2729eafc |
1 | /* |
2 | * Support for sfnt-housed fonts for Halibut |
3 | * |
4 | * sfnt-housed fonts include TrueType, OpenType, sfnt-housed Type 1 |
5 | * fonts and a couple of bitmap formats. |
6 | * |
7 | * The various tables that can appear in sfnt-housed fonts are defined |
8 | * in several places. These include: |
9 | * |
10 | * The OpenType Specification: |
11 | * <http://partners.adobe.com/public/developer/opentype/index_spec.html> |
12 | * |
13 | * The TrueType Reference Manual: |
14 | * <http://developer.apple.com/textfonts/TTRefMan/> |
15 | */ |
16 | |
17 | #include <assert.h> |
18 | #include <stddef.h> |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
21 | #include "halibut.h" |
22 | #include "paper.h" |
23 | |
24 | typedef struct sfnt_decode_Tag sfnt_decode; |
25 | struct sfnt_decode_Tag { |
26 | void (*decoder)(void *src, void *dest); |
27 | size_t src_len; |
28 | size_t dest_offset; |
29 | }; |
30 | |
18e7663a |
31 | #if 0 /* unused */ |
2729eafc |
32 | static void decode_uint8(void *src, void *dest) { |
33 | *(unsigned int *)dest = *(unsigned char *)src; |
34 | } |
35 | #define d_uint8 decode_uint8, 1 |
18e7663a |
36 | #endif |
2729eafc |
37 | |
18e7663a |
38 | #if 0 /* unused */ |
2729eafc |
39 | static void decode_int8(void *src, void *dest) { |
40 | *(int *)dest = *(signed char *)src; |
41 | } |
42 | #define d_int8 decode_int8, 1 |
18e7663a |
43 | #endif |
2729eafc |
44 | |
45 | static void decode_uint16(void *src, void *dest) { |
46 | unsigned char *cp = src; |
47 | *(unsigned int *)dest = (cp[0] << 8) + cp[1]; |
48 | } |
49 | #define d_uint16 decode_uint16, 2 |
50 | |
51 | static void decode_int16(void *src, void *dest) { |
52 | signed char *cp = src; |
53 | unsigned char *ucp = src; |
54 | *(int *)dest = (cp[0] << 8) + ucp[1]; |
55 | } |
56 | #define d_int16 decode_int16, 2 |
57 | |
58 | static void decode_uint32(void *src, void *dest) { |
59 | unsigned char *cp = src; |
60 | *(unsigned int *)dest = |
61 | (cp[0] << 24) + (cp[1] << 16) + (cp[2] << 8) + cp[3]; |
62 | } |
63 | #define d_uint32 decode_uint32, 4 |
64 | |
65 | static void decode_int32(void *src, void *dest) { |
66 | signed char *cp = src; |
67 | unsigned char *ucp = src; |
68 | *(int *)dest = (cp[0] << 24) + (ucp[1] << 16) + (ucp[2] << 8) + ucp[3]; |
69 | } |
70 | #define d_int32 decode_int32, 4 |
71 | |
72 | static void decode_skip(void *src, void *dest) { |
18e7663a |
73 | IGNORE(src); |
74 | IGNORE(dest); |
2729eafc |
75 | /* do nothing */ |
76 | } |
77 | #define d_skip(n) decode_skip, (n), 0 |
78 | |
79 | static void decode_end(void *src, void *dest) { |
18e7663a |
80 | IGNORE(src); |
81 | IGNORE(dest); |
2729eafc |
82 | /* never called */ |
83 | } |
84 | #define d_end decode_end, 0, 0 |
85 | |
86 | static void *decode(sfnt_decode *dec, void *src, void *end, void *dest) { |
87 | while (dec->decoder != decode_end) { |
88 | if ((char *)src + dec->src_len > (char *)end) return NULL; |
89 | dec->decoder(src, (char *)dest + dec->dest_offset); |
90 | src = (char *)src + dec->src_len; |
91 | dec++; |
92 | } |
93 | return src; |
94 | } |
95 | |
96 | static void *decoden(sfnt_decode *dec, void *src, void *end, void *dest, |
97 | size_t size, size_t n) { |
98 | while (n-- && src) { |
99 | src = decode(dec, src, end, dest); |
100 | dest = (char *)dest + size; |
101 | } |
102 | return src; |
103 | } |
104 | |
105 | /* Decoding specs for simple data types */ |
106 | sfnt_decode uint16_decode[] = { { d_uint16, 0 }, { d_end } }; |
107 | sfnt_decode int16_decode[] = { { d_int16, 0 }, { d_end } }; |
108 | sfnt_decode uint32_decode[] = { { d_uint32, 0 }, { d_end } }; |
109 | |
110 | /* Offset subdirectory -- the start of the file */ |
111 | typedef struct offsubdir_Tag offsubdir; |
112 | struct offsubdir_Tag { |
113 | unsigned scaler_type; |
114 | unsigned numTables; |
115 | }; |
116 | sfnt_decode offsubdir_decode[] = { |
117 | { d_uint32, offsetof(offsubdir, scaler_type) }, |
118 | { d_uint16, offsetof(offsubdir, numTables) }, |
