1 /***************************************************************************/ 2 /* */ 3 /* cidgload.c */ 4 /* */ 5 /* CID-keyed Type1 Glyph Loader (body). */ 6 /* */ 7 /* Copyright 1996-2018 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #include <ft2build.h> 20 #include "cidload.h" 21 #include "cidgload.h" 22 #include FT_INTERNAL_DEBUG_H 23 #include FT_INTERNAL_STREAM_H 24 #include FT_OUTLINE_H 25 #include FT_INTERNAL_CALC_H 26 27 #include FT_INTERNAL_POSTSCRIPT_AUX_H 28 #include FT_INTERNAL_CFF_TYPES_H 29 #include FT_DRIVER_H 30 31 #include "ciderrs.h" 32 33 34 /*************************************************************************/ 35 /* */ 36 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 37 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 38 /* messages during execution. */ 39 /* */ 40 #undef FT_COMPONENT 41 #define FT_COMPONENT trace_cidgload 42 43 44 FT_CALLBACK_DEF( FT_Error ) 45 cid_load_glyph( T1_Decoder decoder, 46 FT_UInt glyph_index ) 47 { 48 CID_Face face = (CID_Face)decoder->builder.face; 49 CID_FaceInfo cid = &face->cid; 50 FT_Byte* p; 51 FT_ULong fd_select; 52 FT_Stream stream = face->cid_stream; 53 FT_Error error = FT_Err_Ok; 54 FT_Byte* charstring = NULL; 55 FT_Memory memory = face->root.memory; 56 FT_ULong glyph_length = 0; 57 PSAux_Service psaux = (PSAux_Service)face->psaux; 58 59 FT_Bool force_scaling = FALSE; 60 61 #ifdef FT_CONFIG_OPTION_INCREMENTAL 62 FT_Incremental_InterfaceRec *inc = 63 face->root.internal->incremental_interface; 64 #endif 65 66 67 FT_TRACE1(( "cid_load_glyph: glyph index %d\n", glyph_index )); 68 69 #ifdef FT_CONFIG_OPTION_INCREMENTAL 70 71 /* For incremental fonts get the character data using */ 72 /* the callback function. */ 73 if ( inc ) 74 { 75 FT_Data glyph_data; 76 77 78 error = inc->funcs->get_glyph_data( inc->object, 79 glyph_index, &glyph_data ); 80 if ( error ) 81 goto Exit; 82 83 p = (FT_Byte*)glyph_data.pointer; 84 fd_select = cid_get_offset( &p, (FT_Byte)cid->fd_bytes ); 85 86 if ( glyph_data.length != 0 ) 87 { 88 glyph_length = (FT_ULong)( glyph_data.length - cid->fd_bytes ); 89 (void)FT_ALLOC( charstring, glyph_length ); 90 if ( !error ) 91 ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes, 92 glyph_length ); 93 } 94 95 inc->funcs->free_glyph_data( inc->object, &glyph_data ); 96 97 if ( error ) 98 goto Exit; 99 } 100 101 else 102 103 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 104 105 /* For ordinary fonts read the CID font dictionary index */ 106 /* and charstring offset from the CIDMap. */ 107 { 108 FT_UInt entry_len = (FT_UInt)( cid->fd_bytes + cid->gd_bytes ); 109 FT_ULong off1, off2; 110 111 112 if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset + 113 glyph_index * entry_len ) || 114 FT_FRAME_ENTER( 2 * entry_len ) ) 115 goto Exit; 116 117 p = (FT_Byte*)stream->cursor; 118 fd_select = cid_get_offset( &p, (FT_Byte)cid->fd_bytes ); 119 off1 = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ); 120 p += cid->fd_bytes; 121 off2 = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ); 122 FT_FRAME_EXIT(); 123 124 if ( fd_select >= (FT_ULong)cid->num_dicts || 125 off2 > stream->size || 126 off1 > off2 ) 127 { 128 FT_TRACE0(( "cid_load_glyph: invalid glyph stream offsets\n" )); 129 error = FT_THROW( Invalid_Offset ); 130 goto Exit; 131 } 132 133 glyph_length = off2 - off1; 134 if ( glyph_length == 0 ) 135 goto Exit; 136 if ( FT_ALLOC( charstring, glyph_length ) ) 137 goto Exit; 138 if ( FT_STREAM_READ_AT( cid->data_offset + off1, 139 charstring, glyph_length ) ) 140 goto Exit; 141 } 142 143 /* Now set up the subrs array and parse the charstrings. */ 144 { 145 CID_FaceDict dict; 146 CID_Subrs cid_subrs = face->subrs + fd_select; 147 FT_UInt cs_offset; 148 149 150 /* Set up subrs */ 151 decoder->num_subrs = cid_subrs->num_subrs; 152 decoder->subrs = cid_subrs->code; 153 decoder->subrs_len = 0; 154 decoder->subrs_hash = NULL; 155 156 /* Set up font matrix */ 157 dict = cid->font_dicts + fd_select; 158 159 decoder->font_matrix = dict->font_matrix; 160 decoder->font_offset = dict->font_offset; 161 decoder->lenIV = dict->private_dict.lenIV; 162 163 /* Decode the charstring. */ 164 165 /* Adjustment for seed bytes. */ 166 cs_offset = decoder->lenIV >= 0 ? (FT_UInt)decoder->lenIV : 0; 167 if ( cs_offset > glyph_length ) 168 { 169 FT_TRACE0(( "cid_load_glyph: invalid glyph stream offsets\n" )); 170 error = FT_THROW( Invalid_Offset ); 171 goto Exit; 172 } 173 174 /* Decrypt only if lenIV >= 0. */ 175 if ( decoder->lenIV >= 0 ) 176 psaux->t1_decrypt( charstring, glyph_length, 4330 ); 177 178 /* choose which renderer to use */ 179 #ifdef T1_CONFIG_OPTION_OLD_ENGINE 180 if ( ( (PS_Driver)FT_FACE_DRIVER( face ) )->hinting_engine == 181 FT_HINTING_FREETYPE || 182 decoder->builder.metrics_only ) 183 error = psaux->t1_decoder_funcs->parse_charstrings_old( 184 decoder, 185 charstring + cs_offset, 186 glyph_length - cs_offset ); 187 #else 188 if ( decoder->builder.metrics_only ) 189 error = psaux->t1_decoder_funcs->parse_metrics( 190 decoder, 191 charstring + cs_offset, 192 glyph_length - cs_offset ); 193 #endif 194 else 195 { 196 PS_Decoder psdecoder; 197 CFF_SubFontRec subfont; 198 199 200 psaux->ps_decoder_init( &psdecoder, decoder, TRUE ); 201 202 psaux->t1_make_subfont( FT_FACE( face ), 203 &dict->private_dict, 204 &subfont ); 205 psdecoder.current_subfont = &subfont; 206 207 error = psaux->t1_decoder_funcs->parse_charstrings( 208 &psdecoder, 209 charstring + cs_offset, 210 glyph_length - cs_offset ); 211 212 /* Adobe's engine uses 16.16 numbers everywhere; */ 213 /* as a consequence, glyphs larger than 2000ppem get rejected */ 214 if ( FT_ERR_EQ( error, Glyph_Too_Big ) ) 215 { 216 /* this time, we retry unhinted and scale up the glyph later on */ 217 /* (the engine uses and sets the hardcoded value 0x10000 / 64 = */ 218 /* 0x400 for both `x_scale' and `y_scale' in this case) */ 219 ((CID_GlyphSlot)decoder->builder.glyph)->hint = FALSE; 220 221 force_scaling = TRUE; 222 223 error = psaux->t1_decoder_funcs->parse_charstrings( 224 &psdecoder, 225 charstring + cs_offset, 226 glyph_length - cs_offset ); 227 } 228 } 229 } 230 231 #ifdef FT_CONFIG_OPTION_INCREMENTAL 232 233 /* Incremental fonts can optionally override the metrics. */ 234 if ( !error && inc && inc->funcs->get_glyph_metrics ) 235 { 236 FT_Incremental_MetricsRec metrics; 237 238 239 metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x ); 240 metrics.bearing_y = 0; 241 metrics.advance = FIXED_TO_INT( decoder->builder.advance.x ); 242 metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y ); 243 244 error = inc->funcs->get_glyph_metrics( inc->object, 245 glyph_index, FALSE, &metrics ); 246 247 decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x ); 248 decoder->builder.advance.x = INT_TO_FIXED( metrics.advance ); 249 decoder->builder.advance.y = INT_TO_FIXED( metrics.advance_v ); 250 } 251 252 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 253 254 Exit: 255 FT_FREE( charstring ); 256 257 ((CID_GlyphSlot)decoder->builder.glyph)->scaled = force_scaling; 258 259 return error; 260 } 261 262 263 #if 0 264 265 266 /*************************************************************************/ 267 /*************************************************************************/ 268 /*************************************************************************/ 269 /********** *********/ 270 /********** *********/ 271 /********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/ 272 /********** *********/ 273 /********** The following code is in charge of computing *********/ 274 /********** the maximum advance width of the font. It *********/ 275 /********** quickly processes each glyph charstring to *********/ 276 /********** extract the value from either a `sbw' or `seac' *********/ 277 /********** operator. *********/ 278 /********** *********/ 279 /*************************************************************************/ 280 /*************************************************************************/ 281 /*************************************************************************/ 282 283 284 FT_LOCAL_DEF( FT_Error ) 285 cid_face_compute_max_advance( CID_Face face, 286 FT_Int* max_advance ) 287 { 288 FT_Error error; 289 T1_DecoderRec decoder; 290 FT_Int glyph_index; 291 292 PSAux_Service psaux = (PSAux_Service)face->psaux; 293 294 295 *max_advance = 0; 296 297 /* Initialize load decoder */ 298 error = psaux->t1_decoder_funcs->init( &decoder, 299 (FT_Face)face, 300 0, /* size */ 301 0, /* glyph slot */ 302 0, /* glyph names! XXX */ 303 0, /* blend == 0 */ 304 0, /* hinting == 0 */ 305 cid_load_glyph ); 306 if ( error ) 307 return error; 308 309 /* TODO: initialize decoder.len_buildchar and decoder.buildchar */ 310 /* if we ever support CID-keyed multiple master fonts */ 311 312 decoder.builder.metrics_only = 1; 313 decoder.builder.load_points = 0; 314 315 /* for each glyph, parse the glyph charstring and extract */ 316 /* the advance width */ 317 for ( glyph_index = 0; glyph_index < face->root.num_glyphs; 318 glyph_index++ ) 319 { 320 /* now get load the unscaled outline */ 321 error = cid_load_glyph( &decoder, glyph_index ); 322 /* ignore the error if one occurred - skip to next glyph */ 323 } 324 325 *max_advance = FIXED_TO_INT( decoder.builder.advance.x ); 326 327 psaux->t1_decoder_funcs->done( &decoder ); 328 329 return FT_Err_Ok; 330 } 331 332 333 #endif /* 0 */ 334 335 336 FT_LOCAL_DEF( FT_Error ) 337 cid_slot_load_glyph( FT_GlyphSlot cidglyph, /* CID_GlyphSlot */ 338 FT_Size cidsize, /* CID_Size */ 339 FT_UInt glyph_index, 340 FT_Int32 load_flags ) 341 { 342 CID_GlyphSlot glyph = (CID_GlyphSlot)cidglyph; 343 FT_Error error; 344 T1_DecoderRec decoder; 345 CID_Face face = (CID_Face)cidglyph->face; 346 FT_Bool hinting; 347 FT_Bool scaled; 348 349 PSAux_Service psaux = (PSAux_Service)face->psaux; 350 FT_Matrix font_matrix; 351 FT_Vector font_offset; 352 FT_Bool must_finish_decoder = FALSE; 353 354 355 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 356 { 357 error = FT_THROW( Invalid_Argument ); 358 goto Exit; 359 } 360 361 if ( load_flags & FT_LOAD_NO_RECURSE ) 362 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; 363 364 glyph->x_scale = cidsize->metrics.x_scale; 365 glyph->y_scale = cidsize->metrics.y_scale; 366 367 cidglyph->outline.n_points = 0; 368 cidglyph->outline.n_contours = 0; 369 370 hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 && 371 ( load_flags & FT_LOAD_NO_HINTING ) == 0 ); 372 scaled = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 ); 373 374 glyph->hint = hinting; 375 glyph->scaled = scaled; 376 cidglyph->format = FT_GLYPH_FORMAT_OUTLINE; 377 378 error = psaux->t1_decoder_funcs->init( &decoder, 379 cidglyph->face, 380 cidsize, 381 cidglyph, 382 0, /* glyph names -- XXX */ 383 0, /* blend == 0 */ 384 hinting, 385 FT_LOAD_TARGET_MODE( load_flags ), 386 cid_load_glyph ); 387 if ( error ) 388 goto Exit; 389 390 /* TODO: initialize decoder.len_buildchar and decoder.buildchar */ 391 /* if we ever support CID-keyed multiple master fonts */ 392 393 must_finish_decoder = TRUE; 394 395 /* set up the decoder */ 396 decoder.builder.no_recurse = FT_BOOL( 397 ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) ); 398 399 error = cid_load_glyph( &decoder, glyph_index ); 400 if ( error ) 401 goto Exit; 402 403 /* copy flags back for forced scaling */ 404 hinting = glyph->hint; 405 scaled = glyph->scaled; 406 407 font_matrix = decoder.font_matrix; 408 font_offset = decoder.font_offset; 409 410 /* save new glyph tables */ 411 psaux->t1_decoder_funcs->done( &decoder ); 412 413 must_finish_decoder = FALSE; 414 415 /* now set the metrics -- this is rather simple, as */ 416 /* the left side bearing is the xMin, and the top side */ 417 /* bearing the yMax */ 418 cidglyph->outline.flags &= FT_OUTLINE_OWNER; 419 cidglyph->outline.flags |= FT_OUTLINE_REVERSE_FILL; 420 421 /* for composite glyphs, return only left side bearing and */ 422 /* advance width */ 423 if ( load_flags & FT_LOAD_NO_RECURSE ) 424 { 425 FT_Slot_Internal internal = cidglyph->internal; 426 427 428 cidglyph->metrics.horiBearingX = 429 FIXED_TO_INT( decoder.builder.left_bearing.x ); 430 cidglyph->metrics.horiAdvance = 431 FIXED_TO_INT( decoder.builder.advance.x ); 432 433 internal->glyph_matrix = font_matrix; 434 internal->glyph_delta = font_offset; 435 internal->glyph_transformed = 1; 436 } 437 else 438 { 439 FT_BBox cbox; 440 FT_Glyph_Metrics* metrics = &cidglyph->metrics; 441 442 443 /* copy the _unscaled_ advance width */ 444 metrics->horiAdvance = 445 FIXED_TO_INT( decoder.builder.advance.x ); 446 cidglyph->linearHoriAdvance = 447 FIXED_TO_INT( decoder.builder.advance.x ); 448 cidglyph->internal->glyph_transformed = 0; 449 450 /* make up vertical ones */ 451 metrics->vertAdvance = ( face->cid.font_bbox.yMax - 452 face->cid.font_bbox.yMin ) >> 16; 453 cidglyph->linearVertAdvance = metrics->vertAdvance; 454 455 cidglyph->format = FT_GLYPH_FORMAT_OUTLINE; 456 457 if ( cidsize->metrics.y_ppem < 24 ) 458 cidglyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 459 460 /* apply the font matrix, if any */ 461 if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L || 462 font_matrix.xy != 0 || font_matrix.yx != 0 ) 463 { 464 FT_Outline_Transform( &cidglyph->outline, &font_matrix ); 465 466 metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, 467 font_matrix.xx ); 468 metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, 469 font_matrix.yy ); 470 } 471 472 if ( font_offset.x || font_offset.y ) 473 { 474 FT_Outline_Translate( &cidglyph->outline, 475 font_offset.x, 476 font_offset.y ); 477 478 metrics->horiAdvance += font_offset.x; 479 metrics->vertAdvance += font_offset.y; 480 } 481 482 if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || scaled ) 483 { 484 /* scale the outline and the metrics */ 485 FT_Int n; 486 FT_Outline* cur = decoder.builder.base; 487 FT_Vector* vec = cur->points; 488 FT_Fixed x_scale = glyph->x_scale; 489 FT_Fixed y_scale = glyph->y_scale; 490 491 492 /* First of all, scale the points */ 493 if ( !hinting || !decoder.builder.hints_funcs ) 494 for ( n = cur->n_points; n > 0; n--, vec++ ) 495 { 496 vec->x = FT_MulFix( vec->x, x_scale ); 497 vec->y = FT_MulFix( vec->y, y_scale ); 498 } 499 500 /* Then scale the metrics */ 501 metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); 502 metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); 503 } 504 505 /* compute the other metrics */ 506 FT_Outline_Get_CBox( &cidglyph->outline, &cbox ); 507 508 metrics->width = cbox.xMax - cbox.xMin; 509 metrics->height = cbox.yMax - cbox.yMin; 510 511 metrics->horiBearingX = cbox.xMin; 512 metrics->horiBearingY = cbox.yMax; 513 514 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 515 { 516 /* make up vertical ones */ 517 ft_synthesize_vertical_metrics( metrics, 518 metrics->vertAdvance ); 519 } 520 } 521 522 Exit: 523 524 if ( must_finish_decoder ) 525 psaux->t1_decoder_funcs->done( &decoder ); 526 527 return error; 528 } 529 530 531 /* END */ 532
