1 /***************************************************************************/ 2 /* */ 3 /* t1gload.c */ 4 /* */ 5 /* Type 1 Glyph Loader (body). */ 6 /* */ 7 /* Copyright 1996-2017 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 "t1gload.h" 21 #include FT_INTERNAL_CALC_H 22 #include FT_INTERNAL_DEBUG_H 23 #include FT_INTERNAL_STREAM_H 24 #include FT_OUTLINE_H 25 #include FT_INTERNAL_POSTSCRIPT_AUX_H 26 27 #include "t1errors.h" 28 29 30 /*************************************************************************/ 31 /* */ 32 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 33 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 34 /* messages during execution. */ 35 /* */ 36 #undef FT_COMPONENT 37 #define FT_COMPONENT trace_t1gload 38 39 40 /*************************************************************************/ 41 /*************************************************************************/ 42 /*************************************************************************/ 43 /********** *********/ 44 /********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/ 45 /********** *********/ 46 /********** The following code is in charge of computing *********/ 47 /********** the maximum advance width of the font. It *********/ 48 /********** quickly processes each glyph charstring to *********/ 49 /********** extract the value from either a `sbw' or `seac' *********/ 50 /********** operator. *********/ 51 /********** *********/ 52 /*************************************************************************/ 53 /*************************************************************************/ 54 /*************************************************************************/ 55 56 57 static FT_Error T1_Parse_Glyph_And_Get_Char_String(T1_Decoder decoder,FT_UInt glyph_index,FT_Data * char_string)58 T1_Parse_Glyph_And_Get_Char_String( T1_Decoder decoder, 59 FT_UInt glyph_index, 60 FT_Data* char_string ) 61 { 62 T1_Face face = (T1_Face)decoder->builder.face; 63 T1_Font type1 = &face->type1; 64 FT_Error error = FT_Err_Ok; 65 66 #ifdef FT_CONFIG_OPTION_INCREMENTAL 67 FT_Incremental_InterfaceRec *inc = 68 face->root.internal->incremental_interface; 69 #endif 70 71 72 decoder->font_matrix = type1->font_matrix; 73 decoder->font_offset = type1->font_offset; 74 75 #ifdef FT_CONFIG_OPTION_INCREMENTAL 76 77 /* For incremental fonts get the character data using the */ 78 /* callback function. */ 79 if ( inc ) 80 error = inc->funcs->get_glyph_data( inc->object, 81 glyph_index, char_string ); 82 else 83 84 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 85 86 /* For ordinary fonts get the character data stored in the face record. */ 87 { 88 char_string->pointer = type1->charstrings[glyph_index]; 89 char_string->length = (FT_Int)type1->charstrings_len[glyph_index]; 90 } 91 92 if ( !error ) 93 error = decoder->funcs.parse_charstrings( 94 decoder, (FT_Byte*)char_string->pointer, 95 (FT_UInt)char_string->length ); 96 97 #ifdef FT_CONFIG_OPTION_INCREMENTAL 98 99 /* Incremental fonts can optionally override the metrics. */ 100 if ( !error && inc && inc->funcs->get_glyph_metrics ) 101 { 102 FT_Incremental_MetricsRec metrics; 103 104 105 metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x ); 106 metrics.bearing_y = 0; 107 metrics.advance = FIXED_TO_INT( decoder->builder.advance.x ); 108 metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y ); 109 110 error = inc->funcs->get_glyph_metrics( inc->object, 111 glyph_index, FALSE, &metrics ); 112 113 decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x ); 114 decoder->builder.advance.x = INT_TO_FIXED( metrics.advance ); 115 decoder->builder.advance.y = INT_TO_FIXED( metrics.advance_v ); 116 } 117 118 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 