| 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 | |
| 31 | #if 0 /* unused */ |
| 32 | static void decode_uint8(void *src, void *dest) { |
| 33 | *(unsigned int *)dest = *(unsigned char *)src; |
| 34 | } |
| 35 | #define d_uint8 decode_uint8, 1 |
| 36 | #endif |
| 37 | |
| 38 | #if 0 /* unused */ |
| 39 | static void decode_int8(void *src, void *dest) { |
| 40 | *(int *)dest = *(signed char *)src; |
| 41 | } |
| 42 | #define d_int8 decode_int8, 1 |
| 43 | #endif |
| 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 | #if 0 /* unused */ |
| 66 | static void decode_int32(void *src, void *dest) { |
| 67 | signed char *cp = src; |
| 68 | unsigned char *ucp = src; |
| 69 | *(int *)dest = (cp[0] << 24) + (ucp[1] << 16) + (ucp[2] << 8) + ucp[3]; |
| 70 | } |
| 71 | #define d_int32 decode_int32, 4 |
| 72 | #endif |
| 73 | |
| 74 | static void decode_skip(void *src, void *dest) { |
| 75 | IGNORE(src); |
| 76 | IGNORE(dest); |
| 77 | /* do nothing */ |
| 78 | } |
| 79 | #define d_skip(n) decode_skip, (n), 0 |
| 80 | |
| 81 | static void decode_end(void *src, void *dest) { |
| 82 | IGNORE(src); |
| 83 | IGNORE(dest); |
| 84 | /* never called */ |
| 85 | } |
| 86 | #define d_end decode_end, 0, 0 |
| 87 | |
| 88 | static void *decode(sfnt_decode *dec, void *src, void *end, void *dest) { |
| 89 | while (dec->decoder != decode_end) { |
| 90 | if ((char *)src + dec->src_len > (char *)end) return NULL; |
| 91 | dec->decoder(src, (char *)dest + dec->dest_offset); |
| 92 | src = (char *)src + dec->src_len; |
| 93 | dec++; |
| 94 | } |
| 95 | return src; |
| 96 | } |
| 97 | |
| 98 | static void *decoden(sfnt_decode *dec, void *src, void *end, void *dest, |
| 99 | size_t size, size_t n) { |
| 100 | while (n-- && src) { |
| 101 | src = decode(dec, src, end, dest); |
| 102 | dest = (char *)dest + size; |
| 103 | } |
| 104 | return src; |
| 105 | } |
| 106 | |
| 107 | /* Decoding specs for simple data types */ |
| 108 | sfnt_decode uint16_decode[] = { { d_uint16, 0 }, { d_end } }; |
| 109 | sfnt_decode int16_decode[] = { { d_int16, 0 }, { d_end } }; |
| 110 | sfnt_decode uint32_decode[] = { { d_uint32, 0 }, { d_end } }; |
| 111 | |
| 112 | /* Offset subdirectory -- the start of the file */ |
| 113 | typedef struct offsubdir_Tag offsubdir; |
| 114 | struct offsubdir_Tag { |
| 115 | unsigned scaler_type; |
| 116 | unsigned numTables; |
| 117 | }; |
| 118 | sfnt_decode offsubdir_decode[] = { |
| 119 | { d_uint32, offsetof(offsubdir, scaler_type) }, |
| 120 | { d_uint16, offsetof(offsubdir, numTables) }, |
| 121 | { d_skip(6) }, |
| 122 | { d_end } |
| 123 | }; |
| 124 | |
| 125 | #define sfnt_00010000 0x00010000 |
| 126 | #define TAG_cmap 0x636d6170 |
| 127 | #define TAG_glyf 0x676c7966 |
| 128 | #define TAG_head 0x68656164 |
| 129 | #define TAG_hhea 0x68686561 |
| 130 | #define TAG_hmtx 0x686d7478 |
| 131 | #define TAG_loca 0x6c6f6361 |
| 132 | #define TAG_name 0x6e616d65 |
| 133 | #define TAG_post 0x706f7374 |