119 | { d_skip(6) }, |
120 | { d_end } |
121 | }; |
122 | |
123 | #define sfnt_00010000 0x00010000 |
39d3d900 |
124 | #define TAG_OS_2 0x4f532f32 |
2729eafc |
125 | #define TAG_cmap 0x636d6170 |
126 | #define TAG_glyf 0x676c7966 |
127 | #define TAG_head 0x68656164 |
128 | #define TAG_hhea 0x68686561 |
129 | #define TAG_hmtx 0x686d7478 |
130 | #define TAG_loca 0x6c6f6361 |
131 | #define TAG_name 0x6e616d65 |
132 | #define TAG_post 0x706f7374 |
133 | #define sfnt_true 0x74727565 |
134 | |
135 | /* Table directory */ |
136 | typedef struct tabledir_Tag tabledir; |
137 | struct tabledir_Tag { |
138 | unsigned tag; |
139 | unsigned checkSum; |
140 | unsigned offset; |
141 | unsigned length; |
142 | }; |
143 | sfnt_decode tabledir_decode[] = { |
144 | { d_uint32, offsetof(tabledir, tag) }, |
145 | { d_uint32, offsetof(tabledir, checkSum) }, |
146 | { d_uint32, offsetof(tabledir, offset) }, |
147 | { d_uint32, offsetof(tabledir, length) }, |
148 | { d_end } |
149 | }; |
150 | |
39d3d900 |
151 | /* OS/2 and Windows compatibility table */ |
152 | typedef struct t_OS_2_Tag t_OS_2; |
153 | struct t_OS_2_Tag { |
154 | unsigned version; |
155 | int sTypoAscender, sTypoDescender; |
156 | int sxHeight, sCapHeight; |
157 | }; |
158 | sfnt_decode t_OS_2_v0_decode[] = { |
159 | { d_uint16, offsetof(t_OS_2, version) }, |
160 | { d_skip(66) }, /* xAvgCharWidth, usWeightClass, usWidthClass, fsType, */ |
161 | /* ySubscriptXSize, ySubscriptYSize, ySubscriptXOffset, */ |
162 | /* ySubscriptYOffset, ySuperscriptXSize, ySuperscriptYSize, */ |
163 | /* ySuperscriptXOffset, ySupercriptYOffset, sFamilyClass, panose, */ |
164 | /* ulUnicodeRange1, ulUnicodeRange2, ulUnicodeRange3, ulUnicodeRange4, */ |
165 | /* achVendID, fsSelection, usFirstCharIndex, usLastCharIndex */ |
166 | { d_end } |
167 | }; |
168 | sfnt_decode t_OS_2_v1_decode[] = { |
169 | { d_uint16, offsetof(t_OS_2, version) }, |
170 | { d_skip(66) }, /* xAvgCharWidth, usWeightClass, usWidthClass, fsType, */ |
171 | /* ySubscriptXSize, ySubscriptYSize, ySubscriptXOffset, */ |
172 | /* ySubscriptYOffset, ySuperscriptXSize, ySuperscriptYSize, */ |
173 | /* ySuperscriptXOffset, ySupercriptYOffset, sFamilyClass, panose, */ |
174 | /* ulUnicodeRange1, ulUnicodeRange2, ulUnicodeRange3, ulUnicodeRange4, */ |
175 | /* achVendID, fsSelection, usFirstCharIndex, usLastCharIndex */ |
176 | { d_int16, offsetof(t_OS_2, sTypoAscender) }, |
177 | { d_int16, offsetof(t_OS_2, sTypoDescender) }, |
178 | { d_skip(14) }, /* sTypoLineGap, usWinAscent, usWinDescent, */ |
179 | /* ulCodePageRange1, ulCodePageRange2 */ |
180 | { d_end } |
181 | }; |
182 | sfnt_decode t_OS_2_v2_decode[] = { |
183 | { d_uint16, offsetof(t_OS_2, version) }, |
184 | { d_skip(66) }, /* xAvgCharWidth, usWeightClass, usWidthClass, fsType, */ |
185 | /* ySubscriptXSize, ySubscriptYSize, ySubscriptXOffset, */ |
186 | /* ySubscriptYOffset, ySuperscriptXSize, ySuperscriptYSize, */ |
187 | /* ySuperscriptXOffset, ySupercriptYOffset, sFamilyClass, panose, */ |
188 | /* ulUnicodeRange1, ulUnicodeRange2, ulUnicodeRange3, ulUnicodeRange4, */ |
189 | /* achVendID, fsSelection, usFirstCharIndex, usLastCharIndex */ |
190 | { d_int16, offsetof(t_OS_2, sTypoAscender) }, |
191 | { d_int16, offsetof(t_OS_2, sTypoDescender) }, |
192 | { d_skip(14) }, /* sTypoLineGap, usWinAscent, usWinDescent, */ |
193 | /* ulCodePageRange1, ulCodePageRange2 */ |
194 | { d_int16, offsetof(t_OS_2, sxHeight) }, |
195 | { d_int16, offsetof(t_OS_2, sCapHeight) }, |
196 | { d_skip(6) }, /* usDefaultChar, usBreakChar, usMaxContext */ |
197 | { d_end } |
198 | }; |
199 | |
2729eafc |
200 | /* Character to Glyph ('cmap') table */ |
201 | typedef struct t_cmap_Tag t_cmap; |
202 | struct t_cmap_Tag { |
203 | unsigned numTables; |
204 | }; |
205 | sfnt_decode t_cmap_decode[] = { |
206 | { d_skip(2) }, |
207 | { d_uint16, offsetof(t_cmap, numTables) }, |
208 | { d_end } |
209 | }; |
210 | typedef struct encodingrec_Tag encodingrec; |
211 | struct encodingrec_Tag { |
