /* format 0 */
908
909 typedef struct TT_CMap0_
910 {
911 FT_Byte* glyphIdArray;
912
913 } TT_CMap0;
914
915
916 /* format 2 */
917
918 typedef struct TT_CMap2SubHeader_
919 {
920 FT_UShort firstCode; /* first valid low byte */
921 FT_UShort entryCount; /* number of valid low bytes */
922 FT_Short idDelta; /* delta value to glyphIndex */
923 FT_UShort idRangeOffset; /* offset from here to 1st code */
924
925 } TT_CMap2SubHeader;
926
927
928 typedef struct TT_CMap2_
929 {
930 FT_UShort* subHeaderKeys;
931 /* high byte mapping table */
932 /* value = subHeader index * 8 */
933
934 TT_CMap2SubHeader* subHeaders;
935 FT_UShort* glyphIdArray;
936 FT_UShort numGlyphId; /* control value */
937
938 } TT_CMap2;
939
940
941 /* format 4 */
942
943 typedef struct TT_CMap4Segment_
944 {
945 FT_UShort endCount;
946 FT_UShort startCount;
947 FT_Short idDelta;
948 FT_UShort idRangeOffset;
949
950 } TT_CMap4Segment;
951
952
953 typedef struct TT_CMap4_
954 {
955 FT_UShort segCountX2; /* number of segments * 2 */
956 FT_UShort searchRange; /* these parameters can be used */
957 FT_UShort entrySelector; /* for a binary search */
958 FT_UShort rangeShift;
959
960 TT_CMap4Segment* segments;
961 FT_UShort* glyphIdArray;
962 FT_UShort numGlyphId; /* control value */
963
964 TT_CMap4Segment* last_segment; /* last used segment; this is a small */
965 /* cache to potentially increase speed */
966 } TT_CMap4;
967
968
969 /* format 6 */
970
971 typedef struct TT_CMap6_
972 {
973 FT_UShort firstCode; /* first character code of subrange */
974 FT_UShort entryCount; /* number of character codes in subrange */
975
976 FT_UShort* glyphIdArray;
977
978 } TT_CMap6;
979
980
981 typedef struct TT_CMapTable_ TT_CMapTable;
982
983
984 typedef
985 FT_UInt (*TT_CharMap_Func)( TT_CMapTable* charmap,
986 FT_ULong char_code );
987
988
989 /* charmap table */
990 struct TT_CMapTable_
991 {
992 FT_UShort platformID;
993 FT_UShort platformEncodingID;
994 FT_UShort format;
995 FT_UShort length;
996 FT_UShort version;
997
998 FT_Bool loaded;
999 FT_ULong offset;
1000
1001 union
1002 {
1003 TT_CMap0 cmap0;
1004 TT_CMap2 cmap2;
1005 TT_CMap4 cmap4;
1006 TT_CMap6 cmap6;
1007 } c;
1008
1009 TT_CharMap_Func get_index;
1010 };
1011
1012
1013 /*************************************************************************/
1014 /* */
1015 /* <Struct> */
1016 /* TT_CharMapRec */
1017 /* */
1018 /* <Description> */
1019 /* The TrueType character map object type. */
1020 /* */
1021 /* <Fields> */
1022 /* root :: The parent character map structure. */
1023 /* */
1024 /* cmap :: The used character map. */
1025 /* */
1026 typedef struct TT_CharMapRec_
1027 {
1028 FT_CharMapRec root;
1029 TT_CMapTable cmap;
1030
1031 } TT_CharMapRec;
1032
1033
1034 /*************************************************************************/
1035 /*************************************************************************/
1036 /*************************************************************************/
1037 /*** ***/
1038 /*** ***/
1039 /*** ORIGINAL TT_FACE CLASS DEFINITION ***/
1040 /*** ***/
1041 /*** ***/
1042 /*************************************************************************/
1043 /*************************************************************************/
1044 /*************************************************************************/
1045
1046
1047 /*************************************************************************/
1048 /* */
1049 /* This structure/class is defined here because it is common to the */