| 134 | #define sfnt_true 0x74727565 |
| 135 | |
| 136 | /* Table directory */ |
| 137 | typedef struct tabledir_Tag tabledir; |
| 138 | struct tabledir_Tag { |
| 139 | unsigned tag; |
| 140 | unsigned checkSum; |
| 141 | unsigned offset; |
| 142 | unsigned length; |
| 143 | }; |
| 144 | sfnt_decode tabledir_decode[] = { |
| 145 | { d_uint32, offsetof(tabledir, tag) }, |
| 146 | { d_uint32, offsetof(tabledir, checkSum) }, |
| 147 | { d_uint32, offsetof(tabledir, offset) }, |
| 148 | { d_uint32, offsetof(tabledir, length) }, |
| 149 | { d_end } |
| 150 | }; |
| 151 | |
| 152 | /* Character to Glyph ('cmap') table */ |
| 153 | typedef struct t_cmap_Tag t_cmap; |
| 154 | struct t_cmap_Tag { |
| 155 | unsigned numTables; |
| 156 | }; |
| 157 | sfnt_decode t_cmap_decode[] = { |
| 158 | { d_skip(2) }, |
| 159 | { d_uint16, offsetof(t_cmap, numTables) }, |
| 160 | { d_end } |
| 161 | }; |
| 162 | typedef struct encodingrec_Tag encodingrec; |
| 163 | struct encodingrec_Tag { |
| 164 | unsigned platformID; |
| 165 | unsigned encodingID; |
| 166 | unsigned offset; |
| 167 | }; |
| 168 | sfnt_decode encodingrec_decode[] = { |
| 169 | { d_uint16, offsetof(encodingrec, platformID) }, |
| 170 | { d_uint16, offsetof(encodingrec, encodingID) }, |
| 171 | { d_uint32, offsetof(encodingrec, offset) }, |
| 172 | { d_end } |
| 173 | }; |
| 174 | typedef struct cmap4_Tag cmap4; |
| 175 | struct cmap4_Tag { |
| 176 | unsigned length; |
| 177 | unsigned segCountX2; |
| 178 | }; |
| 179 | sfnt_decode cmap4_decode[] = { |
| 180 | { d_skip(2) }, /* format */ |
| 181 | { d_uint16, offsetof(cmap4, length) }, |
| 182 | { d_skip(2) }, /* language */ |
| 183 | { d_uint16, offsetof(cmap4, segCountX2) }, |
| 184 | { d_skip(6) }, /* searchRange, entrySelector, rangeShift */ |
| 185 | { d_end } |
| 186 | }; |
| 187 | |
| 188 | /* Font Header ('head') table */ |
| 189 | typedef struct t_head_Tag t_head; |
| 190 | struct t_head_Tag { |
| 191 | unsigned version; |
| 192 | unsigned fontRevision; |
| 193 | unsigned flags; |
| 194 | unsigned unitsPerEm; |
| 195 | int xMin, yMin, xMax, yMax; |
| 196 | int indexToLocFormat; |
| 197 | }; |
| 198 | sfnt_decode t_head_decode[] = { |
| 199 | { d_uint32, offsetof(t_head, version) }, |
| 200 | { d_uint32, offsetof(t_head, fontRevision) }, |
| 201 | { d_skip(8) }, /* checkSumAdjustment, magicNumber, flags */ |
| 202 | { d_uint16, offsetof(t_head, flags) }, |
| 203 | { d_uint16, offsetof(t_head, unitsPerEm) }, |
| 204 | { d_skip(16) }, /* created, modified */ |
| 205 | { d_int16, offsetof(t_head, xMin) }, |
| 206 | { d_int16, offsetof(t_head, yMin) }, |
| 207 | { d_int16, offsetof(t_head, xMax) }, |
| 208 | { d_int16, offsetof(t_head, yMax) }, |
| 209 | { d_skip(6) }, /* macStyle, lowestRecPPEM, fontDirectionHint */ |
| 210 | { d_int16, offsetof(t_head, indexToLocFormat) }, |
| 211 | { d_skip(2) }, |
| 212 | { d_end } |
| 213 | }; |
| 214 | |
| 215 | /* Horizontal Header ('hhea') table */ |