212 | unsigned platformID; |
213 | unsigned encodingID; |
214 | unsigned offset; |
215 | }; |
216 | sfnt_decode encodingrec_decode[] = { |
217 | { d_uint16, offsetof(encodingrec, platformID) }, |
218 | { d_uint16, offsetof(encodingrec, encodingID) }, |
219 | { d_uint32, offsetof(encodingrec, offset) }, |
220 | { d_end } |
221 | }; |
222 | typedef struct cmap4_Tag cmap4; |
223 | struct cmap4_Tag { |
224 | unsigned length; |
225 | unsigned segCountX2; |
226 | }; |
227 | sfnt_decode cmap4_decode[] = { |
228 | { d_skip(2) }, /* format */ |
229 | { d_uint16, offsetof(cmap4, length) }, |
230 | { d_skip(2) }, /* language */ |
231 | { d_uint16, offsetof(cmap4, segCountX2) }, |
232 | { d_skip(6) }, /* searchRange, entrySelector, rangeShift */ |
233 | { d_end } |
234 | }; |
235 | |
236 | /* Font Header ('head') table */ |
237 | typedef struct t_head_Tag t_head; |
238 | struct t_head_Tag { |
239 | unsigned version; |
240 | unsigned fontRevision; |
241 | unsigned flags; |
242 | unsigned unitsPerEm; |
243 | int xMin, yMin, xMax, yMax; |
244 | int indexToLocFormat; |
245 | }; |
246 | sfnt_decode t_head_decode[] = { |
247 | { d_uint32, offsetof(t_head, version) }, |
248 | { d_uint32, offsetof(t_head, fontRevision) }, |
249 | { d_skip(8) }, /* checkSumAdjustment, magicNumber, flags */ |
250 | { d_uint16, offsetof(t_head, flags) }, |
251 | { d_uint16, offsetof(t_head, unitsPerEm) }, |
252 | { d_skip(16) }, /* created, modified */ |
253 | { d_int16, offsetof(t_head, xMin) }, |
254 | { d_int16, offsetof(t_head, yMin) }, |
255 | { d_int16, offsetof(t_head, xMax) }, |
256 | { d_int16, offsetof(t_head, yMax) }, |
257 | { d_skip(6) }, /* macStyle, lowestRecPPEM, fontDirectionHint */ |
258 | { d_int16, offsetof(t_head, indexToLocFormat) }, |
259 | { d_skip(2) }, |
260 | { d_end } |
261 | }; |
262 | |
263 | /* Horizontal Header ('hhea') table */ |
264 | typedef struct t_hhea_Tag t_hhea; |
265 | struct t_hhea_Tag { |
266 | unsigned version; |
267 | int ascent; |
268 | int descent; |
269 | int lineGap; |
270 | int metricDataFormat; |
271 | unsigned numOfLongHorMetrics; |
272 | }; |
273 | sfnt_decode t_hhea_decode[] = { |
274 | { d_uint32, offsetof(t_hhea, version) }, |
275 | { d_int16, offsetof(t_hhea, ascent) }, |
276 | { d_int16, offsetof(t_hhea, descent) }, |
277 | { d_int16, offsetof(t_hhea, lineGap) }, |
278 | { d_skip(22) }, |
279 | { d_int16, offsetof(t_hhea, metricDataFormat) }, |
280 | { d_uint16, offsetof(t_hhea, numOfLongHorMetrics) }, |
281 | { d_end } |
282 | }; |
283 | |
284 | /* Horizontal Metrics ('hmtx') table */ |
285 | sfnt_decode longhormetric_decode[] = { |
286 | { d_uint16, 0 }, |
287 | { d_skip(2) }, |
288 | { d_end } |
289 | }; |
290 | |
291 | /* Naming ('name') table */ |
292 | typedef struct t_name_Tag t_name; |
293 | typedef struct namerecord_Tag namerecord; |
294 | struct t_name_Tag { |
295 | unsigned format; |
296 | unsigned count; |
297 | unsigned stringOffset; |
298 | namerecord *nameRecord; |
299 | }; |
300 | sfnt_decode t_name_decode[] = { |
301 | { d_uint16, offsetof(t_name, format) }, |
302 | { d_uint16, offsetof(t_name, count) }, |
303 | { d_uint16, offsetof(t_name, stringOffset) }, |
304 | { d_end } |
305 | }; |
306 | struct namerecord_Tag { |
307 | unsigned platformID; |
308 | unsigned encodingID; |
309 | unsigned languageID; |
310 | unsigned nameID; |
311 | unsigned length; |
312 | unsigned offset; |
313 | }; |
314 | sfnt_decode namerecord_decode[] = { |
315 | { d_uint16, offsetof(namerecord, platformID) }, |
316 | { d_uint16, offsetof(namerecord, encodingID) }, |
317 | { d_uint16, offsetof(namerecord, languageID) }, |
318 | { d_uint16, offsetof(namerecord, nameID) }, |
319 | { d_uint16, offsetof(namerecord, length) }, |
320 | { d_uint16, offsetof(namerecord, offset) }, |
321 | { d_end } |
322 | }; |
323 | |
324 | /* PostScript compatibility ('post') table */ |
325 | typedef struct t_post_Tag t_post; |
326 | struct t_post_Tag { |
327 | unsigned format; |
47d88706 |
328 | int italicAngle; |