1050 /* following formats: TTF, OpenType-TT, and OpenType-CFF. */
1051 /* */
1052 /* Note, however, that the classes TT_Size, TT_GlyphSlot, and TT_CharMap */
1053 /* are not shared between font drivers, and are thus defined normally in */
1054 /* `ttobjs.h'. */
1055 /* */
1056 /*************************************************************************/
1057
1058
1059 /*************************************************************************/
1060 /* */
1061 /* <Type> */
1062 /* TT_Face */
1063 /* */
1064 /* <Description> */
1065 /* A handle to a TrueType face/font object. A TT_Face encapsulates */
1066 /* the resolution and scaling independent parts of a TrueType font */
1067 /* resource. */
1068 /* */
1069 /* <Note> */
1070 /* The TT_Face structure is also used as a `parent class' for the */
1071 /* OpenType-CFF class (T2_Face). */
1072 /* */
1073 typedef struct TT_FaceRec_* TT_Face;
1074
1075
1076 /*************************************************************************/
1077 /* */
1078 /* <Type> */
1079 /* TT_CharMap */
1080 /* */
1081 /* <Description> */
1082 /* A handle to a TrueType character mapping object. */
1083 /* */
1084 typedef struct TT_CharMapRec_* TT_CharMap;
1085
1086
1087 /* a function type used for the truetype bytecode interpreter hooks */
1088 typedef FT_Error (*TT_Interpreter)( void* exec_context );
1089
1090 /* forward declaration */
1091 typedef struct TT_Loader_ TT_Loader;
1092
1093
1094 /*************************************************************************/
1095 /* */
1096 /* <FuncType> */
1097 /* TT_Goto_Table_Func */
1098 /* */
1099 /* <Description> */
1100 /* Seeks a stream to the start of a given TrueType table. */
1101 /* */
1102 /* <Input> */
1103 /* face :: A handle to the target face object. */
1104 /* */
1105 /* tag :: A 4-byte tag used to name the table. */
1106 /* */
1107 /* stream :: The input stream. */
1108 /* */
1109 /* <Output> */
1110 /* length :: The length of the table in bytes. Set to 0 if not */
1111 /* needed. */
1112 /* */
1113 /* <Return> */
1114 /* FreeType error code. 0 means success. */
1115 /* */
1116 /* <Note> */
1117 /* The stream cursor must be at the font file's origin. */
1118 /* */
1119 typedef
1120 FT_Error (*TT_Goto_Table_Func)( TT_Face face,
1121 FT_ULong tag,
1122 FT_Stream stream,
1123 FT_ULong* length );
1124
1125
1126 /*************************************************************************/
1127 /* */
1128 /* <FuncType> */
1129 /* TT_Access_Glyph_Frame_Func */
1130 /* */
1131 /* <Description> */
1132 /* Seeks a stream to the start of a given glyph element, and opens a */
1133 /* frame for it. */
1134 /* */
1135 /* <Input> */
1136 /* loader :: The current TrueType glyph loader object. */
1137 /* */
1138 /* glyph index :: The index of the glyph to access. */
1139 /* */
1140 /* offset :: The offset of the glyph according to the */
1141 /* `locations' table. */
1142 /* */
1143 /* byte_count :: The size of the frame in bytes. */
1144 /* */
1145 /* <Return> */
1146 /* FreeType error code. 0 means success. */
1147 /* */
1148 /* <Note> */
1149 /* This function is normally equivalent to FILE_Seek(offset) */
1150 /* followed by ACCESS_Frame(byte_count) with the loader's stream, but */
1151 /* alternative formats (e.g. compressed ones) might use something */
1152 /* different. */
1153 /* */
1154 typedef
1155 FT_Error (*TT_Access_Glyph_Frame_Func)( TT_Loader* loader,
1156 FT_UInt glyph_index,
1157 FT_ULong offset,