| 216 | typedef struct t_hhea_Tag t_hhea; |
| 217 | struct t_hhea_Tag { |
| 218 | unsigned version; |
| 219 | int ascent; |
| 220 | int descent; |
| 221 | int lineGap; |
| 222 | int metricDataFormat; |
| 223 | unsigned numOfLongHorMetrics; |
| 224 | }; |
| 225 | sfnt_decode t_hhea_decode[] = { |
| 226 | { d_uint32, offsetof(t_hhea, version) }, |
| 227 | { d_int16, offsetof(t_hhea, ascent) }, |
| 228 | { d_int16, offsetof(t_hhea, descent) }, |
| 229 | { d_int16, offsetof(t_hhea, lineGap) }, |
| 230 | { d_skip(22) }, |
| 231 | { d_int16, offsetof(t_hhea, metricDataFormat) }, |
| 232 | { d_uint16, offsetof(t_hhea, numOfLongHorMetrics) }, |
| 233 | { d_end } |
| 234 | }; |
| 235 | |
| 236 | /* Horizontal Metrics ('hmtx') table */ |
| 237 | sfnt_decode longhormetric_decode[] = { |
| 238 | { d_uint16, 0 }, |
| 239 | { d_skip(2) }, |
| 240 | { d_end } |
| 241 | }; |
| 242 | |
| 243 | /* Naming ('name') table */ |
| 244 | typedef struct t_name_Tag t_name; |
| 245 | typedef struct namerecord_Tag namerecord; |
| 246 | struct t_name_Tag { |
| 247 | unsigned format; |
| 248 | unsigned count; |
| 249 | unsigned stringOffset; |
| 250 | namerecord *nameRecord; |
| 251 | }; |
| 252 | sfnt_decode t_name_decode[] = { |
| 253 | { d_uint16, offsetof(t_name, format) }, |
| 254 | { d_uint16, offsetof(t_name, count) }, |
| 255 | { d_uint16, offsetof(t_name, stringOffset) }, |
| 256 | { d_end } |
| 257 | }; |
| 258 | struct namerecord_Tag { |
| 259 | unsigned platformID; |
| 260 | unsigned encodingID; |
| 261 | unsigned languageID; |
| 262 | unsigned nameID; |
| 263 | unsigned length; |
| 264 | unsigned offset; |
| 265 | }; |
| 266 | sfnt_decode namerecord_decode[] = { |
| 267 | { d_uint16, offsetof(namerecord, platformID) }, |
| 268 | { d_uint16, offsetof(namerecord, encodingID) }, |
| 269 | { d_uint16, offsetof(namerecord, languageID) }, |
| 270 | { d_uint16, offsetof(namerecord, nameID) }, |
| 271 | { d_uint16, offsetof(namerecord, length) }, |
| 272 | { d_uint16, offsetof(namerecord, offset) }, |
| 273 | { d_end } |
| 274 | }; |
| 275 | |
| 276 | /* PostScript compatibility ('post') table */ |
| 277 | typedef struct t_post_Tag t_post; |
| 278 | struct t_post_Tag { |
| 279 | unsigned format; |
| 280 | unsigned italicAngle; |
| 281 | int underlinePosition; |
| 282 | int underlineThickness; |
| 283 | unsigned isFixedPitch; |
| 284 | unsigned minMemType42; |
| 285 | unsigned maxMemType42; |
| 286 | }; |
| 287 | sfnt_decode t_post_decode[] = { |
| 288 | { d_uint32, offsetof(t_post, format) }, |
| 289 | { d_uint32, offsetof(t_post, italicAngle) }, |
| 290 | { d_int16, offsetof(t_post, underlinePosition) }, |
| 291 | { d_int16, offsetof(t_post, underlineThickness) }, |
| 292 | { d_uint32, offsetof(t_post, isFixedPitch) }, |
| 293 | { d_uint32, offsetof(t_post, minMemType42) }, |
| 294 | { d_uint32, offsetof(t_post, maxMemType42) }, |
| 295 | { d_skip(8) }, /* minMemType1, maxMemType1 */ |
| 296 | { d_end } |
| 297 | }; |
| 298 | |