2729eafc |
329 | int underlinePosition; |
330 | int underlineThickness; |
331 | unsigned isFixedPitch; |
332 | unsigned minMemType42; |
333 | unsigned maxMemType42; |
334 | }; |
335 | sfnt_decode t_post_decode[] = { |
336 | { d_uint32, offsetof(t_post, format) }, |
47d88706 |
337 | { d_int32, offsetof(t_post, italicAngle) }, |
2729eafc |
338 | { d_int16, offsetof(t_post, underlinePosition) }, |
339 | { d_int16, offsetof(t_post, underlineThickness) }, |
340 | { d_uint32, offsetof(t_post, isFixedPitch) }, |
341 | { d_uint32, offsetof(t_post, minMemType42) }, |
342 | { d_uint32, offsetof(t_post, maxMemType42) }, |
343 | { d_skip(8) }, /* minMemType1, maxMemType1 */ |
344 | { d_end } |
345 | }; |
346 | |
347 | typedef struct { |
348 | glyph name; |
349 | unsigned short index; |
350 | } glyphmap; |
351 | |
352 | typedef struct sfnt_Tag sfnt; |
353 | struct sfnt_Tag { |
354 | void *data; |
355 | size_t len; |
356 | void *end; |
357 | offsubdir osd; |
358 | tabledir *td; |
359 | t_head head; |
360 | unsigned nglyphs; |
361 | glyph *glyphsbyindex; |
362 | unsigned short *glyphsbyname; |
363 | unsigned minmem, maxmem; |
364 | }; |
365 | |
366 | static int sfnt_findtable(sfnt *sf, unsigned tag, |
367 | void **startp, void **endp) { |
368 | size_t i; |
369 | |
370 | for (i = 0; i < sf->osd.numTables; i++) { |
371 | if (sf->td[i].tag == tag) { |
372 | *startp = (char *)sf->data + sf->td[i].offset; |
373 | *endp = (char *)*startp + sf->td[i].length; |
374 | return TRUE; |
375 | } |
376 | } |
377 | return FALSE; |
378 | } |
379 | |
380 | static char *sfnt_psname(font_info *fi) { |
381 | sfnt *sf = fi->fontfile; |
382 | t_name name; |
383 | void *ptr, *end; |
384 | size_t i; |
385 | char *psname; |
386 | namerecord *nr; |
387 | |
388 | if (!sfnt_findtable(sf, TAG_name, &ptr, &end)) |
389 | abort(); |
390 | ptr = decode(t_name_decode, ptr, end, &name); |
391 | name.nameRecord = snewn(name.count, namerecord); |
392 | ptr = decoden(namerecord_decode, ptr, sf->end, name.nameRecord, |
393 | sizeof(*name.nameRecord), name.count); |
394 | for (i = 0; i < name.count; i++) { |
395 | nr = name.nameRecord + i; |
396 | if (nr->nameID == 6) { |
397 | /* PostScript name, but can we make sense of it? */ |
398 | if (nr->platformID == 1 && nr->encodingID == 0) { |
399 | /* Mac Roman, which is ASCII for our purposes */ |
400 | psname = snewn(nr->length + 1, char); |
401 | memcpy(psname, (char *)ptr + nr->offset, nr->length); |
402 | psname[nr->length] = 0; |
403 | sfree(name.nameRecord); |
404 | return psname; |
405 | } |
406 | } |
407 | } |
408 | return NULL; |
409 | } |
410 | |
47d88706 |
411 | static unsigned short *cmp_glyphsbyindex; |
412 | static int glyphsbyname_cmp(void const *a, void const *b) { |
413 | glyph ga = cmp_glyphsbyindex[*(unsigned short *)a]; |
414 | glyph gb = cmp_glyphsbyindex[*(unsigned short *)b]; |
415 | if (ga < gb) return -1; |
416 | if (ga > gb) return 1; |
417 | return 0; |
418 | } |
419 | static int glyphsbyname_cmp_search(void const *a, void const *b) { |
420 | glyph ga = *(glyph *)a; |
421 | glyph gb = cmp_glyphsbyindex[*(unsigned short *)b]; |
422 | if (ga < gb) return -1; |
423 | if (ga > gb) return 1; |
424 | return 0; |
425 | } |
426 | |
2729eafc |
427 | /* |
428 | * Extract data from the 'post' table (mostly glyph mappings) |
429 | * |
430 | * TODO: cope better with duplicated glyph names (usually .notdef) |
431 | * TODO: when presented with format 3.0, try to use 'CFF' if present. |
432 | */ |
47d88706 |
433 | static void sfnt_mapglyphs(font_info *fi) { |
434 | sfnt *sf = fi->fontfile; |
2729eafc |
435 | t_post post; |
436 | void *ptr, *end; |
18e7663a |
437 | unsigned char *sptr; |
438 | char tmp[256]; |
2729eafc |
439 | glyph *extraglyphs; |
440 | unsigned nextras, i, g; |
441 | |
442 | sf->glyphsbyname = sf->glyphsbyindex = NULL; |
443 | if (!sfnt_findtable(sf, TAG_post, &ptr, &end)) |
444 | abort(); |
445 | ptr = decode(t_post_decode, ptr, end, &post); |
47d88706 |
446 | |
2729eafc |