1158 FT_UInt byte_count );
1159
1160
1161 /*************************************************************************/
1162 /* */
1163 /* <FuncType> */
1164 /* TT_Load_Glyph_Element_Func */
1165 /* */
1166 /* <Description> */
1167 /* Reads one glyph element (its header, a simple glyph, or a */
1168 /* composite) from the loader's current stream frame. */
1169 /* */
1170 /* <Input> */
1171 /* loader :: The current TrueType glyph loader object. */
1172 /* */
1173 /* <Return> */
1174 /* FreeType error code. 0 means success. */
1175 /* */
1176 typedef
1177 FT_Error (*TT_Load_Glyph_Element_Func)( TT_Loader* loader );
1178
1179
1180 /*************************************************************************/
1181 /* */
1182 /* <FuncType> */
1183 /* TT_Forget_Glyph_Frame_Func */
1184 /* */
1185 /* <Description> */
1186 /* Closes the current loader stream frame for the glyph. */
1187 /* */
1188 /* <Input> */
1189 /* loader :: The current TrueType glyph loader object. */
1190 /* */
1191 typedef
1192 void (*TT_Forget_Glyph_Frame_Func)( TT_Loader* loader );
1193
1194
1195
1196 /*************************************************************************/
1197 /* */
1198 /* TrueType Face Type */
1199 /* */
1200 /* <Struct> */
1201 /* TT_Face */
1202 /* */
1203 /* <Description> */
1204 /* The TrueType face class. These objects model the resolution and */
1205 /* point-size independent data found in a TrueType font file. */
1206 /* */
1207 /* <Fields> */
1208 /* root :: The base FT_Face structure, managed by the */
1209 /* base layer. */
1210 /* */
1211 /* ttc_header :: The TrueType collection header, used when */
1212 /* the file is a `ttc' rather than a `ttf'. */
1213 /* For ordinary font files, the field */
1214 /* `ttc_header.count' is set to 0. */
1215 /* */
1216 /* format_tag :: The font format tag. */
1217 /* */
1218 /* num_tables :: The number of TrueType tables in this font */
1219 /* file. */
1220 /* */
1221 /* dir_tables :: The directory of TrueType tables for this */
1222 /* font file. */
1223 /* */
1224 /* header :: The font's font header (`head' table). */
1225 /* Read on font opening. */
1226 /* */
1227 /* horizontal :: The font's horizontal header (`hhea' */
1228 /* table). This field also contains the */
1229 /* associated horizontal metrics table */
1230 /* (`hmtx'). */
1231 /* */
1232 /* max_profile :: The font's maximum profile table. Read on */
1233 /* font opening. Note that some maximum */
1234 /* values cannot be taken directly from this */
1235 /* table. We thus define additional fields */
1236 /* below to hold the computed maxima. */
1237 /* */
1238 /* max_components :: The maximum number of glyph components */
1239 /* required to load any composite glyph from */
1240 /* this font. Used to size the load stack. */
1241 /* */
1242 /* vertical_info :: A boolean which is set when the font file */
1243 /* contains vertical metrics. If not, the */
1244 /* value of the `vertical' field is */
1245 /* undefined. */
1246 /* */
1247 /* vertical :: The font's vertical header (`vhea' table). */
1248 /* This field also contains the associated */
1249 /* vertical metrics table (`vmtx'), if found. */
1250 /* IMPORTANT: The contents of this field is */
1251 /* undefined if the `verticalInfo' field is */
1252 /* unset. */
1253 /* */
1254 /* num_names :: The number of name records within this */
1255 /* TrueType font. */
1256 /* */
1257 /* name_table :: The table of name records (`name'). */
1258 /* */