| 299 | typedef struct { |
| 300 | glyph name; |
| 301 | unsigned short index; |
| 302 | } glyphmap; |
| 303 | |
| 304 | typedef struct sfnt_Tag sfnt; |
| 305 | struct sfnt_Tag { |
| 306 | void *data; |
| 307 | size_t len; |
| 308 | void *end; |
| 309 | offsubdir osd; |
| 310 | tabledir *td; |
| 311 | t_head head; |
| 312 | unsigned nglyphs; |
| 313 | glyph *glyphsbyindex; |
| 314 | unsigned short *glyphsbyname; |
| 315 | unsigned minmem, maxmem; |
| 316 | }; |
| 317 | |
| 318 | static int sfnt_findtable(sfnt *sf, unsigned tag, |
| 319 | void **startp, void **endp) { |
| 320 | size_t i; |
| 321 | |
| 322 | for (i = 0; i < sf->osd.numTables; i++) { |
| 323 | if (sf->td[i].tag == tag) { |
| 324 | *startp = (char *)sf->data + sf->td[i].offset; |
| 325 | *endp = (char *)*startp + sf->td[i].length; |
| 326 | return TRUE; |
| 327 | } |
| 328 | } |
| 329 | return FALSE; |
| 330 | } |
| 331 | |
| 332 | static char *sfnt_psname(font_info *fi) { |
| 333 | sfnt *sf = fi->fontfile; |
| 334 | t_name name; |
| 335 | void *ptr, *end; |
| 336 | size_t i; |
| 337 | char *psname; |
| 338 | namerecord *nr; |
| 339 | |
| 340 | if (!sfnt_findtable(sf, TAG_name, &ptr, &end)) |
| 341 | abort(); |
| 342 | ptr = decode(t_name_decode, ptr, end, &name); |
| 343 | name.nameRecord = snewn(name.count, namerecord); |
| 344 | ptr = decoden(namerecord_decode, ptr, sf->end, name.nameRecord, |
| 345 | sizeof(*name.nameRecord), name.count); |
| 346 | for (i = 0; i < name.count; i++) { |
| 347 | nr = name.nameRecord + i; |
| 348 | if (nr->nameID == 6) { |
| 349 | /* PostScript name, but can we make sense of it? */ |
| 350 | if (nr->platformID == 1 && nr->encodingID == 0) { |
| 351 | /* Mac Roman, which is ASCII for our purposes */ |
| 352 | psname = snewn(nr->length + 1, char); |
| 353 | memcpy(psname, (char *)ptr + nr->offset, nr->length); |
| 354 | psname[nr->length] = 0; |
| 355 | sfree(name.nameRecord); |
| 356 | return psname; |
| 357 | } |
| 358 | } |
| 359 | } |
| 360 | return NULL; |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Extract data from the 'post' table (mostly glyph mappings) |
| 365 | * |
| 366 | * TODO: cope better with duplicated glyph names (usually .notdef) |
| 367 | * TODO: when presented with format 3.0, try to use 'CFF' if present. |
| 368 | */ |
| 369 | static void sfnt_mapglyphs(sfnt *sf) { |
| 370 | t_post post; |
| 371 | void *ptr, *end; |
| 372 | unsigned char *sptr; |
| 373 | char tmp[256]; |
| 374 | glyph *extraglyphs; |
| 375 | unsigned nextras, i, g; |
| 376 | |
| 377 | sf->glyphsbyname = sf->glyphsbyindex = NULL; |
| 378 | if (!sfnt_findtable(sf, TAG_post, &ptr, &end)) |
| 379 | abort(); |
| 380 | ptr = decode(t_post_decode, ptr, end, &post); |
| 381 | sf->minmem = post.minMemType42; |
| 382 | sf->maxmem = post.maxMemType42; |
| 383 | if (ptr == NULL) abort(); |
| 384 | switch (post.format) { |
| 385 | case 0x00010000: |
| 386 | sf->nglyphs = 258; |
| 387 | sf->glyphsbyindex = (glyph *)tt_std_glyphs; |