447 | sf->minmem = post.minMemType42; |
448 | sf->maxmem = post.maxMemType42; |
47d88706 |
449 | fi->italicangle = post.italicAngle / 65536.0; |
2729eafc |
450 | if (ptr == NULL) abort(); |
451 | switch (post.format) { |
452 | case 0x00010000: |
453 | sf->nglyphs = 258; |
454 | sf->glyphsbyindex = (glyph *)tt_std_glyphs; |
455 | break; |
456 | case 0x00020000: |
18e7663a |
457 | if ((char *)ptr + 2 > (char *)end) return; |
2729eafc |
458 | decode_uint16(ptr, &sf->nglyphs); |
459 | ptr = (char *)ptr + 2; |
18e7663a |
460 | if ((char *)ptr + 2*sf->nglyphs > (char *)end) return; |
2729eafc |
461 | nextras = 0; |
18e7663a |
462 | for (sptr = (unsigned char *)ptr + 2*sf->nglyphs; |
463 | sptr < (unsigned char *)end; |
464 | sptr += *sptr+1) |
2729eafc |
465 | nextras++; |
466 | extraglyphs = snewn(nextras, glyph); |
467 | i = 0; |
18e7663a |
468 | for (sptr = (unsigned char *)ptr + 2*sf->nglyphs; |
469 | sptr < (unsigned char *)end; |
470 | sptr += *sptr+1) { |
2729eafc |
471 | memcpy(tmp, sptr + 1, *sptr); |
472 | tmp[*sptr] = 0; |
473 | assert(i < nextras); |
474 | extraglyphs[i++] = glyph_intern(tmp); |
475 | } |
476 | sf->glyphsbyindex = snewn(sf->nglyphs, glyph); |
477 | for (i = 0; i < sf->nglyphs; i++) { |
478 | decode_uint16((char *)ptr + 2*i, &g); |
479 | if (g <= 257) |
480 | sf->glyphsbyindex[i] = tt_std_glyphs[g]; |
481 | else if (g < 258 + nextras) |
482 | sf->glyphsbyindex[i] = extraglyphs[g - 258]; |
483 | else |
484 | sf->glyphsbyindex[i] = NOGLYPH; |
485 | } |
486 | sfree(extraglyphs); |
487 | break; |
488 | default: |
489 | abort(); |
490 | } |
47d88706 |
491 | /* Construct glyphsbyname */ |
492 | sf->glyphsbyname = snewn(sf->nglyphs, unsigned short); |
493 | for (i = 0; i < sf->nglyphs; i++) |
494 | sf->glyphsbyname[i] = i; |
495 | cmp_glyphsbyindex = sf->glyphsbyindex; |
496 | qsort(sf->glyphsbyname, sf->nglyphs, sizeof(*sf->glyphsbyname), |
497 | glyphsbyname_cmp); |
498 | } |
499 | |
500 | static glyph sfnt_indextoglyph(sfnt *sf, unsigned short idx) { |
501 | return sf->glyphsbyindex[idx]; |
502 | } |
503 | |
504 | static unsigned short sfnt_glyphtoindex(sfnt *sf, glyph g) { |
505 | cmp_glyphsbyindex = sf->glyphsbyindex; |
506 | return *(unsigned short *)bsearch(&g, sf->glyphsbyname, sf->nglyphs, |
507 | sizeof(*sf->glyphsbyname), |
508 | glyphsbyname_cmp_search); |
2729eafc |
509 | } |
510 | |
511 | /* |
39d3d900 |
512 | * Get data from 'hhea', 'hmtx', and 'OS/2' tables |
2729eafc |
513 | */ |
514 | void sfnt_getmetrics(font_info *fi) { |
515 | sfnt *sf = fi->fontfile; |
516 | t_hhea hhea; |
39d3d900 |
517 | t_OS_2 OS_2; |
2729eafc |
518 | void *ptr, *end; |
519 | unsigned i, j; |
520 | unsigned *hmtx; |
521 | |
39d3d900 |
522 | /* First, the bounding box from the 'head' table. */ |
523 | fi->fontbbox[0] = sf->head.xMin * FUNITS_PER_PT / sf->head.unitsPerEm; |
524 | fi->fontbbox[1] = sf->head.yMin * FUNITS_PER_PT / sf->head.unitsPerEm; |
525 | fi->fontbbox[2] = sf->head.xMax * FUNITS_PER_PT / sf->head.unitsPerEm; |
526 | fi->fontbbox[3] = sf->head.yMax * FUNITS_PER_PT / sf->head.unitsPerEm; |
2729eafc |
527 | if (!sfnt_findtable(sf, TAG_hhea, &ptr, &end)) |
528 | abort(); |
529 | if (decode(t_hhea_decode, ptr, end, &hhea) == NULL) |
530 | abort(); |
531 | if ((hhea.version & 0xffff0000) != 0x00010000) |
532 | abort(); |
533 | fi->ascent = hhea.ascent; |
534 | fi->descent = hhea.descent; |
535 | if (hhea.metricDataFormat != 0) |
536 | abort(); |
537 | if (!sfnt_findtable(sf, TAG_hmtx, &ptr, &end)) |
538 | abort(); |
539 | hmtx = snewn(hhea.numOfLongHorMetrics, unsigned); |
540 | if (decoden(longhormetric_decode, ptr, end, hmtx, sizeof(*hmtx), |
541 | hhea.numOfLongHorMetrics) == NULL) |
542 | abort(); |
543 | for (i = 0; i < sf->nglyphs; i++) { |
544 | glyph_width *w = snew(glyph_width); |
47d88706 |
545 | w->glyph = sfnt_indextoglyph(sf, i); |
2729eafc |
546 | j = i < hhea.numOfLongHorMetrics ? i : hhea.numOfLongHorMetrics - 1; |
547 | w->width = hmtx[j] * UNITS_PER_PT / sf->head.unitsPerEm; |