1259 /* os2 :: The font's OS/2 table (`OS/2'). */
1260 /* */
1261 /* postscript :: The font's PostScript table (`post' */
1262 /* table). The PostScript glyph names are */
1263 /* not loaded by the driver on face opening. */
1264 /* See the `ttpost' module for more details. */
1265 /* */
1266 /* num_charmaps :: The number of character mappings in the */
1267 /* font. */
1268 /* */
1269 /* charmaps :: The array of charmap objects for this font */
1270 /* file. Note that this field is a typeless */
1271 /* pointer. The Reason is that the format of */
1272 /* charmaps varies with the underlying font */
1273 /* format and cannot be determined here. */
1274 /* */
1275 /* goto_table :: A function called by each TrueType table */
1276 /* loader to position a stream's cursor to */
1277 /* the start of a given table according to */
1278 /* its tag. It defaults to TT_Goto_Face but */
1279 /* can be different for strange formats (e.g. */
1280 /* Type 42). */
1281 /* */
1282 /* access_glyph_frame :: XXX */
1283 /* */
1284 /* read_glyph_header :: XXX */
1285 /* */
1286 /* read_simple_glyph :: XXX */
1287 /* */
1288 /* read_composite_glyph :: XXX */
1289 /* */
1290 /* forget_glyph_frame :: XXX */
1291 /* */
1292 /* sfnt :: A pointer to the SFNT `driver' interface. */
1293 /* */
1294 /* psnames :: A pointer to the `PSNames' module */
1295 /* interface. */
1296 /* */
1297 /* hdmx :: The face's horizontal device metrics */
1298 /* (`hdmx' table). This table is optional in */
1299 /* TrueType/OpenType fonts. */
1300 /* */
1301 /* gasp :: The grid-fitting and scaling properties */
1302 /* table (`gasp'). This table is optional in */
1303 /* TrueType/OpenType fonts. */
1304 /* */
1305 /* pclt :: XXX */
1306 /* */
1307 /* num_sbit_strikes :: The number of sbit strikes, i.e., bitmap */
1308 /* sizes, embedded in this font. */
1309 /* */
1310 /* sbit_strikes :: An array of sbit strikes embedded in this */
1311 /* font. This table is optional in a */
1312 /* TrueType/OpenType font. */
1313 /* */
1314 /* num_sbit_scales :: The number of sbit scales for this font. */
1315 /* */
1316 /* sbit_scales :: Array of sbit scales embedded in this */
1317 /* font. This table is optional in a */
1318 /* TrueType/OpenType font. */
1319 /* */
1320 /* postscript_names :: A table used to store the Postscript names */
1321 /* of the glyphs for this font. See the */
1322 /* file `ttconfig.h' for comments on the */
1323 /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES option. */
1324 /* */
1325 /* num_locations :: The number of glyph locations in this */
1326 /* TrueType file. This should be */
1327 /* identical to the number of glyphs. */
1328 /* Ignored for Type 2 fonts. */
1329 /* */
1330 /* glyph_locations :: An array of longs. These are offsets to */
1331 /* glyph data within the `glyf' table. */
1332 /* Ignored for Type 2 font faces. */
1333 /* */
1334 /* font_program_size :: Size in bytecodes of the face's font */
1335 /* program. 0 if none defined. Ignored for */
1336 /* Type 2 fonts. */
1337 /* */
1338 /* font_program :: The face's font program (bytecode stream) */
1339 /* executed at load time, also used during */
1340 /* glyph rendering. Comes from the `fpgm' */
1341 /* table. Ignored for Type 2 font fonts. */
1342 /* */
1343 /* cvt_program_size :: The size in bytecodes of the face's cvt */
1344 /* program. Ignored for Type 2 fonts. */
1345 /* */
1346 /* cvt_program :: The face's cvt program (bytecode stream) */
1347 /* executed each time an instance/size is */