| 388 | break; |
| 389 | case 0x00020000: |
| 390 | if ((char *)ptr + 2 > (char *)end) return; |
| 391 | decode_uint16(ptr, &sf->nglyphs); |
| 392 | ptr = (char *)ptr + 2; |
| 393 | if ((char *)ptr + 2*sf->nglyphs > (char *)end) return; |
| 394 | nextras = 0; |
| 395 | for (sptr = (unsigned char *)ptr + 2*sf->nglyphs; |
| 396 | sptr < (unsigned char *)end; |
| 397 | sptr += *sptr+1) |
| 398 | nextras++; |
| 399 | extraglyphs = snewn(nextras, glyph); |
| 400 | i = 0; |
| 401 | for (sptr = (unsigned char *)ptr + 2*sf->nglyphs; |
| 402 | sptr < (unsigned char *)end; |
| 403 | sptr += *sptr+1) { |
| 404 | memcpy(tmp, sptr + 1, *sptr); |
| 405 | tmp[*sptr] = 0; |
| 406 | assert(i < nextras); |
| 407 | extraglyphs[i++] = glyph_intern(tmp); |
| 408 | } |
| 409 | sf->glyphsbyindex = snewn(sf->nglyphs, glyph); |
| 410 | for (i = 0; i < sf->nglyphs; i++) { |
| 411 | decode_uint16((char *)ptr + 2*i, &g); |
| 412 | if (g <= 257) |
| 413 | sf->glyphsbyindex[i] = tt_std_glyphs[g]; |
| 414 | else if (g < 258 + nextras) |
| 415 | sf->glyphsbyindex[i] = extraglyphs[g - 258]; |
| 416 | else |
| 417 | sf->glyphsbyindex[i] = NOGLYPH; |
| 418 | } |
| 419 | sfree(extraglyphs); |
| 420 | break; |
| 421 | default: |
| 422 | abort(); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Get data from 'hhea' and 'hmtx' tables |
| 428 | */ |
| 429 | void sfnt_getmetrics(font_info *fi) { |
| 430 | sfnt *sf = fi->fontfile; |
| 431 | t_hhea hhea; |
| 432 | void *ptr, *end; |
| 433 | unsigned i, j; |
| 434 | unsigned *hmtx; |
| 435 | |
| 436 | if (!sfnt_findtable(sf, TAG_hhea, &ptr, &end)) |
| 437 | abort(); |
| 438 | if (decode(t_hhea_decode, ptr, end, &hhea) == NULL) |
| 439 | abort(); |
| 440 | if ((hhea.version & 0xffff0000) != 0x00010000) |
| 441 | abort(); |
| 442 | fi->ascent = hhea.ascent; |
| 443 | fi->descent = hhea.descent; |
| 444 | if (hhea.metricDataFormat != 0) |
| 445 | abort(); |
| 446 | if (!sfnt_findtable(sf, TAG_hmtx, &ptr, &end)) |
| 447 | abort(); |
| 448 | hmtx = snewn(hhea.numOfLongHorMetrics, unsigned); |
| 449 | if (decoden(longhormetric_decode, ptr, end, hmtx, sizeof(*hmtx), |
| 450 | hhea.numOfLongHorMetrics) == NULL) |
| 451 | abort(); |
| 452 | for (i = 0; i < sf->nglyphs; i++) { |
| 453 | glyph_width *w = snew(glyph_width); |
| 454 | w->glyph = sf->glyphsbyindex[i]; |
| 455 | j = i < hhea.numOfLongHorMetrics ? i : hhea.numOfLongHorMetrics - 1; |
| 456 | w->width = hmtx[j] * UNITS_PER_PT / sf->head.unitsPerEm; |
| 457 | add234(fi->widths, w); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Get mapping data from 'cmap' table |
| 463 | * |
| 464 | * We look for either a (0, 3), or (3, 1) table, both of these being |
| 465 | * versions of UCS-2. We only handle format 4 of this table, since |
| 466 | * that seems to be the only one in use. |
| 467 | */ |
| 468 | void sfnt_getmap(font_info *fi) { |
| 469 | sfnt *sf = fi->fontfile; |
| 470 | t_cmap cmap; |
| 471 | encodingrec *esd; |