548 | add234(fi->widths, w); |
549 | } |
39d3d900 |
550 | /* Now see if the 'OS/2' table has any useful metrics */ |
551 | if (!sfnt_findtable(sf, TAG_OS_2, &ptr, &end)) |
552 | return; |
553 | if (decode(uint16_decode, ptr, end, &OS_2.version) == NULL) |
554 | return; |
555 | if (OS_2.version >= 2) { |
556 | if (decode(t_OS_2_v2_decode, ptr, end, &OS_2) == NULL) |
557 | return; |
558 | fi->xheight = OS_2.sxHeight * FUNITS_PER_PT / sf->head.unitsPerEm; |
559 | fi->capheight = OS_2.sCapHeight * FUNITS_PER_PT / sf->head.unitsPerEm; |
560 | } else if (OS_2.version == 1) { |
561 | if (decode(t_OS_2_v1_decode, ptr, end, &OS_2) == NULL) |
562 | return; |
563 | } else |
564 | return; |
565 | fi->ascent = OS_2.sTypoAscender * FUNITS_PER_PT / sf->head.unitsPerEm; |
566 | fi->descent = OS_2.sTypoDescender * FUNITS_PER_PT / sf->head.unitsPerEm; |
2729eafc |
567 | } |
568 | |
569 | /* |
570 | * Get mapping data from 'cmap' table |
571 | * |
d274495f |
572 | * We look for either a (0, 3), or (3, 1) table, both of these being |
573 | * versions of UCS-2. We only handle format 4 of this table, since |
574 | * that seems to be the only one in use. |
2729eafc |
575 | */ |
576 | void sfnt_getmap(font_info *fi) { |
577 | sfnt *sf = fi->fontfile; |
578 | t_cmap cmap; |
579 | encodingrec *esd; |
580 | void *base, *ptr, *end; |
581 | unsigned i; |
582 | unsigned format; |
583 | |
584 | |
585 | for (i = 0; i < lenof(fi->bmp); i++) |
586 | fi->bmp[i] = 0xFFFF; |
587 | if (!sfnt_findtable(sf, TAG_cmap, &ptr, &end)) |
588 | abort(); |
589 | base = ptr; |
590 | ptr = decode(t_cmap_decode, ptr, end, &cmap); |
591 | if (ptr == NULL) abort(); |
592 | esd = snewn(cmap.numTables, encodingrec); |
593 | ptr = decoden(encodingrec_decode, ptr, end, esd, sizeof(*esd), |
594 | cmap.numTables); |
595 | if (ptr == NULL) abort(); |
596 | for (i = 0; i < cmap.numTables; i++) { |
597 | if (!decode(uint16_decode, (char *)base + esd[i].offset, end, &format)) |
598 | abort(); |
599 | if ((esd[i].platformID == 0 && esd[i].encodingID == 3) || |
600 | (esd[i].platformID == 3 && esd[i].encodingID == 1)) { |
601 | /* UCS-2 encoding */ |
602 | if (!decode(uint16_decode, (char *)base + esd[i].offset, end, |
603 | &format)) |
604 | abort(); |
605 | if (format == 4) { |
606 | unsigned *data, *endCode, *startCode, *idDelta, *idRangeOffset; |
607 | unsigned *glyphIndexArray; |
608 | unsigned segcount, nword, nglyphindex, j; |
609 | cmap4 cmap4; |
610 | |
611 | ptr = decode(cmap4_decode, (char *)base + esd[i].offset, end, |
612 | &cmap4); |
613 | if (!ptr) abort(); |
614 | segcount = cmap4.segCountX2 / 2; |
615 | nword = cmap4.length / 2 - 7; |
616 | data = snewn(nword, unsigned); |
617 | if (!decoden(uint16_decode, ptr, (char *)ptr + nword * 2, |
618 | data, sizeof(*data), nword)) abort(); |
619 | endCode = data; |
620 | startCode = data + segcount + 1; |
621 | idDelta = startCode + segcount; |
622 | idRangeOffset = idDelta + segcount; |
623 | glyphIndexArray = idRangeOffset + segcount; |
624 | nglyphindex = nword - segcount * 4 - 1; |
625 | |
626 | for (j = 0; j < segcount; j++) { |
627 | unsigned k, idx; |
628 | |
629 | if (idRangeOffset[j] == 0) { |
630 | for (k = startCode[j]; k <= endCode[j]; k++) { |
631 | idx = (k + idDelta[j]) & 0xffff; |
632 | if (idx != 0) { |
633 | if (idx > sf->nglyphs) abort(); |
47d88706 |
634 | fi->bmp[k] = sfnt_indextoglyph(sf, idx); |
2729eafc |
635 | } |
636 | } |
637 | } else { |
638 | unsigned startidx = idRangeOffset[j]/2 - segcount + j; |
639 | for (k = startCode[j]; k <= endCode[j]; k++) { |
640 | idx = glyphIndexArray[startidx + k - startCode[j]]; |
641 | if (idx != 0) { |
642 | idx = (idx + idDelta[j]) & 0xffff; |
643 | if (idx > sf->nglyphs) abort(); |
47d88706 |
644 | fi->bmp[k] = sfnt_indextoglyph(sf, idx); |
2729eafc |
645 | } |
646 | } |
647 | } |
648 | } |
649 | |
650 | sfree(data); |
651 | } |
652 | } |
653 | } |
654 | } |
655 | |
656 | void read_sfnt_file(input *in) { |
657 | sfnt *sf = snew(sfnt); |