119 120 return error; 121 } 122 123 124 FT_CALLBACK_DEF( FT_Error ) T1_Parse_Glyph(T1_Decoder decoder,FT_UInt glyph_index)125 T1_Parse_Glyph( T1_Decoder decoder, 126 FT_UInt glyph_index ) 127 { 128 FT_Data glyph_data; 129 FT_Error error = T1_Parse_Glyph_And_Get_Char_String( 130 decoder, glyph_index, &glyph_data ); 131 132 133 #ifdef FT_CONFIG_OPTION_INCREMENTAL 134 135 if ( !error ) 136 { 137 T1_Face face = (T1_Face)decoder->builder.face; 138 139 140 if ( face->root.internal->incremental_interface ) 141 face->root.internal->incremental_interface->funcs->free_glyph_data( 142 face->root.internal->incremental_interface->object, 143 &glyph_data ); 144 } 145 146 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 147 148 return error; 149 } 150 151 152 FT_LOCAL_DEF( FT_Error ) T1_Compute_Max_Advance(T1_Face face,FT_Pos * max_advance)153 T1_Compute_Max_Advance( T1_Face face, 154 FT_Pos* max_advance ) 155 { 156 FT_Error error; 157 T1_DecoderRec decoder; 158 FT_Int glyph_index; 159 T1_Font type1 = &face->type1; 160 PSAux_Service psaux = (PSAux_Service)face->psaux; 161 162 163 FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) ); 164 165 *max_advance = 0; 166 167 /* initialize load decoder */ 168 error = psaux->t1_decoder_funcs->init( &decoder, 169 (FT_Face)face, 170 0, /* size */ 171 0, /* glyph slot */ 172 (FT_Byte**)type1->glyph_names, 173 face->blend, 174 0, 175 FT_RENDER_MODE_NORMAL, 176 T1_Parse_Glyph ); 177 if ( error ) 178 return error; 179 180 decoder.builder.metrics_only = 1; 181 decoder.builder.load_points = 0; 182 183 decoder.num_subrs = type1->num_subrs; 184 decoder.subrs = type1->subrs; 185 decoder.subrs_len = type1->subrs_len; 186 decoder.subrs_hash = type1->subrs_hash; 187 188 decoder.buildchar = face->buildchar; 189 decoder.len_buildchar = face->len_buildchar; 190 191 *max_advance = 0; 192 193 /* for each glyph, parse the glyph charstring and extract */ 194 /* the advance width */ 195 for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ ) 196 { 197 /* now get load the unscaled outline */ 198 (void)T1_Parse_Glyph( &decoder, (FT_UInt)glyph_index ); 199 if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance ) 200 *max_advance = decoder.builder.advance.x; 201 202 /* ignore the error if one occurred - skip to next glyph */ 203 } 204 205 psaux->t1_decoder_funcs->done( &decoder ); 206 207 return FT_Err_Ok; 208 } 209 210 211 FT_LOCAL_DEF( FT_Error ) T1_Get_Advances(FT_Face t1face,FT_UInt first,FT_UInt count,FT_Int32 load_flags,FT_Fixed * advances)212 T1_Get_Advances( FT_Face t1face, /* T1_Face */ 213 FT_UInt first, 214 FT_UInt count, 215 FT_Int32 load_flags, 216 FT_Fixed* advances ) 217 { 218 T1_Face face = (T1_Face)t1face; 219 T1_DecoderRec decoder; 220 T1_Font type1 = &face->type1; 221 PSAux_Service psaux = (PSAux_Service)face->psaux; 222 FT_UInt nn; 223 FT_Error error; 224 225 226 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 227 { 228 for ( nn = 0; nn < count; nn++ ) 229 advances[nn] = 0; 230 231 return FT_Err_Ok; 232 } 233 234 error = psaux->t1_decoder_funcs->init( &decoder, 235 (FT_Face)face, 236 0, /* size */ 237 0, /* glyph slot */ 238 (FT_Byte**)type1->glyph_names, 239 face->blend, 240 0, 241 FT_RENDER_MODE_NORMAL, 242 T1_Parse_Glyph ); 243 if ( error ) 244 return error; 245 246 decoder.builder.metrics_only = 1; 247 decoder.builder.load_points = 0; 248 249 decoder.num_subrs = type1->num_subrs; 250 decoder.subrs = type1->subrs; 251 decoder.subrs_len = type1->subrs_len; 252 decoder.subrs_hash = type1->subrs_hash; 253 254 decoder.buildchar = face->buildchar; 255 decoder.len_buildchar = face->len_buildchar; 256 257 for ( nn = 0; nn < count; nn++ ) 258 { 259 error = T1_Parse_Glyph( &decoder, first + nn ); 260 