| 472 | void *base, *ptr, *end; |
| 473 | unsigned i; |
| 474 | unsigned format; |
| 475 | |
| 476 | |
| 477 | for (i = 0; i < lenof(fi->bmp); i++) |
| 478 | fi->bmp[i] = 0xFFFF; |
| 479 | if (!sfnt_findtable(sf, TAG_cmap, &ptr, &end)) |
| 480 | abort(); |
| 481 | base = ptr; |
| 482 | ptr = decode(t_cmap_decode, ptr, end, &cmap); |
| 483 | if (ptr == NULL) abort(); |
| 484 | esd = snewn(cmap.numTables, encodingrec); |
| 485 | ptr = decoden(encodingrec_decode, ptr, end, esd, sizeof(*esd), |
| 486 | cmap.numTables); |
| 487 | if (ptr == NULL) abort(); |
| 488 | for (i = 0; i < cmap.numTables; i++) { |
| 489 | if (!decode(uint16_decode, (char *)base + esd[i].offset, end, &format)) |
| 490 | abort(); |
| 491 | if ((esd[i].platformID == 0 && esd[i].encodingID == 3) || |
| 492 | (esd[i].platformID == 3 && esd[i].encodingID == 1)) { |
| 493 | /* UCS-2 encoding */ |
| 494 | if (!decode(uint16_decode, (char *)base + esd[i].offset, end, |
| 495 | &format)) |
| 496 | abort(); |
| 497 | if (format == 4) { |
| 498 | unsigned *data, *endCode, *startCode, *idDelta, *idRangeOffset; |
| 499 | unsigned *glyphIndexArray; |
| 500 | unsigned segcount, nword, nglyphindex, j; |
| 501 | cmap4 cmap4; |
| 502 | |
| 503 | ptr = decode(cmap4_decode, (char *)base + esd[i].offset, end, |
| 504 | &cmap4); |
| 505 | if (!ptr) abort(); |
| 506 | segcount = cmap4.segCountX2 / 2; |
| 507 | nword = cmap4.length / 2 - 7; |
| 508 | data = snewn(nword, unsigned); |
| 509 | if (!decoden(uint16_decode, ptr, (char *)ptr + nword * 2, |
| 510 | data, sizeof(*data), nword)) abort(); |
| 511 | endCode = data; |
| 512 | startCode = data + segcount + 1; |
| 513 | idDelta = startCode + segcount; |
| 514 | idRangeOffset = idDelta + segcount; |
| 515 | glyphIndexArray = idRangeOffset + segcount; |
| 516 | nglyphindex = nword - segcount * 4 - 1; |
| 517 | |
| 518 | for (j = 0; j < segcount; j++) { |
| 519 | unsigned k, idx; |
| 520 | |
| 521 | if (idRangeOffset[j] == 0) { |
| 522 | for (k = startCode[j]; k <= endCode[j]; k++) { |
| 523 | idx = (k + idDelta[j]) & 0xffff; |
| 524 | if (idx != 0) { |
| 525 | if (idx > sf->nglyphs) abort(); |
| 526 | fi->bmp[k] = sf->glyphsbyindex[idx]; |
| 527 | } |
| 528 | } |
| 529 | } else { |
| 530 | unsigned startidx = idRangeOffset[j]/2 - segcount + j; |
| 531 | for (k = startCode[j]; k <= endCode[j]; k++) { |
| 532 | idx = glyphIndexArray[startidx + k - startCode[j]]; |
| 533 | if (idx != 0) { |
| 534 | idx = (idx + idDelta[j]) & 0xffff; |
| 535 | if (idx > sf->nglyphs) abort(); |
| 536 | fi->bmp[k] = sf->glyphsbyindex[idx]; |
| 537 | } |
| 538 | } |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | sfree(data); |
| 543 | } |
| 544 | } |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | void read_sfnt_file(input *in) { |
| 549 | sfnt *sf = snew(sfnt); |
| 550 | size_t off = 0, got; |
| 551 | FILE *fp = in->currfp; |
| 552 | font_info *fi = snew(font_info); |
| 553 | /* size_t i; */ |
| 554 | void *ptr, *end; |