658 | size_t off = 0, got; |
659 | FILE *fp = in->currfp; |
660 | font_info *fi = snew(font_info); |
18e7663a |
661 | /* size_t i; */ |
2729eafc |
662 | void *ptr, *end; |
663 | |
664 | fi->name = NULL; |
665 | fi->widths = newtree234(width_cmp); |
666 | fi->kerns = newtree234(kern_cmp); |
667 | fi->ligs = newtree234(lig_cmp); |
668 | fi->fontbbox[0] = fi->fontbbox[1] = fi->fontbbox[2] = fi->fontbbox[3] = 0; |
669 | fi->capheight = fi->xheight = fi->ascent = fi->descent = 0; |
670 | fi->stemh = fi->stemv = fi->italicangle = 0; |
671 | fi->fontfile = sf; |
672 | fi->filetype = TRUETYPE; |
673 | |
674 | sf->len = 32768; |
675 | sf->data = snewn(sf->len, unsigned char); |
676 | for (;;) { |
677 | got = fread((char *)sf->data + off, 1, sf->len - off, fp); |
678 | off += got; |
679 | if (off != sf->len) break; |
680 | sf->len *= 2; |
681 | sf->data = sresize(sf->data, sf->len, unsigned char); |
682 | } |
683 | sf->len = off; |
684 | sf->data = sresize(sf->data, sf->len, unsigned char); |
685 | sf->end = (char *)sf->data + sf->len; |
686 | decode(offsubdir_decode, sf->data, sf->end, &sf->osd); |
687 | /* |
688 | fprintf(stderr, "scaler type = 0x%x; numTables = %u\n", |
689 | sf->osd.scaler_type, sf->osd.numTables); |
690 | */ |
691 | sf->td = snewn(sf->osd.numTables, tabledir); |
692 | decoden(tabledir_decode, (char *)sf->data + 12, sf->end, |
693 | sf->td, sizeof(*sf->td), sf->osd.numTables); |
694 | /* |
695 | for (i = 0; i < sf->osd.numTables; i++) |
696 | fprintf(stderr, "table tag = '%c%c%c%c'; offset = %#10x; length = %#10x\n", |
697 | sf->td[i].tag >> 24, sf->td[i].tag >> 16, sf->td[i].tag >> 8, sf->td[i].tag, sf->td[i].offset, sf->td[i].length); |
698 | */ |
699 | if (!sfnt_findtable(sf, TAG_head, &ptr, &end)) |
700 | abort(); |
701 | if (decode(t_head_decode, ptr, end, &sf->head) == NULL) |
702 | abort(); |
703 | if ((sf->head.version & 0xffff0000) != 0x00010000) |
704 | abort(); |
705 | fi->name = sfnt_psname(fi); |
47d88706 |
706 | sfnt_mapglyphs(fi); |
2729eafc |
707 | sfnt_getmetrics(fi); |
708 | sfnt_getmap(fi); |
709 | fi->next = all_fonts; |
710 | all_fonts = fi; |
711 | fclose(in->currfp); |
712 | } |
713 | |
714 | static int sizecmp(const void *a, const void *b) { |
715 | if (*(size_t *)a < *(size_t *)b) return -1; |
716 | if (*(size_t *)a > *(size_t *)b) return 1; |
717 | return 0; |
718 | } |
719 | |
720 | /* |
721 | * The format for embedding TrueType fonts in Postscript is defined in |
722 | * Adobe Technical Note #5012: The Type 42 Font Format Specification. |
723 | * <http://partners.adobe.com/public/developer/en/font/5012.Type42_Spec.pdf> |
724 | */ |
725 | |
726 | void sfnt_writeps(font_info const *fi, FILE *ofp) { |
727 | unsigned i, j, lastbreak; |
728 | sfnt *sf = fi->fontfile; |
729 | size_t *breaks, glyfoff, glyflen; |
730 | void *glyfptr, *glyfend, *locaptr, *locaend; |
731 | unsigned *loca; |
c358bf5b |
732 | int cc = 0; |
2729eafc |
733 | |
734 | /* XXX Unclear that this is the correct format. */ |
735 | fprintf(ofp, "%%!PS-TrueTypeFont-%u-%u\n", sf->osd.scaler_type, |
736 | sf->head.fontRevision); |
737 | if (sf->minmem) |
738 | fprintf(ofp, "%%%%VMUsage: %u %u\n", sf->minmem, sf->maxmem); |
739 | fprintf(ofp, "9 dict dup begin\n"); |
740 | fprintf(ofp, "/FontType 42 def\n"); |
741 | fprintf(ofp, "/FontMatrix [1 0 0 1 0 0] def\n"); |
742 | fprintf(ofp, "/FontName /%s def\n", fi->name); |
743 | fprintf(ofp, "/Encoding StandardEncoding def\n"); |
744 | if ((sf->head.flags & 0x0003) == 0x0003) { |
745 | /* |
746 | * Sensible font with the origin in the right place, such that |
747 | * the bounding box is meaningful. |
748 | */ |
749 | fprintf(ofp, "/FontBBox [%g %g %g %g] readonly def\n", |
750 | (double)sf->head.xMin / sf->head.unitsPerEm, |
751 | (double)sf->head.yMin / sf->head.unitsPerEm, |
752 | (double)sf->head.xMax / sf->head.unitsPerEm, |
753 | (double)sf->head.yMax / sf->head.unitsPerEm); |
754 | } else { |
755 | /* Non-sensible font. */ |
b554f0ec |