1348 /* changed/reset. Comes from the `prep' */
1349 /* table. Ignored for Type 2 fonts. */
1350 /* */
1351 /* cvt_size :: Size of the control value table (in */
1352 /* entries). Ignored for Type 2 fonts. */
1353 /* */
1354 /* cvt :: The face's original control value table. */
1355 /* Coordinates are expressed in unscaled font */
1356 /* units. Comes from the `cvt ' table. */
1357 /* Ignored for Type 2 fonts. */
1358 /* */
1359 /* num_kern_pairs :: The number of kerning pairs present in the */
1360 /* font file. The engine only loads the */
1361 /* first horizontal format 0 kern table it */
1362 /* finds in the font file. You should use */
1363 /* the `ttxkern' structures if you want to */
1364 /* access other kerning tables. Ignored */
1365 /* for Type 2 fonts. */
1366 /* */
1367 /* kern_table_index :: The index of the kerning table in the font */
1368 /* kerning directory. Only used by the */
1369 /* ttxkern extension to avoid data */
1370 /* duplication. Ignored for Type 2 fonts. */
1371 /* */
1372 /* interpreter :: A pointer to the TrueType bytecode */
1373 /* interpreters field is also used to hook */
1374 /* the debugger in `ttdebug'. */
1375 /* */
1376 /* extra :: XXX */
1377 /* */
1378 typedef struct TT_FaceRec_
1379 {
1380 FT_FaceRec root;
1381
1382 TTC_Header ttc_header;
1383
1384 FT_ULong format_tag;
1385 FT_UShort num_tables;
1386 TT_Table* dir_tables;
1387
1388 TT_Header header; /* TrueType header table */
1389 TT_HoriHeader horizontal; /* TrueType horizontal header */
1390
1391 TT_MaxProfile max_profile;
1392 FT_ULong max_components;
1393
1394 FT_Bool vertical_info;
1395 TT_VertHeader vertical; /* TT Vertical header, if present */
1396
1397 FT_Int num_names; /* number of name records */
1398 TT_NameTable name_table; /* name table */
1399
1400 TT_OS2 os2; /* TrueType OS/2 table */
1401 TT_Postscript postscript; /* TrueType Postscript table */
1402
1403 FT_Int num_charmaps;
1404 TT_CharMap charmaps; /* array of TT_CharMapRec */
1405
1406 TT_Goto_Table_Func goto_table;
1407
1408 TT_Access_Glyph_Frame_Func access_glyph_frame;
1409 TT_Load_Glyph_Element_Func read_glyph_header;
1410 TT_Load_Glyph_Element_Func read_simple_glyph;
1411 TT_Load_Glyph_Element_Func read_composite_glyph;
1412 TT_Forget_Glyph_Frame_Func forget_glyph_frame;
1413
1414 /* a typeless pointer to the SFNT_Interface table used to load */
1415 /* the basic TrueType tables in the face object */
1416 void* sfnt;
1417
1418 /* a typeless pointer to the PSNames_Interface table used to */
1419 /* handle glyph names <-> unicode & Mac values */
1420 void* psnames;
1421
1422 /***********************************************************************/
1423 /* */
1424 /* Optional TrueType/OpenType tables */
1425 /* */
1426 /***********************************************************************/
1427
1428 /* horizontal device metrics */
1429 TT_Hdmx hdmx;
1430
1431 /* grid-fitting and scaling table */
1432 TT_Gasp gasp; /* the `gasp' table */
1433
1434 /* PCL 5 table */
1435 TT_PCLT pclt;
1436
1437 /* embedded bitmaps support */
1438 FT_Int num_sbit_strikes;
1439 TT_SBit_Strike* sbit_strikes;
1440
1441 FT_Int num_sbit_scales;
1442 TT_SBit_Scale* sbit_scales;
1443
1444 /* postscript names table */
1445 TT_Post_Names postscript_names;
1446
1447
1448 /***********************************************************************/
1449 /* */
1450 /* TrueType-specific fields (ignored by the OTF-Type2 driver) */
1451 /* */