| 555 | |
| 556 | fi->name = NULL; |
| 557 | fi->widths = newtree234(width_cmp); |
| 558 | fi->kerns = newtree234(kern_cmp); |
| 559 | fi->ligs = newtree234(lig_cmp); |
| 560 | fi->fontbbox[0] = fi->fontbbox[1] = fi->fontbbox[2] = fi->fontbbox[3] = 0; |
| 561 | fi->capheight = fi->xheight = fi->ascent = fi->descent = 0; |
| 562 | fi->stemh = fi->stemv = fi->italicangle = 0; |
| 563 | fi->fontfile = sf; |
| 564 | fi->filetype = TRUETYPE; |
| 565 | |
| 566 | sf->len = 32768; |
| 567 | sf->data = snewn(sf->len, unsigned char); |
| 568 | for (;;) { |
| 569 | got = fread((char *)sf->data + off, 1, sf->len - off, fp); |
| 570 | off += got; |
| 571 | if (off != sf->len) break; |
| 572 | sf->len *= 2; |
| 573 | sf->data = sresize(sf->data, sf->len, unsigned char); |
| 574 | } |
| 575 | sf->len = off; |
| 576 | sf->data = sresize(sf->data, sf->len, unsigned char); |
| 577 | sf->end = (char *)sf->data + sf->len; |
| 578 | decode(offsubdir_decode, sf->data, sf->end, &sf->osd); |
| 579 | /* |
| 580 | fprintf(stderr, "scaler type = 0x%x; numTables = %u\n", |
| 581 | sf->osd.scaler_type, sf->osd.numTables); |
| 582 | */ |
| 583 | sf->td = snewn(sf->osd.numTables, tabledir); |
| 584 | decoden(tabledir_decode, (char *)sf->data + 12, sf->end, |
| 585 | sf->td, sizeof(*sf->td), sf->osd.numTables); |
| 586 | /* |
| 587 | for (i = 0; i < sf->osd.numTables; i++) |
| 588 | fprintf(stderr, "table tag = '%c%c%c%c'; offset = %#10x; length = %#10x\n", |
| 589 | 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); |
| 590 | */ |
| 591 | if (!sfnt_findtable(sf, TAG_head, &ptr, &end)) |
| 592 | abort(); |
| 593 | if (decode(t_head_decode, ptr, end, &sf->head) == NULL) |
| 594 | abort(); |
| 595 | if ((sf->head.version & 0xffff0000) != 0x00010000) |
| 596 | abort(); |
| 597 | fi->name = sfnt_psname(fi); |
| 598 | sfnt_mapglyphs(sf); |
| 599 | sfnt_getmetrics(fi); |
| 600 | sfnt_getmap(fi); |
| 601 | fi->next = all_fonts; |
| 602 | all_fonts = fi; |
| 603 | fclose(in->currfp); |
| 604 | } |
| 605 | |
| 606 | static int sizecmp(const void *a, const void *b) { |
| 607 | if (*(size_t *)a < *(size_t *)b) return -1; |
| 608 | if (*(size_t *)a > *(size_t *)b) return 1; |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * The format for embedding TrueType fonts in Postscript is defined in |
| 614 | * Adobe Technical Note #5012: The Type 42 Font Format Specification. |
| 615 | * <http://partners.adobe.com/public/developer/en/font/5012.Type42_Spec.pdf> |
| 616 | */ |
| 617 | |
| 618 | void sfnt_writeps(font_info const *fi, FILE *ofp) { |
| 619 | unsigned i, j, lastbreak; |
| 620 | sfnt *sf = fi->fontfile; |
| 621 | size_t *breaks, glyfoff, glyflen; |
| 622 | void *glyfptr, *glyfend, *locaptr, *locaend; |
| 623 | unsigned *loca; |
| 624 | |
| 625 | /* XXX Unclear that this is the correct format. */ |
| 626 | fprintf(ofp, "%%!PS-TrueTypeFont-%u-%u\n", sf->osd.scaler_type, |
| 627 | sf->head.fontRevision); |
| 628 | if (sf->minmem) |