756 | fprintf(ofp, "/FontBBox [0 0 0 0] readonly def\n"); |
2729eafc |
757 | } |
758 | fprintf(ofp, "/PaintType 0 def\n"); |
759 | fprintf(ofp, "/CharStrings %u dict dup begin\n", sf->nglyphs); |
a2bd2219 |
760 | fprintf(ofp, "0 1 %u{currentfile token pop exch def}bind for\n", |
761 | sf->nglyphs - 1); |
2729eafc |
762 | for (i = 0; i < sf->nglyphs; i++) |
c358bf5b |
763 | ps_token(ofp, &cc, "/%s", glyph_extern(sfnt_indextoglyph(sf, i))); |
764 | fprintf(ofp, "\nend readonly def\n"); |
2729eafc |
765 | fprintf(ofp, "/sfnts [<"); |
766 | breaks = snewn(sf->osd.numTables + sf->nglyphs, size_t); |
767 | for (i = 0; i < sf->osd.numTables; i++) { |
768 | breaks[i] = sf->td[i].offset; |
769 | } |
770 | if (!sfnt_findtable(sf, TAG_glyf, &glyfptr, &glyfend)) |
771 | abort(); |
772 | glyfoff = (char *)glyfptr - (char *)sf->data; |
773 | glyflen = (char *)glyfend - (char *)glyfptr; |
774 | if (!sfnt_findtable(sf, TAG_loca, &locaptr, &locaend)) |
775 | abort(); |
776 | loca = snewn(sf->nglyphs, unsigned); |
777 | if (sf->head.indexToLocFormat == 0) { |
778 | if (!decoden(uint16_decode, locaptr, locaend, loca, sizeof(*loca), |
779 | sf->nglyphs)) abort(); |
780 | for (i = 0; i < sf->nglyphs; i++) loca[i] *= 2; |
781 | } else { |
782 | if (!decoden(uint32_decode, locaptr, locaend, loca, sizeof(*loca), |
783 | sf->nglyphs)) abort(); |
784 | } |
785 | for (i = 1; i < sf->nglyphs; i++) { |
786 | if (loca[i] > glyflen) abort(); |
787 | breaks[sf->osd.numTables + i - 1] = loca[i] + glyfoff; |
788 | } |
789 | breaks[sf->osd.numTables + sf->nglyphs - 1] = sf->len; |
790 | qsort(breaks, sf->osd.numTables + sf->nglyphs, sizeof(*breaks), sizecmp); |
791 | j = lastbreak = 0; |
792 | for (i = 0; i < sf->len; i++) { |
793 | if ((i - lastbreak) % 38 == 0) fprintf(ofp, "\n"); |
794 | if (i == breaks[j]) { |
795 | while (i == breaks[j]) j++; |
796 | lastbreak = i; |
797 | fprintf(ofp, "00><\n"); |
798 | } |
799 | fprintf(ofp, "%02x", *((unsigned char *)sf->data + i)); |
800 | } |
801 | fprintf(ofp, "00>] readonly def\n"); |
802 | sfree(breaks); |
803 | fprintf(ofp, "end /%s exch definefont\n", fi->name); |
804 | } |
dde3b989 |
805 | |
806 | void sfnt_cmap(font_encoding *fe, object *cmap) { |
807 | unsigned i; |
808 | |
809 | objtext(cmap, "<</Type/CMap\n/CMapName/"); |
810 | objtext(cmap, fe->name); |
811 | objtext(cmap, "\n/CIDSystemInfo<</Registry(Adobe)/Ordering(Identity)" |
812 | "/Supplement 0>>\n"); |
813 | objstream(cmap, "%!PS-Adobe-3.0 Resource-CMap\n" |
814 | "%%DocumentNeededResources: procset CIDInit\n" |
815 | "%%IncludeResource: procset CIDInit\n" |
816 | "%%BeginResource: CMap "); |
817 | objstream(cmap, fe->name); |
818 | objstream(cmap, "\n%%Title ("); |
819 | objstream(cmap, fe->name); |
820 | objstream(cmap, " Adobe Identity 0)\n%%Version: 1\n%%EndComments\n"); |
821 | objstream(cmap, "/CIDInit/ProcSet findresource begin\n"); |
822 | objstream(cmap, "12 dict begin begincmap\n"); |
823 | objstream(cmap, "/CIDSystemInfo 3 dict dup begin\n" |
824 | "/Registry(Adobe)def/Ordering(Identity)def/Supplement 0 def " |
825 | "end def\n"); |
826 | objstream(cmap, "/CMapName/"); |
827 | objstream(cmap, fe->name); |
828 | objstream(cmap, " def/CMapType 0 def/WMode 0 def\n"); |
829 | objstream(cmap, "1 begincodespacerange<00><FF>endcodespacerange\n"); |
830 | for (i = 0; i < 256; i++) { |
831 | char buf[20]; |
832 | if (fe->vector[i] == NOGLYPH) |
833 | continue; |
834 | objstream(cmap, "1 begincidchar"); |
835 | sprintf(buf, "<%02X>", i); |
836 | objstream(cmap, buf); |
837 | sprintf(buf, "%hu", sfnt_glyphtoindex(fe->font->info->fontfile, |
838 | fe->vector[i])); |
839 | objstream(cmap, buf); |
840 | objstream(cmap, " endcidchar\n"); |
841 | } |
842 | objstream(cmap, "endcmap CMapName currentdict /CMap defineresource pop " |
843 | "end end\n%%EndResource\n%%EOF\n"); |
844 | } |
845 | |
846 | void sfnt_data(font_info *fi, char **bufp, size_t *lenp) { |
847 | sfnt *sf = fi->fontfile; |
848 | *bufp = sf->data; |
849 | *lenp = sf->len; |
850 | } |