1452 /***********************************************************************/
1453
1454 /* the glyph locations */
1455 FT_UShort num_locations;
1456 FT_Long* glyph_locations;
1457
1458 /* the font program, if any */
1459 FT_ULong font_program_size;
1460 FT_Byte* font_program;
1461
1462 /* the cvt program, if any */
1463 FT_ULong cvt_program_size;
1464 FT_Byte* cvt_program;
1465
1466 /* the original, unscaled, control value table */
1467 FT_ULong cvt_size;
1468 FT_Short* cvt;
1469
1470 /* the format 0 kerning table, if any */
1471 FT_Int num_kern_pairs;
1472 FT_Int kern_table_index;
1473 TT_Kern_0_Pair* kern_pairs;
1474
1475 /* A pointer to the bytecode interpreter to use. This is also */
1476 /* used to hook the debugger for the `ttdebug' utility. */
1477 TT_Interpreter interpreter;
1478
1479
1480 /***********************************************************************/
1481 /* */
1482 /* Other tables or fields. This is used by derivative formats like */
1483 /* OpenType. */
1484 /* */
1485 /***********************************************************************/
1486
1487 FT_Generic extra;
1488
1489 } TT_FaceRec;
1490
1491
1492 /*************************************************************************/
1493 /* */
1494 /* <Struct> */
1495 /* TT_GlyphZone */
1496 /* */
1497 /* <Description> */
1498 /* A glyph zone is used to load, scale and hint glyph outline */
1499 /* coordinates. */
1500 /* */
1501 /* <Fields> */
1502 /* memory :: A handle to the memory manager. */
1503 /* */
1504 /* max_points :: The maximal size in points of the zone. */
1505 /* */
1506 /* max_contours :: Max size in links contours of thez one. */
1507 /* */
1508 /* n_points :: The current number of points in the zone. */
1509 /* */
1510 /* n_contours :: The current number of contours in the zone. */
1511 /* */
1512 /* org :: The original glyph coordinates (font */
1513 /* units/scaled). */
1514 /* */
1515 /* cur :: The current glyph coordinates (scaled/hinted). */
1516 /* */
1517 /* tags :: The point control tags. */
1518 /* */
1519 /* contours :: The contours end points. */
1520 /* */
1521 typedef struct TT_GlyphZone_
1522 {
1523 FT_Memory memory;
1524 FT_UShort max_points;
1525 FT_UShort max_contours;
1526 FT_UShort n_points; /* number of points in zone */
1527 FT_Short n_contours; /* number of contours */
1528
1529 FT_Vector* org; /* original point coordinates */
1530 FT_Vector* cur; /* current point coordinates */
1531
1532 FT_Byte* tags; /* current touch flags */
1533 FT_UShort* contours; /* contour end points */
1534
1535 } TT_GlyphZone;
1536
1537
1538 /* handle to execution context */
1539 typedef struct TT_ExecContextRec_* TT_ExecContext;
1540
1541 /* glyph loader structure */
1542 struct TT_Loader_
1543 {
1544 FT_Face face;
1545 FT_Size size;
1546 FT_GlyphSlot glyph;
1547 FT_GlyphLoader* gloader;
1548
1549 FT_ULong load_flags;
1550 FT_UInt glyph_index;
1551
1552 FT_Stream stream;
1553 FT_Int byte_len;
1554
1555 FT_Short n_contours;
1556 FT_BBox bbox;
1557 FT_Int left_bearing;
1558 FT_Int advance;
1559 FT_Bool preserve_pps;
1560 FT_Vector pp1;
1561 FT_Vector pp2;
1562
1563 FT_ULong glyf_offset;
1564
1565 /* the zone where we load our glyphs */
1566 TT_GlyphZone base;
1567 TT_GlyphZone zone;
1568
1569 TT_ExecContext exec;
1570 FT_Byte* instructions;
1571 FT_ULong ins_pos;
1572
1573 /* for possible extensibility in other formats */
1574 void* other;
1575
1576 };
1577
1578
1579 #endif /* TTTYPES_H */
1580
1581
1582 /* END */
wxWidgets (Impactor)