| 629 | fprintf(ofp, "%%%%VMUsage: %u %u\n", sf->minmem, sf->maxmem); |
| 630 | fprintf(ofp, "9 dict dup begin\n"); |
| 631 | fprintf(ofp, "/FontType 42 def\n"); |
| 632 | fprintf(ofp, "/FontMatrix [1 0 0 1 0 0] def\n"); |
| 633 | fprintf(ofp, "/FontName /%s def\n", fi->name); |
| 634 | fprintf(ofp, "/Encoding StandardEncoding def\n"); |
| 635 | if ((sf->head.flags & 0x0003) == 0x0003) { |
| 636 | /* |
| 637 | * Sensible font with the origin in the right place, such that |
| 638 | * the bounding box is meaningful. |
| 639 | */ |
| 640 | fprintf(ofp, "/FontBBox [%g %g %g %g] readonly def\n", |
| 641 | (double)sf->head.xMin / sf->head.unitsPerEm, |
| 642 | (double)sf->head.yMin / sf->head.unitsPerEm, |
| 643 | (double)sf->head.xMax / sf->head.unitsPerEm, |
| 644 | (double)sf->head.yMax / sf->head.unitsPerEm); |
| 645 | } else { |
| 646 | /* Non-sensible font. */ |
| 647 | fprintf(ofp, "/FontBBox [0 0 0 0] readonly def"); |
| 648 | } |
| 649 | fprintf(ofp, "/PaintType 0 def\n"); |
| 650 | fprintf(ofp, "/CharStrings %u dict dup begin\n", sf->nglyphs); |
| 651 | for (i = 0; i < sf->nglyphs; i++) |
| 652 | fprintf(ofp, "/%s %u def\n", glyph_extern(sf->glyphsbyindex[i]), i); |
| 653 | fprintf(ofp, "end readonly def\n"); |
| 654 | fprintf(ofp, "/sfnts [<"); |
| 655 | breaks = snewn(sf->osd.numTables + sf->nglyphs, size_t); |
| 656 | for (i = 0; i < sf->osd.numTables; i++) { |
| 657 | breaks[i] = sf->td[i].offset; |
| 658 | } |
| 659 | if (!sfnt_findtable(sf, TAG_glyf, &glyfptr, &glyfend)) |
| 660 | abort(); |
| 661 | glyfoff = (char *)glyfptr - (char *)sf->data; |
| 662 | glyflen = (char *)glyfend - (char *)glyfptr; |
| 663 | if (!sfnt_findtable(sf, TAG_loca, &locaptr, &locaend)) |
| 664 | abort(); |
| 665 | loca = snewn(sf->nglyphs, unsigned); |
| 666 | if (sf->head.indexToLocFormat == 0) { |
| 667 | if (!decoden(uint16_decode, locaptr, locaend, loca, sizeof(*loca), |
| 668 | sf->nglyphs)) abort(); |
| 669 | for (i = 0; i < sf->nglyphs; i++) loca[i] *= 2; |
| 670 | } else { |
| 671 | if (!decoden(uint32_decode, locaptr, locaend, loca, sizeof(*loca), |
| 672 | sf->nglyphs)) abort(); |
| 673 | } |
| 674 | for (i = 1; i < sf->nglyphs; i++) { |
| 675 | if (loca[i] > glyflen) abort(); |
| 676 | breaks[sf->osd.numTables + i - 1] = loca[i] + glyfoff; |
| 677 | } |
| 678 | breaks[sf->osd.numTables + sf->nglyphs - 1] = sf->len; |
| 679 | qsort(breaks, sf->osd.numTables + sf->nglyphs, sizeof(*breaks), sizecmp); |
| 680 | j = lastbreak = 0; |
| 681 | for (i = 0; i < sf->len; i++) { |
| 682 | if ((i - lastbreak) % 38 == 0) fprintf(ofp, "\n"); |
| 683 | if (i == breaks[j]) { |
| 684 | while (i == breaks[j]) j++; |
| 685 | lastbreak = i; |
| 686 | fprintf(ofp, "00><\n"); |
| 687 | } |
| 688 | fprintf(ofp, "%02x", *((unsigned char *)sf->data + i)); |
| 689 | } |
| 690 | fprintf(ofp, "00>] readonly def\n"); |
| 691 | sfree(breaks); |
| 692 | fprintf(ofp, "end /%s exch definefont\n", fi->name); |
| 693 | } |