if ( !error ) 261 advances[nn] = FIXED_TO_INT( decoder.builder.advance.x ); 262 else 263 advances[nn] = 0; 264 } 265 266 return FT_Err_Ok; 267 } 268 269 270 FT_LOCAL_DEF( FT_Error ) T1_Load_Glyph(FT_GlyphSlot t1glyph,FT_Size t1size,FT_UInt glyph_index,FT_Int32 load_flags)271 T1_Load_Glyph( FT_GlyphSlot t1glyph, /* T1_GlyphSlot */ 272 FT_Size t1size, /* T1_Size */ 273 FT_UInt glyph_index, 274 FT_Int32 load_flags ) 275 { 276 T1_GlyphSlot glyph = (T1_GlyphSlot)t1glyph; 277 FT_Error error; 278 T1_DecoderRec decoder; 279 T1_Face face = (T1_Face)t1glyph->face; 280 FT_Bool hinting; 281 T1_Font type1 = &face->type1; 282 PSAux_Service psaux = (PSAux_Service)face->psaux; 283 const T1_Decoder_Funcs decoder_funcs = psaux->t1_decoder_funcs; 284 285 FT_Matrix font_matrix; 286 FT_Vector font_offset; 287 FT_Data glyph_data; 288 FT_Bool must_finish_decoder = FALSE; 289 #ifdef FT_CONFIG_OPTION_INCREMENTAL 290 FT_Bool glyph_data_loaded = 0; 291 #endif 292 293 294 #ifdef FT_CONFIG_OPTION_INCREMENTAL 295 if ( glyph_index >= (FT_UInt)face->root.num_glyphs && 296 !face->root.internal->incremental_interface ) 297 #else 298 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 299 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 300 { 301 error = FT_THROW( Invalid_Argument ); 302 goto Exit; 303 } 304 305 FT_TRACE1(( "T1_Load_Glyph: glyph index %d\n", glyph_index )); 306 307 FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) ); 308 309 if ( load_flags & FT_LOAD_NO_RECURSE ) 310 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; 311 312 if ( t1size ) 313 { 314 glyph->x_scale = t1size->metrics.x_scale; 315 glyph->y_scale = t1size->metrics.y_scale; 316 } 317 else 318 { 319 glyph->x_scale = 0x10000L; 320 glyph->y_scale = 0x10000L; 321 } 322 323 t1glyph->outline.n_points = 0; 324 t1glyph->outline.n_contours = 0; 325 326 hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 && 327 ( load_flags & FT_LOAD_NO_HINTING ) == 0 ); 328 329 t1glyph->format = FT_GLYPH_FORMAT_OUTLINE; 330 331 error = decoder_funcs->init( &decoder, 332 t1glyph->face, 333 t1size, 334 t1glyph, 335 (FT_Byte**)type1->glyph_names, 336 face->blend, 337 FT_BOOL( hinting ), 338 FT_LOAD_TARGET_MODE( load_flags ), 339 T1_Parse_Glyph ); 340 if ( error ) 341 goto Exit; 342 343 must_finish_decoder = TRUE; 344 345 decoder.builder.no_recurse = FT_BOOL( 346 ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ); 347 348 decoder.num_subrs = type1->num_subrs; 349 decoder.subrs = type1->subrs; 350 decoder.subrs_len = type1->subrs_len; 351 decoder.subrs_hash = type1->subrs_hash; 352 353 decoder.buildchar = face->buildchar; 354 decoder.len_buildchar = face->len_buildchar; 355 356 /* now load the unscaled outline */ 357 error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index, 358 &glyph_data ); 359 if ( error ) 360 goto Exit; 361 #ifdef FT_CONFIG_OPTION_INCREMENTAL 362 glyph_data_loaded = 1; 363 #endif 364 365 font_matrix = decoder.font_matrix; 366 font_offset = decoder.font_offset; 367 368 /* save new glyph tables */ 369 decoder_funcs->done( &decoder ); 370 371 must_finish_decoder = FALSE; 372 373 /* now, set the metrics -- this is rather simple, as */ 374 /* the left side bearing is the xMin, and the top side */ 375 /* bearing the yMax */ 376 if ( !error ) 377 { 378 t1glyph->outline.flags &= FT_OUTLINE_OWNER; 379 t1glyph->outline.flags |= FT_OUTLINE_REVERSE_FILL; 380 381 /* for composite glyphs, return only left side bearing and */ 382 /* advance width */ 383 if ( load_flags & FT_LOAD_NO_RECURSE ) 384 { 385 FT_Slot_Internal internal = t1glyph->internal; 386 387 388 t1glyph->metrics.horiBearingX = 389 FIXED_TO_INT( decoder.builder.left_bearing.x ); 390 t1glyph->metrics.horiAdvance = 391 FIXED_TO_INT( decoder.builder.advance.x ); 392 393 internal->glyph_matrix = font_matrix; 394 internal->glyph_delta = font_offset; 395 internal->glyph_transformed = 1; 396 } 397 else 398 { 399 FT_BBox cbox; 400 FT_Glyph_Metrics* metrics = &t1glyph->metrics; 401 402 403 /* copy the _unscaled_ advance width */ 404 metrics->horiAdvance = 405 FIXED_TO_INT( decoder.builder.advance.x ); 406 t1glyph->linearHoriAdvance = 407 FIXED_TO_INT( decoder.builder.advance.x ); 408 t1glyph->internal->glyph_transformed = 0; 409 410 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 411 { 412 /* make up vertical ones */ 413 metrics->vertAdvance = ( face->type1.font_bbox.yMax - 414 face->type1.font_bbox.yMin ) >> 16; 415 t1glyph->linearVertAdvance = metrics->vertAdvance; 416 } 417 else 418 { 419 metrics->vertAdvance = 420 FIXED_TO_INT( decoder.builder.advance.y ); 421 t1glyph->linearVertAdvance = 422 FIXED_TO_INT( decoder.builder.advance.y ); 423 } 424 425 t1glyph->format = FT_GLYPH_FORMAT_OUTLINE; 426 427 if ( t1size && t1size->metrics.y_ppem < 24 ) 428 t1glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 429 430 #if 1 431 /* apply the font matrix, if any */ 432 if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L || 433 font_matrix.xy != 0 || font_matrix.yx != 0 ) 434 { 435 FT_Outline_Transform( &t1glyph->outline, &font_matrix ); 436 437 metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, 438 font_matrix.xx ); 439 metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, 440 font_matrix.yy ); 441 } 442 443 if ( font_offset.x || font_offset.y ) 444 { 445 FT_Outline_Translate( &t1glyph->outline, 446 font_offset.x, 447 font_offset.y ); 448 449 metrics->horiAdvance += font_offset.x; 450 metrics->vertAdvance += font_offset.y; 451 } 452 #endif 453 454 if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 ) 455 { 456 /* scale the outline and the metrics */ 457 FT_Int n; 458 FT_Outline* cur = decoder.builder.base; 459 FT_Vector* vec = cur->points; 460 FT_Fixed x_scale = glyph->x_scale; 461 FT_Fixed y_scale = glyph->y_scale; 462 463 464 /* First of all, scale the points, if we are not hinting */ 465 if ( !hinting || ! decoder.builder.hints_funcs ) 466 for ( n = cur->n_points; n > 0; n--, vec++ ) 467 { 468 vec->x = FT_MulFix( vec->x, x_scale ); 469 vec->y = FT_MulFix( vec->y, y_scale ); 470 } 471 472 /* Then scale the metrics */ 473 metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); 474 metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); 475 } 476 477 /* compute the other metrics */ 478 FT_Outline_Get_CBox( &t1glyph->outline, &cbox ); 479 480 metrics->width = cbox.xMax - cbox.xMin; 481 metrics->height = cbox.yMax - cbox.yMin; 482 483 metrics->horiBearingX = cbox.xMin; 484 metrics->horiBearingY = cbox.yMax; 485 486 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 487 { 488 /* make up vertical ones */ 489 ft_synthesize_vertical_metrics( metrics, 490 metrics->vertAdvance ); 491 } 492 } 493 494 /* Set control data to the glyph charstrings. Note that this is */ 495 /* _not_ zero-terminated. */ 496 t1glyph->control_data = (FT_Byte*)glyph_data.pointer; 497 t1glyph->control_len = glyph_data.length; 498 } 499 500 501 Exit: 502 503 #ifdef FT_CONFIG_OPTION_INCREMENTAL 504 if ( glyph_data_loaded && face->root.internal->incremental_interface ) 505 { 506 face->root.internal->incremental_interface->funcs->free_glyph_data( 507 face->root.internal->incremental_interface->object, 508 &glyph_data ); 509 510 /* Set the control data to null - it is no longer available if */ 511 /* loaded incrementally. */ 512 t1glyph->control_data = NULL; 513 t1glyph->control_len = 0; 514 } 515 #endif 516 517 if ( must_finish_decoder ) 518 decoder_funcs->done( &decoder ); 519 520 return error; 521 } 522 523 524 /* END */ 525